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