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[st.git] / st.c
1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <locale.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/ioctl.h>
14 #include <sys/select.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <X11/Xlib.h>
20 #include <X11/keysym.h>
21 #include <X11/Xutil.h>
22
23 #if defined(__linux)
24 #include <pty.h>
25 #elif defined(__OpenBSD__) || defined(__NetBSD__)
26 #include <util.h>
27 #elif defined(__FreeBSD__) || defined(__DragonFly__)
28 #include <libutil.h>
29 #endif
30
31 /* Arbitrary sizes */
32 #define ESC_TITLE_SIZ 256
33 #define ESC_BUF_SIZ 256
34 #define ESC_ARG_SIZ 16
35 #define DRAW_BUF_SIZ 1024
36
37 #define SERRNO strerror(errno)
38 #define MIN(a, b) ((a) < (b) ? (a) : (b))
39 #define MAX(a, b) ((a) < (b) ? (b) : (a))
40 #define LEN(a) (sizeof(a) / sizeof(a[0]))
41 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
42 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
43 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
44 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
45 #define IS_SET(flag) (term.mode & (flag))
46
47 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
48 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
49 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
50 CURSOR_SAVE, CURSOR_LOAD };
51 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
52 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
53 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8 };
54 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
55 enum { SCREEN_UPDATE, SCREEN_REDRAW };
56
57 typedef struct {
58 char c; /* character code */
59 char mode; /* attribute flags */
60 int fg; /* foreground */
61 int bg; /* background */
62 char state; /* state flags */
63 } Glyph;
64
65 typedef Glyph* Line;
66
67 typedef struct {
68 Glyph attr; /* current char attributes */
69 int x;
70 int y;
71 char state;
72 } TCursor;
73
74 /* CSI Escape sequence structs */
75 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
76 typedef struct {
77 char buf[ESC_BUF_SIZ]; /* raw string */
78 int len; /* raw string length */
79 char priv;
80 int arg[ESC_ARG_SIZ];
81 int narg; /* nb of args */
82 char mode;
83 } CSIEscape;
84
85 /* Internal representation of the screen */
86 typedef struct {
87 int row; /* nb row */
88 int col; /* nb col */
89 Line* line; /* screen */
90 Line* alt; /* alternate screen */
91 TCursor c; /* cursor */
92 int top; /* top scroll limit */
93 int bot; /* bottom scroll limit */
94 int mode; /* terminal mode flags */
95 int esc; /* escape state flags */
96 char title[ESC_TITLE_SIZ];
97 int titlelen;
98 } Term;
99
100 /* Purely graphic info */
101 typedef struct {
102 Display* dis;
103 Window win;
104 Pixmap buf;
105 int scr;
106 int w; /* window width */
107 int h; /* window height */
108 int bufw; /* pixmap width */
109 int bufh; /* pixmap height */
110 int ch; /* char height */
111 int cw; /* char width */
112 int hasfocus;
113 } XWindow;
114
115 typedef struct {
116 KeySym k;
117 char s[ESC_BUF_SIZ];
118 } Key;
119
120 /* Drawing Context */
121 typedef struct {
122 unsigned long col[256];
123 XFontStruct* font;
124 XFontStruct* bfont;
125 GC gc;
126 } DC;
127
128 typedef struct {
129 int mode;
130 int bx, by;
131 int ex, ey;
132 int b[2], e[2];
133 char *clip;
134 } Selection;
135
136 #include "config.h"
137
138 static void die(const char *errstr, ...);
139 static void draw(int);
140 static void execsh(void);
141 static void sigchld(int);
142 static void run(void);
143
144 static void csidump(void);
145 static void csihandle(void);
146 static void csiparse(void);
147 static void csireset(void);
148
149 static void tclearregion(int, int, int, int);
150 static void tcursor(int);
151 static void tdeletechar(int);
152 static void tdeleteline(int);
153 static void tinsertblank(int);
154 static void tinsertblankline(int);
155 static void tmoveto(int, int);
156 static void tnew(int, int);
157 static void tnewline(void);
158 static void tputtab(void);
159 static void tputc(char);
160 static void tputs(char*, int);
161 static void treset(void);
162 static void tresize(int, int);
163 static void tscrollup(int);
164 static void tscrolldown(int);
165 static void tsetattr(int*, int);
166 static void tsetchar(char);
167 static void tsetscroll(int, int);
168 static void tswapscreen(void);
169
170 static void ttynew(void);
171 static void ttyread(void);
172 static void ttyresize(int, int);
173 static void ttywrite(const char *, size_t);
174
175 static void xdraws(char *, Glyph, int, int, int);
176 static void xhints(void);
177 static void xclear(int, int, int, int);
178 static void xdrawcursor(void);
179 static void xinit(void);
180 static void xloadcols(void);
181 static void xseturgency(int);
182
183 static void expose(XEvent *);
184 static char* kmap(KeySym);
185 static void kpress(XEvent *);
186 static void resize(XEvent *);
187 static void focus(XEvent *);
188 static void brelease(XEvent *);
189 static void bpress(XEvent *);
190 static void bmotion(XEvent *);
191
192
193 static void (*handler[LASTEvent])(XEvent *) = {
194 [KeyPress] = kpress,
195 [Expose] = expose,
196 [ConfigureNotify] = resize,
197 [FocusIn] = focus,
198 [FocusOut] = focus,
199 [MotionNotify] = bmotion,
200 [ButtonPress] = bpress,
201 [ButtonRelease] = brelease,
202 };
203
204 /* Globals */
205 static DC dc;
206 static XWindow xw;
207 static Term term;
208 static CSIEscape escseq;
209 static int cmdfd;
210 static pid_t pid;
211 static Selection sel;
212
213 void
214 selinit(void) {
215 sel.mode = 0;
216 sel.bx = -1;
217 sel.clip = NULL;
218 }
219
220 static inline int selected(int x, int y) {
221 if(sel.ey == y && sel.by == y) {
222 int bx = MIN(sel.bx, sel.ex);
223 int ex = MAX(sel.bx, sel.ex);
224 return BETWEEN(x, bx, ex);
225 }
226 return ((sel.b[1] < y&&y < sel.e[1]) || (y==sel.e[1] && x<=sel.e[0]))
227 || (y==sel.b[1] && x>=sel.b[0] && (x<=sel.e[0] || sel.b[1]!=sel.e[1]));
228 }
229
230 static void getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
231 if(b) *b = e->xbutton.state,
232 *b=*b==4096?5:*b==2048?4:*b==1024?3:*b==512?2:*b==256?1:-1;
233 *x = e->xbutton.x/xw.cw;
234 *y = e->xbutton.y/xw.ch;
235 sel.b[0] = sel.by < sel.ey ? sel.bx : sel.ex;
236 sel.b[1] = MIN(sel.by, sel.ey);
237 sel.e[0] = sel.by < sel.ey ? sel.ex : sel.bx;
238 sel.e[1] = MAX(sel.by, sel.ey);
239 }
240
241 static void bpress(XEvent *e) {
242 sel.mode = 1;
243 sel.ex = sel.bx = e->xbutton.x/xw.cw;
244 sel.ey = sel.by = e->xbutton.y/xw.ch;
245 }
246
247 static char *getseltext() {
248 char *str, *ptr;
249 int ls, x, y, sz;
250 if(sel.bx == -1)
251 return NULL;
252 sz = (term.col+1) * (sel.e[1]-sel.b[1]+1);
253 ptr = str = malloc(sz);
254 for(y = 0; y < term.row; y++) {
255 for(x = 0; x < term.col; x++)
256 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y)))
257 *ptr = term.line[y][x].c, ptr++;
258 if(ls)
259 *ptr = '\n', ptr++;
260 }
261 *ptr = 0;
262 return str;
263 }
264
265 /* TODO: use X11 clipboard */
266 static void selcopy(char *str) {
267 free(sel.clip);
268 sel.clip = str;
269 }
270
271 static void selpaste() {
272 if(sel.clip)
273 ttywrite(sel.clip, strlen(sel.clip));
274 }
275
276 /* TODO: doubleclick to select word */
277 static void brelease(XEvent *e) {
278 int b;
279 sel.mode = 0;
280 getbuttoninfo(e, &b, &sel.ex, &sel.ey);
281 if(sel.bx==sel.ex && sel.by==sel.ey) {
282 sel.bx = -1;
283 if(b==2)
284 selpaste();
285 } else {
286 if(b==1)
287 selcopy(getseltext());
288 }
289 draw(1);
290 }
291
292 static void bmotion(XEvent *e) {
293 if (sel.mode) {
294 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
295 draw(1);
296 }
297 }
298
299 #ifdef DEBUG
300 void
301 tdump(void) {
302 int row, col;
303 Glyph c;
304
305 for(row = 0; row < term.row; row++) {
306 for(col = 0; col < term.col; col++) {
307 if(col == term.c.x && row == term.c.y)
308 putchar('#');
309 else {
310 c = term.line[row][col];
311 putchar(c.state & GLYPH_SET ? c.c : '.');
312 }
313 }
314 putchar('\n');
315 }
316 }
317 #endif
318
319 void
320 die(const char *errstr, ...) {
321 va_list ap;
322
323 va_start(ap, errstr);
324 vfprintf(stderr, errstr, ap);
325 va_end(ap);
326 exit(EXIT_FAILURE);
327 }
328
329 void
330 execsh(void) {
331 char *args[3] = {getenv("SHELL"), "-i", NULL};
332 DEFAULT(args[0], SHELL); /* if getenv() failed */
333 putenv("TERM=" TNAME);
334 execvp(args[0], args);
335 }
336
337 void
338 sigchld(int a) {
339 int stat = 0;
340 if(waitpid(pid, &stat, 0) < 0)
341 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
342 if(WIFEXITED(stat))
343 exit(WEXITSTATUS(stat));
344 else
345 exit(EXIT_FAILURE);
346 }
347
348 void
349 ttynew(void) {
350 int m, s;
351
352 /* seems to work fine on linux, openbsd and freebsd */
353 struct winsize w = {term.row, term.col, 0, 0};
354 if(openpty(&m, &s, NULL, NULL, &w) < 0)
355 die("openpty failed: %s\n", SERRNO);
356
357 switch(pid = fork()) {
358 case -1:
359 die("fork failed\n");
360 break;
361 case 0:
362 setsid(); /* create a new process group */
363 dup2(s, STDIN_FILENO);
364 dup2(s, STDOUT_FILENO);
365 dup2(s, STDERR_FILENO);
366 if(ioctl(s, TIOCSCTTY, NULL) < 0)
367 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
368 close(s);
369 close(m);
370 execsh();
371 break;
372 default:
373 close(s);
374 cmdfd = m;
375 signal(SIGCHLD, sigchld);
376 }
377 }
378
379 void
380 dump(char c) {
381 static int col;
382 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
383 if(++col % 10 == 0)
384 fprintf(stderr, "\n");
385 }
386
387 void
388 ttyread(void) {
389 char buf[BUFSIZ] = {0};
390 int ret;
391
392 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
393 die("Couldn't read from shell: %s\n", SERRNO);
394 else
395 tputs(buf, ret);
396 }
397
398 void
399 ttywrite(const char *s, size_t n) {
400 if(write(cmdfd, s, n) == -1)
401 die("write error on tty: %s\n", SERRNO);
402 }
403
404 void
405 ttyresize(int x, int y) {
406 struct winsize w;
407
408 w.ws_row = term.row;
409 w.ws_col = term.col;
410 w.ws_xpixel = w.ws_ypixel = 0;
411 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
412 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
413 }
414
415 void
416 tcursor(int mode) {
417 static TCursor c;
418
419 if(mode == CURSOR_SAVE)
420 c = term.c;
421 else if(mode == CURSOR_LOAD)
422 term.c = c, tmoveto(c.x, c.y);
423 }
424
425 void
426 treset(void) {
427 term.c = (TCursor){{
428 .mode = ATTR_NULL,
429 .fg = DefaultFG,
430 .bg = DefaultBG
431 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
432
433 term.top = 0, term.bot = term.row - 1;
434 term.mode = MODE_WRAP;
435 tclearregion(0, 0, term.col-1, term.row-1);
436 }
437
438 void
439 tnew(int col, int row) {
440 /* set screen size */
441 term.row = row, term.col = col;
442 term.line = malloc(term.row * sizeof(Line));
443 term.alt = malloc(term.row * sizeof(Line));
444 for(row = 0 ; row < term.row; row++) {
445 term.line[row] = malloc(term.col * sizeof(Glyph));
446 term.alt [row] = malloc(term.col * sizeof(Glyph));
447 }
448 /* setup screen */
449 treset();
450 }
451
452 void
453 tswapscreen(void) {
454 Line* tmp = term.line;
455 term.line = term.alt;
456 term.alt = tmp;
457 term.mode ^= MODE_ALTSCREEN;
458 }
459
460 void
461 tscrolldown (int n) {
462 int i;
463 Line temp;
464
465 LIMIT(n, 0, term.bot-term.top+1);
466
467 for(i = 0; i < n; i++)
468 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
469
470 for(i = term.bot; i >= term.top+n; i--) {
471 temp = term.line[i];
472 term.line[i] = term.line[i-n];
473 term.line[i-n] = temp;
474 }
475 }
476
477 void
478 tscrollup (int n) {
479 int i;
480 Line temp;
481 LIMIT(n, 0, term.bot-term.top+1);
482
483 for(i = 0; i < n; i++)
484 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
485
486 for(i = term.top; i <= term.bot-n; i++) {
487 temp = term.line[i];
488 term.line[i] = term.line[i+n];
489 term.line[i+n] = temp;
490 }
491 }
492
493 void
494 tnewline(void) {
495 int y = term.c.y + 1;
496 if(y > term.bot)
497 tscrollup(1), y = term.bot;
498 tmoveto(0, y);
499 }
500
501 void
502 csiparse(void) {
503 /* int noarg = 1; */
504 char *p = escseq.buf;
505
506 escseq.narg = 0;
507 if(*p == '?')
508 escseq.priv = 1, p++;
509
510 while(p < escseq.buf+escseq.len) {
511 while(isdigit(*p)) {
512 escseq.arg[escseq.narg] *= 10;
513 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
514 }
515 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
516 escseq.narg++, p++;
517 else {
518 escseq.mode = *p;
519 escseq.narg++;
520 return;
521 }
522 }
523 }
524
525 void
526 tmoveto(int x, int y) {
527 LIMIT(x, 0, term.col-1);
528 LIMIT(y, 0, term.row-1);
529 term.c.state &= ~CURSOR_WRAPNEXT;
530 term.c.x = x;
531 term.c.y = y;
532 }
533
534 void
535 tsetchar(char c) {
536 term.line[term.c.y][term.c.x] = term.c.attr;
537 term.line[term.c.y][term.c.x].c = c;
538 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
539 }
540
541 void
542 tclearregion(int x1, int y1, int x2, int y2) {
543 int y, temp;
544
545 if(x1 > x2)
546 temp = x1, x1 = x2, x2 = temp;
547 if(y1 > y2)
548 temp = y1, y1 = y2, y2 = temp;
549
550 LIMIT(x1, 0, term.col-1);
551 LIMIT(x2, 0, term.col-1);
552 LIMIT(y1, 0, term.row-1);
553 LIMIT(y2, 0, term.row-1);
554
555 for(y = y1; y <= y2; y++)
556 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
557 }
558
559 void
560 tdeletechar(int n) {
561 int src = term.c.x + n;
562 int dst = term.c.x;
563 int size = term.col - src;
564
565 if(src >= term.col) {
566 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
567 return;
568 }
569 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
570 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
571 }
572
573 void
574 tinsertblank(int n) {
575 int src = term.c.x;
576 int dst = src + n;
577 int size = term.col - dst;
578
579 if(dst >= term.col) {
580 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
581 return;
582 }
583 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
584 tclearregion(src, term.c.y, dst - 1, term.c.y);
585 }
586
587 void
588 tinsertblankline(int n) {
589 int i;
590 Line blank;
591 int bot = term.bot;
592
593 if(term.c.y > term.bot)
594 bot = term.row - 1;
595 else if(term.c.y < term.top)
596 bot = term.top - 1;
597 if(term.c.y + n >= bot) {
598 tclearregion(0, term.c.y, term.col-1, bot);
599 return;
600 }
601 for(i = bot; i >= term.c.y+n; i--) {
602 /* swap deleted line <-> blanked line */
603 blank = term.line[i];
604 term.line[i] = term.line[i-n];
605 term.line[i-n] = blank;
606 /* blank it */
607 memset(blank, 0, term.col * sizeof(Glyph));
608 }
609 }
610
611 void
612 tdeleteline(int n) {
613 int i;
614 Line blank;
615 int bot = term.bot;
616
617 if(term.c.y > term.bot)
618 bot = term.row - 1;
619 else if(term.c.y < term.top)
620 bot = term.top - 1;
621 if(term.c.y + n >= bot) {
622 tclearregion(0, term.c.y, term.col-1, bot);
623 return;
624 }
625 for(i = term.c.y; i <= bot-n; i++) {
626 /* swap deleted line <-> blanked line */
627 blank = term.line[i];
628 term.line[i] = term.line[i+n];
629 term.line[i+n] = blank;
630 /* blank it */
631 memset(blank, 0, term.col * sizeof(Glyph));
632 }
633 }
634
635 void
636 tsetattr(int *attr, int l) {
637 int i;
638
639 for(i = 0; i < l; i++) {
640 switch(attr[i]) {
641 case 0:
642 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
643 term.c.attr.fg = DefaultFG;
644 term.c.attr.bg = DefaultBG;
645 break;
646 case 1:
647 term.c.attr.mode |= ATTR_BOLD;
648 break;
649 case 4:
650 term.c.attr.mode |= ATTR_UNDERLINE;
651 break;
652 case 7:
653 term.c.attr.mode |= ATTR_REVERSE;
654 break;
655 case 22:
656 term.c.attr.mode &= ~ATTR_BOLD;
657 break;
658 case 24:
659 term.c.attr.mode &= ~ATTR_UNDERLINE;
660 break;
661 case 27:
662 term.c.attr.mode &= ~ATTR_REVERSE;
663 break;
664 case 38:
665 if (i + 2 < l && attr[i + 1] == 5) {
666 i += 2;
667 if (BETWEEN(attr[i], 0, 255))
668 term.c.attr.fg = attr[i];
669 else
670 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
671 }
672 else
673 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
674 break;
675 case 39:
676 term.c.attr.fg = DefaultFG;
677 break;
678 case 48:
679 if (i + 2 < l && attr[i + 1] == 5) {
680 i += 2;
681 if (BETWEEN(attr[i], 0, 255))
682 term.c.attr.bg = attr[i];
683 else
684 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
685 }
686 else
687 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
688 break;
689 case 49:
690 term.c.attr.bg = DefaultBG;
691 break;
692 default:
693 if(BETWEEN(attr[i], 30, 37))
694 term.c.attr.fg = attr[i] - 30;
695 else if(BETWEEN(attr[i], 40, 47))
696 term.c.attr.bg = attr[i] - 40;
697 else if(BETWEEN(attr[i], 90, 97))
698 term.c.attr.fg = attr[i] - 90 + 8;
699 else if(BETWEEN(attr[i], 100, 107))
700 term.c.attr.fg = attr[i] - 100 + 8;
701 else
702 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
703 break;
704 }
705 }
706 }
707
708 void
709 tsetscroll(int t, int b) {
710 int temp;
711
712 LIMIT(t, 0, term.row-1);
713 LIMIT(b, 0, term.row-1);
714 if(t > b) {
715 temp = t;
716 t = b;
717 b = temp;
718 }
719 term.top = t;
720 term.bot = b;
721 }
722
723 void
724 csihandle(void) {
725 switch(escseq.mode) {
726 default:
727 unknown:
728 printf("erresc: unknown csi ");
729 csidump();
730 /* die(""); */
731 break;
732 case '@': /* ICH -- Insert <n> blank char */
733 DEFAULT(escseq.arg[0], 1);
734 tinsertblank(escseq.arg[0]);
735 break;
736 case 'A': /* CUU -- Cursor <n> Up */
737 case 'e':
738 DEFAULT(escseq.arg[0], 1);
739 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
740 break;
741 case 'B': /* CUD -- Cursor <n> Down */
742 DEFAULT(escseq.arg[0], 1);
743 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
744 break;
745 case 'C': /* CUF -- Cursor <n> Forward */
746 case 'a':
747 DEFAULT(escseq.arg[0], 1);
748 tmoveto(term.c.x+escseq.arg[0], term.c.y);
749 break;
750 case 'D': /* CUB -- Cursor <n> Backward */
751 DEFAULT(escseq.arg[0], 1);
752 tmoveto(term.c.x-escseq.arg[0], term.c.y);
753 break;
754 case 'E': /* CNL -- Cursor <n> Down and first col */
755 DEFAULT(escseq.arg[0], 1);
756 tmoveto(0, term.c.y+escseq.arg[0]);
757 break;
758 case 'F': /* CPL -- Cursor <n> Up and first col */
759 DEFAULT(escseq.arg[0], 1);
760 tmoveto(0, term.c.y-escseq.arg[0]);
761 break;
762 case 'G': /* CHA -- Move to <col> */
763 case '`': /* XXX: HPA -- same? */
764 DEFAULT(escseq.arg[0], 1);
765 tmoveto(escseq.arg[0]-1, term.c.y);
766 break;
767 case 'H': /* CUP -- Move to <row> <col> */
768 case 'f': /* XXX: HVP -- same? */
769 DEFAULT(escseq.arg[0], 1);
770 DEFAULT(escseq.arg[1], 1);
771 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
772 break;
773 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
774 case 'J': /* ED -- Clear screen */
775 switch(escseq.arg[0]) {
776 case 0: /* below */
777 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
778 break;
779 case 1: /* above */
780 tclearregion(0, 0, term.c.x, term.c.y);
781 break;
782 case 2: /* all */
783 tclearregion(0, 0, term.col-1, term.row-1);
784 break;
785 default:
786 goto unknown;
787 }
788 break;
789 case 'K': /* EL -- Clear line */
790 switch(escseq.arg[0]) {
791 case 0: /* right */
792 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
793 break;
794 case 1: /* left */
795 tclearregion(0, term.c.y, term.c.x, term.c.y);
796 break;
797 case 2: /* all */
798 tclearregion(0, term.c.y, term.col-1, term.c.y);
799 break;
800 }
801 break;
802 case 'S': /* SU -- Scroll <n> line up */
803 DEFAULT(escseq.arg[0], 1);
804 tscrollup(escseq.arg[0]);
805 break;
806 case 'T': /* SD -- Scroll <n> line down */
807 DEFAULT(escseq.arg[0], 1);
808 tscrolldown(escseq.arg[0]);
809 break;
810 case 'L': /* IL -- Insert <n> blank lines */
811 DEFAULT(escseq.arg[0], 1);
812 tinsertblankline(escseq.arg[0]);
813 break;
814 case 'l': /* RM -- Reset Mode */
815 if(escseq.priv) {
816 switch(escseq.arg[0]) {
817 case 1:
818 term.mode &= ~MODE_APPKEYPAD;
819 break;
820 case 7:
821 term.mode &= ~MODE_WRAP;
822 break;
823 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
824 break;
825 case 25:
826 term.c.state |= CURSOR_HIDE;
827 break;
828 case 1049: /* = 1047 and 1048 */
829 case 1047:
830 if(IS_SET(MODE_ALTSCREEN)) {
831 tclearregion(0, 0, term.col-1, term.row-1);
832 tswapscreen();
833 }
834 if(escseq.arg[0] == 1047)
835 break;
836 case 1048:
837 tcursor(CURSOR_LOAD);
838 break;
839 default:
840 goto unknown;
841 }
842 } else {
843 switch(escseq.arg[0]) {
844 case 4:
845 term.mode &= ~MODE_INSERT;
846 break;
847 default:
848 goto unknown;
849 }
850 }
851 break;
852 case 'M': /* DL -- Delete <n> lines */
853 DEFAULT(escseq.arg[0], 1);
854 tdeleteline(escseq.arg[0]);
855 break;
856 case 'X': /* ECH -- Erase <n> char */
857 DEFAULT(escseq.arg[0], 1);
858 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
859 break;
860 case 'P': /* DCH -- Delete <n> char */
861 DEFAULT(escseq.arg[0], 1);
862 tdeletechar(escseq.arg[0]);
863 break;
864 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
865 case 'd': /* VPA -- Move to <row> */
866 DEFAULT(escseq.arg[0], 1);
867 tmoveto(term.c.x, escseq.arg[0]-1);
868 break;
869 case 'h': /* SM -- Set terminal mode */
870 if(escseq.priv) {
871 switch(escseq.arg[0]) {
872 case 1:
873 term.mode |= MODE_APPKEYPAD;
874 break;
875 case 7:
876 term.mode |= MODE_WRAP;
877 break;
878 case 12: /* att610 -- Start blinking cursor (IGNORED) */
879 break;
880 case 25:
881 term.c.state &= ~CURSOR_HIDE;
882 break;
883 case 1049: /* = 1047 and 1048 */
884 case 1047:
885 if(IS_SET(MODE_ALTSCREEN))
886 tclearregion(0, 0, term.col-1, term.row-1);
887 else
888 tswapscreen();
889 if(escseq.arg[0] == 1047)
890 break;
891 case 1048:
892 tcursor(CURSOR_SAVE);
893 break;
894 default: goto unknown;
895 }
896 } else {
897 switch(escseq.arg[0]) {
898 case 4:
899 term.mode |= MODE_INSERT;
900 break;
901 default: goto unknown;
902 }
903 };
904 break;
905 case 'm': /* SGR -- Terminal attribute (color) */
906 tsetattr(escseq.arg, escseq.narg);
907 break;
908 case 'r': /* DECSTBM -- Set Scrolling Region */
909 if(escseq.priv)
910 goto unknown;
911 else {
912 DEFAULT(escseq.arg[0], 1);
913 DEFAULT(escseq.arg[1], term.row);
914 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
915 tmoveto(0, 0);
916 }
917 break;
918 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
919 tcursor(CURSOR_SAVE);
920 break;
921 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
922 tcursor(CURSOR_LOAD);
923 break;
924 }
925 }
926
927 void
928 csidump(void) {
929 int i;
930 printf("ESC [ %s", escseq.priv ? "? " : "");
931 if(escseq.narg)
932 for(i = 0; i < escseq.narg; i++)
933 printf("%d ", escseq.arg[i]);
934 if(escseq.mode)
935 putchar(escseq.mode);
936 putchar('\n');
937 }
938
939 void
940 csireset(void) {
941 memset(&escseq, 0, sizeof(escseq));
942 }
943
944 void
945 tputtab(void) {
946 int space = TAB - term.c.x % TAB;
947 tmoveto(term.c.x + space, term.c.y);
948 }
949
950 void
951 tputc(char c) {
952 if(term.esc & ESC_START) {
953 if(term.esc & ESC_CSI) {
954 escseq.buf[escseq.len++] = c;
955 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
956 term.esc = 0;
957 csiparse(), csihandle();
958 }
959 } else if(term.esc & ESC_OSC) {
960 if(c == ';') {
961 term.titlelen = 0;
962 term.esc = ESC_START | ESC_TITLE;
963 }
964 } else if(term.esc & ESC_TITLE) {
965 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
966 term.esc = 0;
967 term.title[term.titlelen] = '\0';
968 XStoreName(xw.dis, xw.win, term.title);
969 } else {
970 term.title[term.titlelen++] = c;
971 }
972 } else if(term.esc & ESC_ALTCHARSET) {
973 switch(c) {
974 case '0': /* Line drawing crap */
975 term.c.attr.mode |= ATTR_GFX;
976 break;
977 case 'B': /* Back to regular text */
978 term.c.attr.mode &= ~ATTR_GFX;
979 break;
980 default:
981 printf("esc unhandled charset: ESC ( %c\n", c);
982 }
983 term.esc = 0;
984 } else {
985 switch(c) {
986 case '[':
987 term.esc |= ESC_CSI;
988 break;
989 case ']':
990 term.esc |= ESC_OSC;
991 break;
992 case '(':
993 term.esc |= ESC_ALTCHARSET;
994 break;
995 case 'D': /* IND -- Linefeed */
996 if(term.c.y == term.bot)
997 tscrollup(1);
998 else
999 tmoveto(term.c.x, term.c.y+1);
1000 term.esc = 0;
1001 break;
1002 case 'E': /* NEL -- Next line */
1003 tnewline();
1004 term.esc = 0;
1005 break;
1006 case 'M': /* RI -- Reverse index */
1007 if(term.c.y == term.top)
1008 tscrolldown(1);
1009 else
1010 tmoveto(term.c.x, term.c.y-1);
1011 term.esc = 0;
1012 break;
1013 case 'c': /* RIS -- Reset to inital state */
1014 treset();
1015 term.esc = 0;
1016 break;
1017 case '=': /* DECPAM -- Application keypad */
1018 term.mode |= MODE_APPKEYPAD;
1019 term.esc = 0;
1020 break;
1021 case '>': /* DECPNM -- Normal keypad */
1022 term.mode &= ~MODE_APPKEYPAD;
1023 term.esc = 0;
1024 break;
1025 case '7': /* DECSC -- Save Cursor */
1026 tcursor(CURSOR_SAVE);
1027 term.esc = 0;
1028 break;
1029 case '8': /* DECRC -- Restore Cursor */
1030 tcursor(CURSOR_LOAD);
1031 term.esc = 0;
1032 break;
1033 default:
1034 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
1035 term.esc = 0;
1036 }
1037 }
1038 } else {
1039 switch(c) {
1040 case '\t':
1041 tputtab();
1042 break;
1043 case '\b':
1044 tmoveto(term.c.x-1, term.c.y);
1045 break;
1046 case '\r':
1047 tmoveto(0, term.c.y);
1048 break;
1049 case '\n':
1050 tnewline();
1051 break;
1052 case '\a':
1053 if(!xw.hasfocus)
1054 xseturgency(1);
1055 break;
1056 case '\033':
1057 csireset();
1058 term.esc = ESC_START;
1059 break;
1060 default:
1061 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1062 tnewline();
1063 tsetchar(c);
1064 if(term.c.x+1 < term.col)
1065 tmoveto(term.c.x+1, term.c.y);
1066 else
1067 term.c.state |= CURSOR_WRAPNEXT;
1068 break;
1069 }
1070 }
1071 }
1072
1073 void
1074 tputs(char *s, int len) {
1075 for(; len > 0; len--)
1076 tputc(*s++);
1077 }
1078
1079 void
1080 tresize(int col, int row) {
1081 int i;
1082 int minrow = MIN(row, term.row);
1083 int mincol = MIN(col, term.col);
1084
1085 if(col < 1 || row < 1)
1086 return;
1087
1088 /* free uneeded rows */
1089 for(i = row; i < term.row; i++) {
1090 free(term.line[i]);
1091 free(term.alt[i]);
1092 }
1093
1094 /* resize to new height */
1095 term.line = realloc(term.line, row * sizeof(Line));
1096 term.alt = realloc(term.alt, row * sizeof(Line));
1097
1098 /* resize each row to new width, zero-pad if needed */
1099 for(i = 0; i < minrow; i++) {
1100 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1101 term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
1102 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1103 memset(term.alt[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1104 }
1105
1106 /* allocate any new rows */
1107 for(/* i == minrow */; i < row; i++) {
1108 term.line[i] = calloc(col, sizeof(Glyph));
1109 term.alt [i] = calloc(col, sizeof(Glyph));
1110 }
1111
1112 /* update terminal size */
1113 term.col = col, term.row = row;
1114 /* make use of the LIMIT in tmoveto */
1115 tmoveto(term.c.x, term.c.y);
1116 /* reset scrolling region */
1117 tsetscroll(0, row-1);
1118 }
1119
1120 void
1121 xloadcols(void) {
1122 int i, r, g, b;
1123 XColor color;
1124 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1125 unsigned long white = WhitePixel(xw.dis, xw.scr);
1126
1127 for(i = 0; i < 16; i++) {
1128 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1129 dc.col[i] = white;
1130 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1131 } else
1132 dc.col[i] = color.pixel;
1133 }
1134
1135 /* same colors as xterm */
1136 for(r = 0; r < 6; r++)
1137 for(g = 0; g < 6; g++)
1138 for(b = 0; b < 6; b++) {
1139 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1140 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1141 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1142 if (!XAllocColor(xw.dis, cmap, &color)) {
1143 dc.col[i] = white;
1144 fprintf(stderr, "Could not allocate color %d\n", i);
1145 } else
1146 dc.col[i] = color.pixel;
1147 i++;
1148 }
1149
1150 for(r = 0; r < 24; r++, i++) {
1151 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1152 if (!XAllocColor(xw.dis, cmap, &color)) {
1153 dc.col[i] = white;
1154 fprintf(stderr, "Could not allocate color %d\n", i);
1155 } else
1156 dc.col[i] = color.pixel;
1157 }
1158 }
1159
1160 void
1161 xclear(int x1, int y1, int x2, int y2) {
1162 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1163 XFillRectangle(xw.dis, xw.buf, dc.gc,
1164 x1 * xw.cw, y1 * xw.ch,
1165 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1166 }
1167
1168 void
1169 xhints(void)
1170 {
1171 XClassHint class = {TNAME, TNAME};
1172 XWMHints wm = {.flags = InputHint, .input = 1};
1173 XSizeHints size = {
1174 .flags = PSize | PResizeInc | PBaseSize,
1175 .height = xw.h,
1176 .width = xw.w,
1177 .height_inc = xw.ch,
1178 .width_inc = xw.cw,
1179 .base_height = 2*BORDER,
1180 .base_width = 2*BORDER,
1181 };
1182 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1183 }
1184
1185 void
1186 xinit(void) {
1187 if(!(xw.dis = XOpenDisplay(NULL)))
1188 die("Can't open display\n");
1189 xw.scr = XDefaultScreen(xw.dis);
1190
1191 /* font */
1192 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1193 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1194
1195 /* XXX: Assuming same size for bold font */
1196 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1197 xw.ch = dc.font->ascent + dc.font->descent;
1198
1199 /* colors */
1200 xloadcols();
1201
1202 /* windows */
1203 xw.h = term.row * xw.ch + 2*BORDER;
1204 xw.w = term.col * xw.cw + 2*BORDER;
1205 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1206 xw.w, xw.h, 0,
1207 dc.col[DefaultBG],
1208 dc.col[DefaultBG]);
1209 xw.bufw = xw.w - 2*BORDER;
1210 xw.bufh = xw.h - 2*BORDER;
1211 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1212 /* gc */
1213 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1214
1215 /* event mask */
1216 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask
1217 | StructureNotifyMask | FocusChangeMask | PointerMotionMask
1218 | ButtonPressMask | ButtonReleaseMask);
1219
1220 XMapWindow(xw.dis, xw.win);
1221 xhints();
1222 XStoreName(xw.dis, xw.win, "st");
1223 XSync(xw.dis, 0);
1224 }
1225
1226 void
1227 xdraws(char *s, Glyph base, int x, int y, int len) {
1228 unsigned long xfg, xbg;
1229 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1230 int i;
1231
1232 if(base.mode & ATTR_REVERSE)
1233 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1234 else
1235 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1236
1237 XSetBackground(xw.dis, dc.gc, xbg);
1238 XSetForeground(xw.dis, dc.gc, xfg);
1239
1240 if(base.mode & ATTR_GFX)
1241 for(i = 0; i < len; i++)
1242 s[i] = gfx[(int)s[i]];
1243
1244 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1245 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1246
1247 if(base.mode & ATTR_UNDERLINE)
1248 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1249 }
1250
1251 void
1252 xdrawcursor(void) {
1253 static int oldx = 0;
1254 static int oldy = 0;
1255 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1256
1257 LIMIT(oldx, 0, term.col-1);
1258 LIMIT(oldy, 0, term.row-1);
1259
1260 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1261 g.c = term.line[term.c.y][term.c.x].c;
1262
1263 /* remove the old cursor */
1264 if(term.line[oldy][oldx].state & GLYPH_SET)
1265 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1266 else
1267 xclear(oldx, oldy, oldx, oldy);
1268
1269 /* draw the new one */
1270 if(!(term.c.state & CURSOR_HIDE) && xw.hasfocus) {
1271 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1272 oldx = term.c.x, oldy = term.c.y;
1273 }
1274 }
1275
1276 #ifdef DEBUG
1277 /* basic drawing routines */
1278 void
1279 xdrawc(int x, int y, Glyph g) {
1280 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1281 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1282 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1283 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1284 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1285 }
1286
1287 void
1288 draw(int dummy) {
1289 int x, y;
1290
1291 xclear(0, 0, term.col-1, term.row-1);
1292 for(y = 0; y < term.row; y++)
1293 for(x = 0; x < term.col; x++)
1294 if(term.line[y][x].state & GLYPH_SET)
1295 xdrawc(x, y, term.line[y][x]);
1296
1297 xdrawcursor();
1298 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1299 XFlush(xw.dis);
1300 }
1301
1302 #else
1303 /* optimized drawing routine */
1304 void
1305 draw(int redraw_all) {
1306 int i, x, y, ox;
1307 Glyph base, new;
1308 char buf[DRAW_BUF_SIZ];
1309
1310 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1311 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
1312 for(y = 0; y < term.row; y++) {
1313 base = term.line[y][0];
1314 i = ox = 0;
1315 for(x = 0; x < term.col; x++) {
1316 new = term.line[y][x];
1317 if(sel.bx!=-1 && new.c && selected(x, y))
1318 new.mode ^= ATTR_REVERSE;
1319 if(i > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1320 i >= DRAW_BUF_SIZ)) {
1321 xdraws(buf, base, ox, y, i);
1322 i = 0;
1323 }
1324 if(new.state & GLYPH_SET) {
1325 if(i == 0) {
1326 ox = x;
1327 base = new;
1328 }
1329 buf[i++] = new.c;
1330 }
1331 }
1332 if(i > 0)
1333 xdraws(buf, base, ox, y, i);
1334 }
1335 xdrawcursor();
1336 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1337 XFlush(xw.dis);
1338 }
1339
1340 #endif
1341
1342 void
1343 expose(XEvent *ev) {
1344 draw(SCREEN_REDRAW);
1345 }
1346
1347 void
1348 xseturgency(int add) {
1349 XWMHints *h = XGetWMHints(xw.dis, xw.win);
1350 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1351 XSetWMHints(xw.dis, xw.win, h);
1352 XFree(h);
1353 }
1354
1355 void
1356 focus(XEvent *ev) {
1357 if((xw.hasfocus = ev->type == FocusIn))
1358 xseturgency(0);
1359 draw(SCREEN_UPDATE);
1360 }
1361
1362 char*
1363 kmap(KeySym k) {
1364 int i;
1365 for(i = 0; i < LEN(key); i++)
1366 if(key[i].k == k)
1367 return (char*)key[i].s;
1368 return NULL;
1369 }
1370
1371 void
1372 kpress(XEvent *ev) {
1373 XKeyEvent *e = &ev->xkey;
1374 KeySym ksym;
1375 char buf[32];
1376 char *customkey;
1377 int len;
1378 int meta;
1379 int shift;
1380
1381 meta = e->state & Mod1Mask;
1382 shift = e->state & ShiftMask;
1383 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1384
1385 if((customkey = kmap(ksym)))
1386 ttywrite(customkey, strlen(customkey));
1387 else if(len > 0) {
1388 buf[sizeof(buf)-1] = '\0';
1389 if(meta && len == 1)
1390 ttywrite("\033", 1);
1391 ttywrite(buf, len);
1392 } else
1393 switch(ksym) {
1394 case XK_Up:
1395 case XK_Down:
1396 case XK_Left:
1397 case XK_Right:
1398 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1399 ttywrite(buf, 3);
1400 break;
1401 case XK_Insert:
1402 if(shift)
1403 selpaste(), draw(1);
1404 break;
1405 default:
1406 fprintf(stderr, "errkey: %d\n", (int)ksym);
1407 break;
1408 }
1409 }
1410
1411 void
1412 resize(XEvent *e) {
1413 int col, row;
1414
1415 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1416 return;
1417
1418 xw.w = e->xconfigure.width;
1419 xw.h = e->xconfigure.height;
1420 xw.bufw = xw.w - 2*BORDER;
1421 xw.bufh = xw.h - 2*BORDER;
1422 col = xw.bufw / xw.cw;
1423 row = xw.bufh / xw.ch;
1424 tresize(col, row);
1425 ttyresize(col, row);
1426 xw.bufh = MAX(1, xw.bufh);
1427 xw.bufw = MAX(1, xw.bufw);
1428 XFreePixmap(xw.dis, xw.buf);
1429 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1430 draw(SCREEN_REDRAW);
1431 }
1432
1433 void
1434 run(void) {
1435 XEvent ev;
1436 fd_set rfd;
1437 int xfd = XConnectionNumber(xw.dis);
1438
1439 for(;;) {
1440 FD_ZERO(&rfd);
1441 FD_SET(cmdfd, &rfd);
1442 FD_SET(xfd, &rfd);
1443 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1444 if(errno == EINTR)
1445 continue;
1446 die("select failed: %s\n", SERRNO);
1447 }
1448 if(FD_ISSET(cmdfd, &rfd)) {
1449 ttyread();
1450 draw(SCREEN_UPDATE);
1451 }
1452 while(XPending(xw.dis)) {
1453 XNextEvent(xw.dis, &ev);
1454 if(handler[ev.type])
1455 (handler[ev.type])(&ev);
1456 }
1457 }
1458 }
1459
1460 int
1461 main(int argc, char *argv[]) {
1462 if(argc == 2 && !strncmp("-v", argv[1], 3))
1463 die("st-" VERSION ", (c) 2010 st engineers\n");
1464 else if(argc != 1)
1465 die("usage: st [-v]\n");
1466 setlocale(LC_CTYPE, "");
1467 tnew(80, 24);
1468 ttynew();
1469 xinit();
1470 selinit();
1471 run();
1472 return 0;
1473 }