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[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 #define TNAME "st-256color"
24
25 /* Arbitrary sizes */
26 #define ESC_TITLE_SIZ 256
27 #define ESC_BUF_SIZ 256
28 #define ESC_ARG_SIZ 16
29 #define DRAW_BUF_SIZ 1024
30
31 #define SERRNO strerror(errno)
32 #define MIN(a, b) ((a) < (b) ? (a) : (b))
33 #define MAX(a, b) ((a) < (b) ? (b) : (a))
34 #define LEN(a) (sizeof(a) / sizeof(a[0]))
35 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
36 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
37 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
38 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
39
40 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
41 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
42 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
43 CURSOR_SAVE, CURSOR_LOAD };
44 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
45 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
46 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
47 enum { SCREEN_UPDATE, SCREEN_REDRAW };
48
49 typedef struct {
50 char c; /* character code */
51 char mode; /* attribute flags */
52 int fg; /* foreground */
53 int bg; /* background */
54 char state; /* state flags */
55 } Glyph;
56
57 typedef Glyph* Line;
58
59 typedef struct {
60 Glyph attr; /* current char attributes */
61 int x;
62 int y;
63 } TCursor;
64
65 /* CSI Escape sequence structs */
66 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
67 typedef struct {
68 char buf[ESC_BUF_SIZ]; /* raw string */
69 int len; /* raw string length */
70 char priv;
71 int arg[ESC_ARG_SIZ];
72 int narg; /* nb of args */
73 char mode;
74 } CSIEscape;
75
76 /* Internal representation of the screen */
77 typedef struct {
78 int row; /* nb row */
79 int col; /* nb col */
80 Line* line; /* screen */
81 TCursor c; /* cursor */
82 char hidec;
83 int top; /* top scroll limit */
84 int bot; /* bottom scroll limit */
85 int mode; /* terminal mode flags */
86 int esc; /* escape state flags */
87 char title[ESC_TITLE_SIZ];
88 int titlelen;
89 } Term;
90
91 /* Purely graphic info */
92 typedef struct {
93 Display* dis;
94 Window win;
95 Pixmap buf;
96 int scr;
97 int w; /* window width */
98 int h; /* window height */
99 int bufw; /* pixmap width */
100 int bufh; /* pixmap height */
101 int ch; /* char height */
102 int cw; /* char width */
103 } XWindow;
104
105 typedef struct {
106 KeySym k;
107 char s[ESC_BUF_SIZ];
108 } Key;
109
110 #include "config.h"
111
112 /* Drawing Context */
113 typedef struct {
114 unsigned long col[256];
115 XFontStruct* font;
116 XFontStruct* bfont;
117 GC gc;
118 } DC;
119
120 static void die(const char *errstr, ...);
121 static void draw(int);
122 static void execsh(void);
123 static void sigchld(int);
124 static void run(void);
125
126 static void csidump(void);
127 static void csihandle(void);
128 static void csiparse(void);
129 static void csireset(void);
130
131 static void tclearregion(int, int, int, int);
132 static void tcursor(int);
133 static void tmovecursor(int);
134 static void tdeletechar(int);
135 static void tdeleteline(int);
136 static void tinsertblank(int);
137 static void tinsertblankline(int);
138 static void tmoveto(int, int);
139 static void tnew(int, int);
140 static void tnewline(void);
141 static void tputc(char);
142 static void tputs(char*, int);
143 static void treset(void);
144 static void tresize(int, int);
145 static void tscroll(void);
146 static void tscrollup(int);
147 static void tscrolldown(int);
148 static void tsetattr(int*, int);
149 static void tsetchar(char);
150 static void tsetscroll(int, int);
151
152 static void ttynew(void);
153 static void ttyread(void);
154 static void ttyresize(int, int);
155 static void ttywrite(const char *, size_t);
156
157 static void xclear(int, int, int, int);
158 static void xcursor(int);
159 static void xinit(void);
160 static void xloadcols(void);
161
162 static void expose(XEvent *);
163 static char* kmap(KeySym);
164 static void kpress(XEvent *);
165 static void resize(XEvent *);
166
167 static void (*handler[LASTEvent])(XEvent *) = {
168 [KeyPress] = kpress,
169 [Expose] = expose,
170 [ConfigureNotify] = resize
171 };
172
173 /* Globals */
174 static DC dc;
175 static XWindow xw;
176 static Term term;
177 static CSIEscape escseq;
178 static int cmdfd;
179 static pid_t pid;
180 static int running;
181
182 #ifdef DEBUG
183 void
184 tdump(void) {
185 int row, col;
186 Glyph c;
187
188 for(row = 0; row < term.row; row++) {
189 for(col = 0; col < term.col; col++) {
190 if(col == term.c.x && row == term.c.y)
191 putchar('#');
192 else {
193 c = term.line[row][col];
194 putchar(c.state & GLYPH_SET ? c.c : '.');
195 }
196 }
197 putchar('\n');
198 }
199 }
200 #endif
201
202 void
203 die(const char *errstr, ...) {
204 va_list ap;
205
206 va_start(ap, errstr);
207 vfprintf(stderr, errstr, ap);
208 va_end(ap);
209 exit(EXIT_FAILURE);
210 }
211
212 void
213 execsh(void) {
214 char *args[3] = {getenv("SHELL"), "-i", NULL};
215 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
216 putenv("TERM=" TNAME);
217 execvp(args[0], args);
218 }
219
220 void
221 xbell(void) { /* visual bell */
222 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
223 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
224 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
225 /* usleep(30000); */
226 draw(SCREEN_REDRAW);
227 }
228
229 void
230 sigchld(int a) {
231 int stat = 0;
232 if(waitpid(pid, &stat, 0) < 0)
233 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
234 if(WIFEXITED(stat))
235 exit(WEXITSTATUS(stat));
236 else
237 exit(EXIT_FAILURE);
238 }
239
240 void
241 ttynew(void) {
242 int m, s;
243 char *pts;
244
245 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
246 die("openpt failed: %s\n", SERRNO);
247 if(grantpt(m) < 0)
248 die("grandpt failed: %s\n", SERRNO);
249 if(unlockpt(m) < 0)
250 die("unlockpt failed: %s\n", SERRNO);
251 if(!(pts = ptsname(m)))
252 die("ptsname failed: %s\n", SERRNO);
253 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
254 die("Couldn't open slave: %s\n", SERRNO);
255 fcntl(s, F_SETFL, O_NDELAY);
256 switch(pid = fork()) {
257 case -1:
258 die("fork failed\n");
259 break;
260 case 0:
261 setsid(); /* create a new process group */
262 dup2(s, STDIN_FILENO);
263 dup2(s, STDOUT_FILENO);
264 dup2(s, STDERR_FILENO);
265 if(ioctl(s, TIOCSCTTY, NULL) < 0)
266 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
267 execsh();
268 break;
269 default:
270 close(s);
271 cmdfd = m;
272 signal(SIGCHLD, sigchld);
273 }
274 }
275
276 void
277 dump(char c) {
278 static int col;
279 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
280 if(++col % 10 == 0)
281 fprintf(stderr, "\n");
282 }
283
284 void
285 ttyread(void) {
286 char buf[BUFSIZ] = {0};
287 int ret;
288
289 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
290 die("Couldn't read from shell: %s\n", SERRNO);
291 else
292 tputs(buf, ret);
293 }
294
295 void
296 ttywrite(const char *s, size_t n) {
297 if(write(cmdfd, s, n) == -1)
298 die("write error on tty: %s\n", SERRNO);
299 }
300
301 void
302 ttyresize(int x, int y) {
303 struct winsize w;
304
305 w.ws_row = term.row;
306 w.ws_col = term.col;
307 w.ws_xpixel = w.ws_ypixel = 0;
308 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
309 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
310 }
311
312 void
313 tcursor(int mode) {
314 static TCursor c;
315
316 if(mode == CURSOR_SAVE)
317 c = term.c;
318 else if(mode == CURSOR_LOAD)
319 term.c = c, tmoveto(c.x, c.y);
320 }
321
322 void
323 treset(void) {
324 term.c.attr.mode = ATTR_NULL;
325 term.c.attr.fg = DefaultFG;
326 term.c.attr.bg = DefaultBG;
327 term.c.x = term.c.y = 0;
328 term.hidec = 0;
329 term.top = 0, term.bot = term.row - 1;
330 term.mode = MODE_WRAP;
331 tclearregion(0, 0, term.col-1, term.row-1);
332 }
333
334 void
335 tnew(int col, int row) { /* screen size */
336 term.row = row, term.col = col;
337 term.top = 0, term.bot = term.row - 1;
338 /* mode */
339 term.mode = MODE_WRAP;
340 /* cursor */
341 term.c.attr.mode = ATTR_NULL;
342 term.c.attr.fg = DefaultFG;
343 term.c.attr.bg = DefaultBG;
344 term.c.x = term.c.y = 0;
345 term.hidec = 0;
346 /* allocate screen */
347 term.line = calloc(term.row, sizeof(Line));
348 for(row = 0 ; row < term.row; row++)
349 term.line[row] = calloc(term.col, sizeof(Glyph));
350 }
351
352 /* TODO: Replace with scrollup/scolldown */
353 void
354 tscroll(void) {
355 Line temp = term.line[term.top];
356 int i;
357
358 for(i = term.top; i < term.bot; i++)
359 term.line[i] = term.line[i+1];
360 memset(temp, 0, sizeof(Glyph) * term.col);
361 term.line[term.bot] = temp;
362 }
363
364 void
365 tscrolldown (int n) {
366 int i;
367 Line temp;
368
369 LIMIT(n, 0, term.bot-term.top+1);
370
371 for(i = 0; i < n; i++)
372 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
373
374 for(i = term.bot; i >= term.top+n; i--) {
375 temp = term.line[i];
376 term.line[i] = term.line[i-n];
377 term.line[i-n] = temp;
378 }
379 }
380
381 void
382 tscrollup (int n) {
383 int i;
384 Line temp;
385 LIMIT(n, 0, term.bot-term.top+1);
386
387 for(i = 0; i < n; i++)
388 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
389
390 for(i = term.top; i <= term.bot-n; i++) {
391 temp = term.line[i];
392 term.line[i] = term.line[i+n];
393 term.line[i+n] = temp;
394 }
395 }
396
397 void
398 tnewline(void) {
399 int y = term.c.y + 1;
400 if(y > term.bot)
401 tscroll(), y = term.bot;
402 tmoveto(0, y);
403 }
404
405 void
406 csiparse(void) {
407 /* int noarg = 1; */
408 char *p = escseq.buf;
409
410 escseq.narg = 0;
411 if(*p == '?')
412 escseq.priv = 1, p++;
413
414 while(p < escseq.buf+escseq.len) {
415 while(isdigit(*p)) {
416 escseq.arg[escseq.narg] *= 10;
417 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
418 }
419 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
420 escseq.narg++, p++;
421 else {
422 escseq.mode = *p;
423 escseq.narg++;
424 return;
425 }
426 }
427 }
428
429 void
430 tmoveto(int x, int y) {
431 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
432 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
433 }
434
435 void
436 tmovecursor(int dir) {
437 int xf = term.c.x, yf = term.c.y;
438
439 switch(dir) {
440 case CURSOR_UP:
441 yf--;
442 break;
443 case CURSOR_DOWN:
444 yf++;
445 break;
446 case CURSOR_LEFT:
447 xf--;
448 if(term.mode & MODE_WRAP && xf < 0) {
449 xf = term.col-1, yf--;
450 if(yf < term.top)
451 yf = term.top, xf = 0;
452 }
453 break;
454 case CURSOR_RIGHT:
455 xf++;
456 if(term.mode & MODE_WRAP && xf >= term.col) {
457 xf = 0, yf++;
458 if(yf > term.bot)
459 yf = term.bot, tscroll();
460 }
461 break;
462 }
463 tmoveto(xf, yf);
464 }
465
466 void
467 tsetchar(char c) {
468 term.line[term.c.y][term.c.x] = term.c.attr;
469 term.line[term.c.y][term.c.x].c = c;
470 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
471 }
472
473 void
474 tclearregion(int x1, int y1, int x2, int y2) {
475 int y, temp;
476
477 if(x1 > x2)
478 temp = x1, x1 = x2, x2 = temp;
479 if(y1 > y2)
480 temp = y1, y1 = y2, y2 = temp;
481
482 LIMIT(x1, 0, term.col-1);
483 LIMIT(x2, 0, term.col-1);
484 LIMIT(y1, 0, term.row-1);
485 LIMIT(y2, 0, term.row-1);
486
487 for(y = y1; y <= y2; y++)
488 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
489 }
490
491 void
492 tdeletechar(int n) {
493 int src = term.c.x + n;
494 int dst = term.c.x;
495 int size = term.col - src;
496
497 if(src >= term.col) {
498 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
499 return;
500 }
501 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
502 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
503 }
504
505 void
506 tinsertblank(int n) {
507 int src = term.c.x;
508 int dst = src + n;
509 int size = term.col - n - src;
510
511 if(dst >= term.col) {
512 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
513 return;
514 }
515 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
516 tclearregion(src, term.c.y, dst, term.c.y);
517 }
518
519 void
520 tinsertblankline(int n) {
521 int i;
522 Line blank;
523 int bot = term.bot;
524
525 if(term.c.y > term.bot)
526 bot = term.row - 1;
527 else if(term.c.y < term.top)
528 bot = term.top - 1;
529 if(term.c.y + n >= bot) {
530 tclearregion(0, term.c.y, term.col-1, bot);
531 return;
532 }
533 for(i = bot; i >= term.c.y+n; i--) {
534 /* swap deleted line <-> blanked line */
535 blank = term.line[i];
536 term.line[i] = term.line[i-n];
537 term.line[i-n] = blank;
538 /* blank it */
539 memset(blank, 0, term.col * sizeof(Glyph));
540 }
541 }
542
543 void
544 tdeleteline(int n) {
545 int i;
546 Line blank;
547 int bot = term.bot;
548
549 if(term.c.y > term.bot)
550 bot = term.row - 1;
551 else if(term.c.y < term.top)
552 bot = term.top - 1;
553 if(term.c.y + n >= bot) {
554 tclearregion(0, term.c.y, term.col-1, bot);
555 return;
556 }
557 for(i = term.c.y; i <= bot-n; i++) {
558 /* swap deleted line <-> blanked line */
559 blank = term.line[i];
560 term.line[i] = term.line[i+n];
561 term.line[i+n] = blank;
562 /* blank it */
563 memset(blank, 0, term.col * sizeof(Glyph));
564 }
565 }
566
567 void
568 tsetattr(int *attr, int l) {
569 int i;
570
571 for(i = 0; i < l; i++) {
572 switch(attr[i]) {
573 case 0:
574 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
575 term.c.attr.fg = DefaultFG;
576 term.c.attr.bg = DefaultBG;
577 break;
578 case 1:
579 term.c.attr.mode |= ATTR_BOLD;
580 break;
581 case 4:
582 term.c.attr.mode |= ATTR_UNDERLINE;
583 break;
584 case 7:
585 term.c.attr.mode |= ATTR_REVERSE;
586 break;
587 case 22:
588 term.c.attr.mode &= ~ATTR_BOLD;
589 break;
590 case 24:
591 term.c.attr.mode &= ~ATTR_UNDERLINE;
592 break;
593 case 27:
594 term.c.attr.mode &= ~ATTR_REVERSE;
595 break;
596 case 38:
597 if (i + 2 < l && attr[i + 1] == 5) {
598 i += 2;
599 if (BETWEEN(attr[i], 0, 255))
600 term.c.attr.fg = attr[i];
601 else
602 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
603 }
604 else
605 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
606 break;
607 case 39:
608 term.c.attr.fg = DefaultFG;
609 break;
610 case 48:
611 if (i + 2 < l && attr[i + 1] == 5) {
612 i += 2;
613 if (BETWEEN(attr[i], 0, 255))
614 term.c.attr.bg = attr[i];
615 else
616 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
617 }
618 else
619 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
620 break;
621 case 49:
622 term.c.attr.bg = DefaultBG;
623 break;
624 default:
625 if(BETWEEN(attr[i], 30, 37))
626 term.c.attr.fg = attr[i] - 30;
627 else if(BETWEEN(attr[i], 40, 47))
628 term.c.attr.bg = attr[i] - 40;
629 else if(BETWEEN(attr[i], 90, 97))
630 term.c.attr.fg = attr[i] - 90 + 8;
631 else if(BETWEEN(attr[i], 100, 107))
632 term.c.attr.fg = attr[i] - 100 + 8;
633 else
634 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
635 break;
636 }
637 }
638 }
639
640 void
641 tsetscroll(int t, int b) {
642 int temp;
643
644 LIMIT(t, 0, term.row-1);
645 LIMIT(b, 0, term.row-1);
646 if(t > b) {
647 temp = t;
648 t = b;
649 b = temp;
650 }
651 term.top = t;
652 term.bot = b;
653 }
654
655 void
656 csihandle(void) {
657 switch(escseq.mode) {
658 default:
659 unknown:
660 printf("erresc: unknown csi ");
661 csidump();
662 /* die(""); */
663 break;
664 case '@': /* ICH -- Insert <n> blank char */
665 DEFAULT(escseq.arg[0], 1);
666 tinsertblank(escseq.arg[0]);
667 break;
668 case 'A': /* CUU -- Cursor <n> Up */
669 case 'e':
670 DEFAULT(escseq.arg[0], 1);
671 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
672 break;
673 case 'B': /* CUD -- Cursor <n> Down */
674 DEFAULT(escseq.arg[0], 1);
675 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
676 break;
677 case 'C': /* CUF -- Cursor <n> Forward */
678 case 'a':
679 DEFAULT(escseq.arg[0], 1);
680 tmoveto(term.c.x+escseq.arg[0], term.c.y);
681 break;
682 case 'D': /* CUB -- Cursor <n> Backward */
683 DEFAULT(escseq.arg[0], 1);
684 tmoveto(term.c.x-escseq.arg[0], term.c.y);
685 break;
686 case 'E': /* CNL -- Cursor <n> Down and first col */
687 DEFAULT(escseq.arg[0], 1);
688 tmoveto(0, term.c.y+escseq.arg[0]);
689 break;
690 case 'F': /* CPL -- Cursor <n> Up and first col */
691 DEFAULT(escseq.arg[0], 1);
692 tmoveto(0, term.c.y-escseq.arg[0]);
693 break;
694 case 'G': /* CHA -- Move to <col> */
695 case '`': /* XXX: HPA -- same? */
696 DEFAULT(escseq.arg[0], 1);
697 tmoveto(escseq.arg[0]-1, term.c.y);
698 break;
699 case 'H': /* CUP -- Move to <row> <col> */
700 case 'f': /* XXX: HVP -- same? */
701 DEFAULT(escseq.arg[0], 1);
702 DEFAULT(escseq.arg[1], 1);
703 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
704 break;
705 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
706 case 'J': /* ED -- Clear screen */
707 switch(escseq.arg[0]) {
708 case 0: /* below */
709 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
710 break;
711 case 1: /* above */
712 tclearregion(0, 0, term.c.x, term.c.y);
713 break;
714 case 2: /* all */
715 tclearregion(0, 0, term.col-1, term.row-1);
716 break;
717 case 3: /* XXX: erase saved lines (xterm) */
718 default:
719 goto unknown;
720 }
721 break;
722 case 'K': /* EL -- Clear line */
723 switch(escseq.arg[0]) {
724 case 0: /* right */
725 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
726 break;
727 case 1: /* left */
728 tclearregion(0, term.c.y, term.c.x, term.c.y);
729 break;
730 case 2: /* all */
731 tclearregion(0, term.c.y, term.col-1, term.c.y);
732 break;
733 }
734 break;
735 case 'S': /* SU -- Scroll <n> line up */
736 DEFAULT(escseq.arg[0], 1);
737 tscrollup(escseq.arg[0]);
738 break;
739 case 'T': /* SD -- Scroll <n> line down */
740 DEFAULT(escseq.arg[0], 1);
741 tscrolldown(escseq.arg[0]);
742 break;
743 case 'L': /* IL -- Insert <n> blank lines */
744 DEFAULT(escseq.arg[0], 1);
745 tinsertblankline(escseq.arg[0]);
746 break;
747 case 'l': /* RM -- Reset Mode */
748 if(escseq.priv) {
749 switch(escseq.arg[0]) {
750 case 1:
751 term.mode &= ~MODE_APPKEYPAD;
752 break;
753 case 7:
754 term.mode &= ~MODE_WRAP;
755 break;
756 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
757 break;
758 case 25:
759 term.hidec = 1;
760 break;
761 case 1048: /* XXX: no alt. screen to erase/save */
762 case 1049:
763 tcursor(CURSOR_LOAD);
764 tclearregion(0, 0, term.col-1, term.row-1);
765 break;
766 default:
767 goto unknown;
768 }
769 } else {
770 switch(escseq.arg[0]) {
771 case 4:
772 term.mode &= ~MODE_INSERT;
773 break;
774 default:
775 goto unknown;
776 }
777 }
778 break;
779 case 'M': /* DL -- Delete <n> lines */
780 DEFAULT(escseq.arg[0], 1);
781 tdeleteline(escseq.arg[0]);
782 break;
783 case 'X': /* ECH -- Erase <n> char */
784 DEFAULT(escseq.arg[0], 1);
785 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
786 break;
787 case 'P': /* DCH -- Delete <n> char */
788 DEFAULT(escseq.arg[0], 1);
789 tdeletechar(escseq.arg[0]);
790 break;
791 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
792 case 'd': /* VPA -- Move to <row> */
793 DEFAULT(escseq.arg[0], 1);
794 tmoveto(term.c.x, escseq.arg[0]-1);
795 break;
796 case 'h': /* SM -- Set terminal mode */
797 if(escseq.priv) {
798 switch(escseq.arg[0]) {
799 case 1:
800 term.mode |= MODE_APPKEYPAD;
801 break;
802 case 7:
803 term.mode |= MODE_WRAP;
804 break;
805 case 12: /* att610 -- Start blinking cursor (IGNORED) */
806 break;
807 case 25:
808 term.hidec = 0;
809 break;
810 case 1048:
811 case 1049: /* XXX: no alt. screen to erase/save */
812 tcursor(CURSOR_SAVE);
813 tclearregion(0, 0, term.col-1, term.row-1);
814 break;
815 default: goto unknown;
816 }
817 } else {
818 switch(escseq.arg[0]) {
819 case 4:
820 term.mode |= MODE_INSERT;
821 break;
822 default: goto unknown;
823 }
824 };
825 break;
826 case 'm': /* SGR -- Terminal attribute (color) */
827 tsetattr(escseq.arg, escseq.narg);
828 break;
829 case 'r': /* DECSTBM -- Set Scrolling Region */
830 if(escseq.priv)
831 goto unknown;
832 else {
833 DEFAULT(escseq.arg[0], 1);
834 DEFAULT(escseq.arg[1], term.row);
835 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
836 }
837 break;
838 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
839 tcursor(CURSOR_SAVE);
840 break;
841 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
842 tcursor(CURSOR_LOAD);
843 break;
844 }
845 }
846
847 void
848 csidump(void) {
849 int i;
850 printf("ESC [ %s", escseq.priv ? "? " : "");
851 if(escseq.narg)
852 for(i = 0; i < escseq.narg; i++)
853 printf("%d ", escseq.arg[i]);
854 if(escseq.mode)
855 putchar(escseq.mode);
856 putchar('\n');
857 }
858
859 void
860 csireset(void) {
861 memset(&escseq, 0, sizeof(escseq));
862 }
863
864 void
865 tputtab(void) {
866 int space = TAB - term.c.x % TAB;
867
868 if(term.c.x + space >= term.col)
869 space--;
870
871 for(; space > 0; space--)
872 tmovecursor(CURSOR_RIGHT);
873 }
874
875 void
876 tputc(char c) {
877 if(term.esc & ESC_START) {
878 if(term.esc & ESC_CSI) {
879 escseq.buf[escseq.len++] = c;
880 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
881 term.esc = 0;
882 csiparse(), csihandle();
883 }
884 } else if(term.esc & ESC_OSC) {
885 if(c == ';') {
886 term.titlelen = 0;
887 term.esc = ESC_START | ESC_TITLE;
888 }
889 } else if(term.esc & ESC_TITLE) {
890 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
891 term.esc = 0;
892 term.title[term.titlelen] = '\0';
893 XStoreName(xw.dis, xw.win, term.title);
894 } else {
895 term.title[term.titlelen++] = c;
896 }
897 } else if(term.esc & ESC_ALTCHARSET) {
898 switch(c) {
899 case '0': /* Line drawing crap */
900 term.c.attr.mode |= ATTR_GFX;
901 break;
902 case 'B': /* Back to regular text */
903 term.c.attr.mode &= ~ATTR_GFX;
904 break;
905 default:
906 printf("esc unhandled charset: ESC ( %c\n", c);
907 }
908 term.esc = 0;
909 } else {
910 switch(c) {
911 case '[':
912 term.esc |= ESC_CSI;
913 break;
914 case ']':
915 term.esc |= ESC_OSC;
916 break;
917 case '(':
918 term.esc |= ESC_ALTCHARSET;
919 break;
920 case 'A':
921 tmoveto(term.c.x, term.c.y-1);
922 term.esc = 0;
923 break;
924 case 'B':
925 tmoveto(term.c.x, term.c.y+1);
926 term.esc = 0;
927 break;
928 case 'C':
929 tmoveto(term.c.x+1, term.c.y);
930 term.esc = 0;
931 break;
932 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
933 tmoveto(term.c.x-1, term.c.y);
934 term.esc = 0;
935 break;
936 case 'E': /* NEL -- Next line */
937 tnewline();
938 term.esc = 0;
939 break;
940 case 'M': /* RI -- Reverse index */
941 if(term.c.y == term.top)
942 tscrolldown(1);
943 else
944 tmoveto(term.c.x, term.c.y-1);
945 term.esc = 0;
946 break;
947 case 'c': /* RIS -- Reset to inital state */
948 treset();
949 term.esc = 0;
950 break;
951 case '=': /* DECPAM */
952 term.mode |= MODE_APPKEYPAD;
953 term.esc = 0;
954 break;
955 case '>': /* DECPNM */
956 term.mode &= ~MODE_APPKEYPAD;
957 term.esc = 0;
958 break;
959 case '7':
960 tcursor(CURSOR_SAVE);
961 term.esc = 0;
962 break;
963 case '8':
964 tcursor(CURSOR_LOAD);
965 term.esc = 0;
966 break;
967 default:
968 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
969 term.esc = 0;
970 }
971 }
972 } else {
973 switch(c) {
974 case '\t':
975 tputtab();
976 break;
977 case '\b':
978 tmovecursor(CURSOR_LEFT);
979 break;
980 case '\r':
981 tmoveto(0, term.c.y);
982 break;
983 case '\n':
984 tnewline();
985 break;
986 case '\a':
987 xbell();
988 break;
989 case '\033':
990 csireset();
991 term.esc = ESC_START;
992 break;
993 default:
994 tsetchar(c);
995 tmovecursor(CURSOR_RIGHT);
996 break;
997 }
998 }
999 }
1000
1001 void
1002 tputs(char *s, int len) {
1003 for(; len > 0; len--)
1004 tputc(*s++);
1005 }
1006
1007 void
1008 tresize(int col, int row) {
1009 int i;
1010 Line *line;
1011 int minrow = MIN(row, term.row);
1012 int mincol = MIN(col, term.col);
1013
1014 if(col < 1 || row < 1)
1015 return;
1016 /* alloc */
1017 line = calloc(row, sizeof(Line));
1018 for(i = 0 ; i < row; i++)
1019 line[i] = calloc(col, sizeof(Glyph));
1020 /* copy */
1021 for(i = 0 ; i < minrow; i++)
1022 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
1023 /* free */
1024 for(i = 0; i < term.row; i++)
1025 free(term.line[i]);
1026 free(term.line);
1027
1028 LIMIT(term.c.x, 0, col-1);
1029 LIMIT(term.c.y, 0, row-1);
1030 LIMIT(term.top, 0, row-1);
1031 LIMIT(term.bot, 0, row-1);
1032
1033 term.bot = row-1;
1034 term.line = line;
1035 term.col = col, term.row = row;
1036 }
1037
1038 void
1039 xloadcols(void) {
1040 int i, r, g, b;
1041 XColor color;
1042 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1043 unsigned long white = WhitePixel(xw.dis, xw.scr);
1044
1045 for(i = 0; i < 16; i++) {
1046 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1047 dc.col[i] = white;
1048 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1049 } else
1050 dc.col[i] = color.pixel;
1051 }
1052
1053 /* same colors as xterm */
1054 for(r = 0; r < 6; r++)
1055 for(g = 0; g < 6; g++)
1056 for(b = 0; b < 6; b++) {
1057 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1058 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1059 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1060 if (!XAllocColor(xw.dis, cmap, &color)) {
1061 dc.col[i] = white;
1062 fprintf(stderr, "Could not allocate color %d\n", i);
1063 } else
1064 dc.col[i] = color.pixel;
1065 i++;
1066 }
1067
1068 for(r = 0; r < 24; r++, i++) {
1069 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1070 if (!XAllocColor(xw.dis, cmap, &color)) {
1071 dc.col[i] = white;
1072 fprintf(stderr, "Could not allocate color %d\n", i);
1073 } else
1074 dc.col[i] = color.pixel;
1075 }
1076 }
1077
1078 void
1079 xclear(int x1, int y1, int x2, int y2) {
1080 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1081 XFillRectangle(xw.dis, xw.buf, dc.gc,
1082 x1 * xw.cw, y1 * xw.ch,
1083 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1084 }
1085
1086 void
1087 xhints(void)
1088 {
1089 XClassHint class = {TNAME, TNAME};
1090 XWMHints wm = {.flags = InputHint, .input = 1};
1091 XSizeHints size = {
1092 .flags = PSize | PResizeInc | PBaseSize,
1093 .height = xw.h,
1094 .width = xw.w,
1095 .height_inc = xw.ch,
1096 .width_inc = xw.cw,
1097 .base_height = 2*BORDER,
1098 .base_width = 2*BORDER,
1099 };
1100 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1101 }
1102
1103 void
1104 xinit(void) {
1105 xw.dis = XOpenDisplay(NULL);
1106 xw.scr = XDefaultScreen(xw.dis);
1107 if(!xw.dis)
1108 die("Can't open display\n");
1109
1110 /* font */
1111 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1112 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1113
1114 /* XXX: Assuming same size for bold font */
1115 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1116 xw.ch = dc.font->ascent + dc.font->descent;
1117
1118 /* colors */
1119 xloadcols();
1120
1121 term.c.attr.fg = DefaultFG;
1122 term.c.attr.bg = DefaultBG;
1123 term.c.attr.mode = ATTR_NULL;
1124 /* windows */
1125 xw.h = term.row * xw.ch + 2*BORDER;
1126 xw.w = term.col * xw.cw + 2*BORDER;
1127 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1128 xw.w, xw.h, 0,
1129 dc.col[DefaultBG],
1130 dc.col[DefaultBG]);
1131 xw.bufw = xw.w - 2*BORDER;
1132 xw.bufh = xw.h - 2*BORDER;
1133 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1134 /* gc */
1135 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1136 XMapWindow(xw.dis, xw.win);
1137 xhints();
1138 XStoreName(xw.dis, xw.win, "st");
1139 XSync(xw.dis, 0);
1140 }
1141
1142 void
1143 xdraws(char *s, Glyph base, int x, int y, int len) {
1144 unsigned long xfg, xbg;
1145 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1146 int i;
1147
1148 if(base.mode & ATTR_REVERSE)
1149 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1150 else
1151 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1152
1153 XSetBackground(xw.dis, dc.gc, xbg);
1154 XSetForeground(xw.dis, dc.gc, xfg);
1155
1156 if(base.mode & ATTR_GFX)
1157 for(i = 0; i < len; i++)
1158 s[i] = gfx[(int)s[i]];
1159
1160 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1161 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1162
1163 if(base.mode & ATTR_UNDERLINE)
1164 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1165 }
1166
1167 void
1168 xcursor(int mode) {
1169 static int oldx = 0;
1170 static int oldy = 0;
1171 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1172
1173 LIMIT(oldx, 0, term.col-1);
1174 LIMIT(oldy, 0, term.row-1);
1175
1176 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1177 g.c = term.line[term.c.y][term.c.x].c;
1178
1179 /* remove the old cursor */
1180 if(term.line[oldy][oldx].state & GLYPH_SET)
1181 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1182 else
1183 xclear(oldx, oldy, oldx, oldy);
1184
1185 /* draw the new one */
1186 if(mode == CURSOR_DRAW) {
1187 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1188 oldx = term.c.x, oldy = term.c.y;
1189 }
1190 }
1191
1192 #ifdef DEBUG
1193 /* basic drawing routines */
1194 void
1195 xdrawc(int x, int y, Glyph g) {
1196 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1197 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1198 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1199 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1200 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1201 }
1202
1203 void
1204 draw(int dummy) {
1205 int x, y;
1206
1207 xclear(0, 0, term.col-1, term.row-1);
1208 for(y = 0; y < term.row; y++)
1209 for(x = 0; x < term.col; x++)
1210 if(term.line[y][x].state & GLYPH_SET)
1211 xdrawc(x, y, term.line[y][x]);
1212
1213 if(!term.hidec)
1214 xcursor(CURSOR_DRAW);
1215 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1216 XFlush(xw.dis);
1217 }
1218
1219 #else
1220 /* optimized drawing routine */
1221 void
1222 draw(int redraw_all) {
1223 int i, x, y, ox;
1224 Glyph base, new;
1225 char buf[DRAW_BUF_SIZ];
1226
1227 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1228 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1229 for(y = 0; y < term.row; y++) {
1230 base = term.line[y][0];
1231 i = ox = 0;
1232 for(x = 0; x < term.col; x++) {
1233 new = term.line[y][x];
1234 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1235 buf[i++] = new.c;
1236 else {
1237 xdraws(buf, base, ox, y, i);
1238 buf[0] = new.c;
1239 i = 1;
1240 ox = x;
1241 base = new;
1242 }
1243 }
1244 xdraws(buf, base, ox, y, i);
1245 }
1246 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1247 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1248 XFlush(xw.dis);
1249 }
1250
1251 #endif
1252
1253 void
1254 expose(XEvent *ev) {
1255 draw(SCREEN_REDRAW);
1256 }
1257
1258 char*
1259 kmap(KeySym k) {
1260 int i;
1261 for(i = 0; i < LEN(key); i++)
1262 if(key[i].k == k)
1263 return (char*)key[i].s;
1264 return NULL;
1265 }
1266
1267 void
1268 kpress(XEvent *ev) {
1269 XKeyEvent *e = &ev->xkey;
1270 KeySym ksym;
1271 char buf[32];
1272 char *customkey;
1273 int len;
1274 int meta;
1275 int shift;
1276
1277 meta = e->state & Mod1Mask;
1278 shift = e->state & ShiftMask;
1279 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1280
1281 if((customkey = kmap(ksym)))
1282 ttywrite(customkey, strlen(customkey));
1283 else if(len > 0) {
1284 buf[sizeof(buf)-1] = '\0';
1285 if(meta && len == 1)
1286 ttywrite("\033", 1);
1287 ttywrite(buf, len);
1288 } else
1289 switch(ksym) {
1290 case XK_Up:
1291 case XK_Down:
1292 case XK_Left:
1293 case XK_Right:
1294 sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1295 ttywrite(buf, 3);
1296 break;
1297 case XK_Insert:
1298 if(shift)
1299 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1300 break;
1301 default:
1302 fprintf(stderr, "errkey: %d\n", (int)ksym);
1303 break;
1304 }
1305 }
1306
1307 void
1308 resize(XEvent *e) {
1309 int col, row;
1310
1311 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1312 return;
1313
1314 xw.w = e->xconfigure.width;
1315 xw.h = e->xconfigure.height;
1316 xw.bufw = xw.w - 2*BORDER;
1317 xw.bufh = xw.h - 2*BORDER;
1318 col = xw.bufw / xw.cw;
1319 row = xw.bufh / xw.ch;
1320 tresize(col, row);
1321 ttyresize(col, row);
1322 XFreePixmap(xw.dis, xw.buf);
1323 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1324 draw(SCREEN_REDRAW);
1325 }
1326
1327 void
1328 run(void) {
1329 XEvent ev;
1330 fd_set rfd;
1331 int xfd = XConnectionNumber(xw.dis);
1332
1333 running = 1;
1334 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1335 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1336
1337 while(running) {
1338 FD_ZERO(&rfd);
1339 FD_SET(cmdfd, &rfd);
1340 FD_SET(xfd, &rfd);
1341 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1342 if(errno == EINTR)
1343 continue;
1344 die("select failed: %s\n", SERRNO);
1345 }
1346 if(FD_ISSET(cmdfd, &rfd)) {
1347 ttyread();
1348 draw(SCREEN_UPDATE);
1349 }
1350 while(XPending(xw.dis)) {
1351 XNextEvent(xw.dis, &ev);
1352 if(handler[ev.type])
1353 (handler[ev.type])(&ev);
1354 }
1355 }
1356 }
1357
1358 int
1359 main(int argc, char *argv[]) {
1360 if(argc == 2 && !strncmp("-v", argv[1], 3))
1361 die("st-" VERSION ", © 2009 st engineers\n");
1362 else if(argc != 1)
1363 die("usage: st [-v]\n");
1364 setlocale(LC_CTYPE, "");
1365 tnew(80, 24);
1366 ttynew();
1367 xinit();
1368 run();
1369 return 0;
1370 }