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36ff43c1854a52fc5f78308ae36d0a391f90ac33
[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 #if defined(LINUX)
24 #include <pty.h>
25 #elif defined(OPENBSD)
26 #include <util.h>
27 #elif defined(FREEBSD)
28 #include <libutil.h>
29 #endif
30
31 /* Arbitrary sizes */
32 #define ESC_TITLE_SIZ 256
33 #define ESC_BUF_SIZ 256
34 #define ESC_ARG_SIZ 16
35 #define DRAW_BUF_SIZ 1024
36
37 #define SERRNO strerror(errno)
38 #define MIN(a, b) ((a) < (b) ? (a) : (b))
39 #define MAX(a, b) ((a) < (b) ? (b) : (a))
40 #define LEN(a) (sizeof(a) / sizeof(a[0]))
41 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
42 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
43 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
44 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
45 #define IS_SET(flag) (term.mode & (flag))
46
47 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
48 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
49 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
50 CURSOR_SAVE, CURSOR_LOAD };
51 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
52 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
53 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
54 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
55 enum { SCREEN_UPDATE, SCREEN_REDRAW };
56
57 typedef struct {
58 char c; /* character code */
59 char mode; /* attribute flags */
60 int fg; /* foreground */
61 int bg; /* background */
62 char state; /* state flags */
63 } Glyph;
64
65 typedef Glyph* Line;
66
67 typedef struct {
68 Glyph attr; /* current char attributes */
69 int x;
70 int y;
71 char state;
72 } TCursor;
73
74 /* CSI Escape sequence structs */
75 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
76 typedef struct {
77 char buf[ESC_BUF_SIZ]; /* raw string */
78 int len; /* raw string length */
79 char priv;
80 int arg[ESC_ARG_SIZ];
81 int narg; /* nb of args */
82 char mode;
83 } CSIEscape;
84
85 /* Internal representation of the screen */
86 typedef struct {
87 int row; /* nb row */
88 int col; /* nb col */
89 Line* line; /* screen */
90 TCursor c; /* cursor */
91 int top; /* top scroll limit */
92 int bot; /* bottom scroll limit */
93 int mode; /* terminal mode flags */
94 int esc; /* escape state flags */
95 char title[ESC_TITLE_SIZ];
96 int titlelen;
97 } Term;
98
99 /* Purely graphic info */
100 typedef struct {
101 Display* dis;
102 Window win;
103 Pixmap buf;
104 int scr;
105 int w; /* window width */
106 int h; /* window height */
107 int bufw; /* pixmap width */
108 int bufh; /* pixmap height */
109 int ch; /* char height */
110 int cw; /* char width */
111 } XWindow;
112
113 typedef struct {
114 KeySym k;
115 char s[ESC_BUF_SIZ];
116 } Key;
117
118 /* Drawing Context */
119 typedef struct {
120 unsigned long col[256];
121 XFontStruct* font;
122 XFontStruct* bfont;
123 GC gc;
124 } DC;
125
126 #include "config.h"
127
128 static void die(const char *errstr, ...);
129 static void draw(int);
130 static void execsh(void);
131 static void sigchld(int);
132 static void run(void);
133
134 static void csidump(void);
135 static void csihandle(void);
136 static void csiparse(void);
137 static void csireset(void);
138
139 static void tclearregion(int, int, int, int);
140 static void tcursor(int);
141 static void tdeletechar(int);
142 static void tdeleteline(int);
143 static void tinsertblank(int);
144 static void tinsertblankline(int);
145 static void tmoveto(int, int);
146 static void tnew(int, int);
147 static void tnewline(void);
148 static void tputtab(void);
149 static void tputc(char);
150 static void tputs(char*, int);
151 static void treset(void);
152 static void tresize(int, int);
153 static void tscrollup(int);
154 static void tscrolldown(int);
155 static void tsetattr(int*, int);
156 static void tsetchar(char);
157 static void tsetscroll(int, int);
158
159 static void ttynew(void);
160 static void ttyread(void);
161 static void ttyresize(int, int);
162 static void ttywrite(const char *, size_t);
163
164 static void xbell(void);
165 static void xdraws(char *, Glyph, int, int, int);
166 static void xhints(void);
167 static void xclear(int, int, int, int);
168 static void xdrawcursor(void);
169 static void xinit(void);
170 static void xloadcols(void);
171
172 static void expose(XEvent *);
173 static char* kmap(KeySym);
174 static void kpress(XEvent *);
175 static void resize(XEvent *);
176
177 static void (*handler[LASTEvent])(XEvent *) = {
178 [KeyPress] = kpress,
179 [Expose] = expose,
180 [ConfigureNotify] = resize
181 };
182
183 /* Globals */
184 static DC dc;
185 static XWindow xw;
186 static Term term;
187 static CSIEscape escseq;
188 static int cmdfd;
189 static pid_t pid;
190 static int running;
191
192 #ifdef DEBUG
193 void
194 tdump(void) {
195 int row, col;
196 Glyph c;
197
198 for(row = 0; row < term.row; row++) {
199 for(col = 0; col < term.col; col++) {
200 if(col == term.c.x && row == term.c.y)
201 putchar('#');
202 else {
203 c = term.line[row][col];
204 putchar(c.state & GLYPH_SET ? c.c : '.');
205 }
206 }
207 putchar('\n');
208 }
209 }
210 #endif
211
212 void
213 die(const char *errstr, ...) {
214 va_list ap;
215
216 va_start(ap, errstr);
217 vfprintf(stderr, errstr, ap);
218 va_end(ap);
219 exit(EXIT_FAILURE);
220 }
221
222 void
223 execsh(void) {
224 char *args[3] = {getenv("SHELL"), "-i", NULL};
225 DEFAULT(args[0], "/bin/sh"); /* if getenv() failed */
226 putenv("TERM=" TNAME);
227 execvp(args[0], args);
228 }
229
230 void
231 xbell(void) {
232 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
233 XFillRectangle(xw.dis, xw.win, dc.gc, BORDER, BORDER, xw.bufw, xw.bufh);
234 XFlush(xw.dis);
235 usleep(BellTime);
236 draw(SCREEN_REDRAW);
237 }
238
239 void
240 sigchld(int a) {
241 int stat = 0;
242 if(waitpid(pid, &stat, 0) < 0)
243 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
244 if(WIFEXITED(stat))
245 exit(WEXITSTATUS(stat));
246 else
247 exit(EXIT_FAILURE);
248 }
249
250 void
251 ttynew(void) {
252 int m, s;
253
254 /* seems to work fine on linux, openbsd and freebsd */
255 struct winsize w = {term.row, term.col, 0, 0};
256 if(openpty(&m, &s, NULL, NULL, &w) < 0)
257 die("openpty failed: %s\n", SERRNO);
258
259 switch(pid = fork()) {
260 case -1:
261 die("fork failed\n");
262 break;
263 case 0:
264 setsid(); /* create a new process group */
265 dup2(s, STDIN_FILENO);
266 dup2(s, STDOUT_FILENO);
267 dup2(s, STDERR_FILENO);
268 if(ioctl(s, TIOCSCTTY, NULL) < 0)
269 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
270 close(s);
271 close(m);
272 execsh();
273 break;
274 default:
275 close(s);
276 cmdfd = m;
277 signal(SIGCHLD, sigchld);
278 }
279 }
280
281 void
282 dump(char c) {
283 static int col;
284 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
285 if(++col % 10 == 0)
286 fprintf(stderr, "\n");
287 }
288
289 void
290 ttyread(void) {
291 char buf[BUFSIZ] = {0};
292 int ret;
293
294 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
295 die("Couldn't read from shell: %s\n", SERRNO);
296 else
297 tputs(buf, ret);
298 }
299
300 void
301 ttywrite(const char *s, size_t n) {
302 if(write(cmdfd, s, n) == -1)
303 die("write error on tty: %s\n", SERRNO);
304 }
305
306 void
307 ttyresize(int x, int y) {
308 struct winsize w;
309
310 w.ws_row = term.row;
311 w.ws_col = term.col;
312 w.ws_xpixel = w.ws_ypixel = 0;
313 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
314 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
315 }
316
317 void
318 tcursor(int mode) {
319 static TCursor c;
320
321 if(mode == CURSOR_SAVE)
322 c = term.c;
323 else if(mode == CURSOR_LOAD)
324 term.c = c, tmoveto(c.x, c.y);
325 }
326
327 void
328 treset(void) {
329 term.c = (TCursor){{
330 .mode = ATTR_NULL,
331 .fg = DefaultFG,
332 .bg = DefaultBG
333 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
334
335 term.top = 0, term.bot = term.row - 1;
336 term.mode = MODE_WRAP;
337 tclearregion(0, 0, term.col-1, term.row-1);
338 }
339
340 void
341 tnew(int col, int row) {
342 /* set screen size */
343 term.row = row, term.col = col;
344 term.line = malloc(term.row * sizeof(Line));
345 for(row = 0 ; row < term.row; row++)
346 term.line[row] = malloc(term.col * sizeof(Glyph));
347 /* setup screen */
348 treset();
349 }
350
351 void
352 tscrolldown (int n) {
353 int i;
354 Line temp;
355
356 LIMIT(n, 0, term.bot-term.top+1);
357
358 for(i = 0; i < n; i++)
359 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
360
361 for(i = term.bot; i >= term.top+n; i--) {
362 temp = term.line[i];
363 term.line[i] = term.line[i-n];
364 term.line[i-n] = temp;
365 }
366 }
367
368 void
369 tscrollup (int n) {
370 int i;
371 Line temp;
372 LIMIT(n, 0, term.bot-term.top+1);
373
374 for(i = 0; i < n; i++)
375 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
376
377 for(i = term.top; i <= term.bot-n; i++) {
378 temp = term.line[i];
379 term.line[i] = term.line[i+n];
380 term.line[i+n] = temp;
381 }
382 }
383
384 void
385 tnewline(void) {
386 int y = term.c.y + 1;
387 if(y > term.bot)
388 tscrollup(1), y = term.bot;
389 tmoveto(0, y);
390 }
391
392 void
393 csiparse(void) {
394 /* int noarg = 1; */
395 char *p = escseq.buf;
396
397 escseq.narg = 0;
398 if(*p == '?')
399 escseq.priv = 1, p++;
400
401 while(p < escseq.buf+escseq.len) {
402 while(isdigit(*p)) {
403 escseq.arg[escseq.narg] *= 10;
404 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
405 }
406 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
407 escseq.narg++, p++;
408 else {
409 escseq.mode = *p;
410 escseq.narg++;
411 return;
412 }
413 }
414 }
415
416 void
417 tmoveto(int x, int y) {
418 LIMIT(x, 0, term.col-1);
419 LIMIT(y, 0, term.row-1);
420 term.c.state &= ~CURSOR_WRAPNEXT;
421 term.c.x = x;
422 term.c.y = y;
423 }
424
425 void
426 tsetchar(char c) {
427 term.line[term.c.y][term.c.x] = term.c.attr;
428 term.line[term.c.y][term.c.x].c = c;
429 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
430 }
431
432 void
433 tclearregion(int x1, int y1, int x2, int y2) {
434 int y, temp;
435
436 if(x1 > x2)
437 temp = x1, x1 = x2, x2 = temp;
438 if(y1 > y2)
439 temp = y1, y1 = y2, y2 = temp;
440
441 LIMIT(x1, 0, term.col-1);
442 LIMIT(x2, 0, term.col-1);
443 LIMIT(y1, 0, term.row-1);
444 LIMIT(y2, 0, term.row-1);
445
446 for(y = y1; y <= y2; y++)
447 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
448 }
449
450 void
451 tdeletechar(int n) {
452 int src = term.c.x + n;
453 int dst = term.c.x;
454 int size = term.col - src;
455
456 if(src >= term.col) {
457 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
458 return;
459 }
460 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
461 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
462 }
463
464 void
465 tinsertblank(int n) {
466 int src = term.c.x;
467 int dst = src + n;
468 int size = term.col - dst;
469
470 if(dst >= term.col) {
471 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
472 return;
473 }
474 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
475 tclearregion(src, term.c.y, dst - 1, term.c.y);
476 }
477
478 void
479 tinsertblankline(int n) {
480 int i;
481 Line blank;
482 int bot = term.bot;
483
484 if(term.c.y > term.bot)
485 bot = term.row - 1;
486 else if(term.c.y < term.top)
487 bot = term.top - 1;
488 if(term.c.y + n >= bot) {
489 tclearregion(0, term.c.y, term.col-1, bot);
490 return;
491 }
492 for(i = bot; i >= term.c.y+n; i--) {
493 /* swap deleted line <-> blanked line */
494 blank = term.line[i];
495 term.line[i] = term.line[i-n];
496 term.line[i-n] = blank;
497 /* blank it */
498 memset(blank, 0, term.col * sizeof(Glyph));
499 }
500 }
501
502 void
503 tdeleteline(int n) {
504 int i;
505 Line blank;
506 int bot = term.bot;
507
508 if(term.c.y > term.bot)
509 bot = term.row - 1;
510 else if(term.c.y < term.top)
511 bot = term.top - 1;
512 if(term.c.y + n >= bot) {
513 tclearregion(0, term.c.y, term.col-1, bot);
514 return;
515 }
516 for(i = term.c.y; i <= bot-n; i++) {
517 /* swap deleted line <-> blanked line */
518 blank = term.line[i];
519 term.line[i] = term.line[i+n];
520 term.line[i+n] = blank;
521 /* blank it */
522 memset(blank, 0, term.col * sizeof(Glyph));
523 }
524 }
525
526 void
527 tsetattr(int *attr, int l) {
528 int i;
529
530 for(i = 0; i < l; i++) {
531 switch(attr[i]) {
532 case 0:
533 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
534 term.c.attr.fg = DefaultFG;
535 term.c.attr.bg = DefaultBG;
536 break;
537 case 1:
538 term.c.attr.mode |= ATTR_BOLD;
539 break;
540 case 4:
541 term.c.attr.mode |= ATTR_UNDERLINE;
542 break;
543 case 7:
544 term.c.attr.mode |= ATTR_REVERSE;
545 break;
546 case 22:
547 term.c.attr.mode &= ~ATTR_BOLD;
548 break;
549 case 24:
550 term.c.attr.mode &= ~ATTR_UNDERLINE;
551 break;
552 case 27:
553 term.c.attr.mode &= ~ATTR_REVERSE;
554 break;
555 case 38:
556 if (i + 2 < l && attr[i + 1] == 5) {
557 i += 2;
558 if (BETWEEN(attr[i], 0, 255))
559 term.c.attr.fg = attr[i];
560 else
561 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
562 }
563 else
564 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
565 break;
566 case 39:
567 term.c.attr.fg = DefaultFG;
568 break;
569 case 48:
570 if (i + 2 < l && attr[i + 1] == 5) {
571 i += 2;
572 if (BETWEEN(attr[i], 0, 255))
573 term.c.attr.bg = attr[i];
574 else
575 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
576 }
577 else
578 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
579 break;
580 case 49:
581 term.c.attr.bg = DefaultBG;
582 break;
583 default:
584 if(BETWEEN(attr[i], 30, 37))
585 term.c.attr.fg = attr[i] - 30;
586 else if(BETWEEN(attr[i], 40, 47))
587 term.c.attr.bg = attr[i] - 40;
588 else if(BETWEEN(attr[i], 90, 97))
589 term.c.attr.fg = attr[i] - 90 + 8;
590 else if(BETWEEN(attr[i], 100, 107))
591 term.c.attr.fg = attr[i] - 100 + 8;
592 else
593 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
594 break;
595 }
596 }
597 }
598
599 void
600 tsetscroll(int t, int b) {
601 int temp;
602
603 LIMIT(t, 0, term.row-1);
604 LIMIT(b, 0, term.row-1);
605 if(t > b) {
606 temp = t;
607 t = b;
608 b = temp;
609 }
610 term.top = t;
611 term.bot = b;
612 }
613
614 void
615 csihandle(void) {
616 switch(escseq.mode) {
617 default:
618 unknown:
619 printf("erresc: unknown csi ");
620 csidump();
621 /* die(""); */
622 break;
623 case '@': /* ICH -- Insert <n> blank char */
624 DEFAULT(escseq.arg[0], 1);
625 tinsertblank(escseq.arg[0]);
626 break;
627 case 'A': /* CUU -- Cursor <n> Up */
628 case 'e':
629 DEFAULT(escseq.arg[0], 1);
630 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
631 break;
632 case 'B': /* CUD -- Cursor <n> Down */
633 DEFAULT(escseq.arg[0], 1);
634 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
635 break;
636 case 'C': /* CUF -- Cursor <n> Forward */
637 case 'a':
638 DEFAULT(escseq.arg[0], 1);
639 tmoveto(term.c.x+escseq.arg[0], term.c.y);
640 break;
641 case 'D': /* CUB -- Cursor <n> Backward */
642 DEFAULT(escseq.arg[0], 1);
643 tmoveto(term.c.x-escseq.arg[0], term.c.y);
644 break;
645 case 'E': /* CNL -- Cursor <n> Down and first col */
646 DEFAULT(escseq.arg[0], 1);
647 tmoveto(0, term.c.y+escseq.arg[0]);
648 break;
649 case 'F': /* CPL -- Cursor <n> Up and first col */
650 DEFAULT(escseq.arg[0], 1);
651 tmoveto(0, term.c.y-escseq.arg[0]);
652 break;
653 case 'G': /* CHA -- Move to <col> */
654 case '`': /* XXX: HPA -- same? */
655 DEFAULT(escseq.arg[0], 1);
656 tmoveto(escseq.arg[0]-1, term.c.y);
657 break;
658 case 'H': /* CUP -- Move to <row> <col> */
659 case 'f': /* XXX: HVP -- same? */
660 DEFAULT(escseq.arg[0], 1);
661 DEFAULT(escseq.arg[1], 1);
662 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
663 break;
664 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
665 case 'J': /* ED -- Clear screen */
666 switch(escseq.arg[0]) {
667 case 0: /* below */
668 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
669 break;
670 case 1: /* above */
671 tclearregion(0, 0, term.c.x, term.c.y);
672 break;
673 case 2: /* all */
674 tclearregion(0, 0, term.col-1, term.row-1);
675 break;
676 case 3: /* XXX: erase saved lines (xterm) */
677 default:
678 goto unknown;
679 }
680 break;
681 case 'K': /* EL -- Clear line */
682 switch(escseq.arg[0]) {
683 case 0: /* right */
684 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
685 break;
686 case 1: /* left */
687 tclearregion(0, term.c.y, term.c.x, term.c.y);
688 break;
689 case 2: /* all */
690 tclearregion(0, term.c.y, term.col-1, term.c.y);
691 break;
692 }
693 break;
694 case 'S': /* SU -- Scroll <n> line up */
695 DEFAULT(escseq.arg[0], 1);
696 tscrollup(escseq.arg[0]);
697 break;
698 case 'T': /* SD -- Scroll <n> line down */
699 DEFAULT(escseq.arg[0], 1);
700 tscrolldown(escseq.arg[0]);
701 break;
702 case 'L': /* IL -- Insert <n> blank lines */
703 DEFAULT(escseq.arg[0], 1);
704 tinsertblankline(escseq.arg[0]);
705 break;
706 case 'l': /* RM -- Reset Mode */
707 if(escseq.priv) {
708 switch(escseq.arg[0]) {
709 case 1:
710 term.mode &= ~MODE_APPKEYPAD;
711 break;
712 case 7:
713 term.mode &= ~MODE_WRAP;
714 break;
715 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
716 break;
717 case 25:
718 term.c.state |= CURSOR_HIDE;
719 break;
720 case 1048: /* XXX: no alt. screen to erase/save */
721 case 1049:
722 tcursor(CURSOR_LOAD);
723 tclearregion(0, 0, term.col-1, term.row-1);
724 break;
725 default:
726 goto unknown;
727 }
728 } else {
729 switch(escseq.arg[0]) {
730 case 4:
731 term.mode &= ~MODE_INSERT;
732 break;
733 default:
734 goto unknown;
735 }
736 }
737 break;
738 case 'M': /* DL -- Delete <n> lines */
739 DEFAULT(escseq.arg[0], 1);
740 tdeleteline(escseq.arg[0]);
741 break;
742 case 'X': /* ECH -- Erase <n> char */
743 DEFAULT(escseq.arg[0], 1);
744 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
745 break;
746 case 'P': /* DCH -- Delete <n> char */
747 DEFAULT(escseq.arg[0], 1);
748 tdeletechar(escseq.arg[0]);
749 break;
750 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
751 case 'd': /* VPA -- Move to <row> */
752 DEFAULT(escseq.arg[0], 1);
753 tmoveto(term.c.x, escseq.arg[0]-1);
754 break;
755 case 'h': /* SM -- Set terminal mode */
756 if(escseq.priv) {
757 switch(escseq.arg[0]) {
758 case 1:
759 term.mode |= MODE_APPKEYPAD;
760 break;
761 case 7:
762 term.mode |= MODE_WRAP;
763 break;
764 case 12: /* att610 -- Start blinking cursor (IGNORED) */
765 break;
766 case 25:
767 term.c.state &= ~CURSOR_HIDE;
768 break;
769 case 1048:
770 case 1049: /* XXX: no alt. screen to erase/save */
771 tcursor(CURSOR_SAVE);
772 tclearregion(0, 0, term.col-1, term.row-1);
773 break;
774 default: goto unknown;
775 }
776 } else {
777 switch(escseq.arg[0]) {
778 case 4:
779 term.mode |= MODE_INSERT;
780 break;
781 default: goto unknown;
782 }
783 };
784 break;
785 case 'm': /* SGR -- Terminal attribute (color) */
786 tsetattr(escseq.arg, escseq.narg);
787 break;
788 case 'r': /* DECSTBM -- Set Scrolling Region */
789 if(escseq.priv)
790 goto unknown;
791 else {
792 DEFAULT(escseq.arg[0], 1);
793 DEFAULT(escseq.arg[1], term.row);
794 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
795 tmoveto(0, 0);
796 }
797 break;
798 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
799 tcursor(CURSOR_SAVE);
800 break;
801 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
802 tcursor(CURSOR_LOAD);
803 break;
804 }
805 }
806
807 void
808 csidump(void) {
809 int i;
810 printf("ESC [ %s", escseq.priv ? "? " : "");
811 if(escseq.narg)
812 for(i = 0; i < escseq.narg; i++)
813 printf("%d ", escseq.arg[i]);
814 if(escseq.mode)
815 putchar(escseq.mode);
816 putchar('\n');
817 }
818
819 void
820 csireset(void) {
821 memset(&escseq, 0, sizeof(escseq));
822 }
823
824 void
825 tputtab(void) {
826 int space = TAB - term.c.x % TAB;
827 tmoveto(term.c.x + space, term.c.y);
828 }
829
830 void
831 tputc(char c) {
832 if(term.esc & ESC_START) {
833 if(term.esc & ESC_CSI) {
834 escseq.buf[escseq.len++] = c;
835 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
836 term.esc = 0;
837 csiparse(), csihandle();
838 }
839 } else if(term.esc & ESC_OSC) {
840 if(c == ';') {
841 term.titlelen = 0;
842 term.esc = ESC_START | ESC_TITLE;
843 }
844 } else if(term.esc & ESC_TITLE) {
845 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
846 term.esc = 0;
847 term.title[term.titlelen] = '\0';
848 XStoreName(xw.dis, xw.win, term.title);
849 } else {
850 term.title[term.titlelen++] = c;
851 }
852 } else if(term.esc & ESC_ALTCHARSET) {
853 switch(c) {
854 case '0': /* Line drawing crap */
855 term.c.attr.mode |= ATTR_GFX;
856 break;
857 case 'B': /* Back to regular text */
858 term.c.attr.mode &= ~ATTR_GFX;
859 break;
860 default:
861 printf("esc unhandled charset: ESC ( %c\n", c);
862 }
863 term.esc = 0;
864 } else {
865 switch(c) {
866 case '[':
867 term.esc |= ESC_CSI;
868 break;
869 case ']':
870 term.esc |= ESC_OSC;
871 break;
872 case '(':
873 term.esc |= ESC_ALTCHARSET;
874 break;
875 case 'D': /* IND -- Linefeed */
876 if(term.c.y == term.bot)
877 tscrollup(1);
878 else
879 tmoveto(term.c.x, term.c.y+1);
880 term.esc = 0;
881 break;
882 case 'E': /* NEL -- Next line */
883 tnewline();
884 term.esc = 0;
885 break;
886 case 'M': /* RI -- Reverse index */
887 if(term.c.y == term.top)
888 tscrolldown(1);
889 else
890 tmoveto(term.c.x, term.c.y-1);
891 term.esc = 0;
892 break;
893 case 'c': /* RIS -- Reset to inital state */
894 treset();
895 term.esc = 0;
896 break;
897 case '=': /* DECPAM */
898 term.mode |= MODE_APPKEYPAD;
899 term.esc = 0;
900 break;
901 case '>': /* DECPNM */
902 term.mode &= ~MODE_APPKEYPAD;
903 term.esc = 0;
904 break;
905 case '7':
906 tcursor(CURSOR_SAVE);
907 term.esc = 0;
908 break;
909 case '8':
910 tcursor(CURSOR_LOAD);
911 term.esc = 0;
912 break;
913 default:
914 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
915 term.esc = 0;
916 }
917 }
918 } else {
919 switch(c) {
920 case '\t':
921 tputtab();
922 break;
923 case '\b':
924 tmoveto(term.c.x-1, term.c.y);
925 break;
926 case '\r':
927 tmoveto(0, term.c.y);
928 break;
929 case '\n':
930 tnewline();
931 break;
932 case '\a':
933 xbell();
934 break;
935 case '\033':
936 csireset();
937 term.esc = ESC_START;
938 break;
939 default:
940 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
941 tnewline();
942 tsetchar(c);
943 if(term.c.x+1 < term.col)
944 tmoveto(term.c.x+1, term.c.y);
945 else
946 term.c.state |= CURSOR_WRAPNEXT;
947 break;
948 }
949 }
950 }
951
952 void
953 tputs(char *s, int len) {
954 for(; len > 0; len--)
955 tputc(*s++);
956 }
957
958 void
959 tresize(int col, int row) {
960 int i;
961 int minrow = MIN(row, term.row);
962 int mincol = MIN(col, term.col);
963
964 if(col < 1 || row < 1)
965 return;
966
967 /* free uneeded rows */
968 for(i = row; i < term.row; i++)
969 free(term.line[i]);
970
971 /* resize to new height */
972 term.line = realloc(term.line, row * sizeof(Line));
973
974 /* resize each row to new width, zero-pad if needed */
975 for(i = 0; i < minrow; i++) {
976 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
977 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
978 }
979
980 /* allocate any new rows */
981 for(/* i == minrow */; i < row; i++)
982 term.line[i] = calloc(col, sizeof(Glyph));
983
984 /* update terminal size */
985 term.col = col, term.row = row;
986 /* make use of the LIMIT in tmoveto */
987 tmoveto(term.c.x, term.c.y);
988 /* reset scrolling region */
989 tsetscroll(0, row-1);
990 }
991
992 void
993 xloadcols(void) {
994 int i, r, g, b;
995 XColor color;
996 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
997 unsigned long white = WhitePixel(xw.dis, xw.scr);
998
999 for(i = 0; i < 16; i++) {
1000 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1001 dc.col[i] = white;
1002 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1003 } else
1004 dc.col[i] = color.pixel;
1005 }
1006
1007 /* same colors as xterm */
1008 for(r = 0; r < 6; r++)
1009 for(g = 0; g < 6; g++)
1010 for(b = 0; b < 6; b++) {
1011 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1012 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1013 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1014 if (!XAllocColor(xw.dis, cmap, &color)) {
1015 dc.col[i] = white;
1016 fprintf(stderr, "Could not allocate color %d\n", i);
1017 } else
1018 dc.col[i] = color.pixel;
1019 i++;
1020 }
1021
1022 for(r = 0; r < 24; r++, i++) {
1023 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1024 if (!XAllocColor(xw.dis, cmap, &color)) {
1025 dc.col[i] = white;
1026 fprintf(stderr, "Could not allocate color %d\n", i);
1027 } else
1028 dc.col[i] = color.pixel;
1029 }
1030 }
1031
1032 void
1033 xclear(int x1, int y1, int x2, int y2) {
1034 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1035 XFillRectangle(xw.dis, xw.buf, dc.gc,
1036 x1 * xw.cw, y1 * xw.ch,
1037 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1038 }
1039
1040 void
1041 xhints(void)
1042 {
1043 XClassHint class = {TNAME, TNAME};
1044 XWMHints wm = {.flags = InputHint, .input = 1};
1045 XSizeHints size = {
1046 .flags = PSize | PResizeInc | PBaseSize,
1047 .height = xw.h,
1048 .width = xw.w,
1049 .height_inc = xw.ch,
1050 .width_inc = xw.cw,
1051 .base_height = 2*BORDER,
1052 .base_width = 2*BORDER,
1053 };
1054 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1055 }
1056
1057 void
1058 xinit(void) {
1059 if(!(xw.dis = XOpenDisplay(NULL)))
1060 die("Can't open display\n");
1061 xw.scr = XDefaultScreen(xw.dis);
1062
1063 /* font */
1064 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1065 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1066
1067 /* XXX: Assuming same size for bold font */
1068 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1069 xw.ch = dc.font->ascent + dc.font->descent;
1070
1071 /* colors */
1072 xloadcols();
1073
1074 /* windows */
1075 xw.h = term.row * xw.ch + 2*BORDER;
1076 xw.w = term.col * xw.cw + 2*BORDER;
1077 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1078 xw.w, xw.h, 0,
1079 dc.col[DefaultBG],
1080 dc.col[DefaultBG]);
1081 xw.bufw = xw.w - 2*BORDER;
1082 xw.bufh = xw.h - 2*BORDER;
1083 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1084 /* gc */
1085 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1086 XMapWindow(xw.dis, xw.win);
1087 xhints();
1088 XStoreName(xw.dis, xw.win, "st");
1089 XSync(xw.dis, 0);
1090 }
1091
1092 void
1093 xdraws(char *s, Glyph base, int x, int y, int len) {
1094 unsigned long xfg, xbg;
1095 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1096 int i;
1097
1098 if(base.mode & ATTR_REVERSE)
1099 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1100 else
1101 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1102
1103 XSetBackground(xw.dis, dc.gc, xbg);
1104 XSetForeground(xw.dis, dc.gc, xfg);
1105
1106 if(base.mode & ATTR_GFX)
1107 for(i = 0; i < len; i++)
1108 s[i] = gfx[(int)s[i]];
1109
1110 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1111 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1112
1113 if(base.mode & ATTR_UNDERLINE)
1114 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1115 }
1116
1117 void
1118 xdrawcursor(void) {
1119 static int oldx = 0;
1120 static int oldy = 0;
1121 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1122
1123 LIMIT(oldx, 0, term.col-1);
1124 LIMIT(oldy, 0, term.row-1);
1125
1126 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1127 g.c = term.line[term.c.y][term.c.x].c;
1128
1129 /* remove the old cursor */
1130 if(term.line[oldy][oldx].state & GLYPH_SET)
1131 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1132 else
1133 xclear(oldx, oldy, oldx, oldy);
1134
1135 /* draw the new one */
1136 if(!(term.c.state & CURSOR_HIDE)) {
1137 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1138 oldx = term.c.x, oldy = term.c.y;
1139 }
1140 }
1141
1142 #ifdef DEBUG
1143 /* basic drawing routines */
1144 void
1145 xdrawc(int x, int y, Glyph g) {
1146 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1147 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1148 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1149 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1150 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1151 }
1152
1153 void
1154 draw(int dummy) {
1155 int x, y;
1156
1157 xclear(0, 0, term.col-1, term.row-1);
1158 for(y = 0; y < term.row; y++)
1159 for(x = 0; x < term.col; x++)
1160 if(term.line[y][x].state & GLYPH_SET)
1161 xdrawc(x, y, term.line[y][x]);
1162
1163 xdrawcursor();
1164 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1165 XFlush(xw.dis);
1166 }
1167
1168 #else
1169 /* optimized drawing routine */
1170 void
1171 draw(int redraw_all) {
1172 int i, x, y, ox;
1173 Glyph base, new;
1174 char buf[DRAW_BUF_SIZ];
1175
1176 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1177 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
1178 for(y = 0; y < term.row; y++) {
1179 base = term.line[y][0];
1180 i = ox = 0;
1181 for(x = 0; x < term.col; x++) {
1182 new = term.line[y][x];
1183 if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1184 i >= DRAW_BUF_SIZ)) {
1185 xdraws(buf, base, ox, y, i);
1186 i = 0;
1187 }
1188 if(new.state & GLYPH_SET) {
1189 if(i == 0) {
1190 ox = x;
1191 base = new;
1192 }
1193 buf[i++] = new.c;
1194 }
1195 }
1196 if(i > 0)
1197 xdraws(buf, base, ox, y, i);
1198 }
1199 xdrawcursor();
1200 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1201 XFlush(xw.dis);
1202 }
1203
1204 #endif
1205
1206 void
1207 expose(XEvent *ev) {
1208 draw(SCREEN_REDRAW);
1209 }
1210
1211 char*
1212 kmap(KeySym k) {
1213 int i;
1214 for(i = 0; i < LEN(key); i++)
1215 if(key[i].k == k)
1216 return (char*)key[i].s;
1217 return NULL;
1218 }
1219
1220 void
1221 kpress(XEvent *ev) {
1222 XKeyEvent *e = &ev->xkey;
1223 KeySym ksym;
1224 char buf[32];
1225 char *customkey;
1226 int len;
1227 int meta;
1228 int shift;
1229
1230 meta = e->state & Mod1Mask;
1231 shift = e->state & ShiftMask;
1232 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1233
1234 if((customkey = kmap(ksym)))
1235 ttywrite(customkey, strlen(customkey));
1236 else if(len > 0) {
1237 buf[sizeof(buf)-1] = '\0';
1238 if(meta && len == 1)
1239 ttywrite("\033", 1);
1240 ttywrite(buf, len);
1241 } else
1242 switch(ksym) {
1243 case XK_Up:
1244 case XK_Down:
1245 case XK_Left:
1246 case XK_Right:
1247 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1248 ttywrite(buf, 3);
1249 break;
1250 case XK_Insert:
1251 if(shift)
1252 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1253 break;
1254 default:
1255 fprintf(stderr, "errkey: %d\n", (int)ksym);
1256 break;
1257 }
1258 }
1259
1260 void
1261 resize(XEvent *e) {
1262 int col, row;
1263
1264 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1265 return;
1266
1267 xw.w = e->xconfigure.width;
1268 xw.h = e->xconfigure.height;
1269 xw.bufw = xw.w - 2*BORDER;
1270 xw.bufh = xw.h - 2*BORDER;
1271 col = xw.bufw / xw.cw;
1272 row = xw.bufh / xw.ch;
1273 tresize(col, row);
1274 ttyresize(col, row);
1275 XFreePixmap(xw.dis, xw.buf);
1276 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1277 draw(SCREEN_REDRAW);
1278 }
1279
1280 void
1281 run(void) {
1282 XEvent ev;
1283 fd_set rfd;
1284 int xfd = XConnectionNumber(xw.dis);
1285
1286 running = 1;
1287 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1288 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1289
1290 while(running) {
1291 FD_ZERO(&rfd);
1292 FD_SET(cmdfd, &rfd);
1293 FD_SET(xfd, &rfd);
1294 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1295 if(errno == EINTR)
1296 continue;
1297 die("select failed: %s\n", SERRNO);
1298 }
1299 if(FD_ISSET(cmdfd, &rfd)) {
1300 ttyread();
1301 draw(SCREEN_UPDATE);
1302 }
1303 while(XPending(xw.dis)) {
1304 XNextEvent(xw.dis, &ev);
1305 if(handler[ev.type])
1306 (handler[ev.type])(&ev);
1307 }
1308 }
1309 }
1310
1311 int
1312 main(int argc, char *argv[]) {
1313 if(argc == 2 && !strncmp("-v", argv[1], 3))
1314 die("st-" VERSION ", (c) 2010 st engineers\n");
1315 else if(argc != 1)
1316 die("usage: st [-v]\n");
1317 setlocale(LC_CTYPE, "");
1318 tnew(80, 24);
1319 ttynew();
1320 xinit();
1321 run();
1322 return 0;
1323 }