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9ca032f5a34a221787ca53235fc5021e9ffd2cb0
[st.git] / st.c
1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <locale.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/ioctl.h>
14 #include <sys/select.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <X11/Xlib.h>
20 #include <X11/keysym.h>
21 #include <X11/Xutil.h>
22
23 #if defined(LINUX)
24 #include <pty.h>
25 #elif defined(OPENBSD)
26 #include <util.h>
27 #elif defined(FREEBSD)
28 #include <libutil.h>
29 #endif
30
31 /* Arbitrary sizes */
32 #define ESC_TITLE_SIZ 256
33 #define ESC_BUF_SIZ 256
34 #define ESC_ARG_SIZ 16
35 #define DRAW_BUF_SIZ 1024
36
37 #define SERRNO strerror(errno)
38 #define MIN(a, b) ((a) < (b) ? (a) : (b))
39 #define MAX(a, b) ((a) < (b) ? (b) : (a))
40 #define LEN(a) (sizeof(a) / sizeof(a[0]))
41 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
42 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
43 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
44 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
45 #define IS_SET(flag) (term.mode & (flag))
46
47 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
48 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
49 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
50 CURSOR_SAVE, CURSOR_LOAD };
51 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
52 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
53 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
54 enum { SCREEN_UPDATE, SCREEN_REDRAW };
55
56 typedef struct {
57 char c; /* character code */
58 char mode; /* attribute flags */
59 int fg; /* foreground */
60 int bg; /* background */
61 char state; /* state flags */
62 } Glyph;
63
64 typedef Glyph* Line;
65
66 typedef struct {
67 Glyph attr; /* current char attributes */
68 int x;
69 int y;
70 } TCursor;
71
72 /* CSI Escape sequence structs */
73 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
74 typedef struct {
75 char buf[ESC_BUF_SIZ]; /* raw string */
76 int len; /* raw string length */
77 char priv;
78 int arg[ESC_ARG_SIZ];
79 int narg; /* nb of args */
80 char mode;
81 } CSIEscape;
82
83 /* Internal representation of the screen */
84 typedef struct {
85 int row; /* nb row */
86 int col; /* nb col */
87 Line* line; /* screen */
88 TCursor c; /* cursor */
89 char hidec;
90 int top; /* top scroll limit */
91 int bot; /* bottom scroll limit */
92 int mode; /* terminal mode flags */
93 int esc; /* escape state flags */
94 char title[ESC_TITLE_SIZ];
95 int titlelen;
96 } Term;
97
98 /* Purely graphic info */
99 typedef struct {
100 Display* dis;
101 Window win;
102 Pixmap buf;
103 int scr;
104 int w; /* window width */
105 int h; /* window height */
106 int bufw; /* pixmap width */
107 int bufh; /* pixmap height */
108 int ch; /* char height */
109 int cw; /* char width */
110 } XWindow;
111
112 typedef struct {
113 KeySym k;
114 char s[ESC_BUF_SIZ];
115 } Key;
116
117 /* Drawing Context */
118 typedef struct {
119 unsigned long col[256];
120 XFontStruct* font;
121 XFontStruct* bfont;
122 GC gc;
123 } DC;
124
125 #include "config.h"
126
127 static void die(const char *errstr, ...);
128 static void draw(int);
129 static void execsh(void);
130 static void sigchld(int);
131 static void run(void);
132
133 static void csidump(void);
134 static void csihandle(void);
135 static void csiparse(void);
136 static void csireset(void);
137
138 static void tclearregion(int, int, int, int);
139 static void tcursor(int);
140 static void tdeletechar(int);
141 static void tdeleteline(int);
142 static void tinsertblank(int);
143 static void tinsertblankline(int);
144 static void tmoveto(int, int);
145 static void tnew(int, int);
146 static void tnewline(void);
147 static void tputtab(void);
148 static void tputc(char);
149 static void tputs(char*, int);
150 static void treset(void);
151 static void tresize(int, int);
152 static void tscroll(void);
153 static void tscrollup(int);
154 static void tscrolldown(int);
155 static void tsetattr(int*, int);
156 static void tsetchar(char);
157 static void tsetscroll(int, int);
158
159 static void ttynew(void);
160 static void ttyread(void);
161 static void ttyresize(int, int);
162 static void ttywrite(const char *, size_t);
163
164 static void xbell(void);
165 static void xdraws(char *, Glyph, int, int, int);
166 static void xhints(void);
167 static void xclear(int, int, int, int);
168 static void xcursor(int);
169 static void xinit(void);
170 static void xloadcols(void);
171
172 static void expose(XEvent *);
173 static char* kmap(KeySym);
174 static void kpress(XEvent *);
175 static void resize(XEvent *);
176
177 static void (*handler[LASTEvent])(XEvent *) = {
178 [KeyPress] = kpress,
179 [Expose] = expose,
180 [ConfigureNotify] = resize
181 };
182
183 /* Globals */
184 static DC dc;
185 static XWindow xw;
186 static Term term;
187 static CSIEscape escseq;
188 static int cmdfd;
189 static pid_t pid;
190 static int running;
191
192 #ifdef DEBUG
193 void
194 tdump(void) {
195 int row, col;
196 Glyph c;
197
198 for(row = 0; row < term.row; row++) {
199 for(col = 0; col < term.col; col++) {
200 if(col == term.c.x && row == term.c.y)
201 putchar('#');
202 else {
203 c = term.line[row][col];
204 putchar(c.state & GLYPH_SET ? c.c : '.');
205 }
206 }
207 putchar('\n');
208 }
209 }
210 #endif
211
212 void
213 die(const char *errstr, ...) {
214 va_list ap;
215
216 va_start(ap, errstr);
217 vfprintf(stderr, errstr, ap);
218 va_end(ap);
219 exit(EXIT_FAILURE);
220 }
221
222 void
223 execsh(void) {
224 char *args[3] = {getenv("SHELL"), "-i", NULL};
225 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
226 putenv("TERM=" TNAME);
227 execvp(args[0], args);
228 }
229
230 void
231 xbell(void) { /* visual bell */
232 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
233 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
234 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
235 /* usleep(30000); */
236 draw(SCREEN_REDRAW);
237 }
238
239 void
240 sigchld(int a) {
241 int stat = 0;
242 if(waitpid(pid, &stat, 0) < 0)
243 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
244 if(WIFEXITED(stat))
245 exit(WEXITSTATUS(stat));
246 else
247 exit(EXIT_FAILURE);
248 }
249
250 void
251 ttynew(void) {
252 int m, s;
253
254 /* seems to work fine on linux, openbsd and freebsd */
255 struct winsize w = {term.row, term.col, 0, 0};
256 if(openpty(&m, &s, NULL, NULL, &w) < 0)
257 die("openpty failed: %s\n", SERRNO);
258
259 switch(pid = fork()) {
260 case -1:
261 die("fork failed\n");
262 break;
263 case 0:
264 setsid(); /* create a new process group */
265 dup2(s, STDIN_FILENO);
266 dup2(s, STDOUT_FILENO);
267 dup2(s, STDERR_FILENO);
268 if(ioctl(s, TIOCSCTTY, NULL) < 0)
269 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
270 close(s);
271 close(m);
272 execsh();
273 break;
274 default:
275 close(s);
276 cmdfd = m;
277 signal(SIGCHLD, sigchld);
278 }
279 }
280
281 void
282 dump(char c) {
283 static int col;
284 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
285 if(++col % 10 == 0)
286 fprintf(stderr, "\n");
287 }
288
289 void
290 ttyread(void) {
291 char buf[BUFSIZ] = {0};
292 int ret;
293
294 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
295 die("Couldn't read from shell: %s\n", SERRNO);
296 else
297 tputs(buf, ret);
298 }
299
300 void
301 ttywrite(const char *s, size_t n) {
302 if(write(cmdfd, s, n) == -1)
303 die("write error on tty: %s\n", SERRNO);
304 }
305
306 void
307 ttyresize(int x, int y) {
308 struct winsize w;
309
310 w.ws_row = term.row;
311 w.ws_col = term.col;
312 w.ws_xpixel = w.ws_ypixel = 0;
313 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
314 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
315 }
316
317 void
318 tcursor(int mode) {
319 static TCursor c;
320
321 if(mode == CURSOR_SAVE)
322 c = term.c;
323 else if(mode == CURSOR_LOAD)
324 term.c = c, tmoveto(c.x, c.y);
325 }
326
327 void
328 treset(void) {
329 term.c.attr.mode = ATTR_NULL;
330 term.c.attr.fg = DefaultFG;
331 term.c.attr.bg = DefaultBG;
332 term.c.x = term.c.y = 0;
333 term.hidec = 0;
334 term.top = 0, term.bot = term.row - 1;
335 term.mode = MODE_WRAP;
336 tclearregion(0, 0, term.col-1, term.row-1);
337 }
338
339 void
340 tnew(int col, int row) {
341 /* screen size */
342 term.row = row, term.col = col;
343 term.top = 0, term.bot = term.row - 1;
344 /* mode */
345 term.mode = MODE_WRAP;
346 /* cursor */
347 term.c.attr.mode = ATTR_NULL;
348 term.c.attr.fg = DefaultFG;
349 term.c.attr.bg = DefaultBG;
350 term.c.x = term.c.y = 0;
351 term.hidec = 0;
352 /* allocate screen */
353 term.line = calloc(term.row, sizeof(Line));
354 for(row = 0 ; row < term.row; row++)
355 term.line[row] = calloc(term.col, sizeof(Glyph));
356 }
357
358 /* TODO: Replace with scrollup/scolldown */
359 void
360 tscroll(void) {
361 Line temp = term.line[term.top];
362 int i;
363
364 for(i = term.top; i < term.bot; i++)
365 term.line[i] = term.line[i+1];
366 memset(temp, 0, sizeof(Glyph) * term.col);
367 term.line[term.bot] = temp;
368 }
369
370 void
371 tscrolldown (int n) {
372 int i;
373 Line temp;
374
375 LIMIT(n, 0, term.bot-term.top+1);
376
377 for(i = 0; i < n; i++)
378 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
379
380 for(i = term.bot; i >= term.top+n; i--) {
381 temp = term.line[i];
382 term.line[i] = term.line[i-n];
383 term.line[i-n] = temp;
384 }
385 }
386
387 void
388 tscrollup (int n) {
389 int i;
390 Line temp;
391 LIMIT(n, 0, term.bot-term.top+1);
392
393 for(i = 0; i < n; i++)
394 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
395
396 for(i = term.top; i <= term.bot-n; i++) {
397 temp = term.line[i];
398 term.line[i] = term.line[i+n];
399 term.line[i+n] = temp;
400 }
401 }
402
403 void
404 tnewline(void) {
405 int y = term.c.y + 1;
406 if(y > term.bot)
407 tscroll(), y = term.bot;
408 tmoveto(0, y);
409 }
410
411 void
412 csiparse(void) {
413 /* int noarg = 1; */
414 char *p = escseq.buf;
415
416 escseq.narg = 0;
417 if(*p == '?')
418 escseq.priv = 1, p++;
419
420 while(p < escseq.buf+escseq.len) {
421 while(isdigit(*p)) {
422 escseq.arg[escseq.narg] *= 10;
423 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
424 }
425 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
426 escseq.narg++, p++;
427 else {
428 escseq.mode = *p;
429 escseq.narg++;
430 return;
431 }
432 }
433 }
434
435 void
436 tmoveto(int x, int y) {
437 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
438 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
439 }
440
441 void
442 tsetchar(char c) {
443 term.line[term.c.y][term.c.x] = term.c.attr;
444 term.line[term.c.y][term.c.x].c = c;
445 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
446 }
447
448 void
449 tclearregion(int x1, int y1, int x2, int y2) {
450 int y, temp;
451
452 if(x1 > x2)
453 temp = x1, x1 = x2, x2 = temp;
454 if(y1 > y2)
455 temp = y1, y1 = y2, y2 = temp;
456
457 LIMIT(x1, 0, term.col-1);
458 LIMIT(x2, 0, term.col-1);
459 LIMIT(y1, 0, term.row-1);
460 LIMIT(y2, 0, term.row-1);
461
462 for(y = y1; y <= y2; y++)
463 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
464 }
465
466 void
467 tdeletechar(int n) {
468 int src = term.c.x + n;
469 int dst = term.c.x;
470 int size = term.col - src;
471
472 if(src >= term.col) {
473 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
474 return;
475 }
476 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
477 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
478 }
479
480 void
481 tinsertblank(int n) {
482 int src = term.c.x;
483 int dst = src + n;
484 int size = term.col - dst;
485
486 if(dst >= term.col) {
487 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
488 return;
489 }
490 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
491 tclearregion(src, term.c.y, dst - 1, term.c.y);
492 }
493
494 void
495 tinsertblankline(int n) {
496 int i;
497 Line blank;
498 int bot = term.bot;
499
500 if(term.c.y > term.bot)
501 bot = term.row - 1;
502 else if(term.c.y < term.top)
503 bot = term.top - 1;
504 if(term.c.y + n >= bot) {
505 tclearregion(0, term.c.y, term.col-1, bot);
506 return;
507 }
508 for(i = bot; i >= term.c.y+n; i--) {
509 /* swap deleted line <-> blanked line */
510 blank = term.line[i];
511 term.line[i] = term.line[i-n];
512 term.line[i-n] = blank;
513 /* blank it */
514 memset(blank, 0, term.col * sizeof(Glyph));
515 }
516 }
517
518 void
519 tdeleteline(int n) {
520 int i;
521 Line blank;
522 int bot = term.bot;
523
524 if(term.c.y > term.bot)
525 bot = term.row - 1;
526 else if(term.c.y < term.top)
527 bot = term.top - 1;
528 if(term.c.y + n >= bot) {
529 tclearregion(0, term.c.y, term.col-1, bot);
530 return;
531 }
532 for(i = term.c.y; i <= bot-n; i++) {
533 /* swap deleted line <-> blanked line */
534 blank = term.line[i];
535 term.line[i] = term.line[i+n];
536 term.line[i+n] = blank;
537 /* blank it */
538 memset(blank, 0, term.col * sizeof(Glyph));
539 }
540 }
541
542 void
543 tsetattr(int *attr, int l) {
544 int i;
545
546 for(i = 0; i < l; i++) {
547 switch(attr[i]) {
548 case 0:
549 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
550 term.c.attr.fg = DefaultFG;
551 term.c.attr.bg = DefaultBG;
552 break;
553 case 1:
554 term.c.attr.mode |= ATTR_BOLD;
555 break;
556 case 4:
557 term.c.attr.mode |= ATTR_UNDERLINE;
558 break;
559 case 7:
560 term.c.attr.mode |= ATTR_REVERSE;
561 break;
562 case 22:
563 term.c.attr.mode &= ~ATTR_BOLD;
564 break;
565 case 24:
566 term.c.attr.mode &= ~ATTR_UNDERLINE;
567 break;
568 case 27:
569 term.c.attr.mode &= ~ATTR_REVERSE;
570 break;
571 case 38:
572 if (i + 2 < l && attr[i + 1] == 5) {
573 i += 2;
574 if (BETWEEN(attr[i], 0, 255))
575 term.c.attr.fg = attr[i];
576 else
577 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
578 }
579 else
580 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
581 break;
582 case 39:
583 term.c.attr.fg = DefaultFG;
584 break;
585 case 48:
586 if (i + 2 < l && attr[i + 1] == 5) {
587 i += 2;
588 if (BETWEEN(attr[i], 0, 255))
589 term.c.attr.bg = attr[i];
590 else
591 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
592 }
593 else
594 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
595 break;
596 case 49:
597 term.c.attr.bg = DefaultBG;
598 break;
599 default:
600 if(BETWEEN(attr[i], 30, 37))
601 term.c.attr.fg = attr[i] - 30;
602 else if(BETWEEN(attr[i], 40, 47))
603 term.c.attr.bg = attr[i] - 40;
604 else if(BETWEEN(attr[i], 90, 97))
605 term.c.attr.fg = attr[i] - 90 + 8;
606 else if(BETWEEN(attr[i], 100, 107))
607 term.c.attr.fg = attr[i] - 100 + 8;
608 else
609 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
610 break;
611 }
612 }
613 }
614
615 void
616 tsetscroll(int t, int b) {
617 int temp;
618
619 LIMIT(t, 0, term.row-1);
620 LIMIT(b, 0, term.row-1);
621 if(t > b) {
622 temp = t;
623 t = b;
624 b = temp;
625 }
626 term.top = t;
627 term.bot = b;
628 }
629
630 void
631 csihandle(void) {
632 switch(escseq.mode) {
633 default:
634 unknown:
635 printf("erresc: unknown csi ");
636 csidump();
637 /* die(""); */
638 break;
639 case '@': /* ICH -- Insert <n> blank char */
640 DEFAULT(escseq.arg[0], 1);
641 tinsertblank(escseq.arg[0]);
642 break;
643 case 'A': /* CUU -- Cursor <n> Up */
644 case 'e':
645 DEFAULT(escseq.arg[0], 1);
646 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
647 break;
648 case 'B': /* CUD -- Cursor <n> Down */
649 DEFAULT(escseq.arg[0], 1);
650 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
651 break;
652 case 'C': /* CUF -- Cursor <n> Forward */
653 case 'a':
654 DEFAULT(escseq.arg[0], 1);
655 tmoveto(term.c.x+escseq.arg[0], term.c.y);
656 break;
657 case 'D': /* CUB -- Cursor <n> Backward */
658 DEFAULT(escseq.arg[0], 1);
659 tmoveto(term.c.x-escseq.arg[0], term.c.y);
660 break;
661 case 'E': /* CNL -- Cursor <n> Down and first col */
662 DEFAULT(escseq.arg[0], 1);
663 tmoveto(0, term.c.y+escseq.arg[0]);
664 break;
665 case 'F': /* CPL -- Cursor <n> Up and first col */
666 DEFAULT(escseq.arg[0], 1);
667 tmoveto(0, term.c.y-escseq.arg[0]);
668 break;
669 case 'G': /* CHA -- Move to <col> */
670 case '`': /* XXX: HPA -- same? */
671 DEFAULT(escseq.arg[0], 1);
672 tmoveto(escseq.arg[0]-1, term.c.y);
673 break;
674 case 'H': /* CUP -- Move to <row> <col> */
675 case 'f': /* XXX: HVP -- same? */
676 DEFAULT(escseq.arg[0], 1);
677 DEFAULT(escseq.arg[1], 1);
678 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
679 break;
680 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
681 case 'J': /* ED -- Clear screen */
682 switch(escseq.arg[0]) {
683 case 0: /* below */
684 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
685 break;
686 case 1: /* above */
687 tclearregion(0, 0, term.c.x, term.c.y);
688 break;
689 case 2: /* all */
690 tclearregion(0, 0, term.col-1, term.row-1);
691 break;
692 case 3: /* XXX: erase saved lines (xterm) */
693 default:
694 goto unknown;
695 }
696 break;
697 case 'K': /* EL -- Clear line */
698 switch(escseq.arg[0]) {
699 case 0: /* right */
700 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
701 break;
702 case 1: /* left */
703 tclearregion(0, term.c.y, term.c.x, term.c.y);
704 break;
705 case 2: /* all */
706 tclearregion(0, term.c.y, term.col-1, term.c.y);
707 break;
708 }
709 break;
710 case 'S': /* SU -- Scroll <n> line up */
711 DEFAULT(escseq.arg[0], 1);
712 tscrollup(escseq.arg[0]);
713 break;
714 case 'T': /* SD -- Scroll <n> line down */
715 DEFAULT(escseq.arg[0], 1);
716 tscrolldown(escseq.arg[0]);
717 break;
718 case 'L': /* IL -- Insert <n> blank lines */
719 DEFAULT(escseq.arg[0], 1);
720 tinsertblankline(escseq.arg[0]);
721 break;
722 case 'l': /* RM -- Reset Mode */
723 if(escseq.priv) {
724 switch(escseq.arg[0]) {
725 case 1:
726 term.mode &= ~MODE_APPKEYPAD;
727 break;
728 case 7:
729 term.mode &= ~MODE_WRAP;
730 break;
731 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
732 break;
733 case 25:
734 term.hidec = 1;
735 break;
736 case 1048: /* XXX: no alt. screen to erase/save */
737 case 1049:
738 tcursor(CURSOR_LOAD);
739 tclearregion(0, 0, term.col-1, term.row-1);
740 break;
741 default:
742 goto unknown;
743 }
744 } else {
745 switch(escseq.arg[0]) {
746 case 4:
747 term.mode &= ~MODE_INSERT;
748 break;
749 default:
750 goto unknown;
751 }
752 }
753 break;
754 case 'M': /* DL -- Delete <n> lines */
755 DEFAULT(escseq.arg[0], 1);
756 tdeleteline(escseq.arg[0]);
757 break;
758 case 'X': /* ECH -- Erase <n> char */
759 DEFAULT(escseq.arg[0], 1);
760 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
761 break;
762 case 'P': /* DCH -- Delete <n> char */
763 DEFAULT(escseq.arg[0], 1);
764 tdeletechar(escseq.arg[0]);
765 break;
766 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
767 case 'd': /* VPA -- Move to <row> */
768 DEFAULT(escseq.arg[0], 1);
769 tmoveto(term.c.x, escseq.arg[0]-1);
770 break;
771 case 'h': /* SM -- Set terminal mode */
772 if(escseq.priv) {
773 switch(escseq.arg[0]) {
774 case 1:
775 term.mode |= MODE_APPKEYPAD;
776 break;
777 case 7:
778 term.mode |= MODE_WRAP;
779 break;
780 case 12: /* att610 -- Start blinking cursor (IGNORED) */
781 break;
782 case 25:
783 term.hidec = 0;
784 break;
785 case 1048:
786 case 1049: /* XXX: no alt. screen to erase/save */
787 tcursor(CURSOR_SAVE);
788 tclearregion(0, 0, term.col-1, term.row-1);
789 break;
790 default: goto unknown;
791 }
792 } else {
793 switch(escseq.arg[0]) {
794 case 4:
795 term.mode |= MODE_INSERT;
796 break;
797 default: goto unknown;
798 }
799 };
800 break;
801 case 'm': /* SGR -- Terminal attribute (color) */
802 tsetattr(escseq.arg, escseq.narg);
803 break;
804 case 'r': /* DECSTBM -- Set Scrolling Region */
805 if(escseq.priv)
806 goto unknown;
807 else {
808 DEFAULT(escseq.arg[0], 1);
809 DEFAULT(escseq.arg[1], term.row);
810 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
811 }
812 break;
813 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
814 tcursor(CURSOR_SAVE);
815 break;
816 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
817 tcursor(CURSOR_LOAD);
818 break;
819 }
820 }
821
822 void
823 csidump(void) {
824 int i;
825 printf("ESC [ %s", escseq.priv ? "? " : "");
826 if(escseq.narg)
827 for(i = 0; i < escseq.narg; i++)
828 printf("%d ", escseq.arg[i]);
829 if(escseq.mode)
830 putchar(escseq.mode);
831 putchar('\n');
832 }
833
834 void
835 csireset(void) {
836 memset(&escseq, 0, sizeof(escseq));
837 }
838
839 void
840 tputtab(void) {
841 int space = TAB - term.c.x % TAB;
842 tmoveto(term.c.x + space, term.c.y);
843 }
844
845 void
846 tputc(char c) {
847 if(term.esc & ESC_START) {
848 if(term.esc & ESC_CSI) {
849 escseq.buf[escseq.len++] = c;
850 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
851 term.esc = 0;
852 csiparse(), csihandle();
853 }
854 } else if(term.esc & ESC_OSC) {
855 if(c == ';') {
856 term.titlelen = 0;
857 term.esc = ESC_START | ESC_TITLE;
858 }
859 } else if(term.esc & ESC_TITLE) {
860 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
861 term.esc = 0;
862 term.title[term.titlelen] = '\0';
863 XStoreName(xw.dis, xw.win, term.title);
864 } else {
865 term.title[term.titlelen++] = c;
866 }
867 } else if(term.esc & ESC_ALTCHARSET) {
868 switch(c) {
869 case '0': /* Line drawing crap */
870 term.c.attr.mode |= ATTR_GFX;
871 break;
872 case 'B': /* Back to regular text */
873 term.c.attr.mode &= ~ATTR_GFX;
874 break;
875 default:
876 printf("esc unhandled charset: ESC ( %c\n", c);
877 }
878 term.esc = 0;
879 } else {
880 switch(c) {
881 case '[':
882 term.esc |= ESC_CSI;
883 break;
884 case ']':
885 term.esc |= ESC_OSC;
886 break;
887 case '(':
888 term.esc |= ESC_ALTCHARSET;
889 break;
890 case 'A':
891 tmoveto(term.c.x, term.c.y-1);
892 term.esc = 0;
893 break;
894 case 'B':
895 tmoveto(term.c.x, term.c.y+1);
896 term.esc = 0;
897 break;
898 case 'C':
899 tmoveto(term.c.x+1, term.c.y);
900 term.esc = 0;
901 break;
902 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
903 tmoveto(term.c.x-1, term.c.y);
904 term.esc = 0;
905 break;
906 case 'E': /* NEL -- Next line */
907 tnewline();
908 term.esc = 0;
909 break;
910 case 'M': /* RI -- Reverse index */
911 if(term.c.y == term.top)
912 tscrolldown(1);
913 else
914 tmoveto(term.c.x, term.c.y-1);
915 term.esc = 0;
916 break;
917 case 'c': /* RIS -- Reset to inital state */
918 treset();
919 term.esc = 0;
920 break;
921 case '=': /* DECPAM */
922 term.mode |= MODE_APPKEYPAD;
923 term.esc = 0;
924 break;
925 case '>': /* DECPNM */
926 term.mode &= ~MODE_APPKEYPAD;
927 term.esc = 0;
928 break;
929 case '7':
930 tcursor(CURSOR_SAVE);
931 term.esc = 0;
932 break;
933 case '8':
934 tcursor(CURSOR_LOAD);
935 term.esc = 0;
936 break;
937 default:
938 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
939 term.esc = 0;
940 }
941 }
942 } else {
943 switch(c) {
944 case '\t':
945 tputtab();
946 break;
947 case '\b':
948 tmoveto(term.c.x-1, term.c.y);
949 break;
950 case '\r':
951 tmoveto(0, term.c.y);
952 break;
953 case '\n':
954 tnewline();
955 break;
956 case '\a':
957 xbell();
958 break;
959 case '\033':
960 csireset();
961 term.esc = ESC_START;
962 break;
963 default:
964 tsetchar(c);
965 if(term.c.x+1 < term.col) {
966 tmoveto(term.c.x+1, term.c.y);
967 } else if(IS_SET(MODE_WRAP))
968 tnewline();
969 break;
970 }
971 }
972 }
973
974 void
975 tputs(char *s, int len) {
976 for(; len > 0; len--)
977 tputc(*s++);
978 }
979
980 void
981 tresize(int col, int row) {
982 int i;
983 int minrow = MIN(row, term.row);
984 int mincol = MIN(col, term.col);
985
986 if(col < 1 || row < 1)
987 return;
988
989 /* free uneeded rows */
990 for(i = row; i < term.row; i++)
991 free(term.line[i]);
992
993 /* resize to new height */
994 term.line = realloc(term.line, row * sizeof(Line));
995
996 /* resize each row to new width, zero-pad if needed */
997 for(i = 0; i < minrow; i++) {
998 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
999 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
1000 }
1001
1002 /* allocate any new rows */
1003 for(/* i == minrow */; i < row; i++)
1004 term.line[i] = calloc(col, sizeof(Glyph));
1005
1006 LIMIT(term.c.x, 0, col-1);
1007 LIMIT(term.c.y, 0, row-1);
1008 LIMIT(term.top, 0, row-1);
1009 LIMIT(term.bot, 0, row-1);
1010
1011 term.bot = row-1;
1012 term.col = col, term.row = row;
1013 }
1014
1015 void
1016 xloadcols(void) {
1017 int i, r, g, b;
1018 XColor color;
1019 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1020 unsigned long white = WhitePixel(xw.dis, xw.scr);
1021
1022 for(i = 0; i < 16; i++) {
1023 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1024 dc.col[i] = white;
1025 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1026 } else
1027 dc.col[i] = color.pixel;
1028 }
1029
1030 /* same colors as xterm */
1031 for(r = 0; r < 6; r++)
1032 for(g = 0; g < 6; g++)
1033 for(b = 0; b < 6; b++) {
1034 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1035 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1036 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1037 if (!XAllocColor(xw.dis, cmap, &color)) {
1038 dc.col[i] = white;
1039 fprintf(stderr, "Could not allocate color %d\n", i);
1040 } else
1041 dc.col[i] = color.pixel;
1042 i++;
1043 }
1044
1045 for(r = 0; r < 24; r++, i++) {
1046 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1047 if (!XAllocColor(xw.dis, cmap, &color)) {
1048 dc.col[i] = white;
1049 fprintf(stderr, "Could not allocate color %d\n", i);
1050 } else
1051 dc.col[i] = color.pixel;
1052 }
1053 }
1054
1055 void
1056 xclear(int x1, int y1, int x2, int y2) {
1057 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1058 XFillRectangle(xw.dis, xw.buf, dc.gc,
1059 x1 * xw.cw, y1 * xw.ch,
1060 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1061 }
1062
1063 void
1064 xhints(void)
1065 {
1066 XClassHint class = {TNAME, TNAME};
1067 XWMHints wm = {.flags = InputHint, .input = 1};
1068 XSizeHints size = {
1069 .flags = PSize | PResizeInc | PBaseSize,
1070 .height = xw.h,
1071 .width = xw.w,
1072 .height_inc = xw.ch,
1073 .width_inc = xw.cw,
1074 .base_height = 2*BORDER,
1075 .base_width = 2*BORDER,
1076 };
1077 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1078 }
1079
1080 void
1081 xinit(void) {
1082 if(!(xw.dis = XOpenDisplay(NULL)))
1083 die("Can't open display\n");
1084 xw.scr = XDefaultScreen(xw.dis);
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 }