terminal.c

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