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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 #define TNAME "xterm"
24
25 /* Arbitrary sizes */
26 #define ESC_TITLE_SIZ 256
27 #define ESC_BUF_SIZ 256
28 #define ESC_ARG_SIZ 16
29 #define DRAW_BUF_SIZ 1024
30
31 #define SERRNO strerror(errno)
32 #define MIN(a, b) ((a) < (b) ? (a) : (b))
33 #define MAX(a, b) ((a) < (b) ? (b) : (a))
34 #define LEN(a) (sizeof(a) / sizeof(a[0]))
35 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
36 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
37 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
38 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
39
40 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
41 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
42 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW, CURSOR_SAVE, CURSOR_LOAD };
43 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
44 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
45 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
46 enum { SCREEN_UPDATE, SCREEN_REDRAW };
47
48 typedef struct {
49 char c; /* character code */
50 char mode; /* attribute flags */
51 int fg; /* foreground */
52 int bg; /* background */
53 char state; /* state flags */
54 } Glyph;
55
56 typedef Glyph* Line;
57
58 typedef struct {
59 Glyph attr; /* current char attributes */
60 int x;
61 int y;
62 } TCursor;
63
64 /* CSI Escape sequence structs */
65 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
66 typedef struct {
67 char buf[ESC_BUF_SIZ]; /* raw string */
68 int len; /* raw string length */
69 char priv;
70 int arg[ESC_ARG_SIZ];
71 int narg; /* nb of args */
72 char mode;
73 } CSIEscape;
74
75 /* Internal representation of the screen */
76 typedef struct {
77 int row; /* nb row */
78 int col; /* nb col */
79 Line* line; /* screen */
80 TCursor c; /* cursor */
81 char hidec;
82 int top; /* top scroll limit */
83 int bot; /* bottom scroll limit */
84 int mode; /* terminal mode flags */
85 int esc; /* escape state flags */
86 char title[ESC_TITLE_SIZ];
87 int titlelen;
88 } Term;
89
90 /* Purely graphic info */
91 typedef struct {
92 Display* dis;
93 Window win;
94 int scr;
95 int w; /* window width */
96 int h; /* window height */
97 int ch; /* char height */
98 int cw; /* char width */
99 } XWindow;
100
101 typedef struct {
102 KeySym k;
103 char s[ESC_BUF_SIZ];
104 } Key;
105
106 #include "config.h"
107
108 /* Drawing Context */
109 typedef struct {
110 unsigned long col[LEN(colorname)];
111 XFontStruct* font;
112 XFontStruct* bfont;
113 GC gc;
114 } DC;
115
116 static void die(const char *errstr, ...);
117 static void draw(int);
118 static void execsh(void);
119 static void sigchld(int);
120 static void run(void);
121
122 static void csidump(void);
123 static void csihandle(void);
124 static void csiparse(void);
125 static void csireset(void);
126
127 static void tclearregion(int, int, int, int);
128 static void tcursor(int);
129 static void tmovecursor(int);
130 static void tdeletechar(int);
131 static void tdeleteline(int);
132 static void tinsertblank(int);
133 static void tinsertblankline(int);
134 static void tmoveto(int, int);
135 static void tnew(int, int);
136 static void tnewline(void);
137 static void tputc(char);
138 static void tputs(char*, int);
139 static void treset(void);
140 static void tresize(int, int);
141 static void tscroll(void);
142 static void tscrollup(int);
143 static void tscrolldown(int);
144 static void tsetattr(int*, int);
145 static void tsetchar(char);
146 static void tsetscroll(int, int);
147
148 static void ttynew(void);
149 static void ttyread(void);
150 static void ttyresize(int, int);
151 static void ttywrite(const char *, size_t);
152
153 static unsigned long xgetcol(const char *);
154 static void xclear(int, int, int, int);
155 static void xcursor(int);
156 static void xinit(void);
157 static void xscroll(void);
158
159 static void expose(XEvent *);
160 static char* kmap(KeySym);
161 static void kpress(XEvent *);
162 static void resize(XEvent *);
163
164 static void (*handler[LASTEvent])(XEvent *) = {
165 [KeyPress] = kpress,
166 [Expose] = expose,
167 [ConfigureNotify] = resize
168 };
169
170 /* Globals */
171 static DC dc;
172 static XWindow xw;
173 static Term term;
174 static CSIEscape escseq;
175 static int cmdfd;
176 static pid_t pid;
177 static int running;
178
179 #ifdef DEBUG
180 void
181 tdump(void) {
182 int row, col;
183 Glyph c;
184
185 for(row = 0; row < term.row; row++) {
186 for(col = 0; col < term.col; col++) {
187 if(col == term.c.x && row == term.c.y)
188 putchar('#');
189 else {
190 c = term.line[row][col];
191 putchar(c.state & GLYPH_SET ? c.c : '.');
192 }
193 }
194 putchar('\n');
195 }
196 }
197 #endif
198
199 void
200 die(const char *errstr, ...) {
201 va_list ap;
202
203 va_start(ap, errstr);
204 vfprintf(stderr, errstr, ap);
205 va_end(ap);
206 exit(EXIT_FAILURE);
207 }
208
209 void
210 execsh(void) {
211 char *args[3] = {SHELL, "-i", NULL};
212 putenv("TERM=" TNAME);
213 execvp(SHELL, args);
214 }
215
216 void
217 xbell(void) { /* visual bell */
218 XRectangle r = { 0, 0, xw.w, xw.h };
219 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
220 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
221 /* usleep(30000); */
222 draw(SCREEN_REDRAW);
223 }
224
225 void
226 sigchld(int a) {
227 int stat = 0;
228 if(waitpid(pid, &stat, 0) < 0)
229 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
230 if(WIFEXITED(stat))
231 exit(WEXITSTATUS(stat));
232 else
233 exit(EXIT_FAILURE);
234 }
235
236 void
237 ttynew(void) {
238 int m, s;
239 char *pts;
240
241 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
242 die("openpt failed: %s\n", SERRNO);
243 if(grantpt(m) < 0)
244 die("grandpt failed: %s\n", SERRNO);
245 if(unlockpt(m) < 0)
246 die("unlockpt failed: %s\n", SERRNO);
247 if(!(pts = ptsname(m)))
248 die("ptsname failed: %s\n", SERRNO);
249 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
250 die("Couldn't open slave: %s\n", SERRNO);
251 fcntl(s, F_SETFL, O_NDELAY);
252 switch(pid = fork()) {
253 case -1:
254 die("fork failed\n");
255 break;
256 case 0:
257 setsid(); /* create a new process group */
258 dup2(s, STDIN_FILENO);
259 dup2(s, STDOUT_FILENO);
260 dup2(s, STDERR_FILENO);
261 if(ioctl(s, TIOCSCTTY, NULL) < 0)
262 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
263 execsh();
264 break;
265 default:
266 close(s);
267 cmdfd = m;
268 signal(SIGCHLD, sigchld);
269 }
270 }
271
272 void
273 dump(char c) {
274 static int col;
275 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
276 if(++col % 10 == 0)
277 fprintf(stderr, "\n");
278 }
279
280 void
281 ttyread(void) {
282 char buf[BUFSIZ] = {0};
283 int ret;
284
285 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
286 die("Couldn't read from shell: %s\n", SERRNO);
287 else
288 tputs(buf, ret);
289 }
290
291 void
292 ttywrite(const char *s, size_t n) {
293 if(write(cmdfd, s, n) == -1)
294 die("write error on tty: %s\n", SERRNO);
295 }
296
297 void
298 ttyresize(int x, int y) {
299 struct winsize w;
300
301 w.ws_row = term.row;
302 w.ws_col = term.col;
303 w.ws_xpixel = w.ws_ypixel = 0;
304 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
305 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
306 }
307
308 void
309 tcursor(int mode) {
310 static TCursor c;
311
312 if(mode == CURSOR_SAVE)
313 c = term.c;
314 else if(mode == CURSOR_LOAD)
315 term.c = c, tmoveto(c.x, c.y);
316 }
317
318 void
319 treset(void) {
320 term.c.attr.mode = ATTR_NULL;
321 term.c.attr.fg = DefaultFG;
322 term.c.attr.bg = DefaultBG;
323 term.c.x = term.c.y = 0;
324 term.hidec = 0;
325 term.top = 0, term.bot = term.row - 1;
326 term.mode = MODE_WRAP;
327 tclearregion(0, 0, term.col-1, term.row-1);
328 }
329
330 void
331 tnew(int col, int row) { /* screen size */
332 term.row = row, term.col = col;
333 term.top = 0, term.bot = term.row - 1;
334 /* mode */
335 term.mode = MODE_WRAP;
336 /* cursor */
337 term.c.attr.mode = ATTR_NULL;
338 term.c.attr.fg = DefaultFG;
339 term.c.attr.bg = DefaultBG;
340 term.c.x = term.c.y = 0;
341 term.hidec = 0;
342 /* allocate screen */
343 term.line = calloc(term.row, sizeof(Line));
344 for(row = 0 ; row < term.row; row++)
345 term.line[row] = calloc(term.col, sizeof(Glyph));
346 }
347
348 /* TODO: Replace with scrollup/scolldown */
349 void
350 tscroll(void) {
351 Line temp = term.line[term.top];
352 int i;
353 /* No dirty flag to set because of xscroll */
354 /* X stuff _before_ the line swapping (results in wrong line index) */
355 xscroll();
356 for(i = term.top; i < term.bot; i++)
357 term.line[i] = term.line[i+1];
358 memset(temp, 0, sizeof(Glyph) * term.col);
359 term.line[term.bot] = temp;
360 }
361
362 void
363 tscrolldown (int n) {
364 int i;
365 Line temp;
366
367 /* TODO: set dirty flag or scroll with some X func */
368 LIMIT(n, 0, term.bot-term.top+1);
369
370 for(i = 0; i < n; i++)
371 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
372
373 for(i = term.bot; i >= term.top+n; i--) {
374 temp = term.line[i];
375 term.line[i] = term.line[i-n];
376 term.line[i-n] = temp;
377 }
378 }
379
380 void
381 tscrollup (int n) {
382 int i;
383 Line temp;
384 LIMIT(n, 0, term.bot-term.top+1);
385
386 /* TODO: set dirty flag or scroll with some X func */
387 for(i = 0; i < n; i++)
388 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
389
390 for(i = term.top; i <= term.bot-n; i++) {
391 temp = term.line[i];
392 term.line[i] = term.line[i+n];
393 term.line[i+n] = temp;
394 }
395 }
396
397 void
398 tnewline(void) {
399 int y = term.c.y + 1;
400 if(y > term.bot)
401 tscroll(), y = term.bot;
402 tmoveto(0, y);
403 }
404
405 void
406 csiparse(void) {
407 /* int noarg = 1; */
408 char *p = escseq.buf;
409
410 escseq.narg = 0;
411 if(*p == '?')
412 escseq.priv = 1, p++;
413
414 while(p < escseq.buf+escseq.len) {
415 while(isdigit(*p)) {
416 escseq.arg[escseq.narg] *= 10;
417 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
418 }
419 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
420 escseq.narg++, p++;
421 else {
422 escseq.mode = *p;
423 escseq.narg++;
424 return;
425 }
426 }
427 }
428
429 void
430 tmoveto(int x, int y) {
431 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
432 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
433 }
434
435 void
436 tmovecursor(int dir) {
437 int xf = term.c.x, yf = term.c.y;
438
439 switch(dir) {
440 case CURSOR_UP:
441 yf--;
442 break;
443 case CURSOR_DOWN:
444 yf++;
445 break;
446 case CURSOR_LEFT:
447 xf--;
448 if(term.mode & MODE_WRAP && xf < 0) {
449 xf = term.col-1, yf--;
450 if(yf < term.top)
451 yf = term.top, xf = 0;
452 }
453 break;
454 case CURSOR_RIGHT:
455 xf++;
456 if(term.mode & MODE_WRAP && xf >= term.col) {
457 xf = 0, yf++;
458 if(yf > term.bot)
459 yf = term.bot, tscroll();
460 }
461 break;
462 }
463 tmoveto(xf, yf);
464 }
465
466 void
467 tsetchar(char c) {
468 term.line[term.c.y][term.c.x] = term.c.attr;
469 term.line[term.c.y][term.c.x].c = c;
470 term.line[term.c.y][term.c.x].state |= GLYPH_SET | GLYPH_DIRTY;
471 }
472
473 void
474 tclearregion(int x1, int y1, int x2, int y2) {
475 int y, temp;
476
477 if(x1 > x2)
478 temp = x1, x1 = x2, x2 = temp;
479 if(y1 > y2)
480 temp = y1, y1 = y2, y2 = temp;
481
482 LIMIT(x1, 0, term.col-1);
483 LIMIT(x2, 0, term.col-1);
484 LIMIT(y1, 0, term.row-1);
485 LIMIT(y2, 0, term.row-1);
486
487 for(y = y1; y <= y2; y++)
488 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
489
490 xclear(x1, y1, x2, y2);
491 }
492
493 void
494 tdeletechar(int n) {
495 int src = term.c.x + n;
496 int dst = term.c.x;
497 int size = term.col - src;
498
499 if(src >= term.col) {
500 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
501 return;
502 }
503 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
504 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
505 }
506
507 void
508 tinsertblank(int n) {
509 int src = term.c.x;
510 int dst = src + n;
511 int size = term.col - n - src;
512
513 if(dst >= term.col) {
514 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
515 return;
516 }
517 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
518 tclearregion(src, term.c.y, dst, term.c.y);
519 }
520
521 void
522 tsetlinestate(int n, int state) {
523 int i;
524 for(i = 0; i < term.col; i++)
525 term.line[n][i].state |= state;
526 }
527
528 void
529 tinsertblankline(int n) {
530 int i;
531 Line blank;
532 int bot = term.bot;
533
534 if(term.c.y > term.bot)
535 bot = term.row - 1;
536 else if(term.c.y < term.top)
537 bot = term.top - 1;
538 if(term.c.y + n >= bot) {
539 tclearregion(0, term.c.y, term.col-1, bot);
540 return;
541 }
542 for(i = bot; i >= term.c.y+n; i--) {
543 /* swap deleted line <-> blanked line */
544 blank = term.line[i];
545 term.line[i] = term.line[i-n];
546 term.line[i-n] = blank;
547 /* blank it */
548 memset(blank, 0, term.col * sizeof(Glyph));
549 tsetlinestate(i, GLYPH_DIRTY);
550 tsetlinestate(i-n, GLYPH_DIRTY);
551 }
552 }
553
554 void
555 tdeleteline(int n) {
556 int i;
557 Line blank;
558 int bot = term.bot;
559
560 if(term.c.y > term.bot)
561 bot = term.row - 1;
562 else if(term.c.y < term.top)
563 bot = term.top - 1;
564 if(term.c.y + n >= bot) {
565 tclearregion(0, term.c.y, term.col-1, bot);
566 return;
567 }
568 for(i = term.c.y; i <= bot-n; i++) {
569 /* swap deleted line <-> blanked line */
570 blank = term.line[i];
571 term.line[i] = term.line[i+n];
572 term.line[i+n] = blank;
573 /* blank it */
574 memset(blank, 0, term.col * sizeof(Glyph));
575 tsetlinestate(i, GLYPH_DIRTY);
576 tsetlinestate(i-n, GLYPH_DIRTY);
577 }
578 }
579
580 void
581 tsetattr(int *attr, int l) {
582 int i;
583
584 for(i = 0; i < l; i++) {
585 switch(attr[i]) {
586 case 0:
587 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
588 term.c.attr.fg = DefaultFG;
589 term.c.attr.bg = DefaultBG;
590 break;
591 case 1:
592 term.c.attr.mode |= ATTR_BOLD;
593 break;
594 case 4:
595 term.c.attr.mode |= ATTR_UNDERLINE;
596 break;
597 case 7:
598 term.c.attr.mode |= ATTR_REVERSE;
599 break;
600 case 22:
601 term.c.attr.mode &= ~ATTR_BOLD;
602 break;
603 case 24:
604 term.c.attr.mode &= ~ATTR_UNDERLINE;
605 break;
606 case 27:
607 term.c.attr.mode &= ~ATTR_REVERSE;
608 break;
609 case 39:
610 term.c.attr.fg = DefaultFG;
611 break;
612 case 49:
613 term.c.attr.fg = DefaultBG;
614 break;
615 default:
616 if(BETWEEN(attr[i], 30, 37))
617 term.c.attr.fg = attr[i] - 30;
618 else if(BETWEEN(attr[i], 40, 47))
619 term.c.attr.bg = attr[i] - 40;
620 else
621 fprintf(stderr, "erresc: gfx attr %d unkown\n", attr[i]);
622 break;
623 }
624 }
625 }
626
627 void
628 tsetscroll(int t, int b) {
629 int temp;
630
631 LIMIT(t, 0, term.row-1);
632 LIMIT(b, 0, term.row-1);
633 if(t > b) {
634 temp = t;
635 t = b;
636 b = temp;
637 }
638 term.top = t;
639 term.bot = b;
640 }
641
642 void
643 csihandle(void) {
644 switch(escseq.mode) {
645 default:
646 unknown:
647 printf("erresc: unknown csi ");
648 csidump();
649 /* die(""); */
650 break;
651 case '@': /* ICH -- Insert <n> blank char */
652 DEFAULT(escseq.arg[0], 1);
653 tinsertblank(escseq.arg[0]);
654 break;
655 case 'A': /* CUU -- Cursor <n> Up */
656 case 'e':
657 DEFAULT(escseq.arg[0], 1);
658 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
659 break;
660 case 'B': /* CUD -- Cursor <n> Down */
661 DEFAULT(escseq.arg[0], 1);
662 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
663 break;
664 case 'C': /* CUF -- Cursor <n> Forward */
665 case 'a':
666 DEFAULT(escseq.arg[0], 1);
667 tmoveto(term.c.x+escseq.arg[0], term.c.y);
668 break;
669 case 'D': /* CUB -- Cursor <n> Backward */
670 DEFAULT(escseq.arg[0], 1);
671 tmoveto(term.c.x-escseq.arg[0], term.c.y);
672 break;
673 case 'E': /* CNL -- Cursor <n> Down and first col */
674 DEFAULT(escseq.arg[0], 1);
675 tmoveto(0, term.c.y+escseq.arg[0]);
676 break;
677 case 'F': /* CPL -- Cursor <n> Up and first col */
678 DEFAULT(escseq.arg[0], 1);
679 tmoveto(0, term.c.y-escseq.arg[0]);
680 break;
681 case 'G': /* CHA -- Move to <col> */
682 case '`': /* XXX: HPA -- same? */
683 DEFAULT(escseq.arg[0], 1);
684 tmoveto(escseq.arg[0]-1, term.c.y);
685 break;
686 case 'H': /* CUP -- Move to <row> <col> */
687 case 'f': /* XXX: HVP -- same? */
688 DEFAULT(escseq.arg[0], 1);
689 DEFAULT(escseq.arg[1], 1);
690 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
691 break;
692 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
693 case 'J': /* ED -- Clear screen */
694 switch(escseq.arg[0]) {
695 case 0: /* below */
696 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
697 break;
698 case 1: /* above */
699 tclearregion(0, 0, term.c.x, term.c.y);
700 break;
701 case 2: /* all */
702 tclearregion(0, 0, term.col-1, term.row-1);
703 break;
704 case 3: /* XXX: erase saved lines (xterm) */
705 default:
706 goto unknown;
707 }
708 break;
709 case 'K': /* EL -- Clear line */
710 switch(escseq.arg[0]) {
711 case 0: /* right */
712 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
713 break;
714 case 1: /* left */
715 tclearregion(0, term.c.y, term.c.x, term.c.y);
716 break;
717 case 2: /* all */
718 tclearregion(0, term.c.y, term.col-1, term.c.y);
719 break;
720 }
721 break;
722 case 'S': /* SU -- Scroll <n> line up */
723 DEFAULT(escseq.arg[0], 1);
724 tscrollup(escseq.arg[0]);
725 break;
726 case 'T': /* SD -- Scroll <n> line down */
727 DEFAULT(escseq.arg[0], 1);
728 tscrolldown(escseq.arg[0]);
729 break;
730 case 'L': /* IL -- Insert <n> blank lines */
731 DEFAULT(escseq.arg[0], 1);
732 tinsertblankline(escseq.arg[0]);
733 break;
734 case 'l': /* RM -- Reset Mode */
735 if(escseq.priv) {
736 switch(escseq.arg[0]) {
737 case 1:
738 term.mode &= ~MODE_APPKEYPAD;
739 break;
740 case 7:
741 term.mode &= ~MODE_WRAP;
742 break;
743 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
744 break;
745 case 25:
746 term.hidec = 1;
747 break;
748 case 1048: /* XXX: no alt. screen to erase/save */
749 case 1049:
750 tcursor(CURSOR_LOAD);
751 tclearregion(0, 0, term.col-1, term.row-1);
752 break;
753 default:
754 goto unknown;
755 }
756 } else {
757 switch(escseq.arg[0]) {
758 case 4:
759 term.mode &= ~MODE_INSERT;
760 break;
761 default:
762 goto unknown;
763 }
764 }
765 break;
766 case 'M': /* DL -- Delete <n> lines */
767 DEFAULT(escseq.arg[0], 1);
768 tdeleteline(escseq.arg[0]);
769 break;
770 case 'X': /* ECH -- Erase <n> char */
771 DEFAULT(escseq.arg[0], 1);
772 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
773 break;
774 case 'P': /* DCH -- Delete <n> char */
775 DEFAULT(escseq.arg[0], 1);
776 tdeletechar(escseq.arg[0]);
777 break;
778 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
779 case 'd': /* VPA -- Move to <row> */
780 DEFAULT(escseq.arg[0], 1);
781 tmoveto(term.c.x, escseq.arg[0]-1);
782 break;
783 case 'h': /* SM -- Set terminal mode */
784 if(escseq.priv) {
785 switch(escseq.arg[0]) {
786 case 1:
787 term.mode |= MODE_APPKEYPAD;
788 break;
789 case 7:
790 term.mode |= MODE_WRAP;
791 break;
792 case 12: /* att610 -- Start blinking cursor (IGNORED) */
793 break;
794 case 25:
795 term.hidec = 0;
796 break;
797 case 1048:
798 case 1049: /* XXX: no alt. screen to erase/save */
799 tcursor(CURSOR_SAVE);
800 tclearregion(0, 0, term.col-1, term.row-1);
801 break;
802 default: goto unknown;
803 }
804 } else {
805 switch(escseq.arg[0]) {
806 case 4:
807 term.mode |= MODE_INSERT;
808 break;
809 default: goto unknown;
810 }
811 };
812 break;
813 case 'm': /* SGR -- Terminal attribute (color) */
814 tsetattr(escseq.arg, escseq.narg);
815 break;
816 case 'r': /* DECSTBM -- Set Scrolling Region */
817 if(escseq.priv)
818 goto unknown;
819 else {
820 DEFAULT(escseq.arg[0], 1);
821 DEFAULT(escseq.arg[1], term.row);
822 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
823 }
824 break;
825 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
826 tcursor(CURSOR_SAVE);
827 break;
828 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
829 tcursor(CURSOR_LOAD);
830 break;
831 }
832 }
833
834 void
835 csidump(void) {
836 int i;
837 printf("ESC [ %s", escseq.priv ? "? " : "");
838 if(escseq.narg)
839 for(i = 0; i < escseq.narg; i++)
840 printf("%d ", escseq.arg[i]);
841 if(escseq.mode)
842 putchar(escseq.mode);
843 putchar('\n');
844 }
845
846 void
847 csireset(void) {
848 memset(&escseq, 0, sizeof(escseq));
849 }
850
851 void
852 tputtab(void) {
853 int space = TAB - term.c.x % TAB;
854
855 if(term.c.x + space >= term.col)
856 space--;
857
858 for(; space > 0; space--)
859 tmovecursor(CURSOR_RIGHT);
860 }
861
862 void
863 tputc(char c) {
864 /* dump(c); */
865 if(term.esc & ESC_START) {
866 if(term.esc & ESC_CSI) {
867 escseq.buf[escseq.len++] = c;
868 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
869 term.esc = 0;
870 csiparse(), csihandle();
871 }
872 } else if(term.esc & ESC_OSC) {
873 if(c == ';') {
874 term.titlelen = 0;
875 term.esc = ESC_START | ESC_TITLE;
876 }
877 } else if(term.esc & ESC_TITLE) {
878 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
879 term.esc = 0;
880 term.title[term.titlelen] = '\0';
881 XStoreName(xw.dis, xw.win, term.title);
882 } else {
883 term.title[term.titlelen++] = c;
884 }
885 } else if(term.esc & ESC_ALTCHARSET) {
886 switch(c) {
887 case '0': /* Line drawing crap */
888 term.c.attr.mode |= ATTR_GFX;
889 break;
890 case 'B': /* Back to regular text */
891 term.c.attr.mode &= ~ATTR_GFX;
892 break;
893 default:
894 printf("esc unhandled charset: ESC ( %c\n", c);
895 }
896 term.esc = 0;
897 } else {
898 switch(c) {
899 case '[':
900 term.esc |= ESC_CSI;
901 break;
902 case ']':
903 term.esc |= ESC_OSC;
904 break;
905 case '(':
906 term.esc |= ESC_ALTCHARSET;
907 break;
908 case 'A':
909 tmoveto(term.c.x, term.c.y-1);
910 term.esc = 0;
911 break;
912 case 'B':
913 tmoveto(term.c.x, term.c.y+1);
914 term.esc = 0;
915 break;
916 case 'C':
917 tmoveto(term.c.x+1, term.c.y);
918 term.esc = 0;
919 break;
920 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
921 tmoveto(term.c.x-1, term.c.y);
922 term.esc = 0;
923 break;
924 case 'E': /* NEL -- Next line */
925 tnewline();
926 term.esc = 0;
927 break;
928 case 'M': /* RI -- Reverse index */
929 if(term.c.y == term.top)
930 tscrolldown(1);
931 else
932 tmoveto(term.c.x, term.c.y-1);
933 term.esc = 0;
934 break;
935 case 'c': /* RIS -- Reset to inital state */
936 treset();
937 term.esc = 0;
938 break;
939 case '=': /* DECPAM */
940 term.mode |= MODE_APPKEYPAD;
941 term.esc = 0;
942 break;
943 case '>': /* DECPNM */
944 term.mode &= ~MODE_APPKEYPAD;
945 term.esc = 0;
946 break;
947 case '7':
948 tcursor(CURSOR_SAVE);
949 term.esc = 0;
950 break;
951 case '8':
952 tcursor(CURSOR_LOAD);
953 term.esc = 0;
954 break;
955 default:
956 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
957 term.esc = 0;
958 }
959 }
960 } else {
961 switch(c) {
962 case '\t':
963 tputtab();
964 break;
965 case '\b':
966 tmovecursor(CURSOR_LEFT);
967 break;
968 case '\r':
969 tmoveto(0, term.c.y);
970 break;
971 case '\n':
972 tnewline();
973 break;
974 case '\a':
975 xbell();
976 break;
977 case '\033':
978 csireset();
979 term.esc = ESC_START;
980 break;
981 default:
982 tsetchar(c);
983 tmovecursor(CURSOR_RIGHT);
984 break;
985 }
986 }
987 }
988
989 void
990 tputs(char *s, int len) {
991 for(; len > 0; len--)
992 tputc(*s++);
993 }
994
995 void
996 tresize(int col, int row) {
997 int i;
998 Line *line;
999 int minrow = MIN(row, term.row);
1000 int mincol = MIN(col, term.col);
1001
1002 if(col < 1 || row < 1)
1003 return;
1004 /* alloc */
1005 line = calloc(row, sizeof(Line));
1006 for(i = 0 ; i < row; i++)
1007 line[i] = calloc(col, sizeof(Glyph));
1008 /* copy */
1009 for(i = 0 ; i < minrow; i++)
1010 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
1011 /* free */
1012 for(i = 0; i < term.row; i++)
1013 free(term.line[i]);
1014 free(term.line);
1015
1016 LIMIT(term.c.x, 0, col-1);
1017 LIMIT(term.c.y, 0, row-1);
1018 LIMIT(term.top, 0, row-1);
1019 LIMIT(term.bot, 0, row-1);
1020
1021 term.bot = row-1;
1022 term.line = line;
1023 term.col = col, term.row = row;
1024 }
1025
1026 unsigned long
1027 xgetcol(const char *s) {
1028 XColor color;
1029 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1030
1031 if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
1032 color.pixel = WhitePixel(xw.dis, xw.scr);
1033 fprintf(stderr, "Could not allocate color '%s'\n", s);
1034 }
1035 return color.pixel;
1036 }
1037
1038 void
1039 xclear(int x1, int y1, int x2, int y2) {
1040 XClearArea(xw.dis, xw.win,
1041 x1 * xw.cw, y1 * xw.ch,
1042 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
1043 False);
1044 }
1045
1046 void
1047 xscroll(void) {
1048 int srcy = (term.top+1) * xw.ch;
1049 int dsty = term.top * xw.ch;
1050 int height = (term.bot-term.top) * xw.ch;
1051
1052 xcursor(CURSOR_HIDE);
1053 XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
1054 xclear(0, term.bot, term.col-1, term.bot);
1055 }
1056
1057 void
1058 xinit(void) {
1059 XClassHint chint;
1060 XWMHints wmhint;
1061 XSizeHints shint;
1062 char *args[] = {NULL};
1063 int i;
1064
1065 xw.dis = XOpenDisplay(NULL);
1066 xw.scr = XDefaultScreen(xw.dis);
1067 if(!xw.dis)
1068 die("Can't open display\n");
1069
1070 /* font */
1071 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1072 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1073
1074 /* XXX: Assuming same size for bold font */
1075 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1076 xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
1077
1078 /* colors */
1079 for(i = 0; i < LEN(colorname); i++)
1080 dc.col[i] = xgetcol(colorname[i]);
1081
1082 term.c.attr.fg = DefaultFG;
1083 term.c.attr.bg = DefaultBG;
1084 term.c.attr.mode = ATTR_NULL;
1085 /* windows */
1086 xw.h = term.row * xw.ch;
1087 xw.w = term.col * xw.cw;
1088 /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
1089 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1090 xw.w, xw.h, BORDER,
1091 dc.col[DefaultBG],
1092 dc.col[DefaultBG]);
1093 /* gc */
1094 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1095 XMapWindow(xw.dis, xw.win);
1096 /* wm stuff */
1097 chint.res_name = TNAME, chint.res_class = TNAME;
1098 wmhint.input = 1, wmhint.flags = InputHint;
1099 shint.height_inc = xw.ch, shint.width_inc = xw.cw;
1100 shint.height = xw.h, shint.width = xw.w;
1101 shint.flags = PSize | PResizeInc;
1102 XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
1103 XStoreName(xw.dis, xw.win, TNAME);
1104 XSync(xw.dis, 0);
1105 }
1106
1107 void
1108 xdraws(char *s, Glyph base, int x, int y, int len) {
1109 unsigned long xfg, xbg;
1110 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1111 int i;
1112
1113 if(base.mode & ATTR_REVERSE)
1114 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1115 else
1116 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1117
1118 XSetBackground(xw.dis, dc.gc, xbg);
1119 XSetForeground(xw.dis, dc.gc, xfg);
1120
1121 if(base.mode & ATTR_GFX)
1122 for(i = 0; i < len; i++)
1123 s[i] = gfx[s[i]];
1124
1125 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1126 XDrawImageString(xw.dis, xw.win, dc.gc, winx, winy, s, len);
1127
1128 if(base.mode & ATTR_UNDERLINE)
1129 XDrawLine(xw.dis, xw.win, dc.gc, winx, winy+1, winx+width-1, winy+1);
1130 }
1131
1132 void
1133 xcursor(int mode) {
1134 static int oldx = 0;
1135 static int oldy = 0;
1136 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1137
1138 LIMIT(oldx, 0, term.col-1);
1139 LIMIT(oldy, 0, term.row-1);
1140
1141 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1142 g.c = term.line[term.c.y][term.c.x].c;
1143
1144 /* remove the old cursor */
1145 if(term.line[oldy][oldx].state & GLYPH_SET)
1146 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1147 else
1148 xclear(oldx, oldy, oldx, oldy);
1149
1150 /* draw the new one */
1151 if(mode == CURSOR_DRAW) {
1152 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1153 oldx = term.c.x, oldy = term.c.y;
1154 }
1155 }
1156
1157
1158 #ifdef DEBUG
1159 /* basic drawing routines */
1160 void
1161 xdrawc(int x, int y, Glyph g) {
1162 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1163 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1164 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1165 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1166 XDrawImageString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1167 }
1168
1169 void
1170 draw_(int dummy) {
1171 int x, y;
1172
1173 xclear(0, 0, term.col-1, term.row-1);
1174 for(y = 0; y < term.row; y++)
1175 for(x = 0; x < term.col; x++)
1176 if(term.line[y][x].state & GLYPH_SET)
1177 xdrawc(x, y, term.line[y][x]);
1178
1179 if(!term.hidec)
1180 xcursor(CURSOR_DRAW);
1181 }
1182 #endif
1183
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 /* XXX: optimize with GLYPH_DIRTY hint */
1191 for(y = 0; y < term.row; y++) {
1192 base = term.line[y][0];
1193 i = ox = 0;
1194 for(x = 0; x < term.col; x++) {
1195 new = term.line[y][x];
1196 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1197 buf[i++] = new.c;
1198 else {
1199 xdraws(buf, base, ox, y, i);
1200 buf[0] = new.c;
1201 i = 1;
1202 ox = x;
1203 base = new;
1204 }
1205 }
1206 xdraws(buf, base, ox, y, i);
1207 }
1208 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1209 }
1210
1211 void
1212 expose(XEvent *ev) {
1213 draw(SCREEN_REDRAW);
1214 }
1215
1216 char*
1217 kmap(KeySym k) {
1218 int i;
1219 for(i = 0; i < LEN(key); i++)
1220 if(key[i].k == k)
1221 return (char*)key[i].s;
1222 return NULL;
1223 }
1224
1225 void
1226 kpress(XEvent *ev) {
1227 XKeyEvent *e = &ev->xkey;
1228 KeySym ksym;
1229 char buf[32];
1230 char *customkey;
1231 int len;
1232 int meta;
1233 int shift;
1234
1235 meta = e->state & Mod1Mask;
1236 shift = e->state & ShiftMask;
1237 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1238
1239 if(customkey = kmap(ksym))
1240 ttywrite(customkey, strlen(customkey));
1241 else if(len > 0) {
1242 buf[sizeof(buf)-1] = '\0';
1243 if(meta && len == 1)
1244 ttywrite("\033", 1);
1245 ttywrite(buf, len);
1246 } else
1247 switch(ksym) {
1248 case XK_Up:
1249 case XK_Down:
1250 case XK_Left:
1251 case XK_Right:
1252 sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1253 ttywrite(buf, 3);
1254 break;
1255 case XK_Insert:
1256 if(shift)
1257 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1258 break;
1259 default:
1260 fprintf(stderr, "errkey: %d\n", (int)ksym);
1261 break;
1262 }
1263 }
1264
1265 void
1266 resize(XEvent *e) {
1267 int col, row;
1268 col = e->xconfigure.width / xw.cw;
1269 row = e->xconfigure.height / xw.ch;
1270
1271 if(term.col != col || term.row != row) {
1272 tresize(col, row);
1273 ttyresize(col, row);
1274 xw.w = e->xconfigure.width;
1275 xw.h = e->xconfigure.height;
1276 draw(SCREEN_REDRAW);
1277 }
1278 }
1279
1280 void
1281 run(void) {
1282 XEvent ev;
1283 fd_set rfd;
1284 int xfd = XConnectionNumber(xw.dis);
1285
1286 running = 1;
1287 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1288 XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1289
1290 while(running) {
1291 FD_ZERO(&rfd);
1292 FD_SET(cmdfd, &rfd);
1293 FD_SET(xfd, &rfd);
1294 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1295 if(errno == EINTR)
1296 continue;
1297 die("select failed: %s\n", SERRNO);
1298 }
1299 if(FD_ISSET(cmdfd, &rfd)) {
1300 ttyread();
1301 draw(SCREEN_UPDATE);
1302 }
1303 while(XPending(xw.dis)) {
1304 XNextEvent(xw.dis, &ev);
1305 if(handler[ev.type])
1306 (handler[ev.type])(&ev);
1307 }
1308 }
1309 }
1310
1311 int
1312 main(int argc, char *argv[]) {
1313 if(argc == 2 && !strncmp("-v", argv[1], 3))
1314 die("st-" VERSION ", © 2009 st engineers\n");
1315 else if(argc != 1)
1316 die("usage: st [-v]\n");
1317 setlocale(LC_CTYPE, "");
1318 tnew(80, 24);
1319 ttynew();
1320 xinit();
1321 run();
1322 return 0;
1323 }