terminal.c

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