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9b77a0b6fe0710d2f075bb20dda948e61af5430f
[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, CURSOR_HIDE, CURSOR_DRAW,
50 CURSOR_SAVE, CURSOR_LOAD };
51 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
52 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
53 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
54 enum { SCREEN_UPDATE, SCREEN_REDRAW };
55
56 typedef struct {
57 char c; /* character code */
58 char mode; /* attribute flags */
59 int fg; /* foreground */
60 int bg; /* background */
61 char state; /* state flags */
62 } Glyph;
63
64 typedef Glyph* Line;
65
66 typedef struct {
67 Glyph attr; /* current char attributes */
68 int x;
69 int y;
70 char hide;
71 } TCursor;
72
73 /* CSI Escape sequence structs */
74 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
75 typedef struct {
76 char buf[ESC_BUF_SIZ]; /* raw string */
77 int len; /* raw string length */
78 char priv;
79 int arg[ESC_ARG_SIZ];
80 int narg; /* nb of args */
81 char mode;
82 } CSIEscape;
83
84 /* Internal representation of the screen */
85 typedef struct {
86 int row; /* nb row */
87 int col; /* nb col */
88 Line* line; /* screen */
89 TCursor c; /* cursor */
90 int top; /* top scroll limit */
91 int bot; /* bottom scroll limit */
92 int mode; /* terminal mode flags */
93 int esc; /* escape state flags */
94 char title[ESC_TITLE_SIZ];
95 int titlelen;
96 } Term;
97
98 /* Purely graphic info */
99 typedef struct {
100 Display* dis;
101 Window win;
102 Pixmap buf;
103 int scr;
104 int w; /* window width */
105 int h; /* window height */
106 int bufw; /* pixmap width */
107 int bufh; /* pixmap height */
108 int ch; /* char height */
109 int cw; /* char width */
110 } XWindow;
111
112 typedef struct {
113 KeySym k;
114 char s[ESC_BUF_SIZ];
115 } Key;
116
117 /* Drawing Context */
118 typedef struct {
119 unsigned long col[256];
120 XFontStruct* font;
121 XFontStruct* bfont;
122 GC gc;
123 } DC;
124
125 #include "config.h"
126
127 static void die(const char *errstr, ...);
128 static void draw(int);
129 static void execsh(void);
130 static void sigchld(int);
131 static void run(void);
132
133 static void csidump(void);
134 static void csihandle(void);
135 static void csiparse(void);
136 static void csireset(void);
137
138 static void tclearregion(int, int, int, int);
139 static void tcursor(int);
140 static void tdeletechar(int);
141 static void tdeleteline(int);
142 static void tinsertblank(int);
143 static void tinsertblankline(int);
144 static void tmoveto(int, int);
145 static void tnew(int, int);
146 static void tnewline(void);
147 static void tputtab(void);
148 static void tputc(char);
149 static void tputs(char*, int);
150 static void treset(void);
151 static void tresize(int, int);
152 static void tscrollup(int);
153 static void tscrolldown(int);
154 static void tsetattr(int*, int);
155 static void tsetchar(char);
156 static void tsetscroll(int, int);
157
158 static void ttynew(void);
159 static void ttyread(void);
160 static void ttyresize(int, int);
161 static void ttywrite(const char *, size_t);
162
163 static void xbell(void);
164 static void xdraws(char *, Glyph, int, int, int);
165 static void xhints(void);
166 static void xclear(int, int, int, int);
167 static void xcursor(int);
168 static void xinit(void);
169 static void xloadcols(void);
170
171 static void expose(XEvent *);
172 static char* kmap(KeySym);
173 static void kpress(XEvent *);
174 static void resize(XEvent *);
175
176 static void (*handler[LASTEvent])(XEvent *) = {
177 [KeyPress] = kpress,
178 [Expose] = expose,
179 [ConfigureNotify] = resize
180 };
181
182 /* Globals */
183 static DC dc;
184 static XWindow xw;
185 static Term term;
186 static CSIEscape escseq;
187 static int cmdfd;
188 static pid_t pid;
189 static int running;
190
191 #ifdef DEBUG
192 void
193 tdump(void) {
194 int row, col;
195 Glyph c;
196
197 for(row = 0; row < term.row; row++) {
198 for(col = 0; col < term.col; col++) {
199 if(col == term.c.x && row == term.c.y)
200 putchar('#');
201 else {
202 c = term.line[row][col];
203 putchar(c.state & GLYPH_SET ? c.c : '.');
204 }
205 }
206 putchar('\n');
207 }
208 }
209 #endif
210
211 void
212 die(const char *errstr, ...) {
213 va_list ap;
214
215 va_start(ap, errstr);
216 vfprintf(stderr, errstr, ap);
217 va_end(ap);
218 exit(EXIT_FAILURE);
219 }
220
221 void
222 execsh(void) {
223 char *args[3] = {getenv("SHELL"), "-i", NULL};
224 DEFAULT(args[0], "/bin/sh"); /* if getenv() failed */
225 putenv("TERM=" TNAME);
226 execvp(args[0], args);
227 }
228
229 void
230 xbell(void) {
231 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
232 XFillRectangle(xw.dis, xw.win, dc.gc, BORDER, BORDER, xw.bufw, xw.bufh);
233 usleep(BellTime);
234 draw(SCREEN_REDRAW);
235 }
236
237 void
238 sigchld(int a) {
239 int stat = 0;
240 if(waitpid(pid, &stat, 0) < 0)
241 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
242 if(WIFEXITED(stat))
243 exit(WEXITSTATUS(stat));
244 else
245 exit(EXIT_FAILURE);
246 }
247
248 void
249 ttynew(void) {
250 int m, s;
251
252 /* seems to work fine on linux, openbsd and freebsd */
253 struct winsize w = {term.row, term.col, 0, 0};
254 if(openpty(&m, &s, NULL, NULL, &w) < 0)
255 die("openpty failed: %s\n", SERRNO);
256
257 switch(pid = fork()) {
258 case -1:
259 die("fork failed\n");
260 break;
261 case 0:
262 setsid(); /* create a new process group */
263 dup2(s, STDIN_FILENO);
264 dup2(s, STDOUT_FILENO);
265 dup2(s, STDERR_FILENO);
266 if(ioctl(s, TIOCSCTTY, NULL) < 0)
267 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
268 close(s);
269 close(m);
270 execsh();
271 break;
272 default:
273 close(s);
274 cmdfd = m;
275 signal(SIGCHLD, sigchld);
276 }
277 }
278
279 void
280 dump(char c) {
281 static int col;
282 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
283 if(++col % 10 == 0)
284 fprintf(stderr, "\n");
285 }
286
287 void
288 ttyread(void) {
289 char buf[BUFSIZ] = {0};
290 int ret;
291
292 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
293 die("Couldn't read from shell: %s\n", SERRNO);
294 else
295 tputs(buf, ret);
296 }
297
298 void
299 ttywrite(const char *s, size_t n) {
300 if(write(cmdfd, s, n) == -1)
301 die("write error on tty: %s\n", SERRNO);
302 }
303
304 void
305 ttyresize(int x, int y) {
306 struct winsize w;
307
308 w.ws_row = term.row;
309 w.ws_col = term.col;
310 w.ws_xpixel = w.ws_ypixel = 0;
311 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
312 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
313 }
314
315 void
316 tcursor(int mode) {
317 static TCursor c;
318
319 if(mode == CURSOR_SAVE)
320 c = term.c;
321 else if(mode == CURSOR_LOAD)
322 term.c = c, tmoveto(c.x, c.y);
323 }
324
325 void
326 treset(void) {
327 term.c = (TCursor){{
328 .mode = ATTR_NULL,
329 .fg = DefaultFG,
330 .bg = DefaultBG
331 }, .x = 0, .y = 0, .hide = 0};
332
333 term.top = 0, term.bot = term.row - 1;
334 term.mode = MODE_WRAP;
335 tclearregion(0, 0, term.col-1, term.row-1);
336 }
337
338 void
339 tnew(int col, int row) {
340 /* set screen size */
341 term.row = row, term.col = col;
342 term.line = malloc(term.row * sizeof(Line));
343 for(row = 0 ; row < term.row; row++)
344 term.line[row] = malloc(term.col * sizeof(Glyph));
345 /* setup screen */
346 treset();
347 }
348
349 void
350 tscrolldown (int n) {
351 int i;
352 Line temp;
353
354 LIMIT(n, 0, term.bot-term.top+1);
355
356 for(i = 0; i < n; i++)
357 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
358
359 for(i = term.bot; i >= term.top+n; i--) {
360 temp = term.line[i];
361 term.line[i] = term.line[i-n];
362 term.line[i-n] = temp;
363 }
364 }
365
366 void
367 tscrollup (int n) {
368 int i;
369 Line temp;
370 LIMIT(n, 0, term.bot-term.top+1);
371
372 for(i = 0; i < n; i++)
373 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
374
375 for(i = term.top; i <= term.bot-n; i++) {
376 temp = term.line[i];
377 term.line[i] = term.line[i+n];
378 term.line[i+n] = temp;
379 }
380 }
381
382 void
383 tnewline(void) {
384 int y = term.c.y + 1;
385 if(y > term.bot)
386 tscrollup(1), y = term.bot;
387 tmoveto(0, y);
388 }
389
390 void
391 csiparse(void) {
392 /* int noarg = 1; */
393 char *p = escseq.buf;
394
395 escseq.narg = 0;
396 if(*p == '?')
397 escseq.priv = 1, p++;
398
399 while(p < escseq.buf+escseq.len) {
400 while(isdigit(*p)) {
401 escseq.arg[escseq.narg] *= 10;
402 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
403 }
404 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
405 escseq.narg++, p++;
406 else {
407 escseq.mode = *p;
408 escseq.narg++;
409 return;
410 }
411 }
412 }
413
414 void
415 tmoveto(int x, int y) {
416 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
417 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : 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.hide = 1;
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.hide = 0;
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 }
791 break;
792 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
793 tcursor(CURSOR_SAVE);
794 break;
795 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
796 tcursor(CURSOR_LOAD);
797 break;
798 }
799 }
800
801 void
802 csidump(void) {
803 int i;
804 printf("ESC [ %s", escseq.priv ? "? " : "");
805 if(escseq.narg)
806 for(i = 0; i < escseq.narg; i++)
807 printf("%d ", escseq.arg[i]);
808 if(escseq.mode)
809 putchar(escseq.mode);
810 putchar('\n');
811 }
812
813 void
814 csireset(void) {
815 memset(&escseq, 0, sizeof(escseq));
816 }
817
818 void
819 tputtab(void) {
820 int space = TAB - term.c.x % TAB;
821 tmoveto(term.c.x + space, term.c.y);
822 }
823
824 void
825 tputc(char c) {
826 if(term.esc & ESC_START) {
827 if(term.esc & ESC_CSI) {
828 escseq.buf[escseq.len++] = c;
829 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
830 term.esc = 0;
831 csiparse(), csihandle();
832 }
833 } else if(term.esc & ESC_OSC) {
834 if(c == ';') {
835 term.titlelen = 0;
836 term.esc = ESC_START | ESC_TITLE;
837 }
838 } else if(term.esc & ESC_TITLE) {
839 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
840 term.esc = 0;
841 term.title[term.titlelen] = '\0';
842 XStoreName(xw.dis, xw.win, term.title);
843 } else {
844 term.title[term.titlelen++] = c;
845 }
846 } else if(term.esc & ESC_ALTCHARSET) {
847 switch(c) {
848 case '0': /* Line drawing crap */
849 term.c.attr.mode |= ATTR_GFX;
850 break;
851 case 'B': /* Back to regular text */
852 term.c.attr.mode &= ~ATTR_GFX;
853 break;
854 default:
855 printf("esc unhandled charset: ESC ( %c\n", c);
856 }
857 term.esc = 0;
858 } else {
859 switch(c) {
860 case '[':
861 term.esc |= ESC_CSI;
862 break;
863 case ']':
864 term.esc |= ESC_OSC;
865 break;
866 case '(':
867 term.esc |= ESC_ALTCHARSET;
868 break;
869 case 'A':
870 tmoveto(term.c.x, term.c.y-1);
871 term.esc = 0;
872 break;
873 case 'B':
874 tmoveto(term.c.x, term.c.y+1);
875 term.esc = 0;
876 break;
877 case 'C':
878 tmoveto(term.c.x+1, term.c.y);
879 term.esc = 0;
880 break;
881 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
882 tmoveto(term.c.x-1, term.c.y);
883 term.esc = 0;
884 break;
885 case 'E': /* NEL -- Next line */
886 tnewline();
887 term.esc = 0;
888 break;
889 case 'M': /* RI -- Reverse index */
890 if(term.c.y == term.top)
891 tscrolldown(1);
892 else
893 tmoveto(term.c.x, term.c.y-1);
894 term.esc = 0;
895 break;
896 case 'c': /* RIS -- Reset to inital state */
897 treset();
898 term.esc = 0;
899 break;
900 case '=': /* DECPAM */
901 term.mode |= MODE_APPKEYPAD;
902 term.esc = 0;
903 break;
904 case '>': /* DECPNM */
905 term.mode &= ~MODE_APPKEYPAD;
906 term.esc = 0;
907 break;
908 case '7':
909 tcursor(CURSOR_SAVE);
910 term.esc = 0;
911 break;
912 case '8':
913 tcursor(CURSOR_LOAD);
914 term.esc = 0;
915 break;
916 default:
917 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
918 term.esc = 0;
919 }
920 }
921 } else {
922 switch(c) {
923 case '\t':
924 tputtab();
925 break;
926 case '\b':
927 tmoveto(term.c.x-1, term.c.y);
928 break;
929 case '\r':
930 tmoveto(0, term.c.y);
931 break;
932 case '\n':
933 tnewline();
934 break;
935 case '\a':
936 xbell();
937 break;
938 case '\033':
939 csireset();
940 term.esc = ESC_START;
941 break;
942 default:
943 tsetchar(c);
944 if(term.c.x+1 < term.col) {
945 tmoveto(term.c.x+1, term.c.y);
946 } else if(IS_SET(MODE_WRAP))
947 tnewline();
948 break;
949 }
950 }
951 }
952
953 void
954 tputs(char *s, int len) {
955 for(; len > 0; len--)
956 tputc(*s++);
957 }
958
959 void
960 tresize(int col, int row) {
961 int i;
962 int minrow = MIN(row, term.row);
963 int mincol = MIN(col, term.col);
964
965 if(col < 1 || row < 1)
966 return;
967
968 /* free uneeded rows */
969 for(i = row; i < term.row; i++)
970 free(term.line[i]);
971
972 /* resize to new height */
973 term.line = realloc(term.line, row * sizeof(Line));
974
975 /* resize each row to new width, zero-pad if needed */
976 for(i = 0; i < minrow; i++) {
977 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
978 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
979 }
980
981 /* allocate any new rows */
982 for(/* i == minrow */; i < row; i++)
983 term.line[i] = calloc(col, sizeof(Glyph));
984
985 LIMIT(term.c.x, 0, col-1);
986 LIMIT(term.c.y, 0, row-1);
987 LIMIT(term.top, 0, row-1);
988 LIMIT(term.bot, 0, row-1);
989
990 term.bot = row-1;
991 term.col = col, term.row = row;
992 }
993
994 void
995 xloadcols(void) {
996 int i, r, g, b;
997 XColor color;
998 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
999 unsigned long white = WhitePixel(xw.dis, xw.scr);
1000
1001 for(i = 0; i < 16; i++) {
1002 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1003 dc.col[i] = white;
1004 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1005 } else
1006 dc.col[i] = color.pixel;
1007 }
1008
1009 /* same colors as xterm */
1010 for(r = 0; r < 6; r++)
1011 for(g = 0; g < 6; g++)
1012 for(b = 0; b < 6; b++) {
1013 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1014 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1015 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1016 if (!XAllocColor(xw.dis, cmap, &color)) {
1017 dc.col[i] = white;
1018 fprintf(stderr, "Could not allocate color %d\n", i);
1019 } else
1020 dc.col[i] = color.pixel;
1021 i++;
1022 }
1023
1024 for(r = 0; r < 24; r++, i++) {
1025 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1026 if (!XAllocColor(xw.dis, cmap, &color)) {
1027 dc.col[i] = white;
1028 fprintf(stderr, "Could not allocate color %d\n", i);
1029 } else
1030 dc.col[i] = color.pixel;
1031 }
1032 }
1033
1034 void
1035 xclear(int x1, int y1, int x2, int y2) {
1036 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1037 XFillRectangle(xw.dis, xw.buf, dc.gc,
1038 x1 * xw.cw, y1 * xw.ch,
1039 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1040 }
1041
1042 void
1043 xhints(void)
1044 {
1045 XClassHint class = {TNAME, TNAME};
1046 XWMHints wm = {.flags = InputHint, .input = 1};
1047 XSizeHints size = {
1048 .flags = PSize | PResizeInc | PBaseSize,
1049 .height = xw.h,
1050 .width = xw.w,
1051 .height_inc = xw.ch,
1052 .width_inc = xw.cw,
1053 .base_height = 2*BORDER,
1054 .base_width = 2*BORDER,
1055 };
1056 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1057 }
1058
1059 void
1060 xinit(void) {
1061 if(!(xw.dis = XOpenDisplay(NULL)))
1062 die("Can't open display\n");
1063 xw.scr = XDefaultScreen(xw.dis);
1064
1065 /* font */
1066 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1067 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1068
1069 /* XXX: Assuming same size for bold font */
1070 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1071 xw.ch = dc.font->ascent + dc.font->descent;
1072
1073 /* colors */
1074 xloadcols();
1075
1076 term.c.attr.fg = DefaultFG;
1077 term.c.attr.bg = DefaultBG;
1078 term.c.attr.mode = ATTR_NULL;
1079 /* windows */
1080 xw.h = term.row * xw.ch + 2*BORDER;
1081 xw.w = term.col * xw.cw + 2*BORDER;
1082 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1083 xw.w, xw.h, 0,
1084 dc.col[DefaultBG],
1085 dc.col[DefaultBG]);
1086 xw.bufw = xw.w - 2*BORDER;
1087 xw.bufh = xw.h - 2*BORDER;
1088 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1089 /* gc */
1090 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1091 XMapWindow(xw.dis, xw.win);
1092 xhints();
1093 XStoreName(xw.dis, xw.win, "st");
1094 XSync(xw.dis, 0);
1095 }
1096
1097 void
1098 xdraws(char *s, Glyph base, int x, int y, int len) {
1099 unsigned long xfg, xbg;
1100 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1101 int i;
1102
1103 if(base.mode & ATTR_REVERSE)
1104 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1105 else
1106 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1107
1108 XSetBackground(xw.dis, dc.gc, xbg);
1109 XSetForeground(xw.dis, dc.gc, xfg);
1110
1111 if(base.mode & ATTR_GFX)
1112 for(i = 0; i < len; i++)
1113 s[i] = gfx[(int)s[i]];
1114
1115 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1116 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1117
1118 if(base.mode & ATTR_UNDERLINE)
1119 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1120 }
1121
1122 void
1123 xcursor(int mode) {
1124 static int oldx = 0;
1125 static int oldy = 0;
1126 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1127
1128 LIMIT(oldx, 0, term.col-1);
1129 LIMIT(oldy, 0, term.row-1);
1130
1131 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1132 g.c = term.line[term.c.y][term.c.x].c;
1133
1134 /* remove the old cursor */
1135 if(term.line[oldy][oldx].state & GLYPH_SET)
1136 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1137 else
1138 xclear(oldx, oldy, oldx, oldy);
1139
1140 /* draw the new one */
1141 if(mode == CURSOR_DRAW) {
1142 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1143 oldx = term.c.x, oldy = term.c.y;
1144 }
1145 }
1146
1147 #ifdef DEBUG
1148 /* basic drawing routines */
1149 void
1150 xdrawc(int x, int y, Glyph g) {
1151 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1152 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1153 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1154 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1155 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1156 }
1157
1158 void
1159 draw(int dummy) {
1160 int x, y;
1161
1162 xclear(0, 0, term.col-1, term.row-1);
1163 for(y = 0; y < term.row; y++)
1164 for(x = 0; x < term.col; x++)
1165 if(term.line[y][x].state & GLYPH_SET)
1166 xdrawc(x, y, term.line[y][x]);
1167
1168 if(!term.c.hide)
1169 xcursor(CURSOR_DRAW);
1170 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1171 XFlush(xw.dis);
1172 }
1173
1174 #else
1175 /* optimized drawing routine */
1176 void
1177 draw(int redraw_all) {
1178 int i, x, y, ox;
1179 Glyph base, new;
1180 char buf[DRAW_BUF_SIZ];
1181
1182 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1183 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1184 for(y = 0; y < term.row; y++) {
1185 base = term.line[y][0];
1186 i = ox = 0;
1187 for(x = 0; x < term.col; x++) {
1188 new = term.line[y][x];
1189 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1190 buf[i++] = new.c;
1191 else {
1192 xdraws(buf, base, ox, y, i);
1193 buf[0] = new.c;
1194 i = 1;
1195 ox = x;
1196 base = new;
1197 }
1198 }
1199 xdraws(buf, base, ox, y, i);
1200 }
1201 xcursor(term.c.hide ? CURSOR_HIDE : CURSOR_DRAW);
1202 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1203 XFlush(xw.dis);
1204 }
1205
1206 #endif
1207
1208 void
1209 expose(XEvent *ev) {
1210 draw(SCREEN_REDRAW);
1211 }
1212
1213 char*
1214 kmap(KeySym k) {
1215 int i;
1216 for(i = 0; i < LEN(key); i++)
1217 if(key[i].k == k)
1218 return (char*)key[i].s;
1219 return NULL;
1220 }
1221
1222 void
1223 kpress(XEvent *ev) {
1224 XKeyEvent *e = &ev->xkey;
1225 KeySym ksym;
1226 char buf[32];
1227 char *customkey;
1228 int len;
1229 int meta;
1230 int shift;
1231
1232 meta = e->state & Mod1Mask;
1233 shift = e->state & ShiftMask;
1234 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1235
1236 if((customkey = kmap(ksym)))
1237 ttywrite(customkey, strlen(customkey));
1238 else if(len > 0) {
1239 buf[sizeof(buf)-1] = '\0';
1240 if(meta && len == 1)
1241 ttywrite("\033", 1);
1242 ttywrite(buf, len);
1243 } else
1244 switch(ksym) {
1245 case XK_Up:
1246 case XK_Down:
1247 case XK_Left:
1248 case XK_Right:
1249 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1250 ttywrite(buf, 3);
1251 break;
1252 case XK_Insert:
1253 if(shift)
1254 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1255 break;
1256 default:
1257 fprintf(stderr, "errkey: %d\n", (int)ksym);
1258 break;
1259 }
1260 }
1261
1262 void
1263 resize(XEvent *e) {
1264 int col, row;
1265
1266 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1267 return;
1268
1269 xw.w = e->xconfigure.width;
1270 xw.h = e->xconfigure.height;
1271 xw.bufw = xw.w - 2*BORDER;
1272 xw.bufh = xw.h - 2*BORDER;
1273 col = xw.bufw / xw.cw;
1274 row = xw.bufh / xw.ch;
1275 tresize(col, row);
1276 ttyresize(col, row);
1277 XFreePixmap(xw.dis, xw.buf);
1278 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1279 draw(SCREEN_REDRAW);
1280 }
1281
1282 void
1283 run(void) {
1284 XEvent ev;
1285 fd_set rfd;
1286 int xfd = XConnectionNumber(xw.dis);
1287
1288 running = 1;
1289 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1290 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1291
1292 while(running) {
1293 FD_ZERO(&rfd);
1294 FD_SET(cmdfd, &rfd);
1295 FD_SET(xfd, &rfd);
1296 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1297 if(errno == EINTR)
1298 continue;
1299 die("select failed: %s\n", SERRNO);
1300 }
1301 if(FD_ISSET(cmdfd, &rfd)) {
1302 ttyread();
1303 draw(SCREEN_UPDATE);
1304 }
1305 while(XPending(xw.dis)) {
1306 XNextEvent(xw.dis, &ev);
1307 if(handler[ev.type])
1308 (handler[ev.type])(&ev);
1309 }
1310 }
1311 }
1312
1313 int
1314 main(int argc, char *argv[]) {
1315 if(argc == 2 && !strncmp("-v", argv[1], 3))
1316 die("st-" VERSION ", (c) 2010 st engineers\n");
1317 else if(argc != 1)
1318 die("usage: st [-v]\n");
1319 setlocale(LC_CTYPE, "");
1320 tnew(80, 24);
1321 ttynew();
1322 xinit();
1323 run();
1324 return 0;
1325 }