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ca5fb5dab34dbc2b5a4082ca7676f2316aff773e
[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 TITLESIZ 256
27 #define ESCSIZ 256
28 #define ESCARGSIZ 16
29 #define MAXDRAWBUF 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 { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4, ATgfx=8 };
42 enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSsave, CSload };
43 enum { CRset=1, CRupdate=2 };
44 enum { TMwrap=1, TMinsert=2 };
45 enum { ESCin=1, ESCcsi=2, ESCosc=4, ESCtitle=8, ESCcharset=16 };
46 enum { SCupdate, SCredraw };
47
48 typedef int Color;
49
50 typedef struct {
51 char c; /* character code */
52 char mode; /* attribute flags */
53 Color fg; /* foreground */
54 Color bg; /* background */
55 char state; /* state flag */
56 } Glyph;
57
58 typedef Glyph* Line;
59
60 typedef struct {
61 Glyph attr; /* current char attributes */
62 char hidden;
63 int x;
64 int y;
65 } TCursor;
66
67 /* CSI Escape sequence structs */
68 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
69 typedef struct {
70 char buf[ESCSIZ]; /* raw string */
71 int len; /* raw string length */
72 char priv;
73 int arg[ESCARGSIZ];
74 int narg; /* nb of args */
75 char mode;
76 } CSIEscape;
77
78 /* Internal representation of the screen */
79 typedef struct {
80 int row; /* nb row */
81 int col; /* nb col */
82 Line* line; /* screen */
83 TCursor c; /* cursor */
84 int top; /* top scroll limit */
85 int bot; /* bottom scroll limit */
86 int mode; /* terminal mode */
87 int esc;
88 char title[TITLESIZ];
89 int titlelen;
90 } Term;
91
92 /* Purely graphic info */
93 typedef struct {
94 Display* dis;
95 Window win;
96 int scr;
97 int w; /* window width */
98 int h; /* window height */
99 int ch; /* char height */
100 int cw; /* char width */
101 } XWindow;
102
103 typedef struct {
104 KeySym k;
105 char s[ESCSIZ];
106 } Key;
107
108 #include "config.h"
109
110 /* Drawing Context */
111 typedef struct {
112 unsigned long col[LEN(colorname)];
113 XFontStruct* font;
114 GC gc;
115 } DC;
116
117 static void die(const char *errstr, ...);
118 static void draw(int);
119 static void execsh(void);
120 static void sigchld(int);
121 static void run(void);
122
123 static void csidump(void);
124 static void csihandle(void);
125 static void csiparse(void);
126 static void csireset(void);
127
128 static void tclearregion(int, int, int, int);
129 static void tcpos(int);
130 static void tcursor(int);
131 static void tdeletechar(int);
132 static void tdeleteline(int);
133 static void tinsertblank(int);
134 static void tinsertblankline(int);
135 static void tmoveto(int, int);
136 static void tnew(int, int);
137 static void tnewline(void);
138 static void tputc(char);
139 static void tputs(char*, int);
140 static void tresize(int, int);
141 static void tscroll(void);
142 static void tsetattr(int*, int);
143 static void tsetchar(char);
144 static void tsetscroll(int, int);
145
146 static void ttynew(void);
147 static void ttyread(void);
148 static void ttyresize(int, int);
149 static void ttywrite(const char *, size_t);
150
151 static unsigned long xgetcol(const char *);
152 static void xclear(int, int, int, int);
153 static void xcursor(int);
154 static void xdrawc(int, int, Glyph);
155 static void xinit(void);
156 static void xscroll(void);
157
158 static void expose(XEvent *);
159 static char * kmap(KeySym);
160 static void kpress(XEvent *);
161 static void resize(XEvent *);
162
163 static void (*handler[LASTEvent])(XEvent *) = {
164 [KeyPress] = kpress,
165 [Expose] = expose,
166 [ConfigureNotify] = resize
167 };
168
169 /* Globals */
170 static DC dc;
171 static XWindow xw;
172 static Term term;
173 static CSIEscape escseq;
174 static int cmdfd;
175 static pid_t pid;
176 static int running;
177
178 #ifdef DEBUG
179 void
180 tdump(void) {
181 int row, col;
182 Glyph c;
183
184 for(row = 0; row < term.row; row++) {
185 for(col = 0; col < term.col; col++) {
186 if(col == term.c.x && row == term.c.y)
187 putchar('#');
188 else {
189 c = term.line[row][col];
190 putchar(c.state & CRset ? c.c : '.');
191 }
192 }
193 putchar('\n');
194 }
195 }
196 #endif
197
198 void
199 die(const char *errstr, ...) {
200 va_list ap;
201
202 va_start(ap, errstr);
203 vfprintf(stderr, errstr, ap);
204 va_end(ap);
205 exit(EXIT_FAILURE);
206 }
207
208 void
209 execsh(void) {
210 char *args[3] = {SHELL, "-i", NULL};
211 putenv("TERM=" TNAME);
212 execvp(SHELL, args);
213 }
214
215 void
216 xbell(void) { /* visual bell */
217 XRectangle r = { 0, 0, xw.w, xw.h };
218 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
219 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
220 /* usleep(30000); */
221 draw(SCredraw);
222 }
223
224 void
225 sigchld(int a) {
226 int stat = 0;
227 if(waitpid(pid, &stat, 0) < 0)
228 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
229 if(WIFEXITED(stat))
230 exit(WEXITSTATUS(stat));
231 else
232 exit(EXIT_FAILURE);
233 }
234
235 void
236 ttynew(void) {
237 int m, s;
238 char *pts;
239
240 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
241 die("openpt failed: %s\n", SERRNO);
242 if(grantpt(m) < 0)
243 die("grandpt failed: %s\n", SERRNO);
244 if(unlockpt(m) < 0)
245 die("unlockpt failed: %s\n", SERRNO);
246 if(!(pts = ptsname(m)))
247 die("ptsname failed: %s\n", SERRNO);
248 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
249 die("Couldn't open slave: %s\n", SERRNO);
250 fcntl(s, F_SETFL, O_NDELAY);
251 switch(pid = fork()) {
252 case -1:
253 die("fork failed\n");
254 break;
255 case 0:
256 setsid(); /* create a new process group */
257 dup2(s, STDIN_FILENO);
258 dup2(s, STDOUT_FILENO);
259 dup2(s, STDERR_FILENO);
260 if(ioctl(s, TIOCSCTTY, NULL) < 0)
261 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
262 execsh();
263 break;
264 default:
265 close(s);
266 cmdfd = m;
267 signal(SIGCHLD, sigchld);
268 }
269 }
270
271 void
272 dump(char c) {
273 static int col;
274 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
275 if(++col % 10 == 0)
276 fprintf(stderr, "\n");
277 }
278
279 void
280 ttyread(void) {
281 char buf[BUFSIZ] = {0};
282 int ret;
283
284 switch(ret = read(cmdfd, buf, BUFSIZ)) {
285 case -1:
286 die("Couldn't read from shell: %s\n", SERRNO);
287 break;
288 default:
289 tputs(buf, ret);
290 }
291 }
292
293 void
294 ttywrite(const char *s, size_t n) {
295 if(write(cmdfd, s, n) == -1)
296 die("write error on tty: %s\n", SERRNO);
297 }
298
299 void
300 ttyresize(int x, int y) {
301 struct winsize w;
302
303 w.ws_row = term.row;
304 w.ws_col = term.col;
305 w.ws_xpixel = w.ws_ypixel = 0;
306 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
307 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
308 }
309
310 void
311 tcpos(int mode) {
312 static int x = 0;
313 static int y = 0;
314
315 if(mode == CSsave)
316 x = term.c.x, y = term.c.y;
317 else if(mode == CSload)
318 tmoveto(x, y);
319 }
320
321 void
322 tnew(int col, int row) { /* screen size */
323 term.row = row, term.col = col;
324 term.top = 0, term.bot = term.row - 1;
325 /* mode */
326 term.mode = TMwrap;
327 /* cursor */
328 term.c.attr.mode = ATnone;
329 term.c.attr.fg = DefaultFG;
330 term.c.attr.bg = DefaultBG;
331 term.c.x = term.c.y = 0;
332 term.c.hidden = 0;
333 /* allocate screen */
334 term.line = calloc(term.row, sizeof(Line));
335 for(row = 0 ; row < term.row; row++)
336 term.line[row] = calloc(term.col, sizeof(Glyph));
337 }
338
339 void
340 tscroll(void) {
341 Line temp = term.line[term.top];
342 int i;
343 /* X stuff _before_ the line swapping (results in wrong line index) */
344 xscroll();
345 for(i = term.top; i < term.bot; i++)
346 term.line[i] = term.line[i+1];
347 memset(temp, 0, sizeof(Glyph) * term.col);
348 term.line[term.bot] = temp;
349 }
350
351 void
352 tnewline(void) {
353 int y = term.c.y + 1;
354 if(y > term.bot)
355 tscroll(), y = term.bot;
356 tmoveto(0, y);
357 }
358
359 void
360 csiparse(void) {
361 /* int noarg = 1; */
362 char *p = escseq.buf;
363
364 escseq.narg = 0;
365 if(*p == '?')
366 escseq.priv = 1, p++;
367
368 while(p < escseq.buf+escseq.len) {
369 while(isdigit(*p)) {
370 escseq.arg[escseq.narg] *= 10;
371 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
372 }
373 if(*p == ';' && escseq.narg+1 < ESCARGSIZ)
374 escseq.narg++, p++;
375 else {
376 escseq.mode = *p;
377 escseq.narg++;
378 return;
379 }
380 }
381 }
382
383 void
384 tmoveto(int x, int y) {
385 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
386 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
387 }
388
389 void
390 tcursor(int dir) {
391 int xf = term.c.x, yf = term.c.y;
392
393 switch(dir) {
394 case CSup:
395 yf--;
396 break;
397 case CSdown:
398 yf++;
399 break;
400 case CSleft:
401 xf--;
402 if(term.mode & TMwrap && xf < 0) {
403 xf = term.col-1, yf--;
404 if(yf < term.top)
405 yf = term.top, xf = 0;
406 }
407 break;
408 case CSright:
409 xf++;
410 if(term.mode & TMwrap && xf >= term.col) {
411 xf = 0, yf++;
412 if(yf > term.bot)
413 yf = term.bot, tscroll();
414 }
415 break;
416 }
417 tmoveto(xf, yf);
418 }
419
420 void
421 tsetchar(char c) {
422 term.line[term.c.y][term.c.x] = term.c.attr;
423 term.line[term.c.y][term.c.x].c = c;
424 term.line[term.c.y][term.c.x].state |= CRset | CRupdate;
425 }
426
427 void
428 tclearregion(int x1, int y1, int x2, int y2) {
429 int x, y;
430
431 LIMIT(x1, 0, term.col-1);
432 LIMIT(x2, 0, term.col-1);
433 LIMIT(y1, 0, term.row-1);
434 LIMIT(y2, 0, term.row-1);
435
436 /* XXX: could be optimized */
437 for(x = x1; x <= x2; x++)
438 for(y = y1; y <= y2; y++)
439 memset(&term.line[y][x], 0, sizeof(Glyph));
440
441 xclear(x1, y1, x2, y2);
442 }
443
444 void
445 tdeletechar(int n) {
446 int src = term.c.x + n;
447 int dst = term.c.x;
448 int size = term.col - src;
449
450 if(src >= term.col) {
451 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
452 return;
453 }
454 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
455 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
456 }
457
458 void
459 tinsertblank(int n) {
460 int src = term.c.x;
461 int dst = src + n;
462 int size = term.col - n - src;
463
464 if(dst >= term.col) {
465 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
466 return;
467 }
468 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
469 tclearregion(src, term.c.y, dst, term.c.y);
470 }
471
472 void
473 tsetlinestate(int n, int state) {
474 int i;
475 for(i = 0; i < term.col; i++)
476 term.line[n][i].state |= state;
477 }
478
479 void
480 tinsertblankline (int n) {
481 int i;
482 Line blank;
483 int bot = term.bot;
484
485 if(term.c.y > term.bot)
486 bot = term.row - 1;
487 else if(term.c.y < term.top)
488 bot = term.top - 1;
489 if(term.c.y + n >= bot) {
490 tclearregion(0, term.c.y, term.col-1, bot);
491 return;
492 }
493 for(i = bot; i >= term.c.y+n; i--) {
494 /* swap deleted line <-> blanked line */
495 blank = term.line[i];
496 term.line[i] = term.line[i-n];
497 term.line[i-n] = blank;
498 /* blank it */
499 memset(blank, 0, term.col * sizeof(Glyph));
500 tsetlinestate(i, CRupdate);
501 tsetlinestate(i-n, CRupdate);
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 tsetlinestate(i, CRupdate);
527 tsetlinestate(i-n, CRupdate);
528 }
529 }
530
531 void
532 tsetattr(int *attr, int l) {
533 int i;
534
535 for(i = 0; i < l; i++) {
536 switch(attr[i]) {
537 case 0:
538 term.c.attr.mode &= ~(ATreverse | ATunderline | ATbold);
539 term.c.attr.fg = DefaultFG;
540 term.c.attr.bg = DefaultBG;
541 break;
542 case 1:
543 term.c.attr.mode |= ATbold;
544 break;
545 case 4:
546 term.c.attr.mode |= ATunderline;
547 break;
548 case 7:
549 term.c.attr.mode |= ATreverse;
550 break;
551 case 8:
552 term.c.hidden = CShide;
553 break;
554 case 22:
555 term.c.attr.mode &= ~ATbold;
556 break;
557 case 24:
558 term.c.attr.mode &= ~ATunderline;
559 break;
560 case 27:
561 term.c.attr.mode &= ~ATreverse;
562 break;
563 case 39:
564 term.c.attr.fg = DefaultFG;
565 break;
566 case 49:
567 term.c.attr.fg = DefaultBG;
568 break;
569 default:
570 if(BETWEEN(attr[i], 30, 37))
571 term.c.attr.fg = attr[i] - 30;
572 else if(BETWEEN(attr[i], 40, 47))
573 term.c.attr.bg = attr[i] - 40;
574 break;
575 }
576 }
577 }
578
579 void
580 tsetscroll(int t, int b) {
581 int temp;
582
583 LIMIT(t, 0, term.row-1);
584 LIMIT(b, 0, term.row-1);
585 if(t > b) {
586 temp = t;
587 t = b;
588 b = temp;
589 }
590 term.top = t;
591 term.bot = b;
592 }
593
594 void
595 csihandle(void) {
596 if(escseq.priv)
597 csidump();
598 switch(escseq.mode) {
599 unknown:
600 default:
601 fprintf(stderr, "erresc: unknown sequence\n");
602 csidump();
603 /* die(""); */
604 break;
605 case '@': /* Insert <n> blank char */
606 DEFAULT(escseq.arg[0], 1);
607 tinsertblank(escseq.arg[0]);
608 break;
609 case 'A': /* Cursor <n> Up */
610 case 'e':
611 DEFAULT(escseq.arg[0], 1);
612 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
613 break;
614 case 'B': /* Cursor <n> Down */
615 DEFAULT(escseq.arg[0], 1);
616 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
617 break;
618 case 'C': /* Cursor <n> Forward */
619 case 'a':
620 DEFAULT(escseq.arg[0], 1);
621 tmoveto(term.c.x+escseq.arg[0], term.c.y);
622 break;
623 case 'D': /* Cursor <n> Backward */
624 DEFAULT(escseq.arg[0], 1);
625 tmoveto(term.c.x-escseq.arg[0], term.c.y);
626 break;
627 case 'E': /* Cursor <n> Down and first col */
628 DEFAULT(escseq.arg[0], 1);
629 tmoveto(0, term.c.y+escseq.arg[0]);
630 break;
631 case 'F': /* Cursor <n> Up and first col */
632 DEFAULT(escseq.arg[0], 1);
633 tmoveto(0, term.c.y-escseq.arg[0]);
634 break;
635 case 'G': /* Move to <col> */
636 case '`':
637 DEFAULT(escseq.arg[0], 1);
638 tmoveto(escseq.arg[0]-1, term.c.y);
639 break;
640 case 'H': /* Move to <row> <col> */
641 case 'f':
642 DEFAULT(escseq.arg[0], 1);
643 DEFAULT(escseq.arg[1], 1);
644 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
645 break;
646 case 'J': /* Clear screen */
647 switch(escseq.arg[0]) {
648 case 0: /* below */
649 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
650 break;
651 case 1: /* above */
652 tclearregion(0, 0, term.c.x, term.c.y);
653 break;
654 case 2: /* all */
655 tclearregion(0, 0, term.col-1, term.row-1);
656 break;
657 }
658 break;
659 case 'K': /* Clear line */
660 switch(escseq.arg[0]) {
661 case 0: /* right */
662 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
663 break;
664 case 1: /* left */
665 tclearregion(0, term.c.y, term.c.x, term.c.y);
666 break;
667 case 2: /* all */
668 tclearregion(0, term.c.y, term.col-1, term.c.y);
669 break;
670 }
671 break;
672 case 'S':
673 case 'L': /* Insert <n> blank lines */
674 DEFAULT(escseq.arg[0], 1);
675 tinsertblankline(escseq.arg[0]);
676 break;
677 case 'l':
678 if(escseq.priv) {
679 switch(escseq.arg[0]) {
680 case 7:
681 term.mode &= ~TMwrap;
682 break;
683 case 25:
684 term.c.hidden = 1;
685 break;
686 }
687 }
688 break;
689 case 'M': /* Delete <n> lines */
690 DEFAULT(escseq.arg[0], 1);
691 tdeleteline(escseq.arg[0]);
692 break;
693 case 'X':
694 case 'P': /* Delete <n> char */
695 DEFAULT(escseq.arg[0], 1);
696 tdeletechar(escseq.arg[0]);
697 break;
698 case 'd': /* Move to <row> */
699 DEFAULT(escseq.arg[0], 1);
700 tmoveto(term.c.x, escseq.arg[0]-1);
701 break;
702 case 'h': /* Set terminal mode */
703 if(escseq.priv)
704 switch(escseq.arg[0]) {
705 case 7:
706 term.mode |= TMwrap;
707 break;
708 case 25:
709 term.c.hidden = 0;
710 break;
711 case 1034:
712 /* XXX: Interpret "meta" key, sets eighth bit. */
713 break;
714 }
715 break;
716 case 'm': /* Terminal attribute (color) */
717 tsetattr(escseq.arg, escseq.narg);
718 break;
719 case 'r':
720 if(escseq.priv)
721 goto unknown;
722 else {
723 DEFAULT(escseq.arg[0], 1);
724 DEFAULT(escseq.arg[1], term.row);
725 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
726 }
727 break;
728 case 's': /* Save cursor position */
729 tcpos(CSsave);
730 break;
731 case 'u': /* Load cursor position */
732 tcpos(CSload);
733 break;
734 }
735 }
736
737 void
738 csidump(void) {
739 int i;
740 printf("ESC [ %s", escseq.priv ? "? " : "");
741 if(escseq.narg)
742 for(i = 0; i < escseq.narg; i++)
743 printf("%d ", escseq.arg[i]);
744 if(escseq.mode)
745 putchar(escseq.mode);
746 putchar('\n');
747 }
748
749 void
750 csireset(void) {
751 memset(&escseq, 0, sizeof(escseq));
752 }
753
754 void
755 tputtab(void) {
756 int space = TAB - term.c.x % TAB;
757
758 if(term.c.x + space >= term.col)
759 space--;
760
761 for(; space > 0; space--)
762 tcursor(CSright);
763 }
764
765 void
766 tputc(char c) {
767 #if 0
768 dump(c);
769 #endif
770 if(term.esc & ESCin) {
771 if(term.esc & ESCcsi) {
772 escseq.buf[escseq.len++] = c;
773 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESCSIZ) {
774 term.esc = 0;
775 csiparse(), csihandle();
776 }
777 } else if (term.esc & ESCosc) {
778 if(c == ';') {
779 term.titlelen = 0;
780 term.esc = ESCin | ESCtitle;
781 }
782 } else if(term.esc & ESCtitle) {
783 if(c == '\a' || term.titlelen+1 >= TITLESIZ) {
784 term.esc = 0;
785 term.title[term.titlelen] = '\0';
786 XStoreName(xw.dis, xw.win, term.title);
787 } else {
788 term.title[term.titlelen++] = c;
789 }
790 } else if(term.esc & ESCcharset) {
791 printf("ESC ( %c\n", c);
792 switch(c) {
793 case '0': /* Line drawing crap */
794 term.c.attr.mode |= ATgfx;
795 break;
796 case 'B': /* Back to regular text */
797 term.c.attr.mode &= ~ATgfx;
798 break;
799 }
800 term.esc = 0;
801 } else {
802 switch(c) {
803 case '[':
804 term.esc |= ESCcsi;
805 break;
806 case ']':
807 term.esc |= ESCosc;
808 break;
809 case '(':
810 term.esc |= ESCcharset;
811 break;
812 case 'A':
813 tmoveto(term.c.x, term.c.y-1);
814 break;
815 case 'B':
816 tmoveto(term.c.x, term.c.y+1);
817 break;
818 case 'C':
819 tmoveto(term.c.x+1, term.c.y);
820 break;
821 case 'D':
822 tmoveto(term.c.x-1, term.c.y);
823 break;
824 default:
825 fprintf(stderr, "erresc: unknown sequence ESC %02X '%c'\n", c, isprint(c)?c:'.');
826 }
827 }
828 } else {
829 switch(c) {
830 case '\t':
831 tputtab();
832 break;
833 case '\b':
834 tcursor(CSleft);
835 break;
836 case '\r':
837 tmoveto(0, term.c.y);
838 break;
839 case '\n':
840 tnewline();
841 break;
842 case '\a':
843 xbell();
844 break;
845 case '\033':
846 csireset();
847 term.esc = ESCin;
848 break;
849 default:
850 tsetchar(c);
851 tcursor(CSright);
852 break;
853 }
854 }
855 }
856
857 void
858 tputs(char *s, int len) {
859 for(; len > 0; len--)
860 tputc(*s++);
861 }
862
863 void
864 tresize(int col, int row) {
865 int i;
866 Line *line;
867 int minrow = MIN(row, term.row);
868 int mincol = MIN(col, term.col);
869
870 if(col < 1 || row < 1)
871 return;
872 /* alloc */
873 line = calloc(row, sizeof(Line));
874 for(i = 0 ; i < row; i++)
875 line[i] = calloc(col, sizeof(Glyph));
876 /* copy */
877 for(i = 0 ; i < minrow; i++)
878 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
879 /* free */
880 for(i = 0; i < term.row; i++)
881 free(term.line[i]);
882 free(term.line);
883
884 LIMIT(term.c.x, 0, col-1);
885 LIMIT(term.c.y, 0, row-1);
886 LIMIT(term.top, 0, row-1);
887 LIMIT(term.bot, 0, row-1);
888
889 term.bot = row-1;
890 term.line = line;
891 term.col = col, term.row = row;
892 }
893
894 unsigned long
895 xgetcol(const char *s) {
896 XColor color;
897 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
898
899 if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
900 color.pixel = WhitePixel(xw.dis, xw.scr);
901 fprintf(stderr, "Could not allocate color '%s'\n", s);
902 }
903 return color.pixel;
904 }
905
906 void
907 xclear(int x1, int y1, int x2, int y2) {
908 XClearArea(xw.dis, xw.win,
909 x1 * xw.cw, y1 * xw.ch,
910 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch,
911 False);
912 }
913
914 void
915 xscroll(void) {
916 int srcy = (term.top+1) * xw.ch;
917 int dsty = term.top * xw.ch;
918 int height = (term.bot-term.top) * xw.ch;
919
920 xcursor(CShide);
921 XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
922 xclear(0, term.bot, term.col-1, term.bot);
923 }
924
925 void
926 xinit(void) {
927 XGCValues values;
928 unsigned long valuemask;
929 XClassHint chint;
930 XWMHints wmhint;
931 XSizeHints shint;
932 char *args[] = {NULL};
933 int i;
934
935 xw.dis = XOpenDisplay(NULL);
936 xw.scr = XDefaultScreen(xw.dis);
937 if(!xw.dis)
938 die("Can't open display\n");
939
940 /* font */
941 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
942 die("Can't load font %s\n", FONT);
943
944 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
945 xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
946
947 /* colors */
948 for(i = 0; i < LEN(colorname); i++)
949 dc.col[i] = xgetcol(colorname[i]);
950
951 term.c.attr.fg = DefaultFG;
952 term.c.attr.bg = DefaultBG;
953 term.c.attr.mode = ATnone;
954 /* windows */
955 xw.h = term.row * xw.ch;
956 xw.w = term.col * xw.cw;
957 /* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
958 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
959 xw.w, xw.h, BORDER,
960 dc.col[DefaultBG],
961 dc.col[DefaultBG]);
962 /* gc */
963 values.foreground = XWhitePixel(xw.dis, xw.scr);
964 values.font = dc.font->fid;
965 valuemask = GCForeground | GCFont;
966 dc.gc = XCreateGC(xw.dis, xw.win, valuemask, &values);
967 XMapWindow(xw.dis, xw.win);
968 /* wm stuff */
969 chint.res_name = TNAME, chint.res_class = TNAME;
970 wmhint.input = 1, wmhint.flags = InputHint;
971 shint.height_inc = xw.ch, shint.width_inc = xw.cw;
972 shint.height = xw.h, shint.width = xw.w;
973 shint.flags = PSize | PResizeInc;
974 XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
975 XStoreName(xw.dis, xw.win, TNAME);
976 XSync(xw.dis, 0);
977 }
978
979 void
980 xdraws (char *s, Glyph base, int x, int y, int len) {
981 unsigned long xfg, xbg;
982 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
983 int i;
984
985 if(base.mode & ATreverse)
986 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
987 else
988 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
989
990 XSetBackground(xw.dis, dc.gc, xbg);
991 XSetForeground(xw.dis, dc.gc, xfg);
992
993 if(base.mode & ATgfx) {
994
995 for(i = 0; i < len; i++)
996 s[i] = gfx[s[i]];
997 }
998
999 XDrawImageString(xw.dis, xw.win, dc.gc, winx, winy, s, len);
1000
1001 if(base.mode & ATunderline)
1002 XDrawLine(xw.dis, xw.win, dc.gc, winx, winy+1, winx+width-1, winy+1);
1003 }
1004
1005 void
1006 xdrawc(int x, int y, Glyph g) {
1007 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1008 unsigned long xfg, xbg;
1009
1010 /* reverse video */
1011 if(g.mode & ATreverse)
1012 xfg = dc.col[g.bg], xbg = dc.col[g.fg];
1013 else
1014 xfg = dc.col[g.fg], xbg = dc.col[g.bg];
1015 /* background */
1016 XSetBackground(xw.dis, dc.gc, xbg);
1017 XSetForeground(xw.dis, dc.gc, xfg);
1018 XDrawImageString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1019 }
1020
1021 void
1022 xcursor(int mode) {
1023 static int oldx = 0;
1024 static int oldy = 0;
1025 Glyph g = {' ', ATnone, DefaultBG, DefaultCS, 0};
1026
1027 LIMIT(oldx, 0, term.col-1);
1028 LIMIT(oldy, 0, term.row-1);
1029
1030 if(term.line[term.c.y][term.c.x].state & CRset)
1031 g.c = term.line[term.c.y][term.c.x].c;
1032 /* remove the old cursor */
1033 if(term.line[oldy][oldx].state & CRset)
1034 xdrawc(oldx, oldy, term.line[oldy][oldx]);
1035 else
1036 xclear(oldx, oldy, oldx, oldy);
1037 /* draw the new one */
1038 if(mode == CSdraw) {
1039 xdrawc(term.c.x, term.c.y, g);
1040 oldx = term.c.x, oldy = term.c.y;
1041 }
1042 }
1043
1044 void
1045 draw(int redraw_all) {
1046 int i, x, y, ox;
1047 Glyph base, new;
1048 char buf[MAXDRAWBUF];
1049
1050 for(y = 0; y < term.row; y++) {
1051 base = term.line[y][0];
1052 i = ox = 0;
1053 for(x = 0; x < term.col; x++) {
1054 new = term.line[y][x];
1055 if(!ATTRCMP(base, new) && i < MAXDRAWBUF)
1056 buf[i++] = new.c;
1057 else {
1058 xdraws(buf, base, ox, y, i);
1059 buf[0] = new.c;
1060 i = 1;
1061 ox = x;
1062 base = new;
1063 }
1064 }
1065 xdraws(buf, base, ox, y, i);
1066 }
1067 if(!term.c.hidden)
1068 xcursor(CSdraw);
1069 }
1070
1071 void
1072 expose(XEvent *ev) {
1073 draw(SCredraw);
1074 }
1075
1076 char*
1077 kmap(KeySym k) {
1078 int i;
1079 for(i = 0; i < LEN(key); i++)
1080 if(key[i].k == k)
1081 return (char*)key[i].s;
1082 return NULL;
1083 }
1084
1085 void
1086 kpress(XEvent *ev) {
1087 XKeyEvent *e = &ev->xkey;
1088 KeySym ksym;
1089 char buf[32];
1090 char *customkey;
1091 int len;
1092 int meta;
1093 int shift;
1094
1095 meta = e->state & Mod1Mask;
1096 shift = e->state & ShiftMask;
1097 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1098
1099 if(customkey = kmap(ksym))
1100 ttywrite(customkey, strlen(customkey));
1101 else if(len > 0) {
1102 buf[sizeof(buf)-1] = '\0';
1103 if(meta && len == 1)
1104 ttywrite("\033", 1);
1105 ttywrite(buf, len);
1106 } else
1107 switch(ksym) {
1108 case XK_Insert:
1109 if(shift)
1110 /* XXX: paste X clipboard */;
1111 break;
1112 default:
1113 fprintf(stderr, "errkey: %d\n", (int)ksym);
1114 break;
1115 }
1116 }
1117
1118 void
1119 resize(XEvent *e) {
1120 int col, row;
1121 col = e->xconfigure.width / xw.cw;
1122 row = e->xconfigure.height / xw.ch;
1123
1124 if(term.col != col || term.row != row) {
1125 tresize(col, row);
1126 ttyresize(col, row);
1127 xw.w = e->xconfigure.width;
1128 xw.h = e->xconfigure.height;
1129 draw(SCredraw);
1130 }
1131 }
1132
1133 void
1134 run(void) {
1135 XEvent ev;
1136 fd_set rfd;
1137 int xfd = XConnectionNumber(xw.dis);
1138
1139 running = 1;
1140 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1141 XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
1142
1143 while(running) {
1144 FD_ZERO(&rfd);
1145 FD_SET(cmdfd, &rfd);
1146 FD_SET(xfd, &rfd);
1147 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1148 if(errno == EINTR)
1149 continue;
1150 die("select failed: %s\n", SERRNO);
1151 }
1152 if(FD_ISSET(cmdfd, &rfd)) {
1153 ttyread();
1154 draw(SCupdate);
1155 }
1156 while(XPending(xw.dis)) {
1157 XNextEvent(xw.dis, &ev);
1158 if(handler[ev.type])
1159 (handler[ev.type])(&ev);
1160 }
1161 }
1162 }
1163
1164 int
1165 main(int argc, char *argv[]) {
1166 if(argc == 2 && !strncmp("-v", argv[1], 3))
1167 die("st-" VERSION ", © 2009 st engineers\n");
1168 else if(argc != 1)
1169 die("usage: st [-v]\n");
1170 setlocale(LC_CTYPE, "");
1171 tnew(80, 24);
1172 ttynew();
1173 xinit();
1174 run();
1175 return 0;
1176 }