terminal.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <ctype.h>
   4
   5 #include <time.h>
   6 #include <assert.h>
   7 #include "putty.h"
   8 #include "terminal.h"
   9
  10 #define poslt(p1,p2) ( (p1).y < (p2).y || ( (p1).y == (p2).y && (p1).x < (p2).x ) )
  11 #define posle(p1,p2) ( (p1).y < (p2).y || ( (p1).y == (p2).y && (p1).x <= (p2).x ) )
  12 #define poseq(p1,p2) ( (p1).y == (p2).y && (p1).x == (p2).x )
  13 #define posdiff(p1,p2) ( ((p1).y - (p2).y) * (term->cols+1) + (p1).x - (p2).x )
  14
  15 /* Product-order comparisons for rectangular block selection. */
  16 #define posPlt(p1,p2) ( (p1).y <= (p2).y && (p1).x < (p2).x )
  17 #define posPle(p1,p2) ( (p1).y <= (p2).y && (p1).x <= (p2).x )
  18
  19 #define incpos(p) ( (p).x == term->cols ? ((p).x = 0, (p).y++, 1) : ((p).x++, 0) )
  20 #define decpos(p) ( (p).x == 0 ? ((p).x = term->cols, (p).y--, 1) : ((p).x--, 0) )
  21
  22 #define VT52_PLUS
  23
  24 #define CL_ANSIMIN      0x0001         /* Codes in all ANSI like terminals. */
  25 #define CL_VT100        0x0002         /* VT100 */
  26 #define CL_VT100AVO     0x0004         /* VT100 +AVO; 132x24 (not 132x14) & attrs */
  27 #define CL_VT102        0x0008         /* VT102 */
  28 #define CL_VT220        0x0010         /* VT220 */
  29 #define CL_VT320        0x0020         /* VT320 */
  30 #define CL_VT420        0x0040         /* VT420 */
  31 #define CL_VT510        0x0080         /* VT510, NB VT510 includes ANSI */
  32 #define CL_VT340TEXT    0x0100         /* VT340 extensions that appear in the VT420 */
  33 #define CL_SCOANSI      0x1000         /* SCOANSI not in ANSIMIN. */
  34 #define CL_ANSI         0x2000         /* ANSI ECMA-48 not in the VT100..VT420 */
  35 #define CL_OTHER        0x4000         /* Others, Xterm, linux, putty, dunno, etc */
  36
  37 #define TM_VT100        (CL_ANSIMIN|CL_VT100)
  38 #define TM_VT100AVO     (TM_VT100|CL_VT100AVO)
  39 #define TM_VT102        (TM_VT100AVO|CL_VT102)
  40 #define TM_VT220        (TM_VT102|CL_VT220)
  41 #define TM_VTXXX        (TM_VT220|CL_VT340TEXT|CL_VT510|CL_VT420|CL_VT320)
  42 #define TM_SCOANSI      (CL_ANSIMIN|CL_SCOANSI)
  43
  44 #define TM_PUTTY        (0xFFFF)
  45
  46 #define compatibility(x) \
  47     if ( ((CL_##x)&term->compatibility_level) == 0 ) {  \
  48        term->termstate=TOPLEVEL;                        \
  49        break;                                           \
  50     }
  51 #define compatibility2(x,y) \
  52     if ( ((CL_##x|CL_##y)&term->compatibility_level) == 0 ) { \
  53        term->termstate=TOPLEVEL;                        \
  54        break;                                           \
  55     }
  56
  57 #define has_compat(x) ( ((CL_##x)&term->compatibility_level) != 0 )
  58
  59 const char sco2ansicolour[] = { 0, 4, 2, 6, 1, 5, 3, 7 };
  60
  61 #define sel_nl_sz  (sizeof(sel_nl)/sizeof(wchar_t))
  62 const wchar_t sel_nl[] = SEL_NL;
  63
  64 /*
  65  * Fetch the character at a particular position in a line array,
  66  * for purposes of `wordtype'. The reason this isn't just a simple
  67  * array reference is that if the character we find is UCSWIDE,
  68  * then we must look one space further to the left.
  69  */
  70 #define UCSGET(a, x) \
  71     ( (x)>0 && ((a)[(x)] & (CHAR_MASK | CSET_MASK)) == UCSWIDE ? \
  72         (a)[(x)-1] : (a)[(x)] )
  73
  74 /*
  75  * Internal prototypes.
  76  */
  77 static unsigned long *resizeline(unsigned long *, int);
  78 static unsigned long *lineptr(Terminal *, int, int);
  79 static void do_paint(Terminal *, Context, int);
  80 static void erase_lots(Terminal *, int, int, int);
  81 static void swap_screen(Terminal *, int, int, int);
  82 static void update_sbar(Terminal *);
  83 static void deselect(Terminal *);
  84 static void term_print_finish(Terminal *);
  85 #ifdef OPTIMISE_SCROLL
  86 static void scroll_display(Terminal *, int, int, int);
  87 #endif /* OPTIMISE_SCROLL */
  88
  89 /*
  90  * Resize a line to make it `cols' columns wide.
  91  */
  92 static unsigned long *resizeline(unsigned long *line, int cols)
  93 {
  94     int i, oldlen;
  95     unsigned long lineattrs;
  96
  97     if (line[0] != (unsigned long)cols) {
  98         /*
  99          * This line is the wrong length, which probably means it
 100          * hasn't been accessed since a resize. Resize it now.
 101          */
 102         oldlen = line[0];
 103         lineattrs = line[oldlen + 1];
 104         line = sresize(line, 2 + cols, TTYPE);
 105         line[0] = cols;
 106         for (i = oldlen; i < cols; i++)
 107             line[i + 1] = ERASE_CHAR;
 108         line[cols + 1] = lineattrs & LATTR_MODE;
 109     }
 110
 111     return line;
 112 }
 113
 114 /*
 115  * Get the number of lines in the scrollback.
 116  */
 117 static int sblines(Terminal *term)
 118 {
 119     int sblines = count234(term->scrollback);
 120     if (term->cfg.erase_to_scrollback &&
 121         term->alt_which && term->alt_screen) {
 122             sblines += term->alt_sblines;
 123     }
 124     return sblines;
 125 }
 126
 127 /*
 128  * Retrieve a line of the screen or of the scrollback, according to
 129  * whether the y coordinate is non-negative or negative
 130  * (respectively).
 131  */
 132 static unsigned long *lineptr(Terminal *term, int y, int lineno)
 133 {
 134     unsigned long *line, *newline;
 135     tree234 *whichtree;
 136     int treeindex;
 137
 138     if (y >= 0) {
 139         whichtree = term->screen;
 140         treeindex = y;
 141     } else {
 142         int altlines = 0;
 143         if (term->cfg.erase_to_scrollback &&
 144             term->alt_which && term->alt_screen) {
 145             altlines = term->alt_sblines;
 146         }
 147         if (y < -altlines) {
 148             whichtree = term->scrollback;
 149             treeindex = y + altlines + count234(term->scrollback);
 150         } else {
 151             whichtree = term->alt_screen;
 152             treeindex = y + term->alt_sblines;
 153             /* treeindex = y + count234(term->alt_screen); */
 154         }
 155     }
 156     line = index234(whichtree, treeindex);
 157
 158     /* We assume that we don't screw up and retrieve something out of range. */
 159     assert(line != NULL);
 160
 161     newline = resizeline(line, term->cols);
 162     if (newline != line) {
 163         delpos234(whichtree, treeindex);
 164         addpos234(whichtree, newline, treeindex);
 165         line = newline;
 166     }
 167
 168     return line + 1;
 169 }
 170
 171 #define lineptr(x) lineptr(term,x,__LINE__)
 172
 173 /*
 174  * Set up power-on settings for the terminal.
 175  */
 176 static void power_on(Terminal *term)
 177 {
 178     term->curs.x = term->curs.y = 0;
 179     term->alt_x = term->alt_y = 0;
 180     term->savecurs.x = term->savecurs.y = 0;
 181     term->alt_t = term->marg_t = 0;
 182     if (term->rows != -1)
 183         term->alt_b = term->marg_b = term->rows - 1;
 184     else
 185         term->alt_b = term->marg_b = 0;
 186     if (term->cols != -1) {
 187         int i;
 188         for (i = 0; i < term->cols; i++)
 189             term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
 190     }
 191     term->alt_om = term->dec_om = term->cfg.dec_om;
 192     term->alt_ins = term->insert = FALSE;
 193     term->alt_wnext = term->wrapnext = term->save_wnext = FALSE;
 194     term->alt_wrap = term->wrap = term->cfg.wrap_mode;
 195     term->alt_cset = term->cset = term->save_cset = 0;
 196     term->alt_utf = term->utf = term->save_utf = 0;
 197     term->utf_state = 0;
 198     term->alt_sco_acs = term->sco_acs = term->save_sco_acs = 0;
 199     term->cset_attr[0] = term->cset_attr[1] = term->save_csattr = ATTR_ASCII;
 200     term->rvideo = 0;
 201     term->in_vbell = FALSE;
 202     term->cursor_on = 1;
 203     term->big_cursor = 0;
 204     term->default_attr = term->save_attr = term->curr_attr = ATTR_DEFAULT;
 205     term->term_editing = term->term_echoing = FALSE;
 206     term->app_cursor_keys = term->cfg.app_cursor;
 207     term->app_keypad_keys = term->cfg.app_keypad;
 208     term->use_bce = term->cfg.bce;
 209     term->blink_is_real = term->cfg.blinktext;
 210     term->erase_char = ERASE_CHAR;
 211     term->alt_which = 0;
 212     term_print_finish(term);
 213     {
 214         int i;
 215         for (i = 0; i < 256; i++)
 216             term->wordness[i] = term->cfg.wordness[i];
 217     }
 218     if (term->screen) {
 219         swap_screen(term, 1, FALSE, FALSE);
 220         erase_lots(term, FALSE, TRUE, TRUE);
 221         swap_screen(term, 0, FALSE, FALSE);
 222         erase_lots(term, FALSE, TRUE, TRUE);
 223     }
 224 }
 225
 226 /*
 227  * Force a screen update.
 228  */
 229 void term_update(Terminal *term)
 230 {
 231     Context ctx;
 232     ctx = get_ctx(term->frontend);
 233     if (ctx) {
 234         int need_sbar_update = term->seen_disp_event;
 235         if (term->seen_disp_event && term->cfg.scroll_on_disp) {
 236             term->disptop = 0;         /* return to main screen */
 237             term->seen_disp_event = 0;
 238             need_sbar_update = TRUE;
 239         }
 240         if (need_sbar_update)
 241             update_sbar(term);
 242         do_paint(term, ctx, TRUE);
 243         sys_cursor(term->frontend, term->curs.x, term->curs.y - term->disptop);
 244         free_ctx(ctx);
 245     }
 246 }
 247
 248 /*
 249  * Called from front end when a keypress occurs, to trigger
 250  * anything magical that needs to happen in that situation.
 251  */
 252 void term_seen_key_event(Terminal *term)
 253 {
 254     /*
 255      * On any keypress, clear the bell overload mechanism
 256      * completely, on the grounds that large numbers of
 257      * beeps coming from deliberate key action are likely
 258      * to be intended (e.g. beeps from filename completion
 259      * blocking repeatedly).
 260      */
 261     term->beep_overloaded = FALSE;
 262     while (term->beephead) {
 263         struct beeptime *tmp = term->beephead;
 264         term->beephead = tmp->next;
 265         sfree(tmp);
 266     }
 267     term->beeptail = NULL;
 268     term->nbeeps = 0;
 269
 270     /*
 271      * Reset the scrollback on keypress, if we're doing that.
 272      */
 273     if (term->cfg.scroll_on_key) {
 274         term->disptop = 0;             /* return to main screen */
 275         term->seen_disp_event = 1;
 276     }
 277 }
 278
 279 /*
 280  * Same as power_on(), but an external function.
 281  */
 282 void term_pwron(Terminal *term)
 283 {
 284     power_on(term);
 285     if (term->ldisc)                   /* cause ldisc to notice changes */
 286         ldisc_send(term->ldisc, NULL, 0, 0);
 287     fix_cpos;
 288     term->disptop = 0;
 289     deselect(term);
 290     term_update(term);
 291 }
 292
 293 /*
 294  * When the user reconfigures us, we need to check the forbidden-
 295  * alternate-screen config option, disable raw mouse mode if the
 296  * user has disabled mouse reporting, and abandon a print job if
 297  * the user has disabled printing.
 298  */
 299 void term_reconfig(Terminal *term, Config *cfg)
 300 {
 301     /*
 302      * Before adopting the new config, check all those terminal
 303      * settings which control power-on defaults; and if they've
 304      * changed, we will modify the current state as well as the
 305      * default one. The full list is: Auto wrap mode, DEC Origin
 306      * Mode, BCE, blinking text, character classes.
 307      */
 308     int reset_wrap, reset_decom, reset_bce, reset_blink, reset_charclass;
 309     int i;
 310
 311     reset_wrap = (term->cfg.wrap_mode != cfg->wrap_mode);
 312     reset_decom = (term->cfg.dec_om != cfg->dec_om);
 313     reset_bce = (term->cfg.bce != cfg->bce);
 314     reset_blink = (term->cfg.blinktext != cfg->blinktext);
 315     reset_charclass = 0;
 316     for (i = 0; i < lenof(term->cfg.wordness); i++)
 317         if (term->cfg.wordness[i] != cfg->wordness[i])
 318             reset_charclass = 1;
 319
 320     term->cfg = *cfg;                  /* STRUCTURE COPY */
 321
 322     if (reset_wrap)
 323         term->alt_wrap = term->wrap = term->cfg.wrap_mode;
 324     if (reset_decom)
 325         term->alt_om = term->dec_om = term->cfg.dec_om;
 326     if (reset_bce) {
 327         term->use_bce = term->cfg.bce;
 328         if (term->use_bce)
 329             term->erase_char = (' ' | ATTR_ASCII |
 330                                 (term->curr_attr &
 331                                  (ATTR_FGMASK | ATTR_BGMASK)));
 332         else
 333             term->erase_char = ERASE_CHAR;
 334     }
 335     if (reset_blink)
 336         term->blink_is_real = term->cfg.blinktext;
 337     if (reset_charclass)
 338         for (i = 0; i < 256; i++)
 339             term->wordness[i] = term->cfg.wordness[i];
 340
 341     if (term->cfg.no_alt_screen)
 342         swap_screen(term, 0, FALSE, FALSE);
 343     if (term->cfg.no_mouse_rep) {
 344         term->xterm_mouse = 0;
 345         set_raw_mouse_mode(term->frontend, 0);
 346     }
 347     if (term->cfg.no_remote_charset) {
 348         term->cset_attr[0] = term->cset_attr[1] = ATTR_ASCII;
 349         term->sco_acs = term->alt_sco_acs = 0;
 350         term->utf = 0;
 351     }
 352     if (!*term->cfg.printer) {
 353         term_print_finish(term);
 354     }
 355 }
 356
 357 /*
 358  * Clear the scrollback.
 359  */
 360 void term_clrsb(Terminal *term)
 361 {
 362     unsigned long *line;
 363     term->disptop = 0;
 364     while ((line = delpos234(term->scrollback, 0)) != NULL) {
 365         sfree(line);
 366     }
 367     term->tempsblines = 0;
 368     term->alt_sblines = 0;
 369     update_sbar(term);
 370 }
 371
 372 /*
 373  * Initialise the terminal.
 374  */
 375 Terminal *term_init(Config *mycfg, struct unicode_data *ucsdata,
 376                     void *frontend)
 377 {
 378     Terminal *term;
 379
 380     /*
 381      * Allocate a new Terminal structure and initialise the fields
 382      * that need it.
 383      */
 384     term = snew(Terminal);
 385     term->frontend = frontend;
 386     term->ucsdata = ucsdata;
 387     term->cfg = *mycfg;                /* STRUCTURE COPY */
 388     term->logctx = NULL;
 389     term->compatibility_level = TM_PUTTY;
 390     strcpy(term->id_string, "\033[?6c");
 391     term->last_blink = term->last_tblink = 0;
 392     term->paste_buffer = NULL;
 393     term->paste_len = 0;
 394     term->last_paste = 0;
 395     bufchain_init(&term->inbuf);
 396     bufchain_init(&term->printer_buf);
 397     term->printing = term->only_printing = FALSE;
 398     term->print_job = NULL;
 399     term->vt52_mode = FALSE;
 400     term->cr_lf_return = FALSE;
 401     term->seen_disp_event = FALSE;
 402     term->xterm_mouse = term->mouse_is_down = FALSE;
 403     term->reset_132 = FALSE;
 404     term->blinker = term->tblinker = 0;
 405     term->has_focus = 1;
 406     term->repeat_off = FALSE;
 407     term->termstate = TOPLEVEL;
 408     term->selstate = NO_SELECTION;
 409     term->curstype = 0;
 410
 411     term->screen = term->alt_screen = term->scrollback = NULL;
 412     term->tempsblines = 0;
 413     term->alt_sblines = 0;
 414     term->disptop = 0;
 415     term->disptext = term->dispcurs = NULL;
 416     term->tabs = NULL;
 417     deselect(term);
 418     term->rows = term->cols = -1;
 419     power_on(term);
 420     term->beephead = term->beeptail = NULL;
 421 #ifdef OPTIMISE_SCROLL
 422     term->scrollhead = term->scrolltail = NULL;
 423 #endif /* OPTIMISE_SCROLL */
 424     term->nbeeps = 0;
 425     term->lastbeep = FALSE;
 426     term->beep_overloaded = FALSE;
 427     term->attr_mask = 0xffffffff;
 428     term->resize_fn = NULL;
 429     term->resize_ctx = NULL;
 430     term->in_term_out = FALSE;
 431
 432     return term;
 433 }
 434
 435 void term_free(Terminal *term)
 436 {
 437     unsigned long *line;
 438     struct beeptime *beep;
 439
 440     while ((line = delpos234(term->scrollback, 0)) != NULL)
 441         sfree(line);
 442     freetree234(term->scrollback);
 443     while ((line = delpos234(term->screen, 0)) != NULL)
 444         sfree(line);
 445     freetree234(term->screen);
 446     while ((line = delpos234(term->alt_screen, 0)) != NULL)
 447         sfree(line);
 448     freetree234(term->alt_screen);
 449     sfree(term->disptext);
 450     while (term->beephead) {
 451         beep = term->beephead;
 452         term->beephead = beep->next;
 453         sfree(beep);
 454     }
 455     bufchain_clear(&term->inbuf);
 456     if(term->print_job)
 457         printer_finish_job(term->print_job);
 458     bufchain_clear(&term->printer_buf);
 459     sfree(term->paste_buffer);
 460     sfree(term);
 461 }
 462
 463 /*
 464  * Set up the terminal for a given size.
 465  */
 466 void term_size(Terminal *term, int newrows, int newcols, int newsavelines)
 467 {
 468     tree234 *newalt;
 469     unsigned long *newdisp, *line;
 470     int i, j;
 471     int sblen;
 472     int save_alt_which = term->alt_which;
 473
 474     if (newrows == term->rows && newcols == term->cols &&
 475         newsavelines == term->savelines)
 476         return;                        /* nothing to do */
 477
 478     deselect(term);
 479     swap_screen(term, 0, FALSE, FALSE);
 480
 481     term->alt_t = term->marg_t = 0;
 482     term->alt_b = term->marg_b = newrows - 1;
 483
 484     if (term->rows == -1) {
 485         term->scrollback = newtree234(NULL);
 486         term->screen = newtree234(NULL);
 487         term->tempsblines = 0;
 488         term->rows = 0;
 489     }
 490
 491     /*
 492      * Resize the screen and scrollback. We only need to shift
 493      * lines around within our data structures, because lineptr()
 494      * will take care of resizing each individual line if
 495      * necessary. So:
 496      *
 497      *  - If the new screen is longer, we shunt lines in from temporary
 498      *    scrollback if possible, otherwise we add new blank lines at
 499      *    the bottom.
 500      *
 501      *  - If the new screen is shorter, we remove any blank lines at
 502      *    the bottom if possible, otherwise shunt lines above the cursor
 503      *    to scrollback if possible, otherwise delete lines below the
 504      *    cursor.
 505      *
 506      *  - Then, if the new scrollback length is less than the
 507      *    amount of scrollback we actually have, we must throw some
 508      *    away.
 509      */
 510     sblen = count234(term->scrollback);
 511     /* Do this loop to expand the screen if newrows > rows */
 512     assert(term->rows == count234(term->screen));
 513     while (term->rows < newrows) {
 514         if (term->tempsblines > 0) {
 515             /* Insert a line from the scrollback at the top of the screen. */
 516             assert(sblen >= term->tempsblines);
 517             line = delpos234(term->scrollback, --sblen);
 518             term->tempsblines -= 1;
 519             addpos234(term->screen, line, 0);
 520             term->curs.y += 1;
 521             term->savecurs.y += 1;
 522         } else {
 523             /* Add a new blank line at the bottom of the screen. */
 524             line = snewn(newcols + 2, TTYPE);
 525             line[0] = newcols;
 526             for (j = 0; j < newcols; j++)
 527                 line[j + 1] = ERASE_CHAR;
 528             line[newcols + 1] = LATTR_NORM;
 529             addpos234(term->screen, line, count234(term->screen));
 530         }
 531         term->rows += 1;
 532     }
 533     /* Do this loop to shrink the screen if newrows < rows */
 534     while (term->rows > newrows) {
 535         if (term->curs.y < term->rows - 1) {
 536             /* delete bottom row, unless it contains the cursor */
 537             sfree(delpos234(term->screen, term->rows - 1));
 538         } else {
 539             /* push top row to scrollback */
 540             line = delpos234(term->screen, 0);
 541             addpos234(term->scrollback, line, sblen++);
 542             term->tempsblines += 1;
 543             term->curs.y -= 1;
 544             term->savecurs.y -= 1;
 545         }
 546         term->rows -= 1;
 547     }
 548     assert(term->rows == newrows);
 549     assert(count234(term->screen) == newrows);
 550
 551     /* Delete any excess lines from the scrollback. */
 552     while (sblen > newsavelines) {
 553         line = delpos234(term->scrollback, 0);
 554         sfree(line);
 555         sblen--;
 556     }
 557     if (sblen < term->tempsblines)
 558         term->tempsblines = sblen;
 559     assert(count234(term->scrollback) <= newsavelines);
 560     assert(count234(term->scrollback) >= term->tempsblines);
 561     term->disptop = 0;
 562
 563     /* Make a new displayed text buffer. */
 564     newdisp = snewn(newrows * (newcols + 1), TTYPE);
 565     for (i = 0; i < newrows * (newcols + 1); i++)
 566         newdisp[i] = ATTR_INVALID;
 567     sfree(term->disptext);
 568     term->disptext = newdisp;
 569     term->dispcurs = NULL;
 570
 571     /* Make a new alternate screen. */
 572     newalt = newtree234(NULL);
 573     for (i = 0; i < newrows; i++) {
 574         line = snewn(newcols + 2, TTYPE);
 575         line[0] = newcols;
 576         for (j = 0; j < newcols; j++)
 577             line[j + 1] = term->erase_char;
 578         line[newcols + 1] = LATTR_NORM;
 579         addpos234(newalt, line, i);
 580     }
 581     if (term->alt_screen) {
 582         while (NULL != (line = delpos234(term->alt_screen, 0)))
 583             sfree(line);
 584         freetree234(term->alt_screen);
 585     }
 586     term->alt_screen = newalt;
 587     term->alt_sblines = 0;
 588
 589     term->tabs = sresize(term->tabs, newcols, unsigned char);
 590     {
 591         int i;
 592         for (i = (term->cols > 0 ? term->cols : 0); i < newcols; i++)
 593             term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
 594     }
 595
 596     /* Check that the cursor positions are still valid. */
 597     if (term->savecurs.y < 0)
 598         term->savecurs.y = 0;
 599     if (term->savecurs.y >= newrows)
 600         term->savecurs.y = newrows - 1;
 601     if (term->curs.y < 0)
 602         term->curs.y = 0;
 603     if (term->curs.y >= newrows)
 604         term->curs.y = newrows - 1;
 605     if (term->curs.x >= newcols)
 606         term->curs.x = newcols - 1;
 607     term->alt_x = term->alt_y = 0;
 608     term->wrapnext = term->alt_wnext = FALSE;
 609
 610     term->rows = newrows;
 611     term->cols = newcols;
 612     term->savelines = newsavelines;
 613     fix_cpos;
 614
 615     swap_screen(term, save_alt_which, FALSE, FALSE);
 616
 617     update_sbar(term);
 618     term_update(term);
 619     if (term->resize_fn)
 620         term->resize_fn(term->resize_ctx, term->cols, term->rows);
 621 }
 622
 623 /*
 624  * Hand a function and context pointer to the terminal which it can
 625  * use to notify a back end of resizes.
 626  */
 627 void term_provide_resize_fn(Terminal *term,
 628                             void (*resize_fn)(void *, int, int),
 629                             void *resize_ctx)
 630 {
 631     term->resize_fn = resize_fn;
 632     term->resize_ctx = resize_ctx;
 633     if (term->cols > 0 && term->rows > 0)
 634         resize_fn(resize_ctx, term->cols, term->rows);
 635 }
 636
 637 /* Find the bottom line on the screen that has any content.
 638  * If only the top line has content, returns 0.
 639  * If no lines have content, return -1.
 640  */
 641 static int find_last_nonempty_line(Terminal * term, tree234 * screen)
 642 {
 643     int i;
 644     for (i = count234(screen) - 1; i >= 0; i--) {
 645         unsigned long *line = index234(screen, i);
 646         int j;
 647         int cols = line[0];
 648         for (j = 0; j < cols; j++) {
 649             if (line[j + 1] != term->erase_char) break;
 650         }
 651         if (j != cols) break;
 652     }
 653     return i;
 654 }
 655
 656 /*
 657  * Swap screens. If `reset' is TRUE and we have been asked to
 658  * switch to the alternate screen, we must bring most of its
 659  * configuration from the main screen and erase the contents of the
 660  * alternate screen completely. (This is even true if we're already
 661  * on it! Blame xterm.)
 662  */
 663 static void swap_screen(Terminal *term, int which, int reset, int keep_cur_pos)
 664 {
 665     int t;
 666     tree234 *ttr;
 667
 668     if (!which)
 669         reset = FALSE;                 /* do no weird resetting if which==0 */
 670
 671     if (which != term->alt_which) {
 672         term->alt_which = which;
 673
 674         ttr = term->alt_screen;
 675         term->alt_screen = term->screen;
 676         term->screen = ttr;
 677         term->alt_sblines = find_last_nonempty_line(term, term->alt_screen) + 1;
 678         t = term->curs.x;
 679         if (!reset && !keep_cur_pos)
 680             term->curs.x = term->alt_x;
 681         term->alt_x = t;
 682         t = term->curs.y;
 683         if (!reset && !keep_cur_pos)
 684             term->curs.y = term->alt_y;
 685         term->alt_y = t;
 686         t = term->marg_t;
 687         if (!reset) term->marg_t = term->alt_t;
 688         term->alt_t = t;
 689         t = term->marg_b;
 690         if (!reset) term->marg_b = term->alt_b;
 691         term->alt_b = t;
 692         t = term->dec_om;
 693         if (!reset) term->dec_om = term->alt_om;
 694         term->alt_om = t;
 695         t = term->wrap;
 696         if (!reset) term->wrap = term->alt_wrap;
 697         term->alt_wrap = t;
 698         t = term->wrapnext;
 699         if (!reset) term->wrapnext = term->alt_wnext;
 700         term->alt_wnext = t;
 701         t = term->insert;
 702         if (!reset) term->insert = term->alt_ins;
 703         term->alt_ins = t;
 704         t = term->cset;
 705         if (!reset) term->cset = term->alt_cset;
 706         term->alt_cset = t;
 707         t = term->utf;
 708         if (!reset) term->utf = term->alt_utf;
 709         term->alt_utf = t;
 710         t = term->sco_acs;
 711         if (!reset) term->sco_acs = term->alt_sco_acs;
 712         term->alt_sco_acs = t;
 713     }
 714
 715     if (reset && term->screen) {
 716         /*
 717          * Yes, this _is_ supposed to honour background-colour-erase.
 718          */
 719         erase_lots(term, FALSE, TRUE, TRUE);
 720     }
 721
 722     /*
 723      * This might not be possible if we're called during
 724      * initialisation.
 725      */
 726     if (term->screen)
 727         fix_cpos;
 728 }
 729
 730 /*
 731  * Update the scroll bar.
 732  */
 733 static void update_sbar(Terminal *term)
 734 {
 735     int nscroll = sblines(term);
 736     set_sbar(term->frontend, nscroll + term->rows,
 737              nscroll + term->disptop, term->rows);
 738 }
 739
 740 /*
 741  * Check whether the region bounded by the two pointers intersects
 742  * the scroll region, and de-select the on-screen selection if so.
 743  */
 744 static void check_selection(Terminal *term, pos from, pos to)
 745 {
 746     if (poslt(from, term->selend) && poslt(term->selstart, to))
 747         deselect(term);
 748 }
 749
 750 /*
 751  * Scroll the screen. (`lines' is +ve for scrolling forward, -ve
 752  * for backward.) `sb' is TRUE if the scrolling is permitted to
 753  * affect the scrollback buffer.
 754  *
 755  * NB this function invalidates all pointers into lines of the
 756  * screen data structures. In particular, you MUST call fix_cpos
 757  * after calling scroll() and before doing anything else that
 758  * uses the cpos shortcut pointer.
 759  */
 760 static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
 761 {
 762     unsigned long *line, *line2;
 763     int i, seltop, olddisptop, shift;
 764
 765     if (topline != 0 || term->alt_which != 0)
 766         sb = FALSE;
 767
 768     olddisptop = term->disptop;
 769     shift = lines;
 770     if (lines < 0) {
 771         while (lines < 0) {
 772             line = delpos234(term->screen, botline);
 773             line = resizeline(line, term->cols);
 774             for (i = 0; i < term->cols; i++)
 775                 line[i + 1] = term->erase_char;
 776             line[term->cols + 1] = 0;
 777             addpos234(term->screen, line, topline);
 778
 779             if (term->selstart.y >= topline && term->selstart.y <= botline) {
 780                 term->selstart.y++;
 781                 if (term->selstart.y > botline) {
 782                     term->selstart.y = botline + 1;
 783                     term->selstart.x = 0;
 784                 }
 785             }
 786             if (term->selend.y >= topline && term->selend.y <= botline) {
 787                 term->selend.y++;
 788                 if (term->selend.y > botline) {
 789                     term->selend.y = botline + 1;
 790                     term->selend.x = 0;
 791                 }
 792             }
 793
 794             lines++;
 795         }
 796     } else {
 797         while (lines > 0) {
 798             line = delpos234(term->screen, topline);
 799             if (sb && term->savelines > 0) {
 800                 int sblen = count234(term->scrollback);
 801                 /*
 802                  * We must add this line to the scrollback. We'll
 803                  * remove a line from the top of the scrollback to
 804                  * replace it, or allocate a new one if the
 805                  * scrollback isn't full.
 806                  */
 807                 if (sblen == term->savelines) {
 808                     sblen--, line2 = delpos234(term->scrollback, 0);
 809                 } else {
 810                     line2 = snewn(term->cols + 2, TTYPE);
 811                     line2[0] = term->cols;
 812                     term->tempsblines += 1;
 813                 }
 814                 addpos234(term->scrollback, line, sblen);
 815                 line = line2;
 816
 817                 /*
 818                  * If the user is currently looking at part of the
 819                  * scrollback, and they haven't enabled any options
 820                  * that are going to reset the scrollback as a
 821                  * result of this movement, then the chances are
 822                  * they'd like to keep looking at the same line. So
 823                  * we move their viewpoint at the same rate as the
 824                  * scroll, at least until their viewpoint hits the
 825                  * top end of the scrollback buffer, at which point
 826                  * we don't have the choice any more.
 827                  *
 828                  * Thanks to Jan Holmen Holsten for the idea and
 829                  * initial implementation.
 830                  */
 831                 if (term->disptop > -term->savelines && term->disptop < 0)
 832                     term->disptop--;
 833             }
 834             line = resizeline(line, term->cols);
 835             for (i = 0; i < term->cols; i++)
 836                 line[i + 1] = term->erase_char;
 837             line[term->cols + 1] = LATTR_NORM;
 838             addpos234(term->screen, line, botline);
 839
 840             /*
 841              * If the selection endpoints move into the scrollback,
 842              * we keep them moving until they hit the top. However,
 843              * of course, if the line _hasn't_ moved into the
 844              * scrollback then we don't do this, and cut them off
 845              * at the top of the scroll region.
 846              *
 847              * This applies to selstart and selend (for an existing
 848              * selection), and also selanchor (for one being
 849              * selected as we speak).
 850              */
 851             seltop = sb ? -term->savelines : topline;
 852
 853             if (term->selstate != NO_SELECTION) {
 854                 if (term->selstart.y >= seltop &&
 855                     term->selstart.y <= botline) {
 856                     term->selstart.y--;
 857                     if (term->selstart.y < seltop) {
 858                         term->selstart.y = seltop;
 859                         term->selstart.x = 0;
 860                     }
 861                 }
 862                 if (term->selend.y >= seltop && term->selend.y <= botline) {
 863                     term->selend.y--;
 864                     if (term->selend.y < seltop) {
 865                         term->selend.y = seltop;
 866                         term->selend.x = 0;
 867                     }
 868                 }
 869                 if (term->selanchor.y >= seltop &&
 870                     term->selanchor.y <= botline) {
 871                     term->selanchor.y--;
 872                     if (term->selanchor.y < seltop) {
 873                         term->selanchor.y = seltop;
 874                         term->selanchor.x = 0;
 875                     }
 876                 }
 877             }
 878
 879             lines--;
 880         }
 881     }
 882 #ifdef OPTIMISE_SCROLL
 883     shift += term->disptop - olddisptop;
 884     if (shift < term->rows && shift > -term->rows && shift != 0)
 885         scroll_display(term, topline, botline, shift);
 886 #endif /* OPTIMISE_SCROLL */
 887 }
 888
 889 #ifdef OPTIMISE_SCROLL
 890 /*
 891  * Add a scroll of a region on the screen into the pending scroll list.
 892  * `lines' is +ve for scrolling forward, -ve for backward.
 893  *
 894  * If the scroll is on the same area as the last scroll in the list,
 895  * merge them.
 896  */
 897 static void save_scroll(Terminal *term, int topline, int botline, int lines)
 898 {
 899     struct scrollregion *newscroll;
 900     if (term->scrolltail &&
 901         term->scrolltail->topline == topline &&
 902         term->scrolltail->botline == botline) {
 903         term->scrolltail->lines += lines;
 904     } else {
 905         newscroll = snew(struct scrollregion);
 906         newscroll->topline = topline;
 907         newscroll->botline = botline;
 908         newscroll->lines = lines;
 909         newscroll->next = NULL;
 910
 911         if (!term->scrollhead)
 912             term->scrollhead = newscroll;
 913         else
 914             term->scrolltail->next = newscroll;
 915         term->scrolltail = newscroll;
 916     }
 917 }
 918
 919 /*
 920  * Scroll the physical display, and our conception of it in disptext.
 921  */
 922 static void scroll_display(Terminal *term, int topline, int botline, int lines)
 923 {
 924     unsigned long *start, *end;
 925     int distance, size, i;
 926
 927     start = term->disptext + topline * (term->cols + 1);
 928     end = term->disptext + (botline + 1) * (term->cols + 1);
 929     distance = (lines > 0 ? lines : -lines) * (term->cols + 1);
 930     size = end - start - distance;
 931     if (lines > 0) {
 932         memmove(start, start + distance, size * TSIZE);
 933         if (term->dispcurs >= start + distance &&
 934             term->dispcurs <= start + distance + size)
 935             term->dispcurs -= distance;
 936         for (i = 0; i < distance; i++)
 937             (start + size)[i] |= ATTR_INVALID;
 938     } else {
 939         memmove(start + distance, start, size * TSIZE);
 940         if (term->dispcurs >= start && term->dispcurs <= start + size)
 941             term->dispcurs += distance;
 942         for (i = 0; i < distance; i++)
 943             start[i] |= ATTR_INVALID;
 944     }
 945     save_scroll(term, topline, botline, lines);
 946 }
 947 #endif /* OPTIMISE_SCROLL */
 948
 949 /*
 950  * Move the cursor to a given position, clipping at boundaries. We
 951  * may or may not want to clip at the scroll margin: marg_clip is 0
 952  * not to, 1 to disallow _passing_ the margins, and 2 to disallow
 953  * even _being_ outside the margins.
 954  */
 955 static void move(Terminal *term, int x, int y, int marg_clip)
 956 {
 957     if (x < 0)
 958         x = 0;
 959     if (x >= term->cols)
 960         x = term->cols - 1;
 961     if (marg_clip) {
 962         if ((term->curs.y >= term->marg_t || marg_clip == 2) &&
 963             y < term->marg_t)
 964             y = term->marg_t;
 965         if ((term->curs.y <= term->marg_b || marg_clip == 2) &&
 966             y > term->marg_b)
 967             y = term->marg_b;
 968     }
 969     if (y < 0)
 970         y = 0;
 971     if (y >= term->rows)
 972         y = term->rows - 1;
 973     term->curs.x = x;
 974     term->curs.y = y;
 975     fix_cpos;
 976     term->wrapnext = FALSE;
 977 }
 978
 979 /*
 980  * Save or restore the cursor and SGR mode.
 981  */
 982 static void save_cursor(Terminal *term, int save)
 983 {
 984     if (save) {
 985         term->savecurs = term->curs;
 986         term->save_attr = term->curr_attr;
 987         term->save_cset = term->cset;
 988         term->save_utf = term->utf;
 989         term->save_wnext = term->wrapnext;
 990         term->save_csattr = term->cset_attr[term->cset];
 991         term->save_sco_acs = term->sco_acs;
 992     } else {
 993         term->curs = term->savecurs;
 994         /* Make sure the window hasn't shrunk since the save */
 995         if (term->curs.x >= term->cols)
 996             term->curs.x = term->cols - 1;
 997         if (term->curs.y >= term->rows)
 998             term->curs.y = term->rows - 1;
 999
1000         term->curr_attr = term->save_attr;
1001         term->cset = term->save_cset;
1002         term->utf = term->save_utf;
1003         term->wrapnext = term->save_wnext;
1004         /*
1005          * wrapnext might reset to False if the x position is no
1006          * longer at the rightmost edge.
1007          */
1008         if (term->wrapnext && term->curs.x < term->cols-1)
1009             term->wrapnext = FALSE;
1010         term->cset_attr[term->cset] = term->save_csattr;
1011         term->sco_acs = term->save_sco_acs;
1012         fix_cpos;
1013         if (term->use_bce)
1014             term->erase_char = (' ' | ATTR_ASCII |
1015                                 (term->curr_attr &
1016                                  (ATTR_FGMASK | ATTR_BGMASK)));
1017     }
1018 }
1019
1020 /*
1021  * This function is called before doing _anything_ which affects
1022  * only part of a line of text. It is used to mark the boundary
1023  * between two character positions, and it indicates that some sort
1024  * of effect is going to happen on only one side of that boundary.
1025  *
1026  * The effect of this function is to check whether a CJK
1027  * double-width character is straddling the boundary, and to remove
1028  * it and replace it with two spaces if so. (Of course, one or
1029  * other of those spaces is then likely to be replaced with
1030  * something else again, as a result of whatever happens next.)
1031  *
1032  * Also, if the boundary is at the right-hand _edge_ of the screen,
1033  * it implies something deliberate is being done to the rightmost
1034  * column position; hence we must clear LATTR_WRAPPED2.
1035  *
1036  * The input to the function is the coordinates of the _second_
1037  * character of the pair.
1038  */
1039 static void check_boundary(Terminal *term, int x, int y)
1040 {
1041     unsigned long *ldata;
1042
1043     /* Validate input coordinates, just in case. */
1044     if (x == 0 || x > term->cols)
1045         return;
1046
1047     ldata = lineptr(y);
1048     if (x == term->cols) {
1049         ldata[x] &= ~LATTR_WRAPPED2;
1050     } else {
1051         if ((ldata[x] & (CHAR_MASK | CSET_MASK)) == UCSWIDE) {
1052             ldata[x-1] = ldata[x] =
1053                 (ldata[x-1] &~ (CHAR_MASK | CSET_MASK)) | ATTR_ASCII | ' ';
1054         }
1055     }
1056 }
1057
1058 /*
1059  * Erase a large portion of the screen: the whole screen, or the
1060  * whole line, or parts thereof.
1061  */
1062 static void erase_lots(Terminal *term,
1063                        int line_only, int from_begin, int to_end)
1064 {
1065     pos start, end;
1066     int erase_lattr;
1067     int erasing_lines_from_top = 0;
1068
1069     if (line_only) {
1070         start.y = term->curs.y;
1071         start.x = 0;
1072         end.y = term->curs.y + 1;
1073         end.x = 0;
1074         erase_lattr = FALSE;
1075     } else {
1076         start.y = 0;
1077         start.x = 0;
1078         end.y = term->rows;
1079         end.x = 0;
1080         erase_lattr = TRUE;
1081     }
1082     if (!from_begin) {
1083         start = term->curs;
1084     }
1085     if (!to_end) {
1086         end = term->curs;
1087         incpos(end);
1088     }
1089     if (!from_begin || !to_end)
1090         check_boundary(term, term->curs.x, term->curs.y);
1091     check_selection(term, start, end);
1092
1093     /* Clear screen also forces a full window redraw, just in case. */
1094     if (start.y == 0 && start.x == 0 && end.y == term->rows)
1095         term_invalidate(term);
1096
1097     /* Lines scrolled away shouldn't be brought back on if the terminal
1098      * resizes. */
1099     if (start.y == 0 && start.x == 0 && end.x == 0 && erase_lattr)
1100         erasing_lines_from_top = 1;
1101
1102     if (term->cfg.erase_to_scrollback && erasing_lines_from_top) {
1103         /* If it's a whole number of lines, starting at the top, and
1104          * we're fully erasing them, erase by scrolling and keep the
1105          * lines in the scrollback. */
1106         int scrolllines = end.y;
1107         if (end.y == term->rows) {
1108             /* Shrink until we find a non-empty row.*/
1109             scrolllines = find_last_nonempty_line(term, term->screen) + 1;
1110         }
1111         if (scrolllines > 0)
1112             scroll(term, 0, scrolllines - 1, scrolllines, TRUE);
1113         fix_cpos;
1114     } else {
1115         unsigned long *ldata = lineptr(start.y);
1116         while (poslt(start, end)) {
1117             if (start.x == term->cols) {
1118                 if (!erase_lattr)
1119                     ldata[start.x] &= ~(LATTR_WRAPPED | LATTR_WRAPPED2);
1120                 else
1121                     ldata[start.x] = LATTR_NORM;
1122             } else {
1123                 ldata[start.x] = term->erase_char;
1124             }
1125             if (incpos(start) && start.y < term->rows)
1126                 ldata = lineptr(start.y);
1127         }
1128     }
1129
1130     /* After an erase of lines from the top of the screen, we shouldn't
1131      * bring the lines back again if the terminal enlarges (since the user or
1132      * application has explictly thrown them away). */
1133     if (erasing_lines_from_top && !(term->alt_which))
1134         term->tempsblines = 0;
1135 }
1136
1137 /*
1138  * Insert or delete characters within the current line. n is +ve if
1139  * insertion is desired, and -ve for deletion.
1140  */
1141 static void insch(Terminal *term, int n)
1142 {
1143     int dir = (n < 0 ? -1 : +1);
1144     int m;
1145     pos cursplus;
1146     unsigned long *ldata;
1147
1148     n = (n < 0 ? -n : n);
1149     if (n > term->cols - term->curs.x)
1150         n = term->cols - term->curs.x;
1151     m = term->cols - term->curs.x - n;
1152     cursplus.y = term->curs.y;
1153     cursplus.x = term->curs.x + n;
1154     check_selection(term, term->curs, cursplus);
1155     check_boundary(term, term->curs.x, term->curs.y);
1156     if (dir < 0)
1157         check_boundary(term, term->curs.x + n, term->curs.y);
1158     ldata = lineptr(term->curs.y);
1159     if (dir < 0) {
1160         memmove(ldata + term->curs.x, ldata + term->curs.x + n, m * TSIZE);
1161         while (n--)
1162             ldata[term->curs.x + m++] = term->erase_char;
1163     } else {
1164         memmove(ldata + term->curs.x + n, ldata + term->curs.x, m * TSIZE);
1165         while (n--)
1166             ldata[term->curs.x + n] = term->erase_char;
1167     }
1168 }
1169
1170 /*
1171  * Toggle terminal mode `mode' to state `state'. (`query' indicates
1172  * whether the mode is a DEC private one or a normal one.)
1173  */
1174 static void toggle_mode(Terminal *term, int mode, int query, int state)
1175 {
1176     unsigned long ticks;
1177
1178     if (query)
1179         switch (mode) {
1180           case 1:                      /* DECCKM: application cursor keys */
1181             term->app_cursor_keys = state;
1182             break;
1183           case 2:                      /* DECANM: VT52 mode */
1184             term->vt52_mode = !state;
1185             if (term->vt52_mode) {
1186                 term->blink_is_real = FALSE;
1187                 term->vt52_bold = FALSE;
1188             } else {
1189                 term->blink_is_real = term->cfg.blinktext;
1190             }
1191             break;
1192           case 3:                      /* DECCOLM: 80/132 columns */
1193             deselect(term);
1194             if (!term->cfg.no_remote_resize)
1195                 request_resize(term->frontend, state ? 132 : 80, term->rows);
1196             term->reset_132 = state;
1197             term->alt_t = term->marg_t = 0;
1198             term->alt_b = term->marg_b = term->rows - 1;
1199             move(term, 0, 0, 0);
1200             erase_lots(term, FALSE, TRUE, TRUE);
1201             break;
1202           case 5:                      /* DECSCNM: reverse video */
1203             /*
1204              * Toggle reverse video. If we receive an OFF within the
1205              * visual bell timeout period after an ON, we trigger an
1206              * effective visual bell, so that ESC[?5hESC[?5l will
1207              * always be an actually _visible_ visual bell.
1208              */
1209             ticks = GETTICKCOUNT();
1210             /* turn off a previous vbell to avoid inconsistencies */
1211             if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
1212                 term->in_vbell = FALSE;
1213             if (term->rvideo && !state &&    /* we're turning it off... */
1214                 (ticks - term->rvbell_startpoint) < VBELL_TIMEOUT) {/*...soon*/
1215                 /* If there's no vbell timeout already, or this one lasts
1216                  * longer, replace vbell_timeout with ours. */
1217                 if (!term->in_vbell ||
1218                     (term->rvbell_startpoint - term->vbell_startpoint <
1219                      VBELL_TIMEOUT))
1220                     term->vbell_startpoint = term->rvbell_startpoint;
1221                 term->in_vbell = TRUE; /* may clear rvideo but set in_vbell */
1222             } else if (!term->rvideo && state) {
1223                 /* This is an ON, so we notice the time and save it. */
1224                 term->rvbell_startpoint = ticks;
1225             }
1226             term->rvideo = state;
1227             term->seen_disp_event = TRUE;
1228             if (state)
1229                 term_update(term);
1230             break;
1231           case 6:                      /* DECOM: DEC origin mode */
1232             term->dec_om = state;
1233             break;
1234           case 7:                      /* DECAWM: auto wrap */
1235             term->wrap = state;
1236             break;
1237           case 8:                      /* DECARM: auto key repeat */
1238             term->repeat_off = !state;
1239             break;
1240           case 10:                     /* DECEDM: set local edit mode */
1241             term->term_editing = state;
1242             if (term->ldisc)           /* cause ldisc to notice changes */
1243                 ldisc_send(term->ldisc, NULL, 0, 0);
1244             break;
1245           case 25:                     /* DECTCEM: enable/disable cursor */
1246             compatibility2(OTHER, VT220);
1247             term->cursor_on = state;
1248             term->seen_disp_event = TRUE;
1249             break;
1250           case 47:                     /* alternate screen */
1251             compatibility(OTHER);
1252             deselect(term);
1253             swap_screen(term, term->cfg.no_alt_screen ? 0 : state, FALSE, FALSE);
1254             term->disptop = 0;
1255             break;
1256           case 1000:                   /* xterm mouse 1 */
1257             term->xterm_mouse = state ? 1 : 0;
1258             set_raw_mouse_mode(term->frontend, state);
1259             break;
1260           case 1002:                   /* xterm mouse 2 */
1261             term->xterm_mouse = state ? 2 : 0;
1262             set_raw_mouse_mode(term->frontend, state);
1263             break;
1264           case 1047:                   /* alternate screen */
1265             compatibility(OTHER);
1266             deselect(term);
1267             swap_screen(term, term->cfg.no_alt_screen ? 0 : state, TRUE, TRUE);
1268             term->disptop = 0;
1269             break;
1270           case 1048:                   /* save/restore cursor */
1271             if (!term->cfg.no_alt_screen)
1272                 save_cursor(term, state);
1273             if (!state) term->seen_disp_event = TRUE;
1274             break;
1275           case 1049:                   /* cursor & alternate screen */
1276             if (state && !term->cfg.no_alt_screen)
1277                 save_cursor(term, state);
1278             if (!state) term->seen_disp_event = TRUE;
1279             compatibility(OTHER);
1280             deselect(term);
1281             swap_screen(term, term->cfg.no_alt_screen ? 0 : state, TRUE, FALSE);
1282             if (!state && !term->cfg.no_alt_screen)
1283                 save_cursor(term, state);
1284             term->disptop = 0;
1285             break;
1286     } else
1287         switch (mode) {
1288           case 4:                      /* IRM: set insert mode */
1289             compatibility(VT102);
1290             term->insert = state;
1291             break;
1292           case 12:                     /* SRM: set echo mode */
1293             term->term_echoing = !state;
1294             if (term->ldisc)           /* cause ldisc to notice changes */
1295                 ldisc_send(term->ldisc, NULL, 0, 0);
1296             break;
1297           case 20:                     /* LNM: Return sends ... */
1298             term->cr_lf_return = state;
1299             break;
1300           case 34:                     /* WYULCURM: Make cursor BIG */
1301             compatibility2(OTHER, VT220);
1302             term->big_cursor = !state;
1303         }
1304 }
1305
1306 /*
1307  * Process an OSC sequence: set window title or icon name.
1308  */
1309 static void do_osc(Terminal *term)
1310 {
1311     if (term->osc_w) {
1312         while (term->osc_strlen--)
1313             term->wordness[(unsigned char)
1314                 term->osc_string[term->osc_strlen]] = term->esc_args[0];
1315     } else {
1316         term->osc_string[term->osc_strlen] = '\0';
1317         switch (term->esc_args[0]) {
1318           case 0:
1319           case 1:
1320             if (!term->cfg.no_remote_wintitle)
1321                 set_icon(term->frontend, term->osc_string);
1322             if (term->esc_args[0] == 1)
1323                 break;
1324             /* fall through: parameter 0 means set both */
1325           case 2:
1326           case 21:
1327             if (!term->cfg.no_remote_wintitle)
1328                 set_title(term->frontend, term->osc_string);
1329             break;
1330         }
1331     }
1332 }
1333
1334 /*
1335  * ANSI printing routines.
1336  */
1337 static void term_print_setup(Terminal *term)
1338 {
1339     bufchain_clear(&term->printer_buf);
1340     term->print_job = printer_start_job(term->cfg.printer);
1341 }
1342 static void term_print_flush(Terminal *term)
1343 {
1344     void *data;
1345     int len;
1346     int size;
1347     while ((size = bufchain_size(&term->printer_buf)) > 5) {
1348         bufchain_prefix(&term->printer_buf, &data, &len);
1349         if (len > size-5)
1350             len = size-5;
1351         printer_job_data(term->print_job, data, len);
1352         bufchain_consume(&term->printer_buf, len);
1353     }
1354 }
1355 static void term_print_finish(Terminal *term)
1356 {
1357     void *data;
1358     int len, size;
1359     char c;
1360
1361     if (!term->printing && !term->only_printing)
1362         return;                        /* we need do nothing */
1363
1364     term_print_flush(term);
1365     while ((size = bufchain_size(&term->printer_buf)) > 0) {
1366         bufchain_prefix(&term->printer_buf, &data, &len);
1367         c = *(char *)data;
1368         if (c == '\033' || c == '\233') {
1369             bufchain_consume(&term->printer_buf, size);
1370             break;
1371         } else {
1372             printer_job_data(term->print_job, &c, 1);
1373             bufchain_consume(&term->printer_buf, 1);
1374         }
1375     }
1376     printer_finish_job(term->print_job);
1377     term->print_job = NULL;
1378     term->printing = term->only_printing = FALSE;
1379 }
1380
1381 /*
1382  * Remove everything currently in `inbuf' and stick it up on the
1383  * in-memory display. There's a big state machine in here to
1384  * process escape sequences...
1385  */
1386 void term_out(Terminal *term)
1387 {
1388     int c, unget;
1389     unsigned char localbuf[256], *chars;
1390     int nchars = 0;
1391
1392     unget = -1;
1393
1394     chars = NULL;                      /* placate compiler warnings */
1395     while (nchars > 0 || bufchain_size(&term->inbuf) > 0) {
1396         if (unget == -1) {
1397             if (nchars == 0) {
1398                 void *ret;
1399                 bufchain_prefix(&term->inbuf, &ret, &nchars);
1400                 if (nchars > sizeof(localbuf))
1401                     nchars = sizeof(localbuf);
1402                 memcpy(localbuf, ret, nchars);
1403                 bufchain_consume(&term->inbuf, nchars);
1404                 chars = localbuf;
1405                 assert(chars != NULL);
1406             }
1407             c = *chars++;
1408             nchars--;
1409
1410             /*
1411              * Optionally log the session traffic to a file. Useful for
1412              * debugging and possibly also useful for actual logging.
1413              */
1414             if (term->cfg.logtype == LGTYP_DEBUG && term->logctx)
1415                 logtraffic(term->logctx, (unsigned char) c, LGTYP_DEBUG);
1416         } else {
1417             c = unget;
1418             unget = -1;
1419         }
1420
1421         /* Note only VT220+ are 8-bit VT102 is seven bit, it shouldn't even
1422          * be able to display 8-bit characters, but I'll let that go 'cause
1423          * of i18n.
1424          */
1425
1426         /*
1427          * If we're printing, add the character to the printer
1428          * buffer.
1429          */
1430         if (term->printing) {
1431             bufchain_add(&term->printer_buf, &c, 1);
1432
1433             /*
1434              * If we're in print-only mode, we use a much simpler
1435              * state machine designed only to recognise the ESC[4i
1436              * termination sequence.
1437              */
1438             if (term->only_printing) {
1439                 if (c == '\033')
1440                     term->print_state = 1;
1441                 else if (c == (unsigned char)'\233')
1442                     term->print_state = 2;
1443                 else if (c == '[' && term->print_state == 1)
1444                     term->print_state = 2;
1445                 else if (c == '4' && term->print_state == 2)
1446                     term->print_state = 3;
1447                 else if (c == 'i' && term->print_state == 3)
1448                     term->print_state = 4;
1449                 else
1450                     term->print_state = 0;
1451                 if (term->print_state == 4) {
1452                     term_print_finish(term);
1453                 }
1454                 continue;
1455             }
1456         }
1457
1458         /* First see about all those translations. */
1459         if (term->termstate == TOPLEVEL) {
1460             if (in_utf(term))
1461                 switch (term->utf_state) {
1462                   case 0:
1463                     if (c < 0x80) {
1464                         /* UTF-8 must be stateless so we ignore iso2022. */
1465                         if (term->ucsdata->unitab_ctrl[c] != 0xFF)
1466                              c = term->ucsdata->unitab_ctrl[c];
1467                         else c = ((unsigned char)c) | ATTR_ASCII;
1468                         break;
1469                     } else if ((c & 0xe0) == 0xc0) {
1470                         term->utf_size = term->utf_state = 1;
1471                         term->utf_char = (c & 0x1f);
1472                     } else if ((c & 0xf0) == 0xe0) {
1473                         term->utf_size = term->utf_state = 2;
1474                         term->utf_char = (c & 0x0f);
1475                     } else if ((c & 0xf8) == 0xf0) {
1476                         term->utf_size = term->utf_state = 3;
1477                         term->utf_char = (c & 0x07);
1478                     } else if ((c & 0xfc) == 0xf8) {
1479                         term->utf_size = term->utf_state = 4;
1480                         term->utf_char = (c & 0x03);
1481                     } else if ((c & 0xfe) == 0xfc) {
1482                         term->utf_size = term->utf_state = 5;
1483                         term->utf_char = (c & 0x01);
1484                     } else {
1485                         c = UCSERR;
1486                         break;
1487                     }
1488                     continue;
1489                   case 1:
1490                   case 2:
1491                   case 3:
1492                   case 4:
1493                   case 5:
1494                     if ((c & 0xC0) != 0x80) {
1495                         unget = c;
1496                         c = UCSERR;
1497                         term->utf_state = 0;
1498                         break;
1499                     }
1500                     term->utf_char = (term->utf_char << 6) | (c & 0x3f);
1501                     if (--term->utf_state)
1502                         continue;
1503
1504                     c = term->utf_char;
1505
1506                     /* Is somebody trying to be evil! */
1507                     if (c < 0x80 ||
1508                         (c < 0x800 && term->utf_size >= 2) ||
1509                         (c < 0x10000 && term->utf_size >= 3) ||
1510                         (c < 0x200000 && term->utf_size >= 4) ||
1511                         (c < 0x4000000 && term->utf_size >= 5))
1512                         c = UCSERR;
1513
1514                     /* Unicode line separator and paragraph separator are CR-LF */
1515                     if (c == 0x2028 || c == 0x2029)
1516                         c = 0x85;
1517
1518                     /* High controls are probably a Baaad idea too. */
1519                     if (c < 0xA0)
1520                         c = 0xFFFD;
1521
1522                     /* The UTF-16 surrogates are not nice either. */
1523                     /*       The standard give the option of decoding these:
1524                      *       I don't want to! */
1525                     if (c >= 0xD800 && c < 0xE000)
1526                         c = UCSERR;
1527
1528                     /* ISO 10646 characters now limited to UTF-16 range. */
1529                     if (c > 0x10FFFF)
1530                         c = UCSERR;
1531
1532                     /* This is currently a TagPhobic application.. */
1533                     if (c >= 0xE0000 && c <= 0xE007F)
1534                         continue;
1535
1536                     /* U+FEFF is best seen as a null. */
1537                     if (c == 0xFEFF)
1538                         continue;
1539                     /* But U+FFFE is an error. */
1540                     if (c == 0xFFFE || c == 0xFFFF)
1541                         c = UCSERR;
1542
1543                     /* Oops this is a 16bit implementation */
1544                     if (c >= 0x10000)
1545                         c = 0xFFFD;
1546                     break;
1547             }
1548             /* Are we in the nasty ACS mode? Note: no sco in utf mode. */
1549             else if(term->sco_acs &&
1550                     (c!='\033' && c!='\012' && c!='\015' && c!='\b'))
1551             {
1552                if (term->sco_acs == 2) c |= 0x80;
1553                c |= ATTR_SCOACS;
1554             } else {
1555                 switch (term->cset_attr[term->cset]) {
1556                     /*
1557                      * Linedraw characters are different from 'ESC ( B'
1558                      * only for a small range. For ones outside that
1559                      * range, make sure we use the same font as well as
1560                      * the same encoding.
1561                      */
1562                   case ATTR_LINEDRW:
1563                     if (term->ucsdata->unitab_ctrl[c] != 0xFF)
1564                         c = term->ucsdata->unitab_ctrl[c];
1565                     else
1566                         c = ((unsigned char) c) | ATTR_LINEDRW;
1567                     break;
1568
1569                   case ATTR_GBCHR:
1570                     /* If UK-ASCII, make the '#' a LineDraw Pound */
1571                     if (c == '#') {
1572                         c = '}' | ATTR_LINEDRW;
1573                         break;
1574                     }
1575                   /*FALLTHROUGH*/ case ATTR_ASCII:
1576                     if (term->ucsdata->unitab_ctrl[c] != 0xFF)
1577                         c = term->ucsdata->unitab_ctrl[c];
1578                     else
1579                         c = ((unsigned char) c) | ATTR_ASCII;
1580                     break;
1581                 case ATTR_SCOACS:
1582                     if (c>=' ') c = ((unsigned char)c) | ATTR_SCOACS;
1583                     break;
1584                 }
1585             }
1586         }
1587
1588         /* How about C1 controls ? */
1589         if ((c & -32) == 0x80 && term->termstate < DO_CTRLS &&
1590             !term->vt52_mode && has_compat(VT220)) {
1591             term->termstate = SEEN_ESC;
1592             term->esc_query = FALSE;
1593             c = '@' + (c & 0x1F);
1594         }
1595
1596         /* Or the GL control. */
1597         if (c == '\177' && term->termstate < DO_CTRLS && has_compat(OTHER)) {
1598             if (term->curs.x && !term->wrapnext)
1599                 term->curs.x--;
1600             term->wrapnext = FALSE;
1601             fix_cpos;
1602             if (!term->cfg.no_dbackspace)    /* destructive bksp might be disabled */
1603                 *term->cpos = (' ' | term->curr_attr | ATTR_ASCII);
1604         } else
1605             /* Or normal C0 controls. */
1606         if ((c & -32) == 0 && term->termstate < DO_CTRLS) {
1607             switch (c) {
1608               case '\005':             /* ENQ: terminal type query */
1609                 /* Strictly speaking this is VT100 but a VT100 defaults to
1610                  * no response. Other terminals respond at their option.
1611                  *
1612                  * Don't put a CR in the default string as this tends to
1613                  * upset some weird software.
1614                  *
1615                  * An xterm returns "xterm" (5 characters)
1616                  */
1617                 compatibility(ANSIMIN);
1618                 if (term->ldisc) {
1619                     char abuf[256], *s, *d;
1620                     int state = 0;
1621                     for (s = term->cfg.answerback, d = abuf; *s; s++) {
1622                         if (state) {
1623                             if (*s >= 'a' && *s <= 'z')
1624                                 *d++ = (*s - ('a' - 1));
1625                             else if ((*s >= '@' && *s <= '_') ||
1626                                      *s == '?' || (*s & 0x80))
1627                                 *d++ = ('@' ^ *s);
1628                             else if (*s == '~')
1629                                 *d++ = '^';
1630                             state = 0;
1631                         } else if (*s == '^') {
1632                             state = 1;
1633                         } else
1634                             *d++ = *s;
1635                     }
1636                     lpage_send(term->ldisc, DEFAULT_CODEPAGE,
1637                                abuf, d - abuf, 0);
1638                 }
1639                 break;
1640               case '\007':            /* BEL: Bell */
1641                 {
1642                     struct beeptime *newbeep;
1643                     unsigned long ticks;
1644
1645                     ticks = GETTICKCOUNT();
1646
1647                     if (!term->beep_overloaded) {
1648                         newbeep = snew(struct beeptime);
1649                         newbeep->ticks = ticks;
1650                         newbeep->next = NULL;
1651                         if (!term->beephead)
1652                             term->beephead = newbeep;
1653                         else
1654                             term->beeptail->next = newbeep;
1655                         term->beeptail = newbeep;
1656                         term->nbeeps++;
1657                     }
1658
1659                     /*
1660                      * Throw out any beeps that happened more than
1661                      * t seconds ago.
1662                      */
1663                     while (term->beephead &&
1664                            term->beephead->ticks < ticks - term->cfg.bellovl_t) {
1665                         struct beeptime *tmp = term->beephead;
1666                         term->beephead = tmp->next;
1667                         sfree(tmp);
1668                         if (!term->beephead)
1669                             term->beeptail = NULL;
1670                         term->nbeeps--;
1671                     }
1672
1673                     if (term->cfg.bellovl && term->beep_overloaded &&
1674                         ticks - term->lastbeep >= (unsigned)term->cfg.bellovl_s) {
1675                         /*
1676                          * If we're currently overloaded and the
1677                          * last beep was more than s seconds ago,
1678                          * leave overload mode.
1679                          */
1680                         term->beep_overloaded = FALSE;
1681                     } else if (term->cfg.bellovl && !term->beep_overloaded &&
1682                                term->nbeeps >= term->cfg.bellovl_n) {
1683                         /*
1684                          * Now, if we have n or more beeps
1685                          * remaining in the queue, go into overload
1686                          * mode.
1687                          */
1688                         term->beep_overloaded = TRUE;
1689                     }
1690                     term->lastbeep = ticks;
1691
1692                     /*
1693                      * Perform an actual beep if we're not overloaded.
1694                      */
1695                     if (!term->cfg.bellovl || !term->beep_overloaded) {
1696                         beep(term->frontend, term->cfg.beep);
1697                         if (term->cfg.beep == BELL_VISUAL) {
1698                             term->in_vbell = TRUE;
1699                             term->vbell_startpoint = ticks;
1700                             term_update(term);
1701                         }
1702                     }
1703                     term->seen_disp_event = TRUE;
1704                 }
1705                 break;
1706               case '\b':              /* BS: Back space */
1707                 if (term->curs.x == 0 &&
1708                     (term->curs.y == 0 || term->wrap == 0))
1709                     /* do nothing */ ;
1710                 else if (term->curs.x == 0 && term->curs.y > 0)
1711                     term->curs.x = term->cols - 1, term->curs.y--;
1712                 else if (term->wrapnext)
1713                     term->wrapnext = FALSE;
1714                 else
1715                     term->curs.x--;
1716                 fix_cpos;
1717                 term->seen_disp_event = TRUE;
1718                 break;
1719               case '\016':            /* LS1: Locking-shift one */
1720                 compatibility(VT100);
1721                 term->cset = 1;
1722                 break;
1723               case '\017':            /* LS0: Locking-shift zero */
1724                 compatibility(VT100);
1725                 term->cset = 0;
1726                 break;
1727               case '\033':            /* ESC: Escape */
1728                 if (term->vt52_mode)
1729                     term->termstate = VT52_ESC;
1730                 else {
1731                     compatibility(ANSIMIN);
1732                     term->termstate = SEEN_ESC;
1733                     term->esc_query = FALSE;
1734                 }
1735                 break;
1736               case '\015':            /* CR: Carriage return */
1737                 term->curs.x = 0;
1738                 term->wrapnext = FALSE;
1739                 fix_cpos;
1740                 term->seen_disp_event = TRUE;
1741                 term->paste_hold = 0;
1742                 if (term->logctx)
1743                     logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
1744                 break;
1745               case '\014':            /* FF: Form feed */
1746                 if (has_compat(SCOANSI)) {
1747                     move(term, 0, 0, 0);
1748                     erase_lots(term, FALSE, FALSE, TRUE);
1749                     term->disptop = 0;
1750                     term->wrapnext = FALSE;
1751                     term->seen_disp_event = 1;
1752                     break;
1753                 }
1754               case '\013':            /* VT: Line tabulation */
1755                 compatibility(VT100);
1756               case '\012':            /* LF: Line feed */
1757                 if (term->curs.y == term->marg_b)
1758                     scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1759                 else if (term->curs.y < term->rows - 1)
1760                     term->curs.y++;
1761                 if (term->cfg.lfhascr)
1762                     term->curs.x = 0;
1763                 fix_cpos;
1764                 term->wrapnext = FALSE;
1765                 term->seen_disp_event = 1;
1766                 term->paste_hold = 0;
1767                 if (term->logctx)
1768                     logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
1769                 break;
1770               case '\t':              /* HT: Character tabulation */
1771                 {
1772                     pos old_curs = term->curs;
1773                     unsigned long *ldata = lineptr(term->curs.y);
1774
1775                     do {
1776                         term->curs.x++;
1777                     } while (term->curs.x < term->cols - 1 &&
1778                              !term->tabs[term->curs.x]);
1779
1780                     if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM) {
1781                         if (term->curs.x >= term->cols / 2)
1782                             term->curs.x = term->cols / 2 - 1;
1783                     } else {
1784                         if (term->curs.x >= term->cols)
1785                             term->curs.x = term->cols - 1;
1786                     }
1787
1788                     fix_cpos;
1789                     check_selection(term, old_curs, term->curs);
1790                 }
1791                 term->seen_disp_event = TRUE;
1792                 break;
1793             }
1794         } else
1795             switch (term->termstate) {
1796               case TOPLEVEL:
1797                 /* Only graphic characters get this far;
1798                  * ctrls are stripped above */
1799                 if (term->wrapnext && term->wrap) {
1800                     term->cpos[1] |= LATTR_WRAPPED;
1801                     if (term->curs.y == term->marg_b)
1802                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1803                     else if (term->curs.y < term->rows - 1)
1804                         term->curs.y++;
1805                     term->curs.x = 0;
1806                     fix_cpos;
1807                     term->wrapnext = FALSE;
1808                 }
1809                 if (term->insert)
1810                     insch(term, 1);
1811                 if (term->selstate != NO_SELECTION) {
1812                     pos cursplus = term->curs;
1813                     incpos(cursplus);
1814                     check_selection(term, term->curs, cursplus);
1815                 }
1816                 if (((c & CSET_MASK) == ATTR_ASCII || (c & CSET_MASK) == 0) &&
1817                     term->logctx)
1818                     logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
1819                 {
1820                     int width = 0;
1821                     if (DIRECT_CHAR(c))
1822                         width = 1;
1823                     if (!width)
1824                         width = wcwidth((wchar_t) c);
1825                     switch (width) {
1826                       case 2:
1827                         /*
1828                          * If we're about to display a double-width
1829                          * character starting in the rightmost
1830                          * column, then we do something special
1831                          * instead. We must print a space in the
1832                          * last column of the screen, then wrap;
1833                          * and we also set LATTR_WRAPPED2 which
1834                          * instructs subsequent cut-and-pasting not
1835                          * only to splice this line to the one
1836                          * after it, but to ignore the space in the
1837                          * last character position as well.
1838                          * (Because what was actually output to the
1839                          * terminal was presumably just a sequence
1840                          * of CJK characters, and we don't want a
1841                          * space to be pasted in the middle of
1842                          * those just because they had the
1843                          * misfortune to start in the wrong parity
1844                          * column. xterm concurs.)
1845                          */
1846                         check_boundary(term, term->curs.x, term->curs.y);
1847                         check_boundary(term, term->curs.x+2, term->curs.y);
1848                         if (term->curs.x == term->cols-1) {
1849                             *term->cpos++ = ATTR_ASCII | ' ' | term->curr_attr;
1850                             *term->cpos |= LATTR_WRAPPED | LATTR_WRAPPED2;
1851                             if (term->curs.y == term->marg_b)
1852                                 scroll(term, term->marg_t, term->marg_b,
1853                                        1, TRUE);
1854                             else if (term->curs.y < term->rows - 1)
1855                                 term->curs.y++;
1856                             term->curs.x = 0;
1857                             fix_cpos;
1858                             /* Now we must check_boundary again, of course. */
1859                             check_boundary(term, term->curs.x, term->curs.y);
1860                             check_boundary(term, term->curs.x+2, term->curs.y);
1861                         }
1862                         *term->cpos++ = c | term->curr_attr;
1863                         *term->cpos++ = UCSWIDE | term->curr_attr;
1864                         term->curs.x++;
1865                         break;
1866                       case 1:
1867                         check_boundary(term, term->curs.x, term->curs.y);
1868                         check_boundary(term, term->curs.x+1, term->curs.y);
1869                         *term->cpos++ = c | term->curr_attr;
1870                         break;
1871                       default:
1872                         continue;
1873                     }
1874                 }
1875                 term->curs.x++;
1876                 if (term->curs.x == term->cols) {
1877                     term->cpos--;
1878                     term->curs.x--;
1879                     term->wrapnext = TRUE;
1880                     if (term->wrap && term->vt52_mode) {
1881                         term->cpos[1] |= LATTR_WRAPPED;
1882                         if (term->curs.y == term->marg_b)
1883                             scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1884                         else if (term->curs.y < term->rows - 1)
1885                             term->curs.y++;
1886                         term->curs.x = 0;
1887                         fix_cpos;
1888                         term->wrapnext = FALSE;
1889                     }
1890                 }
1891                 term->seen_disp_event = 1;
1892                 break;
1893
1894               case OSC_MAYBE_ST:
1895                 /*
1896                  * This state is virtually identical to SEEN_ESC, with the
1897                  * exception that we have an OSC sequence in the pipeline,
1898                  * and _if_ we see a backslash, we process it.
1899                  */
1900                 if (c == '\\') {
1901                     do_osc(term);
1902                     term->termstate = TOPLEVEL;
1903                     break;
1904                 }
1905                 /* else fall through */
1906               case SEEN_ESC:
1907                 if (c >= ' ' && c <= '/') {
1908                     if (term->esc_query)
1909                         term->esc_query = -1;
1910                     else
1911                         term->esc_query = c;
1912                     break;
1913                 }
1914                 term->termstate = TOPLEVEL;
1915                 switch (ANSI(c, term->esc_query)) {
1916                   case '[':             /* enter CSI mode */
1917                     term->termstate = SEEN_CSI;
1918                     term->esc_nargs = 1;
1919                     term->esc_args[0] = ARG_DEFAULT;
1920                     term->esc_query = FALSE;
1921                     break;
1922                   case ']':             /* OSC: xterm escape sequences */
1923                     /* Compatibility is nasty here, xterm, linux, decterm yuk! */
1924                     compatibility(OTHER);
1925                     term->termstate = SEEN_OSC;
1926                     term->esc_args[0] = 0;
1927                     break;
1928                   case '7':             /* DECSC: save cursor */
1929                     compatibility(VT100);
1930                     save_cursor(term, TRUE);
1931                     break;
1932                   case '8':             /* DECRC: restore cursor */
1933                     compatibility(VT100);
1934                     save_cursor(term, FALSE);
1935                     term->seen_disp_event = TRUE;
1936                     break;
1937                   case '=':             /* DECKPAM: Keypad application mode */
1938                     compatibility(VT100);
1939                     term->app_keypad_keys = TRUE;
1940                     break;
1941                   case '>':             /* DECKPNM: Keypad numeric mode */
1942                     compatibility(VT100);
1943                     term->app_keypad_keys = FALSE;
1944                     break;
1945                   case 'D':            /* IND: exactly equivalent to LF */
1946                     compatibility(VT100);
1947                     if (term->curs.y == term->marg_b)
1948                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1949                     else if (term->curs.y < term->rows - 1)
1950                         term->curs.y++;
1951                     fix_cpos;
1952                     term->wrapnext = FALSE;
1953                     term->seen_disp_event = TRUE;
1954                     break;
1955                   case 'E':            /* NEL: exactly equivalent to CR-LF */
1956                     compatibility(VT100);
1957                     term->curs.x = 0;
1958                     if (term->curs.y == term->marg_b)
1959                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1960                     else if (term->curs.y < term->rows - 1)
1961                         term->curs.y++;
1962                     fix_cpos;
1963                     term->wrapnext = FALSE;
1964                     term->seen_disp_event = TRUE;
1965                     break;
1966                   case 'M':            /* RI: reverse index - backwards LF */
1967                     compatibility(VT100);
1968                     if (term->curs.y == term->marg_t)
1969                         scroll(term, term->marg_t, term->marg_b, -1, TRUE);
1970                     else if (term->curs.y > 0)
1971                         term->curs.y--;
1972                     fix_cpos;
1973                     term->wrapnext = FALSE;
1974                     term->seen_disp_event = TRUE;
1975                     break;
1976                   case 'Z':            /* DECID: terminal type query */
1977                     compatibility(VT100);
1978                     if (term->ldisc)
1979                         ldisc_send(term->ldisc, term->id_string,
1980                                    strlen(term->id_string), 0);
1981                     break;
1982                   case 'c':            /* RIS: restore power-on settings */
1983                     compatibility(VT100);
1984                     power_on(term);
1985                     if (term->ldisc)   /* cause ldisc to notice changes */
1986                         ldisc_send(term->ldisc, NULL, 0, 0);
1987                     if (term->reset_132) {
1988                         if (!term->cfg.no_remote_resize)
1989                             request_resize(term->frontend, 80, term->rows);
1990                         term->reset_132 = 0;
1991                     }
1992                     fix_cpos;
1993                     term->disptop = 0;
1994                     term->seen_disp_event = TRUE;
1995                     break;
1996                   case 'H':            /* HTS: set a tab */
1997                     compatibility(VT100);
1998                     term->tabs[term->curs.x] = TRUE;
1999                     break;
2000
2001                   case ANSI('8', '#'):  /* DECALN: fills screen with Es :-) */
2002                     compatibility(VT100);
2003                     {
2004                         unsigned long *ldata;
2005                         int i, j;
2006                         pos scrtop, scrbot;
2007
2008                         for (i = 0; i < term->rows; i++) {
2009                             ldata = lineptr(i);
2010                             for (j = 0; j < term->cols; j++)
2011                                 ldata[j] = ATTR_DEFAULT | 'E';
2012                             ldata[term->cols] = 0;
2013                         }
2014                         term->disptop = 0;
2015                         term->seen_disp_event = TRUE;
2016                         scrtop.x = scrtop.y = 0;
2017                         scrbot.x = 0;
2018                         scrbot.y = term->rows;
2019                         check_selection(term, scrtop, scrbot);
2020                     }
2021                     break;
2022
2023                   case ANSI('3', '#'):
2024                   case ANSI('4', '#'):
2025                   case ANSI('5', '#'):
2026                   case ANSI('6', '#'):
2027                     compatibility(VT100);
2028                     {
2029                         unsigned long nlattr;
2030                         unsigned long *ldata;
2031                         switch (ANSI(c, term->esc_query)) {
2032                           case ANSI('3', '#'): /* DECDHL: 2*height, top */
2033                             nlattr = LATTR_TOP;
2034                             break;
2035                           case ANSI('4', '#'): /* DECDHL: 2*height, bottom */
2036                             nlattr = LATTR_BOT;
2037                             break;
2038                           case ANSI('5', '#'): /* DECSWL: normal */
2039                             nlattr = LATTR_NORM;
2040                             break;
2041                           default: /* case ANSI('6', '#'): DECDWL: 2*width */
2042                             nlattr = LATTR_WIDE;
2043                             break;
2044                         }
2045                         ldata = lineptr(term->curs.y);
2046                         ldata[term->cols] &= ~LATTR_MODE;
2047                         ldata[term->cols] |= nlattr;
2048                     }
2049                     break;
2050                   /* GZD4: G0 designate 94-set */
2051                   case ANSI('A', '('):
2052                     compatibility(VT100);
2053                     if (!term->cfg.no_remote_charset)
2054                         term->cset_attr[0] = ATTR_GBCHR;
2055                     break;
2056                   case ANSI('B', '('):
2057                     compatibility(VT100);
2058                     if (!term->cfg.no_remote_charset)
2059                         term->cset_attr[0] = ATTR_ASCII;
2060                     break;
2061                   case ANSI('0', '('):
2062                     compatibility(VT100);
2063                     if (!term->cfg.no_remote_charset)
2064                         term->cset_attr[0] = ATTR_LINEDRW;
2065                     break;
2066                   case ANSI('U', '('):
2067                     compatibility(OTHER);
2068                     if (!term->cfg.no_remote_charset)
2069                         term->cset_attr[0] = ATTR_SCOACS;
2070                     break;
2071                   /* G1D4: G1-designate 94-set */
2072                   case ANSI('A', ')'):
2073                     compatibility(VT100);
2074                     if (!term->cfg.no_remote_charset)
2075                         term->cset_attr[1] = ATTR_GBCHR;
2076                     break;
2077                   case ANSI('B', ')'):
2078                     compatibility(VT100);
2079                     if (!term->cfg.no_remote_charset)
2080                         term->cset_attr[1] = ATTR_ASCII;
2081                     break;
2082                   case ANSI('0', ')'):
2083                     compatibility(VT100);
2084                     if (!term->cfg.no_remote_charset)
2085                         term->cset_attr[1] = ATTR_LINEDRW;
2086                     break;
2087                   case ANSI('U', ')'):
2088                     compatibility(OTHER);
2089                     if (!term->cfg.no_remote_charset)
2090                         term->cset_attr[1] = ATTR_SCOACS;
2091                     break;
2092                   /* DOCS: Designate other coding system */
2093                   case ANSI('8', '%'):  /* Old Linux code */
2094                   case ANSI('G', '%'):
2095                     compatibility(OTHER);
2096                     if (!term->cfg.no_remote_charset)
2097                         term->utf = 1;
2098                     break;
2099                   case ANSI('@', '%'):
2100                     compatibility(OTHER);
2101                     if (!term->cfg.no_remote_charset)
2102                         term->utf = 0;
2103                     break;
2104                 }
2105                 break;
2106               case SEEN_CSI:
2107                 term->termstate = TOPLEVEL;  /* default */
2108                 if (isdigit(c)) {
2109                     if (term->esc_nargs <= ARGS_MAX) {
2110                         if (term->esc_args[term->esc_nargs - 1] == ARG_DEFAULT)
2111                             term->esc_args[term->esc_nargs - 1] = 0;
2112                         term->esc_args[term->esc_nargs - 1] =
2113                             10 * term->esc_args[term->esc_nargs - 1] + c - '0';
2114                     }
2115                     term->termstate = SEEN_CSI;
2116                 } else if (c == ';') {
2117                     if (++term->esc_nargs <= ARGS_MAX)
2118                         term->esc_args[term->esc_nargs - 1] = ARG_DEFAULT;
2119                     term->termstate = SEEN_CSI;
2120                 } else if (c < '@') {
2121                     if (term->esc_query)
2122                         term->esc_query = -1;
2123                     else if (c == '?')
2124                         term->esc_query = TRUE;
2125                     else
2126                         term->esc_query = c;
2127                     term->termstate = SEEN_CSI;
2128                 } else
2129                     switch (ANSI(c, term->esc_query)) {
2130                       case 'A':       /* CUU: move up N lines */
2131                         move(term, term->curs.x,
2132                              term->curs.y - def(term->esc_args[0], 1), 1);
2133                         term->seen_disp_event = TRUE;
2134                         break;
2135                       case 'e':         /* VPR: move down N lines */
2136                         compatibility(ANSI);
2137                         /* FALLTHROUGH */
2138                       case 'B':         /* CUD: Cursor down */
2139                         move(term, term->curs.x,
2140                              term->curs.y + def(term->esc_args[0], 1), 1);
2141                         term->seen_disp_event = TRUE;
2142                         break;
2143                       case ANSI('c', '>'):      /* DA: report xterm version */
2144                         compatibility(OTHER);
2145                         /* this reports xterm version 136 so that VIM can
2146                            use the drag messages from the mouse reporting */
2147                         if (term->ldisc)
2148                             ldisc_send(term->ldisc, "\033[>0;136;0c", 11, 0);
2149                         break;
2150                       case 'a':         /* HPR: move right N cols */
2151                         compatibility(ANSI);
2152                         /* FALLTHROUGH */
2153                       case 'C':         /* CUF: Cursor right */
2154                         move(term, term->curs.x + def(term->esc_args[0], 1),
2155                              term->curs.y, 1);
2156                         term->seen_disp_event = TRUE;
2157                         break;
2158                       case 'D':       /* CUB: move left N cols */
2159                         move(term, term->curs.x - def(term->esc_args[0], 1),
2160                              term->curs.y, 1);
2161                         term->seen_disp_event = TRUE;
2162                         break;
2163                       case 'E':       /* CNL: move down N lines and CR */
2164                         compatibility(ANSI);
2165                         move(term, 0,
2166                              term->curs.y + def(term->esc_args[0], 1), 1);
2167                         term->seen_disp_event = TRUE;
2168                         break;
2169                       case 'F':       /* CPL: move up N lines and CR */
2170                         compatibility(ANSI);
2171                         move(term, 0,
2172                              term->curs.y - def(term->esc_args[0], 1), 1);
2173                         term->seen_disp_event = TRUE;
2174                         break;
2175                       case 'G':       /* CHA */
2176                       case '`':       /* HPA: set horizontal posn */
2177                         compatibility(ANSI);
2178                         move(term, def(term->esc_args[0], 1) - 1,
2179                              term->curs.y, 0);
2180                         term->seen_disp_event = TRUE;
2181                         break;
2182                       case 'd':       /* VPA: set vertical posn */
2183                         compatibility(ANSI);
2184                         move(term, term->curs.x,
2185                              ((term->dec_om ? term->marg_t : 0) +
2186                               def(term->esc_args[0], 1) - 1),
2187                              (term->dec_om ? 2 : 0));
2188                         term->seen_disp_event = TRUE;
2189                         break;
2190                       case 'H':      /* CUP */
2191                       case 'f':      /* HVP: set horz and vert posns at once */
2192                         if (term->esc_nargs < 2)
2193                             term->esc_args[1] = ARG_DEFAULT;
2194                         move(term, def(term->esc_args[1], 1) - 1,
2195                              ((term->dec_om ? term->marg_t : 0) +
2196                               def(term->esc_args[0], 1) - 1),
2197                              (term->dec_om ? 2 : 0));
2198                         term->seen_disp_event = TRUE;
2199                         break;
2200                       case 'J':       /* ED: erase screen or parts of it */
2201                         {
2202                             unsigned int i = def(term->esc_args[0], 0) + 1;
2203                             if (i > 3)
2204                                 i = 0;
2205                             erase_lots(term, FALSE, !!(i & 2), !!(i & 1));
2206                         }
2207                         term->disptop = 0;
2208                         term->seen_disp_event = TRUE;
2209                         break;
2210                       case 'K':       /* EL: erase line or parts of it */
2211                         {
2212                             unsigned int i = def(term->esc_args[0], 0) + 1;
2213                             if (i > 3)
2214                                 i = 0;
2215                             erase_lots(term, TRUE, !!(i & 2), !!(i & 1));
2216                         }
2217                         term->seen_disp_event = TRUE;
2218                         break;
2219                       case 'L':       /* IL: insert lines */
2220                         compatibility(VT102);
2221                         if (term->curs.y <= term->marg_b)
2222                             scroll(term, term->curs.y, term->marg_b,
2223                                    -def(term->esc_args[0], 1), FALSE);
2224                         fix_cpos;
2225                         term->seen_disp_event = TRUE;
2226                         break;
2227                       case 'M':       /* DL: delete lines */
2228                         compatibility(VT102);
2229                         if (term->curs.y <= term->marg_b)
2230                             scroll(term, term->curs.y, term->marg_b,
2231                                    def(term->esc_args[0], 1),
2232                                    TRUE);
2233                         fix_cpos;
2234                         term->seen_disp_event = TRUE;
2235                         break;
2236                       case '@':       /* ICH: insert chars */
2237                         /* XXX VTTEST says this is vt220, vt510 manual says vt102 */
2238                         compatibility(VT102);
2239                         insch(term, def(term->esc_args[0], 1));
2240                         term->seen_disp_event = TRUE;
2241                         break;
2242                       case 'P':       /* DCH: delete chars */
2243                         compatibility(VT102);
2244                         insch(term, -def(term->esc_args[0], 1));
2245                         term->seen_disp_event = TRUE;
2246                         break;
2247                       case 'c':       /* DA: terminal type query */
2248                         compatibility(VT100);
2249                         /* This is the response for a VT102 */
2250                         if (term->ldisc)
2251                             ldisc_send(term->ldisc, term->id_string,
2252                                        strlen(term->id_string), 0);
2253                         break;
2254                       case 'n':       /* DSR: cursor position query */
2255                         if (term->ldisc) {
2256                             if (term->esc_args[0] == 6) {
2257                                 char buf[32];
2258                                 sprintf(buf, "\033[%d;%dR", term->curs.y + 1,
2259                                         term->curs.x + 1);
2260                                 ldisc_send(term->ldisc, buf, strlen(buf), 0);
2261                             } else if (term->esc_args[0] == 5) {
2262                                 ldisc_send(term->ldisc, "\033[0n", 4, 0);
2263                             }
2264                         }
2265                         break;
2266                       case 'h':       /* SM: toggle modes to high */
2267                       case ANSI_QUE('h'):
2268                         compatibility(VT100);
2269                         {
2270                             int i;
2271                             for (i = 0; i < term->esc_nargs; i++)
2272                                 toggle_mode(term, term->esc_args[i],
2273                                             term->esc_query, TRUE);
2274                         }
2275                         break;
2276                       case 'i':         /* MC: Media copy */
2277                       case ANSI_QUE('i'):
2278                         compatibility(VT100);
2279                         {
2280                             if (term->esc_nargs != 1) break;
2281                             if (term->esc_args[0] == 5 && *term->cfg.printer) {
2282                                 term->printing = TRUE;
2283                                 term->only_printing = !term->esc_query;
2284                                 term->print_state = 0;
2285                                 term_print_setup(term);
2286                             } else if (term->esc_args[0] == 4 &&
2287                                        term->printing) {
2288                                 term_print_finish(term);
2289                             }
2290                         }
2291                         break;
2292                       case 'l':       /* RM: toggle modes to low */
2293                       case ANSI_QUE('l'):
2294                         compatibility(VT100);
2295                         {
2296                             int i;
2297                             for (i = 0; i < term->esc_nargs; i++)
2298                                 toggle_mode(term, term->esc_args[i],
2299                                             term->esc_query, FALSE);
2300                         }
2301                         break;
2302                       case 'g':       /* TBC: clear tabs */
2303                         compatibility(VT100);
2304                         if (term->esc_nargs == 1) {
2305                             if (term->esc_args[0] == 0) {
2306                                 term->tabs[term->curs.x] = FALSE;
2307                             } else if (term->esc_args[0] == 3) {
2308                                 int i;
2309                                 for (i = 0; i < term->cols; i++)
2310                                     term->tabs[i] = FALSE;
2311                             }
2312                         }
2313                         break;
2314                       case 'r':       /* DECSTBM: set scroll margins */
2315                         compatibility(VT100);
2316                         if (term->esc_nargs <= 2) {
2317                             int top, bot;
2318                             top = def(term->esc_args[0], 1) - 1;
2319                             bot = (term->esc_nargs <= 1
2320                                    || term->esc_args[1] == 0 ?
2321                                    term->rows :
2322                                    def(term->esc_args[1], term->rows)) - 1;
2323                             if (bot >= term->rows)
2324                                 bot = term->rows - 1;
2325                             /* VTTEST Bug 9 - if region is less than 2 lines
2326                              * don't change region.
2327                              */
2328                             if (bot - top > 0) {
2329                                 term->marg_t = top;
2330                                 term->marg_b = bot;
2331                                 term->curs.x = 0;
2332                                 /*
2333                                  * I used to think the cursor should be
2334                                  * placed at the top of the newly marginned
2335                                  * area. Apparently not: VMS TPU falls over
2336                                  * if so.
2337                                  *
2338                                  * Well actually it should for
2339                                  * Origin mode - RDB
2340                                  */
2341                                 term->curs.y = (term->dec_om ?
2342                                                 term->marg_t : 0);
2343                                 fix_cpos;
2344                                 term->seen_disp_event = TRUE;
2345                             }
2346                         }
2347                         break;
2348                       case 'm':       /* SGR: set graphics rendition */
2349                         {
2350                             /*
2351                              * A VT100 without the AVO only had one
2352                              * attribute, either underline or
2353                              * reverse video depending on the
2354                              * cursor type, this was selected by
2355                              * CSI 7m.
2356                              *
2357                              * case 2:
2358                              *  This is sometimes DIM, eg on the
2359                              *  GIGI and Linux
2360                              * case 8:
2361                              *  This is sometimes INVIS various ANSI.
2362                              * case 21:
2363                              *  This like 22 disables BOLD, DIM and INVIS
2364                              *
2365                              * The ANSI colours appear on any
2366                              * terminal that has colour (obviously)
2367                              * but the interaction between sgr0 and
2368                              * the colours varies but is usually
2369                              * related to the background colour
2370                              * erase item. The interaction between
2371                              * colour attributes and the mono ones
2372                              * is also very implementation
2373                              * dependent.
2374                              *
2375                              * The 39 and 49 attributes are likely
2376                              * to be unimplemented.
2377                              */
2378                             int i;
2379                             for (i = 0; i < term->esc_nargs; i++) {
2380                                 switch (def(term->esc_args[i], 0)) {
2381                                   case 0:       /* restore defaults */
2382                                     term->curr_attr = term->default_attr;
2383                                     break;
2384                                   case 1:       /* enable bold */
2385                                     compatibility(VT100AVO);
2386                                     term->curr_attr |= ATTR_BOLD;
2387                                     break;
2388                                   case 21:      /* (enable double underline) */
2389                                     compatibility(OTHER);
2390                                   case 4:       /* enable underline */
2391                                     compatibility(VT100AVO);
2392                                     term->curr_attr |= ATTR_UNDER;
2393                                     break;
2394                                   case 5:       /* enable blink */
2395                                     compatibility(VT100AVO);
2396                                     term->curr_attr |= ATTR_BLINK;
2397                                     break;
2398                                   case 6:       /* SCO light bkgrd */
2399                                     compatibility(SCOANSI);
2400                                     term->blink_is_real = FALSE;
2401                                     term->curr_attr |= ATTR_BLINK;
2402                                     break;
2403                                   case 7:       /* enable reverse video */
2404                                     term->curr_attr |= ATTR_REVERSE;
2405                                     break;
2406                                   case 10:      /* SCO acs off */
2407                                     compatibility(SCOANSI);
2408                                     if (term->cfg.no_remote_charset) break;
2409                                     term->sco_acs = 0; break;
2410                                   case 11:      /* SCO acs on */
2411                                     compatibility(SCOANSI);
2412                                     if (term->cfg.no_remote_charset) break;
2413                                     term->sco_acs = 1; break;
2414                                   case 12:      /* SCO acs on, |0x80 */
2415                                     compatibility(SCOANSI);
2416                                     if (term->cfg.no_remote_charset) break;
2417                                     term->sco_acs = 2; break;
2418                                   case 22:      /* disable bold */
2419                                     compatibility2(OTHER, VT220);
2420                                     term->curr_attr &= ~ATTR_BOLD;
2421                                     break;
2422                                   case 24:      /* disable underline */
2423                                     compatibility2(OTHER, VT220);
2424                                     term->curr_attr &= ~ATTR_UNDER;
2425                                     break;
2426                                   case 25:      /* disable blink */
2427                                     compatibility2(OTHER, VT220);
2428                                     term->curr_attr &= ~ATTR_BLINK;
2429                                     break;
2430                                   case 27:      /* disable reverse video */
2431                                     compatibility2(OTHER, VT220);
2432                                     term->curr_attr &= ~ATTR_REVERSE;
2433                                     break;
2434                                   case 30:
2435                                   case 31:
2436                                   case 32:
2437                                   case 33:
2438                                   case 34:
2439                                   case 35:
2440                                   case 36:
2441                                   case 37:
2442                                     /* foreground */
2443                                     term->curr_attr &= ~ATTR_FGMASK;
2444                                     term->curr_attr |=
2445                                         (term->esc_args[i] - 30)<<ATTR_FGSHIFT;
2446                                     break;
2447                                   case 90:
2448                                   case 91:
2449                                   case 92:
2450                                   case 93:
2451                                   case 94:
2452                                   case 95:
2453                                   case 96:
2454                                   case 97:
2455                                     /* xterm-style bright foreground */
2456                                     term->curr_attr &= ~ATTR_FGMASK;
2457                                     term->curr_attr |=
2458                                         ((term->esc_args[i] - 90 + 16)
2459                                          << ATTR_FGSHIFT);
2460                                     break;
2461                                   case 39:      /* default-foreground */
2462                                     term->curr_attr &= ~ATTR_FGMASK;
2463                                     term->curr_attr |= ATTR_DEFFG;
2464                                     break;
2465                                   case 40:
2466                                   case 41:
2467                                   case 42:
2468                                   case 43:
2469                                   case 44:
2470                                   case 45:
2471                                   case 46:
2472                                   case 47:
2473                                     /* background */
2474                                     term->curr_attr &= ~ATTR_BGMASK;
2475                                     term->curr_attr |=
2476                                         (term->esc_args[i] - 40)<<ATTR_BGSHIFT;
2477                                     break;
2478                                   case 100:
2479                                   case 101:
2480                                   case 102:
2481                                   case 103:
2482                                   case 104:
2483                                   case 105:
2484                                   case 106:
2485                                   case 107:
2486                                     /* xterm-style bright background */
2487                                     term->curr_attr &= ~ATTR_BGMASK;
2488                                     term->curr_attr |=
2489                                         ((term->esc_args[i] - 100 + 16)
2490                                          << ATTR_BGSHIFT);
2491                                     break;
2492                                   case 49:      /* default-background */
2493                                     term->curr_attr &= ~ATTR_BGMASK;
2494                                     term->curr_attr |= ATTR_DEFBG;
2495                                     break;
2496                                 }
2497                             }
2498                             if (term->use_bce)
2499                                 term->erase_char = (' ' | ATTR_ASCII |
2500                                                     (term->curr_attr &
2501                                                      (ATTR_FGMASK |
2502                                                       ATTR_BGMASK)));
2503                         }
2504                         break;
2505                       case 's':       /* save cursor */
2506                         save_cursor(term, TRUE);
2507                         break;
2508                       case 'u':       /* restore cursor */
2509                         save_cursor(term, FALSE);
2510                         term->seen_disp_event = TRUE;
2511                         break;
2512                       case 't': /* DECSLPP: set page size - ie window height */
2513                         /*
2514                          * VT340/VT420 sequence DECSLPP, DEC only allows values
2515                          *  24/25/36/48/72/144 other emulators (eg dtterm) use
2516                          * illegal values (eg first arg 1..9) for window changing
2517                          * and reports.
2518                          */
2519                         if (term->esc_nargs <= 1
2520                             && (term->esc_args[0] < 1 ||
2521                                 term->esc_args[0] >= 24)) {
2522                             compatibility(VT340TEXT);
2523                             if (!term->cfg.no_remote_resize)
2524                                 request_resize(term->frontend, term->cols,
2525                                                def(term->esc_args[0], 24));
2526                             deselect(term);
2527                         } else if (term->esc_nargs >= 1 &&
2528                                    term->esc_args[0] >= 1 &&
2529                                    term->esc_args[0] < 24) {
2530                             compatibility(OTHER);
2531
2532                             switch (term->esc_args[0]) {
2533                                 int x, y, len;
2534                                 char buf[80], *p;
2535                               case 1:
2536                                 set_iconic(term->frontend, FALSE);
2537                                 break;
2538                               case 2:
2539                                 set_iconic(term->frontend, TRUE);
2540                                 break;
2541                               case 3:
2542                                 if (term->esc_nargs >= 3) {
2543                                     if (!term->cfg.no_remote_resize)
2544                                         move_window(term->frontend,
2545                                                     def(term->esc_args[1], 0),
2546                                                     def(term->esc_args[2], 0));
2547                                 }
2548                                 break;
2549                               case 4:
2550                                 /* We should resize the window to a given
2551                                  * size in pixels here, but currently our
2552                                  * resizing code isn't healthy enough to
2553                                  * manage it. */
2554                                 break;
2555                               case 5:
2556                                 /* move to top */
2557                                 set_zorder(term->frontend, TRUE);
2558                                 break;
2559                               case 6:
2560                                 /* move to bottom */
2561                                 set_zorder(term->frontend, FALSE);
2562                                 break;
2563                               case 7:
2564                                 refresh_window(term->frontend);
2565                                 break;
2566                               case 8:
2567                                 if (term->esc_nargs >= 3) {
2568                                     if (!term->cfg.no_remote_resize)
2569                                         request_resize(term->frontend,
2570                                                        def(term->esc_args[2], term->cfg.width),
2571                                                        def(term->esc_args[1], term->cfg.height));
2572                                 }
2573                                 break;
2574                               case 9:
2575                                 if (term->esc_nargs >= 2)
2576                                     set_zoomed(term->frontend,
2577                                                term->esc_args[1] ?
2578                                                TRUE : FALSE);
2579                                 break;
2580                               case 11:
2581                                 if (term->ldisc)
2582                                     ldisc_send(term->ldisc,
2583                                                is_iconic(term->frontend) ?
2584                                                "\033[1t" : "\033[2t", 4, 0);
2585                                 break;
2586                               case 13:
2587                                 if (term->ldisc) {
2588                                     get_window_pos(term->frontend, &x, &y);
2589                                     len = sprintf(buf, "\033[3;%d;%dt", x, y);
2590                                     ldisc_send(term->ldisc, buf, len, 0);
2591                                 }
2592                                 break;
2593                               case 14:
2594                                 if (term->ldisc) {
2595                                     get_window_pixels(term->frontend, &x, &y);
2596                                     len = sprintf(buf, "\033[4;%d;%dt", x, y);
2597                                     ldisc_send(term->ldisc, buf, len, 0);
2598                                 }
2599                                 break;
2600                               case 18:
2601                                 if (term->ldisc) {
2602                                     len = sprintf(buf, "\033[8;%d;%dt",
2603                                                   term->rows, term->cols);
2604                                     ldisc_send(term->ldisc, buf, len, 0);
2605                                 }
2606                                 break;
2607                               case 19:
2608                                 /*
2609                                  * Hmmm. Strictly speaking we
2610                                  * should return `the size of the
2611                                  * screen in characters', but
2612                                  * that's not easy: (a) window
2613                                  * furniture being what it is it's
2614                                  * hard to compute, and (b) in
2615                                  * resize-font mode maximising the
2616                                  * window wouldn't change the
2617                                  * number of characters. *shrug*. I
2618                                  * think we'll ignore it for the
2619                                  * moment and see if anyone
2620                                  * complains, and then ask them
2621                                  * what they would like it to do.
2622                                  */
2623                                 break;
2624                               case 20:
2625                                 if (term->ldisc &&
2626                                     !term->cfg.no_remote_qtitle) {
2627                                     p = get_window_title(term->frontend, TRUE);
2628                                     len = strlen(p);
2629                                     ldisc_send(term->ldisc, "\033]L", 3, 0);
2630                                     ldisc_send(term->ldisc, p, len, 0);
2631                                     ldisc_send(term->ldisc, "\033\\", 2, 0);
2632                                 }
2633                                 break;
2634                               case 21:
2635                                 if (term->ldisc &&
2636                                     !term->cfg.no_remote_qtitle) {
2637                                     p = get_window_title(term->frontend,FALSE);
2638                                     len = strlen(p);
2639                                     ldisc_send(term->ldisc, "\033]l", 3, 0);
2640                                     ldisc_send(term->ldisc, p, len, 0);
2641                                     ldisc_send(term->ldisc, "\033\\", 2, 0);
2642                                 }
2643                                 break;
2644                             }
2645                         }
2646                         break;
2647                       case 'S':         /* SU: Scroll up */
2648                         compatibility(SCOANSI);
2649                         scroll(term, term->marg_t, term->marg_b,
2650                                def(term->esc_args[0], 1), TRUE);
2651                         fix_cpos;
2652                         term->wrapnext = FALSE;
2653                         term->seen_disp_event = TRUE;
2654                         break;
2655                       case 'T':         /* SD: Scroll down */
2656                         compatibility(SCOANSI);
2657                         scroll(term, term->marg_t, term->marg_b,
2658                                -def(term->esc_args[0], 1), TRUE);
2659                         fix_cpos;
2660                         term->wrapnext = FALSE;
2661                         term->seen_disp_event = TRUE;
2662                         break;
2663                       case ANSI('|', '*'): /* DECSNLS */
2664                         /*
2665                          * Set number of lines on screen
2666                          * VT420 uses VGA like hardware and can
2667                          * support any size in reasonable range
2668                          * (24..49 AIUI) with no default specified.
2669                          */
2670                         compatibility(VT420);
2671                         if (term->esc_nargs == 1 && term->esc_args[0] > 0) {
2672                             if (!term->cfg.no_remote_resize)
2673                                 request_resize(term->frontend, term->cols,
2674                                                def(term->esc_args[0],
2675                                                    term->cfg.height));
2676                             deselect(term);
2677                         }
2678                         break;
2679                       case ANSI('|', '$'): /* DECSCPP */
2680                         /*
2681                          * Set number of columns per page
2682                          * Docs imply range is only 80 or 132, but
2683                          * I'll allow any.
2684                          */
2685                         compatibility(VT340TEXT);
2686                         if (term->esc_nargs <= 1) {
2687                             if (!term->cfg.no_remote_resize)
2688                                 request_resize(term->frontend,
2689                                                def(term->esc_args[0],
2690                                                    term->cfg.width), term->rows);
2691                             deselect(term);
2692                         }
2693                         break;
2694                       case 'X':     /* ECH: write N spaces w/o moving cursor */
2695                         /* XXX VTTEST says this is vt220, vt510 manual
2696                          * says vt100 */
2697                         compatibility(ANSIMIN);
2698                         {
2699                             int n = def(term->esc_args[0], 1);
2700                             pos cursplus;
2701                             unsigned long *p = term->cpos;
2702                             if (n > term->cols - term->curs.x)
2703                                 n = term->cols - term->curs.x;
2704                             cursplus = term->curs;
2705                             cursplus.x += n;
2706                             check_boundary(term, term->curs.x, term->curs.y);
2707                             check_boundary(term, term->curs.x+n, term->curs.y);
2708                             check_selection(term, term->curs, cursplus);
2709                             while (n--)
2710                                 *p++ = term->erase_char;
2711                             term->seen_disp_event = TRUE;
2712                         }
2713                         break;
2714                       case 'x':       /* DECREQTPARM: report terminal characteristics */
2715                         compatibility(VT100);
2716                         if (term->ldisc) {
2717                             char buf[32];
2718                             int i = def(term->esc_args[0], 0);
2719                             if (i == 0 || i == 1) {
2720                                 strcpy(buf, "\033[2;1;1;112;112;1;0x");
2721                                 buf[2] += i;
2722                                 ldisc_send(term->ldisc, buf, 20, 0);
2723                             }
2724                         }
2725                         break;
2726                       case 'Z':         /* CBT: BackTab for xterm */
2727                         compatibility(OTHER);
2728                         {
2729                             int i = def(term->esc_args[0], 1);
2730                             pos old_curs = term->curs;
2731
2732                             for(;i>0 && term->curs.x>0; i--) {
2733                                 do {
2734                                     term->curs.x--;
2735                                 } while (term->curs.x >0 &&
2736                                          !term->tabs[term->curs.x]);
2737                             }
2738                             fix_cpos;
2739                             check_selection(term, old_curs, term->curs);
2740                         }
2741                         break;
2742                       case ANSI('c', '='):      /* Hide or Show Cursor */
2743                         compatibility(SCOANSI);
2744                         switch(term->esc_args[0]) {
2745                           case 0:  /* hide cursor */
2746                             term->cursor_on = FALSE;
2747                             break;
2748                           case 1:  /* restore cursor */
2749                             term->big_cursor = FALSE;
2750                             term->cursor_on = TRUE;
2751                             break;
2752                           case 2:  /* block cursor */
2753                             term->big_cursor = TRUE;
2754                             term->cursor_on = TRUE;
2755                             break;
2756                         }
2757                         break;
2758                       case ANSI('C', '='):
2759                         /*
2760                          * set cursor start on scanline esc_args[0] and
2761                          * end on scanline esc_args[1].If you set
2762                          * the bottom scan line to a value less than
2763                          * the top scan line, the cursor will disappear.
2764                          */
2765                         compatibility(SCOANSI);
2766                         if (term->esc_nargs >= 2) {
2767                             if (term->esc_args[0] > term->esc_args[1])
2768                                 term->cursor_on = FALSE;
2769                             else
2770                                 term->cursor_on = TRUE;
2771                         }
2772                         break;
2773                       case ANSI('D', '='):
2774                         compatibility(SCOANSI);
2775                         term->blink_is_real = FALSE;
2776                         if (term->esc_args[0]>=1)
2777                             term->curr_attr |= ATTR_BLINK;
2778                         else
2779                             term->curr_attr &= ~ATTR_BLINK;
2780                         break;
2781                       case ANSI('E', '='):
2782                         compatibility(SCOANSI);
2783                         term->blink_is_real = (term->esc_args[0] >= 1);
2784                         break;
2785                       case ANSI('F', '='):      /* set normal foreground */
2786                         compatibility(SCOANSI);
2787                         if (term->esc_args[0] >= 0 && term->esc_args[0] < 16) {
2788                             long colour =
2789                                 (sco2ansicolour[term->esc_args[0] & 0x7] |
2790                                  ((term->esc_args[0] & 0x8) << 1)) <<
2791                                 ATTR_FGSHIFT;
2792                             term->curr_attr &= ~ATTR_FGMASK;
2793                             term->curr_attr |= colour;
2794                             term->default_attr &= ~ATTR_FGMASK;
2795                             term->default_attr |= colour;
2796                         }
2797                         break;
2798                       case ANSI('G', '='):      /* set normal background */
2799                         compatibility(SCOANSI);
2800                         if (term->esc_args[0] >= 0 && term->esc_args[0] < 16) {
2801                             long colour =
2802                                 (sco2ansicolour[term->esc_args[0] & 0x7] |
2803                                  ((term->esc_args[0] & 0x8) << 1)) <<
2804                                 ATTR_BGSHIFT;
2805                             term->curr_attr &= ~ATTR_BGMASK;
2806                             term->curr_attr |= colour;
2807                             term->default_attr &= ~ATTR_BGMASK;
2808                             term->default_attr |= colour;
2809                         }
2810                         break;
2811                       case ANSI('L', '='):
2812                         compatibility(SCOANSI);
2813                         term->use_bce = (term->esc_args[0] <= 0);
2814                         term->erase_char = ERASE_CHAR;
2815                         if (term->use_bce)
2816                             term->erase_char = (' ' | ATTR_ASCII |
2817                                                 (term->curr_attr &
2818                                                  (ATTR_FGMASK | ATTR_BGMASK)));
2819                         break;
2820                       case ANSI('p', '"'): /* DECSCL: set compat level */
2821                         /*
2822                          * Allow the host to make this emulator a
2823                          * 'perfect' VT102. This first appeared in
2824                          * the VT220, but we do need to get back to
2825                          * PuTTY mode so I won't check it.
2826                          *
2827                          * The arg in 40..42,50 are a PuTTY extension.
2828                          * The 2nd arg, 8bit vs 7bit is not checked.
2829                          *
2830                          * Setting VT102 mode should also change
2831                          * the Fkeys to generate PF* codes as a
2832                          * real VT102 has no Fkeys. The VT220 does
2833                          * this, F11..F13 become ESC,BS,LF other
2834                          * Fkeys send nothing.
2835                          *
2836                          * Note ESC c will NOT change this!
2837                          */
2838
2839                         switch (term->esc_args[0]) {
2840                           case 61:
2841                             term->compatibility_level &= ~TM_VTXXX;
2842                             term->compatibility_level |= TM_VT102;
2843                             break;
2844                           case 62:
2845                             term->compatibility_level &= ~TM_VTXXX;
2846                             term->compatibility_level |= TM_VT220;
2847                             break;
2848
2849                           default:
2850                             if (term->esc_args[0] > 60 &&
2851                                 term->esc_args[0] < 70)
2852                                 term->compatibility_level |= TM_VTXXX;
2853                             break;
2854
2855                           case 40:
2856                             term->compatibility_level &= TM_VTXXX;
2857                             break;
2858                           case 41:
2859                             term->compatibility_level = TM_PUTTY;
2860                             break;
2861                           case 42:
2862                             term->compatibility_level = TM_SCOANSI;
2863                             break;
2864
2865                           case ARG_DEFAULT:
2866                             term->compatibility_level = TM_PUTTY;
2867                             break;
2868                           case 50:
2869                             break;
2870                         }
2871
2872                         /* Change the response to CSI c */
2873                         if (term->esc_args[0] == 50) {
2874                             int i;
2875                             char lbuf[64];
2876                             strcpy(term->id_string, "\033[?");
2877                             for (i = 1; i < term->esc_nargs; i++) {
2878                                 if (i != 1)
2879                                     strcat(term->id_string, ";");
2880                                 sprintf(lbuf, "%d", term->esc_args[i]);
2881                                 strcat(term->id_string, lbuf);
2882                             }
2883                             strcat(term->id_string, "c");
2884                         }
2885 #if 0
2886                         /* Is this a good idea ?
2887                          * Well we should do a soft reset at this point ...
2888                          */
2889                         if (!has_compat(VT420) && has_compat(VT100)) {
2890                             if (!term->cfg.no_remote_resize) {
2891                                 if (term->reset_132)
2892                                     request_resize(132, 24);
2893                                 else
2894                                     request_resize(80, 24);
2895                             }
2896                         }
2897 #endif
2898                         break;
2899                     }
2900                 break;
2901               case SEEN_OSC:
2902                 term->osc_w = FALSE;
2903                 switch (c) {
2904                   case 'P':            /* Linux palette sequence */
2905                     term->termstate = SEEN_OSC_P;
2906                     term->osc_strlen = 0;
2907                     break;
2908                   case 'R':            /* Linux palette reset */
2909                     palette_reset(term->frontend);
2910                     term_invalidate(term);
2911                     term->termstate = TOPLEVEL;
2912                     break;
2913                   case 'W':            /* word-set */
2914                     term->termstate = SEEN_OSC_W;
2915                     term->osc_w = TRUE;
2916                     break;
2917                   case '0':
2918                   case '1':
2919                   case '2':
2920                   case '3':
2921                   case '4':
2922                   case '5':
2923                   case '6':
2924                   case '7':
2925                   case '8':
2926                   case '9':
2927                     term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
2928                     break;
2929                   case 'L':
2930                     /*
2931                      * Grotty hack to support xterm and DECterm title
2932                      * sequences concurrently.
2933                      */
2934                     if (term->esc_args[0] == 2) {
2935                         term->esc_args[0] = 1;
2936                         break;
2937                     }
2938                     /* else fall through */
2939                   default:
2940                     term->termstate = OSC_STRING;
2941                     term->osc_strlen = 0;
2942                 }
2943                 break;
2944               case OSC_STRING:
2945                 /*
2946                  * This OSC stuff is EVIL. It takes just one character to get into
2947                  * sysline mode and it's not initially obvious how to get out.
2948                  * So I've added CR and LF as string aborts.
2949                  * This shouldn't effect compatibility as I believe embedded
2950                  * control characters are supposed to be interpreted (maybe?)
2951                  * and they don't display anything useful anyway.
2952                  *
2953                  * -- RDB
2954                  */
2955                 if (c == '\012' || c == '\015') {
2956                     term->termstate = TOPLEVEL;
2957                 } else if (c == 0234 || c == '\007') {
2958                     /*
2959                      * These characters terminate the string; ST and BEL
2960                      * terminate the sequence and trigger instant
2961                      * processing of it, whereas ESC goes back to SEEN_ESC
2962                      * mode unless it is followed by \, in which case it is
2963                      * synonymous with ST in the first place.
2964                      */
2965                     do_osc(term);
2966                     term->termstate = TOPLEVEL;
2967                 } else if (c == '\033')
2968                     term->termstate = OSC_MAYBE_ST;
2969                 else if (term->osc_strlen < OSC_STR_MAX)
2970                     term->osc_string[term->osc_strlen++] = c;
2971                 break;
2972               case SEEN_OSC_P:
2973                 {
2974                     int max = (term->osc_strlen == 0 ? 21 : 16);
2975                     int val;
2976                     if (c >= '0' && c <= '9')
2977                         val = c - '0';
2978                     else if (c >= 'A' && c <= 'A' + max - 10)
2979                         val = c - 'A' + 10;
2980                     else if (c >= 'a' && c <= 'a' + max - 10)
2981                         val = c - 'a' + 10;
2982                     else {
2983                         term->termstate = TOPLEVEL;
2984                         break;
2985                     }
2986                     term->osc_string[term->osc_strlen++] = val;
2987                     if (term->osc_strlen >= 7) {
2988                         palette_set(term->frontend, term->osc_string[0],
2989                                     term->osc_string[1] * 16 + term->osc_string[2],
2990                                     term->osc_string[3] * 16 + term->osc_string[4],
2991                                     term->osc_string[5] * 16 + term->osc_string[6]);
2992                         term_invalidate(term);
2993                         term->termstate = TOPLEVEL;
2994                     }
2995                 }
2996                 break;
2997               case SEEN_OSC_W:
2998                 switch (c) {
2999                   case '0':
3000                   case '1':
3001                   case '2':
3002                   case '3':
3003                   case '4':
3004                   case '5':
3005                   case '6':
3006                   case '7':
3007                   case '8':
3008                   case '9':
3009                     term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
3010                     break;
3011                   default:
3012                     term->termstate = OSC_STRING;
3013                     term->osc_strlen = 0;
3014                 }
3015                 break;
3016               case VT52_ESC:
3017                 term->termstate = TOPLEVEL;
3018                 term->seen_disp_event = TRUE;
3019                 switch (c) {
3020                   case 'A':
3021                     move(term, term->curs.x, term->curs.y - 1, 1);
3022                     break;
3023                   case 'B':
3024                     move(term, term->curs.x, term->curs.y + 1, 1);
3025                     break;
3026                   case 'C':
3027                     move(term, term->curs.x + 1, term->curs.y, 1);
3028                     break;
3029                   case 'D':
3030                     move(term, term->curs.x - 1, term->curs.y, 1);
3031                     break;
3032                     /*
3033                      * From the VT100 Manual
3034                      * NOTE: The special graphics characters in the VT100
3035                      *       are different from those in the VT52
3036                      *
3037                      * From VT102 manual:
3038                      *       137 _  Blank             - Same
3039                      *       140 `  Reserved          - Humm.
3040                      *       141 a  Solid rectangle   - Similar
3041                      *       142 b  1/                - Top half of fraction for the
3042                      *       143 c  3/                - subscript numbers below.
3043                      *       144 d  5/
3044                      *       145 e  7/
3045                      *       146 f  Degrees           - Same
3046                      *       147 g  Plus or minus     - Same
3047                      *       150 h  Right arrow
3048                      *       151 i  Ellipsis (dots)
3049                      *       152 j  Divide by
3050                      *       153 k  Down arrow
3051                      *       154 l  Bar at scan 0
3052                      *       155 m  Bar at scan 1
3053                      *       156 n  Bar at scan 2
3054                      *       157 o  Bar at scan 3     - Similar
3055                      *       160 p  Bar at scan 4     - Similar
3056                      *       161 q  Bar at scan 5     - Similar
3057                      *       162 r  Bar at scan 6     - Same
3058                      *       163 s  Bar at scan 7     - Similar
3059                      *       164 t  Subscript 0
3060                      *       165 u  Subscript 1
3061                      *       166 v  Subscript 2
3062                      *       167 w  Subscript 3
3063                      *       170 x  Subscript 4
3064                      *       171 y  Subscript 5
3065                      *       172 z  Subscript 6
3066                      *       173 {  Subscript 7
3067                      *       174 |  Subscript 8
3068                      *       175 }  Subscript 9
3069                      *       176 ~  Paragraph
3070                      *
3071                      */
3072                   case 'F':
3073                     term->cset_attr[term->cset = 0] = ATTR_LINEDRW;
3074                     break;
3075                   case 'G':
3076                     term->cset_attr[term->cset = 0] = ATTR_ASCII;
3077                     break;
3078                   case 'H':
3079                     move(term, 0, 0, 0);
3080                     break;
3081                   case 'I':
3082                     if (term->curs.y == 0)
3083                         scroll(term, 0, term->rows - 1, -1, TRUE);
3084                     else if (term->curs.y > 0)
3085                         term->curs.y--;
3086                     fix_cpos;
3087                     term->wrapnext = FALSE;
3088                     break;
3089                   case 'J':
3090                     erase_lots(term, FALSE, FALSE, TRUE);
3091                     term->disptop = 0;
3092                     break;
3093                   case 'K':
3094                     erase_lots(term, TRUE, FALSE, TRUE);
3095                     break;
3096 #if 0
3097                   case 'V':
3098                     /* XXX Print cursor line */
3099                     break;
3100                   case 'W':
3101                     /* XXX Start controller mode */
3102                     break;
3103                   case 'X':
3104                     /* XXX Stop controller mode */
3105                     break;
3106 #endif
3107                   case 'Y':
3108                     term->termstate = VT52_Y1;
3109                     break;
3110                   case 'Z':
3111                     if (term->ldisc)
3112                         ldisc_send(term->ldisc, "\033/Z", 3, 0);
3113                     break;
3114                   case '=':
3115                     term->app_keypad_keys = TRUE;
3116                     break;
3117                   case '>':
3118                     term->app_keypad_keys = FALSE;
3119                     break;
3120                   case '<':
3121                     /* XXX This should switch to VT100 mode not current or default
3122                      *     VT mode. But this will only have effect in a VT220+
3123                      *     emulation.
3124                      */
3125                     term->vt52_mode = FALSE;
3126                     term->blink_is_real = term->cfg.blinktext;
3127                     break;
3128 #if 0
3129                   case '^':
3130                     /* XXX Enter auto print mode */
3131                     break;
3132                   case '_':
3133                     /* XXX Exit auto print mode */
3134                     break;
3135                   case ']':
3136                     /* XXX Print screen */
3137                     break;
3138 #endif
3139
3140 #ifdef VT52_PLUS
3141                   case 'E':
3142                     /* compatibility(ATARI) */
3143                     move(term, 0, 0, 0);
3144                     erase_lots(term, FALSE, FALSE, TRUE);
3145                     term->disptop = 0;
3146                     break;
3147                   case 'L':
3148                     /* compatibility(ATARI) */
3149                     if (term->curs.y <= term->marg_b)
3150                         scroll(term, term->curs.y, term->marg_b, -1, FALSE);
3151                     break;
3152                   case 'M':
3153                     /* compatibility(ATARI) */
3154                     if (term->curs.y <= term->marg_b)
3155                         scroll(term, term->curs.y, term->marg_b, 1, TRUE);
3156                     break;
3157                   case 'b':
3158                     /* compatibility(ATARI) */
3159                     term->termstate = VT52_FG;
3160                     break;
3161                   case 'c':
3162                     /* compatibility(ATARI) */
3163                     term->termstate = VT52_BG;
3164                     break;
3165                   case 'd':
3166                     /* compatibility(ATARI) */
3167                     erase_lots(term, FALSE, TRUE, FALSE);
3168                     term->disptop = 0;
3169                     break;
3170                   case 'e':
3171                     /* compatibility(ATARI) */
3172                     term->cursor_on = TRUE;
3173                     break;
3174                   case 'f':
3175                     /* compatibility(ATARI) */
3176                     term->cursor_on = FALSE;
3177                     break;
3178                     /* case 'j': Save cursor position - broken on ST */
3179                     /* case 'k': Restore cursor position */
3180                   case 'l':
3181                     /* compatibility(ATARI) */
3182                     erase_lots(term, TRUE, TRUE, TRUE);
3183                     term->curs.x = 0;
3184                     term->wrapnext = FALSE;
3185                     fix_cpos;
3186                     break;
3187                   case 'o':
3188                     /* compatibility(ATARI) */
3189                     erase_lots(term, TRUE, TRUE, FALSE);
3190                     break;
3191                   case 'p':
3192                     /* compatibility(ATARI) */
3193                     term->curr_attr |= ATTR_REVERSE;
3194                     break;
3195                   case 'q':
3196                     /* compatibility(ATARI) */
3197                     term->curr_attr &= ~ATTR_REVERSE;
3198                     break;
3199                   case 'v':            /* wrap Autowrap on - Wyse style */
3200                     /* compatibility(ATARI) */
3201                     term->wrap = 1;
3202                     break;
3203                   case 'w':            /* Autowrap off */
3204                     /* compatibility(ATARI) */
3205                     term->wrap = 0;
3206                     break;
3207
3208                   case 'R':
3209                     /* compatibility(OTHER) */
3210                     term->vt52_bold = FALSE;
3211                     term->curr_attr = ATTR_DEFAULT;
3212                     if (term->use_bce)
3213                         term->erase_char = (' ' | ATTR_ASCII |
3214                                             (term->curr_attr &
3215                                              (ATTR_FGMASK | ATTR_BGMASK)));
3216                     break;
3217                   case 'S':
3218                     /* compatibility(VI50) */
3219                     term->curr_attr |= ATTR_UNDER;
3220                     break;
3221                   case 'W':
3222                     /* compatibility(VI50) */
3223                     term->curr_attr &= ~ATTR_UNDER;
3224                     break;
3225                   case 'U':
3226                     /* compatibility(VI50) */
3227                     term->vt52_bold = TRUE;
3228                     term->curr_attr |= ATTR_BOLD;
3229                     break;
3230                   case 'T':
3231                     /* compatibility(VI50) */
3232                     term->vt52_bold = FALSE;
3233                     term->curr_attr &= ~ATTR_BOLD;
3234                     break;
3235 #endif
3236                 }
3237                 break;
3238               case VT52_Y1:
3239                 term->termstate = VT52_Y2;
3240                 move(term, term->curs.x, c - ' ', 0);
3241                 break;
3242               case VT52_Y2:
3243                 term->termstate = TOPLEVEL;
3244                 move(term, c - ' ', term->curs.y, 0);
3245                 break;
3246
3247 #ifdef VT52_PLUS
3248               case VT52_FG:
3249                 term->termstate = TOPLEVEL;
3250                 term->curr_attr &= ~ATTR_FGMASK;
3251                 term->curr_attr &= ~ATTR_BOLD;
3252                 term->curr_attr |= (c & 0x7) << ATTR_FGSHIFT;
3253                 if ((c & 0x8) || term->vt52_bold)
3254                     term->curr_attr |= ATTR_BOLD;
3255
3256                 if (term->use_bce)
3257                     term->erase_char = (' ' | ATTR_ASCII |
3258                                         (term->curr_attr &
3259                                          (ATTR_FGMASK | ATTR_BGMASK)));
3260                 break;
3261               case VT52_BG:
3262                 term->termstate = TOPLEVEL;
3263                 term->curr_attr &= ~ATTR_BGMASK;
3264                 term->curr_attr &= ~ATTR_BLINK;
3265                 term->curr_attr |= (c & 0x7) << ATTR_BGSHIFT;
3266
3267                 /* Note: bold background */
3268                 if (c & 0x8)
3269                     term->curr_attr |= ATTR_BLINK;
3270
3271                 if (term->use_bce)
3272                     term->erase_char = (' ' | ATTR_ASCII |
3273                                         (term->curr_attr &
3274                                          (ATTR_FGMASK | ATTR_BGMASK)));
3275                 break;
3276 #endif
3277               default: break;          /* placate gcc warning about enum use */
3278             }
3279         if (term->selstate != NO_SELECTION) {
3280             pos cursplus = term->curs;
3281             incpos(cursplus);
3282             check_selection(term, term->curs, cursplus);
3283         }
3284     }
3285
3286     term_print_flush(term);
3287 }
3288
3289 #if 0
3290 /*
3291  * Compare two lines to determine whether they are sufficiently
3292  * alike to scroll-optimise one to the other. Return the degree of
3293  * similarity.
3294  */
3295 static int linecmp(Terminal *term, unsigned long *a, unsigned long *b)
3296 {
3297     int i, n;
3298
3299     for (i = n = 0; i < term->cols; i++)
3300         n += (*a++ == *b++);
3301     return n;
3302 }
3303 #endif
3304
3305 /*
3306  * Given a context, update the window. Out of paranoia, we don't
3307  * allow WM_PAINT responses to do scrolling optimisations.
3308  */
3309 static void do_paint(Terminal *term, Context ctx, int may_optimise)
3310 {
3311     int i, j, our_curs_y, our_curs_x;
3312     unsigned long rv, cursor;
3313     pos scrpos;
3314     char ch[1024];
3315     long cursor_background = ERASE_CHAR;
3316     unsigned long ticks;
3317 #ifdef OPTIMISE_SCROLL
3318     struct scrollregion *sr;
3319 #endif /* OPTIMISE_SCROLL */
3320
3321     /*
3322      * Check the visual bell state.
3323      */
3324     if (term->in_vbell) {
3325         ticks = GETTICKCOUNT();
3326         if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
3327             term->in_vbell = FALSE;
3328    }
3329
3330     rv = (!term->rvideo ^ !term->in_vbell ? ATTR_REVERSE : 0);
3331
3332     /* Depends on:
3333      * screen array, disptop, scrtop,
3334      * selection, rv,
3335      * cfg.blinkpc, blink_is_real, tblinker,
3336      * curs.y, curs.x, blinker, cfg.blink_cur, cursor_on, has_focus, wrapnext
3337      */
3338
3339     /* Has the cursor position or type changed ? */
3340     if (term->cursor_on) {
3341         if (term->has_focus) {
3342             if (term->blinker || !term->cfg.blink_cur)
3343                 cursor = TATTR_ACTCURS;
3344             else
3345                 cursor = 0;
3346         } else
3347             cursor = TATTR_PASCURS;
3348         if (term->wrapnext)
3349             cursor |= TATTR_RIGHTCURS;
3350     } else
3351         cursor = 0;
3352     our_curs_y = term->curs.y - term->disptop;
3353     {
3354         /*
3355          * Adjust the cursor position in the case where it's
3356          * resting on the right-hand half of a CJK wide character.
3357          * xterm's behaviour here, which seems adequate to me, is
3358          * to display the cursor covering the _whole_ character,
3359          * exactly as if it were one space to the left.
3360          */
3361         unsigned long *ldata = lineptr(term->curs.y);
3362         our_curs_x = term->curs.x;
3363         if (our_curs_x > 0 &&
3364             (ldata[our_curs_x] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
3365             our_curs_x--;
3366     }
3367
3368     if (term->dispcurs && (term->curstype != cursor ||
3369                            term->dispcurs !=
3370                            term->disptext + our_curs_y * (term->cols + 1) +
3371                            our_curs_x)) {
3372         if (term->dispcurs > term->disptext &&
3373             (*term->dispcurs & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
3374             term->dispcurs[-1] |= ATTR_INVALID;
3375         if ( (term->dispcurs[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
3376             term->dispcurs[1] |= ATTR_INVALID;
3377         *term->dispcurs |= ATTR_INVALID;
3378         term->curstype = 0;
3379     }
3380     term->dispcurs = NULL;
3381
3382 #ifdef OPTIMISE_SCROLL
3383     /* Do scrolls */
3384     sr = term->scrollhead;
3385     while (sr) {
3386         struct scrollregion *next = sr->next;
3387         do_scroll(ctx, sr->topline, sr->botline, sr->lines);
3388         sfree(sr);
3389         sr = next;
3390     }
3391     term->scrollhead = term->scrolltail = NULL;
3392 #endif /* OPTIMISE_SCROLL */
3393
3394     /* The normal screen data */
3395     for (i = 0; i < term->rows; i++) {
3396         unsigned long *ldata;
3397         int lattr;
3398         int idx, dirty_line, dirty_run, selected;
3399         unsigned long attr = 0;
3400         int updated_line = 0;
3401         int start = 0;
3402         int ccount = 0;
3403         int last_run_dirty = 0;
3404
3405         scrpos.y = i + term->disptop;
3406         ldata = lineptr(scrpos.y);
3407         lattr = (ldata[term->cols] & LATTR_MODE);
3408
3409         idx = i * (term->cols + 1);
3410         dirty_run = dirty_line = (ldata[term->cols] !=
3411                                   term->disptext[idx + term->cols]);
3412         term->disptext[idx + term->cols] = ldata[term->cols];
3413
3414         for (j = 0; j < term->cols; j++, idx++) {
3415             unsigned long tattr, tchar;
3416             unsigned long *d = ldata + j;
3417             int break_run;
3418             scrpos.x = j;
3419
3420             tchar = (*d & (CHAR_MASK | CSET_MASK));
3421             tattr = (*d & (ATTR_MASK ^ CSET_MASK));
3422             switch (tchar & CSET_MASK) {
3423               case ATTR_ASCII:
3424                 tchar = term->ucsdata->unitab_line[tchar & 0xFF];
3425                 break;
3426               case ATTR_LINEDRW:
3427                 tchar = term->ucsdata->unitab_xterm[tchar & 0xFF];
3428                 break;
3429               case ATTR_SCOACS:
3430                 tchar = term->ucsdata->unitab_scoacs[tchar&0xFF];
3431                 break;
3432             }
3433             tattr |= (tchar & CSET_MASK);
3434             tchar &= CHAR_MASK;
3435             if (j < term->cols-1 &&
3436                 (d[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
3437                 tattr |= ATTR_WIDE;
3438
3439             /* Video reversing things */
3440             if (term->selstate == DRAGGING || term->selstate == SELECTED) {
3441                 if (term->seltype == LEXICOGRAPHIC)
3442                     selected = (posle(term->selstart, scrpos) &&
3443                                 poslt(scrpos, term->selend));
3444                 else
3445                     selected = (posPle(term->selstart, scrpos) &&
3446                                 posPlt(scrpos, term->selend));
3447             } else
3448                 selected = FALSE;
3449             tattr = (tattr ^ rv
3450                      ^ (selected ? ATTR_REVERSE : 0));
3451
3452             /* 'Real' blinking ? */
3453             if (term->blink_is_real && (tattr & ATTR_BLINK)) {
3454                 if (term->has_focus && term->tblinker) {
3455                     tchar = term->ucsdata->unitab_line[(unsigned char)' '];
3456                 }
3457                 tattr &= ~ATTR_BLINK;
3458             }
3459
3460             /*
3461              * Check the font we'll _probably_ be using to see if
3462              * the character is wide when we don't want it to be.
3463              */
3464             if ((tchar | tattr) != (term->disptext[idx]& ~ATTR_NARROW)) {
3465                 if ((tattr & ATTR_WIDE) == 0 &&
3466                     char_width(ctx, (tchar | tattr) & 0xFFFF) == 2)
3467                     tattr |= ATTR_NARROW;
3468             } else if (term->disptext[idx]&ATTR_NARROW)
3469                 tattr |= ATTR_NARROW;
3470
3471             /* Cursor here ? Save the 'background' */
3472             if (i == our_curs_y && j == our_curs_x) {
3473                 cursor_background = tattr | tchar;
3474                 term->dispcurs = term->disptext + idx;
3475             }
3476
3477             if ((term->disptext[idx] ^ tattr) & ATTR_WIDE)
3478                 dirty_line = TRUE;
3479
3480             break_run = (((tattr ^ attr) & term->attr_mask) ||
3481                 j - start >= sizeof(ch));
3482
3483             /* Special hack for VT100 Linedraw glyphs */
3484             if ((attr & CSET_MASK) == 0x2300 && tchar >= 0xBA
3485                 && tchar <= 0xBD) break_run = TRUE;
3486
3487             if (!term->ucsdata->dbcs_screenfont && !dirty_line) {
3488                 if ((tchar | tattr) == term->disptext[idx])
3489                     break_run = TRUE;
3490                 else if (!dirty_run && ccount == 1)
3491                     break_run = TRUE;
3492             }
3493
3494             if (break_run) {
3495                 if ((dirty_run || last_run_dirty) && ccount > 0) {
3496                     do_text(ctx, start, i, ch, ccount, attr, lattr);
3497                     updated_line = 1;
3498                 }
3499                 start = j;
3500                 ccount = 0;
3501                 attr = tattr;
3502                 if (term->ucsdata->dbcs_screenfont)
3503                     last_run_dirty = dirty_run;
3504                 dirty_run = dirty_line;
3505             }
3506
3507             if ((tchar | tattr) != term->disptext[idx])
3508                 dirty_run = TRUE;
3509             ch[ccount++] = (char) tchar;
3510             term->disptext[idx] = tchar | tattr;
3511
3512             /* If it's a wide char step along to the next one. */
3513             if (tattr & ATTR_WIDE) {
3514                 if (++j < term->cols) {
3515                     idx++;
3516                     d++;
3517                     /*
3518                      * By construction above, the cursor should not
3519                      * be on the right-hand half of this character.
3520                      * Ever.
3521                      */
3522                     assert(!(i == our_curs_y && j == our_curs_x));
3523                     if (term->disptext[idx] != *d)
3524                         dirty_run = TRUE;
3525                     term->disptext[idx] = *d;
3526                 }
3527             }
3528         }
3529         if (dirty_run && ccount > 0) {
3530             do_text(ctx, start, i, ch, ccount, attr, lattr);
3531             updated_line = 1;
3532         }
3533
3534         /* Cursor on this line ? (and changed) */
3535         if (i == our_curs_y && (term->curstype != cursor || updated_line)) {
3536             ch[0] = (char) (cursor_background & CHAR_MASK);
3537             attr = (cursor_background & ATTR_MASK) | cursor;
3538             do_cursor(ctx, our_curs_x, i, ch, 1, attr, lattr);
3539             term->curstype = cursor;
3540         }
3541     }
3542 }
3543
3544 /*
3545  * Flick the switch that says if blinking things should be shown or hidden.
3546  */
3547
3548 void term_blink(Terminal *term, int flg)
3549 {
3550     long now, blink_diff;
3551
3552     now = GETTICKCOUNT();
3553     blink_diff = now - term->last_tblink;
3554
3555     /* Make sure the text blinks no more than 2Hz; we'll use 0.45 s period. */
3556     if (blink_diff < 0 || blink_diff > (TICKSPERSEC * 9 / 20)) {
3557         term->last_tblink = now;
3558         term->tblinker = !term->tblinker;
3559     }
3560
3561     if (flg) {
3562         term->blinker = 1;
3563         term->last_blink = now;
3564         return;
3565     }
3566
3567     blink_diff = now - term->last_blink;
3568
3569     /* Make sure the cursor blinks no faster than system blink rate */
3570     if (blink_diff >= 0 && blink_diff < (long) CURSORBLINK)
3571         return;
3572
3573     term->last_blink = now;
3574     term->blinker = !term->blinker;
3575 }
3576
3577 /*
3578  * Invalidate the whole screen so it will be repainted in full.
3579  */
3580 void term_invalidate(Terminal *term)
3581 {
3582     int i;
3583
3584     for (i = 0; i < term->rows * (term->cols + 1); i++)
3585         term->disptext[i] = ATTR_INVALID;
3586 }
3587
3588 /*
3589  * Paint the window in response to a WM_PAINT message.
3590  */
3591 void term_paint(Terminal *term, Context ctx,
3592                 int left, int top, int right, int bottom, int immediately)
3593 {
3594     int i, j;
3595     if (left < 0) left = 0;
3596     if (top < 0) top = 0;
3597     if (right >= term->cols) right = term->cols-1;
3598     if (bottom >= term->rows) bottom = term->rows-1;
3599
3600     for (i = top; i <= bottom && i < term->rows; i++) {
3601         if ((term->disptext[i * (term->cols + 1) + term->cols] &
3602              LATTR_MODE) == LATTR_NORM)
3603             for (j = left; j <= right && j < term->cols; j++)
3604                 term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
3605         else
3606             for (j = left / 2; j <= right / 2 + 1 && j < term->cols; j++)
3607                 term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
3608     }
3609
3610     /* This should happen soon enough, also for some reason it sometimes
3611      * fails to actually do anything when re-sizing ... painting the wrong
3612      * window perhaps ?
3613      */
3614     if (immediately)
3615         do_paint (term, ctx, FALSE);
3616 }
3617
3618 /*
3619  * Attempt to scroll the scrollback. The second parameter gives the
3620  * position we want to scroll to; the first is +1 to denote that
3621  * this position is relative to the beginning of the scrollback, -1
3622  * to denote it is relative to the end, and 0 to denote that it is
3623  * relative to the current position.
3624  */
3625 void term_scroll(Terminal *term, int rel, int where)
3626 {
3627     int sbtop = -sblines(term);
3628 #ifdef OPTIMISE_SCROLL
3629     int olddisptop = term->disptop;
3630     int shift;
3631 #endif /* OPTIMISE_SCROLL */
3632
3633     term->disptop = (rel < 0 ? 0 : rel > 0 ? sbtop : term->disptop) + where;
3634     if (term->disptop < sbtop)
3635         term->disptop = sbtop;
3636     if (term->disptop > 0)
3637         term->disptop = 0;
3638     update_sbar(term);
3639 #ifdef OPTIMISE_SCROLL
3640     shift = (term->disptop - olddisptop);
3641     if (shift < term->rows && shift > -term->rows)
3642         scroll_display(term, 0, term->rows - 1, shift);
3643 #endif /* OPTIMISE_SCROLL */
3644     term_update(term);
3645 }
3646
3647 static void clipme(Terminal *term, pos top, pos bottom, int rect, int desel)
3648 {
3649     wchar_t *workbuf;
3650     wchar_t *wbptr;                    /* where next char goes within workbuf */
3651     int old_top_x;
3652     int wblen = 0;                     /* workbuf len */
3653     int buflen;                        /* amount of memory allocated to workbuf */
3654
3655     buflen = 5120;                     /* Default size */
3656     workbuf = snewn(buflen, wchar_t);
3657     wbptr = workbuf;                   /* start filling here */
3658     old_top_x = top.x;                 /* needed for rect==1 */
3659
3660     while (poslt(top, bottom)) {
3661         int nl = FALSE;
3662         unsigned long *ldata = lineptr(top.y);
3663         pos nlpos;
3664
3665         /*
3666          * nlpos will point at the maximum position on this line we
3667          * should copy up to. So we start it at the end of the
3668          * line...
3669          */
3670         nlpos.y = top.y;
3671         nlpos.x = term->cols;
3672
3673         /*
3674          * ... move it backwards if there's unused space at the end
3675          * of the line (and also set `nl' if this is the case,
3676          * because in normal selection mode this means we need a
3677          * newline at the end)...
3678          */
3679         if (!(ldata[term->cols] & LATTR_WRAPPED)) {
3680             while (((ldata[nlpos.x - 1] & 0xFF) == 0x20 ||
3681                     (DIRECT_CHAR(ldata[nlpos.x - 1]) &&
3682                      (ldata[nlpos.x - 1] & CHAR_MASK) == 0x20))
3683                    && poslt(top, nlpos))
3684                 decpos(nlpos);
3685             if (poslt(nlpos, bottom))
3686                 nl = TRUE;
3687         } else if (ldata[term->cols] & LATTR_WRAPPED2) {
3688             /* Ignore the last char on the line in a WRAPPED2 line. */
3689             decpos(nlpos);
3690         }
3691
3692         /*
3693          * ... and then clip it to the terminal x coordinate if
3694          * we're doing rectangular selection. (In this case we
3695          * still did the above, so that copying e.g. the right-hand
3696          * column from a table doesn't fill with spaces on the
3697          * right.)
3698          */
3699         if (rect) {
3700             if (nlpos.x > bottom.x)
3701                 nlpos.x = bottom.x;
3702             nl = (top.y < bottom.y);
3703         }
3704
3705         while (poslt(top, bottom) && poslt(top, nlpos)) {
3706 #if 0
3707             char cbuf[16], *p;
3708             sprintf(cbuf, "<U+%04x>", (ldata[top.x] & 0xFFFF));
3709 #else
3710             wchar_t cbuf[16], *p;
3711             int uc = (ldata[top.x] & 0xFFFF);
3712             int set, c;
3713
3714             if (uc == UCSWIDE) {
3715                 top.x++;
3716                 continue;
3717             }
3718
3719             switch (uc & CSET_MASK) {
3720               case ATTR_LINEDRW:
3721                 if (!term->cfg.rawcnp) {
3722                     uc = term->ucsdata->unitab_xterm[uc & 0xFF];
3723                     break;
3724                 }
3725               case ATTR_ASCII:
3726                 uc = term->ucsdata->unitab_line[uc & 0xFF];
3727                 break;
3728               case ATTR_SCOACS:
3729                 uc = term->ucsdata->unitab_scoacs[uc&0xFF];
3730                 break;
3731             }
3732             switch (uc & CSET_MASK) {
3733               case ATTR_ACP:
3734                 uc = term->ucsdata->unitab_font[uc & 0xFF];
3735                 break;
3736               case ATTR_OEMCP:
3737                 uc = term->ucsdata->unitab_oemcp[uc & 0xFF];
3738                 break;
3739             }
3740
3741             set = (uc & CSET_MASK);
3742             c = (uc & CHAR_MASK);
3743             cbuf[0] = uc;
3744             cbuf[1] = 0;
3745
3746             if (DIRECT_FONT(uc)) {
3747                 if (c >= ' ' && c != 0x7F) {
3748                     char buf[4];
3749                     WCHAR wbuf[4];
3750                     int rv;
3751                     if (is_dbcs_leadbyte(term->ucsdata->font_codepage, (BYTE) c)) {
3752                         buf[0] = c;
3753                         buf[1] = (char) (0xFF & ldata[top.x + 1]);
3754                         rv = mb_to_wc(term->ucsdata->font_codepage, 0, buf, 2, wbuf, 4);
3755                         top.x++;
3756                     } else {
3757                         buf[0] = c;
3758                         rv = mb_to_wc(term->ucsdata->font_codepage, 0, buf, 1, wbuf, 4);
3759                     }
3760
3761                     if (rv > 0) {
3762                         memcpy(cbuf, wbuf, rv * sizeof(wchar_t));
3763                         cbuf[rv] = 0;
3764                     }
3765                 }
3766             }
3767 #endif
3768
3769             for (p = cbuf; *p; p++) {
3770                 /* Enough overhead for trailing NL and nul */
3771                 if (wblen >= buflen - 16) {
3772                     buflen += 100;
3773                     workbuf = sresize(workbuf, buflen, wchar_t);
3774                     wbptr = workbuf + wblen;
3775                 }
3776                 wblen++;
3777                 *wbptr++ = *p;
3778             }
3779             top.x++;
3780         }
3781         if (nl) {
3782             int i;
3783             for (i = 0; i < sel_nl_sz; i++) {
3784                 wblen++;
3785                 *wbptr++ = sel_nl[i];
3786             }
3787         }
3788         top.y++;
3789         top.x = rect ? old_top_x : 0;
3790     }
3791 #if SELECTION_NUL_TERMINATED
3792     wblen++;
3793     *wbptr++ = 0;
3794 #endif
3795     write_clip(term->frontend, workbuf, wblen, desel); /* transfer to clipbd */
3796     if (buflen > 0)                    /* indicates we allocated this buffer */
3797         sfree(workbuf);
3798 }
3799
3800 void term_copyall(Terminal *term)
3801 {
3802     pos top;
3803     pos bottom;
3804     tree234 *screen = term->screen;
3805     top.y = -sblines(term);
3806     top.x = 0;
3807     bottom.y = find_last_nonempty_line(term, screen);
3808     bottom.x = term->cols;
3809     clipme(term, top, bottom, 0, TRUE);
3810 }
3811
3812 /*
3813  * The wordness array is mainly for deciding the disposition of the
3814  * US-ASCII characters.
3815  */
3816 static int wordtype(Terminal *term, int uc)
3817 {
3818     struct ucsword {
3819         int start, end, ctype;
3820     };
3821     static const struct ucsword ucs_words[] = {
3822         {
3823         128, 160, 0}, {
3824         161, 191, 1}, {
3825         215, 215, 1}, {
3826         247, 247, 1}, {
3827         0x037e, 0x037e, 1},            /* Greek question mark */
3828         {
3829         0x0387, 0x0387, 1},            /* Greek ano teleia */
3830         {
3831         0x055a, 0x055f, 1},            /* Armenian punctuation */
3832         {
3833         0x0589, 0x0589, 1},            /* Armenian full stop */
3834         {
3835         0x0700, 0x070d, 1},            /* Syriac punctuation */
3836         {
3837         0x104a, 0x104f, 1},            /* Myanmar punctuation */
3838         {
3839         0x10fb, 0x10fb, 1},            /* Georgian punctuation */
3840         {
3841         0x1361, 0x1368, 1},            /* Ethiopic punctuation */
3842         {
3843         0x166d, 0x166e, 1},            /* Canadian Syl. punctuation */
3844         {
3845         0x17d4, 0x17dc, 1},            /* Khmer punctuation */
3846         {
3847         0x1800, 0x180a, 1},            /* Mongolian punctuation */
3848         {
3849         0x2000, 0x200a, 0},            /* Various spaces */
3850         {
3851         0x2070, 0x207f, 2},            /* superscript */
3852         {
3853         0x2080, 0x208f, 2},            /* subscript */
3854         {
3855         0x200b, 0x27ff, 1},            /* punctuation and symbols */
3856         {
3857         0x3000, 0x3000, 0},            /* ideographic space */
3858         {
3859         0x3001, 0x3020, 1},            /* ideographic punctuation */
3860         {
3861         0x303f, 0x309f, 3},            /* Hiragana */
3862         {
3863         0x30a0, 0x30ff, 3},            /* Katakana */
3864         {
3865         0x3300, 0x9fff, 3},            /* CJK Ideographs */
3866         {
3867         0xac00, 0xd7a3, 3},            /* Hangul Syllables */
3868         {
3869         0xf900, 0xfaff, 3},            /* CJK Ideographs */
3870         {
3871         0xfe30, 0xfe6b, 1},            /* punctuation forms */
3872         {
3873         0xff00, 0xff0f, 1},            /* half/fullwidth ASCII */
3874         {
3875         0xff1a, 0xff20, 1},            /* half/fullwidth ASCII */
3876         {
3877         0xff3b, 0xff40, 1},            /* half/fullwidth ASCII */
3878         {
3879         0xff5b, 0xff64, 1},            /* half/fullwidth ASCII */
3880         {
3881         0xfff0, 0xffff, 0},            /* half/fullwidth ASCII */
3882         {
3883         0, 0, 0}
3884     };
3885     const struct ucsword *wptr;
3886
3887     uc &= (CSET_MASK | CHAR_MASK);
3888
3889     switch (uc & CSET_MASK) {
3890       case ATTR_LINEDRW:
3891         uc = term->ucsdata->unitab_xterm[uc & 0xFF];
3892         break;
3893       case ATTR_ASCII:
3894         uc = term->ucsdata->unitab_line[uc & 0xFF];
3895         break;
3896       case ATTR_SCOACS:
3897         uc = term->ucsdata->unitab_scoacs[uc&0xFF];
3898         break;
3899     }
3900     switch (uc & CSET_MASK) {
3901       case ATTR_ACP:
3902         uc = term->ucsdata->unitab_font[uc & 0xFF];
3903         break;
3904       case ATTR_OEMCP:
3905         uc = term->ucsdata->unitab_oemcp[uc & 0xFF];
3906         break;
3907     }
3908
3909     /* For DBCS font's I can't do anything usefull. Even this will sometimes
3910      * fail as there's such a thing as a double width space. :-(
3911      */
3912     if (term->ucsdata->dbcs_screenfont &&
3913         term->ucsdata->font_codepage == term->ucsdata->line_codepage)
3914         return (uc != ' ');
3915
3916     if (uc < 0x80)
3917         return term->wordness[uc];
3918
3919     for (wptr = ucs_words; wptr->start; wptr++) {
3920         if (uc >= wptr->start && uc <= wptr->end)
3921             return wptr->ctype;
3922     }
3923
3924     return 2;
3925 }
3926
3927 /*
3928  * Spread the selection outwards according to the selection mode.
3929  */
3930 static pos sel_spread_half(Terminal *term, pos p, int dir)
3931 {
3932     unsigned long *ldata;
3933     short wvalue;
3934     int topy = -sblines(term);
3935
3936     ldata = lineptr(p.y);
3937
3938     switch (term->selmode) {
3939       case SM_CHAR:
3940         /*
3941          * In this mode, every character is a separate unit, except
3942          * for runs of spaces at the end of a non-wrapping line.
3943          */
3944         if (!(ldata[term->cols] & LATTR_WRAPPED)) {
3945             unsigned long *q = ldata + term->cols;
3946             while (q > ldata && (q[-1] & CHAR_MASK) == 0x20)
3947                 q--;
3948             if (q == ldata + term->cols)
3949                 q--;
3950             if (p.x >= q - ldata)
3951                 p.x = (dir == -1 ? q - ldata : term->cols - 1);
3952         }
3953         break;
3954       case SM_WORD:
3955         /*
3956          * In this mode, the units are maximal runs of characters
3957          * whose `wordness' has the same value.
3958          */
3959         wvalue = wordtype(term, UCSGET(ldata, p.x));
3960         if (dir == +1) {
3961             while (1) {
3962                 int maxcols = (ldata[term->cols] & LATTR_WRAPPED2 ?
3963                                term->cols-1 : term->cols);
3964                 if (p.x < maxcols-1) {
3965                     if (wordtype(term, UCSGET(ldata, p.x + 1)) == wvalue)
3966                         p.x++;
3967                     else
3968                         break;
3969                 } else {
3970                     if (ldata[term->cols] & LATTR_WRAPPED) {
3971                         unsigned long *ldata2;
3972                         ldata2 = lineptr(p.y+1);
3973                         if (wordtype(term, UCSGET(ldata2, 0)) == wvalue) {
3974                             p.x = 0;
3975                             p.y++;
3976                             ldata = ldata2;
3977                         } else
3978                             break;
3979                     } else
3980                         break;
3981                 }
3982             }
3983         } else {
3984             while (1) {
3985                 if (p.x > 0) {
3986                     if (wordtype(term, UCSGET(ldata, p.x - 1)) == wvalue)
3987                         p.x--;
3988                     else
3989                         break;
3990                 } else {
3991                     unsigned long *ldata2;
3992                     int maxcols;
3993                     if (p.y <= topy)
3994                         break;
3995                     ldata2 = lineptr(p.y-1);
3996                     maxcols = (ldata2[term->cols] & LATTR_WRAPPED2 ?
3997                               term->cols-1 : term->cols);
3998                     if (ldata2[term->cols] & LATTR_WRAPPED) {
3999                         if (wordtype(term, UCSGET(ldata2, maxcols-1))
4000                             == wvalue) {
4001                             p.x = maxcols-1;
4002                             p.y--;
4003                             ldata = ldata2;
4004                         } else
4005                             break;
4006                     } else
4007                         break;
4008                 }
4009             }
4010         }
4011         break;
4012       case SM_LINE:
4013         /*
4014          * In this mode, every line is a unit.
4015          */
4016         p.x = (dir == -1 ? 0 : term->cols - 1);
4017         break;
4018     }
4019     return p;
4020 }
4021
4022 static void sel_spread(Terminal *term)
4023 {
4024     if (term->seltype == LEXICOGRAPHIC) {
4025         term->selstart = sel_spread_half(term, term->selstart, -1);
4026         decpos(term->selend);
4027         term->selend = sel_spread_half(term, term->selend, +1);
4028         incpos(term->selend);
4029     }
4030 }
4031
4032 void term_do_paste(Terminal *term)
4033 {
4034     wchar_t *data;
4035     int len;
4036
4037     get_clip(term->frontend, &data, &len);
4038     if (data && len > 0) {
4039         wchar_t *p, *q;
4040
4041         term_seen_key_event(term);     /* pasted data counts */
4042
4043         if (term->paste_buffer)
4044             sfree(term->paste_buffer);
4045         term->paste_pos = term->paste_hold = term->paste_len = 0;
4046         term->paste_buffer = snewn(len, wchar_t);
4047
4048         p = q = data;
4049         while (p < data + len) {
4050             while (p < data + len &&
4051                    !(p <= data + len - sel_nl_sz &&
4052                      !memcmp(p, sel_nl, sizeof(sel_nl))))
4053                 p++;
4054
4055             {
4056                 int i;
4057                 for (i = 0; i < p - q; i++) {
4058                     term->paste_buffer[term->paste_len++] = q[i];
4059                 }
4060             }
4061
4062             if (p <= data + len - sel_nl_sz &&
4063                 !memcmp(p, sel_nl, sizeof(sel_nl))) {
4064                 term->paste_buffer[term->paste_len++] = '\015';
4065                 p += sel_nl_sz;
4066             }
4067             q = p;
4068         }
4069
4070         /* Assume a small paste will be OK in one go. */
4071         if (term->paste_len < 256) {
4072             if (term->ldisc)
4073                 luni_send(term->ldisc, term->paste_buffer, term->paste_len, 0);
4074             if (term->paste_buffer)
4075                 sfree(term->paste_buffer);
4076             term->paste_buffer = 0;
4077             term->paste_pos = term->paste_hold = term->paste_len = 0;
4078         }
4079     }
4080     get_clip(term->frontend, NULL, NULL);
4081 }
4082
4083 void term_mouse(Terminal *term, Mouse_Button braw, Mouse_Button bcooked,
4084                 Mouse_Action a, int x, int y, int shift, int ctrl, int alt)
4085 {
4086     pos selpoint;
4087     unsigned long *ldata;
4088     int raw_mouse = (term->xterm_mouse &&
4089                      !term->cfg.no_mouse_rep &&
4090                      !(term->cfg.mouse_override && shift));
4091     int default_seltype;
4092
4093     if (y < 0) {
4094         y = 0;
4095         if (a == MA_DRAG && !raw_mouse)
4096             term_scroll(term, 0, -1);
4097     }
4098     if (y >= term->rows) {
4099         y = term->rows - 1;
4100         if (a == MA_DRAG && !raw_mouse)
4101             term_scroll(term, 0, +1);
4102     }
4103     if (x < 0) {
4104         if (y > 0) {
4105             x = term->cols - 1;
4106             y--;
4107         } else
4108             x = 0;
4109     }
4110     if (x >= term->cols)
4111         x = term->cols - 1;
4112
4113     selpoint.y = y + term->disptop;
4114     selpoint.x = x;
4115     ldata = lineptr(selpoint.y);
4116     if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM)
4117         selpoint.x /= 2;
4118
4119     if (raw_mouse) {
4120         int encstate = 0, r, c;
4121         char abuf[16];
4122
4123         if (term->ldisc) {
4124
4125             switch (braw) {
4126               case MBT_LEFT:
4127                 encstate = 0x20;               /* left button down */
4128                 break;
4129               case MBT_MIDDLE:
4130                 encstate = 0x21;
4131                 break;
4132               case MBT_RIGHT:
4133                 encstate = 0x22;
4134                 break;
4135               case MBT_WHEEL_UP:
4136                 encstate = 0x60;
4137                 break;
4138               case MBT_WHEEL_DOWN:
4139                 encstate = 0x61;
4140                 break;
4141               default: break;          /* placate gcc warning about enum use */
4142             }
4143             switch (a) {
4144               case MA_DRAG:
4145                 if (term->xterm_mouse == 1)
4146                     return;
4147                 encstate += 0x20;
4148                 break;
4149               case MA_RELEASE:
4150                 encstate = 0x23;
4151                 term->mouse_is_down = 0;
4152                 break;
4153               case MA_CLICK:
4154                 if (term->mouse_is_down == braw)
4155                     return;
4156                 term->mouse_is_down = braw;
4157                 break;
4158               default: break;          /* placate gcc warning about enum use */
4159             }
4160             if (shift)
4161                 encstate += 0x04;
4162             if (ctrl)
4163                 encstate += 0x10;
4164             r = y + 33;
4165             c = x + 33;
4166
4167             sprintf(abuf, "\033[M%c%c%c", encstate, c, r);
4168             ldisc_send(term->ldisc, abuf, 6, 0);
4169         }
4170         return;
4171     }
4172
4173     /*
4174      * Set the selection type (rectangular or normal) at the start
4175      * of a selection attempt, from the state of Alt.
4176      */
4177     if (!alt ^ !term->cfg.rect_select)
4178         default_seltype = RECTANGULAR;
4179     else
4180         default_seltype = LEXICOGRAPHIC;
4181
4182     if (term->selstate == NO_SELECTION) {
4183         term->seltype = default_seltype;
4184     }
4185
4186     if (bcooked == MBT_SELECT && a == MA_CLICK) {
4187         deselect(term);
4188         term->selstate = ABOUT_TO;
4189         term->seltype = default_seltype;
4190         term->selanchor = selpoint;
4191         term->selmode = SM_CHAR;
4192     } else if (bcooked == MBT_SELECT && (a == MA_2CLK || a == MA_3CLK)) {
4193         deselect(term);
4194         term->selmode = (a == MA_2CLK ? SM_WORD : SM_LINE);
4195         term->selstate = DRAGGING;
4196         term->selstart = term->selanchor = selpoint;
4197         term->selend = term->selstart;
4198         incpos(term->selend);
4199         sel_spread(term);
4200     } else if ((bcooked == MBT_SELECT && a == MA_DRAG) ||
4201                (bcooked == MBT_EXTEND && a != MA_RELEASE)) {
4202         if (term->selstate == ABOUT_TO && poseq(term->selanchor, selpoint))
4203             return;
4204         if (bcooked == MBT_EXTEND && a != MA_DRAG &&
4205             term->selstate == SELECTED) {
4206             if (term->seltype == LEXICOGRAPHIC) {
4207                 /*
4208                  * For normal selection, we extend by moving
4209                  * whichever end of the current selection is closer
4210                  * to the mouse.
4211                  */
4212                 if (posdiff(selpoint, term->selstart) <
4213                     posdiff(term->selend, term->selstart) / 2) {
4214                     term->selanchor = term->selend;
4215                     decpos(term->selanchor);
4216                 } else {
4217                     term->selanchor = term->selstart;
4218                 }
4219             } else {
4220                 /*
4221                  * For rectangular selection, we have a choice of
4222                  * _four_ places to put selanchor and selpoint: the
4223                  * four corners of the selection.
4224                  */
4225                 if (2*selpoint.x < term->selstart.x + term->selend.x)
4226                     term->selanchor.x = term->selend.x-1;
4227                 else
4228                     term->selanchor.x = term->selstart.x;
4229
4230                 if (2*selpoint.y < term->selstart.y + term->selend.y)
4231                     term->selanchor.y = term->selend.y;
4232                 else
4233                     term->selanchor.y = term->selstart.y;
4234             }
4235             term->selstate = DRAGGING;
4236         }
4237         if (term->selstate != ABOUT_TO && term->selstate != DRAGGING)
4238             term->selanchor = selpoint;
4239         term->selstate = DRAGGING;
4240         if (term->seltype == LEXICOGRAPHIC) {
4241             /*
4242              * For normal selection, we set (selstart,selend) to
4243              * (selpoint,selanchor) in some order.
4244              */
4245             if (poslt(selpoint, term->selanchor)) {
4246                 term->selstart = selpoint;
4247                 term->selend = term->selanchor;
4248                 incpos(term->selend);
4249             } else {
4250                 term->selstart = term->selanchor;
4251                 term->selend = selpoint;
4252                 incpos(term->selend);
4253             }
4254         } else {
4255             /*
4256              * For rectangular selection, we may need to
4257              * interchange x and y coordinates (if the user has
4258              * dragged in the -x and +y directions, or vice versa).
4259              */
4260             term->selstart.x = min(term->selanchor.x, selpoint.x);
4261             term->selend.x = 1+max(term->selanchor.x, selpoint.x);
4262             term->selstart.y = min(term->selanchor.y, selpoint.y);
4263             term->selend.y =   max(term->selanchor.y, selpoint.y);
4264         }
4265         sel_spread(term);
4266     } else if ((bcooked == MBT_SELECT || bcooked == MBT_EXTEND) &&
4267                a == MA_RELEASE) {
4268         if (term->selstate == DRAGGING) {
4269             /*
4270              * We've completed a selection. We now transfer the
4271              * data to the clipboard.
4272              */
4273             clipme(term, term->selstart, term->selend,
4274                    (term->seltype == RECTANGULAR), FALSE);
4275             term->selstate = SELECTED;
4276         } else
4277             term->selstate = NO_SELECTION;
4278     } else if (bcooked == MBT_PASTE
4279                && (a == MA_CLICK
4280 #if MULTICLICK_ONLY_EVENT
4281                    || a == MA_2CLK || a == MA_3CLK
4282 #endif
4283                    )) {
4284         request_paste(term->frontend);
4285     }
4286
4287     term_update(term);
4288 }
4289
4290 void term_key(Terminal *term, Key_Sym keysym, wchar_t *text, size_t tlen,
4291               unsigned int modifiers, unsigned int flags)
4292 {
4293     char output[10];
4294     char *p = output;
4295     int prependesc = FALSE;
4296 #if 0
4297     int i;
4298
4299     fprintf(stderr, "keysym = %d, %d chars:", keysym, tlen);
4300     for (i = 0; i < tlen; i++)
4301         fprintf(stderr, " %04x", (unsigned)text[i]);
4302     fprintf(stderr, "\n");
4303 #endif
4304
4305     /* XXX Num Lock */
4306     if ((flags & PKF_REPEAT) && term->repeat_off)
4307         return;
4308
4309     /* Currently, Meta always just prefixes everything with ESC. */
4310     if (modifiers & PKM_META)
4311         prependesc = TRUE;
4312     modifiers &= ~PKM_META;
4313
4314     /*
4315      * Alt is only used for Alt+keypad, which isn't supported yet, so
4316      * ignore it.
4317      */
4318     modifiers &= ~PKM_ALT;
4319
4320     /* Standard local function keys */
4321     switch (modifiers & (PKM_SHIFT | PKM_CONTROL)) {
4322       case PKM_SHIFT:
4323         if (keysym == PK_PAGEUP)
4324             /* scroll up one page */;
4325         if (keysym == PK_PAGEDOWN)
4326             /* scroll down on page */;
4327         if (keysym == PK_INSERT)
4328             term_do_paste(term);
4329         break;
4330       case PKM_CONTROL:
4331         if (keysym == PK_PAGEUP)
4332             /* scroll up one line */;
4333         if (keysym == PK_PAGEDOWN)
4334             /* scroll down one line */;
4335         /* Control-Numlock for app-keypad mode switch */
4336         if (keysym == PK_PF1)
4337             term->app_keypad_keys ^= 1;
4338         break;
4339     }
4340
4341     if (modifiers & PKM_ALT) {
4342         /* Alt+F4 (close) */
4343         /* Alt+Return (full screen) */
4344         /* Alt+Space (system menu) */
4345     }
4346
4347     if (keysym == PK_NULL && (modifiers & PKM_CONTROL) && tlen == 1 &&
4348         text[0] >= 0x20 && text[0] <= 0x7e) {
4349         /* ASCII chars + Control */
4350         if ((text[0] >= 0x40 && text[0] <= 0x5f) ||
4351             (text[0] >= 0x61 && text[0] <= 0x7a))
4352             text[0] &= 0x1f;
4353         else {
4354             /*
4355              * Control-2 should return ^@ (0x00), Control-6 should return
4356              * ^^ (0x1E), and Control-Minus should return ^_ (0x1F). Since
4357              * the DOS keyboard handling did it, and we have nothing better
4358              * to do with the key combo in question, we'll also map
4359              * Control-Backquote to ^\ (0x1C).
4360              */
4361             switch (text[0]) {
4362               case ' ': text[0] = 0x00; break;
4363               case '-': text[0] = 0x1f; break;
4364               case '/': text[0] = 0x1f; break;
4365               case '2': text[0] = 0x00; break;
4366               case '3': text[0] = 0x1b; break;
4367               case '4': text[0] = 0x1c; break;
4368               case '5': text[0] = 0x1d; break;
4369               case '6': text[0] = 0x1e; break;
4370               case '7': text[0] = 0x1f; break;
4371               case '8': text[0] = 0x7f; break;
4372               case '`': text[0] = 0x1c; break;
4373             }
4374         }
4375     }
4376
4377     /* Nethack keypad */
4378     if (term->cfg.nethack_keypad) {
4379         char c = 0;
4380         switch (keysym) {
4381           case PK_KP1: c = 'b'; break;
4382           case PK_KP2: c = 'j'; break;
4383           case PK_KP3: c = 'n'; break;
4384           case PK_KP4: c = 'h'; break;
4385           case PK_KP5: c = '.'; break;
4386           case PK_KP6: c = 'l'; break;
4387           case PK_KP7: c = 'y'; break;
4388           case PK_KP8: c = 'k'; break;
4389           case PK_KP9: c = 'u'; break;
4390           default: break; /* else gcc warns `enum value not used' */
4391         }
4392         if (c != 0) {
4393             if (c != '.') {
4394                 if (modifiers & PKM_CONTROL)
4395                     c &= 0x1f;
4396                 else if (modifiers & PKM_SHIFT)
4397                     c = toupper(c);
4398             }
4399             *p++ = c;
4400             goto done;
4401         }
4402     }
4403
4404     /* Numeric Keypad */
4405     if (PK_ISKEYPAD(keysym)) {
4406         int xkey = 0;
4407
4408         /*
4409          * In VT400 mode, PFn always emits an escape sequence.  In
4410          * Linux and tilde modes, this only happens in app keypad mode.
4411          */
4412         if (term->cfg.funky_type == FUNKY_VT400 ||
4413             ((term->cfg.funky_type == FUNKY_LINUX ||
4414               term->cfg.funky_type == FUNKY_TILDE) &&
4415              term->app_keypad_keys && !term->cfg.no_applic_k)) {
4416             switch (keysym) {
4417               case PK_PF1: xkey = 'P'; break;
4418               case PK_PF2: xkey = 'Q'; break;
4419               case PK_PF3: xkey = 'R'; break;
4420               case PK_PF4: xkey = 'S'; break;
4421               default: break; /* else gcc warns `enum value not used' */
4422             }
4423         }
4424         if (term->app_keypad_keys && !term->cfg.no_applic_k) {
4425             switch (keysym) {
4426               case PK_KP0: xkey = 'p'; break;
4427               case PK_KP1: xkey = 'q'; break;
4428               case PK_KP2: xkey = 'r'; break;
4429               case PK_KP3: xkey = 's'; break;
4430               case PK_KP4: xkey = 't'; break;
4431               case PK_KP5: xkey = 'u'; break;
4432               case PK_KP6: xkey = 'v'; break;
4433               case PK_KP7: xkey = 'w'; break;
4434               case PK_KP8: xkey = 'x'; break;
4435               case PK_KP9: xkey = 'y'; break;
4436               case PK_KPDECIMAL: xkey = 'n'; break;
4437               case PK_KPENTER: xkey = 'M'; break;
4438               default: break; /* else gcc warns `enum value not used' */
4439             }
4440             if (term->cfg.funky_type == FUNKY_XTERM && tlen > 0) {
4441                 /*
4442                  * xterm can't see the layout of the keypad, so it has
4443                  * to rely on the X keysyms returned by the keys.
4444                  * Hence, we look at the strings here, not the PuTTY
4445                  * keysyms (which describe the layout).
4446                  */
4447                 switch (text[0]) {
4448                   case '+':
4449                     if (modifiers & PKM_SHIFT)
4450                         xkey = 'l';
4451                     else
4452                         xkey = 'k';
4453                     break;
4454                   case '/': xkey = 'o'; break;
4455                   case '*': xkey = 'j'; break;
4456                   case '-': xkey = 'm'; break;
4457                 }
4458             } else {
4459                 /*
4460                  * In all other modes, we try to retain the layout of
4461                  * the DEC keypad in application mode.
4462                  */
4463                 switch (keysym) {
4464                   case PK_KPBIGPLUS:
4465                     /* This key covers the '-' and ',' keys on a VT220 */
4466                     if (modifiers & PKM_SHIFT)
4467                         xkey = 'm'; /* VT220 '-' */
4468                     else
4469                         xkey = 'l'; /* VT220 ',' */
4470                     break;
4471                   case PK_KPMINUS: xkey = 'm'; break;
4472                   case PK_KPCOMMA: xkey = 'l'; break;
4473                   default: break; /* else gcc warns `enum value not used' */
4474                 }
4475             }
4476         }
4477         if (xkey) {
4478             if (term->vt52_mode) {
4479                 if (xkey >= 'P' && xkey <= 'S')
4480                     p += sprintf((char *) p, "\x1B%c", xkey);
4481                 else
4482                     p += sprintf((char *) p, "\x1B?%c", xkey);
4483             } else
4484                 p += sprintf((char *) p, "\x1BO%c", xkey);
4485             goto done;
4486         }
4487         /* Not in application mode -- treat the number pad as arrow keys? */
4488         if ((flags & PKF_NUMLOCK) == 0) {
4489             switch (keysym) {
4490               case PK_KP0: keysym = PK_INSERT; break;
4491               case PK_KP1: keysym = PK_END; break;
4492               case PK_KP2: keysym = PK_DOWN; break;
4493               case PK_KP3: keysym = PK_PAGEDOWN; break;
4494               case PK_KP4: keysym = PK_LEFT; break;
4495               case PK_KP5: keysym = PK_REST; break;
4496               case PK_KP6: keysym = PK_RIGHT; break;
4497               case PK_KP7: keysym = PK_HOME; break;
4498               case PK_KP8: keysym = PK_UP; break;
4499               case PK_KP9: keysym = PK_PAGEUP; break;
4500               default: break; /* else gcc warns `enum value not used' */
4501             }
4502         }
4503     }
4504
4505     /* Miscellaneous keys */
4506     switch (keysym) {
4507       case PK_ESCAPE:
4508         *p++ = 0x1b;
4509         goto done;
4510       case PK_BACKSPACE:
4511             if (modifiers == 0)
4512                 *p++ = (term->cfg.bksp_is_delete ? 0x7F : 0x08);
4513             else if (modifiers == PKM_SHIFT)
4514                 /* We do the opposite of what is configured */
4515                 *p++ = (term->cfg.bksp_is_delete ? 0x08 : 0x7F);
4516             else break;
4517             goto done;
4518       case PK_TAB:
4519         if (modifiers == 0)
4520             *p++ = 0x09;
4521         else if (modifiers == PKM_SHIFT)
4522             *p++ = 0x1B, *p++ = '[', *p++ = 'Z';
4523         else break;
4524         goto done;
4525         /* XXX window.c has ctrl+shift+space sending 0xa0 */
4526       case PK_PAUSE:
4527         if (modifiers == PKM_CONTROL)
4528             *p++ = 26;
4529         else break;
4530         goto done;
4531       case PK_RETURN:
4532       case PK_KPENTER: /* Odd keypad modes handled above */
4533         if (modifiers == 0) {
4534             *p++ = 0x0d;
4535             if (term->cr_lf_return)
4536                 *p++ = 0x0a;
4537             goto done;
4538         }
4539       default: break; /* else gcc warns `enum value not used' */
4540     }
4541
4542     /* SCO function keys and editing keys */
4543     if (term->cfg.funky_type == FUNKY_SCO) {
4544         if (PK_ISFKEY(keysym) && keysym <= PK_F12) {
4545             static char const codes[] =
4546                 "MNOPQRSTUVWX" "YZabcdefghij" "klmnopqrstuv" "wxyz@[\\]^_`{";
4547             int index = keysym - PK_F1;
4548
4549             if (modifiers & PKM_SHIFT) index += 12;
4550             if (modifiers & PKM_CONTROL) index += 24;
4551             p += sprintf((char *) p, "\x1B[%c", codes[index]);
4552             goto done;
4553         }
4554         if (PK_ISEDITING(keysym)) {
4555             int xkey = 0;
4556
4557             switch (keysym) {
4558               case PK_DELETE:   *p++ = 0x7f; goto done;
4559               case PK_HOME:     xkey = 'H'; break;
4560               case PK_INSERT:   xkey = 'L'; break;
4561               case PK_END:      xkey = 'F'; break;
4562               case PK_PAGEUP:   xkey = 'I'; break;
4563               case PK_PAGEDOWN: xkey = 'G'; break;
4564               default: break; /* else gcc warns `enum value not used' */
4565             }
4566             p += sprintf((char *) p, "\x1B[%c", xkey);
4567         }
4568     }
4569
4570     if (PK_ISEDITING(keysym) && (modifiers & PKM_SHIFT) == 0) {
4571         int code;
4572
4573         if (term->cfg.funky_type == FUNKY_XTERM) {
4574             /* Xterm shuffles these keys, apparently. */
4575             switch (keysym) {
4576               case PK_HOME:     keysym = PK_INSERT;   break;
4577               case PK_INSERT:   keysym = PK_HOME;     break;
4578               case PK_DELETE:   keysym = PK_END;      break;
4579               case PK_END:      keysym = PK_PAGEUP;   break;
4580               case PK_PAGEUP:   keysym = PK_DELETE;   break;
4581               case PK_PAGEDOWN: keysym = PK_PAGEDOWN; break;
4582               default: break; /* else gcc warns `enum value not used' */
4583             }
4584         }
4585
4586         /* RXVT Home/End */
4587         if (term->cfg.rxvt_homeend &&
4588             (keysym == PK_HOME || keysym == PK_END)) {
4589             p += sprintf((char *) p, keysym == PK_HOME ? "\x1B[H" : "\x1BOw");
4590             goto done;
4591         }
4592
4593         if (term->vt52_mode) {
4594             int xkey;
4595
4596             /*
4597              * A real VT52 doesn't have these, and a VT220 doesn't
4598              * send anything for them in VT52 mode.
4599              */
4600             switch (keysym) {
4601               case PK_HOME:     xkey = 'H'; break;
4602               case PK_INSERT:   xkey = 'L'; break;
4603               case PK_DELETE:   xkey = 'M'; break;
4604               case PK_END:      xkey = 'E'; break;
4605               case PK_PAGEUP:   xkey = 'I'; break;
4606               case PK_PAGEDOWN: xkey = 'G'; break;
4607               default: xkey=0; break; /* else gcc warns `enum value not used'*/
4608             }
4609             p += sprintf((char *) p, "\x1B%c", xkey);
4610             goto done;
4611         }
4612
4613         switch (keysym) {
4614           case PK_HOME:     code = 1; break;
4615           case PK_INSERT:   code = 2; break;
4616           case PK_DELETE:   code = 3; break;
4617           case PK_END:      code = 4; break;
4618           case PK_PAGEUP:   code = 5; break;
4619           case PK_PAGEDOWN: code = 6; break;
4620           default: code = 0; break; /* else gcc warns `enum value not used' */
4621         }
4622         p += sprintf((char *) p, "\x1B[%d~", code);
4623         goto done;
4624     }
4625
4626     if (PK_ISFKEY(keysym)) {
4627         /* Map Shift+F1-F10 to F11-F20 */
4628         if (keysym >= PK_F1 && keysym <= PK_F10 && (modifiers & PKM_SHIFT))
4629             keysym += 10;
4630         if ((term->vt52_mode || term->cfg.funky_type == FUNKY_VT100P) &&
4631             keysym <= PK_F14) {
4632             /* XXX This overrides the XTERM/VT52 mode below */
4633             int offt = 0;
4634             if (keysym >= PK_F6)  offt++;
4635             if (keysym >= PK_F12) offt++;
4636             p += sprintf((char *) p, term->vt52_mode ? "\x1B%c" : "\x1BO%c",
4637                          'P' + keysym - PK_F1 - offt);
4638             goto done;
4639         }
4640         if (term->cfg.funky_type == FUNKY_LINUX && keysym <= PK_F5) {
4641             p += sprintf((char *) p, "\x1B[[%c", 'A' + keysym - PK_F1);
4642             goto done;
4643         }
4644         if (term->cfg.funky_type == FUNKY_XTERM && keysym <= PK_F4) {
4645             if (term->vt52_mode)
4646                 p += sprintf((char *) p, "\x1B%c", 'P' + keysym - PK_F1);
4647             else
4648                 p += sprintf((char *) p, "\x1BO%c", 'P' + keysym - PK_F1);
4649             goto done;
4650         }
4651         p += sprintf((char *) p, "\x1B[%d~", 11 + keysym - PK_F1);
4652         goto done;
4653     }
4654
4655     if (PK_ISCURSOR(keysym)) {
4656         int xkey;
4657
4658         switch (keysym) {
4659           case PK_UP:    xkey = 'A'; break;
4660           case PK_DOWN:  xkey = 'B'; break;
4661           case PK_RIGHT: xkey = 'C'; break;
4662           case PK_LEFT:  xkey = 'D'; break;
4663           case PK_REST:  xkey = 'G'; break; /* centre key on number pad */
4664           default: xkey = 0; break; /* else gcc warns `enum value not used' */
4665         }
4666         if (term->vt52_mode)
4667             p += sprintf((char *) p, "\x1B%c", xkey);
4668         else {
4669             int app_flg = (term->app_cursor_keys && !term->cfg.no_applic_c);
4670
4671             /* Useful mapping of Ctrl-arrows */
4672             if (modifiers == PKM_CONTROL)
4673                 app_flg = !app_flg;
4674
4675             if (app_flg)
4676                 p += sprintf((char *) p, "\x1BO%c", xkey);
4677             else
4678                 p += sprintf((char *) p, "\x1B[%c", xkey);
4679         }
4680         goto done;
4681     }
4682
4683   done:
4684     if (p > output || tlen > 0) {
4685         /*
4686          * Interrupt an ongoing paste. I'm not sure
4687          * this is sensible, but for the moment it's
4688          * preferable to having to faff about buffering
4689          * things.
4690          */
4691         term_nopaste(term);
4692
4693         /*
4694          * We need not bother about stdin backlogs
4695          * here, because in GUI PuTTY we can't do
4696          * anything about it anyway; there's no means
4697          * of asking Windows to hold off on KEYDOWN
4698          * messages. We _have_ to buffer everything
4699          * we're sent.
4700          */
4701         term_seen_key_event(term);
4702
4703         if (prependesc) {
4704 #if 0
4705             fprintf(stderr, "sending ESC\n");
4706 #endif
4707             ldisc_send(term->ldisc, "\x1b", 1, 1);
4708         }
4709
4710         if (p > output) {
4711 #if 0
4712             fprintf(stderr, "sending %d bytes:", p - output);
4713             for (i = 0; i < p - output; i++)
4714                 fprintf(stderr, " %02x", output[i]);
4715             fprintf(stderr, "\n");
4716 #endif
4717             ldisc_send(term->ldisc, output, p - output, 1);
4718         } else if (tlen > 0) {
4719 #if 0
4720             fprintf(stderr, "sending %d unichars:", tlen);
4721             for (i = 0; i < tlen; i++)
4722                 fprintf(stderr, " %04x", (unsigned) text[i]);
4723             fprintf(stderr, "\n");
4724 #endif
4725             luni_send(term->ldisc, text, tlen, 1);
4726         }
4727     }
4728 }
4729
4730 void term_nopaste(Terminal *term)
4731 {
4732     if (term->paste_len == 0)
4733         return;
4734     sfree(term->paste_buffer);
4735     term->paste_buffer = NULL;
4736     term->paste_len = 0;
4737 }
4738
4739 int term_paste_pending(Terminal *term)
4740 {
4741     return term->paste_len != 0;
4742 }
4743
4744 void term_paste(Terminal *term)
4745 {
4746     long now, paste_diff;
4747
4748     if (term->paste_len == 0)
4749         return;
4750
4751     /* Don't wait forever to paste */
4752     if (term->paste_hold) {
4753         now = GETTICKCOUNT();
4754         paste_diff = now - term->last_paste;
4755         if (paste_diff >= 0 && paste_diff < 450)
4756             return;
4757     }
4758     term->paste_hold = 0;
4759
4760     while (term->paste_pos < term->paste_len) {
4761         int n = 0;
4762         while (n + term->paste_pos < term->paste_len) {
4763             if (term->paste_buffer[term->paste_pos + n++] == '\015')
4764                 break;
4765         }
4766         if (term->ldisc)
4767             luni_send(term->ldisc, term->paste_buffer + term->paste_pos, n, 0);
4768         term->paste_pos += n;
4769
4770         if (term->paste_pos < term->paste_len) {
4771             term->paste_hold = 1;
4772             return;
4773         }
4774     }
4775     sfree(term->paste_buffer);
4776     term->paste_buffer = NULL;
4777     term->paste_len = 0;
4778 }
4779
4780 static void deselect(Terminal *term)
4781 {
4782     term->selstate = NO_SELECTION;
4783     term->selstart.x = term->selstart.y = term->selend.x = term->selend.y = 0;
4784 }
4785
4786 void term_deselect(Terminal *term)
4787 {
4788     deselect(term);
4789     term_update(term);
4790 }
4791
4792 int term_ldisc(Terminal *term, int option)
4793 {
4794     if (option == LD_ECHO)
4795         return term->term_echoing;
4796     if (option == LD_EDIT)
4797         return term->term_editing;
4798     return FALSE;
4799 }
4800
4801 int term_data(Terminal *term, int is_stderr, const char *data, int len)
4802 {
4803     bufchain_add(&term->inbuf, data, len);
4804
4805     if (!term->in_term_out) {
4806         term->in_term_out = TRUE;
4807         term_blink(term, 1);
4808         term_out(term);
4809         term->in_term_out = FALSE;
4810     }
4811
4812     /*
4813      * term_out() always completely empties inbuf. Therefore,
4814      * there's no reason at all to return anything other than zero
4815      * from this function, because there _can't_ be a question of
4816      * the remote side needing to wait until term_out() has cleared
4817      * a backlog.
4818      *
4819      * This is a slightly suboptimal way to deal with SSH2 - in
4820      * principle, the window mechanism would allow us to continue
4821      * to accept data on forwarded ports and X connections even
4822      * while the terminal processing was going slowly - but we
4823      * can't do the 100% right thing without moving the terminal
4824      * processing into a separate thread, and that might hurt
4825      * portability. So we manage stdout buffering the old SSH1 way:
4826      * if the terminal processing goes slowly, the whole SSH
4827      * connection stops accepting data until it's ready.
4828      *
4829      * In practice, I can't imagine this causing serious trouble.
4830      */
4831     return 0;
4832 }
4833
4834 void term_provide_logctx(Terminal *term, void *logctx)
4835 {
4836     term->logctx = logctx;
4837 }