terminal.c

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