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fixed potential bug in IS_SET().
[st.git] / st.c
1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <locale.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/ioctl.h>
14 #include <sys/select.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <X11/Xlib.h>
20 #include <X11/keysym.h>
21 #include <X11/Xutil.h>
22
23 /* Arbitrary sizes */
24 #define ESC_TITLE_SIZ 256
25 #define ESC_BUF_SIZ 256
26 #define ESC_ARG_SIZ 16
27 #define DRAW_BUF_SIZ 1024
28
29 #define SERRNO strerror(errno)
30 #define MIN(a, b) ((a) < (b) ? (a) : (b))
31 #define MAX(a, b) ((a) < (b) ? (b) : (a))
32 #define LEN(a) (sizeof(a) / sizeof(a[0]))
33 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
34 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
35 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
36 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
37 #define IS_SET(flag) (term.mode & (flag))
38
39 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
40 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
41 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
42 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 bufw; /* pixmap width */
99 int bufh; /* pixmap height */
100 int ch; /* char height */
101 int cw; /* char width */
102 } XWindow;
103
104 typedef struct {
105 KeySym k;
106 char s[ESC_BUF_SIZ];
107 } Key;
108
109 /* Drawing Context */
110 typedef struct {
111 unsigned long col[256];
112 XFontStruct* font;
113 XFontStruct* bfont;
114 GC gc;
115 } DC;
116
117 #include "config.h"
118
119 static void die(const char *errstr, ...);
120 static void draw(int);
121 static void execsh(void);
122 static void sigchld(int);
123 static void run(void);
124
125 static void csidump(void);
126 static void csihandle(void);
127 static void csiparse(void);
128 static void csireset(void);
129
130 static void tclearregion(int, int, int, int);
131 static void tcursor(int);
132 static void tdeletechar(int);
133 static void tdeleteline(int);
134 static void tinsertblank(int);
135 static void tinsertblankline(int);
136 static void tmoveto(int, int);
137 static void tnew(int, int);
138 static void tnewline(void);
139 static void tputtab(void);
140 static void tputc(char);
141 static void tputs(char*, int);
142 static void treset(void);
143 static void tresize(int, int);
144 static void tscroll(void);
145 static void tscrollup(int);
146 static void tscrolldown(int);
147 static void tsetattr(int*, int);
148 static void tsetchar(char);
149 static void tsetscroll(int, int);
150
151 static void ttynew(void);
152 static void ttyread(void);
153 static void ttyresize(int, int);
154 static void ttywrite(const char *, size_t);
155
156 static void xbell(void);
157 static void xdraws(char *, Glyph, int, int, int);
158 static void xhints(void);
159 static void xclear(int, int, int, int);
160 static void xcursor(int);
161 static void xinit(void);
162 static void xloadcols(void);
163
164 static void expose(XEvent *);
165 static char* kmap(KeySym);
166 static void kpress(XEvent *);
167 static void resize(XEvent *);
168
169 static void (*handler[LASTEvent])(XEvent *) = {
170 [KeyPress] = kpress,
171 [Expose] = expose,
172 [ConfigureNotify] = resize
173 };
174
175 /* Globals */
176 static DC dc;
177 static XWindow xw;
178 static Term term;
179 static CSIEscape escseq;
180 static int cmdfd;
181 static pid_t pid;
182 static int running;
183
184 #ifdef DEBUG
185 void
186 tdump(void) {
187 int row, col;
188 Glyph c;
189
190 for(row = 0; row < term.row; row++) {
191 for(col = 0; col < term.col; col++) {
192 if(col == term.c.x && row == term.c.y)
193 putchar('#');
194 else {
195 c = term.line[row][col];
196 putchar(c.state & GLYPH_SET ? c.c : '.');
197 }
198 }
199 putchar('\n');
200 }
201 }
202 #endif
203
204 void
205 die(const char *errstr, ...) {
206 va_list ap;
207
208 va_start(ap, errstr);
209 vfprintf(stderr, errstr, ap);
210 va_end(ap);
211 exit(EXIT_FAILURE);
212 }
213
214 void
215 execsh(void) {
216 char *args[3] = {getenv("SHELL"), "-i", NULL};
217 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
218 putenv("TERM=" TNAME);
219 execvp(args[0], args);
220 }
221
222 void
223 xbell(void) { /* visual bell */
224 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
225 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
226 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
227 /* usleep(30000); */
228 draw(SCREEN_REDRAW);
229 }
230
231 void
232 sigchld(int a) {
233 int stat = 0;
234 if(waitpid(pid, &stat, 0) < 0)
235 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
236 if(WIFEXITED(stat))
237 exit(WEXITSTATUS(stat));
238 else
239 exit(EXIT_FAILURE);
240 }
241
242 void
243 ttynew(void) {
244 int m, s;
245 char *pts;
246
247 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
248 die("openpt failed: %s\n", SERRNO);
249 if(grantpt(m) < 0)
250 die("grantpt failed: %s\n", SERRNO);
251 if(unlockpt(m) < 0)
252 die("unlockpt failed: %s\n", SERRNO);
253 if(!(pts = ptsname(m)))
254 die("ptsname failed: %s\n", SERRNO);
255 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
256 die("Couldn't open slave: %s\n", SERRNO);
257 fcntl(s, F_SETFL, O_NDELAY);
258 switch(pid = fork()) {
259 case -1:
260 die("fork failed\n");
261 break;
262 case 0:
263 setsid(); /* create a new process group */
264 dup2(s, STDIN_FILENO);
265 dup2(s, STDOUT_FILENO);
266 dup2(s, STDERR_FILENO);
267 if(ioctl(s, TIOCSCTTY, NULL) < 0)
268 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
269 close(s);
270 close(m);
271 execsh();
272 break;
273 default:
274 close(s);
275 cmdfd = m;
276 signal(SIGCHLD, sigchld);
277 }
278 }
279
280 void
281 dump(char c) {
282 static int col;
283 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
284 if(++col % 10 == 0)
285 fprintf(stderr, "\n");
286 }
287
288 void
289 ttyread(void) {
290 char buf[BUFSIZ] = {0};
291 int ret;
292
293 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
294 die("Couldn't read from shell: %s\n", SERRNO);
295 else
296 tputs(buf, ret);
297 }
298
299 void
300 ttywrite(const char *s, size_t n) {
301 if(write(cmdfd, s, n) == -1)
302 die("write error on tty: %s\n", SERRNO);
303 }
304
305 void
306 ttyresize(int x, int y) {
307 struct winsize w;
308
309 w.ws_row = term.row;
310 w.ws_col = term.col;
311 w.ws_xpixel = w.ws_ypixel = 0;
312 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
313 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
314 }
315
316 void
317 tcursor(int mode) {
318 static TCursor c;
319
320 if(mode == CURSOR_SAVE)
321 c = term.c;
322 else if(mode == CURSOR_LOAD)
323 term.c = c, tmoveto(c.x, c.y);
324 }
325
326 void
327 treset(void) {
328 term.c.attr.mode = ATTR_NULL;
329 term.c.attr.fg = DefaultFG;
330 term.c.attr.bg = DefaultBG;
331 term.c.x = term.c.y = 0;
332 term.hidec = 0;
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 /* screen size */
341 term.row = row, term.col = col;
342 term.top = 0, term.bot = term.row - 1;
343 /* mode */
344 term.mode = MODE_WRAP;
345 /* cursor */
346 term.c.attr.mode = ATTR_NULL;
347 term.c.attr.fg = DefaultFG;
348 term.c.attr.bg = DefaultBG;
349 term.c.x = term.c.y = 0;
350 term.hidec = 0;
351 /* allocate screen */
352 term.line = calloc(term.row, sizeof(Line));
353 for(row = 0 ; row < term.row; row++)
354 term.line[row] = calloc(term.col, sizeof(Glyph));
355 }
356
357 /* TODO: Replace with scrollup/scolldown */
358 void
359 tscroll(void) {
360 Line temp = term.line[term.top];
361 int i;
362
363 for(i = term.top; i < term.bot; i++)
364 term.line[i] = term.line[i+1];
365 memset(temp, 0, sizeof(Glyph) * term.col);
366 term.line[term.bot] = temp;
367 }
368
369 void
370 tscrolldown (int n) {
371 int i;
372 Line temp;
373
374 LIMIT(n, 0, term.bot-term.top+1);
375
376 for(i = 0; i < n; i++)
377 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
378
379 for(i = term.bot; i >= term.top+n; i--) {
380 temp = term.line[i];
381 term.line[i] = term.line[i-n];
382 term.line[i-n] = temp;
383 }
384 }
385
386 void
387 tscrollup (int n) {
388 int i;
389 Line temp;
390 LIMIT(n, 0, term.bot-term.top+1);
391
392 for(i = 0; i < n; i++)
393 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
394
395 for(i = term.top; i <= term.bot-n; i++) {
396 temp = term.line[i];
397 term.line[i] = term.line[i+n];
398 term.line[i+n] = temp;
399 }
400 }
401
402 void
403 tnewline(void) {
404 int y = term.c.y + 1;
405 if(y > term.bot)
406 tscroll(), y = term.bot;
407 tmoveto(0, y);
408 }
409
410 void
411 csiparse(void) {
412 /* int noarg = 1; */
413 char *p = escseq.buf;
414
415 escseq.narg = 0;
416 if(*p == '?')
417 escseq.priv = 1, p++;
418
419 while(p < escseq.buf+escseq.len) {
420 while(isdigit(*p)) {
421 escseq.arg[escseq.narg] *= 10;
422 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
423 }
424 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
425 escseq.narg++, p++;
426 else {
427 escseq.mode = *p;
428 escseq.narg++;
429 return;
430 }
431 }
432 }
433
434 void
435 tmoveto(int x, int y) {
436 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
437 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
438 }
439
440 void
441 tsetchar(char c) {
442 term.line[term.c.y][term.c.x] = term.c.attr;
443 term.line[term.c.y][term.c.x].c = c;
444 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
445 }
446
447 void
448 tclearregion(int x1, int y1, int x2, int y2) {
449 int y, temp;
450
451 if(x1 > x2)
452 temp = x1, x1 = x2, x2 = temp;
453 if(y1 > y2)
454 temp = y1, y1 = y2, y2 = temp;
455
456 LIMIT(x1, 0, term.col-1);
457 LIMIT(x2, 0, term.col-1);
458 LIMIT(y1, 0, term.row-1);
459 LIMIT(y2, 0, term.row-1);
460
461 for(y = y1; y <= y2; y++)
462 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
463 }
464
465 void
466 tdeletechar(int n) {
467 int src = term.c.x + n;
468 int dst = term.c.x;
469 int size = term.col - src;
470
471 if(src >= term.col) {
472 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
473 return;
474 }
475 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
476 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
477 }
478
479 void
480 tinsertblank(int n) {
481 int src = term.c.x;
482 int dst = src + n;
483 int size = term.col - dst;
484
485 if(dst >= term.col) {
486 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
487 return;
488 }
489 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
490 tclearregion(src, term.c.y, dst - 1, term.c.y);
491 }
492
493 void
494 tinsertblankline(int n) {
495 int i;
496 Line blank;
497 int bot = term.bot;
498
499 if(term.c.y > term.bot)
500 bot = term.row - 1;
501 else if(term.c.y < term.top)
502 bot = term.top - 1;
503 if(term.c.y + n >= bot) {
504 tclearregion(0, term.c.y, term.col-1, bot);
505 return;
506 }
507 for(i = bot; i >= term.c.y+n; i--) {
508 /* swap deleted line <-> blanked line */
509 blank = term.line[i];
510 term.line[i] = term.line[i-n];
511 term.line[i-n] = blank;
512 /* blank it */
513 memset(blank, 0, term.col * sizeof(Glyph));
514 }
515 }
516
517 void
518 tdeleteline(int n) {
519 int i;
520 Line blank;
521 int bot = term.bot;
522
523 if(term.c.y > term.bot)
524 bot = term.row - 1;
525 else if(term.c.y < term.top)
526 bot = term.top - 1;
527 if(term.c.y + n >= bot) {
528 tclearregion(0, term.c.y, term.col-1, bot);
529 return;
530 }
531 for(i = term.c.y; i <= bot-n; i++) {
532 /* swap deleted line <-> blanked line */
533 blank = term.line[i];
534 term.line[i] = term.line[i+n];
535 term.line[i+n] = blank;
536 /* blank it */
537 memset(blank, 0, term.col * sizeof(Glyph));
538 }
539 }
540
541 void
542 tsetattr(int *attr, int l) {
543 int i;
544
545 for(i = 0; i < l; i++) {
546 switch(attr[i]) {
547 case 0:
548 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
549 term.c.attr.fg = DefaultFG;
550 term.c.attr.bg = DefaultBG;
551 break;
552 case 1:
553 term.c.attr.mode |= ATTR_BOLD;
554 break;
555 case 4:
556 term.c.attr.mode |= ATTR_UNDERLINE;
557 break;
558 case 7:
559 term.c.attr.mode |= ATTR_REVERSE;
560 break;
561 case 22:
562 term.c.attr.mode &= ~ATTR_BOLD;
563 break;
564 case 24:
565 term.c.attr.mode &= ~ATTR_UNDERLINE;
566 break;
567 case 27:
568 term.c.attr.mode &= ~ATTR_REVERSE;
569 break;
570 case 38:
571 if (i + 2 < l && attr[i + 1] == 5) {
572 i += 2;
573 if (BETWEEN(attr[i], 0, 255))
574 term.c.attr.fg = attr[i];
575 else
576 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
577 }
578 else
579 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
580 break;
581 case 39:
582 term.c.attr.fg = DefaultFG;
583 break;
584 case 48:
585 if (i + 2 < l && attr[i + 1] == 5) {
586 i += 2;
587 if (BETWEEN(attr[i], 0, 255))
588 term.c.attr.bg = attr[i];
589 else
590 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
591 }
592 else
593 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
594 break;
595 case 49:
596 term.c.attr.bg = 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 if(BETWEEN(attr[i], 90, 97))
604 term.c.attr.fg = attr[i] - 90 + 8;
605 else if(BETWEEN(attr[i], 100, 107))
606 term.c.attr.fg = attr[i] - 100 + 8;
607 else
608 fprintf(stderr, "erresc: gfx attr %d unknown\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 tmoveto(term.c.x + space, term.c.y);
842 }
843
844 void
845 tputc(char c) {
846 if(term.esc & ESC_START) {
847 if(term.esc & ESC_CSI) {
848 escseq.buf[escseq.len++] = c;
849 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
850 term.esc = 0;
851 csiparse(), csihandle();
852 }
853 } else if(term.esc & ESC_OSC) {
854 if(c == ';') {
855 term.titlelen = 0;
856 term.esc = ESC_START | ESC_TITLE;
857 }
858 } else if(term.esc & ESC_TITLE) {
859 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
860 term.esc = 0;
861 term.title[term.titlelen] = '\0';
862 XStoreName(xw.dis, xw.win, term.title);
863 } else {
864 term.title[term.titlelen++] = c;
865 }
866 } else if(term.esc & ESC_ALTCHARSET) {
867 switch(c) {
868 case '0': /* Line drawing crap */
869 term.c.attr.mode |= ATTR_GFX;
870 break;
871 case 'B': /* Back to regular text */
872 term.c.attr.mode &= ~ATTR_GFX;
873 break;
874 default:
875 printf("esc unhandled charset: ESC ( %c\n", c);
876 }
877 term.esc = 0;
878 } else {
879 switch(c) {
880 case '[':
881 term.esc |= ESC_CSI;
882 break;
883 case ']':
884 term.esc |= ESC_OSC;
885 break;
886 case '(':
887 term.esc |= ESC_ALTCHARSET;
888 break;
889 case 'A':
890 tmoveto(term.c.x, term.c.y-1);
891 term.esc = 0;
892 break;
893 case 'B':
894 tmoveto(term.c.x, term.c.y+1);
895 term.esc = 0;
896 break;
897 case 'C':
898 tmoveto(term.c.x+1, term.c.y);
899 term.esc = 0;
900 break;
901 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
902 tmoveto(term.c.x-1, term.c.y);
903 term.esc = 0;
904 break;
905 case 'E': /* NEL -- Next line */
906 tnewline();
907 term.esc = 0;
908 break;
909 case 'M': /* RI -- Reverse index */
910 if(term.c.y == term.top)
911 tscrolldown(1);
912 else
913 tmoveto(term.c.x, term.c.y-1);
914 term.esc = 0;
915 break;
916 case 'c': /* RIS -- Reset to inital state */
917 treset();
918 term.esc = 0;
919 break;
920 case '=': /* DECPAM */
921 term.mode |= MODE_APPKEYPAD;
922 term.esc = 0;
923 break;
924 case '>': /* DECPNM */
925 term.mode &= ~MODE_APPKEYPAD;
926 term.esc = 0;
927 break;
928 case '7':
929 tcursor(CURSOR_SAVE);
930 term.esc = 0;
931 break;
932 case '8':
933 tcursor(CURSOR_LOAD);
934 term.esc = 0;
935 break;
936 default:
937 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
938 term.esc = 0;
939 }
940 }
941 } else {
942 switch(c) {
943 case '\t':
944 tputtab();
945 break;
946 case '\b':
947 tmoveto(term.c.x-1, term.c.y);
948 break;
949 case '\r':
950 tmoveto(0, term.c.y);
951 break;
952 case '\n':
953 tnewline();
954 break;
955 case '\a':
956 xbell();
957 break;
958 case '\033':
959 csireset();
960 term.esc = ESC_START;
961 break;
962 default:
963 tsetchar(c);
964 if(term.c.x+1 < term.col) {
965 tmoveto(term.c.x+1, term.c.y);
966 } else if(IS_SET(MODE_WRAP))
967 tnewline();
968 break;
969 }
970 }
971 }
972
973 void
974 tputs(char *s, int len) {
975 for(; len > 0; len--)
976 tputc(*s++);
977 }
978
979 void
980 tresize(int col, int row) {
981 int i;
982 int minrow = MIN(row, term.row);
983 int mincol = MIN(col, term.col);
984
985 if(col < 1 || row < 1)
986 return;
987
988 /* free uneeded rows */
989 for(i = row; i < term.row; i++)
990 free(term.line[i]);
991
992 /* resize to new height */
993 term.line = realloc(term.line, row * sizeof(Line));
994
995 /* resize each row to new width, zero-pad if needed */
996 for(i = 0; i < minrow; i++) {
997 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
998 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
999 }
1000
1001 /* allocate any new rows */
1002 for(/* i == minrow */; i < row; i++)
1003 term.line[i] = calloc(col, sizeof(Glyph));
1004
1005 LIMIT(term.c.x, 0, col-1);
1006 LIMIT(term.c.y, 0, row-1);
1007 LIMIT(term.top, 0, row-1);
1008 LIMIT(term.bot, 0, row-1);
1009
1010 term.bot = row-1;
1011 term.col = col, term.row = row;
1012 }
1013
1014 void
1015 xloadcols(void) {
1016 int i, r, g, b;
1017 XColor color;
1018 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1019 unsigned long white = WhitePixel(xw.dis, xw.scr);
1020
1021 for(i = 0; i < 16; i++) {
1022 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1023 dc.col[i] = white;
1024 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1025 } else
1026 dc.col[i] = color.pixel;
1027 }
1028
1029 /* same colors as xterm */
1030 for(r = 0; r < 6; r++)
1031 for(g = 0; g < 6; g++)
1032 for(b = 0; b < 6; b++) {
1033 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1034 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1035 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1036 if (!XAllocColor(xw.dis, cmap, &color)) {
1037 dc.col[i] = white;
1038 fprintf(stderr, "Could not allocate color %d\n", i);
1039 } else
1040 dc.col[i] = color.pixel;
1041 i++;
1042 }
1043
1044 for(r = 0; r < 24; r++, i++) {
1045 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1046 if (!XAllocColor(xw.dis, cmap, &color)) {
1047 dc.col[i] = white;
1048 fprintf(stderr, "Could not allocate color %d\n", i);
1049 } else
1050 dc.col[i] = color.pixel;
1051 }
1052 }
1053
1054 void
1055 xclear(int x1, int y1, int x2, int y2) {
1056 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1057 XFillRectangle(xw.dis, xw.buf, dc.gc,
1058 x1 * xw.cw, y1 * xw.ch,
1059 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1060 }
1061
1062 void
1063 xhints(void)
1064 {
1065 XClassHint class = {TNAME, TNAME};
1066 XWMHints wm = {.flags = InputHint, .input = 1};
1067 XSizeHints size = {
1068 .flags = PSize | PResizeInc | PBaseSize,
1069 .height = xw.h,
1070 .width = xw.w,
1071 .height_inc = xw.ch,
1072 .width_inc = xw.cw,
1073 .base_height = 2*BORDER,
1074 .base_width = 2*BORDER,
1075 };
1076 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1077 }
1078
1079 void
1080 xinit(void) {
1081 xw.dis = XOpenDisplay(NULL);
1082 xw.scr = XDefaultScreen(xw.dis);
1083 if(!xw.dis)
1084 die("Can't open display\n");
1085
1086 /* font */
1087 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1088 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1089
1090 /* XXX: Assuming same size for bold font */
1091 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1092 xw.ch = dc.font->ascent + dc.font->descent;
1093
1094 /* colors */
1095 xloadcols();
1096
1097 term.c.attr.fg = DefaultFG;
1098 term.c.attr.bg = DefaultBG;
1099 term.c.attr.mode = ATTR_NULL;
1100 /* windows */
1101 xw.h = term.row * xw.ch + 2*BORDER;
1102 xw.w = term.col * xw.cw + 2*BORDER;
1103 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1104 xw.w, xw.h, 0,
1105 dc.col[DefaultBG],
1106 dc.col[DefaultBG]);
1107 xw.bufw = xw.w - 2*BORDER;
1108 xw.bufh = xw.h - 2*BORDER;
1109 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1110 /* gc */
1111 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1112 XMapWindow(xw.dis, xw.win);
1113 xhints();
1114 XStoreName(xw.dis, xw.win, "st");
1115 XSync(xw.dis, 0);
1116 }
1117
1118 void
1119 xdraws(char *s, Glyph base, int x, int y, int len) {
1120 unsigned long xfg, xbg;
1121 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1122 int i;
1123
1124 if(base.mode & ATTR_REVERSE)
1125 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1126 else
1127 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1128
1129 XSetBackground(xw.dis, dc.gc, xbg);
1130 XSetForeground(xw.dis, dc.gc, xfg);
1131
1132 if(base.mode & ATTR_GFX)
1133 for(i = 0; i < len; i++)
1134 s[i] = gfx[(int)s[i]];
1135
1136 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1137 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1138
1139 if(base.mode & ATTR_UNDERLINE)
1140 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1141 }
1142
1143 void
1144 xcursor(int mode) {
1145 static int oldx = 0;
1146 static int oldy = 0;
1147 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1148
1149 LIMIT(oldx, 0, term.col-1);
1150 LIMIT(oldy, 0, term.row-1);
1151
1152 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1153 g.c = term.line[term.c.y][term.c.x].c;
1154
1155 /* remove the old cursor */
1156 if(term.line[oldy][oldx].state & GLYPH_SET)
1157 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1158 else
1159 xclear(oldx, oldy, oldx, oldy);
1160
1161 /* draw the new one */
1162 if(mode == CURSOR_DRAW) {
1163 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1164 oldx = term.c.x, oldy = term.c.y;
1165 }
1166 }
1167
1168 #ifdef DEBUG
1169 /* basic drawing routines */
1170 void
1171 xdrawc(int x, int y, Glyph g) {
1172 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1173 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1174 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1175 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1176 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1177 }
1178
1179 void
1180 draw(int dummy) {
1181 int x, y;
1182
1183 xclear(0, 0, term.col-1, term.row-1);
1184 for(y = 0; y < term.row; y++)
1185 for(x = 0; x < term.col; x++)
1186 if(term.line[y][x].state & GLYPH_SET)
1187 xdrawc(x, y, term.line[y][x]);
1188
1189 if(!term.hidec)
1190 xcursor(CURSOR_DRAW);
1191 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1192 XFlush(xw.dis);
1193 }
1194
1195 #else
1196 /* optimized drawing routine */
1197 void
1198 draw(int redraw_all) {
1199 int i, x, y, ox;
1200 Glyph base, new;
1201 char buf[DRAW_BUF_SIZ];
1202
1203 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1204 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1205 for(y = 0; y < term.row; y++) {
1206 base = term.line[y][0];
1207 i = ox = 0;
1208 for(x = 0; x < term.col; x++) {
1209 new = term.line[y][x];
1210 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1211 buf[i++] = new.c;
1212 else {
1213 xdraws(buf, base, ox, y, i);
1214 buf[0] = new.c;
1215 i = 1;
1216 ox = x;
1217 base = new;
1218 }
1219 }
1220 xdraws(buf, base, ox, y, i);
1221 }
1222 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1223 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1224 XFlush(xw.dis);
1225 }
1226
1227 #endif
1228
1229 void
1230 expose(XEvent *ev) {
1231 draw(SCREEN_REDRAW);
1232 }
1233
1234 char*
1235 kmap(KeySym k) {
1236 int i;
1237 for(i = 0; i < LEN(key); i++)
1238 if(key[i].k == k)
1239 return (char*)key[i].s;
1240 return NULL;
1241 }
1242
1243 void
1244 kpress(XEvent *ev) {
1245 XKeyEvent *e = &ev->xkey;
1246 KeySym ksym;
1247 char buf[32];
1248 char *customkey;
1249 int len;
1250 int meta;
1251 int shift;
1252
1253 meta = e->state & Mod1Mask;
1254 shift = e->state & ShiftMask;
1255 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1256
1257 if((customkey = kmap(ksym)))
1258 ttywrite(customkey, strlen(customkey));
1259 else if(len > 0) {
1260 buf[sizeof(buf)-1] = '\0';
1261 if(meta && len == 1)
1262 ttywrite("\033", 1);
1263 ttywrite(buf, len);
1264 } else
1265 switch(ksym) {
1266 case XK_Up:
1267 case XK_Down:
1268 case XK_Left:
1269 case XK_Right:
1270 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1271 ttywrite(buf, 3);
1272 break;
1273 case XK_Insert:
1274 if(shift)
1275 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1276 break;
1277 default:
1278 fprintf(stderr, "errkey: %d\n", (int)ksym);
1279 break;
1280 }
1281 }
1282
1283 void
1284 resize(XEvent *e) {
1285 int col, row;
1286
1287 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1288 return;
1289
1290 xw.w = e->xconfigure.width;
1291 xw.h = e->xconfigure.height;
1292 xw.bufw = xw.w - 2*BORDER;
1293 xw.bufh = xw.h - 2*BORDER;
1294 col = xw.bufw / xw.cw;
1295 row = xw.bufh / xw.ch;
1296 tresize(col, row);
1297 ttyresize(col, row);
1298 XFreePixmap(xw.dis, xw.buf);
1299 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1300 draw(SCREEN_REDRAW);
1301 }
1302
1303 void
1304 run(void) {
1305 XEvent ev;
1306 fd_set rfd;
1307 int xfd = XConnectionNumber(xw.dis);
1308
1309 running = 1;
1310 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1311 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1312
1313 while(running) {
1314 FD_ZERO(&rfd);
1315 FD_SET(cmdfd, &rfd);
1316 FD_SET(xfd, &rfd);
1317 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1318 if(errno == EINTR)
1319 continue;
1320 die("select failed: %s\n", SERRNO);
1321 }
1322 if(FD_ISSET(cmdfd, &rfd)) {
1323 ttyread();
1324 draw(SCREEN_UPDATE);
1325 }
1326 while(XPending(xw.dis)) {
1327 XNextEvent(xw.dis, &ev);
1328 if(handler[ev.type])
1329 (handler[ev.type])(&ev);
1330 }
1331 }
1332 }
1333
1334 int
1335 main(int argc, char *argv[]) {
1336 if(argc == 2 && !strncmp("-v", argv[1], 3))
1337 die("st-" VERSION ", (c) 2010 st engineers\n");
1338 else if(argc != 1)
1339 die("usage: st [-v]\n");
1340 setlocale(LC_CTYPE, "");
1341 tnew(80, 24);
1342 ttynew();
1343 xinit();
1344 run();
1345 return 0;
1346 }