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merged tscroll() with tscrollup().
[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 tscrollup(int);
153 static void tscrolldown(int);
154 static void tsetattr(int*, int);
155 static void tsetchar(char);
156 static void tsetscroll(int, int);
157
158 static void ttynew(void);
159 static void ttyread(void);
160 static void ttyresize(int, int);
161 static void ttywrite(const char *, size_t);
162
163 static void xbell(void);
164 static void xdraws(char *, Glyph, int, int, int);
165 static void xhints(void);
166 static void xclear(int, int, int, int);
167 static void xcursor(int);
168 static void xinit(void);
169 static void xloadcols(void);
170
171 static void expose(XEvent *);
172 static char* kmap(KeySym);
173 static void kpress(XEvent *);
174 static void resize(XEvent *);
175
176 static void (*handler[LASTEvent])(XEvent *) = {
177 [KeyPress] = kpress,
178 [Expose] = expose,
179 [ConfigureNotify] = resize
180 };
181
182 /* Globals */
183 static DC dc;
184 static XWindow xw;
185 static Term term;
186 static CSIEscape escseq;
187 static int cmdfd;
188 static pid_t pid;
189 static int running;
190
191 #ifdef DEBUG
192 void
193 tdump(void) {
194 int row, col;
195 Glyph c;
196
197 for(row = 0; row < term.row; row++) {
198 for(col = 0; col < term.col; col++) {
199 if(col == term.c.x && row == term.c.y)
200 putchar('#');
201 else {
202 c = term.line[row][col];
203 putchar(c.state & GLYPH_SET ? c.c : '.');
204 }
205 }
206 putchar('\n');
207 }
208 }
209 #endif
210
211 void
212 die(const char *errstr, ...) {
213 va_list ap;
214
215 va_start(ap, errstr);
216 vfprintf(stderr, errstr, ap);
217 va_end(ap);
218 exit(EXIT_FAILURE);
219 }
220
221 void
222 execsh(void) {
223 char *args[3] = {getenv("SHELL"), "-i", NULL};
224 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
225 putenv("TERM=" TNAME);
226 execvp(args[0], args);
227 }
228
229 void
230 xbell(void) { /* visual bell */
231 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
232 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
233 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
234 /* usleep(30000); */
235 draw(SCREEN_REDRAW);
236 }
237
238 void
239 sigchld(int a) {
240 int stat = 0;
241 if(waitpid(pid, &stat, 0) < 0)
242 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
243 if(WIFEXITED(stat))
244 exit(WEXITSTATUS(stat));
245 else
246 exit(EXIT_FAILURE);
247 }
248
249 void
250 ttynew(void) {
251 int m, s;
252
253 /* seems to work fine on linux, openbsd and freebsd */
254 struct winsize w = {term.row, term.col, 0, 0};
255 if(openpty(&m, &s, NULL, NULL, &w) < 0)
256 die("openpty failed: %s\n", SERRNO);
257
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 void
358 tscrolldown (int n) {
359 int i;
360 Line temp;
361
362 LIMIT(n, 0, term.bot-term.top+1);
363
364 for(i = 0; i < n; i++)
365 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
366
367 for(i = term.bot; i >= term.top+n; i--) {
368 temp = term.line[i];
369 term.line[i] = term.line[i-n];
370 term.line[i-n] = temp;
371 }
372 }
373
374 void
375 tscrollup (int n) {
376 int i;
377 Line temp;
378 LIMIT(n, 0, term.bot-term.top+1);
379
380 for(i = 0; i < n; i++)
381 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
382
383 for(i = term.top; i <= term.bot-n; i++) {
384 temp = term.line[i];
385 term.line[i] = term.line[i+n];
386 term.line[i+n] = temp;
387 }
388 }
389
390 void
391 tnewline(void) {
392 int y = term.c.y + 1;
393 if(y > term.bot)
394 tscrollup(1), y = term.bot;
395 tmoveto(0, y);
396 }
397
398 void
399 csiparse(void) {
400 /* int noarg = 1; */
401 char *p = escseq.buf;
402
403 escseq.narg = 0;
404 if(*p == '?')
405 escseq.priv = 1, p++;
406
407 while(p < escseq.buf+escseq.len) {
408 while(isdigit(*p)) {
409 escseq.arg[escseq.narg] *= 10;
410 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
411 }
412 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
413 escseq.narg++, p++;
414 else {
415 escseq.mode = *p;
416 escseq.narg++;
417 return;
418 }
419 }
420 }
421
422 void
423 tmoveto(int x, int y) {
424 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
425 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
426 }
427
428 void
429 tsetchar(char c) {
430 term.line[term.c.y][term.c.x] = term.c.attr;
431 term.line[term.c.y][term.c.x].c = c;
432 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
433 }
434
435 void
436 tclearregion(int x1, int y1, int x2, int y2) {
437 int y, temp;
438
439 if(x1 > x2)
440 temp = x1, x1 = x2, x2 = temp;
441 if(y1 > y2)
442 temp = y1, y1 = y2, y2 = temp;
443
444 LIMIT(x1, 0, term.col-1);
445 LIMIT(x2, 0, term.col-1);
446 LIMIT(y1, 0, term.row-1);
447 LIMIT(y2, 0, term.row-1);
448
449 for(y = y1; y <= y2; y++)
450 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
451 }
452
453 void
454 tdeletechar(int n) {
455 int src = term.c.x + n;
456 int dst = term.c.x;
457 int size = term.col - src;
458
459 if(src >= term.col) {
460 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
461 return;
462 }
463 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
464 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
465 }
466
467 void
468 tinsertblank(int n) {
469 int src = term.c.x;
470 int dst = src + n;
471 int size = term.col - dst;
472
473 if(dst >= term.col) {
474 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
475 return;
476 }
477 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
478 tclearregion(src, term.c.y, dst - 1, term.c.y);
479 }
480
481 void
482 tinsertblankline(int n) {
483 int i;
484 Line blank;
485 int bot = term.bot;
486
487 if(term.c.y > term.bot)
488 bot = term.row - 1;
489 else if(term.c.y < term.top)
490 bot = term.top - 1;
491 if(term.c.y + n >= bot) {
492 tclearregion(0, term.c.y, term.col-1, bot);
493 return;
494 }
495 for(i = bot; i >= term.c.y+n; i--) {
496 /* swap deleted line <-> blanked line */
497 blank = term.line[i];
498 term.line[i] = term.line[i-n];
499 term.line[i-n] = blank;
500 /* blank it */
501 memset(blank, 0, term.col * sizeof(Glyph));
502 }
503 }
504
505 void
506 tdeleteline(int n) {
507 int i;
508 Line blank;
509 int bot = term.bot;
510
511 if(term.c.y > term.bot)
512 bot = term.row - 1;
513 else if(term.c.y < term.top)
514 bot = term.top - 1;
515 if(term.c.y + n >= bot) {
516 tclearregion(0, term.c.y, term.col-1, bot);
517 return;
518 }
519 for(i = term.c.y; i <= bot-n; i++) {
520 /* swap deleted line <-> blanked line */
521 blank = term.line[i];
522 term.line[i] = term.line[i+n];
523 term.line[i+n] = blank;
524 /* blank it */
525 memset(blank, 0, term.col * sizeof(Glyph));
526 }
527 }
528
529 void
530 tsetattr(int *attr, int l) {
531 int i;
532
533 for(i = 0; i < l; i++) {
534 switch(attr[i]) {
535 case 0:
536 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
537 term.c.attr.fg = DefaultFG;
538 term.c.attr.bg = DefaultBG;
539 break;
540 case 1:
541 term.c.attr.mode |= ATTR_BOLD;
542 break;
543 case 4:
544 term.c.attr.mode |= ATTR_UNDERLINE;
545 break;
546 case 7:
547 term.c.attr.mode |= ATTR_REVERSE;
548 break;
549 case 22:
550 term.c.attr.mode &= ~ATTR_BOLD;
551 break;
552 case 24:
553 term.c.attr.mode &= ~ATTR_UNDERLINE;
554 break;
555 case 27:
556 term.c.attr.mode &= ~ATTR_REVERSE;
557 break;
558 case 38:
559 if (i + 2 < l && attr[i + 1] == 5) {
560 i += 2;
561 if (BETWEEN(attr[i], 0, 255))
562 term.c.attr.fg = attr[i];
563 else
564 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
565 }
566 else
567 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
568 break;
569 case 39:
570 term.c.attr.fg = DefaultFG;
571 break;
572 case 48:
573 if (i + 2 < l && attr[i + 1] == 5) {
574 i += 2;
575 if (BETWEEN(attr[i], 0, 255))
576 term.c.attr.bg = attr[i];
577 else
578 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
579 }
580 else
581 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
582 break;
583 case 49:
584 term.c.attr.bg = DefaultBG;
585 break;
586 default:
587 if(BETWEEN(attr[i], 30, 37))
588 term.c.attr.fg = attr[i] - 30;
589 else if(BETWEEN(attr[i], 40, 47))
590 term.c.attr.bg = attr[i] - 40;
591 else if(BETWEEN(attr[i], 90, 97))
592 term.c.attr.fg = attr[i] - 90 + 8;
593 else if(BETWEEN(attr[i], 100, 107))
594 term.c.attr.fg = attr[i] - 100 + 8;
595 else
596 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
597 break;
598 }
599 }
600 }
601
602 void
603 tsetscroll(int t, int b) {
604 int temp;
605
606 LIMIT(t, 0, term.row-1);
607 LIMIT(b, 0, term.row-1);
608 if(t > b) {
609 temp = t;
610 t = b;
611 b = temp;
612 }
613 term.top = t;
614 term.bot = b;
615 }
616
617 void
618 csihandle(void) {
619 switch(escseq.mode) {
620 default:
621 unknown:
622 printf("erresc: unknown csi ");
623 csidump();
624 /* die(""); */
625 break;
626 case '@': /* ICH -- Insert <n> blank char */
627 DEFAULT(escseq.arg[0], 1);
628 tinsertblank(escseq.arg[0]);
629 break;
630 case 'A': /* CUU -- Cursor <n> Up */
631 case 'e':
632 DEFAULT(escseq.arg[0], 1);
633 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
634 break;
635 case 'B': /* CUD -- Cursor <n> Down */
636 DEFAULT(escseq.arg[0], 1);
637 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
638 break;
639 case 'C': /* CUF -- Cursor <n> Forward */
640 case 'a':
641 DEFAULT(escseq.arg[0], 1);
642 tmoveto(term.c.x+escseq.arg[0], term.c.y);
643 break;
644 case 'D': /* CUB -- Cursor <n> Backward */
645 DEFAULT(escseq.arg[0], 1);
646 tmoveto(term.c.x-escseq.arg[0], term.c.y);
647 break;
648 case 'E': /* CNL -- Cursor <n> Down and first col */
649 DEFAULT(escseq.arg[0], 1);
650 tmoveto(0, term.c.y+escseq.arg[0]);
651 break;
652 case 'F': /* CPL -- Cursor <n> Up and first col */
653 DEFAULT(escseq.arg[0], 1);
654 tmoveto(0, term.c.y-escseq.arg[0]);
655 break;
656 case 'G': /* CHA -- Move to <col> */
657 case '`': /* XXX: HPA -- same? */
658 DEFAULT(escseq.arg[0], 1);
659 tmoveto(escseq.arg[0]-1, term.c.y);
660 break;
661 case 'H': /* CUP -- Move to <row> <col> */
662 case 'f': /* XXX: HVP -- same? */
663 DEFAULT(escseq.arg[0], 1);
664 DEFAULT(escseq.arg[1], 1);
665 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
666 break;
667 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
668 case 'J': /* ED -- Clear screen */
669 switch(escseq.arg[0]) {
670 case 0: /* below */
671 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
672 break;
673 case 1: /* above */
674 tclearregion(0, 0, term.c.x, term.c.y);
675 break;
676 case 2: /* all */
677 tclearregion(0, 0, term.col-1, term.row-1);
678 break;
679 case 3: /* XXX: erase saved lines (xterm) */
680 default:
681 goto unknown;
682 }
683 break;
684 case 'K': /* EL -- Clear line */
685 switch(escseq.arg[0]) {
686 case 0: /* right */
687 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
688 break;
689 case 1: /* left */
690 tclearregion(0, term.c.y, term.c.x, term.c.y);
691 break;
692 case 2: /* all */
693 tclearregion(0, term.c.y, term.col-1, term.c.y);
694 break;
695 }
696 break;
697 case 'S': /* SU -- Scroll <n> line up */
698 DEFAULT(escseq.arg[0], 1);
699 tscrollup(escseq.arg[0]);
700 break;
701 case 'T': /* SD -- Scroll <n> line down */
702 DEFAULT(escseq.arg[0], 1);
703 tscrolldown(escseq.arg[0]);
704 break;
705 case 'L': /* IL -- Insert <n> blank lines */
706 DEFAULT(escseq.arg[0], 1);
707 tinsertblankline(escseq.arg[0]);
708 break;
709 case 'l': /* RM -- Reset Mode */
710 if(escseq.priv) {
711 switch(escseq.arg[0]) {
712 case 1:
713 term.mode &= ~MODE_APPKEYPAD;
714 break;
715 case 7:
716 term.mode &= ~MODE_WRAP;
717 break;
718 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
719 break;
720 case 25:
721 term.hidec = 1;
722 break;
723 case 1048: /* XXX: no alt. screen to erase/save */
724 case 1049:
725 tcursor(CURSOR_LOAD);
726 tclearregion(0, 0, term.col-1, term.row-1);
727 break;
728 default:
729 goto unknown;
730 }
731 } else {
732 switch(escseq.arg[0]) {
733 case 4:
734 term.mode &= ~MODE_INSERT;
735 break;
736 default:
737 goto unknown;
738 }
739 }
740 break;
741 case 'M': /* DL -- Delete <n> lines */
742 DEFAULT(escseq.arg[0], 1);
743 tdeleteline(escseq.arg[0]);
744 break;
745 case 'X': /* ECH -- Erase <n> char */
746 DEFAULT(escseq.arg[0], 1);
747 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
748 break;
749 case 'P': /* DCH -- Delete <n> char */
750 DEFAULT(escseq.arg[0], 1);
751 tdeletechar(escseq.arg[0]);
752 break;
753 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
754 case 'd': /* VPA -- Move to <row> */
755 DEFAULT(escseq.arg[0], 1);
756 tmoveto(term.c.x, escseq.arg[0]-1);
757 break;
758 case 'h': /* SM -- Set terminal mode */
759 if(escseq.priv) {
760 switch(escseq.arg[0]) {
761 case 1:
762 term.mode |= MODE_APPKEYPAD;
763 break;
764 case 7:
765 term.mode |= MODE_WRAP;
766 break;
767 case 12: /* att610 -- Start blinking cursor (IGNORED) */
768 break;
769 case 25:
770 term.hidec = 0;
771 break;
772 case 1048:
773 case 1049: /* XXX: no alt. screen to erase/save */
774 tcursor(CURSOR_SAVE);
775 tclearregion(0, 0, term.col-1, term.row-1);
776 break;
777 default: goto unknown;
778 }
779 } else {
780 switch(escseq.arg[0]) {
781 case 4:
782 term.mode |= MODE_INSERT;
783 break;
784 default: goto unknown;
785 }
786 };
787 break;
788 case 'm': /* SGR -- Terminal attribute (color) */
789 tsetattr(escseq.arg, escseq.narg);
790 break;
791 case 'r': /* DECSTBM -- Set Scrolling Region */
792 if(escseq.priv)
793 goto unknown;
794 else {
795 DEFAULT(escseq.arg[0], 1);
796 DEFAULT(escseq.arg[1], term.row);
797 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
798 }
799 break;
800 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
801 tcursor(CURSOR_SAVE);
802 break;
803 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
804 tcursor(CURSOR_LOAD);
805 break;
806 }
807 }
808
809 void
810 csidump(void) {
811 int i;
812 printf("ESC [ %s", escseq.priv ? "? " : "");
813 if(escseq.narg)
814 for(i = 0; i < escseq.narg; i++)
815 printf("%d ", escseq.arg[i]);
816 if(escseq.mode)
817 putchar(escseq.mode);
818 putchar('\n');
819 }
820
821 void
822 csireset(void) {
823 memset(&escseq, 0, sizeof(escseq));
824 }
825
826 void
827 tputtab(void) {
828 int space = TAB - term.c.x % TAB;
829 tmoveto(term.c.x + space, term.c.y);
830 }
831
832 void
833 tputc(char c) {
834 if(term.esc & ESC_START) {
835 if(term.esc & ESC_CSI) {
836 escseq.buf[escseq.len++] = c;
837 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
838 term.esc = 0;
839 csiparse(), csihandle();
840 }
841 } else if(term.esc & ESC_OSC) {
842 if(c == ';') {
843 term.titlelen = 0;
844 term.esc = ESC_START | ESC_TITLE;
845 }
846 } else if(term.esc & ESC_TITLE) {
847 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
848 term.esc = 0;
849 term.title[term.titlelen] = '\0';
850 XStoreName(xw.dis, xw.win, term.title);
851 } else {
852 term.title[term.titlelen++] = c;
853 }
854 } else if(term.esc & ESC_ALTCHARSET) {
855 switch(c) {
856 case '0': /* Line drawing crap */
857 term.c.attr.mode |= ATTR_GFX;
858 break;
859 case 'B': /* Back to regular text */
860 term.c.attr.mode &= ~ATTR_GFX;
861 break;
862 default:
863 printf("esc unhandled charset: ESC ( %c\n", c);
864 }
865 term.esc = 0;
866 } else {
867 switch(c) {
868 case '[':
869 term.esc |= ESC_CSI;
870 break;
871 case ']':
872 term.esc |= ESC_OSC;
873 break;
874 case '(':
875 term.esc |= ESC_ALTCHARSET;
876 break;
877 case 'A':
878 tmoveto(term.c.x, term.c.y-1);
879 term.esc = 0;
880 break;
881 case 'B':
882 tmoveto(term.c.x, term.c.y+1);
883 term.esc = 0;
884 break;
885 case 'C':
886 tmoveto(term.c.x+1, term.c.y);
887 term.esc = 0;
888 break;
889 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
890 tmoveto(term.c.x-1, term.c.y);
891 term.esc = 0;
892 break;
893 case 'E': /* NEL -- Next line */
894 tnewline();
895 term.esc = 0;
896 break;
897 case 'M': /* RI -- Reverse index */
898 if(term.c.y == term.top)
899 tscrolldown(1);
900 else
901 tmoveto(term.c.x, term.c.y-1);
902 term.esc = 0;
903 break;
904 case 'c': /* RIS -- Reset to inital state */
905 treset();
906 term.esc = 0;
907 break;
908 case '=': /* DECPAM */
909 term.mode |= MODE_APPKEYPAD;
910 term.esc = 0;
911 break;
912 case '>': /* DECPNM */
913 term.mode &= ~MODE_APPKEYPAD;
914 term.esc = 0;
915 break;
916 case '7':
917 tcursor(CURSOR_SAVE);
918 term.esc = 0;
919 break;
920 case '8':
921 tcursor(CURSOR_LOAD);
922 term.esc = 0;
923 break;
924 default:
925 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
926 term.esc = 0;
927 }
928 }
929 } else {
930 switch(c) {
931 case '\t':
932 tputtab();
933 break;
934 case '\b':
935 tmoveto(term.c.x-1, term.c.y);
936 break;
937 case '\r':
938 tmoveto(0, term.c.y);
939 break;
940 case '\n':
941 tnewline();
942 break;
943 case '\a':
944 xbell();
945 break;
946 case '\033':
947 csireset();
948 term.esc = ESC_START;
949 break;
950 default:
951 tsetchar(c);
952 if(term.c.x+1 < term.col) {
953 tmoveto(term.c.x+1, term.c.y);
954 } else if(IS_SET(MODE_WRAP))
955 tnewline();
956 break;
957 }
958 }
959 }
960
961 void
962 tputs(char *s, int len) {
963 for(; len > 0; len--)
964 tputc(*s++);
965 }
966
967 void
968 tresize(int col, int row) {
969 int i;
970 int minrow = MIN(row, term.row);
971 int mincol = MIN(col, term.col);
972
973 if(col < 1 || row < 1)
974 return;
975
976 /* free uneeded rows */
977 for(i = row; i < term.row; i++)
978 free(term.line[i]);
979
980 /* resize to new height */
981 term.line = realloc(term.line, row * sizeof(Line));
982
983 /* resize each row to new width, zero-pad if needed */
984 for(i = 0; i < minrow; i++) {
985 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
986 memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
987 }
988
989 /* allocate any new rows */
990 for(/* i == minrow */; i < row; i++)
991 term.line[i] = calloc(col, sizeof(Glyph));
992
993 LIMIT(term.c.x, 0, col-1);
994 LIMIT(term.c.y, 0, row-1);
995 LIMIT(term.top, 0, row-1);
996 LIMIT(term.bot, 0, row-1);
997
998 term.bot = row-1;
999 term.col = col, term.row = row;
1000 }
1001
1002 void
1003 xloadcols(void) {
1004 int i, r, g, b;
1005 XColor color;
1006 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1007 unsigned long white = WhitePixel(xw.dis, xw.scr);
1008
1009 for(i = 0; i < 16; i++) {
1010 if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
1011 dc.col[i] = white;
1012 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1013 } else
1014 dc.col[i] = color.pixel;
1015 }
1016
1017 /* same colors as xterm */
1018 for(r = 0; r < 6; r++)
1019 for(g = 0; g < 6; g++)
1020 for(b = 0; b < 6; b++) {
1021 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1022 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1023 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1024 if (!XAllocColor(xw.dis, cmap, &color)) {
1025 dc.col[i] = white;
1026 fprintf(stderr, "Could not allocate color %d\n", i);
1027 } else
1028 dc.col[i] = color.pixel;
1029 i++;
1030 }
1031
1032 for(r = 0; r < 24; r++, i++) {
1033 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1034 if (!XAllocColor(xw.dis, cmap, &color)) {
1035 dc.col[i] = white;
1036 fprintf(stderr, "Could not allocate color %d\n", i);
1037 } else
1038 dc.col[i] = color.pixel;
1039 }
1040 }
1041
1042 void
1043 xclear(int x1, int y1, int x2, int y2) {
1044 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1045 XFillRectangle(xw.dis, xw.buf, dc.gc,
1046 x1 * xw.cw, y1 * xw.ch,
1047 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1048 }
1049
1050 void
1051 xhints(void)
1052 {
1053 XClassHint class = {TNAME, TNAME};
1054 XWMHints wm = {.flags = InputHint, .input = 1};
1055 XSizeHints size = {
1056 .flags = PSize | PResizeInc | PBaseSize,
1057 .height = xw.h,
1058 .width = xw.w,
1059 .height_inc = xw.ch,
1060 .width_inc = xw.cw,
1061 .base_height = 2*BORDER,
1062 .base_width = 2*BORDER,
1063 };
1064 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1065 }
1066
1067 void
1068 xinit(void) {
1069 if(!(xw.dis = XOpenDisplay(NULL)))
1070 die("Can't open display\n");
1071 xw.scr = XDefaultScreen(xw.dis);
1072
1073 /* font */
1074 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1075 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1076
1077 /* XXX: Assuming same size for bold font */
1078 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1079 xw.ch = dc.font->ascent + dc.font->descent;
1080
1081 /* colors */
1082 xloadcols();
1083
1084 term.c.attr.fg = DefaultFG;
1085 term.c.attr.bg = DefaultBG;
1086 term.c.attr.mode = ATTR_NULL;
1087 /* windows */
1088 xw.h = term.row * xw.ch + 2*BORDER;
1089 xw.w = term.col * xw.cw + 2*BORDER;
1090 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1091 xw.w, xw.h, 0,
1092 dc.col[DefaultBG],
1093 dc.col[DefaultBG]);
1094 xw.bufw = xw.w - 2*BORDER;
1095 xw.bufh = xw.h - 2*BORDER;
1096 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1097 /* gc */
1098 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1099 XMapWindow(xw.dis, xw.win);
1100 xhints();
1101 XStoreName(xw.dis, xw.win, "st");
1102 XSync(xw.dis, 0);
1103 }
1104
1105 void
1106 xdraws(char *s, Glyph base, int x, int y, int len) {
1107 unsigned long xfg, xbg;
1108 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1109 int i;
1110
1111 if(base.mode & ATTR_REVERSE)
1112 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1113 else
1114 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1115
1116 XSetBackground(xw.dis, dc.gc, xbg);
1117 XSetForeground(xw.dis, dc.gc, xfg);
1118
1119 if(base.mode & ATTR_GFX)
1120 for(i = 0; i < len; i++)
1121 s[i] = gfx[(int)s[i]];
1122
1123 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1124 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1125
1126 if(base.mode & ATTR_UNDERLINE)
1127 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1128 }
1129
1130 void
1131 xcursor(int mode) {
1132 static int oldx = 0;
1133 static int oldy = 0;
1134 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1135
1136 LIMIT(oldx, 0, term.col-1);
1137 LIMIT(oldy, 0, term.row-1);
1138
1139 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1140 g.c = term.line[term.c.y][term.c.x].c;
1141
1142 /* remove the old cursor */
1143 if(term.line[oldy][oldx].state & GLYPH_SET)
1144 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1145 else
1146 xclear(oldx, oldy, oldx, oldy);
1147
1148 /* draw the new one */
1149 if(mode == CURSOR_DRAW) {
1150 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1151 oldx = term.c.x, oldy = term.c.y;
1152 }
1153 }
1154
1155 #ifdef DEBUG
1156 /* basic drawing routines */
1157 void
1158 xdrawc(int x, int y, Glyph g) {
1159 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1160 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1161 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1162 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1163 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1164 }
1165
1166 void
1167 draw(int dummy) {
1168 int x, y;
1169
1170 xclear(0, 0, term.col-1, term.row-1);
1171 for(y = 0; y < term.row; y++)
1172 for(x = 0; x < term.col; x++)
1173 if(term.line[y][x].state & GLYPH_SET)
1174 xdrawc(x, y, term.line[y][x]);
1175
1176 if(!term.hidec)
1177 xcursor(CURSOR_DRAW);
1178 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1179 XFlush(xw.dis);
1180 }
1181
1182 #else
1183 /* optimized drawing routine */
1184 void
1185 draw(int redraw_all) {
1186 int i, x, y, ox;
1187 Glyph base, new;
1188 char buf[DRAW_BUF_SIZ];
1189
1190 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1191 XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
1192 for(y = 0; y < term.row; y++) {
1193 base = term.line[y][0];
1194 i = ox = 0;
1195 for(x = 0; x < term.col; x++) {
1196 new = term.line[y][x];
1197 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1198 buf[i++] = new.c;
1199 else {
1200 xdraws(buf, base, ox, y, i);
1201 buf[0] = new.c;
1202 i = 1;
1203 ox = x;
1204 base = new;
1205 }
1206 }
1207 xdraws(buf, base, ox, y, i);
1208 }
1209 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1210 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1211 XFlush(xw.dis);
1212 }
1213
1214 #endif
1215
1216 void
1217 expose(XEvent *ev) {
1218 draw(SCREEN_REDRAW);
1219 }
1220
1221 char*
1222 kmap(KeySym k) {
1223 int i;
1224 for(i = 0; i < LEN(key); i++)
1225 if(key[i].k == k)
1226 return (char*)key[i].s;
1227 return NULL;
1228 }
1229
1230 void
1231 kpress(XEvent *ev) {
1232 XKeyEvent *e = &ev->xkey;
1233 KeySym ksym;
1234 char buf[32];
1235 char *customkey;
1236 int len;
1237 int meta;
1238 int shift;
1239
1240 meta = e->state & Mod1Mask;
1241 shift = e->state & ShiftMask;
1242 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1243
1244 if((customkey = kmap(ksym)))
1245 ttywrite(customkey, strlen(customkey));
1246 else if(len > 0) {
1247 buf[sizeof(buf)-1] = '\0';
1248 if(meta && len == 1)
1249 ttywrite("\033", 1);
1250 ttywrite(buf, len);
1251 } else
1252 switch(ksym) {
1253 case XK_Up:
1254 case XK_Down:
1255 case XK_Left:
1256 case XK_Right:
1257 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
1258 ttywrite(buf, 3);
1259 break;
1260 case XK_Insert:
1261 if(shift)
1262 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1263 break;
1264 default:
1265 fprintf(stderr, "errkey: %d\n", (int)ksym);
1266 break;
1267 }
1268 }
1269
1270 void
1271 resize(XEvent *e) {
1272 int col, row;
1273
1274 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1275 return;
1276
1277 xw.w = e->xconfigure.width;
1278 xw.h = e->xconfigure.height;
1279 xw.bufw = xw.w - 2*BORDER;
1280 xw.bufh = xw.h - 2*BORDER;
1281 col = xw.bufw / xw.cw;
1282 row = xw.bufh / xw.ch;
1283 tresize(col, row);
1284 ttyresize(col, row);
1285 XFreePixmap(xw.dis, xw.buf);
1286 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1287 draw(SCREEN_REDRAW);
1288 }
1289
1290 void
1291 run(void) {
1292 XEvent ev;
1293 fd_set rfd;
1294 int xfd = XConnectionNumber(xw.dis);
1295
1296 running = 1;
1297 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1298 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1299
1300 while(running) {
1301 FD_ZERO(&rfd);
1302 FD_SET(cmdfd, &rfd);
1303 FD_SET(xfd, &rfd);
1304 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1305 if(errno == EINTR)
1306 continue;
1307 die("select failed: %s\n", SERRNO);
1308 }
1309 if(FD_ISSET(cmdfd, &rfd)) {
1310 ttyread();
1311 draw(SCREEN_UPDATE);
1312 }
1313 while(XPending(xw.dis)) {
1314 XNextEvent(xw.dis, &ev);
1315 if(handler[ev.type])
1316 (handler[ev.type])(&ev);
1317 }
1318 }
1319 }
1320
1321 int
1322 main(int argc, char *argv[]) {
1323 if(argc == 2 && !strncmp("-v", argv[1], 3))
1324 die("st-" VERSION ", (c) 2010 st engineers\n");
1325 else if(argc != 1)
1326 die("usage: st [-v]\n");
1327 setlocale(LC_CTYPE, "");
1328 tnew(80, 24);
1329 ttynew();
1330 xinit();
1331 run();
1332 return 0;
1333 }