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