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deb161055009db9f6fd2dccb94b535fa648d9ecf
[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, CURSOR_SAVE, CURSOR_LOAD };
43 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
44 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
45 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
46 enum { SCREEN_UPDATE, SCREEN_REDRAW };
47
48 typedef struct {
49 char c; /* character code */
50 char mode; /* attribute flags */
51 int fg; /* foreground */
52 int bg; /* background */
53 char state; /* state flags */
54 } Glyph;
55
56 typedef Glyph* Line;
57
58 typedef struct {
59 Glyph attr; /* current char attributes */
60 int x;
61 int y;
62 } TCursor;
63
64 /* CSI Escape sequence structs */
65 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
66 typedef struct {
67 char buf[ESC_BUF_SIZ]; /* raw string */
68 int len; /* raw string length */
69 char priv;
70 int arg[ESC_ARG_SIZ];
71 int narg; /* nb of args */
72 char mode;
73 } CSIEscape;
74
75 /* Internal representation of the screen */
76 typedef struct {
77 int row; /* nb row */
78 int col; /* nb col */
79 Line* line; /* screen */
80 TCursor c; /* cursor */
81 char hidec;
82 int top; /* top scroll limit */
83 int bot; /* bottom scroll limit */
84 int mode; /* terminal mode flags */
85 int esc; /* escape state flags */
86 char title[ESC_TITLE_SIZ];
87 int titlelen;
88 } Term;
89
90 /* Purely graphic info */
91 typedef struct {
92 Display* dis;
93 Window win;
94 Pixmap buf;
95 int scr;
96 int w; /* window width */
97 int h; /* window height */
98 int ch; /* char height */
99 int cw; /* char width */
100 } XWindow;
101
102 typedef struct {
103 KeySym k;
104 char s[ESC_BUF_SIZ];
105 } Key;
106
107 #include "config.h"
108
109 /* Drawing Context */
110 typedef struct {
111 unsigned long col[LEN(colorname)];
112 XFontStruct* font;
113 XFontStruct* bfont;
114 GC gc;
115 } DC;
116
117 static void die(const char *errstr, ...);
118 static void draw(int);
119 static void execsh(void);
120 static void sigchld(int);
121 static void run(void);
122
123 static void csidump(void);
124 static void csihandle(void);
125 static void csiparse(void);
126 static void csireset(void);
127
128 static void tclearregion(int, int, int, int);
129 static void tcursor(int);
130 static void tmovecursor(int);
131 static void tdeletechar(int);
132 static void tdeleteline(int);
133 static void tinsertblank(int);
134 static void tinsertblankline(int);
135 static void tmoveto(int, int);
136 static void tnew(int, int);
137 static void tnewline(void);
138 static void tputc(char);
139 static void tputs(char*, int);
140 static void treset(void);
141 static void tresize(int, int);
142 static void tscroll(void);
143 static void tscrollup(int);
144 static void tscrolldown(int);
145 static void tsetattr(int*, int);
146 static void tsetchar(char);
147 static void tsetscroll(int, int);
148
149 static void ttynew(void);
150 static void ttyread(void);
151 static void ttyresize(int, int);
152 static void ttywrite(const char *, size_t);
153
154 static unsigned long xgetcol(const char *);
155 static void xclear(int, int, int, int);
156 static void xcursor(int);
157 static void xinit(void);
158
159 static void expose(XEvent *);
160 static char* kmap(KeySym);
161 static void kpress(XEvent *);
162 static void resize(XEvent *);
163
164 static void (*handler[LASTEvent])(XEvent *) = {
165 [KeyPress] = kpress,
166 [Expose] = expose,
167 [ConfigureNotify] = resize
168 };
169
170 /* Globals */
171 static DC dc;
172 static XWindow xw;
173 static Term term;
174 static CSIEscape escseq;
175 static int cmdfd;
176 static pid_t pid;
177 static int running;
178
179 #ifdef DEBUG
180 void
181 tdump(void) {
182 int row, col;
183 Glyph c;
184
185 for(row = 0; row < term.row; row++) {
186 for(col = 0; col < term.col; col++) {
187 if(col == term.c.x && row == term.c.y)
188 putchar('#');
189 else {
190 c = term.line[row][col];
191 putchar(c.state & GLYPH_SET ? c.c : '.');
192 }
193 }
194 putchar('\n');
195 }
196 }
197 #endif
198
199 void
200 die(const char *errstr, ...) {
201 va_list ap;
202
203 va_start(ap, errstr);
204 vfprintf(stderr, errstr, ap);
205 va_end(ap);
206 exit(EXIT_FAILURE);
207 }
208
209 void
210 execsh(void) {
211 char *args[3] = {SHELL, "-i", NULL};
212 putenv("TERM=" TNAME);
213 execvp(SHELL, args);
214 }
215
216 void
217 xbell(void) { /* visual bell */
218 XRectangle r = { BORDER, BORDER, xw.w, xw.h };
219 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
220 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
221 /* usleep(30000); */
222 draw(SCREEN_REDRAW);
223 }
224
225 void
226 sigchld(int a) {
227 int stat = 0;
228 if(waitpid(pid, &stat, 0) < 0)
229 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
230 if(WIFEXITED(stat))
231 exit(WEXITSTATUS(stat));
232 else
233 exit(EXIT_FAILURE);
234 }
235
236 void
237 ttynew(void) {
238 int m, s;
239 char *pts;
240
241 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
242 die("openpt failed: %s\n", SERRNO);
243 if(grantpt(m) < 0)
244 die("grandpt failed: %s\n", SERRNO);
245 if(unlockpt(m) < 0)
246 die("unlockpt failed: %s\n", SERRNO);
247 if(!(pts = ptsname(m)))
248 die("ptsname failed: %s\n", SERRNO);
249 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
250 die("Couldn't open slave: %s\n", SERRNO);
251 fcntl(s, F_SETFL, O_NDELAY);
252 switch(pid = fork()) {
253 case -1:
254 die("fork failed\n");
255 break;
256 case 0:
257 setsid(); /* create a new process group */
258 dup2(s, STDIN_FILENO);
259 dup2(s, STDOUT_FILENO);
260 dup2(s, STDERR_FILENO);
261 if(ioctl(s, TIOCSCTTY, NULL) < 0)
262 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
263 execsh();
264 break;
265 default:
266 close(s);
267 cmdfd = m;
268 signal(SIGCHLD, sigchld);
269 }
270 }
271
272 void
273 dump(char c) {
274 static int col;
275 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
276 if(++col % 10 == 0)
277 fprintf(stderr, "\n");
278 }
279
280 void
281 ttyread(void) {
282 char buf[BUFSIZ] = {0};
283 int ret;
284
285 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
286 die("Couldn't read from shell: %s\n", SERRNO);
287 else
288 tputs(buf, ret);
289 }
290
291 void
292 ttywrite(const char *s, size_t n) {
293 if(write(cmdfd, s, n) == -1)
294 die("write error on tty: %s\n", SERRNO);
295 }
296
297 void
298 ttyresize(int x, int y) {
299 struct winsize w;
300
301 w.ws_row = term.row;
302 w.ws_col = term.col;
303 w.ws_xpixel = w.ws_ypixel = 0;
304 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
305 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
306 }
307
308 void
309 tcursor(int mode) {
310 static TCursor c;
311
312 if(mode == CURSOR_SAVE)
313 c = term.c;
314 else if(mode == CURSOR_LOAD)
315 term.c = c, tmoveto(c.x, c.y);
316 }
317
318 void
319 treset(void) {
320 term.c.attr.mode = ATTR_NULL;
321 term.c.attr.fg = DefaultFG;
322 term.c.attr.bg = DefaultBG;
323 term.c.x = term.c.y = 0;
324 term.hidec = 0;
325 term.top = 0, term.bot = term.row - 1;
326 term.mode = MODE_WRAP;
327 tclearregion(0, 0, term.col-1, term.row-1);
328 }
329
330 void
331 tnew(int col, int row) { /* screen size */
332 term.row = row, term.col = col;
333 term.top = 0, term.bot = term.row - 1;
334 /* mode */
335 term.mode = MODE_WRAP;
336 /* cursor */
337 term.c.attr.mode = ATTR_NULL;
338 term.c.attr.fg = DefaultFG;
339 term.c.attr.bg = DefaultBG;
340 term.c.x = term.c.y = 0;
341 term.hidec = 0;
342 /* allocate screen */
343 term.line = calloc(term.row, sizeof(Line));
344 for(row = 0 ; row < term.row; row++)
345 term.line[row] = calloc(term.col, sizeof(Glyph));
346 }
347
348 /* TODO: Replace with scrollup/scolldown */
349 void
350 tscroll(void) {
351 Line temp = term.line[term.top];
352 int i;
353
354 for(i = term.top; i < term.bot; i++)
355 term.line[i] = term.line[i+1];
356 memset(temp, 0, sizeof(Glyph) * term.col);
357 term.line[term.bot] = temp;
358 }
359
360 void
361 tscrolldown (int n) {
362 int i;
363 Line temp;
364
365 LIMIT(n, 0, term.bot-term.top+1);
366
367 for(i = 0; i < n; i++)
368 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
369
370 for(i = term.bot; i >= term.top+n; i--) {
371 temp = term.line[i];
372 term.line[i] = term.line[i-n];
373 term.line[i-n] = temp;
374 }
375 }
376
377 void
378 tscrollup (int n) {
379 int i;
380 Line temp;
381 LIMIT(n, 0, term.bot-term.top+1);
382
383 for(i = 0; i < n; i++)
384 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
385
386 for(i = term.top; i <= term.bot-n; i++) {
387 temp = term.line[i];
388 term.line[i] = term.line[i+n];
389 term.line[i+n] = temp;
390 }
391 }
392
393 void
394 tnewline(void) {
395 int y = term.c.y + 1;
396 if(y > term.bot)
397 tscroll(), y = term.bot;
398 tmoveto(0, y);
399 }
400
401 void
402 csiparse(void) {
403 /* int noarg = 1; */
404 char *p = escseq.buf;
405
406 escseq.narg = 0;
407 if(*p == '?')
408 escseq.priv = 1, p++;
409
410 while(p < escseq.buf+escseq.len) {
411 while(isdigit(*p)) {
412 escseq.arg[escseq.narg] *= 10;
413 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
414 }
415 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
416 escseq.narg++, p++;
417 else {
418 escseq.mode = *p;
419 escseq.narg++;
420 return;
421 }
422 }
423 }
424
425 void
426 tmoveto(int x, int y) {
427 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
428 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
429 }
430
431 void
432 tmovecursor(int dir) {
433 int xf = term.c.x, yf = term.c.y;
434
435 switch(dir) {
436 case CURSOR_UP:
437 yf--;
438 break;
439 case CURSOR_DOWN:
440 yf++;
441 break;
442 case CURSOR_LEFT:
443 xf--;
444 if(term.mode & MODE_WRAP && xf < 0) {
445 xf = term.col-1, yf--;
446 if(yf < term.top)
447 yf = term.top, xf = 0;
448 }
449 break;
450 case CURSOR_RIGHT:
451 xf++;
452 if(term.mode & MODE_WRAP && xf >= term.col) {
453 xf = 0, yf++;
454 if(yf > term.bot)
455 yf = term.bot, tscroll();
456 }
457 break;
458 }
459 tmoveto(xf, yf);
460 }
461
462 void
463 tsetchar(char c) {
464 term.line[term.c.y][term.c.x] = term.c.attr;
465 term.line[term.c.y][term.c.x].c = c;
466 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
467 }
468
469 void
470 tclearregion(int x1, int y1, int x2, int y2) {
471 int y, temp;
472
473 if(x1 > x2)
474 temp = x1, x1 = x2, x2 = temp;
475 if(y1 > y2)
476 temp = y1, y1 = y2, y2 = temp;
477
478 LIMIT(x1, 0, term.col-1);
479 LIMIT(x2, 0, term.col-1);
480 LIMIT(y1, 0, term.row-1);
481 LIMIT(y2, 0, term.row-1);
482
483 for(y = y1; y <= y2; y++)
484 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
485 }
486
487 void
488 tdeletechar(int n) {
489 int src = term.c.x + n;
490 int dst = term.c.x;
491 int size = term.col - src;
492
493 if(src >= term.col) {
494 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
495 return;
496 }
497 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
498 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
499 }
500
501 void
502 tinsertblank(int n) {
503 int src = term.c.x;
504 int dst = src + n;
505 int size = term.col - n - src;
506
507 if(dst >= term.col) {
508 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
509 return;
510 }
511 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
512 tclearregion(src, term.c.y, dst, term.c.y);
513 }
514
515 void
516 tinsertblankline(int n) {
517 int i;
518 Line blank;
519 int bot = term.bot;
520
521 if(term.c.y > term.bot)
522 bot = term.row - 1;
523 else if(term.c.y < term.top)
524 bot = term.top - 1;
525 if(term.c.y + n >= bot) {
526 tclearregion(0, term.c.y, term.col-1, bot);
527 return;
528 }
529 for(i = bot; i >= term.c.y+n; i--) {
530 /* swap deleted line <-> blanked line */
531 blank = term.line[i];
532 term.line[i] = term.line[i-n];
533 term.line[i-n] = blank;
534 /* blank it */
535 memset(blank, 0, term.col * sizeof(Glyph));
536 }
537 }
538
539 void
540 tdeleteline(int n) {
541 int i;
542 Line blank;
543 int bot = term.bot;
544
545 if(term.c.y > term.bot)
546 bot = term.row - 1;
547 else if(term.c.y < term.top)
548 bot = term.top - 1;
549 if(term.c.y + n >= bot) {
550 tclearregion(0, term.c.y, term.col-1, bot);
551 return;
552 }
553 for(i = term.c.y; i <= bot-n; i++) {
554 /* swap deleted line <-> blanked line */
555 blank = term.line[i];
556 term.line[i] = term.line[i+n];
557 term.line[i+n] = blank;
558 /* blank it */
559 memset(blank, 0, term.col * sizeof(Glyph));
560 }
561 }
562
563 void
564 tsetattr(int *attr, int l) {
565 int i;
566
567 for(i = 0; i < l; i++) {
568 switch(attr[i]) {
569 case 0:
570 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
571 term.c.attr.fg = DefaultFG;
572 term.c.attr.bg = DefaultBG;
573 break;
574 case 1:
575 term.c.attr.mode |= ATTR_BOLD;
576 break;
577 case 4:
578 term.c.attr.mode |= ATTR_UNDERLINE;
579 break;
580 case 7:
581 term.c.attr.mode |= ATTR_REVERSE;
582 break;
583 case 22:
584 term.c.attr.mode &= ~ATTR_BOLD;
585 break;
586 case 24:
587 term.c.attr.mode &= ~ATTR_UNDERLINE;
588 break;
589 case 27:
590 term.c.attr.mode &= ~ATTR_REVERSE;
591 break;
592 case 39:
593 term.c.attr.fg = DefaultFG;
594 break;
595 case 49:
596 term.c.attr.fg = DefaultBG;
597 break;
598 default:
599 if(BETWEEN(attr[i], 30, 37))
600 term.c.attr.fg = attr[i] - 30;
601 else if(BETWEEN(attr[i], 40, 47))
602 term.c.attr.bg = attr[i] - 40;
603 else
604 fprintf(stderr, "erresc: gfx attr %d unkown\n", attr[i]);
605 break;
606 }
607 }
608 }
609
610 void
611 tsetscroll(int t, int b) {
612 int temp;
613
614 LIMIT(t, 0, term.row-1);
615 LIMIT(b, 0, term.row-1);
616 if(t > b) {
617 temp = t;
618 t = b;
619 b = temp;
620 }
621 term.top = t;
622 term.bot = b;
623 }
624
625 void
626 csihandle(void) {
627 switch(escseq.mode) {
628 default:
629 unknown:
630 printf("erresc: unknown csi ");
631 csidump();
632 /* die(""); */
633 break;
634 case '@': /* ICH -- Insert <n> blank char */
635 DEFAULT(escseq.arg[0], 1);
636 tinsertblank(escseq.arg[0]);
637 break;
638 case 'A': /* CUU -- Cursor <n> Up */
639 case 'e':
640 DEFAULT(escseq.arg[0], 1);
641 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
642 break;
643 case 'B': /* CUD -- Cursor <n> Down */
644 DEFAULT(escseq.arg[0], 1);
645 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
646 break;
647 case 'C': /* CUF -- Cursor <n> Forward */
648 case 'a':
649 DEFAULT(escseq.arg[0], 1);
650 tmoveto(term.c.x+escseq.arg[0], term.c.y);
651 break;
652 case 'D': /* CUB -- Cursor <n> Backward */
653 DEFAULT(escseq.arg[0], 1);
654 tmoveto(term.c.x-escseq.arg[0], term.c.y);
655 break;
656 case 'E': /* CNL -- Cursor <n> Down and first col */
657 DEFAULT(escseq.arg[0], 1);
658 tmoveto(0, term.c.y+escseq.arg[0]);
659 break;
660 case 'F': /* CPL -- Cursor <n> Up and first col */
661 DEFAULT(escseq.arg[0], 1);
662 tmoveto(0, term.c.y-escseq.arg[0]);
663 break;
664 case 'G': /* CHA -- Move to <col> */
665 case '`': /* XXX: HPA -- same? */
666 DEFAULT(escseq.arg[0], 1);
667 tmoveto(escseq.arg[0]-1, term.c.y);
668 break;
669 case 'H': /* CUP -- Move to <row> <col> */
670 case 'f': /* XXX: HVP -- same? */
671 DEFAULT(escseq.arg[0], 1);
672 DEFAULT(escseq.arg[1], 1);
673 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
674 break;
675 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
676 case 'J': /* ED -- Clear screen */
677 switch(escseq.arg[0]) {
678 case 0: /* below */
679 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
680 break;
681 case 1: /* above */
682 tclearregion(0, 0, term.c.x, term.c.y);
683 break;
684 case 2: /* all */
685 tclearregion(0, 0, term.col-1, term.row-1);
686 break;
687 case 3: /* XXX: erase saved lines (xterm) */
688 default:
689 goto unknown;
690 }
691 break;
692 case 'K': /* EL -- Clear line */
693 switch(escseq.arg[0]) {
694 case 0: /* right */
695 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
696 break;
697 case 1: /* left */
698 tclearregion(0, term.c.y, term.c.x, term.c.y);
699 break;
700 case 2: /* all */
701 tclearregion(0, term.c.y, term.col-1, term.c.y);
702 break;
703 }
704 break;
705 case 'S': /* SU -- Scroll <n> line up */
706 DEFAULT(escseq.arg[0], 1);
707 tscrollup(escseq.arg[0]);
708 break;
709 case 'T': /* SD -- Scroll <n> line down */
710 DEFAULT(escseq.arg[0], 1);
711 tscrolldown(escseq.arg[0]);
712 break;
713 case 'L': /* IL -- Insert <n> blank lines */
714 DEFAULT(escseq.arg[0], 1);
715 tinsertblankline(escseq.arg[0]);
716 break;
717 case 'l': /* RM -- Reset Mode */
718 if(escseq.priv) {
719 switch(escseq.arg[0]) {
720 case 1:
721 term.mode &= ~MODE_APPKEYPAD;
722 break;
723 case 7:
724 term.mode &= ~MODE_WRAP;
725 break;
726 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
727 break;
728 case 25:
729 term.hidec = 1;
730 break;
731 case 1048: /* XXX: no alt. screen to erase/save */
732 case 1049:
733 tcursor(CURSOR_LOAD);
734 tclearregion(0, 0, term.col-1, term.row-1);
735 break;
736 default:
737 goto unknown;
738 }
739 } else {
740 switch(escseq.arg[0]) {
741 case 4:
742 term.mode &= ~MODE_INSERT;
743 break;
744 default:
745 goto unknown;
746 }
747 }
748 break;
749 case 'M': /* DL -- Delete <n> lines */
750 DEFAULT(escseq.arg[0], 1);
751 tdeleteline(escseq.arg[0]);
752 break;
753 case 'X': /* ECH -- Erase <n> char */
754 DEFAULT(escseq.arg[0], 1);
755 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
756 break;
757 case 'P': /* DCH -- Delete <n> char */
758 DEFAULT(escseq.arg[0], 1);
759 tdeletechar(escseq.arg[0]);
760 break;
761 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
762 case 'd': /* VPA -- Move to <row> */
763 DEFAULT(escseq.arg[0], 1);
764 tmoveto(term.c.x, escseq.arg[0]-1);
765 break;
766 case 'h': /* SM -- Set terminal mode */
767 if(escseq.priv) {
768 switch(escseq.arg[0]) {
769 case 1:
770 term.mode |= MODE_APPKEYPAD;
771 break;
772 case 7:
773 term.mode |= MODE_WRAP;
774 break;
775 case 12: /* att610 -- Start blinking cursor (IGNORED) */
776 break;
777 case 25:
778 term.hidec = 0;
779 break;
780 case 1048:
781 case 1049: /* XXX: no alt. screen to erase/save */
782 tcursor(CURSOR_SAVE);
783 tclearregion(0, 0, term.col-1, term.row-1);
784 break;
785 default: goto unknown;
786 }
787 } else {
788 switch(escseq.arg[0]) {
789 case 4:
790 term.mode |= MODE_INSERT;
791 break;
792 default: goto unknown;
793 }
794 };
795 break;
796 case 'm': /* SGR -- Terminal attribute (color) */
797 tsetattr(escseq.arg, escseq.narg);
798 break;
799 case 'r': /* DECSTBM -- Set Scrolling Region */
800 if(escseq.priv)
801 goto unknown;
802 else {
803 DEFAULT(escseq.arg[0], 1);
804 DEFAULT(escseq.arg[1], term.row);
805 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
806 }
807 break;
808 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
809 tcursor(CURSOR_SAVE);
810 break;
811 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
812 tcursor(CURSOR_LOAD);
813 break;
814 }
815 }
816
817 void
818 csidump(void) {
819 int i;
820 printf("ESC [ %s", escseq.priv ? "? " : "");
821 if(escseq.narg)
822 for(i = 0; i < escseq.narg; i++)
823 printf("%d ", escseq.arg[i]);
824 if(escseq.mode)
825 putchar(escseq.mode);
826 putchar('\n');
827 }
828
829 void
830 csireset(void) {
831 memset(&escseq, 0, sizeof(escseq));
832 }
833
834 void
835 tputtab(void) {
836 int space = TAB - term.c.x % TAB;
837
838 if(term.c.x + space >= term.col)
839 space--;
840
841 for(; space > 0; space--)
842 tmovecursor(CURSOR_RIGHT);
843 }
844
845 void
846 tputc(char c) {
847 /* dump(c); */
848 if(term.esc & ESC_START) {
849 if(term.esc & ESC_CSI) {
850 escseq.buf[escseq.len++] = c;
851 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
852 term.esc = 0;
853 csiparse(), csihandle();
854 }
855 } else if(term.esc & ESC_OSC) {
856 if(c == ';') {
857 term.titlelen = 0;
858 term.esc = ESC_START | ESC_TITLE;
859 }
860 } else if(term.esc & ESC_TITLE) {
861 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
862 term.esc = 0;
863 term.title[term.titlelen] = '\0';
864 XStoreName(xw.dis, xw.win, term.title);
865 } else {
866 term.title[term.titlelen++] = c;
867 }
868 } else if(term.esc & ESC_ALTCHARSET) {
869 switch(c) {
870 case '0': /* Line drawing crap */
871 term.c.attr.mode |= ATTR_GFX;
872 break;
873 case 'B': /* Back to regular text */
874 term.c.attr.mode &= ~ATTR_GFX;
875 break;
876 default:
877 printf("esc unhandled charset: ESC ( %c\n", c);
878 }
879 term.esc = 0;
880 } else {
881 switch(c) {
882 case '[':
883 term.esc |= ESC_CSI;
884 break;
885 case ']':
886 term.esc |= ESC_OSC;
887 break;
888 case '(':
889 term.esc |= ESC_ALTCHARSET;
890 break;
891 case 'A':
892 tmoveto(term.c.x, term.c.y-1);
893 term.esc = 0;
894 break;
895 case 'B':
896 tmoveto(term.c.x, term.c.y+1);
897 term.esc = 0;
898 break;
899 case 'C':
900 tmoveto(term.c.x+1, term.c.y);
901 term.esc = 0;
902 break;
903 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
904 tmoveto(term.c.x-1, term.c.y);
905 term.esc = 0;
906 break;
907 case 'E': /* NEL -- Next line */
908 tnewline();
909 term.esc = 0;
910 break;
911 case 'M': /* RI -- Reverse index */
912 if(term.c.y == term.top)
913 tscrolldown(1);
914 else
915 tmoveto(term.c.x, term.c.y-1);
916 term.esc = 0;
917 break;
918 case 'c': /* RIS -- Reset to inital state */
919 treset();
920 term.esc = 0;
921 break;
922 case '=': /* DECPAM */
923 term.mode |= MODE_APPKEYPAD;
924 term.esc = 0;
925 break;
926 case '>': /* DECPNM */
927 term.mode &= ~MODE_APPKEYPAD;
928 term.esc = 0;
929 break;
930 case '7':
931 tcursor(CURSOR_SAVE);
932 term.esc = 0;
933 break;
934 case '8':
935 tcursor(CURSOR_LOAD);
936 term.esc = 0;
937 break;
938 default:
939 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
940 term.esc = 0;
941 }
942 }
943 } else {
944 switch(c) {
945 case '\t':
946 tputtab();
947 break;
948 case '\b':
949 tmovecursor(CURSOR_LEFT);
950 break;
951 case '\r':
952 tmoveto(0, term.c.y);
953 break;
954 case '\n':
955 tnewline();
956 break;
957 case '\a':
958 xbell();
959 break;
960 case '\033':
961 csireset();
962 term.esc = ESC_START;
963 break;
964 default:
965 tsetchar(c);
966 tmovecursor(CURSOR_RIGHT);
967 break;
968 }
969 }
970 }
971
972 void
973 tputs(char *s, int len) {
974 for(; len > 0; len--)
975 tputc(*s++);
976 }
977
978 void
979 tresize(int col, int row) {
980 int i;
981 Line *line;
982 int minrow = MIN(row, term.row);
983 int mincol = MIN(col, term.col);
984
985 if(col < 1 || row < 1)
986 return;
987 /* alloc */
988 line = calloc(row, sizeof(Line));
989 for(i = 0 ; i < row; i++)
990 line[i] = calloc(col, sizeof(Glyph));
991 /* copy */
992 for(i = 0 ; i < minrow; i++)
993 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
994 /* free */
995 for(i = 0; i < term.row; i++)
996 free(term.line[i]);
997 free(term.line);
998
999 LIMIT(term.c.x, 0, col-1);
1000 LIMIT(term.c.y, 0, row-1);
1001 LIMIT(term.top, 0, row-1);
1002 LIMIT(term.bot, 0, row-1);
1003
1004 term.bot = row-1;
1005 term.line = line;
1006 term.col = col, term.row = row;
1007 }
1008
1009 unsigned long
1010 xgetcol(const char *s) {
1011 XColor color;
1012 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1013
1014 if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
1015 color.pixel = WhitePixel(xw.dis, xw.scr);
1016 fprintf(stderr, "Could not allocate color '%s'\n", s);
1017 }
1018 return color.pixel;
1019 }
1020
1021 void
1022 xclear(int x1, int y1, int x2, int y2) {
1023 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1024 XFillRectangle(xw.dis, xw.buf, dc.gc,
1025 x1 * xw.cw, y1 * xw.ch,
1026 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1027 }
1028
1029 void
1030 xinit(void) {
1031 XClassHint chint;
1032 XWMHints wmhint;
1033 XSizeHints shint;
1034 char *args[] = {NULL};
1035 int i;
1036
1037 xw.dis = XOpenDisplay(NULL);
1038 xw.scr = XDefaultScreen(xw.dis);
1039 if(!xw.dis)
1040 die("Can't open display\n");
1041
1042 /* font */
1043 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1044 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1045
1046 /* XXX: Assuming same size for bold font */
1047 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1048 xw.ch = dc.font->ascent + dc.font->descent;
1049
1050 /* colors */
1051 for(i = 0; i < LEN(colorname); i++)
1052 dc.col[i] = xgetcol(colorname[i]);
1053
1054 term.c.attr.fg = DefaultFG;
1055 term.c.attr.bg = DefaultBG;
1056 term.c.attr.mode = ATTR_NULL;
1057 /* windows */
1058 xw.h = term.row * xw.ch;
1059 xw.w = term.col * xw.cw;
1060 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1061 xw.w + 2*BORDER, xw.h + 2*BORDER, 0,
1062 dc.col[DefaultBG],
1063 dc.col[DefaultBG]);
1064 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.w, xw.h, XDefaultDepth(xw.dis, xw.scr));
1065 /* gc */
1066 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1067 XMapWindow(xw.dis, xw.win);
1068 /* wm stuff */
1069 chint.res_name = TNAME, chint.res_class = TNAME;
1070 wmhint.input = 1, wmhint.flags = InputHint;
1071 shint.height_inc = xw.ch, shint.width_inc = xw.cw;
1072 shint.height = xw.h + 2*BORDER, shint.width = xw.w + 2*BORDER;
1073 shint.flags = PSize | PResizeInc;
1074 XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
1075 XStoreName(xw.dis, xw.win, TNAME);
1076 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1077 XSync(xw.dis, 0);
1078
1079 }
1080
1081 void
1082 xdraws(char *s, Glyph base, int x, int y, int len) {
1083 unsigned long xfg, xbg;
1084 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1085 int i;
1086
1087 if(base.mode & ATTR_REVERSE)
1088 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1089 else
1090 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1091
1092 XSetBackground(xw.dis, dc.gc, xbg);
1093 XSetForeground(xw.dis, dc.gc, xfg);
1094
1095 if(base.mode & ATTR_GFX)
1096 for(i = 0; i < len; i++)
1097 s[i] = gfx[s[i]];
1098
1099 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1100 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1101
1102 if(base.mode & ATTR_UNDERLINE)
1103 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1104 }
1105
1106 void
1107 xcursor(int mode) {
1108 static int oldx = 0;
1109 static int oldy = 0;
1110 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1111
1112 LIMIT(oldx, 0, term.col-1);
1113 LIMIT(oldy, 0, term.row-1);
1114
1115 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1116 g.c = term.line[term.c.y][term.c.x].c;
1117
1118 /* remove the old cursor */
1119 if(term.line[oldy][oldx].state & GLYPH_SET)
1120 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1121 else
1122 xclear(oldx, oldy, oldx, oldy);
1123
1124 /* draw the new one */
1125 if(mode == CURSOR_DRAW) {
1126 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1127 oldx = term.c.x, oldy = term.c.y;
1128 }
1129 }
1130
1131
1132 #ifdef DEBUG
1133 /* basic drawing routines */
1134 void
1135 xdrawc(int x, int y, Glyph g) {
1136 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1137 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1138 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1139 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1140 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1141 }
1142
1143 void
1144 draw_(int dummy) {
1145 int x, y;
1146
1147 xclear(0, 0, term.col-1, term.row-1);
1148 for(y = 0; y < term.row; y++)
1149 for(x = 0; x < term.col; x++)
1150 if(term.line[y][x].state & GLYPH_SET)
1151 xdrawc(x, y, term.line[y][x]);
1152
1153 if(!term.hidec)
1154 xcursor(CURSOR_DRAW);
1155 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.w, xw.h, BORDER, BORDER);
1156 XFlush(xw.dis);
1157 }
1158 #endif
1159
1160 void
1161 draw(int redraw_all) {
1162 int i, x, y, ox;
1163 Glyph base, new;
1164 char buf[DRAW_BUF_SIZ];
1165
1166 for(y = 0; y < term.row; y++) {
1167 base = term.line[y][0];
1168 i = ox = 0;
1169 for(x = 0; x < term.col; x++) {
1170 new = term.line[y][x];
1171 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1172 buf[i++] = new.c;
1173 else {
1174 xdraws(buf, base, ox, y, i);
1175 buf[0] = new.c;
1176 i = 1;
1177 ox = x;
1178 base = new;
1179 }
1180 }
1181 xdraws(buf, base, ox, y, i);
1182 }
1183 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1184 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.w, xw.h, BORDER, BORDER);
1185 XFlush(xw.dis);
1186 }
1187
1188 void
1189 expose(XEvent *ev) {
1190 draw(SCREEN_REDRAW);
1191 }
1192
1193 char*
1194 kmap(KeySym k) {
1195 int i;
1196 for(i = 0; i < LEN(key); i++)
1197 if(key[i].k == k)
1198 return (char*)key[i].s;
1199 return NULL;
1200 }
1201
1202 void
1203 kpress(XEvent *ev) {
1204 XKeyEvent *e = &ev->xkey;
1205 KeySym ksym;
1206 char buf[32];
1207 char *customkey;
1208 int len;
1209 int meta;
1210 int shift;
1211
1212 meta = e->state & Mod1Mask;
1213 shift = e->state & ShiftMask;
1214 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1215
1216 if(customkey = kmap(ksym))
1217 ttywrite(customkey, strlen(customkey));
1218 else if(len > 0) {
1219 buf[sizeof(buf)-1] = '\0';
1220 if(meta && len == 1)
1221 ttywrite("\033", 1);
1222 ttywrite(buf, len);
1223 } else
1224 switch(ksym) {
1225 case XK_Up:
1226 case XK_Down:
1227 case XK_Left:
1228 case XK_Right:
1229 sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1230 ttywrite(buf, 3);
1231 break;
1232 case XK_Insert:
1233 if(shift)
1234 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1235 break;
1236 default:
1237 fprintf(stderr, "errkey: %d\n", (int)ksym);
1238 break;
1239 }
1240 }
1241
1242 void
1243 resize(XEvent *e) {
1244 int col, row;
1245 col = e->xconfigure.width / xw.cw;
1246 row = e->xconfigure.height / xw.ch;
1247
1248 if(term.col != col || term.row != row) {
1249 tresize(col, row);
1250 ttyresize(col, row);
1251 xw.w = e->xconfigure.width;
1252 xw.h = e->xconfigure.height;
1253 XFreePixmap(xw.dis, xw.buf);
1254 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.w, xw.h, XDefaultDepth(xw.dis, xw.scr));
1255 draw(SCREEN_REDRAW);
1256 }
1257 }
1258
1259 void
1260 run(void) {
1261 XEvent ev;
1262 fd_set rfd;
1263 int xfd = XConnectionNumber(xw.dis);
1264
1265 running = 1;
1266 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1267 XResizeWindow(xw.dis, xw.win, xw.w+2*BORDER, xw.h+2*BORDER); /* fix resize bug in wmii (?) */
1268
1269 while(running) {
1270 FD_ZERO(&rfd);
1271 FD_SET(cmdfd, &rfd);
1272 FD_SET(xfd, &rfd);
1273 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1274 if(errno == EINTR)
1275 continue;
1276 die("select failed: %s\n", SERRNO);
1277 }
1278 if(FD_ISSET(cmdfd, &rfd)) {
1279 ttyread();
1280 draw(SCREEN_UPDATE);
1281 }
1282 while(XPending(xw.dis)) {
1283 XNextEvent(xw.dis, &ev);
1284 if(handler[ev.type])
1285 (handler[ev.type])(&ev);
1286 }
1287 }
1288 }
1289
1290 int
1291 main(int argc, char *argv[]) {
1292 if(argc == 2 && !strncmp("-v", argv[1], 3))
1293 die("st-" VERSION ", © 2009 st engineers\n");
1294 else if(argc != 1)
1295 die("usage: st [-v]\n");
1296 setlocale(LC_CTYPE, "");
1297 tnew(80, 24);
1298 ttynew();
1299 xinit();
1300 run();
1301 return 0;
1302 }