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6a6ea751de789f2a4ee3ac40749b9d38cc25bfb4
[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/Xatom.h>
20 #include <X11/Xlib.h>
21 #include <X11/Xutil.h>
22 #include <X11/cursorfont.h>
23 #include <X11/keysym.h>
24
25 #include <sys/time.h>
26 #include <time.h>
27
28 #if defined(__linux)
29 #include <pty.h>
30 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
31 #include <util.h>
32 #elif defined(__FreeBSD__) || defined(__DragonFly__)
33 #include <libutil.h>
34 #endif
35
36 #define USAGE \
37 "st-" VERSION ", (c) 2010 st engineers\n" \
38 "usage: st [-t title] [-c class] [-v] [-e cmd]\n"
39
40 /* Arbitrary sizes */
41 #define ESC_TITLE_SIZ 256
42 #define ESC_BUF_SIZ 256
43 #define ESC_ARG_SIZ 16
44 #define DRAW_BUF_SIZ 1024
45 #define UTF_SIZ 4
46
47 #define SERRNO strerror(errno)
48 #define MIN(a, b) ((a) < (b) ? (a) : (b))
49 #define MAX(a, b) ((a) < (b) ? (b) : (a))
50 #define LEN(a) (sizeof(a) / sizeof(a[0]))
51 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
52 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
53 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
54 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
55 #define IS_SET(flag) (term.mode & (flag))
56 #define TIMEDIFFERENCE(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
57
58 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
59 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
60 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
61 CURSOR_SAVE, CURSOR_LOAD };
62 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
63 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
64 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
65 MODE_CRLF=16 };
66 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
67 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
68
69 #undef B0
70 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
71
72 typedef struct {
73 char c[UTF_SIZ]; /* character code */
74 char mode; /* attribute flags */
75 int fg; /* foreground */
76 int bg; /* background */
77 char state; /* state flags */
78 } Glyph;
79
80 typedef Glyph* Line;
81
82 typedef struct {
83 Glyph attr; /* current char attributes */
84 int x;
85 int y;
86 char state;
87 } TCursor;
88
89 /* CSI Escape sequence structs */
90 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
91 typedef struct {
92 char buf[ESC_BUF_SIZ]; /* raw string */
93 int len; /* raw string length */
94 char priv;
95 int arg[ESC_ARG_SIZ];
96 int narg; /* nb of args */
97 char mode;
98 } CSIEscape;
99
100 /* Internal representation of the screen */
101 typedef struct {
102 int row; /* nb row */
103 int col; /* nb col */
104 Line* line; /* screen */
105 Line* alt; /* alternate screen */
106 TCursor c; /* cursor */
107 int top; /* top scroll limit */
108 int bot; /* bottom scroll limit */
109 int mode; /* terminal mode flags */
110 int esc; /* escape state flags */
111 char title[ESC_TITLE_SIZ];
112 int titlelen;
113 } Term;
114
115 /* Purely graphic info */
116 typedef struct {
117 Display* dpy;
118 Colormap cmap;
119 Window win;
120 Pixmap buf;
121 XIM xim;
122 XIC xic;
123 int scr;
124 int w; /* window width */
125 int h; /* window height */
126 int bufw; /* pixmap width */
127 int bufh; /* pixmap height */
128 int ch; /* char height */
129 int cw; /* char width */
130 char state; /* focus, redraw, visible */
131 } XWindow;
132
133 typedef struct {
134 KeySym k;
135 unsigned int mask;
136 char s[ESC_BUF_SIZ];
137 } Key;
138
139 /* Drawing Context */
140 typedef struct {
141 unsigned long col[256];
142 GC gc;
143 struct {
144 int ascent;
145 int descent;
146 short lbearing;
147 short rbearing;
148 XFontSet set;
149 } font, bfont;
150 } DC;
151
152 /* TODO: use better name for vars... */
153 typedef struct {
154 int mode;
155 int bx, by;
156 int ex, ey;
157 struct {int x, y;} b, e;
158 char *clip;
159 Atom xtarget;
160 struct timeval tclick1;
161 struct timeval tclick2;
162 } Selection;
163
164 #include "config.h"
165
166 static void die(const char*, ...);
167 static void draw(void);
168 static void drawregion(int, int, int, int);
169 static void execsh(void);
170 static void sigchld(int);
171 static void run(void);
172
173 static void csidump(void);
174 static void csihandle(void);
175 static void csiparse(void);
176 static void csireset(void);
177
178 static void tclearregion(int, int, int, int);
179 static void tcursor(int);
180 static void tdeletechar(int);
181 static void tdeleteline(int);
182 static void tinsertblank(int);
183 static void tinsertblankline(int);
184 static void tmoveto(int, int);
185 static void tnew(int, int);
186 static void tnewline(int);
187 static void tputtab(void);
188 static void tputc(char*);
189 static void treset(void);
190 static int tresize(int, int);
191 static void tscrollup(int, int);
192 static void tscrolldown(int, int);
193 static void tsetattr(int*, int);
194 static void tsetchar(char*);
195 static void tsetscroll(int, int);
196 static void tswapscreen(void);
197
198 static void ttynew(void);
199 static void ttyread(void);
200 static void ttyresize(int, int);
201 static void ttywrite(const char *, size_t);
202
203 static void xdraws(char *, Glyph, int, int, int, int);
204 static void xhints(void);
205 static void xclear(int, int, int, int);
206 static void xdrawcursor(void);
207 static void xinit(void);
208 static void xloadcols(void);
209 static void xseturgency(int);
210 static void xsetsel(char*);
211 static void xresize(int, int);
212
213 static void expose(XEvent *);
214 static void visibility(XEvent *);
215 static void unmap(XEvent *);
216 static char* kmap(KeySym, unsigned int state);
217 static void kpress(XEvent *);
218 static void resize(XEvent *);
219 static void focus(XEvent *);
220 static void brelease(XEvent *);
221 static void bpress(XEvent *);
222 static void bmotion(XEvent *);
223 static void selnotify(XEvent *);
224 static void selrequest(XEvent *);
225
226 static void selinit(void);
227 static inline int selected(int, int);
228 static void selcopy(void);
229 static void selpaste();
230
231 static int utf8decode(char *, long *);
232 static int utf8encode(long *, char *);
233 static int utf8size(char *);
234 static int isfullutf8(char *, int);
235
236 static void (*handler[LASTEvent])(XEvent *) = {
237 [KeyPress] = kpress,
238 [ConfigureNotify] = resize,
239 [VisibilityNotify] = visibility,
240 [UnmapNotify] = unmap,
241 [Expose] = expose,
242 [FocusIn] = focus,
243 [FocusOut] = focus,
244 [MotionNotify] = bmotion,
245 [ButtonPress] = bpress,
246 [ButtonRelease] = brelease,
247 [SelectionNotify] = selnotify,
248 [SelectionRequest] = selrequest,
249 };
250
251 /* Globals */
252 static DC dc;
253 static XWindow xw;
254 static Term term;
255 static CSIEscape escseq;
256 static int cmdfd;
257 static pid_t pid;
258 static Selection sel;
259 static char **opt_cmd = NULL;
260 static char *opt_title = NULL;
261 static char *opt_class = NULL;
262
263 int
264 utf8decode(char *s, long *u) {
265 unsigned char c;
266 int i, n, rtn;
267
268 rtn = 1;
269 c = *s;
270 if(~c&B7) { /* 0xxxxxxx */
271 *u = c;
272 return rtn;
273 } else if((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
274 *u = c&(B4|B3|B2|B1|B0);
275 n = 1;
276 } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
277 *u = c&(B3|B2|B1|B0);
278 n = 2;
279 } else if((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
280 *u = c&(B2|B1|B0);
281 n = 3;
282 } else
283 goto invalid;
284 for(i=n,++s; i>0; --i,++rtn,++s) {
285 c = *s;
286 if((c&(B7|B6)) != B7) /* 10xxxxxx */
287 goto invalid;
288 *u <<= 6;
289 *u |= c&(B5|B4|B3|B2|B1|B0);
290 }
291 if((n == 1 && *u < 0x80) ||
292 (n == 2 && *u < 0x800) ||
293 (n == 3 && *u < 0x10000) ||
294 (*u >= 0xD800 && *u <= 0xDFFF))
295 goto invalid;
296 return rtn;
297 invalid:
298 *u = 0xFFFD;
299 return rtn;
300 }
301
302 int
303 utf8encode(long *u, char *s) {
304 unsigned char *sp;
305 unsigned long uc;
306 int i, n;
307
308 sp = (unsigned char*) s;
309 uc = *u;
310 if(uc < 0x80) {
311 *sp = uc; /* 0xxxxxxx */
312 return 1;
313 } else if(*u < 0x800) {
314 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
315 n = 1;
316 } else if(uc < 0x10000) {
317 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
318 n = 2;
319 } else if(uc <= 0x10FFFF) {
320 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
321 n = 3;
322 } else {
323 goto invalid;
324 }
325 for(i=n,++sp; i>0; --i,++sp)
326 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
327 return n+1;
328 invalid:
329 /* U+FFFD */
330 *s++ = '\xEF';
331 *s++ = '\xBF';
332 *s = '\xBD';
333 return 3;
334 }
335
336 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
337 UTF-8 otherwise return 0 */
338 int
339 isfullutf8(char *s, int b) {
340 unsigned char *c1, *c2, *c3;
341
342 c1 = (unsigned char *) s;
343 c2 = (unsigned char *) ++s;
344 c3 = (unsigned char *) ++s;
345 if(b < 1)
346 return 0;
347 else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
348 return 0;
349 else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
350 ((b == 1) ||
351 ((b == 2) && (*c2&(B7|B6)) == B7)))
352 return 0;
353 else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
354 ((b == 1) ||
355 ((b == 2) && (*c2&(B7|B6)) == B7) ||
356 ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
357 return 0;
358 else
359 return 1;
360 }
361
362 int
363 utf8size(char *s) {
364 unsigned char c = *s;
365
366 if(~c&B7)
367 return 1;
368 else if((c&(B7|B6|B5)) == (B7|B6))
369 return 2;
370 else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
371 return 3;
372 else
373 return 4;
374 }
375
376 void
377 selinit(void) {
378 sel.tclick1.tv_sec = 0;
379 sel.tclick1.tv_usec = 0;
380 sel.mode = 0;
381 sel.bx = -1;
382 sel.clip = NULL;
383 sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
384 if(sel.xtarget == None)
385 sel.xtarget = XA_STRING;
386 }
387
388 static inline int
389 selected(int x, int y) {
390 if(sel.ey == y && sel.by == y) {
391 int bx = MIN(sel.bx, sel.ex);
392 int ex = MAX(sel.bx, sel.ex);
393 return BETWEEN(x, bx, ex);
394 }
395 return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
396 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
397 }
398
399 void
400 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
401 if(b)
402 *b = e->xbutton.button;
403
404 *x = (e->xbutton.x - BORDER)/xw.cw;
405 *y = (e->xbutton.y - BORDER)/xw.ch;
406 sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
407 sel.b.y = MIN(sel.by, sel.ey);
408 sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
409 sel.e.y = MAX(sel.by, sel.ey);
410 }
411
412 void
413 bpress(XEvent *e) {
414 sel.mode = 1;
415 sel.ex = sel.bx = (e->xbutton.x - BORDER)/xw.cw;
416 sel.ey = sel.by = (e->xbutton.y - BORDER)/xw.ch;
417 }
418
419 void
420 selcopy(void) {
421 char *str, *ptr;
422 int x, y, sz, sl, ls = 0;
423
424 if(sel.bx == -1)
425 str = NULL;
426 else {
427 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
428 ptr = str = malloc(sz);
429 for(y = 0; y < term.row; y++) {
430 for(x = 0; x < term.col; x++)
431 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
432 sl = utf8size(term.line[y][x].c);
433 memcpy(ptr, term.line[y][x].c, sl);
434 ptr += sl;
435 }
436 if(ls && y < sel.e.y)
437 *ptr++ = '\n';
438 }
439 *ptr = 0;
440 }
441 xsetsel(str);
442 }
443
444 void
445 selnotify(XEvent *e) {
446 unsigned long nitems;
447 unsigned long ofs, rem;
448 int format;
449 unsigned char *data;
450 Atom type;
451
452 ofs = 0;
453 do {
454 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
455 False, AnyPropertyType, &type, &format,
456 &nitems, &rem, &data)) {
457 fprintf(stderr, "Clipboard allocation failed\n");
458 return;
459 }
460 ttywrite((const char *) data, nitems * format / 8);
461 XFree(data);
462 /* number of 32-bit chunks returned */
463 ofs += nitems * format / 32;
464 } while(rem > 0);
465 }
466
467 void
468 selpaste() {
469 XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
470 }
471
472 void
473 selrequest(XEvent *e) {
474 XSelectionRequestEvent *xsre;
475 XSelectionEvent xev;
476 Atom xa_targets;
477
478 xsre = (XSelectionRequestEvent *) e;
479 xev.type = SelectionNotify;
480 xev.requestor = xsre->requestor;
481 xev.selection = xsre->selection;
482 xev.target = xsre->target;
483 xev.time = xsre->time;
484 /* reject */
485 xev.property = None;
486
487 xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
488 if(xsre->target == xa_targets) {
489 /* respond with the supported type */
490 Atom string = sel.xtarget;
491 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
492 XA_ATOM, 32, PropModeReplace,
493 (unsigned char *) &string, 1);
494 xev.property = xsre->property;
495 } else if(xsre->target == sel.xtarget) {
496 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
497 xsre->target, 8, PropModeReplace,
498 (unsigned char *) sel.clip, strlen(sel.clip));
499 xev.property = xsre->property;
500 }
501
502 /* all done, send a notification to the listener */
503 if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
504 fprintf(stderr, "Error sending SelectionNotify event\n");
505 }
506
507 void
508 xsetsel(char *str) {
509 /* register the selection for both the clipboard and the primary */
510 Atom clipboard;
511
512 free(sel.clip);
513 sel.clip = str;
514
515 XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
516
517 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
518 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
519
520 XFlush(xw.dpy);
521 }
522
523 void
524 brelease(XEvent *e) {
525 int b;
526
527 sel.mode = 0;
528 getbuttoninfo(e, &b, &sel.ex, &sel.ey);
529 if(sel.bx == sel.ex && sel.by == sel.ey) {
530 sel.bx = -1;
531 if(b == 2)
532 selpaste();
533 else if(b == 1) {
534 struct timeval now;
535 gettimeofday(&now, NULL);
536
537 if(TIMEDIFFERENCE(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
538 /* triple click on the line */
539 sel.b.x = sel.bx = 0;
540 sel.e.x = sel.ex = term.col;
541 sel.b.y = sel.e.y = sel.ey;
542 selcopy();
543 } else if(TIMEDIFFERENCE(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
544 /* double click to select word */
545 sel.bx = sel.ex;
546 while(term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
547 term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
548 sel.b.x = sel.bx;
549 while(term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
550 term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
551 sel.e.x = sel.ex;
552 sel.b.y = sel.e.y = sel.ey;
553 selcopy();
554 }
555 }
556 } else if(b == 1)
557 selcopy();
558 memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
559 gettimeofday(&sel.tclick1, NULL);
560 draw();
561 }
562
563 void
564 bmotion(XEvent *e) {
565 if(sel.mode) {
566 int oldey = sel.ey,
567 oldex = sel.ex;
568 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
569
570 if(oldey != sel.ey || oldex != sel.ex) {
571 int starty = MIN(oldey, sel.ey);
572 int endy = MAX(oldey, sel.ey);
573 drawregion(0, (starty > 0 ? starty : 0), term.col, (sel.ey < term.row ? endy+1 : term.row));
574 }
575 }
576 }
577
578 void
579 die(const char *errstr, ...) {
580 va_list ap;
581
582 va_start(ap, errstr);
583 vfprintf(stderr, errstr, ap);
584 va_end(ap);
585 exit(EXIT_FAILURE);
586 }
587
588 void
589 execsh(void) {
590 char **args;
591 char *envshell = getenv("SHELL");
592
593 DEFAULT(envshell, "sh");
594 putenv("TERM="TNAME);
595 args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
596 execvp(args[0], args);
597 exit(EXIT_FAILURE);
598 }
599
600 void
601 sigchld(int a) {
602 int stat = 0;
603 if(waitpid(pid, &stat, 0) < 0)
604 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
605 if(WIFEXITED(stat))
606 exit(WEXITSTATUS(stat));
607 else
608 exit(EXIT_FAILURE);
609 }
610
611 void
612 ttynew(void) {
613 int m, s;
614
615 /* seems to work fine on linux, openbsd and freebsd */
616 struct winsize w = {term.row, term.col, 0, 0};
617 if(openpty(&m, &s, NULL, NULL, &w) < 0)
618 die("openpty failed: %s\n", SERRNO);
619
620 switch(pid = fork()) {
621 case -1:
622 die("fork failed\n");
623 break;
624 case 0:
625 setsid(); /* create a new process group */
626 dup2(s, STDIN_FILENO);
627 dup2(s, STDOUT_FILENO);
628 dup2(s, STDERR_FILENO);
629 if(ioctl(s, TIOCSCTTY, NULL) < 0)
630 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
631 close(s);
632 close(m);
633 execsh();
634 break;
635 default:
636 close(s);
637 cmdfd = m;
638 signal(SIGCHLD, sigchld);
639 }
640 }
641
642 void
643 dump(char c) {
644 static int col;
645 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
646 if(++col % 10 == 0)
647 fprintf(stderr, "\n");
648 }
649
650 void
651 ttyread(void) {
652 static char buf[BUFSIZ];
653 static int buflen = 0;
654 char *ptr;
655 char s[UTF_SIZ];
656 int charsize; /* size of utf8 char in bytes */
657 long utf8c;
658 int ret;
659
660 /* append read bytes to unprocessed bytes */
661 if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
662 die("Couldn't read from shell: %s\n", SERRNO);
663
664 /* process every complete utf8 char */
665 buflen += ret;
666 ptr = buf;
667 while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
668 charsize = utf8decode(ptr, &utf8c);
669 utf8encode(&utf8c, s);
670 tputc(s);
671 ptr += charsize;
672 buflen -= charsize;
673 }
674
675 /* keep any uncomplete utf8 char for the next call */
676 memmove(buf, ptr, buflen);
677 }
678
679 void
680 ttywrite(const char *s, size_t n) {
681 if(write(cmdfd, s, n) == -1)
682 die("write error on tty: %s\n", SERRNO);
683 }
684
685 void
686 ttyresize(int x, int y) {
687 struct winsize w;
688
689 w.ws_row = term.row;
690 w.ws_col = term.col;
691 w.ws_xpixel = w.ws_ypixel = 0;
692 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
693 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
694 }
695
696 void
697 tcursor(int mode) {
698 static TCursor c;
699
700 if(mode == CURSOR_SAVE)
701 c = term.c;
702 else if(mode == CURSOR_LOAD)
703 term.c = c, tmoveto(c.x, c.y);
704 }
705
706 void
707 treset(void) {
708 term.c = (TCursor){{
709 .mode = ATTR_NULL,
710 .fg = DefaultFG,
711 .bg = DefaultBG
712 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
713
714 term.top = 0, term.bot = term.row - 1;
715 term.mode = MODE_WRAP;
716 tclearregion(0, 0, term.col-1, term.row-1);
717 }
718
719 void
720 tnew(int col, int row) {
721 /* set screen size */
722 term.row = row, term.col = col;
723 term.line = malloc(term.row * sizeof(Line));
724 term.alt = malloc(term.row * sizeof(Line));
725 for(row = 0 ; row < term.row; row++) {
726 term.line[row] = malloc(term.col * sizeof(Glyph));
727 term.alt [row] = malloc(term.col * sizeof(Glyph));
728 }
729 /* setup screen */
730 treset();
731 }
732
733 void
734 tswapscreen(void) {
735 Line* tmp = term.line;
736 term.line = term.alt;
737 term.alt = tmp;
738 term.mode ^= MODE_ALTSCREEN;
739 }
740
741 void
742 tscrolldown(int orig, int n) {
743 int i;
744 Line temp;
745
746 LIMIT(n, 0, term.bot-orig+1);
747
748 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
749
750 for(i = term.bot; i >= orig+n; i--) {
751 temp = term.line[i];
752 term.line[i] = term.line[i-n];
753 term.line[i-n] = temp;
754 }
755 }
756
757 void
758 tscrollup(int orig, int n) {
759 int i;
760 Line temp;
761 LIMIT(n, 0, term.bot-orig+1);
762
763 tclearregion(0, orig, term.col-1, orig+n-1);
764
765 for(i = orig; i <= term.bot-n; i++) {
766 temp = term.line[i];
767 term.line[i] = term.line[i+n];
768 term.line[i+n] = temp;
769 }
770 }
771
772 void
773 tnewline(int first_col) {
774 int y = term.c.y;
775 if(y == term.bot)
776 tscrollup(term.top, 1);
777 else
778 y++;
779 tmoveto(first_col ? 0 : term.c.x, y);
780 }
781
782 void
783 csiparse(void) {
784 /* int noarg = 1; */
785 char *p = escseq.buf;
786
787 escseq.narg = 0;
788 if(*p == '?')
789 escseq.priv = 1, p++;
790
791 while(p < escseq.buf+escseq.len) {
792 while(isdigit(*p)) {
793 escseq.arg[escseq.narg] *= 10;
794 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
795 }
796 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
797 escseq.narg++, p++;
798 else {
799 escseq.mode = *p;
800 escseq.narg++;
801 return;
802 }
803 }
804 }
805
806 void
807 tmoveto(int x, int y) {
808 LIMIT(x, 0, term.col-1);
809 LIMIT(y, 0, term.row-1);
810 term.c.state &= ~CURSOR_WRAPNEXT;
811 term.c.x = x;
812 term.c.y = y;
813 }
814
815 void
816 tsetchar(char *c) {
817 term.line[term.c.y][term.c.x] = term.c.attr;
818 memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
819 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
820 }
821
822 void
823 tclearregion(int x1, int y1, int x2, int y2) {
824 int x, y, temp;
825
826 if(x1 > x2)
827 temp = x1, x1 = x2, x2 = temp;
828 if(y1 > y2)
829 temp = y1, y1 = y2, y2 = temp;
830
831 LIMIT(x1, 0, term.col-1);
832 LIMIT(x2, 0, term.col-1);
833 LIMIT(y1, 0, term.row-1);
834 LIMIT(y2, 0, term.row-1);
835
836 for(y = y1; y <= y2; y++)
837 for(x = x1; x <= x2; x++)
838 term.line[y][x].state = 0;
839 }
840
841 void
842 tdeletechar(int n) {
843 int src = term.c.x + n;
844 int dst = term.c.x;
845 int size = term.col - src;
846
847 if(src >= term.col) {
848 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
849 return;
850 }
851 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
852 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
853 }
854
855 void
856 tinsertblank(int n) {
857 int src = term.c.x;
858 int dst = src + n;
859 int size = term.col - dst;
860
861 if(dst >= term.col) {
862 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
863 return;
864 }
865 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
866 tclearregion(src, term.c.y, dst - 1, term.c.y);
867 }
868
869 void
870 tinsertblankline(int n) {
871 if(term.c.y < term.top || term.c.y > term.bot)
872 return;
873
874 tscrolldown(term.c.y, n);
875 }
876
877 void
878 tdeleteline(int n) {
879 if(term.c.y < term.top || term.c.y > term.bot)
880 return;
881
882 tscrollup(term.c.y, n);
883 }
884
885 void
886 tsetattr(int *attr, int l) {
887 int i;
888
889 for(i = 0; i < l; i++) {
890 switch(attr[i]) {
891 case 0:
892 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
893 term.c.attr.fg = DefaultFG;
894 term.c.attr.bg = DefaultBG;
895 break;
896 case 1:
897 term.c.attr.mode |= ATTR_BOLD;
898 break;
899 case 4:
900 term.c.attr.mode |= ATTR_UNDERLINE;
901 break;
902 case 7:
903 term.c.attr.mode |= ATTR_REVERSE;
904 break;
905 case 22:
906 term.c.attr.mode &= ~ATTR_BOLD;
907 break;
908 case 24:
909 term.c.attr.mode &= ~ATTR_UNDERLINE;
910 break;
911 case 27:
912 term.c.attr.mode &= ~ATTR_REVERSE;
913 break;
914 case 38:
915 if(i + 2 < l && attr[i + 1] == 5) {
916 i += 2;
917 if(BETWEEN(attr[i], 0, 255))
918 term.c.attr.fg = attr[i];
919 else
920 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
921 }
922 else
923 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
924 break;
925 case 39:
926 term.c.attr.fg = DefaultFG;
927 break;
928 case 48:
929 if(i + 2 < l && attr[i + 1] == 5) {
930 i += 2;
931 if(BETWEEN(attr[i], 0, 255))
932 term.c.attr.bg = attr[i];
933 else
934 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
935 }
936 else
937 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
938 break;
939 case 49:
940 term.c.attr.bg = DefaultBG;
941 break;
942 default:
943 if(BETWEEN(attr[i], 30, 37))
944 term.c.attr.fg = attr[i] - 30;
945 else if(BETWEEN(attr[i], 40, 47))
946 term.c.attr.bg = attr[i] - 40;
947 else if(BETWEEN(attr[i], 90, 97))
948 term.c.attr.fg = attr[i] - 90 + 8;
949 else if(BETWEEN(attr[i], 100, 107))
950 term.c.attr.fg = attr[i] - 100 + 8;
951 else
952 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
953
954 break;
955 }
956 }
957 }
958
959 void
960 tsetscroll(int t, int b) {
961 int temp;
962
963 LIMIT(t, 0, term.row-1);
964 LIMIT(b, 0, term.row-1);
965 if(t > b) {
966 temp = t;
967 t = b;
968 b = temp;
969 }
970 term.top = t;
971 term.bot = b;
972 }
973
974 void
975 csihandle(void) {
976 switch(escseq.mode) {
977 default:
978 unknown:
979 fprintf(stderr, "erresc: unknown csi ");
980 csidump();
981 /* die(""); */
982 break;
983 case '@': /* ICH -- Insert <n> blank char */
984 DEFAULT(escseq.arg[0], 1);
985 tinsertblank(escseq.arg[0]);
986 break;
987 case 'A': /* CUU -- Cursor <n> Up */
988 case 'e':
989 DEFAULT(escseq.arg[0], 1);
990 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
991 break;
992 case 'B': /* CUD -- Cursor <n> Down */
993 DEFAULT(escseq.arg[0], 1);
994 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
995 break;
996 case 'C': /* CUF -- Cursor <n> Forward */
997 case 'a':
998 DEFAULT(escseq.arg[0], 1);
999 tmoveto(term.c.x+escseq.arg[0], term.c.y);
1000 break;
1001 case 'D': /* CUB -- Cursor <n> Backward */
1002 DEFAULT(escseq.arg[0], 1);
1003 tmoveto(term.c.x-escseq.arg[0], term.c.y);
1004 break;
1005 case 'E': /* CNL -- Cursor <n> Down and first col */
1006 DEFAULT(escseq.arg[0], 1);
1007 tmoveto(0, term.c.y+escseq.arg[0]);
1008 break;
1009 case 'F': /* CPL -- Cursor <n> Up and first col */
1010 DEFAULT(escseq.arg[0], 1);
1011 tmoveto(0, term.c.y-escseq.arg[0]);
1012 break;
1013 case 'G': /* CHA -- Move to <col> */
1014 case '`': /* XXX: HPA -- same? */
1015 DEFAULT(escseq.arg[0], 1);
1016 tmoveto(escseq.arg[0]-1, term.c.y);
1017 break;
1018 case 'H': /* CUP -- Move to <row> <col> */
1019 case 'f': /* XXX: HVP -- same? */
1020 DEFAULT(escseq.arg[0], 1);
1021 DEFAULT(escseq.arg[1], 1);
1022 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
1023 break;
1024 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
1025 case 'J': /* ED -- Clear screen */
1026 switch(escseq.arg[0]) {
1027 case 0: /* below */
1028 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1029 if(term.c.y < term.row-1)
1030 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1031 break;
1032 case 1: /* above */
1033 if(term.c.y > 1)
1034 tclearregion(0, 0, term.col-1, term.c.y-1);
1035 tclearregion(0, term.c.y, term.c.x, term.c.y);
1036 break;
1037 case 2: /* all */
1038 tclearregion(0, 0, term.col-1, term.row-1);
1039 break;
1040 default:
1041 goto unknown;
1042 }
1043 break;
1044 case 'K': /* EL -- Clear line */
1045 switch(escseq.arg[0]) {
1046 case 0: /* right */
1047 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1048 break;
1049 case 1: /* left */
1050 tclearregion(0, term.c.y, term.c.x, term.c.y);
1051 break;
1052 case 2: /* all */
1053 tclearregion(0, term.c.y, term.col-1, term.c.y);
1054 break;
1055 }
1056 break;
1057 case 'S': /* SU -- Scroll <n> line up */
1058 DEFAULT(escseq.arg[0], 1);
1059 tscrollup(term.top, escseq.arg[0]);
1060 break;
1061 case 'T': /* SD -- Scroll <n> line down */
1062 DEFAULT(escseq.arg[0], 1);
1063 tscrolldown(term.top, escseq.arg[0]);
1064 break;
1065 case 'L': /* IL -- Insert <n> blank lines */
1066 DEFAULT(escseq.arg[0], 1);
1067 tinsertblankline(escseq.arg[0]);
1068 break;
1069 case 'l': /* RM -- Reset Mode */
1070 if(escseq.priv) {
1071 switch(escseq.arg[0]) {
1072 case 1:
1073 term.mode &= ~MODE_APPKEYPAD;
1074 break;
1075 case 5: /* TODO: DECSCNM -- Remove reverse video */
1076 break;
1077 case 7:
1078 term.mode &= ~MODE_WRAP;
1079 break;
1080 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1081 break;
1082 case 20:
1083 term.mode &= ~MODE_CRLF;
1084 break;
1085 case 25:
1086 term.c.state |= CURSOR_HIDE;
1087 break;
1088 case 1049: /* = 1047 and 1048 */
1089 case 1047:
1090 if(IS_SET(MODE_ALTSCREEN)) {
1091 tclearregion(0, 0, term.col-1, term.row-1);
1092 tswapscreen();
1093 }
1094 if(escseq.arg[0] == 1047)
1095 break;
1096 case 1048:
1097 tcursor(CURSOR_LOAD);
1098 break;
1099 default:
1100 goto unknown;
1101 }
1102 } else {
1103 switch(escseq.arg[0]) {
1104 case 4:
1105 term.mode &= ~MODE_INSERT;
1106 break;
1107 default:
1108 goto unknown;
1109 }
1110 }
1111 break;
1112 case 'M': /* DL -- Delete <n> lines */
1113 DEFAULT(escseq.arg[0], 1);
1114 tdeleteline(escseq.arg[0]);
1115 break;
1116 case 'X': /* ECH -- Erase <n> char */
1117 DEFAULT(escseq.arg[0], 1);
1118 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1119 break;
1120 case 'P': /* DCH -- Delete <n> char */
1121 DEFAULT(escseq.arg[0], 1);
1122 tdeletechar(escseq.arg[0]);
1123 break;
1124 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1125 case 'd': /* VPA -- Move to <row> */
1126 DEFAULT(escseq.arg[0], 1);
1127 tmoveto(term.c.x, escseq.arg[0]-1);
1128 break;
1129 case 'h': /* SM -- Set terminal mode */
1130 if(escseq.priv) {
1131 switch(escseq.arg[0]) {
1132 case 1:
1133 term.mode |= MODE_APPKEYPAD;
1134 break;
1135 case 5: /* DECSCNM -- Reverve video */
1136 /* TODO: set REVERSE on the whole screen (f) */
1137 break;
1138 case 7:
1139 term.mode |= MODE_WRAP;
1140 break;
1141 case 20:
1142 term.mode |= MODE_CRLF;
1143 break;
1144 case 12: /* att610 -- Start blinking cursor (IGNORED) */
1145 /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1146 if(escseq.narg > 1 && escseq.arg[1] != 25)
1147 break;
1148 case 25:
1149 term.c.state &= ~CURSOR_HIDE;
1150 break;
1151 case 1049: /* = 1047 and 1048 */
1152 case 1047:
1153 if(IS_SET(MODE_ALTSCREEN))
1154 tclearregion(0, 0, term.col-1, term.row-1);
1155 else
1156 tswapscreen();
1157 if(escseq.arg[0] == 1047)
1158 break;
1159 case 1048:
1160 tcursor(CURSOR_SAVE);
1161 break;
1162 default: goto unknown;
1163 }
1164 } else {
1165 switch(escseq.arg[0]) {
1166 case 4:
1167 term.mode |= MODE_INSERT;
1168 break;
1169 default: goto unknown;
1170 }
1171 };
1172 break;
1173 case 'm': /* SGR -- Terminal attribute (color) */
1174 tsetattr(escseq.arg, escseq.narg);
1175 break;
1176 case 'r': /* DECSTBM -- Set Scrolling Region */
1177 if(escseq.priv)
1178 goto unknown;
1179 else {
1180 DEFAULT(escseq.arg[0], 1);
1181 DEFAULT(escseq.arg[1], term.row);
1182 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1183 tmoveto(0, 0);
1184 }
1185 break;
1186 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1187 tcursor(CURSOR_SAVE);
1188 break;
1189 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1190 tcursor(CURSOR_LOAD);
1191 break;
1192 }
1193 }
1194
1195 void
1196 csidump(void) {
1197 int i;
1198 printf("ESC [ %s", escseq.priv ? "? " : "");
1199 if(escseq.narg)
1200 for(i = 0; i < escseq.narg; i++)
1201 printf("%d ", escseq.arg[i]);
1202 if(escseq.mode)
1203 putchar(escseq.mode);
1204 putchar('\n');
1205 }
1206
1207 void
1208 csireset(void) {
1209 memset(&escseq, 0, sizeof(escseq));
1210 }
1211
1212 void
1213 tputtab(void) {
1214 int space = TAB - term.c.x % TAB;
1215 tmoveto(term.c.x + space, term.c.y);
1216 }
1217
1218 void
1219 tputc(char *c) {
1220 char ascii = *c;
1221 if(term.esc & ESC_START) {
1222 if(term.esc & ESC_CSI) {
1223 escseq.buf[escseq.len++] = ascii;
1224 if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1225 term.esc = 0;
1226 csiparse(), csihandle();
1227 }
1228 /* TODO: handle other OSC */
1229 } else if(term.esc & ESC_OSC) {
1230 if(ascii == ';') {
1231 term.titlelen = 0;
1232 term.esc = ESC_START | ESC_TITLE;
1233 }
1234 } else if(term.esc & ESC_TITLE) {
1235 if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1236 term.esc = 0;
1237 term.title[term.titlelen] = '\0';
1238 XStoreName(xw.dpy, xw.win, term.title);
1239 } else {
1240 term.title[term.titlelen++] = ascii;
1241 }
1242 } else if(term.esc & ESC_ALTCHARSET) {
1243 switch(ascii) {
1244 case '0': /* Line drawing crap */
1245 term.c.attr.mode |= ATTR_GFX;
1246 break;
1247 case 'B': /* Back to regular text */
1248 term.c.attr.mode &= ~ATTR_GFX;
1249 break;
1250 default:
1251 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1252 }
1253 term.esc = 0;
1254 } else {
1255 switch(ascii) {
1256 case '[':
1257 term.esc |= ESC_CSI;
1258 break;
1259 case ']':
1260 term.esc |= ESC_OSC;
1261 break;
1262 case '(':
1263 term.esc |= ESC_ALTCHARSET;
1264 break;
1265 case 'D': /* IND -- Linefeed */
1266 if(term.c.y == term.bot)
1267 tscrollup(term.top, 1);
1268 else
1269 tmoveto(term.c.x, term.c.y+1);
1270 term.esc = 0;
1271 break;
1272 case 'E': /* NEL -- Next line */
1273 tnewline(1); /* always go to first col */
1274 term.esc = 0;
1275 break;
1276 case 'M': /* RI -- Reverse index */
1277 if(term.c.y == term.top)
1278 tscrolldown(term.top, 1);
1279 else
1280 tmoveto(term.c.x, term.c.y-1);
1281 term.esc = 0;
1282 break;
1283 case 'c': /* RIS -- Reset to inital state */
1284 treset();
1285 term.esc = 0;
1286 break;
1287 case '=': /* DECPAM -- Application keypad */
1288 term.mode |= MODE_APPKEYPAD;
1289 term.esc = 0;
1290 break;
1291 case '>': /* DECPNM -- Normal keypad */
1292 term.mode &= ~MODE_APPKEYPAD;
1293 term.esc = 0;
1294 break;
1295 case '7': /* DECSC -- Save Cursor */
1296 tcursor(CURSOR_SAVE);
1297 term.esc = 0;
1298 break;
1299 case '8': /* DECRC -- Restore Cursor */
1300 tcursor(CURSOR_LOAD);
1301 term.esc = 0;
1302 break;
1303 default:
1304 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1305 (unsigned char) ascii, isprint(ascii)?ascii:'.');
1306 term.esc = 0;
1307 }
1308 }
1309 } else {
1310 switch(ascii) {
1311 case '\t':
1312 tputtab();
1313 break;
1314 case '\b':
1315 tmoveto(term.c.x-1, term.c.y);
1316 break;
1317 case '\r':
1318 tmoveto(0, term.c.y);
1319 break;
1320 case '\f':
1321 case '\v':
1322 case '\n':
1323 /* go to first col if the mode is set */
1324 tnewline(IS_SET(MODE_CRLF));
1325 break;
1326 case '\a':
1327 if(!(xw.state & WIN_FOCUSED))
1328 xseturgency(1);
1329 break;
1330 case '\033':
1331 csireset();
1332 term.esc = ESC_START;
1333 break;
1334 default:
1335 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1336 tnewline(1); /* always go to first col */
1337 tsetchar(c);
1338 if(term.c.x+1 < term.col)
1339 tmoveto(term.c.x+1, term.c.y);
1340 else
1341 term.c.state |= CURSOR_WRAPNEXT;
1342 }
1343 }
1344 }
1345
1346 int
1347 tresize(int col, int row) {
1348 int i, x;
1349 int minrow = MIN(row, term.row);
1350 int mincol = MIN(col, term.col);
1351 int slide = term.c.y - row + 1;
1352
1353 if(col < 1 || row < 1)
1354 return 0;
1355
1356 /* free unneeded rows */
1357 i = 0;
1358 if(slide > 0) {
1359 /* slide screen to keep cursor where we expect it -
1360 * tscrollup would work here, but we can optimize to
1361 * memmove because we're freeing the earlier lines */
1362 for(/* i = 0 */; i < slide; i++) {
1363 free(term.line[i]);
1364 free(term.alt[i]);
1365 }
1366 memmove(term.line, term.line + slide, row * sizeof(Line));
1367 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1368 }
1369 for(i += row; i < term.row; i++) {
1370 free(term.line[i]);
1371 free(term.alt[i]);
1372 }
1373
1374 /* resize to new height */
1375 term.line = realloc(term.line, row * sizeof(Line));
1376 term.alt = realloc(term.alt, row * sizeof(Line));
1377
1378 /* resize each row to new width, zero-pad if needed */
1379 for(i = 0; i < minrow; i++) {
1380 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1381 term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
1382 for(x = mincol; x < col; x++) {
1383 term.line[i][x].state = 0;
1384 term.alt[i][x].state = 0;
1385 }
1386 }
1387
1388 /* allocate any new rows */
1389 for(/* i == minrow */; i < row; i++) {
1390 term.line[i] = calloc(col, sizeof(Glyph));
1391 term.alt [i] = calloc(col, sizeof(Glyph));
1392 }
1393
1394 /* update terminal size */
1395 term.col = col, term.row = row;
1396 /* make use of the LIMIT in tmoveto */
1397 tmoveto(term.c.x, term.c.y);
1398 /* reset scrolling region */
1399 tsetscroll(0, row-1);
1400 return (slide > 0);
1401 }
1402
1403 void
1404 xresize(int col, int row) {
1405 Pixmap newbuf;
1406 int oldw, oldh;
1407
1408 oldw = xw.bufw;
1409 oldh = xw.bufh;
1410 xw.bufw = MAX(1, col * xw.cw);
1411 xw.bufh = MAX(1, row * xw.ch);
1412 newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1413 XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1414 XFreePixmap(xw.dpy, xw.buf);
1415 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1416 if(xw.bufw > oldw)
1417 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1418 xw.bufw-oldw, MIN(xw.bufh, oldh));
1419 else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1420 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1421 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1422 False);
1423 if(xw.bufh > oldh)
1424 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1425 xw.bufw, xw.bufh-oldh);
1426 else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1427 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1428 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1429 False);
1430 xw.buf = newbuf;
1431 }
1432
1433 void
1434 xloadcols(void) {
1435 int i, r, g, b;
1436 XColor color;
1437 unsigned long white = WhitePixel(xw.dpy, xw.scr);
1438
1439 for(i = 0; i < 16; i++) {
1440 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1441 dc.col[i] = white;
1442 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1443 } else
1444 dc.col[i] = color.pixel;
1445 }
1446
1447 /* same colors as xterm */
1448 for(r = 0; r < 6; r++)
1449 for(g = 0; g < 6; g++)
1450 for(b = 0; b < 6; b++) {
1451 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1452 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1453 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1454 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1455 dc.col[i] = white;
1456 fprintf(stderr, "Could not allocate color %d\n", i);
1457 } else
1458 dc.col[i] = color.pixel;
1459 i++;
1460 }
1461
1462 for(r = 0; r < 24; r++, i++) {
1463 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1464 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1465 dc.col[i] = white;
1466 fprintf(stderr, "Could not allocate color %d\n", i);
1467 } else
1468 dc.col[i] = color.pixel;
1469 }
1470 }
1471
1472 void
1473 xclear(int x1, int y1, int x2, int y2) {
1474 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1475 XFillRectangle(xw.dpy, xw.buf, dc.gc,
1476 x1 * xw.cw, y1 * xw.ch,
1477 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1478 }
1479
1480 void
1481 xhints(void) {
1482 XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1483 XWMHints wm = {.flags = InputHint, .input = 1};
1484 XSizeHints size = {
1485 .flags = PSize | PResizeInc | PBaseSize,
1486 .height = xw.h,
1487 .width = xw.w,
1488 .height_inc = xw.ch,
1489 .width_inc = xw.cw,
1490 .base_height = 2*BORDER,
1491 .base_width = 2*BORDER,
1492 };
1493 XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1494 }
1495
1496 XFontSet
1497 xinitfont(char *fontstr) {
1498 XFontSet set;
1499 char *def, **missing;
1500 int n;
1501
1502 missing = NULL;
1503 set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1504 if(missing) {
1505 while(n--)
1506 fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1507 XFreeStringList(missing);
1508 }
1509 return set;
1510 }
1511
1512 void
1513 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1514 XFontStruct **xfonts;
1515 char **font_names;
1516 int i, n;
1517
1518 *ascent = *descent = *lbearing = *rbearing = 0;
1519 n = XFontsOfFontSet(set, &xfonts, &font_names);
1520 for(i = 0; i < n; i++) {
1521 *ascent = MAX(*ascent, (*xfonts)->ascent);
1522 *descent = MAX(*descent, (*xfonts)->descent);
1523 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1524 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1525 xfonts++;
1526 }
1527 }
1528
1529 void
1530 initfonts(char *fontstr, char *bfontstr) {
1531 if((dc.font.set = xinitfont(fontstr)) == NULL ||
1532 (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1533 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1534 xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1535 &dc.font.lbearing, &dc.font.rbearing);
1536 xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1537 &dc.bfont.lbearing, &dc.bfont.rbearing);
1538 }
1539
1540 void
1541 xinit(void) {
1542 XSetWindowAttributes attrs;
1543 Cursor cursor;
1544
1545 if(!(xw.dpy = XOpenDisplay(NULL)))
1546 die("Can't open display\n");
1547 xw.scr = XDefaultScreen(xw.dpy);
1548
1549 /* font */
1550 initfonts(FONT, BOLDFONT);
1551
1552 /* XXX: Assuming same size for bold font */
1553 xw.cw = dc.font.rbearing - dc.font.lbearing;
1554 xw.ch = dc.font.ascent + dc.font.descent;
1555
1556 /* colors */
1557 xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1558 xloadcols();
1559
1560 /* window - default size */
1561 xw.bufh = 24 * xw.ch;
1562 xw.bufw = 80 * xw.cw;
1563 xw.h = xw.bufh + 2*BORDER;
1564 xw.w = xw.bufw + 2*BORDER;
1565
1566 attrs.background_pixel = dc.col[DefaultBG];
1567 attrs.border_pixel = dc.col[DefaultBG];
1568 attrs.bit_gravity = NorthWestGravity;
1569 attrs.event_mask = FocusChangeMask | KeyPressMask
1570 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1571 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1572 attrs.colormap = xw.cmap;
1573
1574 xw.win = XCreateWindow(xw.dpy, XRootWindow(xw.dpy, xw.scr), 0, 0,
1575 xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1576 XDefaultVisual(xw.dpy, xw.scr),
1577 CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1578 | CWColormap,
1579 &attrs);
1580 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1581
1582
1583 /* input methods */
1584 xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1585 xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1586 | XIMStatusNothing, XNClientWindow, xw.win,
1587 XNFocusWindow, xw.win, NULL);
1588 /* gc */
1589 dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1590
1591 /* white cursor, black outline */
1592 cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1593 XDefineCursor(xw.dpy, xw.win, cursor);
1594 XRecolorCursor(xw.dpy, cursor,
1595 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1596 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1597
1598 XMapWindow(xw.dpy, xw.win);
1599 xhints();
1600 XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1601 XSync(xw.dpy, 0);
1602 }
1603
1604 void
1605 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1606 unsigned long xfg, xbg;
1607 int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1608 int i;
1609
1610 if(base.mode & ATTR_REVERSE)
1611 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1612 else
1613 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1614
1615 XSetBackground(xw.dpy, dc.gc, xbg);
1616 XSetForeground(xw.dpy, dc.gc, xfg);
1617
1618 if(base.mode & ATTR_GFX) {
1619 for(i = 0; i < bytelen; i++) {
1620 char c = gfx[(unsigned int)s[i] % 256];
1621 if(c)
1622 s[i] = c;
1623 else if(s[i] > 0x5f)
1624 s[i] -= 0x5f;
1625 }
1626 }
1627
1628 XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1629 dc.gc, winx, winy, s, bytelen);
1630
1631 if(base.mode & ATTR_UNDERLINE)
1632 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1633 }
1634
1635 void
1636 xdrawcursor(void) {
1637 static int oldx = 0;
1638 static int oldy = 0;
1639 int sl;
1640 Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1641
1642 LIMIT(oldx, 0, term.col-1);
1643 LIMIT(oldy, 0, term.row-1);
1644
1645 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1646 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1647
1648 /* remove the old cursor */
1649 if(term.line[oldy][oldx].state & GLYPH_SET) {
1650 sl = utf8size(term.line[oldy][oldx].c);
1651 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1652 } else
1653 xclear(oldx, oldy, oldx, oldy);
1654
1655 /* draw the new one */
1656 if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1657 sl = utf8size(g.c);
1658 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1659 oldx = term.c.x, oldy = term.c.y;
1660 }
1661 }
1662
1663 void
1664 draw() {
1665 drawregion(0, 0, term.col, term.row);
1666 }
1667
1668 void
1669 drawregion(int x1, int y1, int x2, int y2) {
1670 int ic, ib, x, y, ox, sl;
1671 Glyph base, new;
1672 char buf[DRAW_BUF_SIZ];
1673
1674 if(!(xw.state & WIN_VISIBLE))
1675 return;
1676
1677 xclear(x1, y1, x2-1, y2-1);
1678 for(y = y1; y < y2; y++) {
1679 base = term.line[y][0];
1680 ic = ib = ox = 0;
1681 for(x = x1; x < x2; x++) {
1682 new = term.line[y][x];
1683 if(sel.bx != -1 && *(new.c) && selected(x, y))
1684 new.mode ^= ATTR_REVERSE;
1685 if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1686 ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1687 xdraws(buf, base, ox, y, ic, ib);
1688 ic = ib = 0;
1689 }
1690 if(new.state & GLYPH_SET) {
1691 if(ib == 0) {
1692 ox = x;
1693 base = new;
1694 }
1695 sl = utf8size(new.c);
1696 memcpy(buf+ib, new.c, sl);
1697 ib += sl;
1698 ++ic;
1699 }
1700 }
1701 if(ib > 0)
1702 xdraws(buf, base, ox, y, ic, ib);
1703 }
1704 xdrawcursor();
1705 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1706 }
1707
1708 void
1709 expose(XEvent *ev) {
1710 XExposeEvent *e = &ev->xexpose;
1711 if(xw.state & WIN_REDRAW) {
1712 if(!e->count) {
1713 xw.state &= ~WIN_REDRAW;
1714 draw();
1715 }
1716 } else
1717 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1718 e->width, e->height, e->x, e->y);
1719 }
1720
1721 void
1722 visibility(XEvent *ev) {
1723 XVisibilityEvent *e = &ev->xvisibility;
1724 if(e->state == VisibilityFullyObscured)
1725 xw.state &= ~WIN_VISIBLE;
1726 else if(!(xw.state & WIN_VISIBLE))
1727 /* need a full redraw for next Expose, not just a buf copy */
1728 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1729 }
1730
1731 void
1732 unmap(XEvent *ev) {
1733 xw.state &= ~WIN_VISIBLE;
1734 }
1735
1736 void
1737 xseturgency(int add) {
1738 XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1739 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1740 XSetWMHints(xw.dpy, xw.win, h);
1741 XFree(h);
1742 }
1743
1744 void
1745 focus(XEvent *ev) {
1746 if(ev->type == FocusIn) {
1747 xw.state |= WIN_FOCUSED;
1748 xseturgency(0);
1749 } else
1750 xw.state &= ~WIN_FOCUSED;
1751 draw();
1752 }
1753
1754 char*
1755 kmap(KeySym k, unsigned int state) {
1756 int i;
1757 for(i = 0; i < LEN(key); i++)
1758 if(key[i].k == k && (key[i].mask == 0 || key[i].mask & state))
1759 return (char*)key[i].s;
1760 return NULL;
1761 }
1762
1763 void
1764 kpress(XEvent *ev) {
1765 XKeyEvent *e = &ev->xkey;
1766 KeySym ksym;
1767 char buf[32];
1768 char *customkey;
1769 int len;
1770 int meta;
1771 int shift;
1772 Status status;
1773
1774 meta = e->state & Mod1Mask;
1775 shift = e->state & ShiftMask;
1776 len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1777
1778 /* 1. custom keys from config.h */
1779 if((customkey = kmap(ksym, e->state)))
1780 ttywrite(customkey, strlen(customkey));
1781 /* 2. hardcoded (overrides X lookup) */
1782 else
1783 switch(ksym) {
1784 case XK_Up:
1785 case XK_Down:
1786 case XK_Left:
1787 case XK_Right:
1788 /* XXX: shift up/down doesn't work */
1789 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
1790 ttywrite(buf, 3);
1791 break;
1792 case XK_Insert:
1793 if(shift)
1794 selpaste();
1795 break;
1796 case XK_Return:
1797 if(IS_SET(MODE_CRLF))
1798 ttywrite("\r\n", 2);
1799 else
1800 ttywrite("\r", 1);
1801 break;
1802 /* 3. X lookup */
1803 default:
1804 if(len > 0) {
1805 if(meta && len == 1)
1806 ttywrite("\033", 1);
1807 ttywrite(buf, len);
1808 }
1809 break;
1810 }
1811 }
1812
1813 void
1814 resize(XEvent *e) {
1815 int col, row;
1816
1817 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1818 return;
1819
1820 xw.w = e->xconfigure.width;
1821 xw.h = e->xconfigure.height;
1822 col = (xw.w - 2*BORDER) / xw.cw;
1823 row = (xw.h - 2*BORDER) / xw.ch;
1824 if(col == term.col && row == term.row)
1825 return;
1826 if(tresize(col, row))
1827 draw();
1828 ttyresize(col, row);
1829 xresize(col, row);
1830 }
1831
1832 void
1833 run(void) {
1834 XEvent ev;
1835 fd_set rfd;
1836 int xfd = XConnectionNumber(xw.dpy);
1837
1838 for(;;) {
1839 FD_ZERO(&rfd);
1840 FD_SET(cmdfd, &rfd);
1841 FD_SET(xfd, &rfd);
1842 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1843 if(errno == EINTR)
1844 continue;
1845 die("select failed: %s\n", SERRNO);
1846 }
1847 if(FD_ISSET(cmdfd, &rfd)) {
1848 ttyread();
1849 draw();
1850 }
1851 while(XPending(xw.dpy)) {
1852 XNextEvent(xw.dpy, &ev);
1853 if(XFilterEvent(&ev, xw.win))
1854 continue;
1855 if(handler[ev.type])
1856 (handler[ev.type])(&ev);
1857 }
1858 }
1859 }
1860
1861 int
1862 main(int argc, char *argv[]) {
1863 int i;
1864
1865 for(i = 1; i < argc; i++) {
1866 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1867 case 't':
1868 if(++i < argc) opt_title = argv[i];
1869 break;
1870 case 'c':
1871 if(++i < argc) opt_class = argv[i];
1872 break;
1873 case 'e':
1874 if(++i < argc) opt_cmd = &argv[i];
1875 break;
1876 case 'v':
1877 default:
1878 die(USAGE);
1879 }
1880 /* -e eats every remaining arguments */
1881 if(opt_cmd)
1882 break;
1883 }
1884 setlocale(LC_CTYPE, "");
1885 tnew(80, 24);
1886 ttynew();
1887 xinit();
1888 selinit();
1889 run();
1890 return 0;
1891 }