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  * Internal prototypes.
  64  */
  65 static void do_paint(Terminal *, Context, int);
  66 static void erase_lots(Terminal *, int, int, int);
  67 static void swap_screen(Terminal *, int, int, int);
  68 static void update_sbar(Terminal *);
  69 static void deselect(Terminal *);
  70 static void term_print_finish(Terminal *);
  71
  72 /*
  73  * Resize a line to make it `cols' columns wide.
  74  */
  75 unsigned long *resizeline(unsigned long *line, int cols)
  76 {
  77     int i, oldlen;
  78     unsigned long lineattrs;
  79
  80     if (line[0] != (unsigned long)cols) {
  81         /*
  82          * This line is the wrong length, which probably means it
  83          * hasn't been accessed since a resize. Resize it now.
  84          */
  85         oldlen = line[0];
  86         lineattrs = line[oldlen + 1];
  87         line = srealloc(line, TSIZE * (2 + cols));
  88         line[0] = cols;
  89         for (i = oldlen; i < cols; i++)
  90             line[i + 1] = ERASE_CHAR;
  91         line[cols + 1] = lineattrs & LATTR_MODE;
  92     }
  93
  94     return line;
  95 }
  96
  97 /*
  98  * Retrieve a line of the screen or of the scrollback, according to
  99  * whether the y coordinate is non-negative or negative
 100  * (respectively).
 101  */
 102 unsigned long *lineptr(Terminal *term, int y, int lineno)
 103 {
 104     unsigned long *line, *newline;
 105     tree234 *whichtree;
 106     int treeindex;
 107
 108     if (y >= 0) {
 109         whichtree = term->screen;
 110         treeindex = y;
 111     } else {
 112         whichtree = term->scrollback;
 113         treeindex = y + count234(term->scrollback);
 114     }
 115     line = index234(whichtree, treeindex);
 116
 117     /* We assume that we don't screw up and retrieve something out of range. */
 118     assert(line != NULL);
 119
 120     newline = resizeline(line, term->cols);
 121     if (newline != line) {
 122         delpos234(whichtree, treeindex);
 123         addpos234(whichtree, newline, treeindex);
 124         line = newline;
 125     }
 126
 127     return line + 1;
 128 }
 129
 130 #define lineptr(x) lineptr(term,x,__LINE__)
 131
 132 /*
 133  * Set up power-on settings for the terminal.
 134  */
 135 static void power_on(Terminal *term)
 136 {
 137     term->curs.x = term->curs.y = 0;
 138     term->alt_x = term->alt_y = 0;
 139     term->savecurs.x = term->savecurs.y = 0;
 140     term->alt_t = term->marg_t = 0;
 141     if (term->rows != -1)
 142         term->alt_b = term->marg_b = term->rows - 1;
 143     else
 144         term->alt_b = term->marg_b = 0;
 145     if (term->cols != -1) {
 146         int i;
 147         for (i = 0; i < term->cols; i++)
 148             term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
 149     }
 150     term->alt_om = term->dec_om = cfg.dec_om;
 151     term->alt_ins = term->insert = FALSE;
 152     term->alt_wnext = term->wrapnext = term->save_wnext = FALSE;
 153     term->alt_wrap = term->wrap = cfg.wrap_mode;
 154     term->alt_cset = term->cset = term->save_cset = 0;
 155     term->alt_utf = term->utf = term->save_utf = 0;
 156     term->utf_state = 0;
 157     term->alt_sco_acs = term->sco_acs = term->save_sco_acs = 0;
 158     term->cset_attr[0] = term->cset_attr[1] = term->save_csattr = ATTR_ASCII;
 159     term->rvideo = 0;
 160     term->in_vbell = FALSE;
 161     term->cursor_on = 1;
 162     term->big_cursor = 0;
 163     term->save_attr = term->curr_attr = ATTR_DEFAULT;
 164     term->term_editing = term->term_echoing = FALSE;
 165     term->app_cursor_keys = cfg.app_cursor;
 166     term->app_keypad_keys = cfg.app_keypad;
 167     term->use_bce = cfg.bce;
 168     term->blink_is_real = cfg.blinktext;
 169     term->erase_char = ERASE_CHAR;
 170     term->alt_which = 0;
 171     term_print_finish(term);
 172     {
 173         int i;
 174         for (i = 0; i < 256; i++)
 175             term->wordness[i] = cfg.wordness[i];
 176     }
 177     if (term->screen) {
 178         swap_screen(term, 1, FALSE, FALSE);
 179         erase_lots(term, FALSE, TRUE, TRUE);
 180         swap_screen(term, 0, FALSE, FALSE);
 181         erase_lots(term, FALSE, TRUE, TRUE);
 182     }
 183 }
 184
 185 /*
 186  * Force a screen update.
 187  */
 188 void term_update(Terminal *term)
 189 {
 190     Context ctx;
 191     ctx = get_ctx();
 192     if (ctx) {
 193         int need_sbar_update = term->seen_disp_event;
 194         if (term->seen_disp_event && cfg.scroll_on_disp) {
 195             term->disptop = 0;         /* return to main screen */
 196             term->seen_disp_event = 0;
 197             need_sbar_update = TRUE;
 198         }
 199         if (need_sbar_update)
 200             update_sbar(term);
 201         do_paint(term, ctx, TRUE);
 202         sys_cursor(term->curs.x, term->curs.y - term->disptop);
 203         free_ctx(ctx);
 204     }
 205 }
 206
 207 /*
 208  * Called from front end when a keypress occurs, to trigger
 209  * anything magical that needs to happen in that situation.
 210  */
 211 void term_seen_key_event(Terminal *term)
 212 {
 213     /*
 214      * On any keypress, clear the bell overload mechanism
 215      * completely, on the grounds that large numbers of
 216      * beeps coming from deliberate key action are likely
 217      * to be intended (e.g. beeps from filename completion
 218      * blocking repeatedly).
 219      */
 220     term->beep_overloaded = FALSE;
 221     while (term->beephead) {
 222         struct beeptime *tmp = term->beephead;
 223         term->beephead = tmp->next;
 224         sfree(tmp);
 225     }
 226     term->beeptail = NULL;
 227     term->nbeeps = 0;
 228
 229     /*
 230      * Reset the scrollback on keypress, if we're doing that.
 231      */
 232     if (cfg.scroll_on_key) {
 233         term->disptop = 0;             /* return to main screen */
 234         term->seen_disp_event = 1;
 235     }
 236 }
 237
 238 /*
 239  * Same as power_on(), but an external function.
 240  */
 241 void term_pwron(Terminal *term)
 242 {
 243     power_on(term);
 244     ldisc_send(NULL, 0, 0);            /* cause ldisc to notice changes */
 245     fix_cpos;
 246     term->disptop = 0;
 247     deselect(term);
 248     term_update(term);
 249 }
 250
 251 /*
 252  * When the user reconfigures us, we need to check the forbidden-
 253  * alternate-screen config option, disable raw mouse mode if the
 254  * user has disabled mouse reporting, and abandon a print job if
 255  * the user has disabled printing.
 256  */
 257 void term_reconfig(Terminal *term)
 258 {
 259     if (cfg.no_alt_screen)
 260         swap_screen(term, 0, FALSE, FALSE);
 261     if (cfg.no_mouse_rep) {
 262         term->xterm_mouse = 0;
 263         set_raw_mouse_mode(0);
 264     }
 265     if (cfg.no_remote_charset) {
 266         term->cset_attr[0] = term->cset_attr[1] = ATTR_ASCII;
 267         term->sco_acs = term->alt_sco_acs = 0;
 268         term->utf = 0;
 269     }
 270     if (!*cfg.printer) {
 271         term_print_finish(term);
 272     }
 273 }
 274
 275 /*
 276  * Clear the scrollback.
 277  */
 278 void term_clrsb(Terminal *term)
 279 {
 280     unsigned long *line;
 281     term->disptop = 0;
 282     while ((line = delpos234(term->scrollback, 0)) != NULL) {
 283         sfree(line);
 284     }
 285     update_sbar(term);
 286 }
 287
 288 /*
 289  * Initialise the terminal.
 290  */
 291 Terminal *term_init(void)
 292 {
 293     Terminal *term;
 294
 295     /*
 296      * Allocate a new Terminal structure and initialise the fields
 297      * that need it.
 298      */
 299     term = smalloc(sizeof(Terminal));
 300     term->compatibility_level = TM_PUTTY;
 301     strcpy(term->id_string, "\033[?6c");
 302     term->last_blink = term->last_tblink = 0;
 303     term->paste_buffer = NULL;
 304     term->last_paste = 0;
 305     bufchain_init(&term->inbuf);
 306     bufchain_init(&term->printer_buf);
 307     term->printing = term->only_printing = FALSE;
 308     term->print_job = NULL;
 309     term->vt52_mode = FALSE;
 310     term->cr_lf_return = FALSE;
 311     term->seen_disp_event = FALSE;
 312     term->xterm_mouse = FALSE;
 313     term->reset_132 = FALSE;
 314     term->blinker = term->tblinker = 0;
 315     term->has_focus = 1;
 316     term->repeat_off = FALSE;
 317     term->termstate = TOPLEVEL;
 318     term->selstate = NO_SELECTION;
 319
 320     term->screen = term->alt_screen = term->scrollback = NULL;
 321     term->disptop = 0;
 322     term->disptext = term->dispcurs = NULL;
 323     term->tabs = NULL;
 324     deselect(term);
 325     term->rows = term->cols = -1;
 326     power_on(term);
 327     term->beephead = term->beeptail = NULL;
 328     term->nbeeps = 0;
 329     term->lastbeep = FALSE;
 330     term->beep_overloaded = FALSE;
 331     term->resize_fn = NULL;
 332     term->resize_ctx = NULL;
 333
 334     return term;
 335 }
 336
 337 /*
 338  * Set up the terminal for a given size.
 339  */
 340 void term_size(Terminal *term, int newrows, int newcols, int newsavelines)
 341 {
 342     tree234 *newalt;
 343     unsigned long *newdisp, *line;
 344     int i, j;
 345     int sblen;
 346     int save_alt_which = term->alt_which;
 347
 348     if (newrows == term->rows && newcols == term->cols &&
 349         newsavelines == term->savelines)
 350         return;                        /* nothing to do */
 351
 352     deselect(term);
 353     swap_screen(term, 0, FALSE, FALSE);
 354
 355     term->alt_t = term->marg_t = 0;
 356     term->alt_b = term->marg_b = newrows - 1;
 357
 358     if (term->rows == -1) {
 359         term->scrollback = newtree234(NULL);
 360         term->screen = newtree234(NULL);
 361         term->rows = 0;
 362     }
 363
 364     /*
 365      * Resize the screen and scrollback. We only need to shift
 366      * lines around within our data structures, because lineptr()
 367      * will take care of resizing each individual line if
 368      * necessary. So:
 369      *
 370      *  - If the new screen and the old screen differ in length, we
 371      *    must shunt some lines in from the scrollback or out to
 372      *    the scrollback.
 373      *
 374      *  - If doing that fails to provide us with enough material to
 375      *    fill the new screen (i.e. the number of rows needed in
 376      *    the new screen exceeds the total number in the previous
 377      *    screen+scrollback), we must invent some blank lines to
 378      *    cover the gap.
 379      *
 380      *  - Then, if the new scrollback length is less than the
 381      *    amount of scrollback we actually have, we must throw some
 382      *    away.
 383      */
 384     sblen = count234(term->scrollback);
 385     /* Do this loop to expand the screen if newrows > rows */
 386     for (i = term->rows; i < newrows; i++) {
 387         if (sblen > 0) {
 388             line = delpos234(term->scrollback, --sblen);
 389         } else {
 390             line = smalloc(TSIZE * (newcols + 2));
 391             line[0] = newcols;
 392             for (j = 0; j <= newcols; j++)
 393                 line[j + 1] = ERASE_CHAR;
 394         }
 395         addpos234(term->screen, line, 0);
 396     }
 397     /* Do this loop to shrink the screen if newrows < rows */
 398     for (i = newrows; i < term->rows; i++) {
 399         line = delpos234(term->screen, 0);
 400         addpos234(term->scrollback, line, sblen++);
 401     }
 402     assert(count234(term->screen) == newrows);
 403     while (sblen > newsavelines) {
 404         line = delpos234(term->scrollback, 0);
 405         sfree(line);
 406         sblen--;
 407     }
 408     assert(count234(term->scrollback) <= newsavelines);
 409     term->disptop = 0;
 410
 411     newdisp = smalloc(newrows * (newcols + 1) * TSIZE);
 412     for (i = 0; i < newrows * (newcols + 1); i++)
 413         newdisp[i] = ATTR_INVALID;
 414     sfree(term->disptext);
 415     term->disptext = newdisp;
 416     term->dispcurs = NULL;
 417
 418     newalt = newtree234(NULL);
 419     for (i = 0; i < newrows; i++) {
 420         line = smalloc(TSIZE * (newcols + 2));
 421         line[0] = newcols;
 422         for (j = 0; j <= newcols; j++)
 423             line[j + 1] = term->erase_char;
 424         addpos234(newalt, line, i);
 425     }
 426     if (term->alt_screen) {
 427         while (NULL != (line = delpos234(term->alt_screen, 0)))
 428             sfree(line);
 429         freetree234(term->alt_screen);
 430     }
 431     term->alt_screen = newalt;
 432
 433     term->tabs = srealloc(term->tabs, newcols * sizeof(*term->tabs));
 434     {
 435         int i;
 436         for (i = (term->cols > 0 ? term->cols : 0); i < newcols; i++)
 437             term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
 438     }
 439
 440     if (term->rows > 0)
 441         term->curs.y += newrows - term->rows;
 442     if (term->curs.y < 0)
 443         term->curs.y = 0;
 444     if (term->curs.y >= newrows)
 445         term->curs.y = newrows - 1;
 446     if (term->curs.x >= newcols)
 447         term->curs.x = newcols - 1;
 448     term->alt_x = term->alt_y = 0;
 449     term->wrapnext = term->alt_wnext = FALSE;
 450
 451     term->rows = newrows;
 452     term->cols = newcols;
 453     term->savelines = newsavelines;
 454     fix_cpos;
 455
 456     swap_screen(term, save_alt_which, FALSE, FALSE);
 457
 458     update_sbar(term);
 459     term_update(term);
 460     if (term->resize_fn)
 461         term->resize_fn(term->resize_ctx, term->cols, term->rows);
 462 }
 463
 464 /*
 465  * Hand a function and context pointer to the terminal which it can
 466  * use to notify a back end of resizes.
 467  */
 468 void term_provide_resize_fn(Terminal *term,
 469                             void (*resize_fn)(void *, int, int),
 470                             void *resize_ctx)
 471 {
 472     term->resize_fn = resize_fn;
 473     term->resize_ctx = resize_ctx;
 474     if (term->cols > 0 && term->rows > 0)
 475         resize_fn(resize_ctx, term->cols, term->rows);
 476 }
 477
 478 /*
 479  * Swap screens. If `reset' is TRUE and we have been asked to
 480  * switch to the alternate screen, we must bring most of its
 481  * configuration from the main screen and erase the contents of the
 482  * alternate screen completely. (This is even true if we're already
 483  * on it! Blame xterm.)
 484  */
 485 static void swap_screen(Terminal *term, int which, int reset, int keep_cur_pos)
 486 {
 487     int t;
 488     tree234 *ttr;
 489
 490     if (!which)
 491         reset = FALSE;                 /* do no weird resetting if which==0 */
 492
 493     if (which != term->alt_which) {
 494         term->alt_which = which;
 495
 496         ttr = term->alt_screen;
 497         term->alt_screen = term->screen;
 498         term->screen = ttr;
 499         t = term->curs.x;
 500         if (!reset && !keep_cur_pos)
 501             term->curs.x = term->alt_x;
 502         term->alt_x = t;
 503         t = term->curs.y;
 504         if (!reset && !keep_cur_pos)
 505             term->curs.y = term->alt_y;
 506         term->alt_y = t;
 507         t = term->marg_t;
 508         if (!reset) term->marg_t = term->alt_t;
 509         term->alt_t = t;
 510         t = term->marg_b;
 511         if (!reset) term->marg_b = term->alt_b;
 512         term->alt_b = t;
 513         t = term->dec_om;
 514         if (!reset) term->dec_om = term->alt_om;
 515         term->alt_om = t;
 516         t = term->wrap;
 517         if (!reset) term->wrap = term->alt_wrap;
 518         term->alt_wrap = t;
 519         t = term->wrapnext;
 520         if (!reset) term->wrapnext = term->alt_wnext;
 521         term->alt_wnext = t;
 522         t = term->insert;
 523         if (!reset) term->insert = term->alt_ins;
 524         term->alt_ins = t;
 525         t = term->cset;
 526         if (!reset) term->cset = term->alt_cset;
 527         term->alt_cset = t;
 528         t = term->utf;
 529         if (!reset) term->utf = term->alt_utf;
 530         term->alt_utf = t;
 531         t = term->sco_acs;
 532         if (!reset) term->sco_acs = term->alt_sco_acs;
 533         term->alt_sco_acs = t;
 534     }
 535
 536     if (reset && term->screen) {
 537         /*
 538          * Yes, this _is_ supposed to honour background-colour-erase.
 539          */
 540         erase_lots(term, FALSE, TRUE, TRUE);
 541     }
 542
 543     /*
 544      * This might not be possible if we're called during
 545      * initialisation.
 546      */
 547     if (term->screen)
 548         fix_cpos;
 549 }
 550
 551 /*
 552  * Update the scroll bar.
 553  */
 554 static void update_sbar(Terminal *term)
 555 {
 556     int nscroll;
 557
 558     nscroll = count234(term->scrollback);
 559
 560     set_sbar(nscroll + term->rows, nscroll + term->disptop, term->rows);
 561 }
 562
 563 /*
 564  * Check whether the region bounded by the two pointers intersects
 565  * the scroll region, and de-select the on-screen selection if so.
 566  */
 567 static void check_selection(Terminal *term, pos from, pos to)
 568 {
 569     if (poslt(from, term->selend) && poslt(term->selstart, to))
 570         deselect(term);
 571 }
 572
 573 /*
 574  * Scroll the screen. (`lines' is +ve for scrolling forward, -ve
 575  * for backward.) `sb' is TRUE if the scrolling is permitted to
 576  * affect the scrollback buffer.
 577  *
 578  * NB this function invalidates all pointers into lines of the
 579  * screen data structures. In particular, you MUST call fix_cpos
 580  * after calling scroll() and before doing anything else that
 581  * uses the cpos shortcut pointer.
 582  */
 583 static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
 584 {
 585     unsigned long *line, *line2;
 586     int i, seltop;
 587
 588     if (topline != 0 || term->alt_which != 0)
 589         sb = FALSE;
 590
 591     if (lines < 0) {
 592         while (lines < 0) {
 593             line = delpos234(term->screen, botline);
 594             line = resizeline(line, term->cols);
 595             for (i = 0; i < term->cols; i++)
 596                 line[i + 1] = term->erase_char;
 597             line[term->cols + 1] = 0;
 598             addpos234(term->screen, line, topline);
 599
 600             if (term->selstart.y >= topline && term->selstart.y <= botline) {
 601                 term->selstart.y++;
 602                 if (term->selstart.y > botline) {
 603                     term->selstart.y = botline;
 604                     term->selstart.x = 0;
 605                 }
 606             }
 607             if (term->selend.y >= topline && term->selend.y <= botline) {
 608                 term->selend.y++;
 609                 if (term->selend.y > botline) {
 610                     term->selend.y = botline;
 611                     term->selend.x = 0;
 612                 }
 613             }
 614
 615             lines++;
 616         }
 617     } else {
 618         while (lines > 0) {
 619             line = delpos234(term->screen, topline);
 620             if (sb && term->savelines > 0) {
 621                 int sblen = count234(term->scrollback);
 622                 /*
 623                  * We must add this line to the scrollback. We'll
 624                  * remove a line from the top of the scrollback to
 625                  * replace it, or allocate a new one if the
 626                  * scrollback isn't full.
 627                  */
 628                 if (sblen == term->savelines) {
 629                     sblen--, line2 = delpos234(term->scrollback, 0);
 630                 } else {
 631                     line2 = smalloc(TSIZE * (term->cols + 2));
 632                     line2[0] = term->cols;
 633                 }
 634                 addpos234(term->scrollback, line, sblen);
 635                 line = line2;
 636
 637                 /*
 638                  * If the user is currently looking at part of the
 639                  * scrollback, and they haven't enabled any options
 640                  * that are going to reset the scrollback as a
 641                  * result of this movement, then the chances are
 642                  * they'd like to keep looking at the same line. So
 643                  * we move their viewpoint at the same rate as the
 644                  * scroll, at least until their viewpoint hits the
 645                  * top end of the scrollback buffer, at which point
 646                  * we don't have the choice any more.
 647                  *
 648                  * Thanks to Jan Holmen Holsten for the idea and
 649                  * initial implementation.
 650                  */
 651                 if (term->disptop > -term->savelines && term->disptop < 0)
 652                     term->disptop--;
 653             }
 654             line = resizeline(line, term->cols);
 655             for (i = 0; i < term->cols; i++)
 656                 line[i + 1] = term->erase_char;
 657             line[term->cols + 1] = 0;
 658             addpos234(term->screen, line, botline);
 659
 660             /*
 661              * If the selection endpoints move into the scrollback,
 662              * we keep them moving until they hit the top. However,
 663              * of course, if the line _hasn't_ moved into the
 664              * scrollback then we don't do this, and cut them off
 665              * at the top of the scroll region.
 666              *
 667              * This applies to selstart and selend (for an existing
 668              * selection), and also selanchor (for one being
 669              * selected as we speak).
 670              */
 671             seltop = sb ? -term->savelines : topline;
 672
 673             if (term->selstart.y >= seltop &&
 674                 term->selstart.y <= botline) {
 675                 term->selstart.y--;
 676                 if (term->selstart.y < seltop) {
 677                     term->selstart.y = seltop;
 678                     term->selstart.x = 0;
 679                 }
 680             }
 681             if (term->selend.y >= seltop && term->selend.y <= botline) {
 682                 term->selend.y--;
 683                 if (term->selend.y < seltop) {
 684                     term->selend.y = seltop;
 685                     term->selend.x = 0;
 686                 }
 687             }
 688             if (term->selanchor.y >= seltop && term->selanchor.y <= botline) {
 689                 term->selanchor.y--;
 690                 if (term->selanchor.y < seltop) {
 691                     term->selanchor.y = seltop;
 692                     term->selanchor.x = 0;
 693                 }
 694             }
 695
 696             lines--;
 697         }
 698     }
 699 }
 700
 701 /*
 702  * Move the cursor to a given position, clipping at boundaries. We
 703  * may or may not want to clip at the scroll margin: marg_clip is 0
 704  * not to, 1 to disallow _passing_ the margins, and 2 to disallow
 705  * even _being_ outside the margins.
 706  */
 707 static void move(Terminal *term, int x, int y, int marg_clip)
 708 {
 709     if (x < 0)
 710         x = 0;
 711     if (x >= term->cols)
 712         x = term->cols - 1;
 713     if (marg_clip) {
 714         if ((term->curs.y >= term->marg_t || marg_clip == 2) &&
 715             y < term->marg_t)
 716             y = term->marg_t;
 717         if ((term->curs.y <= term->marg_b || marg_clip == 2) &&
 718             y > term->marg_b)
 719             y = term->marg_b;
 720     }
 721     if (y < 0)
 722         y = 0;
 723     if (y >= term->rows)
 724         y = term->rows - 1;
 725     term->curs.x = x;
 726     term->curs.y = y;
 727     fix_cpos;
 728     term->wrapnext = FALSE;
 729 }
 730
 731 /*
 732  * Save or restore the cursor and SGR mode.
 733  */
 734 static void save_cursor(Terminal *term, int save)
 735 {
 736     if (save) {
 737         term->savecurs = term->curs;
 738         term->save_attr = term->curr_attr;
 739         term->save_cset = term->cset;
 740         term->save_utf = term->utf;
 741         term->save_wnext = term->wrapnext;
 742         term->save_csattr = term->cset_attr[term->cset];
 743         term->save_sco_acs = term->sco_acs;
 744     } else {
 745         term->curs = term->savecurs;
 746         /* Make sure the window hasn't shrunk since the save */
 747         if (term->curs.x >= term->cols)
 748             term->curs.x = term->cols - 1;
 749         if (term->curs.y >= term->rows)
 750             term->curs.y = term->rows - 1;
 751
 752         term->curr_attr = term->save_attr;
 753         term->cset = term->save_cset;
 754         term->utf = term->save_utf;
 755         term->wrapnext = term->save_wnext;
 756         /*
 757          * wrapnext might reset to False if the x position is no
 758          * longer at the rightmost edge.
 759          */
 760         if (term->wrapnext && term->curs.x < term->cols-1)
 761             term->wrapnext = FALSE;
 762         term->cset_attr[term->cset] = term->save_csattr;
 763         term->sco_acs = term->save_sco_acs;
 764         fix_cpos;
 765         if (term->use_bce)
 766             term->erase_char = (' ' | ATTR_ASCII |
 767                                 (term->curr_attr &
 768                                  (ATTR_FGMASK | ATTR_BGMASK)));
 769     }
 770 }
 771
 772 /*
 773  * Erase a large portion of the screen: the whole screen, or the
 774  * whole line, or parts thereof.
 775  */
 776 static void erase_lots(Terminal *term,
 777                        int line_only, int from_begin, int to_end)
 778 {
 779     pos start, end;
 780     int erase_lattr;
 781     unsigned long *ldata;
 782
 783     if (line_only) {
 784         start.y = term->curs.y;
 785         start.x = 0;
 786         end.y = term->curs.y + 1;
 787         end.x = 0;
 788         erase_lattr = FALSE;
 789     } else {
 790         start.y = 0;
 791         start.x = 0;
 792         end.y = term->rows;
 793         end.x = 0;
 794         erase_lattr = TRUE;
 795     }
 796     if (!from_begin) {
 797         start = term->curs;
 798     }
 799     if (!to_end) {
 800         end = term->curs;
 801         incpos(end);
 802     }
 803     check_selection(term, start, end);
 804
 805     /* Clear screen also forces a full window redraw, just in case. */
 806     if (start.y == 0 && start.x == 0 && end.y == term->rows)
 807         term_invalidate(term);
 808
 809     ldata = lineptr(start.y);
 810     while (poslt(start, end)) {
 811         if (start.x == term->cols && !erase_lattr)
 812             ldata[start.x] &= ~LATTR_WRAPPED;
 813         else
 814             ldata[start.x] = term->erase_char;
 815         if (incpos(start) && start.y < term->rows)
 816             ldata = lineptr(start.y);
 817     }
 818 }
 819
 820 /*
 821  * Insert or delete characters within the current line. n is +ve if
 822  * insertion is desired, and -ve for deletion.
 823  */
 824 static void insch(Terminal *term, int n)
 825 {
 826     int dir = (n < 0 ? -1 : +1);
 827     int m;
 828     pos cursplus;
 829     unsigned long *ldata;
 830
 831     n = (n < 0 ? -n : n);
 832     if (n > term->cols - term->curs.x)
 833         n = term->cols - term->curs.x;
 834     m = term->cols - term->curs.x - n;
 835     cursplus.y = term->curs.y;
 836     cursplus.x = term->curs.x + n;
 837     check_selection(term, term->curs, cursplus);
 838     ldata = lineptr(term->curs.y);
 839     if (dir < 0) {
 840         memmove(ldata + term->curs.x, ldata + term->curs.x + n, m * TSIZE);
 841         while (n--)
 842             ldata[term->curs.x + m++] = term->erase_char;
 843     } else {
 844         memmove(ldata + term->curs.x + n, ldata + term->curs.x, m * TSIZE);
 845         while (n--)
 846             ldata[term->curs.x + n] = term->erase_char;
 847     }
 848 }
 849
 850 /*
 851  * Toggle terminal mode `mode' to state `state'. (`query' indicates
 852  * whether the mode is a DEC private one or a normal one.)
 853  */
 854 static void toggle_mode(Terminal *term, int mode, int query, int state)
 855 {
 856     unsigned long ticks;
 857
 858     if (query)
 859         switch (mode) {
 860           case 1:                      /* application cursor keys */
 861             term->app_cursor_keys = state;
 862             break;
 863           case 2:                      /* VT52 mode */
 864             term->vt52_mode = !state;
 865             if (term->vt52_mode) {
 866                 term->blink_is_real = FALSE;
 867                 term->vt52_bold = FALSE;
 868             } else {
 869                 term->blink_is_real = cfg.blinktext;
 870             }
 871             break;
 872           case 3:                      /* 80/132 columns */
 873             deselect(term);
 874             if (!cfg.no_remote_resize)
 875                 request_resize(state ? 132 : 80, term->rows);
 876             term->reset_132 = state;
 877             break;
 878           case 5:                      /* reverse video */
 879             /*
 880              * Toggle reverse video. If we receive an OFF within the
 881              * visual bell timeout period after an ON, we trigger an
 882              * effective visual bell, so that ESC[?5hESC[?5l will
 883              * always be an actually _visible_ visual bell.
 884              */
 885             ticks = GETTICKCOUNT();
 886             /* turn off a previous vbell to avoid inconsistencies */
 887             if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
 888                 term->in_vbell = FALSE;
 889             if (term->rvideo && !state &&    /* we're turning it off... */
 890                 (ticks - term->rvbell_startpoint) < VBELL_TIMEOUT) {/*...soon*/
 891                 /* If there's no vbell timeout already, or this one lasts
 892                  * longer, replace vbell_timeout with ours. */
 893                 if (!term->in_vbell ||
 894                     (term->rvbell_startpoint - term->vbell_startpoint <
 895                      VBELL_TIMEOUT))
 896                     term->vbell_startpoint = term->rvbell_startpoint;
 897                 term->in_vbell = TRUE; /* may clear rvideo but set in_vbell */
 898             } else if (!term->rvideo && state) {
 899                 /* This is an ON, so we notice the time and save it. */
 900                 term->rvbell_startpoint = ticks;
 901             }
 902             term->rvideo = state;
 903             term->seen_disp_event = TRUE;
 904             if (state)
 905                 term_update(term);
 906             break;
 907           case 6:                      /* DEC origin mode */
 908             term->dec_om = state;
 909             break;
 910           case 7:                      /* auto wrap */
 911             term->wrap = state;
 912             break;
 913           case 8:                      /* auto key repeat */
 914             term->repeat_off = !state;
 915             break;
 916           case 10:                     /* set local edit mode */
 917             term->term_editing = state;
 918             ldisc_send(NULL, 0, 0);    /* cause ldisc to notice changes */
 919             break;
 920           case 25:                     /* enable/disable cursor */
 921             compatibility2(OTHER, VT220);
 922             term->cursor_on = state;
 923             term->seen_disp_event = TRUE;
 924             break;
 925           case 47:                     /* alternate screen */
 926             compatibility(OTHER);
 927             deselect(term);
 928             swap_screen(term, cfg.no_alt_screen ? 0 : state, FALSE, FALSE);
 929             term->disptop = 0;
 930             break;
 931           case 1000:                   /* xterm mouse 1 */
 932             term->xterm_mouse = state ? 1 : 0;
 933             set_raw_mouse_mode(state);
 934             break;
 935           case 1002:                   /* xterm mouse 2 */
 936             term->xterm_mouse = state ? 2 : 0;
 937             set_raw_mouse_mode(state);
 938             break;
 939           case 1047:                   /* alternate screen */
 940             compatibility(OTHER);
 941             deselect(term);
 942             swap_screen(term, cfg.no_alt_screen ? 0 : state, TRUE, TRUE);
 943             term->disptop = 0;
 944             break;
 945           case 1048:                   /* save/restore cursor */
 946             save_cursor(term, state);
 947             if (!state) term->seen_disp_event = TRUE;
 948             break;
 949           case 1049:                   /* cursor & alternate screen */
 950             if (state)
 951                 save_cursor(term, state);
 952             if (!state) term->seen_disp_event = TRUE;
 953             compatibility(OTHER);
 954             deselect(term);
 955             swap_screen(term, cfg.no_alt_screen ? 0 : state, TRUE, FALSE);
 956             if (!state)
 957                 save_cursor(term, state);
 958             term->disptop = 0;
 959             break;
 960     } else
 961         switch (mode) {
 962           case 4:                      /* set insert mode */
 963             compatibility(VT102);
 964             term->insert = state;
 965             break;
 966           case 12:                     /* set echo mode */
 967             term->term_echoing = !state;
 968             ldisc_send(NULL, 0, 0);    /* cause ldisc to notice changes */
 969             break;
 970           case 20:                     /* Return sends ... */
 971             term->cr_lf_return = state;
 972             break;
 973           case 34:                     /* Make cursor BIG */
 974             compatibility2(OTHER, VT220);
 975             term->big_cursor = !state;
 976         }
 977 }
 978
 979 /*
 980  * Process an OSC sequence: set window title or icon name.
 981  */
 982 static void do_osc(Terminal *term)
 983 {
 984     if (term->osc_w) {
 985         while (term->osc_strlen--)
 986             term->wordness[(unsigned char)
 987                 term->osc_string[term->osc_strlen]] = term->esc_args[0];
 988     } else {
 989         term->osc_string[term->osc_strlen] = '\0';
 990         switch (term->esc_args[0]) {
 991           case 0:
 992           case 1:
 993             if (!cfg.no_remote_wintitle)
 994                 set_icon(term->osc_string);
 995             if (term->esc_args[0] == 1)
 996                 break;
 997             /* fall through: parameter 0 means set both */
 998           case 2:
 999           case 21:
1000             if (!cfg.no_remote_wintitle)
1001                 set_title(term->osc_string);
1002             break;
1003         }
1004     }
1005 }
1006
1007 /*
1008  * ANSI printing routines.
1009  */
1010 static void term_print_setup(Terminal *term)
1011 {
1012     bufchain_clear(&term->printer_buf);
1013     term->print_job = printer_start_job(cfg.printer);
1014 }
1015 static void term_print_flush(Terminal *term)
1016 {
1017     void *data;
1018     int len;
1019     int size;
1020     while ((size = bufchain_size(&term->printer_buf)) > 5) {
1021         bufchain_prefix(&term->printer_buf, &data, &len);
1022         if (len > size-5)
1023             len = size-5;
1024         printer_job_data(term->print_job, data, len);
1025         bufchain_consume(&term->printer_buf, len);
1026     }
1027 }
1028 static void term_print_finish(Terminal *term)
1029 {
1030     void *data;
1031     int len, size;
1032     char c;
1033
1034     if (!term->printing && !term->only_printing)
1035         return;                        /* we need do nothing */
1036
1037     term_print_flush(term);
1038     while ((size = bufchain_size(&term->printer_buf)) > 0) {
1039         bufchain_prefix(&term->printer_buf, &data, &len);
1040         c = *(char *)data;
1041         if (c == '\033' || c == '\233') {
1042             bufchain_consume(&term->printer_buf, size);
1043             break;
1044         } else {
1045             printer_job_data(term->print_job, &c, 1);
1046             bufchain_consume(&term->printer_buf, 1);
1047         }
1048     }
1049     printer_finish_job(term->print_job);
1050     term->print_job = NULL;
1051     term->printing = term->only_printing = FALSE;
1052 }
1053
1054 /*
1055  * Remove everything currently in `inbuf' and stick it up on the
1056  * in-memory display. There's a big state machine in here to
1057  * process escape sequences...
1058  */
1059 void term_out(Terminal *term)
1060 {
1061     int c, unget;
1062     unsigned char localbuf[256], *chars;
1063     int nchars = 0;
1064
1065     unget = -1;
1066
1067     chars = NULL;                      /* placate compiler warnings */
1068     while (nchars > 0 || bufchain_size(&term->inbuf) > 0) {
1069         if (unget == -1) {
1070             if (nchars == 0) {
1071                 void *ret;
1072                 bufchain_prefix(&term->inbuf, &ret, &nchars);
1073                 if (nchars > sizeof(localbuf))
1074                     nchars = sizeof(localbuf);
1075                 memcpy(localbuf, ret, nchars);
1076                 bufchain_consume(&term->inbuf, nchars);
1077                 chars = localbuf;
1078                 assert(chars != NULL);
1079             }
1080             c = *chars++;
1081             nchars--;
1082
1083             /*
1084              * Optionally log the session traffic to a file. Useful for
1085              * debugging and possibly also useful for actual logging.
1086              */
1087             if (cfg.logtype == LGTYP_DEBUG)
1088                 logtraffic((unsigned char) c, LGTYP_DEBUG);
1089         } else {
1090             c = unget;
1091             unget = -1;
1092         }
1093
1094         /* Note only VT220+ are 8-bit VT102 is seven bit, it shouldn't even
1095          * be able to display 8-bit characters, but I'll let that go 'cause
1096          * of i18n.
1097          */
1098
1099         /*
1100          * If we're printing, add the character to the printer
1101          * buffer.
1102          */
1103         if (term->printing) {
1104             bufchain_add(&term->printer_buf, &c, 1);
1105
1106             /*
1107              * If we're in print-only mode, we use a much simpler
1108              * state machine designed only to recognise the ESC[4i
1109              * termination sequence.
1110              */
1111             if (term->only_printing) {
1112                 if (c == '\033')
1113                     term->print_state = 1;
1114                 else if (c == (unsigned char)'\233')
1115                     term->print_state = 2;
1116                 else if (c == '[' && term->print_state == 1)
1117                     term->print_state = 2;
1118                 else if (c == '4' && term->print_state == 2)
1119                     term->print_state = 3;
1120                 else if (c == 'i' && term->print_state == 3)
1121                     term->print_state = 4;
1122                 else
1123                     term->print_state = 0;
1124                 if (term->print_state == 4) {
1125                     term_print_finish(term);
1126                 }
1127                 continue;
1128             }
1129         }
1130
1131         /* First see about all those translations. */
1132         if (term->termstate == TOPLEVEL) {
1133             if (in_utf(term))
1134                 switch (term->utf_state) {
1135                   case 0:
1136                     if (c < 0x80) {
1137                         /* UTF-8 must be stateless so we ignore iso2022. */
1138                         if (unitab_ctrl[c] != 0xFF)
1139                              c = unitab_ctrl[c];
1140                         else c = ((unsigned char)c) | ATTR_ASCII;
1141                         break;
1142                     } else if ((c & 0xe0) == 0xc0) {
1143                         term->utf_size = term->utf_state = 1;
1144                         term->utf_char = (c & 0x1f);
1145                     } else if ((c & 0xf0) == 0xe0) {
1146                         term->utf_size = term->utf_state = 2;
1147                         term->utf_char = (c & 0x0f);
1148                     } else if ((c & 0xf8) == 0xf0) {
1149                         term->utf_size = term->utf_state = 3;
1150                         term->utf_char = (c & 0x07);
1151                     } else if ((c & 0xfc) == 0xf8) {
1152                         term->utf_size = term->utf_state = 4;
1153                         term->utf_char = (c & 0x03);
1154                     } else if ((c & 0xfe) == 0xfc) {
1155                         term->utf_size = term->utf_state = 5;
1156                         term->utf_char = (c & 0x01);
1157                     } else {
1158                         c = UCSERR;
1159                         break;
1160                     }
1161                     continue;
1162                   case 1:
1163                   case 2:
1164                   case 3:
1165                   case 4:
1166                   case 5:
1167                     if ((c & 0xC0) != 0x80) {
1168                         unget = c;
1169                         c = UCSERR;
1170                         term->utf_state = 0;
1171                         break;
1172                     }
1173                     term->utf_char = (term->utf_char << 6) | (c & 0x3f);
1174                     if (--term->utf_state)
1175                         continue;
1176
1177                     c = term->utf_char;
1178
1179                     /* Is somebody trying to be evil! */
1180                     if (c < 0x80 ||
1181                         (c < 0x800 && term->utf_size >= 2) ||
1182                         (c < 0x10000 && term->utf_size >= 3) ||
1183                         (c < 0x200000 && term->utf_size >= 4) ||
1184                         (c < 0x4000000 && term->utf_size >= 5))
1185                         c = UCSERR;
1186
1187                     /* Unicode line separator and paragraph separator are CR-LF */
1188                     if (c == 0x2028 || c == 0x2029)
1189                         c = 0x85;
1190
1191                     /* High controls are probably a Baaad idea too. */
1192                     if (c < 0xA0)
1193                         c = 0xFFFD;
1194
1195                     /* The UTF-16 surrogates are not nice either. */
1196                     /*       The standard give the option of decoding these:
1197                      *       I don't want to! */
1198                     if (c >= 0xD800 && c < 0xE000)
1199                         c = UCSERR;
1200
1201                     /* ISO 10646 characters now limited to UTF-16 range. */
1202                     if (c > 0x10FFFF)
1203                         c = UCSERR;
1204
1205                     /* This is currently a TagPhobic application.. */
1206                     if (c >= 0xE0000 && c <= 0xE007F)
1207                         continue;
1208
1209                     /* U+FEFF is best seen as a null. */
1210                     if (c == 0xFEFF)
1211                         continue;
1212                     /* But U+FFFE is an error. */
1213                     if (c == 0xFFFE || c == 0xFFFF)
1214                         c = UCSERR;
1215
1216                     /* Oops this is a 16bit implementation */
1217                     if (c >= 0x10000)
1218                         c = 0xFFFD;
1219                     break;
1220             }
1221             /* Are we in the nasty ACS mode? Note: no sco in utf mode. */
1222             else if(term->sco_acs &&
1223                     (c!='\033' && c!='\n' && c!='\r' && c!='\b'))
1224             {
1225                if (term->sco_acs == 2) c ^= 0x80;
1226                c |= ATTR_SCOACS;
1227             } else {
1228                 switch (term->cset_attr[term->cset]) {
1229                     /*
1230                      * Linedraw characters are different from 'ESC ( B'
1231                      * only for a small range. For ones outside that
1232                      * range, make sure we use the same font as well as
1233                      * the same encoding.
1234                      */
1235                   case ATTR_LINEDRW:
1236                     if (unitab_ctrl[c] != 0xFF)
1237                         c = unitab_ctrl[c];
1238                     else
1239                         c = ((unsigned char) c) | ATTR_LINEDRW;
1240                     break;
1241
1242                   case ATTR_GBCHR:
1243                     /* If UK-ASCII, make the '#' a LineDraw Pound */
1244                     if (c == '#') {
1245                         c = '}' | ATTR_LINEDRW;
1246                         break;
1247                     }
1248                   /*FALLTHROUGH*/ case ATTR_ASCII:
1249                     if (unitab_ctrl[c] != 0xFF)
1250                         c = unitab_ctrl[c];
1251                     else
1252                         c = ((unsigned char) c) | ATTR_ASCII;
1253                     break;
1254                 case ATTR_SCOACS:
1255                     if (c>=' ') c = ((unsigned char)c) | ATTR_SCOACS;
1256                     break;
1257                 }
1258             }
1259         }
1260
1261         /* How about C1 controls ? */
1262         if ((c & -32) == 0x80 && term->termstate < DO_CTRLS &&
1263             !term->vt52_mode && has_compat(VT220)) {
1264             term->termstate = SEEN_ESC;
1265             term->esc_query = FALSE;
1266             c = '@' + (c & 0x1F);
1267         }
1268
1269         /* Or the GL control. */
1270         if (c == '\177' && term->termstate < DO_CTRLS && has_compat(OTHER)) {
1271             if (term->curs.x && !term->wrapnext)
1272                 term->curs.x--;
1273             term->wrapnext = FALSE;
1274             fix_cpos;
1275             if (!cfg.no_dbackspace)    /* destructive bksp might be disabled */
1276                 *term->cpos = (' ' | term->curr_attr | ATTR_ASCII);
1277         } else
1278             /* Or normal C0 controls. */
1279         if ((c & -32) == 0 && term->termstate < DO_CTRLS) {
1280             switch (c) {
1281               case '\005':             /* terminal type query */
1282                 /* Strictly speaking this is VT100 but a VT100 defaults to
1283                  * no response. Other terminals respond at their option.
1284                  *
1285                  * Don't put a CR in the default string as this tends to
1286                  * upset some weird software.
1287                  *
1288                  * An xterm returns "xterm" (5 characters)
1289                  */
1290                 compatibility(ANSIMIN);
1291                 {
1292                     char abuf[256], *s, *d;
1293                     int state = 0;
1294                     for (s = cfg.answerback, d = abuf; *s; s++) {
1295                         if (state) {
1296                             if (*s >= 'a' && *s <= 'z')
1297                                 *d++ = (*s - ('a' - 1));
1298                             else if ((*s >= '@' && *s <= '_') ||
1299                                      *s == '?' || (*s & 0x80))
1300                                 *d++ = ('@' ^ *s);
1301                             else if (*s == '~')
1302                                 *d++ = '^';
1303                             state = 0;
1304                         } else if (*s == '^') {
1305                             state = 1;
1306                         } else
1307                             *d++ = *s;
1308                     }
1309                     lpage_send(DEFAULT_CODEPAGE, abuf, d - abuf, 0);
1310                 }
1311                 break;
1312               case '\007':
1313                 {
1314                     struct beeptime *newbeep;
1315                     unsigned long ticks;
1316
1317                     ticks = GETTICKCOUNT();
1318
1319                     if (!term->beep_overloaded) {
1320                         newbeep = smalloc(sizeof(struct beeptime));
1321                         newbeep->ticks = ticks;
1322                         newbeep->next = NULL;
1323                         if (!term->beephead)
1324                             term->beephead = newbeep;
1325                         else
1326                             term->beeptail->next = newbeep;
1327                         term->beeptail = newbeep;
1328                         term->nbeeps++;
1329                     }
1330
1331                     /*
1332                      * Throw out any beeps that happened more than
1333                      * t seconds ago.
1334                      */
1335                     while (term->beephead &&
1336                            term->beephead->ticks < ticks - cfg.bellovl_t) {
1337                         struct beeptime *tmp = term->beephead;
1338                         term->beephead = tmp->next;
1339                         sfree(tmp);
1340                         if (!term->beephead)
1341                             term->beeptail = NULL;
1342                         term->nbeeps--;
1343                     }
1344
1345                     if (cfg.bellovl && term->beep_overloaded &&
1346                         ticks - term->lastbeep >= (unsigned)cfg.bellovl_s) {
1347                         /*
1348                          * If we're currently overloaded and the
1349                          * last beep was more than s seconds ago,
1350                          * leave overload mode.
1351                          */
1352                         term->beep_overloaded = FALSE;
1353                     } else if (cfg.bellovl && !term->beep_overloaded &&
1354                                term->nbeeps >= cfg.bellovl_n) {
1355                         /*
1356                          * Now, if we have n or more beeps
1357                          * remaining in the queue, go into overload
1358                          * mode.
1359                          */
1360                         term->beep_overloaded = TRUE;
1361                     }
1362                     term->lastbeep = ticks;
1363
1364                     /*
1365                      * Perform an actual beep if we're not overloaded.
1366                      */
1367                     if (!cfg.bellovl || !term->beep_overloaded) {
1368                         if (cfg.beep == BELL_VISUAL) {
1369                             term->in_vbell = TRUE;
1370                             term->vbell_startpoint = ticks;
1371                             term_update(term);
1372                         } else
1373                             beep(cfg.beep);
1374                     }
1375                     term->disptop = 0;
1376                 }
1377                 break;
1378               case '\b':
1379                 if (term->curs.x == 0 &&
1380                     (term->curs.y == 0 || term->wrap == 0))
1381                     /* do nothing */ ;
1382                 else if (term->curs.x == 0 && term->curs.y > 0)
1383                     term->curs.x = term->cols - 1, term->curs.y--;
1384                 else if (term->wrapnext)
1385                     term->wrapnext = FALSE;
1386                 else
1387                     term->curs.x--;
1388                 fix_cpos;
1389                 term->seen_disp_event = TRUE;
1390                 break;
1391               case '\016':
1392                 compatibility(VT100);
1393                 term->cset = 1;
1394                 break;
1395               case '\017':
1396                 compatibility(VT100);
1397                 term->cset = 0;
1398                 break;
1399               case '\033':
1400                 if (term->vt52_mode)
1401                     term->termstate = VT52_ESC;
1402                 else {
1403                     compatibility(ANSIMIN);
1404                     term->termstate = SEEN_ESC;
1405                     term->esc_query = FALSE;
1406                 }
1407                 break;
1408               case '\r':
1409                 term->curs.x = 0;
1410                 term->wrapnext = FALSE;
1411                 fix_cpos;
1412                 term->seen_disp_event = TRUE;
1413                 term->paste_hold = 0;
1414                 logtraffic((unsigned char) c, LGTYP_ASCII);
1415                 break;
1416               case '\014':
1417                 if (has_compat(SCOANSI)) {
1418                     move(term, 0, 0, 0);
1419                     erase_lots(term, FALSE, FALSE, TRUE);
1420                     term->disptop = 0;
1421                     term->wrapnext = FALSE;
1422                     term->seen_disp_event = 1;
1423                     break;
1424                 }
1425               case '\013':
1426                 compatibility(VT100);
1427               case '\n':
1428                 if (term->curs.y == term->marg_b)
1429                     scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1430                 else if (term->curs.y < term->rows - 1)
1431                     term->curs.y++;
1432                 if (cfg.lfhascr)
1433                     term->curs.x = 0;
1434                 fix_cpos;
1435                 term->wrapnext = FALSE;
1436                 term->seen_disp_event = 1;
1437                 term->paste_hold = 0;
1438                 logtraffic((unsigned char) c, LGTYP_ASCII);
1439                 break;
1440               case '\t':
1441                 {
1442                     pos old_curs = term->curs;
1443                     unsigned long *ldata = lineptr(term->curs.y);
1444
1445                     do {
1446                         term->curs.x++;
1447                     } while (term->curs.x < term->cols - 1 &&
1448                              !term->tabs[term->curs.x]);
1449
1450                     if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM) {
1451                         if (term->curs.x >= term->cols / 2)
1452                             term->curs.x = term->cols / 2 - 1;
1453                     } else {
1454                         if (term->curs.x >= term->cols)
1455                             term->curs.x = term->cols - 1;
1456                     }
1457
1458                     fix_cpos;
1459                     check_selection(term, old_curs, term->curs);
1460                 }
1461                 term->seen_disp_event = TRUE;
1462                 break;
1463             }
1464         } else
1465             switch (term->termstate) {
1466               case TOPLEVEL:
1467                 /* Only graphic characters get this far;
1468                  * ctrls are stripped above */
1469                 if (term->wrapnext && term->wrap) {
1470                     term->cpos[1] |= LATTR_WRAPPED;
1471                     if (term->curs.y == term->marg_b)
1472                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1473                     else if (term->curs.y < term->rows - 1)
1474                         term->curs.y++;
1475                     term->curs.x = 0;
1476                     fix_cpos;
1477                     term->wrapnext = FALSE;
1478                 }
1479                 if (term->insert)
1480                     insch(term, 1);
1481                 if (term->selstate != NO_SELECTION) {
1482                     pos cursplus = term->curs;
1483                     incpos(cursplus);
1484                     check_selection(term, term->curs, cursplus);
1485                 }
1486                 if ((c & CSET_MASK) == ATTR_ASCII || (c & CSET_MASK) == 0)
1487                     logtraffic((unsigned char) c, LGTYP_ASCII);
1488                 {
1489                     extern int wcwidth(wchar_t ucs);
1490                     int width = 0;
1491                     if (DIRECT_CHAR(c))
1492                         width = 1;
1493                     if (!width)
1494                         width = wcwidth((wchar_t) c);
1495                     switch (width) {
1496                       case 2:
1497                         *term->cpos++ = c | term->curr_attr;
1498                         if (++term->curs.x == term->cols) {
1499                             *term->cpos |= LATTR_WRAPPED;
1500                             if (term->curs.y == term->marg_b)
1501                                 scroll(term, term->marg_t, term->marg_b,
1502                                        1, TRUE);
1503                             else if (term->curs.y < term->rows - 1)
1504                                 term->curs.y++;
1505                             term->curs.x = 0;
1506                             fix_cpos;
1507                         }
1508                         *term->cpos++ = UCSWIDE | term->curr_attr;
1509                         break;
1510                       case 1:
1511                         *term->cpos++ = c | term->curr_attr;
1512                         break;
1513                       default:
1514                         continue;
1515                     }
1516                 }
1517                 term->curs.x++;
1518                 if (term->curs.x == term->cols) {
1519                     term->cpos--;
1520                     term->curs.x--;
1521                     term->wrapnext = TRUE;
1522                     if (term->wrap && term->vt52_mode) {
1523                         term->cpos[1] |= LATTR_WRAPPED;
1524                         if (term->curs.y == term->marg_b)
1525                             scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1526                         else if (term->curs.y < term->rows - 1)
1527                             term->curs.y++;
1528                         term->curs.x = 0;
1529                         fix_cpos;
1530                         term->wrapnext = FALSE;
1531                     }
1532                 }
1533                 term->seen_disp_event = 1;
1534                 break;
1535
1536               case OSC_MAYBE_ST:
1537                 /*
1538                  * This state is virtually identical to SEEN_ESC, with the
1539                  * exception that we have an OSC sequence in the pipeline,
1540                  * and _if_ we see a backslash, we process it.
1541                  */
1542                 if (c == '\\') {
1543                     do_osc(term);
1544                     term->termstate = TOPLEVEL;
1545                     break;
1546                 }
1547                 /* else fall through */
1548               case SEEN_ESC:
1549                 if (c >= ' ' && c <= '/') {
1550                     if (term->esc_query)
1551                         term->esc_query = -1;
1552                     else
1553                         term->esc_query = c;
1554                     break;
1555                 }
1556                 term->termstate = TOPLEVEL;
1557                 switch (ANSI(c, term->esc_query)) {
1558                   case '[':            /* enter CSI mode */
1559                     term->termstate = SEEN_CSI;
1560                     term->esc_nargs = 1;
1561                     term->esc_args[0] = ARG_DEFAULT;
1562                     term->esc_query = FALSE;
1563                     break;
1564                   case ']':            /* xterm escape sequences */
1565                     /* Compatibility is nasty here, xterm, linux, decterm yuk! */
1566                     compatibility(OTHER);
1567                     term->termstate = SEEN_OSC;
1568                     term->esc_args[0] = 0;
1569                     break;
1570                   case '7':            /* save cursor */
1571                     compatibility(VT100);
1572                     save_cursor(term, TRUE);
1573                     break;
1574                   case '8':            /* restore cursor */
1575                     compatibility(VT100);
1576                     save_cursor(term, FALSE);
1577                     term->seen_disp_event = TRUE;
1578                     break;
1579                   case '=':
1580                     compatibility(VT100);
1581                     term->app_keypad_keys = TRUE;
1582                     break;
1583                   case '>':
1584                     compatibility(VT100);
1585                     term->app_keypad_keys = FALSE;
1586                     break;
1587                   case 'D':            /* exactly equivalent to LF */
1588                     compatibility(VT100);
1589                     if (term->curs.y == term->marg_b)
1590                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1591                     else if (term->curs.y < term->rows - 1)
1592                         term->curs.y++;
1593                     fix_cpos;
1594                     term->wrapnext = FALSE;
1595                     term->seen_disp_event = TRUE;
1596                     break;
1597                   case 'E':            /* exactly equivalent to CR-LF */
1598                     compatibility(VT100);
1599                     term->curs.x = 0;
1600                     if (term->curs.y == term->marg_b)
1601                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1602                     else if (term->curs.y < term->rows - 1)
1603                         term->curs.y++;
1604                     fix_cpos;
1605                     term->wrapnext = FALSE;
1606                     term->seen_disp_event = TRUE;
1607                     break;
1608                   case 'M':            /* reverse index - backwards LF */
1609                     compatibility(VT100);
1610                     if (term->curs.y == term->marg_t)
1611                         scroll(term, term->marg_t, term->marg_b, -1, TRUE);
1612                     else if (term->curs.y > 0)
1613                         term->curs.y--;
1614                     fix_cpos;
1615                     term->wrapnext = FALSE;
1616                     term->seen_disp_event = TRUE;
1617                     break;
1618                   case 'Z':            /* terminal type query */
1619                     compatibility(VT100);
1620                     ldisc_send(term->id_string, strlen(term->id_string), 0);
1621                     break;
1622                   case 'c':            /* restore power-on settings */
1623                     compatibility(VT100);
1624                     power_on(term);
1625                     ldisc_send(NULL, 0, 0);/* cause ldisc to notice changes */
1626                     if (term->reset_132) {
1627                         if (!cfg.no_remote_resize)
1628                             request_resize(80, term->rows);
1629                         term->reset_132 = 0;
1630                     }
1631                     fix_cpos;
1632                     term->disptop = 0;
1633                     term->seen_disp_event = TRUE;
1634                     break;
1635                   case 'H':            /* set a tab */
1636                     compatibility(VT100);
1637                     term->tabs[term->curs.x] = TRUE;
1638                     break;
1639
1640                   case ANSI('8', '#'):  /* ESC # 8 fills screen with Es :-) */
1641                     compatibility(VT100);
1642                     {
1643                         unsigned long *ldata;
1644                         int i, j;
1645                         pos scrtop, scrbot;
1646
1647                         for (i = 0; i < term->rows; i++) {
1648                             ldata = lineptr(i);
1649                             for (j = 0; j < term->cols; j++)
1650                                 ldata[j] = ATTR_DEFAULT | 'E';
1651                             ldata[term->cols] = 0;
1652                         }
1653                         term->disptop = 0;
1654                         term->seen_disp_event = TRUE;
1655                         scrtop.x = scrtop.y = 0;
1656                         scrbot.x = 0;
1657                         scrbot.y = term->rows;
1658                         check_selection(term, scrtop, scrbot);
1659                     }
1660                     break;
1661
1662                   case ANSI('3', '#'):
1663                   case ANSI('4', '#'):
1664                   case ANSI('5', '#'):
1665                   case ANSI('6', '#'):
1666                     compatibility(VT100);
1667                     {
1668                         unsigned long nlattr;
1669                         unsigned long *ldata;
1670                         switch (ANSI(c, term->esc_query)) {
1671                           case ANSI('3', '#'):
1672                             nlattr = LATTR_TOP;
1673                             break;
1674                           case ANSI('4', '#'):
1675                             nlattr = LATTR_BOT;
1676                             break;
1677                           case ANSI('5', '#'):
1678                             nlattr = LATTR_NORM;
1679                             break;
1680                           default: /* spiritually case ANSI('6', '#'): */
1681                             nlattr = LATTR_WIDE;
1682                             break;
1683                         }
1684                         ldata = lineptr(term->curs.y);
1685                         ldata[term->cols] &= ~LATTR_MODE;
1686                         ldata[term->cols] |= nlattr;
1687                     }
1688                     break;
1689
1690                   case ANSI('A', '('):
1691                     compatibility(VT100);
1692                     if (!cfg.no_remote_charset)
1693                         term->cset_attr[0] = ATTR_GBCHR;
1694                     break;
1695                   case ANSI('B', '('):
1696                     compatibility(VT100);
1697                     if (!cfg.no_remote_charset)
1698                         term->cset_attr[0] = ATTR_ASCII;
1699                     break;
1700                   case ANSI('0', '('):
1701                     compatibility(VT100);
1702                     if (!cfg.no_remote_charset)
1703                         term->cset_attr[0] = ATTR_LINEDRW;
1704                     break;
1705                   case ANSI('U', '('):
1706                     compatibility(OTHER);
1707                     if (!cfg.no_remote_charset)
1708                         term->cset_attr[0] = ATTR_SCOACS;
1709                     break;
1710
1711                   case ANSI('A', ')'):
1712                     compatibility(VT100);
1713                     if (!cfg.no_remote_charset)
1714                         term->cset_attr[1] = ATTR_GBCHR;
1715                     break;
1716                   case ANSI('B', ')'):
1717                     compatibility(VT100);
1718                     if (!cfg.no_remote_charset)
1719                         term->cset_attr[1] = ATTR_ASCII;
1720                     break;
1721                   case ANSI('0', ')'):
1722                     compatibility(VT100);
1723                     if (!cfg.no_remote_charset)
1724                         term->cset_attr[1] = ATTR_LINEDRW;
1725                     break;
1726                   case ANSI('U', ')'):
1727                     compatibility(OTHER);
1728                     if (!cfg.no_remote_charset)
1729                         term->cset_attr[1] = ATTR_SCOACS;
1730                     break;
1731
1732                   case ANSI('8', '%'):  /* Old Linux code */
1733                   case ANSI('G', '%'):
1734                     compatibility(OTHER);
1735                     if (!cfg.no_remote_charset)
1736                         term->utf = 1;
1737                     break;
1738                   case ANSI('@', '%'):
1739                     compatibility(OTHER);
1740                     if (!cfg.no_remote_charset)
1741                         term->utf = 0;
1742                     break;
1743                 }
1744                 break;
1745               case SEEN_CSI:
1746                 term->termstate = TOPLEVEL;  /* default */
1747                 if (isdigit(c)) {
1748                     if (term->esc_nargs <= ARGS_MAX) {
1749                         if (term->esc_args[term->esc_nargs - 1] == ARG_DEFAULT)
1750                             term->esc_args[term->esc_nargs - 1] = 0;
1751                         term->esc_args[term->esc_nargs - 1] =
1752                             10 * term->esc_args[term->esc_nargs - 1] + c - '0';
1753                     }
1754                     term->termstate = SEEN_CSI;
1755                 } else if (c == ';') {
1756                     if (++term->esc_nargs <= ARGS_MAX)
1757                         term->esc_args[term->esc_nargs - 1] = ARG_DEFAULT;
1758                     term->termstate = SEEN_CSI;
1759                 } else if (c < '@') {
1760                     if (term->esc_query)
1761                         term->esc_query = -1;
1762                     else if (c == '?')
1763                         term->esc_query = TRUE;
1764                     else
1765                         term->esc_query = c;
1766                     term->termstate = SEEN_CSI;
1767                 } else
1768                     switch (ANSI(c, term->esc_query)) {
1769                       case 'A':       /* move up N lines */
1770                         move(term, term->curs.x,
1771                              term->curs.y - def(term->esc_args[0], 1), 1);
1772                         term->seen_disp_event = TRUE;
1773                         break;
1774                       case 'e':       /* move down N lines */
1775                         compatibility(ANSI);
1776                         /* FALLTHROUGH */
1777                       case 'B':
1778                         move(term, term->curs.x,
1779                              term->curs.y + def(term->esc_args[0], 1), 1);
1780                         term->seen_disp_event = TRUE;
1781                         break;
1782                       case ANSI('c', '>'):      /* report xterm version */
1783                         compatibility(OTHER);
1784                         /* this reports xterm version 136 so that VIM can
1785                            use the drag messages from the mouse reporting */
1786                         ldisc_send("\033[>0;136;0c", 11, 0);
1787                         break;
1788                       case 'a':       /* move right N cols */
1789                         compatibility(ANSI);
1790                         /* FALLTHROUGH */
1791                       case 'C':
1792                         move(term, term->curs.x + def(term->esc_args[0], 1),
1793                              term->curs.y, 1);
1794                         term->seen_disp_event = TRUE;
1795                         break;
1796                       case 'D':       /* move left N cols */
1797                         move(term, term->curs.x - def(term->esc_args[0], 1),
1798                              term->curs.y, 1);
1799                         term->seen_disp_event = TRUE;
1800                         break;
1801                       case 'E':       /* move down N lines and CR */
1802                         compatibility(ANSI);
1803                         move(term, 0,
1804                              term->curs.y + def(term->esc_args[0], 1), 1);
1805                         term->seen_disp_event = TRUE;
1806                         break;
1807                       case 'F':       /* move up N lines and CR */
1808                         compatibility(ANSI);
1809                         move(term, 0,
1810                              term->curs.y - def(term->esc_args[0], 1), 1);
1811                         term->seen_disp_event = TRUE;
1812                         break;
1813                       case 'G':
1814                       case '`':       /* set horizontal posn */
1815                         compatibility(ANSI);
1816                         move(term, def(term->esc_args[0], 1) - 1,
1817                              term->curs.y, 0);
1818                         term->seen_disp_event = TRUE;
1819                         break;
1820                       case 'd':       /* set vertical posn */
1821                         compatibility(ANSI);
1822                         move(term, term->curs.x,
1823                              ((term->dec_om ? term->marg_t : 0) +
1824                               def(term->esc_args[0], 1) - 1),
1825                              (term->dec_om ? 2 : 0));
1826                         term->seen_disp_event = TRUE;
1827                         break;
1828                       case 'H':
1829                       case 'f':       /* set horz and vert posns at once */
1830                         if (term->esc_nargs < 2)
1831                             term->esc_args[1] = ARG_DEFAULT;
1832                         move(term, def(term->esc_args[1], 1) - 1,
1833                              ((term->dec_om ? term->marg_t : 0) +
1834                               def(term->esc_args[0], 1) - 1),
1835                              (term->dec_om ? 2 : 0));
1836                         term->seen_disp_event = TRUE;
1837                         break;
1838                       case 'J':       /* erase screen or parts of it */
1839                         {
1840                             unsigned int i = def(term->esc_args[0], 0) + 1;
1841                             if (i > 3)
1842                                 i = 0;
1843                             erase_lots(term, FALSE, !!(i & 2), !!(i & 1));
1844                         }
1845                         term->disptop = 0;
1846                         term->seen_disp_event = TRUE;
1847                         break;
1848                       case 'K':       /* erase line or parts of it */
1849                         {
1850                             unsigned int i = def(term->esc_args[0], 0) + 1;
1851                             if (i > 3)
1852                                 i = 0;
1853                             erase_lots(term, TRUE, !!(i & 2), !!(i & 1));
1854                         }
1855                         term->seen_disp_event = TRUE;
1856                         break;
1857                       case 'L':       /* insert lines */
1858                         compatibility(VT102);
1859                         if (term->curs.y <= term->marg_b)
1860                             scroll(term, term->curs.y, term->marg_b,
1861                                    -def(term->esc_args[0], 1), FALSE);
1862                         fix_cpos;
1863                         term->seen_disp_event = TRUE;
1864                         break;
1865                       case 'M':       /* delete lines */
1866                         compatibility(VT102);
1867                         if (term->curs.y <= term->marg_b)
1868                             scroll(term, term->curs.y, term->marg_b,
1869                                    def(term->esc_args[0], 1),
1870                                    TRUE);
1871                         fix_cpos;
1872                         term->seen_disp_event = TRUE;
1873                         break;
1874                       case '@':       /* insert chars */
1875                         /* XXX VTTEST says this is vt220, vt510 manual says vt102 */
1876                         compatibility(VT102);
1877                         insch(term, def(term->esc_args[0], 1));
1878                         term->seen_disp_event = TRUE;
1879                         break;
1880                       case 'P':       /* delete chars */
1881                         compatibility(VT102);
1882                         insch(term, -def(term->esc_args[0], 1));
1883                         term->seen_disp_event = TRUE;
1884                         break;
1885                       case 'c':       /* terminal type query */
1886                         compatibility(VT100);
1887                         /* This is the response for a VT102 */
1888                         ldisc_send(term->id_string,
1889                                    strlen(term->id_string), 0);
1890                         break;
1891                       case 'n':       /* cursor position query */
1892                         if (term->esc_args[0] == 6) {
1893                             char buf[32];
1894                             sprintf(buf, "\033[%d;%dR", term->curs.y + 1,
1895                                     term->curs.x + 1);
1896                             ldisc_send(buf, strlen(buf), 0);
1897                         } else if (term->esc_args[0] == 5) {
1898                             ldisc_send("\033[0n", 4, 0);
1899                         }
1900                         break;
1901                       case 'h':       /* toggle modes to high */
1902                       case ANSI_QUE('h'):
1903                         compatibility(VT100);
1904                         {
1905                             int i;
1906                             for (i = 0; i < term->esc_nargs; i++)
1907                                 toggle_mode(term, term->esc_args[i],
1908                                             term->esc_query, TRUE);
1909                         }
1910                         break;
1911                       case 'i':
1912                       case ANSI_QUE('i'):
1913                         compatibility(VT100);
1914                         {
1915                             if (term->esc_nargs != 1) break;
1916                             if (term->esc_args[0] == 5 && *cfg.printer) {
1917                                 term->printing = TRUE;
1918                                 term->only_printing = !term->esc_query;
1919                                 term->print_state = 0;
1920                                 term_print_setup(term);
1921                             } else if (term->esc_args[0] == 4 &&
1922                                        term->printing) {
1923                                 term_print_finish(term);
1924                             }
1925                         }
1926                         break;
1927                       case 'l':       /* toggle modes to low */
1928                       case ANSI_QUE('l'):
1929                         compatibility(VT100);
1930                         {
1931                             int i;
1932                             for (i = 0; i < term->esc_nargs; i++)
1933                                 toggle_mode(term, term->esc_args[i],
1934                                             term->esc_query, FALSE);
1935                         }
1936                         break;
1937                       case 'g':       /* clear tabs */
1938                         compatibility(VT100);
1939                         if (term->esc_nargs == 1) {
1940                             if (term->esc_args[0] == 0) {
1941                                 term->tabs[term->curs.x] = FALSE;
1942                             } else if (term->esc_args[0] == 3) {
1943                                 int i;
1944                                 for (i = 0; i < term->cols; i++)
1945                                     term->tabs[i] = FALSE;
1946                             }
1947                         }
1948                         break;
1949                       case 'r':       /* set scroll margins */
1950                         compatibility(VT100);
1951                         if (term->esc_nargs <= 2) {
1952                             int top, bot;
1953                             top = def(term->esc_args[0], 1) - 1;
1954                             bot = (term->esc_nargs <= 1
1955                                    || term->esc_args[1] == 0 ?
1956                                    term->rows :
1957                                    def(term->esc_args[1], term->rows)) - 1;
1958                             if (bot >= term->rows)
1959                                 bot = term->rows - 1;
1960                             /* VTTEST Bug 9 - if region is less than 2 lines
1961                              * don't change region.
1962                              */
1963                             if (bot - top > 0) {
1964                                 term->marg_t = top;
1965                                 term->marg_b = bot;
1966                                 term->curs.x = 0;
1967                                 /*
1968                                  * I used to think the cursor should be
1969                                  * placed at the top of the newly marginned
1970                                  * area. Apparently not: VMS TPU falls over
1971                                  * if so.
1972                                  *
1973                                  * Well actually it should for
1974                                  * Origin mode - RDB
1975                                  */
1976                                 term->curs.y = (term->dec_om ?
1977                                                 term->marg_t : 0);
1978                                 fix_cpos;
1979                                 term->seen_disp_event = TRUE;
1980                             }
1981                         }
1982                         break;
1983                       case 'm':       /* set graphics rendition */
1984                         {
1985                             /*
1986                              * A VT100 without the AVO only had one
1987                              * attribute, either underline or
1988                              * reverse video depending on the
1989                              * cursor type, this was selected by
1990                              * CSI 7m.
1991                              *
1992                              * case 2:
1993                              *  This is sometimes DIM, eg on the
1994                              *  GIGI and Linux
1995                              * case 8:
1996                              *  This is sometimes INVIS various ANSI.
1997                              * case 21:
1998                              *  This like 22 disables BOLD, DIM and INVIS
1999                              *
2000                              * The ANSI colours appear on any
2001                              * terminal that has colour (obviously)
2002                              * but the interaction between sgr0 and
2003                              * the colours varies but is usually
2004                              * related to the background colour
2005                              * erase item. The interaction between
2006                              * colour attributes and the mono ones
2007                              * is also very implementation
2008                              * dependent.
2009                              *
2010                              * The 39 and 49 attributes are likely
2011                              * to be unimplemented.
2012                              */
2013                             int i;
2014                             for (i = 0; i < term->esc_nargs; i++) {
2015                                 switch (def(term->esc_args[i], 0)) {
2016                                   case 0:       /* restore defaults */
2017                                     term->curr_attr = ATTR_DEFAULT;
2018                                     break;
2019                                   case 1:       /* enable bold */
2020                                     compatibility(VT100AVO);
2021                                     term->curr_attr |= ATTR_BOLD;
2022                                     break;
2023                                   case 21:      /* (enable double underline) */
2024                                     compatibility(OTHER);
2025                                   case 4:       /* enable underline */
2026                                     compatibility(VT100AVO);
2027                                     term->curr_attr |= ATTR_UNDER;
2028                                     break;
2029                                   case 5:       /* enable blink */
2030                                     compatibility(VT100AVO);
2031                                     term->curr_attr |= ATTR_BLINK;
2032                                     break;
2033                                   case 7:       /* enable reverse video */
2034                                     term->curr_attr |= ATTR_REVERSE;
2035                                     break;
2036                                   case 10:      /* SCO acs off */
2037                                     compatibility(SCOANSI);
2038                                     if (cfg.no_remote_charset) break;
2039                                     term->sco_acs = 0; break;
2040                                   case 11:      /* SCO acs on */
2041                                     compatibility(SCOANSI);
2042                                     if (cfg.no_remote_charset) break;
2043                                     term->sco_acs = 1; break;
2044                                   case 12:      /* SCO acs on flipped */
2045                                     compatibility(SCOANSI);
2046                                     if (cfg.no_remote_charset) break;
2047                                     term->sco_acs = 2; break;
2048                                   case 22:      /* disable bold */
2049                                     compatibility2(OTHER, VT220);
2050                                     term->curr_attr &= ~ATTR_BOLD;
2051                                     break;
2052                                   case 24:      /* disable underline */
2053                                     compatibility2(OTHER, VT220);
2054                                     term->curr_attr &= ~ATTR_UNDER;
2055                                     break;
2056                                   case 25:      /* disable blink */
2057                                     compatibility2(OTHER, VT220);
2058                                     term->curr_attr &= ~ATTR_BLINK;
2059                                     break;
2060                                   case 27:      /* disable reverse video */
2061                                     compatibility2(OTHER, VT220);
2062                                     term->curr_attr &= ~ATTR_REVERSE;
2063                                     break;
2064                                   case 30:
2065                                   case 31:
2066                                   case 32:
2067                                   case 33:
2068                                   case 34:
2069                                   case 35:
2070                                   case 36:
2071                                   case 37:
2072                                     /* foreground */
2073                                     term->curr_attr &= ~ATTR_FGMASK;
2074                                     term->curr_attr |=
2075                                         (term->esc_args[i] - 30)<<ATTR_FGSHIFT;
2076                                     break;
2077                                   case 39:      /* default-foreground */
2078                                     term->curr_attr &= ~ATTR_FGMASK;
2079                                     term->curr_attr |= ATTR_DEFFG;
2080                                     break;
2081                                   case 40:
2082                                   case 41:
2083                                   case 42:
2084                                   case 43:
2085                                   case 44:
2086                                   case 45:
2087                                   case 46:
2088                                   case 47:
2089                                     /* background */
2090                                     term->curr_attr &= ~ATTR_BGMASK;
2091                                     term->curr_attr |=
2092                                         (term->esc_args[i] - 40)<<ATTR_BGSHIFT;
2093                                     break;
2094                                   case 49:      /* default-background */
2095                                     term->curr_attr &= ~ATTR_BGMASK;
2096                                     term->curr_attr |= ATTR_DEFBG;
2097                                     break;
2098                                 }
2099                             }
2100                             if (term->use_bce)
2101                                 term->erase_char = (' ' | ATTR_ASCII |
2102                                                     (term->curr_attr &
2103                                                      (ATTR_FGMASK |
2104                                                       ATTR_BGMASK)));
2105                         }
2106                         break;
2107                       case 's':       /* save cursor */
2108                         save_cursor(term, TRUE);
2109                         break;
2110                       case 'u':       /* restore cursor */
2111                         save_cursor(term, FALSE);
2112                         term->seen_disp_event = TRUE;
2113                         break;
2114                       case 't':       /* set page size - ie window height */
2115                         /*
2116                          * VT340/VT420 sequence DECSLPP, DEC only allows values
2117                          *  24/25/36/48/72/144 other emulators (eg dtterm) use
2118                          * illegal values (eg first arg 1..9) for window changing
2119                          * and reports.
2120                          */
2121                         if (term->esc_nargs <= 1
2122                             && (term->esc_args[0] < 1 ||
2123                                 term->esc_args[0] >= 24)) {
2124                             compatibility(VT340TEXT);
2125                             if (!cfg.no_remote_resize)
2126                                 request_resize(term->cols,
2127                                                def(term->esc_args[0], 24));
2128                             deselect(term);
2129                         } else if (term->esc_nargs >= 1 &&
2130                                    term->esc_args[0] >= 1 &&
2131                                    term->esc_args[0] < 24) {
2132                             compatibility(OTHER);
2133
2134                             switch (term->esc_args[0]) {
2135                                 int x, y, len;
2136                                 char buf[80], *p;
2137                               case 1:
2138                                 set_iconic(FALSE);
2139                                 break;
2140                               case 2:
2141                                 set_iconic(TRUE);
2142                                 break;
2143                               case 3:
2144                                 if (term->esc_nargs >= 3) {
2145                                     if (!cfg.no_remote_resize)
2146                                         move_window(def(term->esc_args[1], 0),
2147                                                     def(term->esc_args[2], 0));
2148                                 }
2149                                 break;
2150                               case 4:
2151                                 /* We should resize the window to a given
2152                                  * size in pixels here, but currently our
2153                                  * resizing code isn't healthy enough to
2154                                  * manage it. */
2155                                 break;
2156                               case 5:
2157                                 set_zorder(TRUE);   /* move to top */
2158                                 break;
2159                               case 6:
2160                                 set_zorder(FALSE);  /* move to bottom */
2161                                 break;
2162                               case 7:
2163                                 refresh_window();
2164                                 break;
2165                               case 8:
2166                                 if (term->esc_nargs >= 3) {
2167                                     if (!cfg.no_remote_resize)
2168                                         request_resize(def(term->esc_args[2], cfg.width),
2169                                                        def(term->esc_args[1], cfg.height));
2170                                 }
2171                                 break;
2172                               case 9:
2173                                 if (term->esc_nargs >= 2)
2174                                     set_zoomed(term->esc_args[1] ?
2175                                                TRUE : FALSE);
2176                                 break;
2177                               case 11:
2178                                 ldisc_send(is_iconic() ? "\033[1t" : "\033[2t",
2179                                            4, 0);
2180                                 break;
2181                               case 13:
2182                                 get_window_pos(&x, &y);
2183                                 len = sprintf(buf, "\033[3;%d;%dt", x, y);
2184                                 ldisc_send(buf, len, 0);
2185                                 break;
2186                               case 14:
2187                                 get_window_pixels(&x, &y);
2188                                 len = sprintf(buf, "\033[4;%d;%dt", x, y);
2189                                 ldisc_send(buf, len, 0);
2190                                 break;
2191                               case 18:
2192                                 len = sprintf(buf, "\033[8;%d;%dt",
2193                                               term->rows, term->cols);
2194                                 ldisc_send(buf, len, 0);
2195                                 break;
2196                               case 19:
2197                                 /*
2198                                  * Hmmm. Strictly speaking we
2199                                  * should return `the size of the
2200                                  * screen in characters', but
2201                                  * that's not easy: (a) window
2202                                  * furniture being what it is it's
2203                                  * hard to compute, and (b) in
2204                                  * resize-font mode maximising the
2205                                  * window wouldn't change the
2206                                  * number of characters. *shrug*. I
2207                                  * think we'll ignore it for the
2208                                  * moment and see if anyone
2209                                  * complains, and then ask them
2210                                  * what they would like it to do.
2211                                  */
2212                                 break;
2213                               case 20:
2214                                 p = get_window_title(TRUE);
2215                                 len = strlen(p);
2216                                 ldisc_send("\033]L", 3, 0);
2217                                 ldisc_send(p, len, 0);
2218                                 ldisc_send("\033\\", 2, 0);
2219                                 break;
2220                               case 21:
2221                                 p = get_window_title(FALSE);
2222                                 len = strlen(p);
2223                                 ldisc_send("\033]l", 3, 0);
2224                                 ldisc_send(p, len, 0);
2225                                 ldisc_send("\033\\", 2, 0);
2226                                 break;
2227                             }
2228                         }
2229                         break;
2230                       case 'S':
2231                         compatibility(SCOANSI);
2232                         scroll(term, term->marg_t, term->marg_b,
2233                                def(term->esc_args[0], 1), TRUE);
2234                         fix_cpos;
2235                         term->wrapnext = FALSE;
2236                         term->seen_disp_event = TRUE;
2237                         break;
2238                       case 'T':
2239                         compatibility(SCOANSI);
2240                         scroll(term, term->marg_t, term->marg_b,
2241                                -def(term->esc_args[0], 1), TRUE);
2242                         fix_cpos;
2243                         term->wrapnext = FALSE;
2244                         term->seen_disp_event = TRUE;
2245                         break;
2246                       case ANSI('|', '*'):
2247                         /* VT420 sequence DECSNLS
2248                          * Set number of lines on screen
2249                          * VT420 uses VGA like hardware and can support any size in
2250                          * reasonable range (24..49 AIUI) with no default specified.
2251                          */
2252                         compatibility(VT420);
2253                         if (term->esc_nargs == 1 && term->esc_args[0] > 0) {
2254                             if (!cfg.no_remote_resize)
2255                                 request_resize(term->cols,
2256                                                def(term->esc_args[0],
2257                                                    cfg.height));
2258                             deselect(term);
2259                         }
2260                         break;
2261                       case ANSI('|', '$'):
2262                         /* VT340/VT420 sequence DECSCPP
2263                          * Set number of columns per page
2264                          * Docs imply range is only 80 or 132, but I'll allow any.
2265                          */
2266                         compatibility(VT340TEXT);
2267                         if (term->esc_nargs <= 1) {
2268                             if (!cfg.no_remote_resize)
2269                                 request_resize(def(term->esc_args[0],
2270                                                    cfg.width), term->rows);
2271                             deselect(term);
2272                         }
2273                         break;
2274                       case 'X':       /* write N spaces w/o moving cursor */
2275                         /* XXX VTTEST says this is vt220, vt510 manual says vt100 */
2276                         compatibility(ANSIMIN);
2277                         {
2278                             int n = def(term->esc_args[0], 1);
2279                             pos cursplus;
2280                             unsigned long *p = term->cpos;
2281                             if (n > term->cols - term->curs.x)
2282                                 n = term->cols - term->curs.x;
2283                             cursplus = term->curs;
2284                             cursplus.x += n;
2285                             check_selection(term, term->curs, cursplus);
2286                             while (n--)
2287                                 *p++ = term->erase_char;
2288                             term->seen_disp_event = TRUE;
2289                         }
2290                         break;
2291                       case 'x':       /* report terminal characteristics */
2292                         compatibility(VT100);
2293                         {
2294                             char buf[32];
2295                             int i = def(term->esc_args[0], 0);
2296                             if (i == 0 || i == 1) {
2297                                 strcpy(buf, "\033[2;1;1;112;112;1;0x");
2298                                 buf[2] += i;
2299                                 ldisc_send(buf, 20, 0);
2300                             }
2301                         }
2302                         break;
2303                       case 'Z':         /* BackTab for xterm */
2304                         compatibility(OTHER);
2305                         {
2306                             int i = def(term->esc_args[0], 1);
2307                             pos old_curs = term->curs;
2308
2309                             for(;i>0 && term->curs.x>0; i--) {
2310                                 do {
2311                                     term->curs.x--;
2312                                 } while (term->curs.x >0 &&
2313                                          !term->tabs[term->curs.x]);
2314                             }
2315                             fix_cpos;
2316                             check_selection(term, old_curs, term->curs);
2317                         }
2318                         break;
2319                       case ANSI('L', '='):
2320                         compatibility(OTHER);
2321                         term->use_bce = (term->esc_args[0] <= 0);
2322                         term->erase_char = ERASE_CHAR;
2323                         if (term->use_bce)
2324                             term->erase_char = (' ' | ATTR_ASCII |
2325                                                 (term->curr_attr &
2326                                                  (ATTR_FGMASK | ATTR_BGMASK)));
2327                         break;
2328                       case ANSI('E', '='):
2329                         compatibility(OTHER);
2330                         term->blink_is_real = (term->esc_args[0] >= 1);
2331                         break;
2332                       case ANSI('p', '"'):
2333                         /*
2334                          * Allow the host to make this emulator a
2335                          * 'perfect' VT102. This first appeared in
2336                          * the VT220, but we do need to get back to
2337                          * PuTTY mode so I won't check it.
2338                          *
2339                          * The arg in 40..42,50 are a PuTTY extension.
2340                          * The 2nd arg, 8bit vs 7bit is not checked.
2341                          *
2342                          * Setting VT102 mode should also change
2343                          * the Fkeys to generate PF* codes as a
2344                          * real VT102 has no Fkeys. The VT220 does
2345                          * this, F11..F13 become ESC,BS,LF other
2346                          * Fkeys send nothing.
2347                          *
2348                          * Note ESC c will NOT change this!
2349                          */
2350
2351                         switch (term->esc_args[0]) {
2352                           case 61:
2353                             term->compatibility_level &= ~TM_VTXXX;
2354                             term->compatibility_level |= TM_VT102;
2355                             break;
2356                           case 62:
2357                             term->compatibility_level &= ~TM_VTXXX;
2358                             term->compatibility_level |= TM_VT220;
2359                             break;
2360
2361                           default:
2362                             if (term->esc_args[0] > 60 &&
2363                                 term->esc_args[0] < 70)
2364                                 term->compatibility_level |= TM_VTXXX;
2365                             break;
2366
2367                           case 40:
2368                             term->compatibility_level &= TM_VTXXX;
2369                             break;
2370                           case 41:
2371                             term->compatibility_level = TM_PUTTY;
2372                             break;
2373                           case 42:
2374                             term->compatibility_level = TM_SCOANSI;
2375                             break;
2376
2377                           case ARG_DEFAULT:
2378                             term->compatibility_level = TM_PUTTY;
2379                             break;
2380                           case 50:
2381                             break;
2382                         }
2383
2384                         /* Change the response to CSI c */
2385                         if (term->esc_args[0] == 50) {
2386                             int i;
2387                             char lbuf[64];
2388                             strcpy(term->id_string, "\033[?");
2389                             for (i = 1; i < term->esc_nargs; i++) {
2390                                 if (i != 1)
2391                                     strcat(term->id_string, ";");
2392                                 sprintf(lbuf, "%d", term->esc_args[i]);
2393                                 strcat(term->id_string, lbuf);
2394                             }
2395                             strcat(term->id_string, "c");
2396                         }
2397 #if 0
2398                         /* Is this a good idea ?
2399                          * Well we should do a soft reset at this point ...
2400                          */
2401                         if (!has_compat(VT420) && has_compat(VT100)) {
2402                             if (!cfg.no_remote_resize) {
2403                                 if (term->reset_132)
2404                                     request_resize(132, 24);
2405                                 else
2406                                     request_resize(80, 24);
2407                             }
2408                         }
2409 #endif
2410                         break;
2411                     }
2412                 break;
2413               case SEEN_OSC:
2414                 term->osc_w = FALSE;
2415                 switch (c) {
2416                   case 'P':            /* Linux palette sequence */
2417                     term->termstate = SEEN_OSC_P;
2418                     term->osc_strlen = 0;
2419                     break;
2420                   case 'R':            /* Linux palette reset */
2421                     palette_reset();
2422                     term_invalidate(term);
2423                     term->termstate = TOPLEVEL;
2424                     break;
2425                   case 'W':            /* word-set */
2426                     term->termstate = SEEN_OSC_W;
2427                     term->osc_w = TRUE;
2428                     break;
2429                   case '0':
2430                   case '1':
2431                   case '2':
2432                   case '3':
2433                   case '4':
2434                   case '5':
2435                   case '6':
2436                   case '7':
2437                   case '8':
2438                   case '9':
2439                     term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
2440                     break;
2441                   case 'L':
2442                     /*
2443                      * Grotty hack to support xterm and DECterm title
2444                      * sequences concurrently.
2445                      */
2446                     if (term->esc_args[0] == 2) {
2447                         term->esc_args[0] = 1;
2448                         break;
2449                     }
2450                     /* else fall through */
2451                   default:
2452                     term->termstate = OSC_STRING;
2453                     term->osc_strlen = 0;
2454                 }
2455                 break;
2456               case OSC_STRING:
2457                 /*
2458                  * This OSC stuff is EVIL. It takes just one character to get into
2459                  * sysline mode and it's not initially obvious how to get out.
2460                  * So I've added CR and LF as string aborts.
2461                  * This shouldn't effect compatibility as I believe embedded
2462                  * control characters are supposed to be interpreted (maybe?)
2463                  * and they don't display anything useful anyway.
2464                  *
2465                  * -- RDB
2466                  */
2467                 if (c == '\n' || c == '\r') {
2468                     term->termstate = TOPLEVEL;
2469                 } else if (c == 0234 || c == '\007') {
2470                     /*
2471                      * These characters terminate the string; ST and BEL
2472                      * terminate the sequence and trigger instant
2473                      * processing of it, whereas ESC goes back to SEEN_ESC
2474                      * mode unless it is followed by \, in which case it is
2475                      * synonymous with ST in the first place.
2476                      */
2477                     do_osc(term);
2478                     term->termstate = TOPLEVEL;
2479                 } else if (c == '\033')
2480                     term->termstate = OSC_MAYBE_ST;
2481                 else if (term->osc_strlen < OSC_STR_MAX)
2482                     term->osc_string[term->osc_strlen++] = c;
2483                 break;
2484               case SEEN_OSC_P:
2485                 {
2486                     int max = (term->osc_strlen == 0 ? 21 : 16);
2487                     int val;
2488                     if (c >= '0' && c <= '9')
2489                         val = c - '0';
2490                     else if (c >= 'A' && c <= 'A' + max - 10)
2491                         val = c - 'A' + 10;
2492                     else if (c >= 'a' && c <= 'a' + max - 10)
2493                         val = c - 'a' + 10;
2494                     else {
2495                         term->termstate = TOPLEVEL;
2496                         break;
2497                     }
2498                     term->osc_string[term->osc_strlen++] = val;
2499                     if (term->osc_strlen >= 7) {
2500                         palette_set(term->osc_string[0],
2501                                     term->osc_string[1] * 16 + term->osc_string[2],
2502                                     term->osc_string[3] * 16 + term->osc_string[4],
2503                                     term->osc_string[5] * 16 + term->osc_string[6]);
2504                         term_invalidate(term);
2505                         term->termstate = TOPLEVEL;
2506                     }
2507                 }
2508                 break;
2509               case SEEN_OSC_W:
2510                 switch (c) {
2511                   case '0':
2512                   case '1':
2513                   case '2':
2514                   case '3':
2515                   case '4':
2516                   case '5':
2517                   case '6':
2518                   case '7':
2519                   case '8':
2520                   case '9':
2521                     term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
2522                     break;
2523                   default:
2524                     term->termstate = OSC_STRING;
2525                     term->osc_strlen = 0;
2526                 }
2527                 break;
2528               case VT52_ESC:
2529                 term->termstate = TOPLEVEL;
2530                 term->seen_disp_event = TRUE;
2531                 switch (c) {
2532                   case 'A':
2533                     move(term, term->curs.x, term->curs.y - 1, 1);
2534                     break;
2535                   case 'B':
2536                     move(term, term->curs.x, term->curs.y + 1, 1);
2537                     break;
2538                   case 'C':
2539                     move(term, term->curs.x + 1, term->curs.y, 1);
2540                     break;
2541                   case 'D':
2542                     move(term, term->curs.x - 1, term->curs.y, 1);
2543                     break;
2544                     /*
2545                      * From the VT100 Manual
2546                      * NOTE: The special graphics characters in the VT100
2547                      *       are different from those in the VT52
2548                      *
2549                      * From VT102 manual:
2550                      *       137 _  Blank             - Same
2551                      *       140 `  Reserved          - Humm.
2552                      *       141 a  Solid rectangle   - Similar
2553                      *       142 b  1/                - Top half of fraction for the
2554                      *       143 c  3/                - subscript numbers below.
2555                      *       144 d  5/
2556                      *       145 e  7/
2557                      *       146 f  Degrees           - Same
2558                      *       147 g  Plus or minus     - Same
2559                      *       150 h  Right arrow
2560                      *       151 i  Ellipsis (dots)
2561                      *       152 j  Divide by
2562                      *       153 k  Down arrow
2563                      *       154 l  Bar at scan 0
2564                      *       155 m  Bar at scan 1
2565                      *       156 n  Bar at scan 2
2566                      *       157 o  Bar at scan 3     - Similar
2567                      *       160 p  Bar at scan 4     - Similar
2568                      *       161 q  Bar at scan 5     - Similar
2569                      *       162 r  Bar at scan 6     - Same
2570                      *       163 s  Bar at scan 7     - Similar
2571                      *       164 t  Subscript 0
2572                      *       165 u  Subscript 1
2573                      *       166 v  Subscript 2
2574                      *       167 w  Subscript 3
2575                      *       170 x  Subscript 4
2576                      *       171 y  Subscript 5
2577                      *       172 z  Subscript 6
2578                      *       173 {  Subscript 7
2579                      *       174 |  Subscript 8
2580                      *       175 }  Subscript 9
2581                      *       176 ~  Paragraph
2582                      *
2583                      */
2584                   case 'F':
2585                     term->cset_attr[term->cset = 0] = ATTR_LINEDRW;
2586                     break;
2587                   case 'G':
2588                     term->cset_attr[term->cset = 0] = ATTR_ASCII;
2589                     break;
2590                   case 'H':
2591                     move(term, 0, 0, 0);
2592                     break;
2593                   case 'I':
2594                     if (term->curs.y == 0)
2595                         scroll(term, 0, term->rows - 1, -1, TRUE);
2596                     else if (term->curs.y > 0)
2597                         term->curs.y--;
2598                     fix_cpos;
2599                     term->wrapnext = FALSE;
2600                     break;
2601                   case 'J':
2602                     erase_lots(term, FALSE, FALSE, TRUE);
2603                     term->disptop = 0;
2604                     break;
2605                   case 'K':
2606                     erase_lots(term, TRUE, FALSE, TRUE);
2607                     break;
2608 #if 0
2609                   case 'V':
2610                     /* XXX Print cursor line */
2611                     break;
2612                   case 'W':
2613                     /* XXX Start controller mode */
2614                     break;
2615                   case 'X':
2616                     /* XXX Stop controller mode */
2617                     break;
2618 #endif
2619                   case 'Y':
2620                     term->termstate = VT52_Y1;
2621                     break;
2622                   case 'Z':
2623                     ldisc_send("\033/Z", 3, 0);
2624                     break;
2625                   case '=':
2626                     term->app_keypad_keys = TRUE;
2627                     break;
2628                   case '>':
2629                     term->app_keypad_keys = FALSE;
2630                     break;
2631                   case '<':
2632                     /* XXX This should switch to VT100 mode not current or default
2633                      *     VT mode. But this will only have effect in a VT220+
2634                      *     emulation.
2635                      */
2636                     term->vt52_mode = FALSE;
2637                     term->blink_is_real = cfg.blinktext;
2638                     break;
2639 #if 0
2640                   case '^':
2641                     /* XXX Enter auto print mode */
2642                     break;
2643                   case '_':
2644                     /* XXX Exit auto print mode */
2645                     break;
2646                   case ']':
2647                     /* XXX Print screen */
2648                     break;
2649 #endif
2650
2651 #ifdef VT52_PLUS
2652                   case 'E':
2653                     /* compatibility(ATARI) */
2654                     move(term, 0, 0, 0);
2655                     erase_lots(term, FALSE, FALSE, TRUE);
2656                     term->disptop = 0;
2657                     break;
2658                   case 'L':
2659                     /* compatibility(ATARI) */
2660                     if (term->curs.y <= term->marg_b)
2661                         scroll(term, term->curs.y, term->marg_b, -1, FALSE);
2662                     break;
2663                   case 'M':
2664                     /* compatibility(ATARI) */
2665                     if (term->curs.y <= term->marg_b)
2666                         scroll(term, term->curs.y, term->marg_b, 1, TRUE);
2667                     break;
2668                   case 'b':
2669                     /* compatibility(ATARI) */
2670                     term->termstate = VT52_FG;
2671                     break;
2672                   case 'c':
2673                     /* compatibility(ATARI) */
2674                     term->termstate = VT52_BG;
2675                     break;
2676                   case 'd':
2677                     /* compatibility(ATARI) */
2678                     erase_lots(term, FALSE, TRUE, FALSE);
2679                     term->disptop = 0;
2680                     break;
2681                   case 'e':
2682                     /* compatibility(ATARI) */
2683                     term->cursor_on = TRUE;
2684                     break;
2685                   case 'f':
2686                     /* compatibility(ATARI) */
2687                     term->cursor_on = FALSE;
2688                     break;
2689                     /* case 'j': Save cursor position - broken on ST */
2690                     /* case 'k': Restore cursor position */
2691                   case 'l':
2692                     /* compatibility(ATARI) */
2693                     erase_lots(term, TRUE, TRUE, TRUE);
2694                     term->curs.x = 0;
2695                     term->wrapnext = FALSE;
2696                     fix_cpos;
2697                     break;
2698                   case 'o':
2699                     /* compatibility(ATARI) */
2700                     erase_lots(term, TRUE, TRUE, FALSE);
2701                     break;
2702                   case 'p':
2703                     /* compatibility(ATARI) */
2704                     term->curr_attr |= ATTR_REVERSE;
2705                     break;
2706                   case 'q':
2707                     /* compatibility(ATARI) */
2708                     term->curr_attr &= ~ATTR_REVERSE;
2709                     break;
2710                   case 'v':            /* wrap Autowrap on - Wyse style */
2711                     /* compatibility(ATARI) */
2712                     term->wrap = 1;
2713                     break;
2714                   case 'w':            /* Autowrap off */
2715                     /* compatibility(ATARI) */
2716                     term->wrap = 0;
2717                     break;
2718
2719                   case 'R':
2720                     /* compatibility(OTHER) */
2721                     term->vt52_bold = FALSE;
2722                     term->curr_attr = ATTR_DEFAULT;
2723                     if (term->use_bce)
2724                         term->erase_char = (' ' | ATTR_ASCII |
2725                                             (term->curr_attr &
2726                                              (ATTR_FGMASK | ATTR_BGMASK)));
2727                     break;
2728                   case 'S':
2729                     /* compatibility(VI50) */
2730                     term->curr_attr |= ATTR_UNDER;
2731                     break;
2732                   case 'W':
2733                     /* compatibility(VI50) */
2734                     term->curr_attr &= ~ATTR_UNDER;
2735                     break;
2736                   case 'U':
2737                     /* compatibility(VI50) */
2738                     term->vt52_bold = TRUE;
2739                     term->curr_attr |= ATTR_BOLD;
2740                     break;
2741                   case 'T':
2742                     /* compatibility(VI50) */
2743                     term->vt52_bold = FALSE;
2744                     term->curr_attr &= ~ATTR_BOLD;
2745                     break;
2746 #endif
2747                 }
2748                 break;
2749               case VT52_Y1:
2750                 term->termstate = VT52_Y2;
2751                 move(term, term->curs.x, c - ' ', 0);
2752                 break;
2753               case VT52_Y2:
2754                 term->termstate = TOPLEVEL;
2755                 move(term, c - ' ', term->curs.y, 0);
2756                 break;
2757
2758 #ifdef VT52_PLUS
2759               case VT52_FG:
2760                 term->termstate = TOPLEVEL;
2761                 term->curr_attr &= ~ATTR_FGMASK;
2762                 term->curr_attr &= ~ATTR_BOLD;
2763                 term->curr_attr |= (c & 0x7) << ATTR_FGSHIFT;
2764                 if ((c & 0x8) || term->vt52_bold)
2765                     term->curr_attr |= ATTR_BOLD;
2766
2767                 if (term->use_bce)
2768                     term->erase_char = (' ' | ATTR_ASCII |
2769                                         (term->curr_attr &
2770                                          (ATTR_FGMASK | ATTR_BGMASK)));
2771                 break;
2772               case VT52_BG:
2773                 term->termstate = TOPLEVEL;
2774                 term->curr_attr &= ~ATTR_BGMASK;
2775                 term->curr_attr &= ~ATTR_BLINK;
2776                 term->curr_attr |= (c & 0x7) << ATTR_BGSHIFT;
2777
2778                 /* Note: bold background */
2779                 if (c & 0x8)
2780                     term->curr_attr |= ATTR_BLINK;
2781
2782                 if (term->use_bce)
2783                     term->erase_char = (' ' | ATTR_ASCII |
2784                                         (term->curr_attr &
2785                                          (ATTR_FGMASK | ATTR_BGMASK)));
2786                 break;
2787 #endif
2788               default: break;          /* placate gcc warning about enum use */
2789             }
2790         if (term->selstate != NO_SELECTION) {
2791             pos cursplus = term->curs;
2792             incpos(cursplus);
2793             check_selection(term, term->curs, cursplus);
2794         }
2795     }
2796
2797     term_print_flush(term);
2798 }
2799
2800 #if 0
2801 /*
2802  * Compare two lines to determine whether they are sufficiently
2803  * alike to scroll-optimise one to the other. Return the degree of
2804  * similarity.
2805  */
2806 static int linecmp(Terminal *term, unsigned long *a, unsigned long *b)
2807 {
2808     int i, n;
2809
2810     for (i = n = 0; i < term->cols; i++)
2811         n += (*a++ == *b++);
2812     return n;
2813 }
2814 #endif
2815
2816 /*
2817  * Given a context, update the window. Out of paranoia, we don't
2818  * allow WM_PAINT responses to do scrolling optimisations.
2819  */
2820 static void do_paint(Terminal *term, Context ctx, int may_optimise)
2821 {
2822     int i, j, our_curs_y;
2823     unsigned long rv, cursor;
2824     pos scrpos;
2825     char ch[1024];
2826     long cursor_background = ERASE_CHAR;
2827     unsigned long ticks;
2828
2829     /*
2830      * Check the visual bell state.
2831      */
2832     if (term->in_vbell) {
2833         ticks = GETTICKCOUNT();
2834         if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
2835             term->in_vbell = FALSE;
2836    }
2837
2838     rv = (!term->rvideo ^ !term->in_vbell ? ATTR_REVERSE : 0);
2839
2840     /* Depends on:
2841      * screen array, disptop, scrtop,
2842      * selection, rv,
2843      * cfg.blinkpc, blink_is_real, tblinker,
2844      * curs.y, curs.x, blinker, cfg.blink_cur, cursor_on, has_focus, wrapnext
2845      */
2846
2847     /* Has the cursor position or type changed ? */
2848     if (term->cursor_on) {
2849         if (term->has_focus) {
2850             if (term->blinker || !cfg.blink_cur)
2851                 cursor = TATTR_ACTCURS;
2852             else
2853                 cursor = 0;
2854         } else
2855             cursor = TATTR_PASCURS;
2856         if (term->wrapnext)
2857             cursor |= TATTR_RIGHTCURS;
2858     } else
2859         cursor = 0;
2860     our_curs_y = term->curs.y - term->disptop;
2861
2862     if (term->dispcurs && (term->curstype != cursor ||
2863                            term->dispcurs !=
2864                            term->disptext + our_curs_y * (term->cols + 1) +
2865                            term->curs.x)) {
2866         if (term->dispcurs > term->disptext &&
2867                 (*term->dispcurs & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
2868             term->dispcurs[-1] |= ATTR_INVALID;
2869         if ( (term->dispcurs[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
2870             term->dispcurs[1] |= ATTR_INVALID;
2871         *term->dispcurs |= ATTR_INVALID;
2872         term->curstype = 0;
2873     }
2874     term->dispcurs = NULL;
2875
2876     /* The normal screen data */
2877     for (i = 0; i < term->rows; i++) {
2878         unsigned long *ldata;
2879         int lattr;
2880         int idx, dirty_line, dirty_run, selected;
2881         unsigned long attr = 0;
2882         int updated_line = 0;
2883         int start = 0;
2884         int ccount = 0;
2885         int last_run_dirty = 0;
2886
2887         scrpos.y = i + term->disptop;
2888         ldata = lineptr(scrpos.y);
2889         lattr = (ldata[term->cols] & LATTR_MODE);
2890
2891         idx = i * (term->cols + 1);
2892         dirty_run = dirty_line = (ldata[term->cols] !=
2893                                   term->disptext[idx + term->cols]);
2894         term->disptext[idx + term->cols] = ldata[term->cols];
2895
2896         for (j = 0; j < term->cols; j++, idx++) {
2897             unsigned long tattr, tchar;
2898             unsigned long *d = ldata + j;
2899             int break_run;
2900             scrpos.x = j;
2901
2902             tchar = (*d & (CHAR_MASK | CSET_MASK));
2903             tattr = (*d & (ATTR_MASK ^ CSET_MASK));
2904             switch (tchar & CSET_MASK) {
2905               case ATTR_ASCII:
2906                 tchar = unitab_line[tchar & 0xFF];
2907                 break;
2908               case ATTR_LINEDRW:
2909                 tchar = unitab_xterm[tchar & 0xFF];
2910                 break;
2911               case ATTR_SCOACS:
2912                 tchar = unitab_scoacs[tchar&0xFF];
2913                 break;
2914             }
2915             tattr |= (tchar & CSET_MASK);
2916             tchar &= CHAR_MASK;
2917             if ((d[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
2918                     tattr |= ATTR_WIDE;
2919
2920             /* Video reversing things */
2921             if (term->selstate == DRAGGING || term->selstate == SELECTED) {
2922                 if (term->seltype == LEXICOGRAPHIC)
2923                     selected = (posle(term->selstart, scrpos) &&
2924                                 poslt(scrpos, term->selend));
2925                 else
2926                     selected = (posPle(term->selstart, scrpos) &&
2927                                 posPlt(scrpos, term->selend));
2928             } else
2929                 selected = FALSE;
2930             tattr = (tattr ^ rv
2931                      ^ (selected ? ATTR_REVERSE : 0));
2932
2933             /* 'Real' blinking ? */
2934             if (term->blink_is_real && (tattr & ATTR_BLINK)) {
2935                 if (term->has_focus && term->tblinker) {
2936                     tchar = ' ';
2937                     tattr &= ~CSET_MASK;
2938                     tattr |= ATTR_ACP;
2939                 }
2940                 tattr &= ~ATTR_BLINK;
2941             }
2942
2943             /*
2944              * Check the font we'll _probably_ be using to see if
2945              * the character is wide when we don't want it to be.
2946              */
2947             if ((tchar | tattr) != (term->disptext[idx]& ~ATTR_NARROW)) {
2948                 if ((tattr & ATTR_WIDE) == 0 &&
2949                     CharWidth(ctx, (tchar | tattr) & 0xFFFF) == 2)
2950                     tattr |= ATTR_NARROW;
2951             } else if (term->disptext[idx]&ATTR_NARROW)
2952                 tattr |= ATTR_NARROW;
2953
2954             /* Cursor here ? Save the 'background' */
2955             if (i == our_curs_y && j == term->curs.x) {
2956                 cursor_background = tattr | tchar;
2957                 term->dispcurs = term->disptext + idx;
2958             }
2959
2960             if ((term->disptext[idx] ^ tattr) & ATTR_WIDE)
2961                 dirty_line = TRUE;
2962
2963             break_run = (tattr != attr || j - start >= sizeof(ch));
2964
2965             /* Special hack for VT100 Linedraw glyphs */
2966             if ((attr & CSET_MASK) == 0x2300 && tchar >= 0xBA
2967                 && tchar <= 0xBD) break_run = TRUE;
2968
2969             if (!dbcs_screenfont && !dirty_line) {
2970                 if ((tchar | tattr) == term->disptext[idx])
2971                     break_run = TRUE;
2972                 else if (!dirty_run && ccount == 1)
2973                     break_run = TRUE;
2974             }
2975
2976             if (break_run) {
2977                 if ((dirty_run || last_run_dirty) && ccount > 0) {
2978                     do_text(ctx, start, i, ch, ccount, attr, lattr);
2979                     updated_line = 1;
2980                 }
2981                 start = j;
2982                 ccount = 0;
2983                 attr = tattr;
2984                 if (dbcs_screenfont)
2985                     last_run_dirty = dirty_run;
2986                 dirty_run = dirty_line;
2987             }
2988
2989             if ((tchar | tattr) != term->disptext[idx])
2990                 dirty_run = TRUE;
2991             ch[ccount++] = (char) tchar;
2992             term->disptext[idx] = tchar | tattr;
2993
2994             /* If it's a wide char step along to the next one. */
2995             if (tattr & ATTR_WIDE) {
2996                 if (++j < term->cols) {
2997                     idx++;
2998                     d++;
2999                     /* Cursor is here ? Ouch! */
3000                     if (i == our_curs_y && j == term->curs.x) {
3001                         cursor_background = *d;
3002                         term->dispcurs = term->disptext + idx;
3003                     }
3004                     if (term->disptext[idx] != *d)
3005                         dirty_run = TRUE;
3006                     term->disptext[idx] = *d;
3007                 }
3008             }
3009         }
3010         if (dirty_run && ccount > 0) {
3011             do_text(ctx, start, i, ch, ccount, attr, lattr);
3012             updated_line = 1;
3013         }
3014
3015         /* Cursor on this line ? (and changed) */
3016         if (i == our_curs_y && (term->curstype != cursor || updated_line)) {
3017             ch[0] = (char) (cursor_background & CHAR_MASK);
3018             attr = (cursor_background & ATTR_MASK) | cursor;
3019             do_cursor(ctx, term->curs.x, i, ch, 1, attr, lattr);
3020             term->curstype = cursor;
3021         }
3022     }
3023 }
3024
3025 /*
3026  * Flick the switch that says if blinking things should be shown or hidden.
3027  */
3028
3029 void term_blink(Terminal *term, int flg)
3030 {
3031     long now, blink_diff;
3032
3033     now = GETTICKCOUNT();
3034     blink_diff = now - term->last_tblink;
3035
3036     /* Make sure the text blinks no more than 2Hz; we'll use 0.45 s period. */
3037     if (blink_diff < 0 || blink_diff > (TICKSPERSEC * 9 / 20)) {
3038         term->last_tblink = now;
3039         term->tblinker = !term->tblinker;
3040     }
3041
3042     if (flg) {
3043         term->blinker = 1;
3044         term->last_blink = now;
3045         return;
3046     }
3047
3048     blink_diff = now - term->last_blink;
3049
3050     /* Make sure the cursor blinks no faster than system blink rate */
3051     if (blink_diff >= 0 && blink_diff < (long) CURSORBLINK)
3052         return;
3053
3054     term->last_blink = now;
3055     term->blinker = !term->blinker;
3056 }
3057
3058 /*
3059  * Invalidate the whole screen so it will be repainted in full.
3060  */
3061 void term_invalidate(Terminal *term)
3062 {
3063     int i;
3064
3065     for (i = 0; i < term->rows * (term->cols + 1); i++)
3066         term->disptext[i] = ATTR_INVALID;
3067 }
3068
3069 /*
3070  * Paint the window in response to a WM_PAINT message.
3071  */
3072 void term_paint(Terminal *term, Context ctx,
3073                 int left, int top, int right, int bottom)
3074 {
3075     int i, j;
3076     if (left < 0) left = 0;
3077     if (top < 0) top = 0;
3078     if (right >= term->cols) right = term->cols-1;
3079     if (bottom >= term->rows) bottom = term->rows-1;
3080
3081     for (i = top; i <= bottom && i < term->rows; i++) {
3082         if ((term->disptext[i * (term->cols + 1) + term->cols] &
3083              LATTR_MODE) == LATTR_NORM)
3084             for (j = left; j <= right && j < term->cols; j++)
3085                 term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
3086         else
3087             for (j = left / 2; j <= right / 2 + 1 && j < term->cols; j++)
3088                 term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
3089     }
3090
3091     /* This should happen soon enough, also for some reason it sometimes
3092      * fails to actually do anything when re-sizing ... painting the wrong
3093      * window perhaps ?
3094      */
3095     if (alt_pressed)
3096         do_paint (term, ctx, FALSE);
3097 }
3098
3099 /*
3100  * Attempt to scroll the scrollback. The second parameter gives the
3101  * position we want to scroll to; the first is +1 to denote that
3102  * this position is relative to the beginning of the scrollback, -1
3103  * to denote it is relative to the end, and 0 to denote that it is
3104  * relative to the current position.
3105  */
3106 void term_scroll(Terminal *term, int rel, int where)
3107 {
3108     int sbtop = -count234(term->scrollback);
3109
3110     term->disptop = (rel < 0 ? 0 : rel > 0 ? sbtop : term->disptop) + where;
3111     if (term->disptop < sbtop)
3112         term->disptop = sbtop;
3113     if (term->disptop > 0)
3114         term->disptop = 0;
3115     update_sbar(term);
3116     term_update(term);
3117 }
3118
3119 static void clipme(Terminal *term, pos top, pos bottom, int rect)
3120 {
3121     wchar_t *workbuf;
3122     wchar_t *wbptr;                    /* where next char goes within workbuf */
3123     int old_top_x;
3124     int wblen = 0;                     /* workbuf len */
3125     int buflen;                        /* amount of memory allocated to workbuf */
3126
3127     buflen = 5120;                     /* Default size */
3128     workbuf = smalloc(buflen * sizeof(wchar_t));
3129     wbptr = workbuf;                   /* start filling here */
3130     old_top_x = top.x;                 /* needed for rect==1 */
3131
3132     while (poslt(top, bottom)) {
3133         int nl = FALSE;
3134         unsigned long *ldata = lineptr(top.y);
3135         pos nlpos;
3136
3137         /*
3138          * nlpos will point at the maximum position on this line we
3139          * should copy up to. So we start it at the end of the
3140          * line...
3141          */
3142         nlpos.y = top.y;
3143         nlpos.x = term->cols;
3144
3145         /*
3146          * ... move it backwards if there's unused space at the end
3147          * of the line (and also set `nl' if this is the case,
3148          * because in normal selection mode this means we need a
3149          * newline at the end)...
3150          */
3151         if (!(ldata[term->cols] & LATTR_WRAPPED)) {
3152             while (((ldata[nlpos.x - 1] & 0xFF) == 0x20 ||
3153                     (DIRECT_CHAR(ldata[nlpos.x - 1]) &&
3154                      (ldata[nlpos.x - 1] & CHAR_MASK) == 0x20))
3155                    && poslt(top, nlpos))
3156                 decpos(nlpos);
3157             if (poslt(nlpos, bottom))
3158                 nl = TRUE;
3159         }
3160
3161         /*
3162          * ... and then clip it to the terminal x coordinate if
3163          * we're doing rectangular selection. (In this case we
3164          * still did the above, so that copying e.g. the right-hand
3165          * column from a table doesn't fill with spaces on the
3166          * right.)
3167          */
3168         if (rect) {
3169             if (nlpos.x > bottom.x)
3170                 nlpos.x = bottom.x;
3171             nl = (top.y < bottom.y);
3172         }
3173
3174         while (poslt(top, bottom) && poslt(top, nlpos)) {
3175 #if 0
3176             char cbuf[16], *p;
3177             sprintf(cbuf, "<U+%04x>", (ldata[top.x] & 0xFFFF));
3178 #else
3179             wchar_t cbuf[16], *p;
3180             int uc = (ldata[top.x] & 0xFFFF);
3181             int set, c;
3182
3183             if (uc == UCSWIDE) {
3184                 top.x++;
3185                 continue;
3186             }
3187
3188             switch (uc & CSET_MASK) {
3189               case ATTR_LINEDRW:
3190                 if (!cfg.rawcnp) {
3191                     uc = unitab_xterm[uc & 0xFF];
3192                     break;
3193                 }
3194               case ATTR_ASCII:
3195                 uc = unitab_line[uc & 0xFF];
3196                 break;
3197               case ATTR_SCOACS:
3198                 uc = unitab_scoacs[uc&0xFF];
3199                 break;
3200             }
3201             switch (uc & CSET_MASK) {
3202               case ATTR_ACP:
3203                 uc = unitab_font[uc & 0xFF];
3204                 break;
3205               case ATTR_OEMCP:
3206                 uc = unitab_oemcp[uc & 0xFF];
3207                 break;
3208             }
3209
3210             set = (uc & CSET_MASK);
3211             c = (uc & CHAR_MASK);
3212             cbuf[0] = uc;
3213             cbuf[1] = 0;
3214
3215             if (DIRECT_FONT(uc)) {
3216                 if (c >= ' ' && c != 0x7F) {
3217                     unsigned char buf[4];
3218                     WCHAR wbuf[4];
3219                     int rv;
3220                     if (is_dbcs_leadbyte(font_codepage, (BYTE) c)) {
3221                         buf[0] = c;
3222                         buf[1] = (unsigned char) ldata[top.x + 1];
3223                         rv = mb_to_wc(font_codepage, 0, buf, 2, wbuf, 4);
3224                         top.x++;
3225                     } else {
3226                         buf[0] = c;
3227                         rv = mb_to_wc(font_codepage, 0, buf, 1, wbuf, 4);
3228                     }
3229
3230                     if (rv > 0) {
3231                         memcpy(cbuf, wbuf, rv * sizeof(wchar_t));
3232                         cbuf[rv] = 0;
3233                     }
3234                 }
3235             }
3236 #endif
3237
3238             for (p = cbuf; *p; p++) {
3239                 /* Enough overhead for trailing NL and nul */
3240                 if (wblen >= buflen - 16) {
3241                     workbuf =
3242                         srealloc(workbuf,
3243                                  sizeof(wchar_t) * (buflen += 100));
3244                     wbptr = workbuf + wblen;
3245                 }
3246                 wblen++;
3247                 *wbptr++ = *p;
3248             }
3249             top.x++;
3250         }
3251         if (nl) {
3252             int i;
3253             for (i = 0; i < sel_nl_sz; i++) {
3254                 wblen++;
3255                 *wbptr++ = sel_nl[i];
3256             }
3257         }
3258         top.y++;
3259         top.x = rect ? old_top_x : 0;
3260     }
3261 #if SELECTION_NUL_TERMINATED
3262     wblen++;
3263     *wbptr++ = 0;
3264 #endif
3265     write_clip(workbuf, wblen, FALSE); /* transfer to clipboard */
3266     if (buflen > 0)                    /* indicates we allocated this buffer */
3267         sfree(workbuf);
3268 }
3269
3270 void term_copyall(Terminal *term)
3271 {
3272     pos top;
3273     top.y = -count234(term->scrollback);
3274     top.x = 0;
3275     clipme(term, top, term->curs, 0);
3276 }
3277
3278 /*
3279  * The wordness array is mainly for deciding the disposition of the
3280  * US-ASCII characters.
3281  */
3282 static int wordtype(Terminal *term, int uc)
3283 {
3284     static struct {
3285         int start, end, ctype;
3286     } *wptr, ucs_words[] = {
3287         {
3288         128, 160, 0}, {
3289         161, 191, 1}, {
3290         215, 215, 1}, {
3291         247, 247, 1}, {
3292         0x037e, 0x037e, 1},            /* Greek question mark */
3293         {
3294         0x0387, 0x0387, 1},            /* Greek ano teleia */
3295         {
3296         0x055a, 0x055f, 1},            /* Armenian punctuation */
3297         {
3298         0x0589, 0x0589, 1},            /* Armenian full stop */
3299         {
3300         0x0700, 0x070d, 1},            /* Syriac punctuation */
3301         {
3302         0x104a, 0x104f, 1},            /* Myanmar punctuation */
3303         {
3304         0x10fb, 0x10fb, 1},            /* Georgian punctuation */
3305         {
3306         0x1361, 0x1368, 1},            /* Ethiopic punctuation */
3307         {
3308         0x166d, 0x166e, 1},            /* Canadian Syl. punctuation */
3309         {
3310         0x17d4, 0x17dc, 1},            /* Khmer punctuation */
3311         {
3312         0x1800, 0x180a, 1},            /* Mongolian punctuation */
3313         {
3314         0x2000, 0x200a, 0},            /* Various spaces */
3315         {
3316         0x2070, 0x207f, 2},            /* superscript */
3317         {
3318         0x2080, 0x208f, 2},            /* subscript */
3319         {
3320         0x200b, 0x27ff, 1},            /* punctuation and symbols */
3321         {
3322         0x3000, 0x3000, 0},            /* ideographic space */
3323         {
3324         0x3001, 0x3020, 1},            /* ideographic punctuation */
3325         {
3326         0x303f, 0x309f, 3},            /* Hiragana */
3327         {
3328         0x30a0, 0x30ff, 3},            /* Katakana */
3329         {
3330         0x3300, 0x9fff, 3},            /* CJK Ideographs */
3331         {
3332         0xac00, 0xd7a3, 3},            /* Hangul Syllables */
3333         {
3334         0xf900, 0xfaff, 3},            /* CJK Ideographs */
3335         {
3336         0xfe30, 0xfe6b, 1},            /* punctuation forms */
3337         {
3338         0xff00, 0xff0f, 1},            /* half/fullwidth ASCII */
3339         {
3340         0xff1a, 0xff20, 1},            /* half/fullwidth ASCII */
3341         {
3342         0xff3b, 0xff40, 1},            /* half/fullwidth ASCII */
3343         {
3344         0xff5b, 0xff64, 1},            /* half/fullwidth ASCII */
3345         {
3346         0xfff0, 0xffff, 0},            /* half/fullwidth ASCII */
3347         {
3348         0, 0, 0}
3349     };
3350
3351     uc &= (CSET_MASK | CHAR_MASK);
3352
3353     switch (uc & CSET_MASK) {
3354       case ATTR_LINEDRW:
3355         uc = unitab_xterm[uc & 0xFF];
3356         break;
3357       case ATTR_ASCII:
3358         uc = unitab_line[uc & 0xFF];
3359         break;
3360       case ATTR_SCOACS:
3361         uc = unitab_scoacs[uc&0xFF];
3362         break;
3363     }
3364     switch (uc & CSET_MASK) {
3365       case ATTR_ACP:
3366         uc = unitab_font[uc & 0xFF];
3367         break;
3368       case ATTR_OEMCP:
3369         uc = unitab_oemcp[uc & 0xFF];
3370         break;
3371     }
3372
3373     /* For DBCS font's I can't do anything usefull. Even this will sometimes
3374      * fail as there's such a thing as a double width space. :-(
3375      */
3376     if (dbcs_screenfont && font_codepage == line_codepage)
3377         return (uc != ' ');
3378
3379     if (uc < 0x80)
3380         return term->wordness[uc];
3381
3382     for (wptr = ucs_words; wptr->start; wptr++) {
3383         if (uc >= wptr->start && uc <= wptr->end)
3384             return wptr->ctype;
3385     }
3386
3387     return 2;
3388 }
3389
3390 /*
3391  * Spread the selection outwards according to the selection mode.
3392  */
3393 static pos sel_spread_half(Terminal *term, pos p, int dir)
3394 {
3395     unsigned long *ldata;
3396     short wvalue;
3397     int topy = -count234(term->scrollback);
3398
3399     ldata = lineptr(p.y);
3400
3401     switch (term->selmode) {
3402       case SM_CHAR:
3403         /*
3404          * In this mode, every character is a separate unit, except
3405          * for runs of spaces at the end of a non-wrapping line.
3406          */
3407         if (!(ldata[term->cols] & LATTR_WRAPPED)) {
3408             unsigned long *q = ldata + term->cols;
3409             while (q > ldata && (q[-1] & CHAR_MASK) == 0x20)
3410                 q--;
3411             if (q == ldata + term->cols)
3412                 q--;
3413             if (p.x >= q - ldata)
3414                 p.x = (dir == -1 ? q - ldata : term->cols - 1);
3415         }
3416         break;
3417       case SM_WORD:
3418         /*
3419          * In this mode, the units are maximal runs of characters
3420          * whose `wordness' has the same value.
3421          */
3422         wvalue = wordtype(term, ldata[p.x]);
3423         if (dir == +1) {
3424             while (1) {
3425                 if (p.x < term->cols-1) {
3426                     if (wordtype(term, ldata[p.x + 1]) == wvalue)
3427                         p.x++;
3428                     else
3429                         break;
3430                 } else {
3431                     if (ldata[term->cols] & LATTR_WRAPPED) {
3432                         unsigned long *ldata2;
3433                         ldata2 = lineptr(p.y+1);
3434                         if (wordtype(term, ldata2[0]) == wvalue) {
3435                             p.x = 0;
3436                             p.y++;
3437                             ldata = ldata2;
3438                         } else
3439                             break;
3440                     } else
3441                         break;
3442                 }
3443             }
3444         } else {
3445             while (1) {
3446                 if (p.x > 0) {
3447                     if (wordtype(term, ldata[p.x - 1]) == wvalue)
3448                         p.x--;
3449                     else
3450                         break;
3451                 } else {
3452                     unsigned long *ldata2;
3453                     if (p.y <= topy)
3454                         break;
3455                     ldata2 = lineptr(p.y-1);
3456                     if ((ldata2[term->cols] & LATTR_WRAPPED) &&
3457                         wordtype(term, ldata2[term->cols-1]) == wvalue) {
3458                         p.x = term->cols-1;
3459                         p.y--;
3460                         ldata = ldata2;
3461                     } else
3462                         break;
3463                 }
3464             }
3465         }
3466         break;
3467       case SM_LINE:
3468         /*
3469          * In this mode, every line is a unit.
3470          */
3471         p.x = (dir == -1 ? 0 : term->cols - 1);
3472         break;
3473     }
3474     return p;
3475 }
3476
3477 static void sel_spread(Terminal *term)
3478 {
3479     if (term->seltype == LEXICOGRAPHIC) {
3480         term->selstart = sel_spread_half(term, term->selstart, -1);
3481         decpos(term->selend);
3482         term->selend = sel_spread_half(term, term->selend, +1);
3483         incpos(term->selend);
3484     }
3485 }
3486
3487 void term_do_paste(Terminal *term)
3488 {
3489     wchar_t *data;
3490     int len;
3491
3492     get_clip(&data, &len);
3493     if (data && len > 0) {
3494         wchar_t *p, *q;
3495
3496         term_seen_key_event(term);     /* pasted data counts */
3497
3498         if (term->paste_buffer)
3499             sfree(term->paste_buffer);
3500         term->paste_pos = term->paste_hold = term->paste_len = 0;
3501         term->paste_buffer = smalloc(len * sizeof(wchar_t));
3502
3503         p = q = data;
3504         while (p < data + len) {
3505             while (p < data + len &&
3506                    !(p <= data + len - sel_nl_sz &&
3507                      !memcmp(p, sel_nl, sizeof(sel_nl))))
3508                 p++;
3509
3510             {
3511                 int i;
3512                 for (i = 0; i < p - q; i++) {
3513                     term->paste_buffer[term->paste_len++] = q[i];
3514                 }
3515             }
3516
3517             if (p <= data + len - sel_nl_sz &&
3518                 !memcmp(p, sel_nl, sizeof(sel_nl))) {
3519                 term->paste_buffer[term->paste_len++] = '\r';
3520                 p += sel_nl_sz;
3521             }
3522             q = p;
3523         }
3524
3525         /* Assume a small paste will be OK in one go. */
3526         if (term->paste_len < 256) {
3527             luni_send(term->paste_buffer, term->paste_len, 0);
3528             if (term->paste_buffer)
3529                 sfree(term->paste_buffer);
3530             term->paste_buffer = 0;
3531             term->paste_pos = term->paste_hold = term->paste_len = 0;
3532         }
3533     }
3534     get_clip(NULL, NULL);
3535 }
3536
3537 void term_mouse(Terminal *term, Mouse_Button b, Mouse_Action a, int x, int y,
3538                 int shift, int ctrl, int alt)
3539 {
3540     pos selpoint;
3541     unsigned long *ldata;
3542     int raw_mouse = (term->xterm_mouse &&
3543                      !cfg.no_mouse_rep &&
3544                      !(cfg.mouse_override && shift));
3545     int default_seltype;
3546
3547     if (y < 0) {
3548         y = 0;
3549         if (a == MA_DRAG && !raw_mouse)
3550             term_scroll(term, 0, -1);
3551     }
3552     if (y >= term->rows) {
3553         y = term->rows - 1;
3554         if (a == MA_DRAG && !raw_mouse)
3555             term_scroll(term, 0, +1);
3556     }
3557     if (x < 0) {
3558         if (y > 0) {
3559             x = term->cols - 1;
3560             y--;
3561         } else
3562             x = 0;
3563     }
3564     if (x >= term->cols)
3565         x = term->cols - 1;
3566
3567     selpoint.y = y + term->disptop;
3568     selpoint.x = x;
3569     ldata = lineptr(selpoint.y);
3570     if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM)
3571         selpoint.x /= 2;
3572
3573     if (raw_mouse) {
3574         int encstate = 0, r, c;
3575         char abuf[16];
3576         static int is_down = 0;
3577
3578         switch (b) {
3579           case MBT_LEFT:
3580             encstate = 0x20;           /* left button down */
3581             break;
3582           case MBT_MIDDLE:
3583             encstate = 0x21;
3584             break;
3585           case MBT_RIGHT:
3586             encstate = 0x22;
3587             break;
3588           case MBT_WHEEL_UP:
3589             encstate = 0x60;
3590             break;
3591           case MBT_WHEEL_DOWN:
3592             encstate = 0x61;
3593             break;
3594           default: break;              /* placate gcc warning about enum use */
3595         }
3596         switch (a) {
3597           case MA_DRAG:
3598             if (term->xterm_mouse == 1)
3599                 return;
3600             encstate += 0x20;
3601             break;
3602           case MA_RELEASE:
3603             encstate = 0x23;
3604             is_down = 0;
3605             break;
3606           case MA_CLICK:
3607             if (is_down == b)
3608                 return;
3609             is_down = b;
3610             break;
3611           default: break;              /* placate gcc warning about enum use */
3612         }
3613         if (shift)
3614             encstate += 0x04;
3615         if (ctrl)
3616             encstate += 0x10;
3617         r = y + 33;
3618         c = x + 33;
3619
3620         sprintf(abuf, "\033[M%c%c%c", encstate, c, r);
3621         ldisc_send(abuf, 6, 0);
3622         return;
3623     }
3624
3625     b = translate_button(b);
3626
3627     /*
3628      * Set the selection type (rectangular or normal) at the start
3629      * of a selection attempt, from the state of Alt.
3630      */
3631     if (!alt ^ !cfg.rect_select)
3632         default_seltype = RECTANGULAR;
3633     else
3634         default_seltype = LEXICOGRAPHIC;
3635
3636     if (term->selstate == NO_SELECTION) {
3637         term->seltype = default_seltype;
3638     }
3639
3640     if (b == MBT_SELECT && a == MA_CLICK) {
3641         deselect(term);
3642         term->selstate = ABOUT_TO;
3643         term->seltype = default_seltype;
3644         term->selanchor = selpoint;
3645         term->selmode = SM_CHAR;
3646     } else if (b == MBT_SELECT && (a == MA_2CLK || a == MA_3CLK)) {
3647         deselect(term);
3648         term->selmode = (a == MA_2CLK ? SM_WORD : SM_LINE);
3649         term->selstate = DRAGGING;
3650         term->selstart = term->selanchor = selpoint;
3651         term->selend = term->selstart;
3652         incpos(term->selend);
3653         sel_spread(term);
3654     } else if ((b == MBT_SELECT && a == MA_DRAG) ||
3655                (b == MBT_EXTEND && a != MA_RELEASE)) {
3656         if (term->selstate == ABOUT_TO && poseq(term->selanchor, selpoint))
3657             return;
3658         if (b == MBT_EXTEND && a != MA_DRAG && term->selstate == SELECTED) {
3659             if (term->seltype == LEXICOGRAPHIC) {
3660                 /*
3661                  * For normal selection, we extend by moving
3662                  * whichever end of the current selection is closer
3663                  * to the mouse.
3664                  */
3665                 if (posdiff(selpoint, term->selstart) <
3666                     posdiff(term->selend, term->selstart) / 2) {
3667                     term->selanchor = term->selend;
3668                     decpos(term->selanchor);
3669                 } else {
3670                     term->selanchor = term->selstart;
3671                 }
3672             } else {
3673                 /*
3674                  * For rectangular selection, we have a choice of
3675                  * _four_ places to put selanchor and selpoint: the
3676                  * four corners of the selection.
3677                  */
3678                 if (2*selpoint.x < term->selstart.x + term->selend.x)
3679                     term->selanchor.x = term->selend.x-1;
3680                 else
3681                     term->selanchor.x = term->selstart.x;
3682
3683                 if (2*selpoint.y < term->selstart.y + term->selend.y)
3684                     term->selanchor.y = term->selend.y;
3685                 else
3686                     term->selanchor.y = term->selstart.y;
3687             }
3688             term->selstate = DRAGGING;
3689         }
3690         if (term->selstate != ABOUT_TO && term->selstate != DRAGGING)
3691             term->selanchor = selpoint;
3692         term->selstate = DRAGGING;
3693         if (term->seltype == LEXICOGRAPHIC) {
3694             /*
3695              * For normal selection, we set (selstart,selend) to
3696              * (selpoint,selanchor) in some order.
3697              */
3698             if (poslt(selpoint, term->selanchor)) {
3699                 term->selstart = selpoint;
3700                 term->selend = term->selanchor;
3701                 incpos(term->selend);
3702             } else {
3703                 term->selstart = term->selanchor;
3704                 term->selend = selpoint;
3705                 incpos(term->selend);
3706             }
3707         } else {
3708             /*
3709              * For rectangular selection, we may need to
3710              * interchange x and y coordinates (if the user has
3711              * dragged in the -x and +y directions, or vice versa).
3712              */
3713             term->selstart.x = min(term->selanchor.x, selpoint.x);
3714             term->selend.x = 1+max(term->selanchor.x, selpoint.x);
3715             term->selstart.y = min(term->selanchor.y, selpoint.y);
3716             term->selend.y =   max(term->selanchor.y, selpoint.y);
3717         }
3718         sel_spread(term);
3719     } else if ((b == MBT_SELECT || b == MBT_EXTEND) && a == MA_RELEASE) {
3720         if (term->selstate == DRAGGING) {
3721             /*
3722              * We've completed a selection. We now transfer the
3723              * data to the clipboard.
3724              */
3725             clipme(term, term->selstart, term->selend,
3726                    (term->seltype == RECTANGULAR));
3727             term->selstate = SELECTED;
3728         } else
3729             term->selstate = NO_SELECTION;
3730     } else if (b == MBT_PASTE
3731                && (a == MA_CLICK
3732 #if MULTICLICK_ONLY_EVENT
3733                    || a == MA_2CLK || a == MA_3CLK
3734 #endif
3735                    )) {
3736         request_paste();
3737     }
3738
3739     term_update(term);
3740 }
3741
3742 void term_nopaste(Terminal *term)
3743 {
3744     if (term->paste_len == 0)
3745         return;
3746     sfree(term->paste_buffer);
3747     term->paste_buffer = NULL;
3748     term->paste_len = 0;
3749 }
3750
3751 int term_paste_pending(Terminal *term)
3752 {
3753     return term->paste_len != 0;
3754 }
3755
3756 void term_paste(Terminal *term)
3757 {
3758     long now, paste_diff;
3759
3760     if (term->paste_len == 0)
3761         return;
3762
3763     /* Don't wait forever to paste */
3764     if (term->paste_hold) {
3765         now = GETTICKCOUNT();
3766         paste_diff = now - term->last_paste;
3767         if (paste_diff >= 0 && paste_diff < 450)
3768             return;
3769     }
3770     term->paste_hold = 0;
3771
3772     while (term->paste_pos < term->paste_len) {
3773         int n = 0;
3774         while (n + term->paste_pos < term->paste_len) {
3775             if (term->paste_buffer[term->paste_pos + n++] == '\r')
3776                 break;
3777         }
3778         luni_send(term->paste_buffer + term->paste_pos, n, 0);
3779         term->paste_pos += n;
3780
3781         if (term->paste_pos < term->paste_len) {
3782             term->paste_hold = 1;
3783             return;
3784         }
3785     }
3786     sfree(term->paste_buffer);
3787     term->paste_buffer = NULL;
3788     term->paste_len = 0;
3789 }
3790
3791 static void deselect(Terminal *term)
3792 {
3793     term->selstate = NO_SELECTION;
3794     term->selstart.x = term->selstart.y = term->selend.x = term->selend.y = 0;
3795 }
3796
3797 void term_deselect(Terminal *term)
3798 {
3799     deselect(term);
3800     term_update(term);
3801 }
3802
3803 int term_ldisc(Terminal *term, int option)
3804 {
3805     if (option == LD_ECHO)
3806         return term->term_echoing;
3807     if (option == LD_EDIT)
3808         return term->term_editing;
3809     return FALSE;
3810 }
3811
3812 /*
3813  * from_backend(), to get data from the backend for the terminal.
3814  */
3815 int from_backend(void *vterm, int is_stderr, char *data, int len)
3816 {
3817     Terminal *term = (Terminal *)vterm;
3818
3819     assert(len > 0);
3820
3821     bufchain_add(&term->inbuf, data, len);
3822
3823     /*
3824      * term_out() always completely empties inbuf. Therefore,
3825      * there's no reason at all to return anything other than zero
3826      * from this function, because there _can't_ be a question of
3827      * the remote side needing to wait until term_out() has cleared
3828      * a backlog.
3829      *
3830      * This is a slightly suboptimal way to deal with SSH2 - in
3831      * principle, the window mechanism would allow us to continue
3832      * to accept data on forwarded ports and X connections even
3833      * while the terminal processing was going slowly - but we
3834      * can't do the 100% right thing without moving the terminal
3835      * processing into a separate thread, and that might hurt
3836      * portability. So we manage stdout buffering the old SSH1 way:
3837      * if the terminal processing goes slowly, the whole SSH
3838      * connection stops accepting data until it's ready.
3839      *
3840      * In practice, I can't imagine this causing serious trouble.
3841      */
3842     return 0;
3843 }