8 static unsigned long *text; /* buffer of text on terminal screen */
9 static unsigned long *scrtop; /* top of working screen */
10 static unsigned long *disptop; /* top of displayed screen */
11 static unsigned long *sbtop; /* top of scrollback */
12 static unsigned long *cpos; /* cursor position (convenience) */
13 static unsigned long *disptext; /* buffer of text on real screen */
14 static unsigned long *wanttext; /* buffer of text we want on screen */
15 static unsigned long *alttext; /* buffer of text on alt. screen */
17 static unsigned char *selspace; /* buffer for building selections in */
19 #define TSIZE (sizeof(*text))
20 #define fix_cpos do { cpos = scrtop + curs_y * (cols+1) + curs_x; } while(0)
22 static unsigned long curr_attr, save_attr;
24 static int curs_x, curs_y; /* cursor */
25 static int save_x, save_y; /* saved cursor position */
26 static int marg_t, marg_b; /* scroll margins */
27 static int dec_om; /* DEC origin mode flag */
28 static int wrap, wrapnext; /* wrap flags */
29 static int insert; /* insert-mode flag */
30 static int cset; /* 0 or 1: which char set */
31 static int save_cset, save_csattr; /* saved with cursor position */
32 static int rvideo; /* global reverse video flag */
34 static unsigned long cset_attr[2];
37 * Saved settings on the alternate screen.
39 static int alt_x, alt_y, alt_om, alt_wrap, alt_wnext, alt_ins, alt_cset;
40 static int alt_t, alt_b;
43 #define ARGS_MAX 32 /* max # of esc sequence arguments */
44 #define ARG_DEFAULT -1 /* if an arg isn't specified */
45 #define def(a,d) ( (a) == ARG_DEFAULT ? (d) : (a) )
46 static int esc_args[ARGS_MAX];
49 #define ANSI(x,y) ((x)+((y)<<8))
50 #define ANSI_QUE(x) ANSI(x,TRUE)
52 #define OSC_STR_MAX 2048
53 static int osc_strlen;
54 static char osc_string[OSC_STR_MAX+1];
57 static unsigned char *tabs;
62 static int scroll_heuristic;
76 OSC_STRING, OSC_MAYBE_ST,
81 NO_SELECTION, ABOUT_TO, DRAGGING, SELECTED
84 SM_CHAR, SM_WORD, SM_LINE
86 static unsigned long *selstart, *selend, *selanchor;
88 static short wordness[256] = {
89 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 01 */
90 0,1,2,1,1,1,1,1,1,1,1,1,1,2,2,2, 2,2,2,2,2,2,2,2,2,2,1,1,1,1,1,1, /* 23 */
91 1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,1,1,1,1,2, /* 45 */
92 1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,1,1,1,1,1, /* 67 */
93 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 89 */
94 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* AB */
95 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2, /* CD */
96 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2, /* EF */
99 static unsigned char sel_nl[] = SEL_NL;
102 * Internal prototypes.
104 static void do_paint (Context, int);
105 static void erase_lots (int, int, int);
106 static void swap_screen (int);
107 static void update_sbar (void);
108 static void deselect (void);
111 * Set up power-on settings for the terminal.
113 static void power_on(void) {
114 curs_x = curs_y = alt_x = alt_y = save_x = save_y = 0;
117 alt_b = marg_b = rows - 1;
122 for (i = 0; i < cols; i++)
123 tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
125 alt_om = dec_om = cfg.dec_om;
126 alt_wnext = wrapnext = alt_ins = insert = FALSE;
127 alt_wrap = wrap = cfg.wrap_mode;
129 cset_attr[0] = cset_attr[1] = ATTR_ASCII;
131 save_attr = curr_attr = ATTR_DEFAULT;
132 app_cursor_keys = cfg.app_cursor;
133 app_keypad_keys = cfg.app_keypad;
137 for (i = 0; i < 256; i++)
138 wordness[i] = cfg.wordness[i];
142 erase_lots (FALSE, TRUE, TRUE);
144 erase_lots (FALSE, TRUE, TRUE);
149 * Force a screen update.
151 void term_update(void) {
155 if ( (seen_key_event && (unscroll_event & US_KEY)) ||
156 (seen_disp_event && (unscroll_event & US_DISP)) ) {
158 seen_disp_event = seen_key_event = 0;
160 do_paint (ctx, TRUE);
163 scroll_heuristic = 0;
168 * Same as power_on(), but an external function.
170 void term_pwron(void) {
179 * Clear the scrollback.
181 void term_clrsb(void) {
182 disptop = sbtop = scrtop;
187 * Initialise the terminal.
189 void term_init(void) {
190 text = sbtop = scrtop = disptop = cpos = NULL;
191 disptext = wanttext = NULL;
201 * Set up the terminal for a given size.
203 void term_size(int newrows, int newcols, int newsavelines) {
204 unsigned long *newtext, *newdisp, *newwant, *newalt;
205 int i, j, crows, ccols;
207 if (newrows == rows && newcols == cols && newsavelines == savelines)
208 return; /* nothing to do */
211 alt_b = marg_b = newrows - 1;
213 newtext = smalloc ((newrows+newsavelines)*(newcols+1)*TSIZE);
214 disptop = newtext + newsavelines*(newcols+1);
215 for (i=0; i<(newrows+newsavelines)*(newcols+1); i++)
216 newtext[i] = ERASE_CHAR;
218 crows = rows + (scrtop - sbtop) / (cols+1);
219 if (crows > newrows+newsavelines)
220 crows = newrows+newsavelines;
221 ccols = (cols < newcols ? cols : newcols);
222 for (i=0; i<crows; i++) {
223 int oldidx = (rows + savelines - crows + i) * (cols+1);
224 int newidx = (newrows + newsavelines - crows + i) * (newcols+1);
225 for (j=0; j<ccols; j++)
226 newtext[newidx+j] = text[oldidx+j];
227 newtext[newidx+newcols] =
228 (cols == newcols ? text[oldidx+cols] : 0);
230 sbtop = disptop - (crows - newrows) * (newcols+1);
239 newdisp = smalloc (newrows*(newcols+1)*TSIZE);
240 for (i=0; i<newrows*(newcols+1); i++)
241 newdisp[i] = ATTR_INVALID;
245 newwant = smalloc (newrows*(newcols+1)*TSIZE);
246 for (i=0; i<newrows*(newcols+1); i++)
247 newwant[i] = ATTR_INVALID;
251 newalt = smalloc (newrows*(newcols+1)*TSIZE);
252 for (i=0; i<newrows*(newcols+1); i++)
253 newalt[i] = ERASE_CHAR;
258 selspace = smalloc ( (newrows+newsavelines) * (newcols+sizeof(sel_nl)) );
260 tabs = srealloc (tabs, newcols*sizeof(*tabs));
263 for (i = (cols > 0 ? cols : 0); i < newcols; i++)
264 tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
268 curs_y += newrows - rows;
271 if (curs_y >= newrows)
273 if (curs_x >= newcols)
276 wrapnext = alt_wnext = FALSE;
280 savelines = newsavelines;
291 static void swap_screen (int which) {
295 if (which == alt_which)
300 for (t=0; t<rows*(cols+1); t++) {
301 tt = scrtop[t]; scrtop[t] = alttext[t]; alttext[t] = tt;
304 t = curs_x; curs_x = alt_x; alt_x = t;
305 t = curs_y; curs_y = alt_y; alt_y = t;
306 t = marg_t; marg_t = alt_t; alt_t = t;
307 t = marg_b; marg_b = alt_b; alt_b = t;
308 t = dec_om; dec_om = alt_om; alt_om = t;
309 t = wrap; wrap = alt_wrap; alt_wrap = t;
310 t = wrapnext; wrapnext = alt_wnext; alt_wnext = t;
311 t = insert; insert = alt_ins; alt_ins = t;
312 t = cset; cset = alt_cset; alt_cset = t;
318 * Retrieve a character from `inbuf'.
320 static int inbuf_getc(void) {
321 if (inbuf_head == inbuf_reap)
325 inbuf_reap = (inbuf_reap+1) & INBUF_MASK;
331 * Update the scroll bar.
333 static void update_sbar(void) {
336 min = (sbtop - text) / (cols+1);
337 set_sbar ((scrtop - text) / (cols+1) + rows - min,
338 (disptop - text) / (cols+1) - min,
343 * Check whether the region bounded by the two pointers intersects
344 * the scroll region, and de-select the on-screen selection if so.
346 static void check_selection (unsigned long *from, unsigned long *to) {
347 if (from < selend && selstart < to)
352 * Scroll the screen. (`lines' is +ve for scrolling forward, -ve
353 * for backward.) `sb' is TRUE if the scrolling is permitted to
354 * affect the scrollback buffer.
356 static void scroll (int topline, int botline, int lines, int sb) {
357 unsigned long *scroll_top;
358 int scroll_size, size, i;
360 scroll_top = scrtop + topline*(cols+1);
361 size = (lines < 0 ? -lines : lines) * (cols+1);
362 scroll_size = (botline - topline + 1) * (cols+1) - size;
364 if (lines > 0 && topline == 0 && alt_which == 0 && sb) {
366 * Since we're going to scroll the top line and we're on the
367 * scrolling screen let's also affect the scrollback buffer.
369 sbtop -= lines * (cols+1);
372 scroll_size += scroll_top - sbtop;
377 if (scroll_size < 0) {
384 memmove (scroll_top, scroll_top + size, scroll_size*TSIZE);
385 for (i = 0; i < size; i++)
386 scroll_top[i+scroll_size] = ERASE_CHAR;
387 if (selstart > scroll_top &&
388 selstart < scroll_top + size + scroll_size) {
390 if (selstart < scroll_top)
391 selstart = scroll_top;
393 if (selend > scroll_top &&
394 selend < scroll_top + size + scroll_size) {
396 if (selend < scroll_top)
401 memmove (scroll_top + size, scroll_top, scroll_size*TSIZE);
402 for (i = 0; i < size; i++)
403 scroll_top[i] = ERASE_CHAR;
404 if (selstart > scroll_top &&
405 selstart < scroll_top + size + scroll_size) {
407 if (selstart > scroll_top + size + scroll_size)
408 selstart = scroll_top + size + scroll_size;
410 if (selend > scroll_top &&
411 selend < scroll_top + size + scroll_size) {
413 if (selend > scroll_top + size + scroll_size)
414 selend = scroll_top + size + scroll_size;
418 scroll_heuristic += lines;
422 * Move the cursor to a given position, clipping at boundaries. We
423 * may or may not want to clip at the scroll margin: marg_clip is 0
424 * not to, 1 to disallow _passing_ the margins, and 2 to disallow
425 * even _being_ outside the margins.
427 static void move (int x, int y, int marg_clip) {
433 if ((curs_y >= marg_t || marg_clip == 2) && y < marg_t)
435 if ((curs_y <= marg_b || marg_clip == 2) && y > marg_b)
449 * Save or restore the cursor and SGR mode.
451 static void save_cursor(int save) {
455 save_attr = curr_attr;
457 save_csattr = cset_attr[cset];
461 curr_attr = save_attr;
463 cset_attr[cset] = save_csattr;
469 * Erase a large portion of the screen: the whole screen, or the
470 * whole line, or parts thereof.
472 static void erase_lots (int line_only, int from_begin, int to_end) {
473 unsigned long *startpos, *endpos;
476 startpos = cpos - curs_x;
477 endpos = startpos + cols+1;
480 endpos = startpos + rows * (cols+1);
486 check_selection (startpos, endpos);
487 while (startpos < endpos)
488 *startpos++ = ERASE_CHAR;
492 * Insert or delete characters within the current line. n is +ve if
493 * insertion is desired, and -ve for deletion.
495 static void insch (int n) {
496 int dir = (n < 0 ? -1 : +1);
499 n = (n < 0 ? -n : n);
500 if (n > cols - curs_x)
502 m = cols - curs_x - n;
503 check_selection (cpos, cpos+n);
505 memmove (cpos, cpos+n, m*TSIZE);
507 cpos[m++] = ERASE_CHAR;
509 memmove (cpos+n, cpos, m*TSIZE);
511 cpos[n] = ERASE_CHAR;
516 * Toggle terminal mode `mode' to state `state'. (`query' indicates
517 * whether the mode is a DEC private one or a normal one.)
519 static void toggle_mode (int mode, int query, int state) {
520 if (query) switch (mode) {
521 case 1: /* application cursor keys */
522 app_cursor_keys = state;
524 case 3: /* 80/132 columns */
526 request_resize (state ? 132 : 80, rows);
528 case 5: /* reverse video */
530 seen_disp_event = TRUE;
532 case 6: /* DEC origin mode */
535 case 7: /* auto wrap */
538 case 47: /* alternate screen */
543 } else switch (mode) {
544 case 4: /* set insert mode */
551 * Process an OSC sequence: set window title or icon name.
553 static void do_osc(void) {
556 wordness[(unsigned char)osc_string[osc_strlen]] = esc_args[0];
558 osc_string[osc_strlen] = '\0';
559 switch (esc_args[0]) {
562 set_icon (osc_string);
563 if (esc_args[0] == 1)
565 /* fall through: parameter 0 means set both */
568 set_title (osc_string);
575 * Remove everything currently in `inbuf' and stick it up on the
576 * in-memory display. There's a big state machine in here to
577 * process escape sequences...
579 void term_out(void) {
582 while ( (c = inbuf_getc()) != -1) {
584 * Optionally log the session traffic to a file. Useful for
585 * debugging and possibly also useful for actual logging.
588 static FILE *fp = NULL;
589 if (!fp) fp = fopen(logfile, "wb");
590 if (fp) fputc (c, fp);
592 if( termstate < DO_CTRLS && (c&0x60) == 0 ) {
594 case '\005': /* terminal type query */
595 ldisc->send ("PuTTY\r", 6);
602 if (curs_x == 0 && curs_y > 0)
603 curs_x = cols-1, curs_y--;
609 seen_disp_event = TRUE;
618 termstate = SEEN_ESC;
621 termstate = SEEN_CSI;
623 esc_args[0] = ARG_DEFAULT;
627 termstate = SEEN_OSC;
634 seen_disp_event = TRUE;
639 if (curs_y == marg_b)
640 scroll (marg_t, marg_b, 1, TRUE);
641 else if (curs_y < rows-1)
653 } while (curs_x < cols-1 && !tabs[curs_x]);
657 unsigned long *old_cpos = cpos;
659 check_selection (old_cpos, cpos);
661 seen_disp_event = TRUE;
665 else switch (termstate) {
667 /* Only graphic characters get this far, ctrls are stripped above */
669 cpos[1] = ATTR_WRAPPED;
670 if (curs_y == marg_b)
671 scroll (marg_t, marg_b, 1, TRUE);
672 else if (curs_y < rows-1)
681 check_selection (cpos, cpos+1);
682 *cpos++ = xlat_tty2scr((unsigned char)c) | curr_attr |
683 (c <= 0x7F ? cset_attr[cset] : ATTR_ASCII);
685 if (curs_x == cols) {
694 termstate = TOPLEVEL;
698 * This state is virtually identical to SEEN_ESC, with the
699 * exception that we have an OSC sequence in the pipeline,
700 * and _if_ we see a backslash, we process it.
704 termstate = TOPLEVEL;
707 /* else fall through */
709 termstate = TOPLEVEL;
711 case ' ': /* some weird sequence? */
712 termstate = IGNORE_NEXT;
714 case '[': /* enter CSI mode */
715 termstate = SEEN_CSI;
717 esc_args[0] = ARG_DEFAULT;
720 case ']': /* xterm escape sequences */
721 termstate = SEEN_OSC;
724 case '(': /* should set GL */
727 case ')': /* should set GR */
730 case '7': /* save cursor */
733 case '8': /* restore cursor */
735 seen_disp_event = TRUE;
738 app_keypad_keys = TRUE;
741 app_keypad_keys = FALSE;
743 case 'D': /* exactly equivalent to LF */
744 if (curs_y == marg_b)
745 scroll (marg_t, marg_b, 1, TRUE);
746 else if (curs_y < rows-1)
750 seen_disp_event = TRUE;
753 case 'E': /* exactly equivalent to CR-LF */
756 if (curs_y == marg_b)
757 scroll (marg_t, marg_b, 1, TRUE);
758 else if (curs_y < rows-1)
763 seen_disp_event = TRUE;
765 case 'M': /* reverse index - backwards LF */
766 if (curs_y == marg_t)
767 scroll (marg_t, marg_b, -1, TRUE);
772 seen_disp_event = TRUE;
774 case 'Z': /* terminal type query */
775 ldisc->send ("\033[?6c", 5);
777 case 'c': /* restore power-on settings */
781 seen_disp_event = TRUE;
783 case '#': /* ESC # 8 fills screen with Es :-) */
784 termstate = SEEN_ESCHASH;
786 case 'H': /* set a tab */
792 termstate = TOPLEVEL; /* default */
795 if (esc_nargs <= ARGS_MAX) {
796 if (esc_args[esc_nargs-1] == ARG_DEFAULT)
797 esc_args[esc_nargs-1] = 0;
798 esc_args[esc_nargs-1] =
799 10 * esc_args[esc_nargs-1] + c - '0';
801 termstate = SEEN_CSI;
805 if (++esc_nargs <= ARGS_MAX)
806 esc_args[esc_nargs-1] = ARG_DEFAULT;
807 termstate = SEEN_CSI;
811 if( esc_query ) esc_query = -1;
812 else if( c == '?' ) esc_query = TRUE;
814 termstate = SEEN_CSI;
816 else switch (ANSI(c,esc_query)) {
817 case 'A': /* move up N lines */
818 move (curs_x, curs_y - def(esc_args[0], 1), 1);
819 seen_disp_event = TRUE;
821 case 'B': case 'e': /* move down N lines */
822 move (curs_x, curs_y + def(esc_args[0], 1), 1);
823 seen_disp_event = TRUE;
825 case 'C': case 'a': /* move right N cols */
826 move (curs_x + def(esc_args[0], 1), curs_y, 1);
827 seen_disp_event = TRUE;
829 case 'D': /* move left N cols */
830 move (curs_x - def(esc_args[0], 1), curs_y, 1);
831 seen_disp_event = TRUE;
833 case 'E': /* move down N lines and CR */
834 move (0, curs_y + def(esc_args[0], 1), 1);
835 seen_disp_event = TRUE;
837 case 'F': /* move up N lines and CR */
838 move (0, curs_y - def(esc_args[0], 1), 1);
839 seen_disp_event = TRUE;
841 case 'G': case '`': /* set horizontal posn */
842 move (def(esc_args[0], 1) - 1, curs_y, 0);
843 seen_disp_event = TRUE;
845 case 'd': /* set vertical posn */
846 move (curs_x, (dec_om ? marg_t : 0) + def(esc_args[0], 1) - 1,
848 seen_disp_event = TRUE;
850 case 'H': case 'f': /* set horz and vert posns at once */
852 esc_args[1] = ARG_DEFAULT;
853 move (def(esc_args[1], 1) - 1,
854 (dec_om ? marg_t : 0) + def(esc_args[0], 1) - 1,
856 seen_disp_event = TRUE;
858 case 'J': /* erase screen or parts of it */
860 unsigned int i = def(esc_args[0], 0) + 1;
863 erase_lots(FALSE, !!(i & 2), !!(i & 1));
866 seen_disp_event = TRUE;
868 case 'K': /* erase line or parts of it */
870 unsigned int i = def(esc_args[0], 0) + 1;
873 erase_lots(TRUE, !!(i & 2), !!(i & 1));
875 seen_disp_event = TRUE;
877 case 'L': /* insert lines */
878 if (curs_y <= marg_b)
879 scroll (curs_y, marg_b, -def(esc_args[0], 1), FALSE);
880 seen_disp_event = TRUE;
882 case 'M': /* delete lines */
883 if (curs_y <= marg_b)
884 scroll (curs_y, marg_b, def(esc_args[0], 1), TRUE);
885 seen_disp_event = TRUE;
887 case '@': /* insert chars */
888 insch (def(esc_args[0], 1));
889 seen_disp_event = TRUE;
891 case 'P': /* delete chars */
892 insch (-def(esc_args[0], 1));
893 seen_disp_event = TRUE;
895 case 'c': /* terminal type query */
896 ldisc->send ("\033[?6c", 5);
898 case 'n': /* cursor position query */
899 if (esc_args[0] == 6) {
901 sprintf (buf, "\033[%d;%dR", curs_y + 1, curs_x + 1);
902 ldisc->send (buf, strlen(buf));
905 case 'h': /* toggle a mode to high */
907 toggle_mode (esc_args[0], esc_query, TRUE);
909 case 'l': /* toggle a mode to low */
911 toggle_mode (esc_args[0], esc_query, FALSE);
913 case 'g': /* clear tabs */
914 if (esc_nargs == 1) {
915 if (esc_args[0] == 0) {
916 tabs[curs_x] = FALSE;
917 } else if (esc_args[0] == 3) {
919 for (i = 0; i < cols; i++)
924 case 'r': /* set scroll margins */
925 if (esc_nargs <= 2) {
927 top = def(esc_args[0], 1) - 1;
930 bot = (esc_nargs <= 1 || esc_args[1] == 0 ? rows :
931 def(esc_args[1], rows)) - 1;
939 * I used to think the cursor should be
940 * placed at the top of the newly marginned
941 * area. Apparently not: VMS TPU falls over
946 seen_disp_event = TRUE;
950 case 'm': /* set graphics rendition */
953 for (i=0; i<esc_nargs; i++) {
954 switch (def(esc_args[i], 0)) {
955 case 0: /* restore defaults */
956 curr_attr = ATTR_DEFAULT; break;
957 case 1: /* enable bold */
958 curr_attr |= ATTR_BOLD; break;
959 case 4: /* enable underline */
960 case 21: /* (enable double underline) */
961 curr_attr |= ATTR_UNDER; break;
962 case 7: /* enable reverse video */
963 curr_attr |= ATTR_REVERSE; break;
964 case 22: /* disable bold */
965 curr_attr &= ~ATTR_BOLD; break;
966 case 24: /* disable underline */
967 curr_attr &= ~ATTR_UNDER; break;
968 case 27: /* disable reverse video */
969 curr_attr &= ~ATTR_REVERSE; break;
970 case 30: case 31: case 32: case 33:
971 case 34: case 35: case 36: case 37:
973 curr_attr &= ~ATTR_FGMASK;
974 curr_attr |= (esc_args[i] - 30) << ATTR_FGSHIFT;
976 case 39: /* default-foreground */
977 curr_attr &= ~ATTR_FGMASK;
978 curr_attr |= ATTR_DEFFG;
980 case 40: case 41: case 42: case 43:
981 case 44: case 45: case 46: case 47:
983 curr_attr &= ~ATTR_BGMASK;
984 curr_attr |= (esc_args[i] - 40) << ATTR_BGSHIFT;
986 case 49: /* default-background */
987 curr_attr &= ~ATTR_BGMASK;
988 curr_attr |= ATTR_DEFBG;
994 case 's': /* save cursor */
997 case 'u': /* restore cursor */
999 seen_disp_event = TRUE;
1001 case 't': /* set page size - ie window height */
1002 request_resize (cols, def(esc_args[0], 24));
1005 case 'X': /* write N spaces w/o moving cursor */
1007 int n = def(esc_args[0], 1);
1008 unsigned long *p = cpos;
1009 if (n > cols - curs_x)
1011 check_selection (cpos, cpos+n);
1014 seen_disp_event = TRUE;
1017 case 'x': /* report terminal characteristics */
1020 int i = def(esc_args[0], 0);
1021 if (i == 0 || i == 1) {
1022 strcpy (buf, "\033[2;1;1;112;112;1;0x");
1024 ldisc->send (buf, 20);
1034 cset_attr[termstate == SET_GL ? 0 : 1] = ATTR_GBCHR;
1037 cset_attr[termstate == SET_GL ? 0 : 1] = ATTR_LINEDRW;
1039 default: /* specifically, 'B' */
1040 cset_attr[termstate == SET_GL ? 0 : 1] = ATTR_ASCII;
1044 termstate = TOPLEVEL;
1049 case 'P': /* Linux palette sequence */
1050 termstate = SEEN_OSC_P;
1053 case 'R': /* Linux palette reset */
1056 termstate = TOPLEVEL;
1058 case 'W': /* word-set */
1059 termstate = SEEN_OSC_W;
1062 case '0': case '1': case '2': case '3': case '4':
1063 case '5': case '6': case '7': case '8': case '9':
1064 esc_args[0] = 10 * esc_args[0] + c - '0';
1068 * Grotty hack to support xterm and DECterm title
1069 * sequences concurrently.
1071 if (esc_args[0] == 2) {
1075 /* else fall through */
1077 termstate = OSC_STRING;
1083 * This OSC stuff is EVIL. It takes just one character to get into
1084 * sysline mode and it's not initially obvious how to get out.
1085 * So I've added CR and LF as string aborts.
1086 * This shouldn't effect compatibility as I believe embedded
1087 * control characters are supposed to be interpreted (maybe?)
1088 * and they don't display anything useful anyway.
1092 if (c == '\n' || c == '\r') {
1093 termstate = TOPLEVEL;
1094 } else if (c == 0234 || c == '\007' ) {
1096 * These characters terminate the string; ST and BEL
1097 * terminate the sequence and trigger instant
1098 * processing of it, whereas ESC goes back to SEEN_ESC
1099 * mode unless it is followed by \, in which case it is
1100 * synonymous with ST in the first place.
1103 termstate = TOPLEVEL;
1104 } else if (c == '\033')
1105 termstate = OSC_MAYBE_ST;
1106 else if (osc_strlen < OSC_STR_MAX)
1107 osc_string[osc_strlen++] = c;
1111 int max = (osc_strlen == 0 ? 21 : 16);
1113 if (c >= '0' && c <= '9')
1115 else if (c >= 'A' && c <= 'A'+max-10)
1117 else if (c >= 'a' && c <= 'a'+max-10)
1120 termstate = TOPLEVEL;
1121 osc_string[osc_strlen++] = val;
1122 if (osc_strlen >= 7) {
1123 palette_set (osc_string[0],
1124 osc_string[1] * 16 + osc_string[2],
1125 osc_string[3] * 16 + osc_string[4],
1126 osc_string[5] * 16 + osc_string[6]);
1128 termstate = TOPLEVEL;
1134 case '0': case '1': case '2': case '3': case '4':
1135 case '5': case '6': case '7': case '8': case '9':
1136 esc_args[0] = 10 * esc_args[0] + c - '0';
1139 termstate = OSC_STRING;
1145 unsigned long *p = scrtop;
1146 int n = rows * (cols+1);
1148 *p++ = ATTR_DEFAULT | 'E';
1150 seen_disp_event = TRUE;
1151 check_selection (scrtop, scrtop + rows * (cols+1));
1153 termstate = TOPLEVEL;
1156 check_selection (cpos, cpos+1);
1159 if (nl_count > MAXNL)
1164 * Compare two lines to determine whether they are sufficiently
1165 * alike to scroll-optimise one to the other. Return the degree of
1168 static int linecmp (unsigned long *a, unsigned long *b) {
1171 for (i=n=0; i < cols; i++)
1172 n += (*a++ == *b++);
1177 * Given a context, update the window. Out of paranoia, we don't
1178 * allow WM_PAINT responses to do scrolling optimisations.
1180 static void do_paint (Context ctx, int may_optimise){
1181 int i, j, start, our_curs_y;
1182 unsigned long attr, rv, cursor;
1185 cursor = (has_focus ? ATTR_ACTCURS : ATTR_PASCURS);
1186 rv = (rvideo ? ATTR_REVERSE : 0);
1187 our_curs_y = curs_y + (scrtop - disptop) / (cols+1);
1189 for (i=0; i<rows; i++) {
1190 int idx = i*(cols+1);
1191 for (j=0; j<=cols; j++,idx++) {
1192 unsigned long *d = disptop+idx;
1193 wanttext[idx] = ((*d ^ rv
1194 ^ (selstart <= d && d < selend ?
1195 ATTR_REVERSE : 0)) |
1196 (i==our_curs_y && j==curs_x ? cursor : 0));
1201 * We would perform scrolling optimisations in here, if they
1202 * didn't have a nasty tendency to cause the whole sodding
1203 * program to hang for a second at speed-critical moments.
1204 * We'll leave it well alone...
1207 for (i=0; i<rows; i++) {
1208 int idx = i*(cols+1);
1210 for (j=0; j<=cols; j++,idx++) {
1211 unsigned long t = wanttext[idx];
1212 int needs_update = (j < cols && t != disptext[idx]);
1213 int keep_going = (start != -1 && needs_update &&
1214 (t & ATTR_MASK) == attr &&
1215 j-start < sizeof(ch));
1216 if (start != -1 && !keep_going) {
1217 do_text (ctx, start, i, ch, j-start, attr);
1223 attr = t & ATTR_MASK;
1225 ch[j-start] = (char) (t & CHAR_MASK);
1233 * Invalidate the whole screen so it will be repainted in full.
1235 void term_invalidate(void) {
1238 for (i=0; i<rows*(cols+1); i++)
1239 disptext[i] = ATTR_INVALID;
1243 * Paint the window in response to a WM_PAINT message.
1245 void term_paint (Context ctx, int l, int t, int r, int b) {
1246 int i, j, left, top, right, bottom;
1248 left = l / font_width;
1249 right = (r - 1) / font_width;
1250 top = t / font_height;
1251 bottom = (b - 1) / font_height;
1252 for (i = top; i <= bottom && i < rows ; i++)
1253 for (j = left; j <= right && j < cols ; j++)
1254 disptext[i*(cols+1)+j] = ATTR_INVALID;
1256 do_paint (ctx, FALSE);
1260 * Attempt to scroll the scrollback. The second parameter gives the
1261 * position we want to scroll to; the first is +1 to denote that
1262 * this position is relative to the beginning of the scrollback, -1
1263 * to denote it is relative to the end, and 0 to denote that it is
1264 * relative to the current position.
1266 void term_scroll (int rel, int where) {
1267 int n = where * (cols+1);
1269 disptop = (rel < 0 ? scrtop :
1270 rel > 0 ? sbtop : disptop) + n;
1271 if (disptop < sbtop)
1273 if (disptop > scrtop)
1280 * Spread the selection outwards according to the selection mode.
1282 static unsigned long *sel_spread_half (unsigned long *p, int dir) {
1283 unsigned long *linestart, *lineend;
1287 x = (p - text) % (cols+1);
1289 lineend = linestart + cols;
1294 * In this mode, every character is a separate unit, except
1295 * for runs of spaces at the end of a non-wrapping line.
1297 if (!(linestart[cols] & ATTR_WRAPPED)) {
1298 unsigned long *q = lineend;
1299 while (q > linestart && (q[-1] & CHAR_MASK) == 0x20)
1304 p = (dir == -1 ? q : lineend - 1);
1309 * In this mode, the units are maximal runs of characters
1310 * whose `wordness' has the same value.
1312 wvalue = wordness[*p & CHAR_MASK];
1314 while (p < lineend && wordness[p[1] & CHAR_MASK] == wvalue)
1317 while (p > linestart && wordness[p[-1] & CHAR_MASK] == wvalue)
1323 * In this mode, every line is a unit.
1325 p = (dir == -1 ? linestart : lineend - 1);
1331 static void sel_spread (void) {
1332 selstart = sel_spread_half (selstart, -1);
1333 selend = sel_spread_half (selend - 1, +1) + 1;
1336 void term_mouse (Mouse_Button b, Mouse_Action a, int x, int y) {
1337 unsigned long *selpoint;
1340 if (y>=rows) y = rows-1;
1348 if (x>=cols) x = cols-1;
1350 selpoint = disptop + y * (cols+1) + x;
1352 if (b == MB_SELECT && a == MA_CLICK) {
1354 selstate = ABOUT_TO;
1355 selanchor = selpoint;
1357 } else if (b == MB_SELECT && (a == MA_2CLK || a == MA_3CLK)) {
1359 selmode = (a == MA_2CLK ? SM_WORD : SM_LINE);
1360 selstate = DRAGGING;
1361 selstart = selanchor = selpoint;
1362 selend = selstart + 1;
1364 } else if ((b == MB_SELECT && a == MA_DRAG) ||
1365 (b == MB_EXTEND && a != MA_RELEASE)) {
1366 if (selstate == ABOUT_TO && selanchor == selpoint)
1368 if (b == MB_EXTEND && a != MA_DRAG && selstate == SELECTED) {
1369 if (selpoint-selstart < (selend-selstart)/2)
1370 selanchor = selend - 1;
1372 selanchor = selstart;
1373 selstate = DRAGGING;
1375 if (selstate != ABOUT_TO && selstate != DRAGGING)
1376 selanchor = selpoint;
1377 selstate = DRAGGING;
1378 if (selpoint < selanchor) {
1379 selstart = selpoint;
1380 selend = selanchor + 1;
1382 selstart = selanchor;
1383 selend = selpoint + 1;
1386 } else if ((b == MB_SELECT || b == MB_EXTEND) && a == MA_RELEASE) {
1387 if (selstate == DRAGGING) {
1389 * We've completed a selection. We now transfer the
1390 * data to the clipboard.
1392 unsigned char *p = selspace;
1393 unsigned long *q = selstart;
1395 while (q < selend) {
1397 unsigned long *lineend = q - (q-text) % (cols+1) + cols;
1398 unsigned long *nlpos = lineend;
1400 if (!(*nlpos & ATTR_WRAPPED)) {
1401 while ((nlpos[-1] & CHAR_MASK) == 0x20 && nlpos > q)
1406 while (q < nlpos && q < selend)
1407 *p++ = (unsigned char) (*q++ & CHAR_MASK);
1410 for (i=0; i<sizeof(sel_nl); i++)
1413 q = lineend + 1; /* start of next line */
1415 write_clip (selspace, p - selspace);
1416 selstate = SELECTED;
1418 selstate = NO_SELECTION;
1419 } else if (b == MB_PASTE && (a==MA_CLICK || a==MA_2CLK || a==MA_3CLK)) {
1423 get_clip((void **) &data, &len);
1427 while (p < data+len) {
1428 while (p < data+len &&
1429 !(p <= data+len-sizeof(sel_nl) &&
1430 !memcmp(p, sel_nl, sizeof(sel_nl))))
1438 c=xlat_kbd2tty(q[i]);
1443 if (p <= data+len-sizeof(sel_nl) &&
1444 !memcmp(p, sel_nl, sizeof(sel_nl))) {
1445 ldisc->send ("\r", 1);
1446 p += sizeof(sel_nl);
1451 get_clip(NULL, NULL);
1457 static void deselect (void) {
1458 selstate = NO_SELECTION;
1459 selstart = selend = scrtop;
1462 void term_deselect (void) {