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