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fixed background color bug (thx Devin J. Pohly).
[st.git] / st.c
1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <locale.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/ioctl.h>
14 #include <sys/select.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <X11/Xlib.h>
20 #include <X11/keysym.h>
21 #include <X11/Xutil.h>
22
23 #define TNAME "xterm"
24
25 /* Arbitrary sizes */
26 #define ESC_TITLE_SIZ 256
27 #define ESC_BUF_SIZ 256
28 #define ESC_ARG_SIZ 16
29 #define DRAW_BUF_SIZ 1024
30
31 #define SERRNO strerror(errno)
32 #define MIN(a, b) ((a) < (b) ? (a) : (b))
33 #define MAX(a, b) ((a) < (b) ? (b) : (a))
34 #define LEN(a) (sizeof(a) / sizeof(a[0]))
35 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
36 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
37 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
38 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
39
40 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
41 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
42 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
43 CURSOR_SAVE, CURSOR_LOAD };
44 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
45 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
46 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
47 enum { SCREEN_UPDATE, SCREEN_REDRAW };
48
49 typedef struct {
50 char c; /* character code */
51 char mode; /* attribute flags */
52 int fg; /* foreground */
53 int bg; /* background */
54 char state; /* state flags */
55 } Glyph;
56
57 typedef Glyph* Line;
58
59 typedef struct {
60 Glyph attr; /* current char attributes */
61 int x;
62 int y;
63 } TCursor;
64
65 /* CSI Escape sequence structs */
66 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
67 typedef struct {
68 char buf[ESC_BUF_SIZ]; /* raw string */
69 int len; /* raw string length */
70 char priv;
71 int arg[ESC_ARG_SIZ];
72 int narg; /* nb of args */
73 char mode;
74 } CSIEscape;
75
76 /* Internal representation of the screen */
77 typedef struct {
78 int row; /* nb row */
79 int col; /* nb col */
80 Line* line; /* screen */
81 TCursor c; /* cursor */
82 char hidec;
83 int top; /* top scroll limit */
84 int bot; /* bottom scroll limit */
85 int mode; /* terminal mode flags */
86 int esc; /* escape state flags */
87 char title[ESC_TITLE_SIZ];
88 int titlelen;
89 } Term;
90
91 /* Purely graphic info */
92 typedef struct {
93 Display* dis;
94 Window win;
95 Pixmap buf;
96 int scr;
97 int w; /* window width */
98 int h; /* window height */
99 int bufw; /* pixmap width */
100 int bufh; /* pixmap height */
101 int ch; /* char height */
102 int cw; /* char width */
103 } XWindow;
104
105 typedef struct {
106 KeySym k;
107 char s[ESC_BUF_SIZ];
108 } Key;
109
110 #include "config.h"
111
112 /* Drawing Context */
113 typedef struct {
114 unsigned long col[LEN(colorname)];
115 XFontStruct* font;
116 XFontStruct* bfont;
117 GC gc;
118 } DC;
119
120 static void die(const char *errstr, ...);
121 static void draw(int);
122 static void execsh(void);
123 static void sigchld(int);
124 static void run(void);
125
126 static void csidump(void);
127 static void csihandle(void);
128 static void csiparse(void);
129 static void csireset(void);
130
131 static void tclearregion(int, int, int, int);
132 static void tcursor(int);
133 static void tmovecursor(int);
134 static void tdeletechar(int);
135 static void tdeleteline(int);
136 static void tinsertblank(int);
137 static void tinsertblankline(int);
138 static void tmoveto(int, int);
139 static void tnew(int, int);
140 static void tnewline(void);
141 static void tputc(char);
142 static void tputs(char*, int);
143 static void treset(void);
144 static void tresize(int, int);
145 static void tscroll(void);
146 static void tscrollup(int);
147 static void tscrolldown(int);
148 static void tsetattr(int*, int);
149 static void tsetchar(char);
150 static void tsetscroll(int, int);
151
152 static void ttynew(void);
153 static void ttyread(void);
154 static void ttyresize(int, int);
155 static void ttywrite(const char *, size_t);
156
157 static unsigned long xgetcol(const char *);
158 static void xclear(int, int, int, int);
159 static void xcursor(int);
160 static void xinit(void);
161
162 static void expose(XEvent *);
163 static char* kmap(KeySym);
164 static void kpress(XEvent *);
165 static void resize(XEvent *);
166
167 static void (*handler[LASTEvent])(XEvent *) = {
168 [KeyPress] = kpress,
169 [Expose] = expose,
170 [ConfigureNotify] = resize
171 };
172
173 /* Globals */
174 static DC dc;
175 static XWindow xw;
176 static Term term;
177 static CSIEscape escseq;
178 static int cmdfd;
179 static pid_t pid;
180 static int running;
181
182 #ifdef DEBUG
183 void
184 tdump(void) {
185 int row, col;
186 Glyph c;
187
188 for(row = 0; row < term.row; row++) {
189 for(col = 0; col < term.col; col++) {
190 if(col == term.c.x && row == term.c.y)
191 putchar('#');
192 else {
193 c = term.line[row][col];
194 putchar(c.state & GLYPH_SET ? c.c : '.');
195 }
196 }
197 putchar('\n');
198 }
199 }
200 #endif
201
202 void
203 die(const char *errstr, ...) {
204 va_list ap;
205
206 va_start(ap, errstr);
207 vfprintf(stderr, errstr, ap);
208 va_end(ap);
209 exit(EXIT_FAILURE);
210 }
211
212 void
213 execsh(void) {
214 char *args[3] = {getenv("SHELL"), "-i", NULL};
215 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
216 putenv("TERM=" TNAME);
217 execvp(args[0], args);
218 }
219
220 void
221 xbell(void) { /* visual bell */
222 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
223 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
224 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
225 /* usleep(30000); */
226 draw(SCREEN_REDRAW);
227 }
228
229 void
230 sigchld(int a) {
231 int stat = 0;
232 if(waitpid(pid, &stat, 0) < 0)
233 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
234 if(WIFEXITED(stat))
235 exit(WEXITSTATUS(stat));
236 else
237 exit(EXIT_FAILURE);
238 }
239
240 void
241 ttynew(void) {
242 int m, s;
243 char *pts;
244
245 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
246 die("openpt failed: %s\n", SERRNO);
247 if(grantpt(m) < 0)
248 die("grandpt failed: %s\n", SERRNO);
249 if(unlockpt(m) < 0)
250 die("unlockpt failed: %s\n", SERRNO);
251 if(!(pts = ptsname(m)))
252 die("ptsname failed: %s\n", SERRNO);
253 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
254 die("Couldn't open slave: %s\n", SERRNO);
255 fcntl(s, F_SETFL, O_NDELAY);
256 switch(pid = fork()) {
257 case -1:
258 die("fork failed\n");
259 break;
260 case 0:
261 setsid(); /* create a new process group */
262 dup2(s, STDIN_FILENO);
263 dup2(s, STDOUT_FILENO);
264 dup2(s, STDERR_FILENO);
265 if(ioctl(s, TIOCSCTTY, NULL) < 0)
266 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
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.attr.mode = ATTR_NULL;
325 term.c.attr.fg = DefaultFG;
326 term.c.attr.bg = DefaultBG;
327 term.c.x = term.c.y = 0;
328 term.hidec = 0;
329 term.top = 0, term.bot = term.row - 1;
330 term.mode = MODE_WRAP;
331 tclearregion(0, 0, term.col-1, term.row-1);
332 }
333
334 void
335 tnew(int col, int row) { /* screen size */
336 term.row = row, term.col = col;
337 term.top = 0, term.bot = term.row - 1;
338 /* mode */
339 term.mode = MODE_WRAP;
340 /* cursor */
341 term.c.attr.mode = ATTR_NULL;
342 term.c.attr.fg = DefaultFG;
343 term.c.attr.bg = DefaultBG;
344 term.c.x = term.c.y = 0;
345 term.hidec = 0;
346 /* allocate screen */
347 term.line = calloc(term.row, sizeof(Line));
348 for(row = 0 ; row < term.row; row++)
349 term.line[row] = calloc(term.col, sizeof(Glyph));
350 }
351
352 /* TODO: Replace with scrollup/scolldown */
353 void
354 tscroll(void) {
355 Line temp = term.line[term.top];
356 int i;
357
358 for(i = term.top; i < term.bot; i++)
359 term.line[i] = term.line[i+1];
360 memset(temp, 0, sizeof(Glyph) * term.col);
361 term.line[term.bot] = temp;
362 }
363
364 void
365 tscrolldown (int n) {
366 int i;
367 Line temp;
368
369 LIMIT(n, 0, term.bot-term.top+1);
370
371 for(i = 0; i < n; i++)
372 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
373
374 for(i = term.bot; i >= term.top+n; i--) {
375 temp = term.line[i];
376 term.line[i] = term.line[i-n];
377 term.line[i-n] = temp;
378 }
379 }
380
381 void
382 tscrollup (int n) {
383 int i;
384 Line temp;
385 LIMIT(n, 0, term.bot-term.top+1);
386
387 for(i = 0; i < n; i++)
388 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
389
390 for(i = term.top; i <= term.bot-n; i++) {
391 temp = term.line[i];
392 term.line[i] = term.line[i+n];
393 term.line[i+n] = temp;
394 }
395 }
396
397 void
398 tnewline(void) {
399 int y = term.c.y + 1;
400 if(y > term.bot)
401 tscroll(), y = term.bot;
402 tmoveto(0, y);
403 }
404
405 void
406 csiparse(void) {
407 /* int noarg = 1; */
408 char *p = escseq.buf;
409
410 escseq.narg = 0;
411 if(*p == '?')
412 escseq.priv = 1, p++;
413
414 while(p < escseq.buf+escseq.len) {
415 while(isdigit(*p)) {
416 escseq.arg[escseq.narg] *= 10;
417 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
418 }
419 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
420 escseq.narg++, p++;
421 else {
422 escseq.mode = *p;
423 escseq.narg++;
424 return;
425 }
426 }
427 }
428
429 void
430 tmoveto(int x, int y) {
431 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
432 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
433 }
434
435 void
436 tmovecursor(int dir) {
437 int xf = term.c.x, yf = term.c.y;
438
439 switch(dir) {
440 case CURSOR_UP:
441 yf--;
442 break;
443 case CURSOR_DOWN:
444 yf++;
445 break;
446 case CURSOR_LEFT:
447 xf--;
448 if(term.mode & MODE_WRAP && xf < 0) {
449 xf = term.col-1, yf--;
450 if(yf < term.top)
451 yf = term.top, xf = 0;
452 }
453 break;
454 case CURSOR_RIGHT:
455 xf++;
456 if(term.mode & MODE_WRAP && xf >= term.col) {
457 xf = 0, yf++;
458 if(yf > term.bot)
459 yf = term.bot, tscroll();
460 }
461 break;
462 }
463 tmoveto(xf, yf);
464 }
465
466 void
467 tsetchar(char c) {
468 term.line[term.c.y][term.c.x] = term.c.attr;
469 term.line[term.c.y][term.c.x].c = c;
470 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
471 }
472
473 void
474 tclearregion(int x1, int y1, int x2, int y2) {
475 int y, temp;
476
477 if(x1 > x2)
478 temp = x1, x1 = x2, x2 = temp;
479 if(y1 > y2)
480 temp = y1, y1 = y2, y2 = temp;
481
482 LIMIT(x1, 0, term.col-1);
483 LIMIT(x2, 0, term.col-1);
484 LIMIT(y1, 0, term.row-1);
485 LIMIT(y2, 0, term.row-1);
486
487 for(y = y1; y <= y2; y++)
488 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
489 }
490
491 void
492 tdeletechar(int n) {
493 int src = term.c.x + n;
494 int dst = term.c.x;
495 int size = term.col - src;
496
497 if(src >= term.col) {
498 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
499 return;
500 }
501 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
502 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
503 }
504
505 void
506 tinsertblank(int n) {
507 int src = term.c.x;
508 int dst = src + n;
509 int size = term.col - n - src;
510
511 if(dst >= term.col) {
512 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
513 return;
514 }
515 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
516 tclearregion(src, term.c.y, dst, term.c.y);
517 }
518
519 void
520 tinsertblankline(int n) {
521 int i;
522 Line blank;
523 int bot = term.bot;
524
525 if(term.c.y > term.bot)
526 bot = term.row - 1;
527 else if(term.c.y < term.top)
528 bot = term.top - 1;
529 if(term.c.y + n >= bot) {
530 tclearregion(0, term.c.y, term.col-1, bot);
531 return;
532 }
533 for(i = bot; i >= term.c.y+n; i--) {
534 /* swap deleted line <-> blanked line */
535 blank = term.line[i];
536 term.line[i] = term.line[i-n];
537 term.line[i-n] = blank;
538 /* blank it */
539 memset(blank, 0, term.col * sizeof(Glyph));
540 }
541 }
542
543 void
544 tdeleteline(int n) {
545 int i;
546 Line blank;
547 int bot = term.bot;
548
549 if(term.c.y > term.bot)
550 bot = term.row - 1;
551 else if(term.c.y < term.top)
552 bot = term.top - 1;
553 if(term.c.y + n >= bot) {
554 tclearregion(0, term.c.y, term.col-1, bot);
555 return;
556 }
557 for(i = term.c.y; i <= bot-n; i++) {
558 /* swap deleted line <-> blanked line */
559 blank = term.line[i];
560 term.line[i] = term.line[i+n];
561 term.line[i+n] = blank;
562 /* blank it */
563 memset(blank, 0, term.col * sizeof(Glyph));
564 }
565 }
566
567 void
568 tsetattr(int *attr, int l) {
569 int i;
570
571 for(i = 0; i < l; i++) {
572 switch(attr[i]) {
573 case 0:
574 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
575 term.c.attr.fg = DefaultFG;
576 term.c.attr.bg = DefaultBG;
577 break;
578 case 1:
579 term.c.attr.mode |= ATTR_BOLD;
580 break;
581 case 4:
582 term.c.attr.mode |= ATTR_UNDERLINE;
583 break;
584 case 7:
585 term.c.attr.mode |= ATTR_REVERSE;
586 break;
587 case 22:
588 term.c.attr.mode &= ~ATTR_BOLD;
589 break;
590 case 24:
591 term.c.attr.mode &= ~ATTR_UNDERLINE;
592 break;
593 case 27:
594 term.c.attr.mode &= ~ATTR_REVERSE;
595 break;
596 case 39:
597 term.c.attr.fg = DefaultFG;
598 break;
599 case 49:
600 term.c.attr.bg = DefaultBG;
601 break;
602 default:
603 if(BETWEEN(attr[i], 30, 37))
604 term.c.attr.fg = attr[i] - 30;
605 else if(BETWEEN(attr[i], 40, 47))
606 term.c.attr.bg = attr[i] - 40;
607 else
608 fprintf(stderr, "erresc: gfx attr %d unkown\n", attr[i]);
609 break;
610 }
611 }
612 }
613
614 void
615 tsetscroll(int t, int b) {
616 int temp;
617
618 LIMIT(t, 0, term.row-1);
619 LIMIT(b, 0, term.row-1);
620 if(t > b) {
621 temp = t;
622 t = b;
623 b = temp;
624 }
625 term.top = t;
626 term.bot = b;
627 }
628
629 void
630 csihandle(void) {
631 switch(escseq.mode) {
632 default:
633 unknown:
634 printf("erresc: unknown csi ");
635 csidump();
636 /* die(""); */
637 break;
638 case '@': /* ICH -- Insert <n> blank char */
639 DEFAULT(escseq.arg[0], 1);
640 tinsertblank(escseq.arg[0]);
641 break;
642 case 'A': /* CUU -- Cursor <n> Up */
643 case 'e':
644 DEFAULT(escseq.arg[0], 1);
645 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
646 break;
647 case 'B': /* CUD -- Cursor <n> Down */
648 DEFAULT(escseq.arg[0], 1);
649 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
650 break;
651 case 'C': /* CUF -- Cursor <n> Forward */
652 case 'a':
653 DEFAULT(escseq.arg[0], 1);
654 tmoveto(term.c.x+escseq.arg[0], term.c.y);
655 break;
656 case 'D': /* CUB -- Cursor <n> Backward */
657 DEFAULT(escseq.arg[0], 1);
658 tmoveto(term.c.x-escseq.arg[0], term.c.y);
659 break;
660 case 'E': /* CNL -- Cursor <n> Down and first col */
661 DEFAULT(escseq.arg[0], 1);
662 tmoveto(0, term.c.y+escseq.arg[0]);
663 break;
664 case 'F': /* CPL -- Cursor <n> Up and first col */
665 DEFAULT(escseq.arg[0], 1);
666 tmoveto(0, term.c.y-escseq.arg[0]);
667 break;
668 case 'G': /* CHA -- Move to <col> */
669 case '`': /* XXX: HPA -- same? */
670 DEFAULT(escseq.arg[0], 1);
671 tmoveto(escseq.arg[0]-1, term.c.y);
672 break;
673 case 'H': /* CUP -- Move to <row> <col> */
674 case 'f': /* XXX: HVP -- same? */
675 DEFAULT(escseq.arg[0], 1);
676 DEFAULT(escseq.arg[1], 1);
677 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
678 break;
679 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
680 case 'J': /* ED -- Clear screen */
681 switch(escseq.arg[0]) {
682 case 0: /* below */
683 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
684 break;
685 case 1: /* above */
686 tclearregion(0, 0, term.c.x, term.c.y);
687 break;
688 case 2: /* all */
689 tclearregion(0, 0, term.col-1, term.row-1);
690 break;
691 case 3: /* XXX: erase saved lines (xterm) */
692 default:
693 goto unknown;
694 }
695 break;
696 case 'K': /* EL -- Clear line */
697 switch(escseq.arg[0]) {
698 case 0: /* right */
699 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
700 break;
701 case 1: /* left */
702 tclearregion(0, term.c.y, term.c.x, term.c.y);
703 break;
704 case 2: /* all */
705 tclearregion(0, term.c.y, term.col-1, term.c.y);
706 break;
707 }
708 break;
709 case 'S': /* SU -- Scroll <n> line up */
710 DEFAULT(escseq.arg[0], 1);
711 tscrollup(escseq.arg[0]);
712 break;
713 case 'T': /* SD -- Scroll <n> line down */
714 DEFAULT(escseq.arg[0], 1);
715 tscrolldown(escseq.arg[0]);
716 break;
717 case 'L': /* IL -- Insert <n> blank lines */
718 DEFAULT(escseq.arg[0], 1);
719 tinsertblankline(escseq.arg[0]);
720 break;
721 case 'l': /* RM -- Reset Mode */
722 if(escseq.priv) {
723 switch(escseq.arg[0]) {
724 case 1:
725 term.mode &= ~MODE_APPKEYPAD;
726 break;
727 case 7:
728 term.mode &= ~MODE_WRAP;
729 break;
730 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
731 break;
732 case 25:
733 term.hidec = 1;
734 break;
735 case 1048: /* XXX: no alt. screen to erase/save */
736 case 1049:
737 tcursor(CURSOR_LOAD);
738 tclearregion(0, 0, term.col-1, term.row-1);
739 break;
740 default:
741 goto unknown;
742 }
743 } else {
744 switch(escseq.arg[0]) {
745 case 4:
746 term.mode &= ~MODE_INSERT;
747 break;
748 default:
749 goto unknown;
750 }
751 }
752 break;
753 case 'M': /* DL -- Delete <n> lines */
754 DEFAULT(escseq.arg[0], 1);
755 tdeleteline(escseq.arg[0]);
756 break;
757 case 'X': /* ECH -- Erase <n> char */
758 DEFAULT(escseq.arg[0], 1);
759 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
760 break;
761 case 'P': /* DCH -- Delete <n> char */
762 DEFAULT(escseq.arg[0], 1);
763 tdeletechar(escseq.arg[0]);
764 break;
765 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
766 case 'd': /* VPA -- Move to <row> */
767 DEFAULT(escseq.arg[0], 1);
768 tmoveto(term.c.x, escseq.arg[0]-1);
769 break;
770 case 'h': /* SM -- Set terminal mode */
771 if(escseq.priv) {
772 switch(escseq.arg[0]) {
773 case 1:
774 term.mode |= MODE_APPKEYPAD;
775 break;
776 case 7:
777 term.mode |= MODE_WRAP;
778 break;
779 case 12: /* att610 -- Start blinking cursor (IGNORED) */
780 break;
781 case 25:
782 term.hidec = 0;
783 break;
784 case 1048:
785 case 1049: /* XXX: no alt. screen to erase/save */
786 tcursor(CURSOR_SAVE);
787 tclearregion(0, 0, term.col-1, term.row-1);
788 break;
789 default: goto unknown;
790 }
791 } else {
792 switch(escseq.arg[0]) {
793 case 4:
794 term.mode |= MODE_INSERT;
795 break;
796 default: goto unknown;
797 }
798 };
799 break;
800 case 'm': /* SGR -- Terminal attribute (color) */
801 tsetattr(escseq.arg, escseq.narg);
802 break;
803 case 'r': /* DECSTBM -- Set Scrolling Region */
804 if(escseq.priv)
805 goto unknown;
806 else {
807 DEFAULT(escseq.arg[0], 1);
808 DEFAULT(escseq.arg[1], term.row);
809 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
810 }
811 break;
812 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
813 tcursor(CURSOR_SAVE);
814 break;
815 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
816 tcursor(CURSOR_LOAD);
817 break;
818 }
819 }
820
821 void
822 csidump(void) {
823 int i;
824 printf("ESC [ %s", escseq.priv ? "? " : "");
825 if(escseq.narg)
826 for(i = 0; i < escseq.narg; i++)
827 printf("%d ", escseq.arg[i]);
828 if(escseq.mode)
829 putchar(escseq.mode);
830 putchar('\n');
831 }
832
833 void
834 csireset(void) {
835 memset(&escseq, 0, sizeof(escseq));
836 }
837
838 void
839 tputtab(void) {
840 int space = TAB - term.c.x % TAB;
841
842 if(term.c.x + space >= term.col)
843 space--;
844
845 for(; space > 0; space--)
846 tmovecursor(CURSOR_RIGHT);
847 }
848
849 void
850 tputc(char c) {
851 if(term.esc & ESC_START) {
852 if(term.esc & ESC_CSI) {
853 escseq.buf[escseq.len++] = c;
854 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
855 term.esc = 0;
856 csiparse(), csihandle();
857 }
858 } else if(term.esc & ESC_OSC) {
859 if(c == ';') {
860 term.titlelen = 0;
861 term.esc = ESC_START | ESC_TITLE;
862 }
863 } else if(term.esc & ESC_TITLE) {
864 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
865 term.esc = 0;
866 term.title[term.titlelen] = '\0';
867 XStoreName(xw.dis, xw.win, term.title);
868 } else {
869 term.title[term.titlelen++] = c;
870 }
871 } else if(term.esc & ESC_ALTCHARSET) {
872 switch(c) {
873 case '0': /* Line drawing crap */
874 term.c.attr.mode |= ATTR_GFX;
875 break;
876 case 'B': /* Back to regular text */
877 term.c.attr.mode &= ~ATTR_GFX;
878 break;
879 default:
880 printf("esc unhandled charset: ESC ( %c\n", c);
881 }
882 term.esc = 0;
883 } else {
884 switch(c) {
885 case '[':
886 term.esc |= ESC_CSI;
887 break;
888 case ']':
889 term.esc |= ESC_OSC;
890 break;
891 case '(':
892 term.esc |= ESC_ALTCHARSET;
893 break;
894 case 'A':
895 tmoveto(term.c.x, term.c.y-1);
896 term.esc = 0;
897 break;
898 case 'B':
899 tmoveto(term.c.x, term.c.y+1);
900 term.esc = 0;
901 break;
902 case 'C':
903 tmoveto(term.c.x+1, term.c.y);
904 term.esc = 0;
905 break;
906 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
907 tmoveto(term.c.x-1, term.c.y);
908 term.esc = 0;
909 break;
910 case 'E': /* NEL -- Next line */
911 tnewline();
912 term.esc = 0;
913 break;
914 case 'M': /* RI -- Reverse index */
915 if(term.c.y == term.top)
916 tscrolldown(1);
917 else
918 tmoveto(term.c.x, term.c.y-1);
919 term.esc = 0;
920 break;
921 case 'c': /* RIS -- Reset to inital state */
922 treset();
923 term.esc = 0;
924 break;
925 case '=': /* DECPAM */
926 term.mode |= MODE_APPKEYPAD;
927 term.esc = 0;
928 break;
929 case '>': /* DECPNM */
930 term.mode &= ~MODE_APPKEYPAD;
931 term.esc = 0;
932 break;
933 case '7':
934 tcursor(CURSOR_SAVE);
935 term.esc = 0;
936 break;
937 case '8':
938 tcursor(CURSOR_LOAD);
939 term.esc = 0;
940 break;
941 default:
942 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
943 term.esc = 0;
944 }
945 }
946 } else {
947 switch(c) {
948 case '\t':
949 tputtab();
950 break;
951 case '\b':
952 tmovecursor(CURSOR_LEFT);
953 break;
954 case '\r':
955 tmoveto(0, term.c.y);
956 break;
957 case '\n':
958 tnewline();
959 break;
960 case '\a':
961 xbell();
962 break;
963 case '\033':
964 csireset();
965 term.esc = ESC_START;
966 break;
967 default:
968 tsetchar(c);
969 tmovecursor(CURSOR_RIGHT);
970 break;
971 }
972 }
973 }
974
975 void
976 tputs(char *s, int len) {
977 for(; len > 0; len--)
978 tputc(*s++);
979 }
980
981 void
982 tresize(int col, int row) {
983 int i;
984 Line *line;
985 int minrow = MIN(row, term.row);
986 int mincol = MIN(col, term.col);
987
988 if(col < 1 || row < 1)
989 return;
990 /* alloc */
991 line = calloc(row, sizeof(Line));
992 for(i = 0 ; i < row; i++)
993 line[i] = calloc(col, sizeof(Glyph));
994 /* copy */
995 for(i = 0 ; i < minrow; i++)
996 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
997 /* free */
998 for(i = 0; i < term.row; i++)
999 free(term.line[i]);
1000 free(term.line);
1001
1002 LIMIT(term.c.x, 0, col-1);
1003 LIMIT(term.c.y, 0, row-1);
1004 LIMIT(term.top, 0, row-1);
1005 LIMIT(term.bot, 0, row-1);
1006
1007 term.bot = row-1;
1008 term.line = line;
1009 term.col = col, term.row = row;
1010 }
1011
1012 unsigned long
1013 xgetcol(const char *s) {
1014 XColor color;
1015 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1016
1017 if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
1018 color.pixel = WhitePixel(xw.dis, xw.scr);
1019 fprintf(stderr, "Could not allocate color '%s'\n", s);
1020 }
1021 return color.pixel;
1022 }
1023
1024 void
1025 xclear(int x1, int y1, int x2, int y2) {
1026 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1027 XFillRectangle(xw.dis, xw.buf, dc.gc,
1028 x1 * xw.cw, y1 * xw.ch,
1029 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1030 }
1031
1032 void
1033 xhints(void)
1034 {
1035 XClassHint class = {TNAME, TNAME};
1036 XWMHints wm = {.flags = InputHint, .input = 1};
1037 XSizeHints size = {
1038 .flags = PSize | PResizeInc | PBaseSize,
1039 .height = xw.h,
1040 .width = xw.w,
1041 .height_inc = xw.ch,
1042 .width_inc = xw.cw,
1043 .base_height = 2*BORDER,
1044 .base_width = 2*BORDER,
1045 };
1046 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1047 }
1048
1049 void
1050 xinit(void) {
1051 int i;
1052
1053 xw.dis = XOpenDisplay(NULL);
1054 xw.scr = XDefaultScreen(xw.dis);
1055 if(!xw.dis)
1056 die("Can't open display\n");
1057
1058 /* font */
1059 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1060 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1061
1062 /* XXX: Assuming same size for bold font */
1063 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1064 xw.ch = dc.font->ascent + dc.font->descent;
1065
1066 /* colors */
1067 for(i = 0; i < LEN(colorname); i++)
1068 dc.col[i] = xgetcol(colorname[i]);
1069
1070 term.c.attr.fg = DefaultFG;
1071 term.c.attr.bg = DefaultBG;
1072 term.c.attr.mode = ATTR_NULL;
1073 /* windows */
1074 xw.h = term.row * xw.ch + 2*BORDER;
1075 xw.w = term.col * xw.cw + 2*BORDER;
1076 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1077 xw.w, xw.h, 0,
1078 dc.col[DefaultBG],
1079 dc.col[DefaultBG]);
1080 xw.bufw = xw.w - 2*BORDER;
1081 xw.bufh = xw.h - 2*BORDER;
1082 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1083 /* gc */
1084 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1085 XMapWindow(xw.dis, xw.win);
1086 xhints();
1087 XStoreName(xw.dis, xw.win, "st");
1088 XSync(xw.dis, 0);
1089 }
1090
1091 void
1092 xdraws(char *s, Glyph base, int x, int y, int len) {
1093 unsigned long xfg, xbg;
1094 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1095 int i;
1096
1097 if(base.mode & ATTR_REVERSE)
1098 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1099 else
1100 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1101
1102 XSetBackground(xw.dis, dc.gc, xbg);
1103 XSetForeground(xw.dis, dc.gc, xfg);
1104
1105 if(base.mode & ATTR_GFX)
1106 for(i = 0; i < len; i++)
1107 s[i] = gfx[s[i]];
1108
1109 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1110 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1111
1112 if(base.mode & ATTR_UNDERLINE)
1113 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1114 }
1115
1116 void
1117 xcursor(int mode) {
1118 static int oldx = 0;
1119 static int oldy = 0;
1120 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1121
1122 LIMIT(oldx, 0, term.col-1);
1123 LIMIT(oldy, 0, term.row-1);
1124
1125 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1126 g.c = term.line[term.c.y][term.c.x].c;
1127
1128 /* remove the old cursor */
1129 if(term.line[oldy][oldx].state & GLYPH_SET)
1130 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1131 else
1132 xclear(oldx, oldy, oldx, oldy);
1133
1134 /* draw the new one */
1135 if(mode == CURSOR_DRAW) {
1136 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1137 oldx = term.c.x, oldy = term.c.y;
1138 }
1139 }
1140
1141 #ifdef DEBUG
1142 /* basic drawing routines */
1143 void
1144 xdrawc(int x, int y, Glyph g) {
1145 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1146 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1147 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1148 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1149 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1150 }
1151
1152 void
1153 draw(int dummy) {
1154 int x, y;
1155
1156 xclear(0, 0, term.col-1, term.row-1);
1157 for(y = 0; y < term.row; y++)
1158 for(x = 0; x < term.col; x++)
1159 if(term.line[y][x].state & GLYPH_SET)
1160 xdrawc(x, y, term.line[y][x]);
1161
1162 if(!term.hidec)
1163 xcursor(CURSOR_DRAW);
1164 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1165 XFlush(xw.dis);
1166 }
1167
1168 #else
1169 /* optimized drawing routine */
1170 void
1171 draw(int redraw_all) {
1172 int i, x, y, ox;
1173 Glyph base, new;
1174 char buf[DRAW_BUF_SIZ];
1175
1176 for(y = 0; y < term.row; y++) {
1177 base = term.line[y][0];
1178 i = ox = 0;
1179 for(x = 0; x < term.col; x++) {
1180 new = term.line[y][x];
1181 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1182 buf[i++] = new.c;
1183 else {
1184 xdraws(buf, base, ox, y, i);
1185 buf[0] = new.c;
1186 i = 1;
1187 ox = x;
1188 base = new;
1189 }
1190 }
1191 xdraws(buf, base, ox, y, i);
1192 }
1193 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1194 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1195 XFlush(xw.dis);
1196 }
1197
1198 #endif
1199
1200 void
1201 expose(XEvent *ev) {
1202 draw(SCREEN_REDRAW);
1203 }
1204
1205 char*
1206 kmap(KeySym k) {
1207 int i;
1208 for(i = 0; i < LEN(key); i++)
1209 if(key[i].k == k)
1210 return (char*)key[i].s;
1211 return NULL;
1212 }
1213
1214 void
1215 kpress(XEvent *ev) {
1216 XKeyEvent *e = &ev->xkey;
1217 KeySym ksym;
1218 char buf[32];
1219 char *customkey;
1220 int len;
1221 int meta;
1222 int shift;
1223
1224 meta = e->state & Mod1Mask;
1225 shift = e->state & ShiftMask;
1226 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1227
1228 if(customkey = kmap(ksym))
1229 ttywrite(customkey, strlen(customkey));
1230 else if(len > 0) {
1231 buf[sizeof(buf)-1] = '\0';
1232 if(meta && len == 1)
1233 ttywrite("\033", 1);
1234 ttywrite(buf, len);
1235 } else
1236 switch(ksym) {
1237 case XK_Up:
1238 case XK_Down:
1239 case XK_Left:
1240 case XK_Right:
1241 sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1242 ttywrite(buf, 3);
1243 break;
1244 case XK_Insert:
1245 if(shift)
1246 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1247 break;
1248 default:
1249 fprintf(stderr, "errkey: %d\n", (int)ksym);
1250 break;
1251 }
1252 }
1253
1254 void
1255 resize(XEvent *e) {
1256 int col, row;
1257
1258 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1259 return;
1260
1261 xw.w = e->xconfigure.width;
1262 xw.h = e->xconfigure.height;
1263 xw.bufw = xw.w - 2*BORDER;
1264 xw.bufh = xw.h - 2*BORDER;
1265 col = xw.bufw / xw.cw;
1266 row = xw.bufh / xw.ch;
1267 tresize(col, row);
1268 ttyresize(col, row);
1269 XFreePixmap(xw.dis, xw.buf);
1270 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1271 draw(SCREEN_REDRAW);
1272 }
1273
1274 void
1275 run(void) {
1276 XEvent ev;
1277 fd_set rfd;
1278 int xfd = XConnectionNumber(xw.dis);
1279
1280 running = 1;
1281 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1282 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1283
1284 while(running) {
1285 FD_ZERO(&rfd);
1286 FD_SET(cmdfd, &rfd);
1287 FD_SET(xfd, &rfd);
1288 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1289 if(errno == EINTR)
1290 continue;
1291 die("select failed: %s\n", SERRNO);
1292 }
1293 if(FD_ISSET(cmdfd, &rfd)) {
1294 ttyread();
1295 draw(SCREEN_UPDATE);
1296 }
1297 while(XPending(xw.dis)) {
1298 XNextEvent(xw.dis, &ev);
1299 if(handler[ev.type])
1300 (handler[ev.type])(&ev);
1301 }
1302 }
1303 }
1304
1305 int
1306 main(int argc, char *argv[]) {
1307 if(argc == 2 && !strncmp("-v", argv[1], 3))
1308 die("st-" VERSION ", © 2009 st engineers\n");
1309 else if(argc != 1)
1310 die("usage: st [-v]\n");
1311 setlocale(LC_CTYPE, "");
1312 tnew(80, 24);
1313 ttynew();
1314 xinit();
1315 run();
1316 return 0;
1317 }