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