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