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