terminal.c

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