Xinqi Bao's Git

projects / st.git / blob


5715f0fc0d675c4a234f01792bc22476b5f1518d
[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
161 static void expose(XEvent *);
162 static char* kmap(KeySym);
163 static void kpress(XEvent *);
164 static void resize(XEvent *);
165
166 static void (*handler[LASTEvent])(XEvent *) = {
167 [KeyPress] = kpress,
168 [Expose] = expose,
169 [ConfigureNotify] = resize
170 };
171
172 /* Globals */
173 static DC dc;
174 static XWindow xw;
175 static Term term;
176 static CSIEscape escseq;
177 static int cmdfd;
178 static pid_t pid;
179 static int running;
180
181 #ifdef DEBUG
182 void
183 tdump(void) {
184 int row, col;
185 Glyph c;
186
187 for(row = 0; row < term.row; row++) {
188 for(col = 0; col < term.col; col++) {
189 if(col == term.c.x && row == term.c.y)
190 putchar('#');
191 else {
192 c = term.line[row][col];
193 putchar(c.state & GLYPH_SET ? c.c : '.');
194 }
195 }
196 putchar('\n');
197 }
198 }
199 #endif
200
201 void
202 die(const char *errstr, ...) {
203 va_list ap;
204
205 va_start(ap, errstr);
206 vfprintf(stderr, errstr, ap);
207 va_end(ap);
208 exit(EXIT_FAILURE);
209 }
210
211 void
212 execsh(void) {
213 char *args[3] = {getenv("SHELL"), "-i", NULL};
214 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
215 putenv("TERM=" TNAME);
216 execvp(args[0], args);
217 }
218
219 void
220 xbell(void) { /* visual bell */
221 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
222 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
223 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
224 /* usleep(30000); */
225 draw(SCREEN_REDRAW);
226 }
227
228 void
229 sigchld(int a) {
230 int stat = 0;
231 if(waitpid(pid, &stat, 0) < 0)
232 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
233 if(WIFEXITED(stat))
234 exit(WEXITSTATUS(stat));
235 else
236 exit(EXIT_FAILURE);
237 }
238
239 void
240 ttynew(void) {
241 int m, s;
242 char *pts;
243
244 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
245 die("openpt failed: %s\n", SERRNO);
246 if(grantpt(m) < 0)
247 die("grandpt failed: %s\n", SERRNO);
248 if(unlockpt(m) < 0)
249 die("unlockpt failed: %s\n", SERRNO);
250 if(!(pts = ptsname(m)))
251 die("ptsname failed: %s\n", SERRNO);
252 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
253 die("Couldn't open slave: %s\n", SERRNO);
254 fcntl(s, F_SETFL, O_NDELAY);
255 switch(pid = fork()) {
256 case -1:
257 die("fork failed\n");
258 break;
259 case 0:
260 setsid(); /* create a new process group */
261 dup2(s, STDIN_FILENO);
262 dup2(s, STDOUT_FILENO);
263 dup2(s, STDERR_FILENO);
264 if(ioctl(s, TIOCSCTTY, NULL) < 0)
265 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
266 execsh();
267 break;
268 default:
269 close(s);
270 cmdfd = m;
271 signal(SIGCHLD, sigchld);
272 }
273 }
274
275 void
276 dump(char c) {
277 static int col;
278 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
279 if(++col % 10 == 0)
280 fprintf(stderr, "\n");
281 }
282
283 void
284 ttyread(void) {
285 char buf[BUFSIZ] = {0};
286 int ret;
287
288 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
289 die("Couldn't read from shell: %s\n", SERRNO);
290 else
291 tputs(buf, ret);
292 }
293
294 void
295 ttywrite(const char *s, size_t n) {
296 if(write(cmdfd, s, n) == -1)
297 die("write error on tty: %s\n", SERRNO);
298 }
299
300 void
301 ttyresize(int x, int y) {
302 struct winsize w;
303
304 w.ws_row = term.row;
305 w.ws_col = term.col;
306 w.ws_xpixel = w.ws_ypixel = 0;
307 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
308 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
309 }
310
311 void
312 tcursor(int mode) {
313 static TCursor c;
314
315 if(mode == CURSOR_SAVE)
316 c = term.c;
317 else if(mode == CURSOR_LOAD)
318 term.c = c, tmoveto(c.x, c.y);
319 }
320
321 void
322 treset(void) {
323 term.c.attr.mode = ATTR_NULL;
324 term.c.attr.fg = DefaultFG;
325 term.c.attr.bg = DefaultBG;
326 term.c.x = term.c.y = 0;
327 term.hidec = 0;
328 term.top = 0, term.bot = term.row - 1;
329 term.mode = MODE_WRAP;
330 tclearregion(0, 0, term.col-1, term.row-1);
331 }
332
333 void
334 tnew(int col, int row) { /* screen size */
335 term.row = row, term.col = col;
336 term.top = 0, term.bot = term.row - 1;
337 /* mode */
338 term.mode = MODE_WRAP;
339 /* cursor */
340 term.c.attr.mode = ATTR_NULL;
341 term.c.attr.fg = DefaultFG;
342 term.c.attr.bg = DefaultBG;
343 term.c.x = term.c.y = 0;
344 term.hidec = 0;
345 /* allocate screen */
346 term.line = calloc(term.row, sizeof(Line));
347 for(row = 0 ; row < term.row; row++)
348 term.line[row] = calloc(term.col, sizeof(Glyph));
349 }
350
351 /* TODO: Replace with scrollup/scolldown */
352 void
353 tscroll(void) {
354 Line temp = term.line[term.top];
355 int i;
356
357 for(i = term.top; i < term.bot; i++)
358 term.line[i] = term.line[i+1];
359 memset(temp, 0, sizeof(Glyph) * term.col);
360 term.line[term.bot] = temp;
361 }
362
363 void
364 tscrolldown (int n) {
365 int i;
366 Line temp;
367
368 LIMIT(n, 0, term.bot-term.top+1);
369
370 for(i = 0; i < n; i++)
371 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
372
373 for(i = term.bot; i >= term.top+n; i--) {
374 temp = term.line[i];
375 term.line[i] = term.line[i-n];
376 term.line[i-n] = temp;
377 }
378 }
379
380 void
381 tscrollup (int n) {
382 int i;
383 Line temp;
384 LIMIT(n, 0, term.bot-term.top+1);
385
386 for(i = 0; i < n; i++)
387 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
388
389 for(i = term.top; i <= term.bot-n; i++) {
390 temp = term.line[i];
391 term.line[i] = term.line[i+n];
392 term.line[i+n] = temp;
393 }
394 }
395
396 void
397 tnewline(void) {
398 int y = term.c.y + 1;
399 if(y > term.bot)
400 tscroll(), y = term.bot;
401 tmoveto(0, y);
402 }
403
404 void
405 csiparse(void) {
406 /* int noarg = 1; */
407 char *p = escseq.buf;
408
409 escseq.narg = 0;
410 if(*p == '?')
411 escseq.priv = 1, p++;
412
413 while(p < escseq.buf+escseq.len) {
414 while(isdigit(*p)) {
415 escseq.arg[escseq.narg] *= 10;
416 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
417 }
418 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
419 escseq.narg++, p++;
420 else {
421 escseq.mode = *p;
422 escseq.narg++;
423 return;
424 }
425 }
426 }
427
428 void
429 tmoveto(int x, int y) {
430 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
431 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
432 }
433
434 void
435 tmovecursor(int dir) {
436 int xf = term.c.x, yf = term.c.y;
437
438 switch(dir) {
439 case CURSOR_UP:
440 yf--;
441 break;
442 case CURSOR_DOWN:
443 yf++;
444 break;
445 case CURSOR_LEFT:
446 xf--;
447 if(term.mode & MODE_WRAP && xf < 0) {
448 xf = term.col-1, yf--;
449 if(yf < term.top)
450 yf = term.top, xf = 0;
451 }
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-size, 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 - n - src;
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, 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
867 if(term.c.x + space >= term.col)
868 space--;
869
870 for(; space > 0; space--)
871 tmovecursor(CURSOR_RIGHT);
872 }
873
874 void
875 tputc(char c) {
876 if(term.esc & ESC_START) {
877 if(term.esc & ESC_CSI) {
878 escseq.buf[escseq.len++] = c;
879 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
880 term.esc = 0;
881 csiparse(), csihandle();
882 }
883 } else if(term.esc & ESC_OSC) {
884 if(c == ';') {
885 term.titlelen = 0;
886 term.esc = ESC_START | ESC_TITLE;
887 }
888 } else if(term.esc & ESC_TITLE) {
889 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
890 term.esc = 0;
891 term.title[term.titlelen] = '\0';
892 XStoreName(xw.dis, xw.win, term.title);
893 } else {
894 term.title[term.titlelen++] = c;
895 }
896 } else if(term.esc & ESC_ALTCHARSET) {
897 switch(c) {
898 case '0': /* Line drawing crap */
899 term.c.attr.mode |= ATTR_GFX;
900 break;
901 case 'B': /* Back to regular text */
902 term.c.attr.mode &= ~ATTR_GFX;
903 break;
904 default:
905 printf("esc unhandled charset: ESC ( %c\n", c);
906 }
907 term.esc = 0;
908 } else {
909 switch(c) {
910 case '[':
911 term.esc |= ESC_CSI;
912 break;
913 case ']':
914 term.esc |= ESC_OSC;
915 break;
916 case '(':
917 term.esc |= ESC_ALTCHARSET;
918 break;
919 case 'A':
920 tmoveto(term.c.x, term.c.y-1);
921 term.esc = 0;
922 break;
923 case 'B':
924 tmoveto(term.c.x, term.c.y+1);
925 term.esc = 0;
926 break;
927 case 'C':
928 tmoveto(term.c.x+1, term.c.y);
929 term.esc = 0;
930 break;
931 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
932 tmoveto(term.c.x-1, term.c.y);
933 term.esc = 0;
934 break;
935 case 'E': /* NEL -- Next line */
936 tnewline();
937 term.esc = 0;
938 break;
939 case 'M': /* RI -- Reverse index */
940 if(term.c.y == term.top)
941 tscrolldown(1);
942 else
943 tmoveto(term.c.x, term.c.y-1);
944 term.esc = 0;
945 break;
946 case 'c': /* RIS -- Reset to inital state */
947 treset();
948 term.esc = 0;
949 break;
950 case '=': /* DECPAM */
951 term.mode |= MODE_APPKEYPAD;
952 term.esc = 0;
953 break;
954 case '>': /* DECPNM */
955 term.mode &= ~MODE_APPKEYPAD;
956 term.esc = 0;
957 break;
958 case '7':
959 tcursor(CURSOR_SAVE);
960 term.esc = 0;
961 break;
962 case '8':
963 tcursor(CURSOR_LOAD);
964 term.esc = 0;
965 break;
966 default:
967 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
968 term.esc = 0;
969 }
970 }
971 } else {
972 switch(c) {
973 case '\t':
974 tputtab();
975 break;
976 case '\b':
977 tmovecursor(CURSOR_LEFT);
978 break;
979 case '\r':
980 tmoveto(0, term.c.y);
981 break;
982 case '\n':
983 tnewline();
984 break;
985 case '\a':
986 xbell();
987 break;
988 case '\033':
989 csireset();
990 term.esc = ESC_START;
991 break;
992 default:
993 tsetchar(c);
994 tmovecursor(CURSOR_RIGHT);
995 break;
996 }
997 }
998 }
999
1000 void
1001 tputs(char *s, int len) {
1002 for(; len > 0; len--)
1003 tputc(*s++);
1004 }
1005
1006 void
1007 tresize(int col, int row) {
1008 int i;
1009 Line *line;
1010 int minrow = MIN(row, term.row);
1011 int mincol = MIN(col, term.col);
1012
1013 if(col < 1 || row < 1)
1014 return;
1015 /* alloc */
1016 line = calloc(row, sizeof(Line));
1017 for(i = 0 ; i < row; i++)
1018 line[i] = calloc(col, sizeof(Glyph));
1019 /* copy */
1020 for(i = 0 ; i < minrow; i++)
1021 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
1022 /* free */
1023 for(i = 0; i < term.row; i++)
1024 free(term.line[i]);
1025 free(term.line);
1026
1027 LIMIT(term.c.x, 0, col-1);
1028 LIMIT(term.c.y, 0, row-1);
1029 LIMIT(term.top, 0, row-1);
1030 LIMIT(term.bot, 0, row-1);
1031
1032 term.bot = row-1;
1033 term.line = line;
1034 term.col = col, term.row = row;
1035 }
1036
1037 void
1038 tloadcols(void) {
1039 int i, r, g, b;
1040 XColor color;
1041 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1042 unsigned long white = WhitePixel(xw.dis, xw.scr);
1043
1044 for(i = 0; i < 16; i++) {
1045 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1046 dc.col[i] = white;
1047 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1048 } else
1049 dc.col[i] = color.pixel;
1050 }
1051
1052 /* same colors as xterm */
1053 for(r = 0; r < 6; r++)
1054 for(g = 0; g < 6; g++)
1055 for(b = 0; b < 6; b++) {
1056 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1057 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1058 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1059 if (!XAllocColor(xw.dis, cmap, &color)) {
1060 dc.col[i] = white;
1061 fprintf(stderr, "Could not allocate color %d\n", i);
1062 } else
1063 dc.col[i] = color.pixel;
1064 i++;
1065 }
1066
1067 for(r = 0; r < 24; r++, i++) {
1068 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1069 if (!XAllocColor(xw.dis, cmap, &color)) {
1070 dc.col[i] = white;
1071 fprintf(stderr, "Could not allocate color %d\n", i);
1072 } else
1073 dc.col[i] = color.pixel;
1074 }
1075 }
1076
1077 void
1078 xclear(int x1, int y1, int x2, int y2) {
1079 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1080 XFillRectangle(xw.dis, xw.buf, dc.gc,
1081 x1 * xw.cw, y1 * xw.ch,
1082 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1083 }
1084
1085 void
1086 xhints(void)
1087 {
1088 XClassHint class = {TNAME, TNAME};
1089 XWMHints wm = {.flags = InputHint, .input = 1};
1090 XSizeHints size = {
1091 .flags = PSize | PResizeInc | PBaseSize,
1092 .height = xw.h,
1093 .width = xw.w,
1094 .height_inc = xw.ch,
1095 .width_inc = xw.cw,
1096 .base_height = 2*BORDER,
1097 .base_width = 2*BORDER,
1098 };
1099 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1100 }
1101
1102 void
1103 xinit(void) {
1104 xw.dis = XOpenDisplay(NULL);
1105 xw.scr = XDefaultScreen(xw.dis);
1106 if(!xw.dis)
1107 die("Can't open display\n");
1108
1109 /* font */
1110 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1111 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1112
1113 /* XXX: Assuming same size for bold font */
1114 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1115 xw.ch = dc.font->ascent + dc.font->descent;
1116
1117 /* colors */
1118 tloadcols();
1119
1120 term.c.attr.fg = DefaultFG;
1121 term.c.attr.bg = DefaultBG;
1122 term.c.attr.mode = ATTR_NULL;
1123 /* windows */
1124 xw.h = term.row * xw.ch + 2*BORDER;
1125 xw.w = term.col * xw.cw + 2*BORDER;
1126 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1127 xw.w, xw.h, 0,
1128 dc.col[DefaultBG],
1129 dc.col[DefaultBG]);
1130 xw.bufw = xw.w - 2*BORDER;
1131 xw.bufh = xw.h - 2*BORDER;
1132 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1133 /* gc */
1134 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1135 XMapWindow(xw.dis, xw.win);
1136 xhints();
1137 XStoreName(xw.dis, xw.win, "st");
1138 XSync(xw.dis, 0);
1139 }
1140
1141 void
1142 xdraws(char *s, Glyph base, int x, int y, int len) {
1143 unsigned long xfg, xbg;
1144 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1145 int i;
1146
1147 if(base.mode & ATTR_REVERSE)
1148 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1149 else
1150 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1151
1152 XSetBackground(xw.dis, dc.gc, xbg);
1153 XSetForeground(xw.dis, dc.gc, xfg);
1154
1155 if(base.mode & ATTR_GFX)
1156 for(i = 0; i < len; i++)
1157 s[i] = gfx[(int)s[i]];
1158
1159 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1160 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1161
1162 if(base.mode & ATTR_UNDERLINE)
1163 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1164 }
1165
1166 void
1167 xcursor(int mode) {
1168 static int oldx = 0;
1169 static int oldy = 0;
1170 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1171
1172 LIMIT(oldx, 0, term.col-1);
1173 LIMIT(oldy, 0, term.row-1);
1174
1175 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1176 g.c = term.line[term.c.y][term.c.x].c;
1177
1178 /* remove the old cursor */
1179 if(term.line[oldy][oldx].state & GLYPH_SET)
1180 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1181 else
1182 xclear(oldx, oldy, oldx, oldy);
1183
1184 /* draw the new one */
1185 if(mode == CURSOR_DRAW) {
1186 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1187 oldx = term.c.x, oldy = term.c.y;
1188 }
1189 }
1190
1191 #ifdef DEBUG
1192 /* basic drawing routines */
1193 void
1194 xdrawc(int x, int y, Glyph g) {
1195 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1196 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1197 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1198 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1199 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1200 }
1201
1202 void
1203 draw(int dummy) {
1204 int x, y;
1205
1206 xclear(0, 0, term.col-1, term.row-1);
1207 for(y = 0; y < term.row; y++)
1208 for(x = 0; x < term.col; x++)
1209 if(term.line[y][x].state & GLYPH_SET)
1210 xdrawc(x, y, term.line[y][x]);
1211
1212 if(!term.hidec)
1213 xcursor(CURSOR_DRAW);
1214 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1215 XFlush(xw.dis);
1216 }
1217
1218 #else
1219 /* optimized drawing routine */
1220 void
1221 draw(int redraw_all) {
1222 int i, x, y, ox;
1223 Glyph base, new;
1224 char buf[DRAW_BUF_SIZ];
1225
1226 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1227 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1228 for(y = 0; y < term.row; y++) {
1229 base = term.line[y][0];
1230 i = ox = 0;
1231 for(x = 0; x < term.col; x++) {
1232 new = term.line[y][x];
1233 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1234 buf[i++] = new.c;
1235 else {
1236 xdraws(buf, base, ox, y, i);
1237 buf[0] = new.c;
1238 i = 1;
1239 ox = x;
1240 base = new;
1241 }
1242 }
1243 xdraws(buf, base, ox, y, i);
1244 }
1245 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1246 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1247 XFlush(xw.dis);
1248 }
1249
1250 #endif
1251
1252 void
1253 expose(XEvent *ev) {
1254 draw(SCREEN_REDRAW);
1255 }
1256
1257 char*
1258 kmap(KeySym k) {
1259 int i;
1260 for(i = 0; i < LEN(key); i++)
1261 if(key[i].k == k)
1262 return (char*)key[i].s;
1263 return NULL;
1264 }
1265
1266 void
1267 kpress(XEvent *ev) {
1268 XKeyEvent *e = &ev->xkey;
1269 KeySym ksym;
1270 char buf[32];
1271 char *customkey;
1272 int len;
1273 int meta;
1274 int shift;
1275
1276 meta = e->state & Mod1Mask;
1277 shift = e->state & ShiftMask;
1278 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1279
1280 if((customkey = kmap(ksym)))
1281 ttywrite(customkey, strlen(customkey));
1282 else if(len > 0) {
1283 buf[sizeof(buf)-1] = '\0';
1284 if(meta && len == 1)
1285 ttywrite("\033", 1);
1286 ttywrite(buf, len);
1287 } else
1288 switch(ksym) {
1289 case XK_Up:
1290 case XK_Down:
1291 case XK_Left:
1292 case XK_Right:
1293 sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1294 ttywrite(buf, 3);
1295 break;
1296 case XK_Insert:
1297 if(shift)
1298 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1299 break;
1300 default:
1301 fprintf(stderr, "errkey: %d\n", (int)ksym);
1302 break;
1303 }
1304 }
1305
1306 void
1307 resize(XEvent *e) {
1308 int col, row;
1309
1310 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1311 return;
1312
1313 xw.w = e->xconfigure.width;
1314 xw.h = e->xconfigure.height;
1315 xw.bufw = xw.w - 2*BORDER;
1316 xw.bufh = xw.h - 2*BORDER;
1317 col = xw.bufw / xw.cw;
1318 row = xw.bufh / xw.ch;
1319 tresize(col, row);
1320 ttyresize(col, row);
1321 XFreePixmap(xw.dis, xw.buf);
1322 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1323 draw(SCREEN_REDRAW);
1324 }
1325
1326 void
1327 run(void) {
1328 XEvent ev;
1329 fd_set rfd;
1330 int xfd = XConnectionNumber(xw.dis);
1331
1332 running = 1;
1333 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1334 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1335
1336 while(running) {
1337 FD_ZERO(&rfd);
1338 FD_SET(cmdfd, &rfd);
1339 FD_SET(xfd, &rfd);
1340 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1341 if(errno == EINTR)
1342 continue;
1343 die("select failed: %s\n", SERRNO);
1344 }
1345 if(FD_ISSET(cmdfd, &rfd)) {
1346 ttyread();
1347 draw(SCREEN_UPDATE);
1348 }
1349 while(XPending(xw.dis)) {
1350 XNextEvent(xw.dis, &ev);
1351 if(handler[ev.type])
1352 (handler[ev.type])(&ev);
1353 }
1354 }
1355 }
1356
1357 int
1358 main(int argc, char *argv[]) {
1359 if(argc == 2 && !strncmp("-v", argv[1], 3))
1360 die("st-" VERSION ", © 2009 st engineers\n");
1361 else if(argc != 1)
1362 die("usage: st [-v]\n");
1363 setlocale(LC_CTYPE, "");
1364 tnew(80, 24);
1365 ttynew();
1366 xinit();
1367 run();
1368 return 0;
1369 }