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faster resizing.
[st.git] / st.c
1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <locale.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/ioctl.h>
14 #include <sys/select.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <X11/Xlib.h>
20 #include <X11/keysym.h>
21 #include <X11/Xutil.h>
22
23 /* Arbitrary sizes */
24 #define ESC_TITLE_SIZ 256
25 #define ESC_BUF_SIZ 256
26 #define ESC_ARG_SIZ 16
27 #define DRAW_BUF_SIZ 1024
28
29 #define SERRNO strerror(errno)
30 #define MIN(a, b) ((a) < (b) ? (a) : (b))
31 #define MAX(a, b) ((a) < (b) ? (b) : (a))
32 #define LEN(a) (sizeof(a) / sizeof(a[0]))
33 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
34 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
35 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
36 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
37
38 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
39 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
40 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
41 CURSOR_SAVE, CURSOR_LOAD };
42 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
43 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
44 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
45 enum { SCREEN_UPDATE, SCREEN_REDRAW };
46
47 typedef struct {
48 char c; /* character code */
49 char mode; /* attribute flags */
50 int fg; /* foreground */
51 int bg; /* background */
52 char state; /* state flags */
53 } Glyph;
54
55 typedef Glyph* Line;
56
57 typedef struct {
58 Glyph attr; /* current char attributes */
59 int x;
60 int y;
61 } TCursor;
62
63 /* CSI Escape sequence structs */
64 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
65 typedef struct {
66 char buf[ESC_BUF_SIZ]; /* raw string */
67 int len; /* raw string length */
68 char priv;
69 int arg[ESC_ARG_SIZ];
70 int narg; /* nb of args */
71 char mode;
72 } CSIEscape;
73
74 /* Internal representation of the screen */
75 typedef struct {
76 int row; /* nb row */
77 int col; /* nb col */
78 Line* line; /* screen */
79 TCursor c; /* cursor */
80 char hidec;
81 int top; /* top scroll limit */
82 int bot; /* bottom scroll limit */
83 int mode; /* terminal mode flags */
84 int esc; /* escape state flags */
85 char title[ESC_TITLE_SIZ];
86 int titlelen;
87 } Term;
88
89 /* Purely graphic info */
90 typedef struct {
91 Display* dis;
92 Window win;
93 Pixmap buf;
94 int scr;
95 int w; /* window width */
96 int h; /* window height */
97 int bufw; /* pixmap width */
98 int bufh; /* pixmap height */
99 int ch; /* char height */
100 int cw; /* char width */
101 } XWindow;
102
103 typedef struct {
104 KeySym k;
105 char s[ESC_BUF_SIZ];
106 } Key;
107
108 /* Drawing Context */
109 typedef struct {
110 unsigned long col[256];
111 XFontStruct* font;
112 XFontStruct* bfont;
113 GC gc;
114 } DC;
115
116 #include "config.h"
117
118 static void die(const char *errstr, ...);
119 static void draw(int);
120 static void execsh(void);
121 static void sigchld(int);
122 static void run(void);
123
124 static void csidump(void);
125 static void csihandle(void);
126 static void csiparse(void);
127 static void csireset(void);
128
129 static void tclearregion(int, int, int, int);
130 static void tcursor(int);
131 static void tmovecursor(int);
132 static void tdeletechar(int);
133 static void tdeleteline(int);
134 static void tinsertblank(int);
135 static void tinsertblankline(int);
136 static void tmoveto(int, int);
137 static void tnew(int, int);
138 static void tnewline(void);
139 static void tputtab(void);
140 static void tputc(char);
141 static void tputs(char*, int);
142 static void treset(void);
143 static void tresize(int, int);
144 static void tscroll(void);
145 static void tscrollup(int);
146 static void tscrolldown(int);
147 static void tsetattr(int*, int);
148 static void tsetchar(char);
149 static void tsetscroll(int, int);
150
151 static void ttynew(void);
152 static void ttyread(void);
153 static void ttyresize(int, int);
154 static void ttywrite(const char *, size_t);
155
156 static void xbell(void);
157 static void xdraws(char *, Glyph, int, int, int);
158 static void xhints(void);
159 static void xclear(int, int, int, int);
160 static void xcursor(int);
161 static void xinit(void);
162 static void xloadcols(void);
163
164 static void expose(XEvent *);
165 static char* kmap(KeySym);
166 static void kpress(XEvent *);
167 static void resize(XEvent *);
168
169 static void (*handler[LASTEvent])(XEvent *) = {
170 [KeyPress] = kpress,
171 [Expose] = expose,
172 [ConfigureNotify] = resize
173 };
174
175 /* Globals */
176 static DC dc;
177 static XWindow xw;
178 static Term term;
179 static CSIEscape escseq;
180 static int cmdfd;
181 static pid_t pid;
182 static int running;
183
184 #ifdef DEBUG
185 void
186 tdump(void) {
187 int row, col;
188 Glyph c;
189
190 for(row = 0; row < term.row; row++) {
191 for(col = 0; col < term.col; col++) {
192 if(col == term.c.x && row == term.c.y)
193 putchar('#');
194 else {
195 c = term.line[row][col];
196 putchar(c.state & GLYPH_SET ? c.c : '.');
197 }
198 }
199 putchar('\n');
200 }
201 }
202 #endif
203
204 void
205 die(const char *errstr, ...) {
206 va_list ap;
207
208 va_start(ap, errstr);
209 vfprintf(stderr, errstr, ap);
210 va_end(ap);
211 exit(EXIT_FAILURE);
212 }
213
214 void
215 execsh(void) {
216 char *args[3] = {getenv("SHELL"), "-i", NULL};
217 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
218 putenv("TERM=" TNAME);
219 execvp(args[0], args);
220 }
221
222 void
223 xbell(void) { /* visual bell */
224 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
225 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
226 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
227 /* usleep(30000); */
228 draw(SCREEN_REDRAW);
229 }
230
231 void
232 sigchld(int a) {
233 int stat = 0;
234 if(waitpid(pid, &stat, 0) < 0)
235 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
236 if(WIFEXITED(stat))
237 exit(WEXITSTATUS(stat));
238 else
239 exit(EXIT_FAILURE);
240 }
241
242 void
243 ttynew(void) {
244 int m, s;
245 char *pts;
246
247 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
248 die("openpt failed: %s\n", SERRNO);
249 if(grantpt(m) < 0)
250 die("grantpt failed: %s\n", SERRNO);
251 if(unlockpt(m) < 0)
252 die("unlockpt failed: %s\n", SERRNO);
253 if(!(pts = ptsname(m)))
254 die("ptsname failed: %s\n", SERRNO);
255 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
256 die("Couldn't open slave: %s\n", SERRNO);
257 fcntl(s, F_SETFL, O_NDELAY);
258 switch(pid = fork()) {
259 case -1:
260 die("fork failed\n");
261 break;
262 case 0:
263 setsid(); /* create a new process group */
264 dup2(s, STDIN_FILENO);
265 dup2(s, STDOUT_FILENO);
266 dup2(s, STDERR_FILENO);
267 if(ioctl(s, TIOCSCTTY, NULL) < 0)
268 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
269 close(s);
270 close(m);
271 execsh();
272 break;
273 default:
274 close(s);
275 cmdfd = m;
276 signal(SIGCHLD, sigchld);
277 }
278 }
279
280 void
281 dump(char c) {
282 static int col;
283 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
284 if(++col % 10 == 0)
285 fprintf(stderr, "\n");
286 }
287
288 void
289 ttyread(void) {
290 char buf[BUFSIZ] = {0};
291 int ret;
292
293 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
294 die("Couldn't read from shell: %s\n", SERRNO);
295 else
296 tputs(buf, ret);
297 }
298
299 void
300 ttywrite(const char *s, size_t n) {
301 if(write(cmdfd, s, n) == -1)
302 die("write error on tty: %s\n", SERRNO);
303 }
304
305 void
306 ttyresize(int x, int y) {
307 struct winsize w;
308
309 w.ws_row = term.row;
310 w.ws_col = term.col;
311 w.ws_xpixel = w.ws_ypixel = 0;
312 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
313 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
314 }
315
316 void
317 tcursor(int mode) {
318 static TCursor c;
319
320 if(mode == CURSOR_SAVE)
321 c = term.c;
322 else if(mode == CURSOR_LOAD)
323 term.c = c, tmoveto(c.x, c.y);
324 }
325
326 void
327 treset(void) {
328 term.c.attr.mode = ATTR_NULL;
329 term.c.attr.fg = DefaultFG;
330 term.c.attr.bg = DefaultBG;
331 term.c.x = term.c.y = 0;
332 term.hidec = 0;
333 term.top = 0, term.bot = term.row - 1;
334 term.mode = MODE_WRAP;
335 tclearregion(0, 0, term.col-1, term.row-1);
336 }
337
338 void
339 tnew(int col, int row) { /* screen size */
340 term.row = row, term.col = col;
341 term.top = 0, term.bot = term.row - 1;
342 /* mode */
343 term.mode = MODE_WRAP;
344 /* cursor */
345 term.c.attr.mode = ATTR_NULL;
346 term.c.attr.fg = DefaultFG;
347 term.c.attr.bg = DefaultBG;
348 term.c.x = term.c.y = 0;
349 term.hidec = 0;
350 /* allocate screen */
351 term.line = calloc(term.row, sizeof(Line));
352 for(row = 0 ; row < term.row; row++)
353 term.line[row] = calloc(term.col, sizeof(Glyph));
354 }
355
356 /* TODO: Replace with scrollup/scolldown */
357 void
358 tscroll(void) {
359 Line temp = term.line[term.top];
360 int i;
361
362 for(i = term.top; i < term.bot; i++)
363 term.line[i] = term.line[i+1];
364 memset(temp, 0, sizeof(Glyph) * term.col);
365 term.line[term.bot] = temp;
366 }
367
368 void
369 tscrolldown (int n) {
370 int i;
371 Line temp;
372
373 LIMIT(n, 0, term.bot-term.top+1);
374
375 for(i = 0; i < n; i++)
376 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
377
378 for(i = term.bot; i >= term.top+n; i--) {
379 temp = term.line[i];
380 term.line[i] = term.line[i-n];
381 term.line[i-n] = temp;
382 }
383 }
384
385 void
386 tscrollup (int n) {
387 int i;
388 Line temp;
389 LIMIT(n, 0, term.bot-term.top+1);
390
391 for(i = 0; i < n; i++)
392 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
393
394 for(i = term.top; i <= term.bot-n; i++) {
395 temp = term.line[i];
396 term.line[i] = term.line[i+n];
397 term.line[i+n] = temp;
398 }
399 }
400
401 void
402 tnewline(void) {
403 int y = term.c.y + 1;
404 if(y > term.bot)
405 tscroll(), y = term.bot;
406 tmoveto(0, y);
407 }
408
409 void
410 csiparse(void) {
411 /* int noarg = 1; */
412 char *p = escseq.buf;
413
414 escseq.narg = 0;
415 if(*p == '?')
416 escseq.priv = 1, p++;
417
418 while(p < escseq.buf+escseq.len) {
419 while(isdigit(*p)) {
420 escseq.arg[escseq.narg] *= 10;
421 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
422 }
423 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
424 escseq.narg++, p++;
425 else {
426 escseq.mode = *p;
427 escseq.narg++;
428 return;
429 }
430 }
431 }
432
433 void
434 tmoveto(int x, int y) {
435 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
436 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
437 }
438
439 void
440 tmovecursor(int dir) {
441 int xf = term.c.x, yf = term.c.y;
442
443 switch(dir) {
444 case CURSOR_UP:
445 yf--;
446 break;
447 case CURSOR_DOWN:
448 yf++;
449 break;
450 case CURSOR_LEFT:
451 xf--;
452 break;
453 case CURSOR_RIGHT:
454 xf++;
455 if(term.mode & MODE_WRAP && xf >= term.col) {
456 xf = 0, yf++;
457 if(yf > term.bot)
458 yf = term.bot, tscroll();
459 }
460 break;
461 }
462 tmoveto(xf, yf);
463 }
464
465 void
466 tsetchar(char c) {
467 term.line[term.c.y][term.c.x] = term.c.attr;
468 term.line[term.c.y][term.c.x].c = c;
469 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
470 }
471
472 void
473 tclearregion(int x1, int y1, int x2, int y2) {
474 int y, temp;
475
476 if(x1 > x2)
477 temp = x1, x1 = x2, x2 = temp;
478 if(y1 > y2)
479 temp = y1, y1 = y2, y2 = temp;
480
481 LIMIT(x1, 0, term.col-1);
482 LIMIT(x2, 0, term.col-1);
483 LIMIT(y1, 0, term.row-1);
484 LIMIT(y2, 0, term.row-1);
485
486 for(y = y1; y <= y2; y++)
487 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
488 }
489
490 void
491 tdeletechar(int n) {
492 int src = term.c.x + n;
493 int dst = term.c.x;
494 int size = term.col - src;
495
496 if(src >= term.col) {
497 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
498 return;
499 }
500 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
501 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
502 }
503
504 void
505 tinsertblank(int n) {
506 int src = term.c.x;
507 int dst = src + n;
508 int size = term.col - dst;
509
510 if(dst >= term.col) {
511 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
512 return;
513 }
514 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
515 tclearregion(src, term.c.y, dst - 1, term.c.y);
516 }
517
518 void
519 tinsertblankline(int n) {
520 int i;
521 Line blank;
522 int bot = term.bot;
523
524 if(term.c.y > term.bot)
525 bot = term.row - 1;
526 else if(term.c.y < term.top)
527 bot = term.top - 1;
528 if(term.c.y + n >= bot) {
529 tclearregion(0, term.c.y, term.col-1, bot);
530 return;
531 }
532 for(i = bot; i >= term.c.y+n; i--) {
533 /* swap deleted line <-> blanked line */
534 blank = term.line[i];
535 term.line[i] = term.line[i-n];
536 term.line[i-n] = blank;
537 /* blank it */
538 memset(blank, 0, term.col * sizeof(Glyph));
539 }
540 }
541
542 void
543 tdeleteline(int n) {
544 int i;
545 Line blank;
546 int bot = term.bot;
547
548 if(term.c.y > term.bot)
549 bot = term.row - 1;
550 else if(term.c.y < term.top)
551 bot = term.top - 1;
552 if(term.c.y + n >= bot) {
553 tclearregion(0, term.c.y, term.col-1, bot);
554 return;
555 }
556 for(i = term.c.y; i <= bot-n; i++) {
557 /* swap deleted line <-> blanked line */
558 blank = term.line[i];
559 term.line[i] = term.line[i+n];
560 term.line[i+n] = blank;
561 /* blank it */
562 memset(blank, 0, term.col * sizeof(Glyph));
563 }
564 }
565
566 void
567 tsetattr(int *attr, int l) {
568 int i;
569
570 for(i = 0; i < l; i++) {
571 switch(attr[i]) {
572 case 0:
573 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
574 term.c.attr.fg = DefaultFG;
575 term.c.attr.bg = DefaultBG;
576 break;
577 case 1:
578 term.c.attr.mode |= ATTR_BOLD;
579 break;
580 case 4:
581 term.c.attr.mode |= ATTR_UNDERLINE;
582 break;
583 case 7:
584 term.c.attr.mode |= ATTR_REVERSE;
585 break;
586 case 22:
587 term.c.attr.mode &= ~ATTR_BOLD;
588 break;
589 case 24:
590 term.c.attr.mode &= ~ATTR_UNDERLINE;
591 break;
592 case 27:
593 term.c.attr.mode &= ~ATTR_REVERSE;
594 break;
595 case 38:
596 if (i + 2 < l && attr[i + 1] == 5) {
597 i += 2;
598 if (BETWEEN(attr[i], 0, 255))
599 term.c.attr.fg = attr[i];
600 else
601 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
602 }
603 else
604 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
605 break;
606 case 39:
607 term.c.attr.fg = DefaultFG;
608 break;
609 case 48:
610 if (i + 2 < l && attr[i + 1] == 5) {
611 i += 2;
612 if (BETWEEN(attr[i], 0, 255))
613 term.c.attr.bg = attr[i];
614 else
615 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
616 }
617 else
618 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
619 break;
620 case 49:
621 term.c.attr.bg = DefaultBG;
622 break;
623 default:
624 if(BETWEEN(attr[i], 30, 37))
625 term.c.attr.fg = attr[i] - 30;
626 else if(BETWEEN(attr[i], 40, 47))
627 term.c.attr.bg = attr[i] - 40;
628 else if(BETWEEN(attr[i], 90, 97))
629 term.c.attr.fg = attr[i] - 90 + 8;
630 else if(BETWEEN(attr[i], 100, 107))
631 term.c.attr.fg = attr[i] - 100 + 8;
632 else
633 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
634 break;
635 }
636 }
637 }
638
639 void
640 tsetscroll(int t, int b) {
641 int temp;
642
643 LIMIT(t, 0, term.row-1);
644 LIMIT(b, 0, term.row-1);
645 if(t > b) {
646 temp = t;
647 t = b;
648 b = temp;
649 }
650 term.top = t;
651 term.bot = b;
652 }
653
654 void
655 csihandle(void) {
656 switch(escseq.mode) {
657 default:
658 unknown:
659 printf("erresc: unknown csi ");
660 csidump();
661 /* die(""); */
662 break;
663 case '@': /* ICH -- Insert <n> blank char */
664 DEFAULT(escseq.arg[0], 1);
665 tinsertblank(escseq.arg[0]);
666 break;
667 case 'A': /* CUU -- Cursor <n> Up */
668 case 'e':
669 DEFAULT(escseq.arg[0], 1);
670 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
671 break;
672 case 'B': /* CUD -- Cursor <n> Down */
673 DEFAULT(escseq.arg[0], 1);
674 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
675 break;
676 case 'C': /* CUF -- Cursor <n> Forward */
677 case 'a':
678 DEFAULT(escseq.arg[0], 1);
679 tmoveto(term.c.x+escseq.arg[0], term.c.y);
680 break;
681 case 'D': /* CUB -- Cursor <n> Backward */
682 DEFAULT(escseq.arg[0], 1);
683 tmoveto(term.c.x-escseq.arg[0], term.c.y);
684 break;
685 case 'E': /* CNL -- Cursor <n> Down and first col */
686 DEFAULT(escseq.arg[0], 1);
687 tmoveto(0, term.c.y+escseq.arg[0]);
688 break;
689 case 'F': /* CPL -- Cursor <n> Up and first col */
690 DEFAULT(escseq.arg[0], 1);
691 tmoveto(0, term.c.y-escseq.arg[0]);
692 break;
693 case 'G': /* CHA -- Move to <col> */
694 case '`': /* XXX: HPA -- same? */
695 DEFAULT(escseq.arg[0], 1);
696 tmoveto(escseq.arg[0]-1, term.c.y);
697 break;
698 case 'H': /* CUP -- Move to <row> <col> */
699 case 'f': /* XXX: HVP -- same? */
700 DEFAULT(escseq.arg[0], 1);
701 DEFAULT(escseq.arg[1], 1);
702 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
703 break;
704 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
705 case 'J': /* ED -- Clear screen */
706 switch(escseq.arg[0]) {
707 case 0: /* below */
708 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
709 break;
710 case 1: /* above */
711 tclearregion(0, 0, term.c.x, term.c.y);
712 break;
713 case 2: /* all */
714 tclearregion(0, 0, term.col-1, term.row-1);
715 break;
716 case 3: /* XXX: erase saved lines (xterm) */
717 default:
718 goto unknown;
719 }
720 break;
721 case 'K': /* EL -- Clear line */
722 switch(escseq.arg[0]) {
723 case 0: /* right */
724 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
725 break;
726 case 1: /* left */
727 tclearregion(0, term.c.y, term.c.x, term.c.y);
728 break;
729 case 2: /* all */
730 tclearregion(0, term.c.y, term.col-1, term.c.y);
731 break;
732 }
733 break;
734 case 'S': /* SU -- Scroll <n> line up */
735 DEFAULT(escseq.arg[0], 1);
736 tscrollup(escseq.arg[0]);
737 break;
738 case 'T': /* SD -- Scroll <n> line down */
739 DEFAULT(escseq.arg[0], 1);
740 tscrolldown(escseq.arg[0]);
741 break;
742 case 'L': /* IL -- Insert <n> blank lines */
743 DEFAULT(escseq.arg[0], 1);
744 tinsertblankline(escseq.arg[0]);
745 break;
746 case 'l': /* RM -- Reset Mode */
747 if(escseq.priv) {
748 switch(escseq.arg[0]) {
749 case 1:
750 term.mode &= ~MODE_APPKEYPAD;
751 break;
752 case 7:
753 term.mode &= ~MODE_WRAP;
754 break;
755 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
756 break;
757 case 25:
758 term.hidec = 1;
759 break;
760 case 1048: /* XXX: no alt. screen to erase/save */
761 case 1049:
762 tcursor(CURSOR_LOAD);
763 tclearregion(0, 0, term.col-1, term.row-1);
764 break;
765 default:
766 goto unknown;
767 }
768 } else {
769 switch(escseq.arg[0]) {
770 case 4:
771 term.mode &= ~MODE_INSERT;
772 break;
773 default:
774 goto unknown;
775 }
776 }
777 break;
778 case 'M': /* DL -- Delete <n> lines */
779 DEFAULT(escseq.arg[0], 1);
780 tdeleteline(escseq.arg[0]);
781 break;
782 case 'X': /* ECH -- Erase <n> char */
783 DEFAULT(escseq.arg[0], 1);
784 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
785 break;
786 case 'P': /* DCH -- Delete <n> char */
787 DEFAULT(escseq.arg[0], 1);
788 tdeletechar(escseq.arg[0]);
789 break;
790 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
791 case 'd': /* VPA -- Move to <row> */
792 DEFAULT(escseq.arg[0], 1);
793 tmoveto(term.c.x, escseq.arg[0]-1);
794 break;
795 case 'h': /* SM -- Set terminal mode */
796 if(escseq.priv) {
797 switch(escseq.arg[0]) {
798 case 1:
799 term.mode |= MODE_APPKEYPAD;
800 break;
801 case 7:
802 term.mode |= MODE_WRAP;
803 break;
804 case 12: /* att610 -- Start blinking cursor (IGNORED) */
805 break;
806 case 25:
807 term.hidec = 0;
808 break;
809 case 1048:
810 case 1049: /* XXX: no alt. screen to erase/save */
811 tcursor(CURSOR_SAVE);
812 tclearregion(0, 0, term.col-1, term.row-1);
813 break;
814 default: goto unknown;
815 }
816 } else {
817 switch(escseq.arg[0]) {
818 case 4:
819 term.mode |= MODE_INSERT;
820 break;
821 default: goto unknown;
822 }
823 };
824 break;
825 case 'm': /* SGR -- Terminal attribute (color) */
826 tsetattr(escseq.arg, escseq.narg);
827 break;
828 case 'r': /* DECSTBM -- Set Scrolling Region */
829 if(escseq.priv)
830 goto unknown;
831 else {
832 DEFAULT(escseq.arg[0], 1);
833 DEFAULT(escseq.arg[1], term.row);
834 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
835 }
836 break;
837 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
838 tcursor(CURSOR_SAVE);
839 break;
840 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
841 tcursor(CURSOR_LOAD);
842 break;
843 }
844 }
845
846 void
847 csidump(void) {
848 int i;
849 printf("ESC [ %s", escseq.priv ? "? " : "");
850 if(escseq.narg)
851 for(i = 0; i < escseq.narg; i++)
852 printf("%d ", escseq.arg[i]);
853 if(escseq.mode)
854 putchar(escseq.mode);
855 putchar('\n');
856 }
857
858 void
859 csireset(void) {
860 memset(&escseq, 0, sizeof(escseq));
861 }
862
863 void
864 tputtab(void) {
865 int space = TAB - term.c.x % TAB;
866 tmoveto(term.c.x + space, term.c.y);
867 }
868
869 void
870 tputc(char c) {
871 if(term.esc & ESC_START) {
872 if(term.esc & ESC_CSI) {
873 escseq.buf[escseq.len++] = c;
874 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
875 term.esc = 0;
876 csiparse(), csihandle();
877 }
878 } else if(term.esc & ESC_OSC) {
879 if(c == ';') {
880 term.titlelen = 0;
881 term.esc = ESC_START | ESC_TITLE;
882 }
883 } else if(term.esc & ESC_TITLE) {
884 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
885 term.esc = 0;
886 term.title[term.titlelen] = '\0';
887 XStoreName(xw.dis, xw.win, term.title);
888 } else {
889 term.title[term.titlelen++] = c;
890 }
891 } else if(term.esc & ESC_ALTCHARSET) {
892 switch(c) {
893 case '0': /* Line drawing crap */
894 term.c.attr.mode |= ATTR_GFX;
895 break;
896 case 'B': /* Back to regular text */
897 term.c.attr.mode &= ~ATTR_GFX;
898 break;
899 default:
900 printf("esc unhandled charset: ESC ( %c\n", c);
901 }
902 term.esc = 0;
903 } else {
904 switch(c) {
905 case '[':
906 term.esc |= ESC_CSI;
907 break;
908 case ']':
909 term.esc |= ESC_OSC;
910 break;
911 case '(':
912 term.esc |= ESC_ALTCHARSET;
913 break;
914 case 'A':
915 tmoveto(term.c.x, term.c.y-1);
916 term.esc = 0;
917 break;
918 case 'B':
919 tmoveto(term.c.x, term.c.y+1);
920 term.esc = 0;
921 break;
922 case 'C':
923 tmoveto(term.c.x+1, term.c.y);
924 term.esc = 0;
925 break;
926 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
927 tmoveto(term.c.x-1, term.c.y);
928 term.esc = 0;
929 break;
930 case 'E': /* NEL -- Next line */
931 tnewline();
932 term.esc = 0;
933 break;
934 case 'M': /* RI -- Reverse index */
935 if(term.c.y == term.top)
936 tscrolldown(1);
937 else
938 tmoveto(term.c.x, term.c.y-1);
939 term.esc = 0;
940 break;
941 case 'c': /* RIS -- Reset to inital state */
942 treset();
943 term.esc = 0;
944 break;
945 case '=': /* DECPAM */
946 term.mode |= MODE_APPKEYPAD;
947 term.esc = 0;
948 break;
949 case '>': /* DECPNM */
950 term.mode &= ~MODE_APPKEYPAD;
951 term.esc = 0;
952 break;
953 case '7':
954 tcursor(CURSOR_SAVE);
955 term.esc = 0;
956 break;
957 case '8':
958 tcursor(CURSOR_LOAD);
959 term.esc = 0;
960 break;
961 default:
962 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
963 term.esc = 0;
964 }
965 }
966 } else {
967 switch(c) {
968 case '\t':
969 tputtab();
970 break;
971 case '\b':
972 tmovecursor(CURSOR_LEFT);
973 break;
974 case '\r':
975 tmoveto(0, term.c.y);
976 break;
977 case '\n':
978 tnewline();
979 break;
980 case '\a':
981 xbell();
982 break;
983 case '\033':
984 csireset();
985 term.esc = ESC_START;
986 break;
987 default:
988 tsetchar(c);
989 tmovecursor(CURSOR_RIGHT);
990 break;
991 }
992 }
993 }
994
995 void
996 tputs(char *s, int len) {
997 for(; len > 0; len--)
998 tputc(*s++);
999 }
1000
1001 void
1002 tresize(int col, int row) {
1003 int i;
1004 int minrow = MIN(row, term.row);
1005 int mincol = MIN(col, term.col);
1006
1007 if(col < 1 || row < 1)
1008 return;
1009
1010 for(i = row; i < term.row; i++)
1011 free(term.line[i]);
1012 term.line = realloc(term.line, row * sizeof(Line));
1013 for(i = 0; i < minrow; i++) {
1014 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1015 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1016 }
1017 for(/* i == minrow */; i < row; i++)
1018 term.line[i] = calloc(col, sizeof(Glyph));
1019
1020 LIMIT(term.c.x, 0, col-1);
1021 LIMIT(term.c.y, 0, row-1);
1022 LIMIT(term.top, 0, row-1);
1023 LIMIT(term.bot, 0, row-1);
1024
1025 term.bot = row-1;
1026 term.col = col, term.row = row;
1027 }
1028
1029 void
1030 xloadcols(void) {
1031 int i, r, g, b;
1032 XColor color;
1033 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1034 unsigned long white = WhitePixel(xw.dis, xw.scr);
1035
1036 for(i = 0; i < 16; i++) {
1037 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1038 dc.col[i] = white;
1039 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1040 } else
1041 dc.col[i] = color.pixel;
1042 }
1043
1044 /* same colors as xterm */
1045 for(r = 0; r < 6; r++)
1046 for(g = 0; g < 6; g++)
1047 for(b = 0; b < 6; b++) {
1048 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1049 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1050 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1051 if (!XAllocColor(xw.dis, cmap, &color)) {
1052 dc.col[i] = white;
1053 fprintf(stderr, "Could not allocate color %d\n", i);
1054 } else
1055 dc.col[i] = color.pixel;
1056 i++;
1057 }
1058
1059 for(r = 0; r < 24; r++, i++) {
1060 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1061 if (!XAllocColor(xw.dis, cmap, &color)) {
1062 dc.col[i] = white;
1063 fprintf(stderr, "Could not allocate color %d\n", i);
1064 } else
1065 dc.col[i] = color.pixel;
1066 }
1067 }
1068
1069 void
1070 xclear(int x1, int y1, int x2, int y2) {
1071 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1072 XFillRectangle(xw.dis, xw.buf, dc.gc,
1073 x1 * xw.cw, y1 * xw.ch,
1074 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1075 }
1076
1077 void
1078 xhints(void)
1079 {
1080 XClassHint class = {TNAME, TNAME};
1081 XWMHints wm = {.flags = InputHint, .input = 1};
1082 XSizeHints size = {
1083 .flags = PSize | PResizeInc | PBaseSize,
1084 .height = xw.h,
1085 .width = xw.w,
1086 .height_inc = xw.ch,
1087 .width_inc = xw.cw,
1088 .base_height = 2*BORDER,
1089 .base_width = 2*BORDER,
1090 };
1091 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1092 }
1093
1094 void
1095 xinit(void) {
1096 xw.dis = XOpenDisplay(NULL);
1097 xw.scr = XDefaultScreen(xw.dis);
1098 if(!xw.dis)
1099 die("Can't open display\n");
1100
1101 /* font */
1102 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1103 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1104
1105 /* XXX: Assuming same size for bold font */
1106 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1107 xw.ch = dc.font->ascent + dc.font->descent;
1108
1109 /* colors */
1110 xloadcols();
1111
1112 term.c.attr.fg = DefaultFG;
1113 term.c.attr.bg = DefaultBG;
1114 term.c.attr.mode = ATTR_NULL;
1115 /* windows */
1116 xw.h = term.row * xw.ch + 2*BORDER;
1117 xw.w = term.col * xw.cw + 2*BORDER;
1118 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1119 xw.w, xw.h, 0,
1120 dc.col[DefaultBG],
1121 dc.col[DefaultBG]);
1122 xw.bufw = xw.w - 2*BORDER;
1123 xw.bufh = xw.h - 2*BORDER;
1124 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1125 /* gc */
1126 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1127 XMapWindow(xw.dis, xw.win);
1128 xhints();
1129 XStoreName(xw.dis, xw.win, "st");
1130 XSync(xw.dis, 0);
1131 }
1132
1133 void
1134 xdraws(char *s, Glyph base, int x, int y, int len) {
1135 unsigned long xfg, xbg;
1136 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1137 int i;
1138
1139 if(base.mode & ATTR_REVERSE)
1140 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1141 else
1142 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1143
1144 XSetBackground(xw.dis, dc.gc, xbg);
1145 XSetForeground(xw.dis, dc.gc, xfg);
1146
1147 if(base.mode & ATTR_GFX)
1148 for(i = 0; i < len; i++)
1149 s[i] = gfx[(int)s[i]];
1150
1151 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1152 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1153
1154 if(base.mode & ATTR_UNDERLINE)
1155 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1156 }
1157
1158 void
1159 xcursor(int mode) {
1160 static int oldx = 0;
1161 static int oldy = 0;
1162 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1163
1164 LIMIT(oldx, 0, term.col-1);
1165 LIMIT(oldy, 0, term.row-1);
1166
1167 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1168 g.c = term.line[term.c.y][term.c.x].c;
1169
1170 /* remove the old cursor */
1171 if(term.line[oldy][oldx].state & GLYPH_SET)
1172 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1173 else
1174 xclear(oldx, oldy, oldx, oldy);
1175
1176 /* draw the new one */
1177 if(mode == CURSOR_DRAW) {
1178 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1179 oldx = term.c.x, oldy = term.c.y;
1180 }
1181 }
1182
1183 #ifdef DEBUG
1184 /* basic drawing routines */
1185 void
1186 xdrawc(int x, int y, Glyph g) {
1187 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1188 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1189 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1190 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1191 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1192 }
1193
1194 void
1195 draw(int dummy) {
1196 int x, y;
1197
1198 xclear(0, 0, term.col-1, term.row-1);
1199 for(y = 0; y < term.row; y++)
1200 for(x = 0; x < term.col; x++)
1201 if(term.line[y][x].state & GLYPH_SET)
1202 xdrawc(x, y, term.line[y][x]);
1203
1204 if(!term.hidec)
1205 xcursor(CURSOR_DRAW);
1206 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1207 XFlush(xw.dis);
1208 }
1209
1210 #else
1211 /* optimized drawing routine */
1212 void
1213 draw(int redraw_all) {
1214 int i, x, y, ox;
1215 Glyph base, new;
1216 char buf[DRAW_BUF_SIZ];
1217
1218 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1219 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1220 for(y = 0; y < term.row; y++) {
1221 base = term.line[y][0];
1222 i = ox = 0;
1223 for(x = 0; x < term.col; x++) {
1224 new = term.line[y][x];
1225 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1226 buf[i++] = new.c;
1227 else {
1228 xdraws(buf, base, ox, y, i);
1229 buf[0] = new.c;
1230 i = 1;
1231 ox = x;
1232 base = new;
1233 }
1234 }
1235 xdraws(buf, base, ox, y, i);
1236 }
1237 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1238 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1239 XFlush(xw.dis);
1240 }
1241
1242 #endif
1243
1244 void
1245 expose(XEvent *ev) {
1246 draw(SCREEN_REDRAW);
1247 }
1248
1249 char*
1250 kmap(KeySym k) {
1251 int i;
1252 for(i = 0; i < LEN(key); i++)
1253 if(key[i].k == k)
1254 return (char*)key[i].s;
1255 return NULL;
1256 }
1257
1258 void
1259 kpress(XEvent *ev) {
1260 XKeyEvent *e = &ev->xkey;
1261 KeySym ksym;
1262 char buf[32];
1263 char *customkey;
1264 int len;
1265 int meta;
1266 int shift;
1267
1268 meta = e->state & Mod1Mask;
1269 shift = e->state & ShiftMask;
1270 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1271
1272 if((customkey = kmap(ksym)))
1273 ttywrite(customkey, strlen(customkey));
1274 else if(len > 0) {
1275 buf[sizeof(buf)-1] = '\0';
1276 if(meta && len == 1)
1277 ttywrite("\033", 1);
1278 ttywrite(buf, len);
1279 } else
1280 switch(ksym) {
1281 case XK_Up:
1282 case XK_Down:
1283 case XK_Left:
1284 case XK_Right:
1285 sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1286 ttywrite(buf, 3);
1287 break;
1288 case XK_Insert:
1289 if(shift)
1290 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1291 break;
1292 default:
1293 fprintf(stderr, "errkey: %d\n", (int)ksym);
1294 break;
1295 }
1296 }
1297
1298 void
1299 resize(XEvent *e) {
1300 int col, row;
1301
1302 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1303 return;
1304
1305 xw.w = e->xconfigure.width;
1306 xw.h = e->xconfigure.height;
1307 xw.bufw = xw.w - 2*BORDER;
1308 xw.bufh = xw.h - 2*BORDER;
1309 col = xw.bufw / xw.cw;
1310 row = xw.bufh / xw.ch;
1311 tresize(col, row);
1312 ttyresize(col, row);
1313 XFreePixmap(xw.dis, xw.buf);
1314 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1315 draw(SCREEN_REDRAW);
1316 }
1317
1318 void
1319 run(void) {
1320 XEvent ev;
1321 fd_set rfd;
1322 int xfd = XConnectionNumber(xw.dis);
1323
1324 running = 1;
1325 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1326 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1327
1328 while(running) {
1329 FD_ZERO(&rfd);
1330 FD_SET(cmdfd, &rfd);
1331 FD_SET(xfd, &rfd);
1332 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1333 if(errno == EINTR)
1334 continue;
1335 die("select failed: %s\n", SERRNO);
1336 }
1337 if(FD_ISSET(cmdfd, &rfd)) {
1338 ttyread();
1339 draw(SCREEN_UPDATE);
1340 }
1341 while(XPending(xw.dis)) {
1342 XNextEvent(xw.dis, &ev);
1343 if(handler[ev.type])
1344 (handler[ev.type])(&ev);
1345 }
1346 }
1347 }
1348
1349 int
1350 main(int argc, char *argv[]) {
1351 if(argc == 2 && !strncmp("-v", argv[1], 3))
1352 die("st-" VERSION ", © 2009 st engineers\n");
1353 else if(argc != 1)
1354 die("usage: st [-v]\n");
1355 setlocale(LC_CTYPE, "");
1356 tnew(80, 24);
1357 ttynew();
1358 xinit();
1359 run();
1360 return 0;
1361 }