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removed (visual) bell. '\a' sets the urgency flag if st is unfocused.
[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 int hasfocus;
112 } XWindow;
113
114 typedef struct {
115 KeySym k;
116 char s[ESC_BUF_SIZ];
117 } Key;
118
119 /* Drawing Context */
120 typedef struct {
121 unsigned long col[256];
122 XFontStruct* font;
123 XFontStruct* bfont;
124 GC gc;
125 } DC;
126
127 #include "config.h"
128
129 static void die(const char *errstr, ...);
130 static void draw(int);
131 static void execsh(void);
132 static void sigchld(int);
133 static void run(void);
134
135 static void csidump(void);
136 static void csihandle(void);
137 static void csiparse(void);
138 static void csireset(void);
139
140 static void tclearregion(int, int, int, int);
141 static void tcursor(int);
142 static void tdeletechar(int);
143 static void tdeleteline(int);
144 static void tinsertblank(int);
145 static void tinsertblankline(int);
146 static void tmoveto(int, int);
147 static void tnew(int, int);
148 static void tnewline(void);
149 static void tputtab(void);
150 static void tputc(char);
151 static void tputs(char*, int);
152 static void treset(void);
153 static void tresize(int, int);
154 static void tscrollup(int);
155 static void tscrolldown(int);
156 static void tsetattr(int*, int);
157 static void tsetchar(char);
158 static void tsetscroll(int, int);
159
160 static void ttynew(void);
161 static void ttyread(void);
162 static void ttyresize(int, int);
163 static void ttywrite(const char *, size_t);
164
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 static void xseturgency(int);
172
173 static void expose(XEvent *);
174 static char* kmap(KeySym);
175 static void kpress(XEvent *);
176 static void resize(XEvent *);
177 static void focus(XEvent *);
178
179
180 static void (*handler[LASTEvent])(XEvent *) = {
181 [KeyPress] = kpress,
182 [Expose] = expose,
183 [ConfigureNotify] = resize,
184 [FocusIn] = focus,
185 [FocusOut] = focus,
186 };
187
188 /* Globals */
189 static DC dc;
190 static XWindow xw;
191 static Term term;
192 static CSIEscape escseq;
193 static int cmdfd;
194 static pid_t pid;
195
196 #ifdef DEBUG
197 void
198 tdump(void) {
199 int row, col;
200 Glyph c;
201
202 for(row = 0; row < term.row; row++) {
203 for(col = 0; col < term.col; col++) {
204 if(col == term.c.x && row == term.c.y)
205 putchar('#');
206 else {
207 c = term.line[row][col];
208 putchar(c.state & GLYPH_SET ? c.c : '.');
209 }
210 }
211 putchar('\n');
212 }
213 }
214 #endif
215
216 void
217 die(const char *errstr, ...) {
218 va_list ap;
219
220 va_start(ap, errstr);
221 vfprintf(stderr, errstr, ap);
222 va_end(ap);
223 exit(EXIT_FAILURE);
224 }
225
226 void
227 execsh(void) {
228 char *args[3] = {getenv("SHELL"), "-i", NULL};
229 DEFAULT(args[0], "/bin/sh"); /* if getenv() failed */
230 putenv("TERM=" TNAME);
231 execvp(args[0], args);
232 }
233
234 void
235 sigchld(int a) {
236 int stat = 0;
237 if(waitpid(pid, &stat, 0) < 0)
238 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
239 if(WIFEXITED(stat))
240 exit(WEXITSTATUS(stat));
241 else
242 exit(EXIT_FAILURE);
243 }
244
245 void
246 ttynew(void) {
247 int m, s;
248
249 /* seems to work fine on linux, openbsd and freebsd */
250 struct winsize w = {term.row, term.col, 0, 0};
251 if(openpty(&m, &s, NULL, NULL, &w) < 0)
252 die("openpty failed: %s\n", SERRNO);
253
254 switch(pid = fork()) {
255 case -1:
256 die("fork failed\n");
257 break;
258 case 0:
259 setsid(); /* create a new process group */
260 dup2(s, STDIN_FILENO);
261 dup2(s, STDOUT_FILENO);
262 dup2(s, STDERR_FILENO);
263 if(ioctl(s, TIOCSCTTY, NULL) < 0)
264 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
265 close(s);
266 close(m);
267 execsh();
268 break;
269 default:
270 close(s);
271 cmdfd = m;
272 signal(SIGCHLD, sigchld);
273 }
274 }
275
276 void
277 dump(char c) {
278 static int col;
279 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
280 if(++col % 10 == 0)
281 fprintf(stderr, "\n");
282 }
283
284 void
285 ttyread(void) {
286 char buf[BUFSIZ] = {0};
287 int ret;
288
289 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
290 die("Couldn't read from shell: %s\n", SERRNO);
291 else
292 tputs(buf, ret);
293 }
294
295 void
296 ttywrite(const char *s, size_t n) {
297 if(write(cmdfd, s, n) == -1)
298 die("write error on tty: %s\n", SERRNO);
299 }
300
301 void
302 ttyresize(int x, int y) {
303 struct winsize w;
304
305 w.ws_row = term.row;
306 w.ws_col = term.col;
307 w.ws_xpixel = w.ws_ypixel = 0;
308 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
309 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
310 }
311
312 void
313 tcursor(int mode) {
314 static TCursor c;
315
316 if(mode == CURSOR_SAVE)
317 c = term.c;
318 else if(mode == CURSOR_LOAD)
319 term.c = c, tmoveto(c.x, c.y);
320 }
321
322 void
323 treset(void) {
324 term.c = (TCursor){{
325 .mode = ATTR_NULL,
326 .fg = DefaultFG,
327 .bg = DefaultBG
328 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
329
330 term.top = 0, term.bot = term.row - 1;
331 term.mode = MODE_WRAP;
332 tclearregion(0, 0, term.col-1, term.row-1);
333 }
334
335 void
336 tnew(int col, int row) {
337 /* set screen size */
338 term.row = row, term.col = col;
339 term.line = malloc(term.row * sizeof(Line));
340 for(row = 0 ; row < term.row; row++)
341 term.line[row] = malloc(term.col * sizeof(Glyph));
342 /* setup screen */
343 treset();
344 }
345
346 void
347 tscrolldown (int n) {
348 int i;
349 Line temp;
350
351 LIMIT(n, 0, term.bot-term.top+1);
352
353 for(i = 0; i < n; i++)
354 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
355
356 for(i = term.bot; i >= term.top+n; i--) {
357 temp = term.line[i];
358 term.line[i] = term.line[i-n];
359 term.line[i-n] = temp;
360 }
361 }
362
363 void
364 tscrollup (int n) {
365 int i;
366 Line temp;
367 LIMIT(n, 0, term.bot-term.top+1);
368
369 for(i = 0; i < n; i++)
370 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
371
372 for(i = term.top; i <= term.bot-n; i++) {
373 temp = term.line[i];
374 term.line[i] = term.line[i+n];
375 term.line[i+n] = temp;
376 }
377 }
378
379 void
380 tnewline(void) {
381 int y = term.c.y + 1;
382 if(y > term.bot)
383 tscrollup(1), y = term.bot;
384 tmoveto(0, y);
385 }
386
387 void
388 csiparse(void) {
389 /* int noarg = 1; */
390 char *p = escseq.buf;
391
392 escseq.narg = 0;
393 if(*p == '?')
394 escseq.priv = 1, p++;
395
396 while(p < escseq.buf+escseq.len) {
397 while(isdigit(*p)) {
398 escseq.arg[escseq.narg] *= 10;
399 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
400 }
401 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
402 escseq.narg++, p++;
403 else {
404 escseq.mode = *p;
405 escseq.narg++;
406 return;
407 }
408 }
409 }
410
411 void
412 tmoveto(int x, int y) {
413 LIMIT(x, 0, term.col-1);
414 LIMIT(y, 0, term.row-1);
415 term.c.state &= ~CURSOR_WRAPNEXT;
416 term.c.x = x;
417 term.c.y = y;
418 }
419
420 void
421 tsetchar(char c) {
422 term.line[term.c.y][term.c.x] = term.c.attr;
423 term.line[term.c.y][term.c.x].c = c;
424 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
425 }
426
427 void
428 tclearregion(int x1, int y1, int x2, int y2) {
429 int y, temp;
430
431 if(x1 > x2)
432 temp = x1, x1 = x2, x2 = temp;
433 if(y1 > y2)
434 temp = y1, y1 = y2, y2 = temp;
435
436 LIMIT(x1, 0, term.col-1);
437 LIMIT(x2, 0, term.col-1);
438 LIMIT(y1, 0, term.row-1);
439 LIMIT(y2, 0, term.row-1);
440
441 for(y = y1; y <= y2; y++)
442 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
443 }
444
445 void
446 tdeletechar(int n) {
447 int src = term.c.x + n;
448 int dst = term.c.x;
449 int size = term.col - src;
450
451 if(src >= term.col) {
452 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
453 return;
454 }
455 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
456 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
457 }
458
459 void
460 tinsertblank(int n) {
461 int src = term.c.x;
462 int dst = src + n;
463 int size = term.col - dst;
464
465 if(dst >= term.col) {
466 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
467 return;
468 }
469 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
470 tclearregion(src, term.c.y, dst - 1, term.c.y);
471 }
472
473 void
474 tinsertblankline(int n) {
475 int i;
476 Line blank;
477 int bot = term.bot;
478
479 if(term.c.y > term.bot)
480 bot = term.row - 1;
481 else if(term.c.y < term.top)
482 bot = term.top - 1;
483 if(term.c.y + n >= bot) {
484 tclearregion(0, term.c.y, term.col-1, bot);
485 return;
486 }
487 for(i = bot; i >= term.c.y+n; i--) {
488 /* swap deleted line <-> blanked line */
489 blank = term.line[i];
490 term.line[i] = term.line[i-n];
491 term.line[i-n] = blank;
492 /* blank it */
493 memset(blank, 0, term.col * sizeof(Glyph));
494 }
495 }
496
497 void
498 tdeleteline(int n) {
499 int i;
500 Line blank;
501 int bot = term.bot;
502
503 if(term.c.y > term.bot)
504 bot = term.row - 1;
505 else if(term.c.y < term.top)
506 bot = term.top - 1;
507 if(term.c.y + n >= bot) {
508 tclearregion(0, term.c.y, term.col-1, bot);
509 return;
510 }
511 for(i = term.c.y; i <= bot-n; i++) {
512 /* swap deleted line <-> blanked line */
513 blank = term.line[i];
514 term.line[i] = term.line[i+n];
515 term.line[i+n] = blank;
516 /* blank it */
517 memset(blank, 0, term.col * sizeof(Glyph));
518 }
519 }
520
521 void
522 tsetattr(int *attr, int l) {
523 int i;
524
525 for(i = 0; i < l; i++) {
526 switch(attr[i]) {
527 case 0:
528 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
529 term.c.attr.fg = DefaultFG;
530 term.c.attr.bg = DefaultBG;
531 break;
532 case 1:
533 term.c.attr.mode |= ATTR_BOLD;
534 break;
535 case 4:
536 term.c.attr.mode |= ATTR_UNDERLINE;
537 break;
538 case 7:
539 term.c.attr.mode |= ATTR_REVERSE;
540 break;
541 case 22:
542 term.c.attr.mode &= ~ATTR_BOLD;
543 break;
544 case 24:
545 term.c.attr.mode &= ~ATTR_UNDERLINE;
546 break;
547 case 27:
548 term.c.attr.mode &= ~ATTR_REVERSE;
549 break;
550 case 38:
551 if (i + 2 < l && attr[i + 1] == 5) {
552 i += 2;
553 if (BETWEEN(attr[i], 0, 255))
554 term.c.attr.fg = attr[i];
555 else
556 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
557 }
558 else
559 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
560 break;
561 case 39:
562 term.c.attr.fg = DefaultFG;
563 break;
564 case 48:
565 if (i + 2 < l && attr[i + 1] == 5) {
566 i += 2;
567 if (BETWEEN(attr[i], 0, 255))
568 term.c.attr.bg = attr[i];
569 else
570 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
571 }
572 else
573 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
574 break;
575 case 49:
576 term.c.attr.bg = DefaultBG;
577 break;
578 default:
579 if(BETWEEN(attr[i], 30, 37))
580 term.c.attr.fg = attr[i] - 30;
581 else if(BETWEEN(attr[i], 40, 47))
582 term.c.attr.bg = attr[i] - 40;
583 else if(BETWEEN(attr[i], 90, 97))
584 term.c.attr.fg = attr[i] - 90 + 8;
585 else if(BETWEEN(attr[i], 100, 107))
586 term.c.attr.fg = attr[i] - 100 + 8;
587 else
588 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
589 break;
590 }
591 }
592 }
593
594 void
595 tsetscroll(int t, int b) {
596 int temp;
597
598 LIMIT(t, 0, term.row-1);
599 LIMIT(b, 0, term.row-1);
600 if(t > b) {
601 temp = t;
602 t = b;
603 b = temp;
604 }
605 term.top = t;
606 term.bot = b;
607 }
608
609 void
610 csihandle(void) {
611 switch(escseq.mode) {
612 default:
613 unknown:
614 printf("erresc: unknown csi ");
615 csidump();
616 /* die(""); */
617 break;
618 case '@': /* ICH -- Insert <n> blank char */
619 DEFAULT(escseq.arg[0], 1);
620 tinsertblank(escseq.arg[0]);
621 break;
622 case 'A': /* CUU -- Cursor <n> Up */
623 case 'e':
624 DEFAULT(escseq.arg[0], 1);
625 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
626 break;
627 case 'B': /* CUD -- Cursor <n> Down */
628 DEFAULT(escseq.arg[0], 1);
629 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
630 break;
631 case 'C': /* CUF -- Cursor <n> Forward */
632 case 'a':
633 DEFAULT(escseq.arg[0], 1);
634 tmoveto(term.c.x+escseq.arg[0], term.c.y);
635 break;
636 case 'D': /* CUB -- Cursor <n> Backward */
637 DEFAULT(escseq.arg[0], 1);
638 tmoveto(term.c.x-escseq.arg[0], term.c.y);
639 break;
640 case 'E': /* CNL -- Cursor <n> Down and first col */
641 DEFAULT(escseq.arg[0], 1);
642 tmoveto(0, term.c.y+escseq.arg[0]);
643 break;
644 case 'F': /* CPL -- Cursor <n> Up and first col */
645 DEFAULT(escseq.arg[0], 1);
646 tmoveto(0, term.c.y-escseq.arg[0]);
647 break;
648 case 'G': /* CHA -- Move to <col> */
649 case '`': /* XXX: HPA -- same? */
650 DEFAULT(escseq.arg[0], 1);
651 tmoveto(escseq.arg[0]-1, term.c.y);
652 break;
653 case 'H': /* CUP -- Move to <row> <col> */
654 case 'f': /* XXX: HVP -- same? */
655 DEFAULT(escseq.arg[0], 1);
656 DEFAULT(escseq.arg[1], 1);
657 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
658 break;
659 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
660 case 'J': /* ED -- Clear screen */
661 switch(escseq.arg[0]) {
662 case 0: /* below */
663 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
664 break;
665 case 1: /* above */
666 tclearregion(0, 0, term.c.x, term.c.y);
667 break;
668 case 2: /* all */
669 tclearregion(0, 0, term.col-1, term.row-1);
670 break;
671 case 3: /* XXX: erase saved lines (xterm) */
672 default:
673 goto unknown;
674 }
675 break;
676 case 'K': /* EL -- Clear line */
677 switch(escseq.arg[0]) {
678 case 0: /* right */
679 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
680 break;
681 case 1: /* left */
682 tclearregion(0, term.c.y, term.c.x, term.c.y);
683 break;
684 case 2: /* all */
685 tclearregion(0, term.c.y, term.col-1, term.c.y);
686 break;
687 }
688 break;
689 case 'S': /* SU -- Scroll <n> line up */
690 DEFAULT(escseq.arg[0], 1);
691 tscrollup(escseq.arg[0]);
692 break;
693 case 'T': /* SD -- Scroll <n> line down */
694 DEFAULT(escseq.arg[0], 1);
695 tscrolldown(escseq.arg[0]);
696 break;
697 case 'L': /* IL -- Insert <n> blank lines */
698 DEFAULT(escseq.arg[0], 1);
699 tinsertblankline(escseq.arg[0]);
700 break;
701 case 'l': /* RM -- Reset Mode */
702 if(escseq.priv) {
703 switch(escseq.arg[0]) {
704 case 1:
705 term.mode &= ~MODE_APPKEYPAD;
706 break;
707 case 7:
708 term.mode &= ~MODE_WRAP;
709 break;
710 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
711 break;
712 case 25:
713 term.c.state |= CURSOR_HIDE;
714 break;
715 case 1048: /* XXX: no alt. screen to erase/save */
716 case 1049:
717 tcursor(CURSOR_LOAD);
718 tclearregion(0, 0, term.col-1, term.row-1);
719 break;
720 default:
721 goto unknown;
722 }
723 } else {
724 switch(escseq.arg[0]) {
725 case 4:
726 term.mode &= ~MODE_INSERT;
727 break;
728 default:
729 goto unknown;
730 }
731 }
732 break;
733 case 'M': /* DL -- Delete <n> lines */
734 DEFAULT(escseq.arg[0], 1);
735 tdeleteline(escseq.arg[0]);
736 break;
737 case 'X': /* ECH -- Erase <n> char */
738 DEFAULT(escseq.arg[0], 1);
739 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
740 break;
741 case 'P': /* DCH -- Delete <n> char */
742 DEFAULT(escseq.arg[0], 1);
743 tdeletechar(escseq.arg[0]);
744 break;
745 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
746 case 'd': /* VPA -- Move to <row> */
747 DEFAULT(escseq.arg[0], 1);
748 tmoveto(term.c.x, escseq.arg[0]-1);
749 break;
750 case 'h': /* SM -- Set terminal mode */
751 if(escseq.priv) {
752 switch(escseq.arg[0]) {
753 case 1:
754 term.mode |= MODE_APPKEYPAD;
755 break;
756 case 7:
757 term.mode |= MODE_WRAP;
758 break;
759 case 12: /* att610 -- Start blinking cursor (IGNORED) */
760 break;
761 case 25:
762 term.c.state &= ~CURSOR_HIDE;
763 break;
764 case 1048:
765 case 1049: /* XXX: no alt. screen to erase/save */
766 tcursor(CURSOR_SAVE);
767 tclearregion(0, 0, term.col-1, term.row-1);
768 break;
769 default: goto unknown;
770 }
771 } else {
772 switch(escseq.arg[0]) {
773 case 4:
774 term.mode |= MODE_INSERT;
775 break;
776 default: goto unknown;
777 }
778 };
779 break;
780 case 'm': /* SGR -- Terminal attribute (color) */
781 tsetattr(escseq.arg, escseq.narg);
782 break;
783 case 'r': /* DECSTBM -- Set Scrolling Region */
784 if(escseq.priv)
785 goto unknown;
786 else {
787 DEFAULT(escseq.arg[0], 1);
788 DEFAULT(escseq.arg[1], term.row);
789 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
790 tmoveto(0, 0);
791 }
792 break;
793 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
794 tcursor(CURSOR_SAVE);
795 break;
796 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
797 tcursor(CURSOR_LOAD);
798 break;
799 }
800 }
801
802 void
803 csidump(void) {
804 int i;
805 printf("ESC [ %s", escseq.priv ? "? " : "");
806 if(escseq.narg)
807 for(i = 0; i < escseq.narg; i++)
808 printf("%d ", escseq.arg[i]);
809 if(escseq.mode)
810 putchar(escseq.mode);
811 putchar('\n');
812 }
813
814 void
815 csireset(void) {
816 memset(&escseq, 0, sizeof(escseq));
817 }
818
819 void
820 tputtab(void) {
821 int space = TAB - term.c.x % TAB;
822 tmoveto(term.c.x + space, term.c.y);
823 }
824
825 void
826 tputc(char c) {
827 if(term.esc & ESC_START) {
828 if(term.esc & ESC_CSI) {
829 escseq.buf[escseq.len++] = c;
830 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
831 term.esc = 0;
832 csiparse(), csihandle();
833 }
834 } else if(term.esc & ESC_OSC) {
835 if(c == ';') {
836 term.titlelen = 0;
837 term.esc = ESC_START | ESC_TITLE;
838 }
839 } else if(term.esc & ESC_TITLE) {
840 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
841 term.esc = 0;
842 term.title[term.titlelen] = '\0';
843 XStoreName(xw.dis, xw.win, term.title);
844 } else {
845 term.title[term.titlelen++] = c;
846 }
847 } else if(term.esc & ESC_ALTCHARSET) {
848 switch(c) {
849 case '0': /* Line drawing crap */
850 term.c.attr.mode |= ATTR_GFX;
851 break;
852 case 'B': /* Back to regular text */
853 term.c.attr.mode &= ~ATTR_GFX;
854 break;
855 default:
856 printf("esc unhandled charset: ESC ( %c\n", c);
857 }
858 term.esc = 0;
859 } else {
860 switch(c) {
861 case '[':
862 term.esc |= ESC_CSI;
863 break;
864 case ']':
865 term.esc |= ESC_OSC;
866 break;
867 case '(':
868 term.esc |= ESC_ALTCHARSET;
869 break;
870 case 'D': /* IND -- Linefeed */
871 if(term.c.y == term.bot)
872 tscrollup(1);
873 else
874 tmoveto(term.c.x, term.c.y+1);
875 term.esc = 0;
876 break;
877 case 'E': /* NEL -- Next line */
878 tnewline();
879 term.esc = 0;
880 break;
881 case 'M': /* RI -- Reverse index */
882 if(term.c.y == term.top)
883 tscrolldown(1);
884 else
885 tmoveto(term.c.x, term.c.y-1);
886 term.esc = 0;
887 break;
888 case 'c': /* RIS -- Reset to inital state */
889 treset();
890 term.esc = 0;
891 break;
892 case '=': /* DECPAM */
893 term.mode |= MODE_APPKEYPAD;
894 term.esc = 0;
895 break;
896 case '>': /* DECPNM */
897 term.mode &= ~MODE_APPKEYPAD;
898 term.esc = 0;
899 break;
900 case '7':
901 tcursor(CURSOR_SAVE);
902 term.esc = 0;
903 break;
904 case '8':
905 tcursor(CURSOR_LOAD);
906 term.esc = 0;
907 break;
908 default:
909 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
910 term.esc = 0;
911 }
912 }
913 } else {
914 switch(c) {
915 case '\t':
916 tputtab();
917 break;
918 case '\b':
919 tmoveto(term.c.x-1, term.c.y);
920 break;
921 case '\r':
922 tmoveto(0, term.c.y);
923 break;
924 case '\n':
925 tnewline();
926 break;
927 case '\a':
928 if(!xw.hasfocus)
929 xseturgency(1);
930 break;
931 case '\033':
932 csireset();
933 term.esc = ESC_START;
934 break;
935 default:
936 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
937 tnewline();
938 tsetchar(c);
939 if(term.c.x+1 < term.col)
940 tmoveto(term.c.x+1, term.c.y);
941 else
942 term.c.state |= CURSOR_WRAPNEXT;
943 break;
944 }
945 }
946 }
947
948 void
949 tputs(char *s, int len) {
950 for(; len > 0; len--)
951 tputc(*s++);
952 }
953
954 void
955 tresize(int col, int row) {
956 int i;
957 int minrow = MIN(row, term.row);
958 int mincol = MIN(col, term.col);
959
960 if(col < 1 || row < 1)
961 return;
962
963 /* free uneeded rows */
964 for(i = row; i < term.row; i++)
965 free(term.line[i]);
966
967 /* resize to new height */
968 term.line = realloc(term.line, row * sizeof(Line));
969
970 /* resize each row to new width, zero-pad if needed */
971 for(i = 0; i < minrow; i++) {
972 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
973 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
974 }
975
976 /* allocate any new rows */
977 for(/* i == minrow */; i < row; i++)
978 term.line[i] = calloc(col, sizeof(Glyph));
979
980 /* update terminal size */
981 term.col = col, term.row = row;
982 /* make use of the LIMIT in tmoveto */
983 tmoveto(term.c.x, term.c.y);
984 /* reset scrolling region */
985 tsetscroll(0, row-1);
986 }
987
988 void
989 xloadcols(void) {
990 int i, r, g, b;
991 XColor color;
992 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
993 unsigned long white = WhitePixel(xw.dis, xw.scr);
994
995 for(i = 0; i < 16; i++) {
996 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
997 dc.col[i] = white;
998 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
999 } else
1000 dc.col[i] = color.pixel;
1001 }
1002
1003 /* same colors as xterm */
1004 for(r = 0; r < 6; r++)
1005 for(g = 0; g < 6; g++)
1006 for(b = 0; b < 6; b++) {
1007 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1008 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1009 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1010 if (!XAllocColor(xw.dis, cmap, &color)) {
1011 dc.col[i] = white;
1012 fprintf(stderr, "Could not allocate color %d\n", i);
1013 } else
1014 dc.col[i] = color.pixel;
1015 i++;
1016 }
1017
1018 for(r = 0; r < 24; r++, i++) {
1019 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1020 if (!XAllocColor(xw.dis, cmap, &color)) {
1021 dc.col[i] = white;
1022 fprintf(stderr, "Could not allocate color %d\n", i);
1023 } else
1024 dc.col[i] = color.pixel;
1025 }
1026 }
1027
1028 void
1029 xclear(int x1, int y1, int x2, int y2) {
1030 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1031 XFillRectangle(xw.dis, xw.buf, dc.gc,
1032 x1 * xw.cw, y1 * xw.ch,
1033 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1034 }
1035
1036 void
1037 xhints(void)
1038 {
1039 XClassHint class = {TNAME, TNAME};
1040 XWMHints wm = {.flags = InputHint, .input = 1};
1041 XSizeHints size = {
1042 .flags = PSize | PResizeInc | PBaseSize,
1043 .height = xw.h,
1044 .width = xw.w,
1045 .height_inc = xw.ch,
1046 .width_inc = xw.cw,
1047 .base_height = 2*BORDER,
1048 .base_width = 2*BORDER,
1049 };
1050 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1051 }
1052
1053 void
1054 xinit(void) {
1055 if(!(xw.dis = XOpenDisplay(NULL)))
1056 die("Can't open display\n");
1057 xw.scr = XDefaultScreen(xw.dis);
1058
1059 /* font */
1060 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1061 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1062
1063 /* XXX: Assuming same size for bold font */
1064 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1065 xw.ch = dc.font->ascent + dc.font->descent;
1066
1067 /* colors */
1068 xloadcols();
1069
1070 /* windows */
1071 xw.h = term.row * xw.ch + 2*BORDER;
1072 xw.w = term.col * xw.cw + 2*BORDER;
1073 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1074 xw.w, xw.h, 0,
1075 dc.col[DefaultBG],
1076 dc.col[DefaultBG]);
1077 xw.bufw = xw.w - 2*BORDER;
1078 xw.bufh = xw.h - 2*BORDER;
1079 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1080 /* gc */
1081 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1082 XMapWindow(xw.dis, xw.win);
1083 xhints();
1084 XStoreName(xw.dis, xw.win, "st");
1085 XSync(xw.dis, 0);
1086 }
1087
1088 void
1089 xdraws(char *s, Glyph base, int x, int y, int len) {
1090 unsigned long xfg, xbg;
1091 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1092 int i;
1093
1094 if(base.mode & ATTR_REVERSE)
1095 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1096 else
1097 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1098
1099 XSetBackground(xw.dis, dc.gc, xbg);
1100 XSetForeground(xw.dis, dc.gc, xfg);
1101
1102 if(base.mode & ATTR_GFX)
1103 for(i = 0; i < len; i++)
1104 s[i] = gfx[(int)s[i]];
1105
1106 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1107 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1108
1109 if(base.mode & ATTR_UNDERLINE)
1110 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1111 }
1112
1113 void
1114 xdrawcursor(void) {
1115 static int oldx = 0;
1116 static int oldy = 0;
1117 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1118
1119 LIMIT(oldx, 0, term.col-1);
1120 LIMIT(oldy, 0, term.row-1);
1121
1122 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1123 g.c = term.line[term.c.y][term.c.x].c;
1124
1125 /* remove the old cursor */
1126 if(term.line[oldy][oldx].state & GLYPH_SET)
1127 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1128 else
1129 xclear(oldx, oldy, oldx, oldy);
1130
1131 /* draw the new one */
1132 if(!(term.c.state & CURSOR_HIDE)) {
1133 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1134 oldx = term.c.x, oldy = term.c.y;
1135 }
1136 }
1137
1138 #ifdef DEBUG
1139 /* basic drawing routines */
1140 void
1141 xdrawc(int x, int y, Glyph g) {
1142 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1143 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1144 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1145 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1146 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1147 }
1148
1149 void
1150 draw(int dummy) {
1151 int x, y;
1152
1153 xclear(0, 0, term.col-1, term.row-1);
1154 for(y = 0; y < term.row; y++)
1155 for(x = 0; x < term.col; x++)
1156 if(term.line[y][x].state & GLYPH_SET)
1157 xdrawc(x, y, term.line[y][x]);
1158
1159 xdrawcursor();
1160 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1161 XFlush(xw.dis);
1162 }
1163
1164 #else
1165 /* optimized drawing routine */
1166 void
1167 draw(int redraw_all) {
1168 int i, x, y, ox;
1169 Glyph base, new;
1170 char buf[DRAW_BUF_SIZ];
1171
1172 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1173 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
1174 for(y = 0; y < term.row; y++) {
1175 base = term.line[y][0];
1176 i = ox = 0;
1177 for(x = 0; x < term.col; x++) {
1178 new = term.line[y][x];
1179 if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1180 i >= DRAW_BUF_SIZ)) {
1181 xdraws(buf, base, ox, y, i);
1182 i = 0;
1183 }
1184 if(new.state & GLYPH_SET) {
1185 if(i == 0) {
1186 ox = x;
1187 base = new;
1188 }
1189 buf[i++] = new.c;
1190 }
1191 }
1192 if(i > 0)
1193 xdraws(buf, base, ox, y, i);
1194 }
1195 xdrawcursor();
1196 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1197 XFlush(xw.dis);
1198 }
1199
1200 #endif
1201
1202 void
1203 expose(XEvent *ev) {
1204 draw(SCREEN_REDRAW);
1205 }
1206
1207 void
1208 xseturgency(int add) {
1209 XWMHints *h = XGetWMHints(xw.dis, xw.win);
1210 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1211 XSetWMHints(xw.dis, xw.win, h);
1212 XFree(h);
1213 }
1214
1215 void
1216 focus(XEvent *ev) {
1217 if((xw.hasfocus = ev->type == FocusIn))
1218 xseturgency(0);
1219 }
1220
1221 char*
1222 kmap(KeySym k) {
1223 int i;
1224 for(i = 0; i < LEN(key); i++)
1225 if(key[i].k == k)
1226 return (char*)key[i].s;
1227 return NULL;
1228 }
1229
1230 void
1231 kpress(XEvent *ev) {
1232 XKeyEvent *e = &ev->xkey;
1233 KeySym ksym;
1234 char buf[32];
1235 char *customkey;
1236 int len;
1237 int meta;
1238 int shift;
1239
1240 meta = e->state & Mod1Mask;
1241 shift = e->state & ShiftMask;
1242 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1243
1244 if((customkey = kmap(ksym)))
1245 ttywrite(customkey, strlen(customkey));
1246 else if(len > 0) {
1247 buf[sizeof(buf)-1] = '\0';
1248 if(meta && len == 1)
1249 ttywrite("\033", 1);
1250 ttywrite(buf, len);
1251 } else
1252 switch(ksym) {
1253 case XK_Up:
1254 case XK_Down:
1255 case XK_Left:
1256 case XK_Right:
1257 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1258 ttywrite(buf, 3);
1259 break;
1260 case XK_Insert:
1261 if(shift)
1262 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1263 break;
1264 default:
1265 fprintf(stderr, "errkey: %d\n", (int)ksym);
1266 break;
1267 }
1268 }
1269
1270 void
1271 resize(XEvent *e) {
1272 int col, row;
1273
1274 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1275 return;
1276
1277 xw.w = e->xconfigure.width;
1278 xw.h = e->xconfigure.height;
1279 xw.bufw = xw.w - 2*BORDER;
1280 xw.bufh = xw.h - 2*BORDER;
1281 col = xw.bufw / xw.cw;
1282 row = xw.bufh / xw.ch;
1283 tresize(col, row);
1284 ttyresize(col, row);
1285 XFreePixmap(xw.dis, xw.buf);
1286 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1287 draw(SCREEN_REDRAW);
1288 }
1289
1290 void
1291 run(void) {
1292 XEvent ev;
1293 fd_set rfd;
1294 int xfd = XConnectionNumber(xw.dis);
1295 long mask = ExposureMask | KeyPressMask | StructureNotifyMask | FocusChangeMask;
1296
1297 XSelectInput(xw.dis, xw.win, mask);
1298 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1299
1300 while(1) {
1301 FD_ZERO(&rfd);
1302 FD_SET(cmdfd, &rfd);
1303 FD_SET(xfd, &rfd);
1304 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1305 if(errno == EINTR)
1306 continue;
1307 die("select failed: %s\n", SERRNO);
1308 }
1309 if(FD_ISSET(cmdfd, &rfd)) {
1310 ttyread();
1311 draw(SCREEN_UPDATE);
1312 }
1313 while(XPending(xw.dis)) {
1314 XNextEvent(xw.dis, &ev);
1315 if(handler[ev.type])
1316 (handler[ev.type])(&ev);
1317 }
1318 }
1319 }
1320
1321 int
1322 main(int argc, char *argv[]) {
1323 if(argc == 2 && !strncmp("-v", argv[1], 3))
1324 die("st-" VERSION ", (c) 2010 st engineers\n");
1325 else if(argc != 1)
1326 die("usage: st [-v]\n");
1327 setlocale(LC_CTYPE, "");
1328 tnew(80, 24);
1329 ttynew();
1330 xinit();
1331 run();
1332 return 0;
1333 }