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