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