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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/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 *errstr, ...);
167 static void draw();
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 sel.mode = 0;
527 getbuttoninfo(e, &b, &sel.ex, &sel.ey);
528
529 if(sel.bx == sel.ex && sel.by == sel.ey) {
530 sel.bx = -1;
531 if(b == 2)
532 selpaste();
533
534 else if(b == 1) {
535 /* double click to select word */
536 struct timeval now;
537 gettimeofday(&now, NULL);
538
539 if(TIMEDIFFERENCE(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
540 sel.bx = sel.ex;
541 while(term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
542 term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
543 sel.b.x = sel.bx;
544 while(term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
545 term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
546 sel.e.x = sel.ex;
547 sel.b.y = sel.e.y = sel.ey;
548 selcopy();
549 }
550
551 /* triple click on the line */
552 if(TIMEDIFFERENCE(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
553 sel.b.x = sel.bx = 0;
554 sel.e.x = sel.ex = term.col;
555 sel.b.y = sel.e.y = sel.ey;
556 selcopy();
557 }
558 }
559 } else {
560 if(b == 1)
561 selcopy();
562 }
563 memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
564 gettimeofday(&sel.tclick1, NULL);
565 draw();
566 }
567
568 void
569 bmotion(XEvent *e) {
570 if(sel.mode) {
571 int oldey = sel.ey,
572 oldex = sel.ex;
573 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
574
575 if(oldey != sel.ey || oldex != sel.ex) {
576 int starty = MIN(oldey, sel.ey);
577 int endy = MAX(oldey, sel.ey);
578 drawregion(0, (starty > 0 ? starty : 0), term.col, (sel.ey < term.row ? endy+1 : term.row));
579 }
580 }
581 }
582
583 void
584 die(const char *errstr, ...) {
585 va_list ap;
586
587 va_start(ap, errstr);
588 vfprintf(stderr, errstr, ap);
589 va_end(ap);
590 exit(EXIT_FAILURE);
591 }
592
593 void
594 execsh(void) {
595 char **args;
596 char *envshell = getenv("SHELL");
597
598 DEFAULT(envshell, "sh");
599 putenv("TERM="TNAME);
600 args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
601 execvp(args[0], args);
602 exit(EXIT_FAILURE);
603 }
604
605 void
606 sigchld(int a) {
607 int stat = 0;
608 if(waitpid(pid, &stat, 0) < 0)
609 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
610 if(WIFEXITED(stat))
611 exit(WEXITSTATUS(stat));
612 else
613 exit(EXIT_FAILURE);
614 }
615
616 void
617 ttynew(void) {
618 int m, s;
619
620 /* seems to work fine on linux, openbsd and freebsd */
621 struct winsize w = {term.row, term.col, 0, 0};
622 if(openpty(&m, &s, NULL, NULL, &w) < 0)
623 die("openpty failed: %s\n", SERRNO);
624
625 switch(pid = fork()) {
626 case -1:
627 die("fork failed\n");
628 break;
629 case 0:
630 setsid(); /* create a new process group */
631 dup2(s, STDIN_FILENO);
632 dup2(s, STDOUT_FILENO);
633 dup2(s, STDERR_FILENO);
634 if(ioctl(s, TIOCSCTTY, NULL) < 0)
635 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
636 close(s);
637 close(m);
638 execsh();
639 break;
640 default:
641 close(s);
642 cmdfd = m;
643 signal(SIGCHLD, sigchld);
644 }
645 }
646
647 void
648 dump(char c) {
649 static int col;
650 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
651 if(++col % 10 == 0)
652 fprintf(stderr, "\n");
653 }
654
655 void
656 ttyread(void) {
657 static char buf[BUFSIZ];
658 static int buflen = 0;
659 char *ptr;
660 char s[UTF_SIZ];
661 int charsize; /* size of utf8 char in bytes */
662 long utf8c;
663 int ret;
664
665 /* append read bytes to unprocessed bytes */
666 if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
667 die("Couldn't read from shell: %s\n", SERRNO);
668
669 /* process every complete utf8 char */
670 buflen += ret;
671 ptr = buf;
672 while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
673 charsize = utf8decode(ptr, &utf8c);
674 utf8encode(&utf8c, s);
675 tputc(s);
676 ptr += charsize;
677 buflen -= charsize;
678 }
679
680 /* keep any uncomplete utf8 char for the next call */
681 memmove(buf, ptr, buflen);
682 }
683
684 void
685 ttywrite(const char *s, size_t n) {
686 {size_t nn;
687 for(nn = 0; nn < n; nn++)
688 dump(s[nn]);
689 }
690 if(write(cmdfd, s, n) == -1)
691 die("write error on tty: %s\n", SERRNO);
692 }
693
694 void
695 ttyresize(int x, int y) {
696 struct winsize w;
697
698 w.ws_row = term.row;
699 w.ws_col = term.col;
700 w.ws_xpixel = w.ws_ypixel = 0;
701 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
702 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
703 }
704
705 void
706 tcursor(int mode) {
707 static TCursor c;
708
709 if(mode == CURSOR_SAVE)
710 c = term.c;
711 else if(mode == CURSOR_LOAD)
712 term.c = c, tmoveto(c.x, c.y);
713 }
714
715 void
716 treset(void) {
717 term.c = (TCursor){{
718 .mode = ATTR_NULL,
719 .fg = DefaultFG,
720 .bg = DefaultBG
721 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
722
723 term.top = 0, term.bot = term.row - 1;
724 term.mode = MODE_WRAP;
725 tclearregion(0, 0, term.col-1, term.row-1);
726 }
727
728 void
729 tnew(int col, int row) {
730 /* set screen size */
731 term.row = row, term.col = col;
732 term.line = malloc(term.row * sizeof(Line));
733 term.alt = malloc(term.row * sizeof(Line));
734 for(row = 0 ; row < term.row; row++) {
735 term.line[row] = malloc(term.col * sizeof(Glyph));
736 term.alt [row] = malloc(term.col * sizeof(Glyph));
737 }
738 /* setup screen */
739 treset();
740 }
741
742 void
743 tswapscreen(void) {
744 Line* tmp = term.line;
745 term.line = term.alt;
746 term.alt = tmp;
747 term.mode ^= MODE_ALTSCREEN;
748 }
749
750 void
751 tscrolldown(int orig, int n) {
752 int i;
753 Line temp;
754
755 LIMIT(n, 0, term.bot-orig+1);
756
757 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
758
759 for(i = term.bot; i >= orig+n; i--) {
760 temp = term.line[i];
761 term.line[i] = term.line[i-n];
762 term.line[i-n] = temp;
763 }
764 }
765
766 void
767 tscrollup(int orig, int n) {
768 int i;
769 Line temp;
770 LIMIT(n, 0, term.bot-orig+1);
771
772 tclearregion(0, orig, term.col-1, orig+n-1);
773
774 for(i = orig; i <= term.bot-n; i++) {
775 temp = term.line[i];
776 term.line[i] = term.line[i+n];
777 term.line[i+n] = temp;
778 }
779 }
780
781 void
782 tnewline(int first_col) {
783 int y = term.c.y;
784 if(y == term.bot)
785 tscrollup(term.top, 1);
786 else
787 y++;
788 tmoveto(first_col ? 0 : term.c.x, y);
789 }
790
791 void
792 csiparse(void) {
793 /* int noarg = 1; */
794 char *p = escseq.buf;
795
796 escseq.narg = 0;
797 if(*p == '?')
798 escseq.priv = 1, p++;
799
800 while(p < escseq.buf+escseq.len) {
801 while(isdigit(*p)) {
802 escseq.arg[escseq.narg] *= 10;
803 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
804 }
805 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
806 escseq.narg++, p++;
807 else {
808 escseq.mode = *p;
809 escseq.narg++;
810 return;
811 }
812 }
813 }
814
815 void
816 tmoveto(int x, int y) {
817 LIMIT(x, 0, term.col-1);
818 LIMIT(y, 0, term.row-1);
819 term.c.state &= ~CURSOR_WRAPNEXT;
820 term.c.x = x;
821 term.c.y = y;
822 }
823
824 void
825 tsetchar(char *c) {
826 term.line[term.c.y][term.c.x] = term.c.attr;
827 memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
828 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
829 }
830
831 void
832 tclearregion(int x1, int y1, int x2, int y2) {
833 int x, y, temp;
834
835 if(x1 > x2)
836 temp = x1, x1 = x2, x2 = temp;
837 if(y1 > y2)
838 temp = y1, y1 = y2, y2 = temp;
839
840 LIMIT(x1, 0, term.col-1);
841 LIMIT(x2, 0, term.col-1);
842 LIMIT(y1, 0, term.row-1);
843 LIMIT(y2, 0, term.row-1);
844
845 for(y = y1; y <= y2; y++)
846 for(x = x1; x <= x2; x++)
847 term.line[y][x].state = 0;
848 }
849
850 void
851 tdeletechar(int n) {
852 int src = term.c.x + n;
853 int dst = term.c.x;
854 int size = term.col - src;
855
856 if(src >= term.col) {
857 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
858 return;
859 }
860 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
861 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
862 }
863
864 void
865 tinsertblank(int n) {
866 int src = term.c.x;
867 int dst = src + n;
868 int size = term.col - dst;
869
870 if(dst >= term.col) {
871 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
872 return;
873 }
874 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
875 tclearregion(src, term.c.y, dst - 1, term.c.y);
876 }
877
878 void
879 tinsertblankline(int n) {
880 if(term.c.y < term.top || term.c.y > term.bot)
881 return;
882
883 tscrolldown(term.c.y, n);
884 }
885
886 void
887 tdeleteline(int n) {
888 if(term.c.y < term.top || term.c.y > term.bot)
889 return;
890
891 tscrollup(term.c.y, n);
892 }
893
894 void
895 tsetattr(int *attr, int l) {
896 int i;
897
898 for(i = 0; i < l; i++) {
899 switch(attr[i]) {
900 case 0:
901 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
902 term.c.attr.fg = DefaultFG;
903 term.c.attr.bg = DefaultBG;
904 break;
905 case 1:
906 term.c.attr.mode |= ATTR_BOLD;
907 break;
908 case 4:
909 term.c.attr.mode |= ATTR_UNDERLINE;
910 break;
911 case 7:
912 term.c.attr.mode |= ATTR_REVERSE;
913 break;
914 case 22:
915 term.c.attr.mode &= ~ATTR_BOLD;
916 break;
917 case 24:
918 term.c.attr.mode &= ~ATTR_UNDERLINE;
919 break;
920 case 27:
921 term.c.attr.mode &= ~ATTR_REVERSE;
922 break;
923 case 38:
924 if (i + 2 < l && attr[i + 1] == 5) {
925 i += 2;
926 if (BETWEEN(attr[i], 0, 255))
927 term.c.attr.fg = attr[i];
928 else
929 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
930 }
931 else
932 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
933 break;
934 case 39:
935 term.c.attr.fg = DefaultFG;
936 break;
937 case 48:
938 if (i + 2 < l && attr[i + 1] == 5) {
939 i += 2;
940 if (BETWEEN(attr[i], 0, 255))
941 term.c.attr.bg = attr[i];
942 else
943 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
944 }
945 else
946 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
947 break;
948 case 49:
949 term.c.attr.bg = DefaultBG;
950 break;
951 default:
952 if(BETWEEN(attr[i], 30, 37))
953 term.c.attr.fg = attr[i] - 30;
954 else if(BETWEEN(attr[i], 40, 47))
955 term.c.attr.bg = attr[i] - 40;
956 else if(BETWEEN(attr[i], 90, 97))
957 term.c.attr.fg = attr[i] - 90 + 8;
958 else if(BETWEEN(attr[i], 100, 107))
959 term.c.attr.fg = attr[i] - 100 + 8;
960 else
961 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
962
963 break;
964 }
965 }
966 }
967
968 void
969 tsetscroll(int t, int b) {
970 int temp;
971
972 LIMIT(t, 0, term.row-1);
973 LIMIT(b, 0, term.row-1);
974 if(t > b) {
975 temp = t;
976 t = b;
977 b = temp;
978 }
979 term.top = t;
980 term.bot = b;
981 }
982
983 void
984 csihandle(void) {
985 switch(escseq.mode) {
986 default:
987 unknown:
988 fprintf(stderr, "erresc: unknown csi ");
989 csidump();
990 /* die(""); */
991 break;
992 case '@': /* ICH -- Insert <n> blank char */
993 DEFAULT(escseq.arg[0], 1);
994 tinsertblank(escseq.arg[0]);
995 break;
996 case 'A': /* CUU -- Cursor <n> Up */
997 case 'e':
998 DEFAULT(escseq.arg[0], 1);
999 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
1000 break;
1001 case 'B': /* CUD -- Cursor <n> Down */
1002 DEFAULT(escseq.arg[0], 1);
1003 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
1004 break;
1005 case 'C': /* CUF -- Cursor <n> Forward */
1006 case 'a':
1007 DEFAULT(escseq.arg[0], 1);
1008 tmoveto(term.c.x+escseq.arg[0], term.c.y);
1009 break;
1010 case 'D': /* CUB -- Cursor <n> Backward */
1011 DEFAULT(escseq.arg[0], 1);
1012 tmoveto(term.c.x-escseq.arg[0], term.c.y);
1013 break;
1014 case 'E': /* CNL -- Cursor <n> Down and first col */
1015 DEFAULT(escseq.arg[0], 1);
1016 tmoveto(0, term.c.y+escseq.arg[0]);
1017 break;
1018 case 'F': /* CPL -- Cursor <n> Up and first col */
1019 DEFAULT(escseq.arg[0], 1);
1020 tmoveto(0, term.c.y-escseq.arg[0]);
1021 break;
1022 case 'G': /* CHA -- Move to <col> */
1023 case '`': /* XXX: HPA -- same? */
1024 DEFAULT(escseq.arg[0], 1);
1025 tmoveto(escseq.arg[0]-1, term.c.y);
1026 break;
1027 case 'H': /* CUP -- Move to <row> <col> */
1028 case 'f': /* XXX: HVP -- same? */
1029 DEFAULT(escseq.arg[0], 1);
1030 DEFAULT(escseq.arg[1], 1);
1031 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
1032 break;
1033 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
1034 case 'J': /* ED -- Clear screen */
1035 switch(escseq.arg[0]) {
1036 case 0: /* below */
1037 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1038 if(term.c.y < term.row-1)
1039 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1040 break;
1041 case 1: /* above */
1042 if(term.c.y > 1)
1043 tclearregion(0, 0, term.col-1, term.c.y-1);
1044 tclearregion(0, term.c.y, term.c.x, term.c.y);
1045 break;
1046 case 2: /* all */
1047 tclearregion(0, 0, term.col-1, term.row-1);
1048 break;
1049 default:
1050 goto unknown;
1051 }
1052 break;
1053 case 'K': /* EL -- Clear line */
1054 switch(escseq.arg[0]) {
1055 case 0: /* right */
1056 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1057 break;
1058 case 1: /* left */
1059 tclearregion(0, term.c.y, term.c.x, term.c.y);
1060 break;
1061 case 2: /* all */
1062 tclearregion(0, term.c.y, term.col-1, term.c.y);
1063 break;
1064 }
1065 break;
1066 case 'S': /* SU -- Scroll <n> line up */
1067 DEFAULT(escseq.arg[0], 1);
1068 tscrollup(term.top, escseq.arg[0]);
1069 break;
1070 case 'T': /* SD -- Scroll <n> line down */
1071 DEFAULT(escseq.arg[0], 1);
1072 tscrolldown(term.top, escseq.arg[0]);
1073 break;
1074 case 'L': /* IL -- Insert <n> blank lines */
1075 DEFAULT(escseq.arg[0], 1);
1076 tinsertblankline(escseq.arg[0]);
1077 break;
1078 case 'l': /* RM -- Reset Mode */
1079 if(escseq.priv) {
1080 switch(escseq.arg[0]) {
1081 case 1:
1082 term.mode &= ~MODE_APPKEYPAD;
1083 break;
1084 case 5: /* TODO: DECSCNM -- Remove reverse video */
1085 break;
1086 case 7:
1087 term.mode &= ~MODE_WRAP;
1088 break;
1089 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1090 break;
1091 case 20:
1092 term.mode &= ~MODE_CRLF;
1093 break;
1094 case 25:
1095 term.c.state |= CURSOR_HIDE;
1096 break;
1097 case 1049: /* = 1047 and 1048 */
1098 case 1047:
1099 if(IS_SET(MODE_ALTSCREEN)) {
1100 tclearregion(0, 0, term.col-1, term.row-1);
1101 tswapscreen();
1102 }
1103 if(escseq.arg[0] == 1047)
1104 break;
1105 case 1048:
1106 tcursor(CURSOR_LOAD);
1107 break;
1108 default:
1109 goto unknown;
1110 }
1111 } else {
1112 switch(escseq.arg[0]) {
1113 case 4:
1114 term.mode &= ~MODE_INSERT;
1115 break;
1116 default:
1117 goto unknown;
1118 }
1119 }
1120 break;
1121 case 'M': /* DL -- Delete <n> lines */
1122 DEFAULT(escseq.arg[0], 1);
1123 tdeleteline(escseq.arg[0]);
1124 break;
1125 case 'X': /* ECH -- Erase <n> char */
1126 DEFAULT(escseq.arg[0], 1);
1127 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1128 break;
1129 case 'P': /* DCH -- Delete <n> char */
1130 DEFAULT(escseq.arg[0], 1);
1131 tdeletechar(escseq.arg[0]);
1132 break;
1133 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1134 case 'd': /* VPA -- Move to <row> */
1135 DEFAULT(escseq.arg[0], 1);
1136 tmoveto(term.c.x, escseq.arg[0]-1);
1137 break;
1138 case 'h': /* SM -- Set terminal mode */
1139 if(escseq.priv) {
1140 switch(escseq.arg[0]) {
1141 case 1:
1142 term.mode |= MODE_APPKEYPAD;
1143 break;
1144 case 5: /* DECSCNM -- Reverve video */
1145 /* TODO: set REVERSE on the whole screen (f) */
1146 break;
1147 case 7:
1148 term.mode |= MODE_WRAP;
1149 break;
1150 case 20:
1151 term.mode |= MODE_CRLF;
1152 break;
1153 case 12: /* att610 -- Start blinking cursor (IGNORED) */
1154 /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1155 if(escseq.narg > 1 && escseq.arg[1] != 25)
1156 break;
1157 case 25:
1158 term.c.state &= ~CURSOR_HIDE;
1159 break;
1160 case 1049: /* = 1047 and 1048 */
1161 case 1047:
1162 if(IS_SET(MODE_ALTSCREEN))
1163 tclearregion(0, 0, term.col-1, term.row-1);
1164 else
1165 tswapscreen();
1166 if(escseq.arg[0] == 1047)
1167 break;
1168 case 1048:
1169 tcursor(CURSOR_SAVE);
1170 break;
1171 default: goto unknown;
1172 }
1173 } else {
1174 switch(escseq.arg[0]) {
1175 case 4:
1176 term.mode |= MODE_INSERT;
1177 break;
1178 default: goto unknown;
1179 }
1180 };
1181 break;
1182 case 'm': /* SGR -- Terminal attribute (color) */
1183 tsetattr(escseq.arg, escseq.narg);
1184 break;
1185 case 'r': /* DECSTBM -- Set Scrolling Region */
1186 if(escseq.priv)
1187 goto unknown;
1188 else {
1189 DEFAULT(escseq.arg[0], 1);
1190 DEFAULT(escseq.arg[1], term.row);
1191 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1192 tmoveto(0, 0);
1193 }
1194 break;
1195 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1196 tcursor(CURSOR_SAVE);
1197 break;
1198 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1199 tcursor(CURSOR_LOAD);
1200 break;
1201 }
1202 }
1203
1204 void
1205 csidump(void) {
1206 int i;
1207 printf("ESC [ %s", escseq.priv ? "? " : "");
1208 if(escseq.narg)
1209 for(i = 0; i < escseq.narg; i++)
1210 printf("%d ", escseq.arg[i]);
1211 if(escseq.mode)
1212 putchar(escseq.mode);
1213 putchar('\n');
1214 }
1215
1216 void
1217 csireset(void) {
1218 memset(&escseq, 0, sizeof(escseq));
1219 }
1220
1221 void
1222 tputtab(void) {
1223 int space = TAB - term.c.x % TAB;
1224 tmoveto(term.c.x + space, term.c.y);
1225 }
1226
1227 void
1228 tputc(char *c) {
1229 char ascii = *c;
1230 if(term.esc & ESC_START) {
1231 if(term.esc & ESC_CSI) {
1232 escseq.buf[escseq.len++] = ascii;
1233 if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1234 term.esc = 0;
1235 csiparse(), csihandle();
1236 }
1237 /* TODO: handle other OSC */
1238 } else if(term.esc & ESC_OSC) {
1239 if(ascii == ';') {
1240 term.titlelen = 0;
1241 term.esc = ESC_START | ESC_TITLE;
1242 }
1243 } else if(term.esc & ESC_TITLE) {
1244 if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1245 term.esc = 0;
1246 term.title[term.titlelen] = '\0';
1247 XStoreName(xw.dpy, xw.win, term.title);
1248 } else {
1249 term.title[term.titlelen++] = ascii;
1250 }
1251 } else if(term.esc & ESC_ALTCHARSET) {
1252 switch(ascii) {
1253 case '0': /* Line drawing crap */
1254 term.c.attr.mode |= ATTR_GFX;
1255 break;
1256 case 'B': /* Back to regular text */
1257 term.c.attr.mode &= ~ATTR_GFX;
1258 break;
1259 default:
1260 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1261 }
1262 term.esc = 0;
1263 } else {
1264 switch(ascii) {
1265 case '[':
1266 term.esc |= ESC_CSI;
1267 break;
1268 case ']':
1269 term.esc |= ESC_OSC;
1270 break;
1271 case '(':
1272 term.esc |= ESC_ALTCHARSET;
1273 break;
1274 case 'D': /* IND -- Linefeed */
1275 if(term.c.y == term.bot)
1276 tscrollup(term.top, 1);
1277 else
1278 tmoveto(term.c.x, term.c.y+1);
1279 term.esc = 0;
1280 break;
1281 case 'E': /* NEL -- Next line */
1282 tnewline(1); /* always go to first col */
1283 term.esc = 0;
1284 break;
1285 case 'M': /* RI -- Reverse index */
1286 if(term.c.y == term.top)
1287 tscrolldown(term.top, 1);
1288 else
1289 tmoveto(term.c.x, term.c.y-1);
1290 term.esc = 0;
1291 break;
1292 case 'c': /* RIS -- Reset to inital state */
1293 treset();
1294 term.esc = 0;
1295 break;
1296 case '=': /* DECPAM -- Application keypad */
1297 term.mode |= MODE_APPKEYPAD;
1298 term.esc = 0;
1299 break;
1300 case '>': /* DECPNM -- Normal keypad */
1301 term.mode &= ~MODE_APPKEYPAD;
1302 term.esc = 0;
1303 break;
1304 case '7': /* DECSC -- Save Cursor */
1305 tcursor(CURSOR_SAVE);
1306 term.esc = 0;
1307 break;
1308 case '8': /* DECRC -- Restore Cursor */
1309 tcursor(CURSOR_LOAD);
1310 term.esc = 0;
1311 break;
1312 default:
1313 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1314 (unsigned char) ascii, isprint(ascii)?ascii:'.');
1315 term.esc = 0;
1316 }
1317 }
1318 } else {
1319 switch(ascii) {
1320 case '\t':
1321 tputtab();
1322 break;
1323 case '\b':
1324 tmoveto(term.c.x-1, term.c.y);
1325 break;
1326 case '\r':
1327 tmoveto(0, term.c.y);
1328 break;
1329 case '\f':
1330 case '\v':
1331 case '\n':
1332 /* go to first col if the mode is set */
1333 tnewline(IS_SET(MODE_CRLF));
1334 break;
1335 case '\a':
1336 if(!(xw.state & WIN_FOCUSED))
1337 xseturgency(1);
1338 break;
1339 case '\033':
1340 csireset();
1341 term.esc = ESC_START;
1342 break;
1343 default:
1344 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1345 tnewline(1); /* always go to first col */
1346 tsetchar(c);
1347 if(term.c.x+1 < term.col)
1348 tmoveto(term.c.x+1, term.c.y);
1349 else
1350 term.c.state |= CURSOR_WRAPNEXT;
1351 break;
1352 }
1353 }
1354 }
1355
1356 int
1357 tresize(int col, int row) {
1358 int i, x;
1359 int minrow = MIN(row, term.row);
1360 int mincol = MIN(col, term.col);
1361 int slide = term.c.y - row + 1;
1362
1363 if(col < 1 || row < 1)
1364 return 0;
1365
1366 /* free unneeded rows */
1367 i = 0;
1368 if(slide > 0) {
1369 /* slide screen to keep cursor where we expect it -
1370 * tscrollup would work here, but we can optimize to
1371 * memmove because we're freeing the earlier lines */
1372 for(/* i = 0 */; i < slide; i++) {
1373 free(term.line[i]);
1374 free(term.alt[i]);
1375 }
1376 memmove(term.line, term.line + slide, row * sizeof(Line));
1377 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1378 }
1379 for(i += row; i < term.row; i++) {
1380 free(term.line[i]);
1381 free(term.alt[i]);
1382 }
1383
1384 /* resize to new height */
1385 term.line = realloc(term.line, row * sizeof(Line));
1386 term.alt = realloc(term.alt, row * sizeof(Line));
1387
1388 /* resize each row to new width, zero-pad if needed */
1389 for(i = 0; i < minrow; i++) {
1390 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1391 term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
1392 for(x = mincol; x < col; x++) {
1393 term.line[i][x].state = 0;
1394 term.alt[i][x].state = 0;
1395 }
1396 }
1397
1398 /* allocate any new rows */
1399 for(/* i == minrow */; i < row; i++) {
1400 term.line[i] = calloc(col, sizeof(Glyph));
1401 term.alt [i] = calloc(col, sizeof(Glyph));
1402 }
1403
1404 /* update terminal size */
1405 term.col = col, term.row = row;
1406 /* make use of the LIMIT in tmoveto */
1407 tmoveto(term.c.x, term.c.y);
1408 /* reset scrolling region */
1409 tsetscroll(0, row-1);
1410 return (slide > 0);
1411 }
1412
1413 void
1414 xresize(int col, int row) {
1415 Pixmap newbuf;
1416 int oldw, oldh;
1417
1418 oldw = xw.bufw;
1419 oldh = xw.bufh;
1420 xw.bufw = MAX(1, col * xw.cw);
1421 xw.bufh = MAX(1, row * xw.ch);
1422 newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1423 XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1424 XFreePixmap(xw.dpy, xw.buf);
1425 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1426 if(xw.bufw > oldw)
1427 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1428 xw.bufw-oldw, MIN(xw.bufh, oldh));
1429 else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1430 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1431 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1432 False);
1433 if(xw.bufh > oldh)
1434 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1435 xw.bufw, xw.bufh-oldh);
1436 else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1437 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1438 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1439 False);
1440 xw.buf = newbuf;
1441 }
1442
1443 void
1444 xloadcols(void) {
1445 int i, r, g, b;
1446 XColor color;
1447 unsigned long white = WhitePixel(xw.dpy, xw.scr);
1448
1449 for(i = 0; i < 16; i++) {
1450 if (!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1451 dc.col[i] = white;
1452 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1453 } else
1454 dc.col[i] = color.pixel;
1455 }
1456
1457 /* same colors as xterm */
1458 for(r = 0; r < 6; r++)
1459 for(g = 0; g < 6; g++)
1460 for(b = 0; b < 6; b++) {
1461 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1462 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1463 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
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 i++;
1470 }
1471
1472 for(r = 0; r < 24; r++, i++) {
1473 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1474 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1475 dc.col[i] = white;
1476 fprintf(stderr, "Could not allocate color %d\n", i);
1477 } else
1478 dc.col[i] = color.pixel;
1479 }
1480 }
1481
1482 void
1483 xclear(int x1, int y1, int x2, int y2) {
1484 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1485 XFillRectangle(xw.dpy, xw.buf, dc.gc,
1486 x1 * xw.cw, y1 * xw.ch,
1487 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1488 }
1489
1490 void
1491 xhints(void)
1492 {
1493 XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1494 XWMHints wm = {.flags = InputHint, .input = 1};
1495 XSizeHints size = {
1496 .flags = PSize | PResizeInc | PBaseSize,
1497 .height = xw.h,
1498 .width = xw.w,
1499 .height_inc = xw.ch,
1500 .width_inc = xw.cw,
1501 .base_height = 2*BORDER,
1502 .base_width = 2*BORDER,
1503 };
1504 XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1505 }
1506
1507 XFontSet
1508 xinitfont(char *fontstr)
1509 {
1510 XFontSet set;
1511 char *def, **missing;
1512 int n;
1513
1514 missing = NULL;
1515 set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1516 if(missing) {
1517 while(n--)
1518 fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1519 XFreeStringList(missing);
1520 }
1521 return set;
1522 }
1523
1524 void
1525 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing)
1526 {
1527 XFontStruct **xfonts;
1528 char **font_names;
1529 int i, n;
1530
1531 *ascent = *descent = *lbearing = *rbearing = 0;
1532 n = XFontsOfFontSet(set, &xfonts, &font_names);
1533 for(i = 0; i < n; i++) {
1534 *ascent = MAX(*ascent, (*xfonts)->ascent);
1535 *descent = MAX(*descent, (*xfonts)->descent);
1536 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1537 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1538 xfonts++;
1539 }
1540 }
1541
1542 void
1543 initfonts(char *fontstr, char *bfontstr)
1544 {
1545 if((dc.font.set = xinitfont(fontstr)) == NULL ||
1546 (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1547 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1548 xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1549 &dc.font.lbearing, &dc.font.rbearing);
1550 xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1551 &dc.bfont.lbearing, &dc.bfont.rbearing);
1552 }
1553
1554 void
1555 xinit(void) {
1556 XSetWindowAttributes attrs;
1557 Cursor cursor;
1558
1559 if(!(xw.dpy = XOpenDisplay(NULL)))
1560 die("Can't open display\n");
1561 xw.scr = XDefaultScreen(xw.dpy);
1562
1563 /* font */
1564 initfonts(FONT, BOLDFONT);
1565
1566 /* XXX: Assuming same size for bold font */
1567 xw.cw = dc.font.rbearing - dc.font.lbearing;
1568 xw.ch = dc.font.ascent + dc.font.descent;
1569
1570 /* colors */
1571 xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1572 xloadcols();
1573
1574 /* window - default size */
1575 xw.bufh = 24 * xw.ch;
1576 xw.bufw = 80 * xw.cw;
1577 xw.h = xw.bufh + 2*BORDER;
1578 xw.w = xw.bufw + 2*BORDER;
1579
1580 attrs.background_pixel = dc.col[DefaultBG];
1581 attrs.border_pixel = dc.col[DefaultBG];
1582 attrs.bit_gravity = NorthWestGravity;
1583 attrs.event_mask = FocusChangeMask | KeyPressMask
1584 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1585 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1586 attrs.colormap = xw.cmap;
1587
1588 xw.win = XCreateWindow(xw.dpy, XRootWindow(xw.dpy, xw.scr), 0, 0,
1589 xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1590 XDefaultVisual(xw.dpy, xw.scr),
1591 CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1592 | CWColormap,
1593 &attrs);
1594 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1595
1596
1597 /* input methods */
1598 xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1599 xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1600 | XIMStatusNothing, XNClientWindow, xw.win,
1601 XNFocusWindow, xw.win, NULL);
1602 /* gc */
1603 dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1604
1605 /* white cursor, black outline */
1606 cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1607 XDefineCursor(xw.dpy, xw.win, cursor);
1608 XRecolorCursor(xw.dpy, cursor,
1609 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1610 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1611
1612 XMapWindow(xw.dpy, xw.win);
1613 xhints();
1614 XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1615 XSync(xw.dpy, 0);
1616 }
1617
1618 void
1619 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1620 unsigned long xfg, xbg;
1621 int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1622 int i;
1623
1624 if(base.mode & ATTR_REVERSE)
1625 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1626 else
1627 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1628
1629 XSetBackground(xw.dpy, dc.gc, xbg);
1630 XSetForeground(xw.dpy, dc.gc, xfg);
1631
1632 if(base.mode & ATTR_GFX) {
1633 for(i = 0; i < bytelen; i++) {
1634 char c = gfx[(unsigned int)s[i] % 256];
1635 if(c)
1636 s[i] = c;
1637 else if(s[i] > 0x5f)
1638 s[i] -= 0x5f;
1639 }
1640 }
1641
1642 XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1643 dc.gc, winx, winy, s, bytelen);
1644
1645 if(base.mode & ATTR_UNDERLINE)
1646 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1647 }
1648
1649 void
1650 xdrawcursor(void) {
1651 static int oldx = 0;
1652 static int oldy = 0;
1653 int sl;
1654 Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1655
1656 LIMIT(oldx, 0, term.col-1);
1657 LIMIT(oldy, 0, term.row-1);
1658
1659 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1660 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1661
1662 /* remove the old cursor */
1663 if(term.line[oldy][oldx].state & GLYPH_SET) {
1664 sl = utf8size(term.line[oldy][oldx].c);
1665 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1666 } else
1667 xclear(oldx, oldy, oldx, oldy);
1668
1669 /* draw the new one */
1670 if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1671 sl = utf8size(g.c);
1672 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1673 oldx = term.c.x, oldy = term.c.y;
1674 }
1675 }
1676
1677 #ifdef DEBUG
1678 /* basic drawing routines */
1679 void
1680 xdrawc(int x, int y, Glyph g) {
1681 int sl = utf8size(g.c);
1682 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1683 XSetBackground(xw.dpy, dc.gc, dc.col[g.bg]);
1684 XSetForeground(xw.dpy, dc.gc, dc.col[g.fg]);
1685 XmbDrawImageString(xw.dpy, xw.buf, g.mode&ATTR_BOLD?dc.bfont.fs:dc.font.fs,
1686 dc.gc, r.x, r.y+dc.font.ascent, g.c, sl);
1687 }
1688
1689 void
1690 drawregion(int x0, int x1, int y0, int y1) {
1691 draw();
1692 }
1693
1694 void
1695 draw() {
1696 int x, y;
1697
1698 xclear(0, 0, term.col-1, term.row-1);
1699 for(y = 0; y < term.row; y++)
1700 for(x = 0; x < term.col; x++)
1701 if(term.line[y][x].state & GLYPH_SET)
1702 xdrawc(x, y, term.line[y][x]);
1703
1704 xdrawcursor();
1705 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1706 XFlush(xw.dpy);
1707 }
1708
1709 #else
1710 /* optimized drawing routine */
1711 void
1712 draw() {
1713 drawregion(0, 0, term.col, term.row);
1714 }
1715
1716 void
1717 drawregion(int x1, int y1, int x2, int y2) {
1718 int ic, ib, x, y, ox, sl;
1719 Glyph base, new;
1720 char buf[DRAW_BUF_SIZ];
1721
1722 if(!(xw.state & WIN_VISIBLE))
1723 return;
1724
1725 xclear(x1, y1, x2-1, y2-1);
1726 for(y = y1; y < y2; y++) {
1727 base = term.line[y][0];
1728 ic = ib = ox = 0;
1729 for(x = x1; x < x2; x++) {
1730 new = term.line[y][x];
1731 if(sel.bx != -1 && *(new.c) && selected(x, y))
1732 new.mode ^= ATTR_REVERSE;
1733 if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1734 ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1735 xdraws(buf, base, ox, y, ic, ib);
1736 ic = ib = 0;
1737 }
1738 if(new.state & GLYPH_SET) {
1739 if(ib == 0) {
1740 ox = x;
1741 base = new;
1742 }
1743 sl = utf8size(new.c);
1744 memcpy(buf+ib, new.c, sl);
1745 ib += sl;
1746 ++ic;
1747 }
1748 }
1749 if(ib > 0)
1750 xdraws(buf, base, ox, y, ic, ib);
1751 }
1752 xdrawcursor();
1753 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1754 }
1755
1756 #endif
1757
1758 void
1759 expose(XEvent *ev) {
1760 XExposeEvent *e = &ev->xexpose;
1761 if(xw.state & WIN_REDRAW) {
1762 if(!e->count) {
1763 xw.state &= ~WIN_REDRAW;
1764 draw();
1765 }
1766 } else
1767 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1768 e->width, e->height, e->x, e->y);
1769 }
1770
1771 void
1772 visibility(XEvent *ev) {
1773 XVisibilityEvent *e = &ev->xvisibility;
1774 if(e->state == VisibilityFullyObscured)
1775 xw.state &= ~WIN_VISIBLE;
1776 else if(!(xw.state & WIN_VISIBLE))
1777 /* need a full redraw for next Expose, not just a buf copy */
1778 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1779 }
1780
1781 void
1782 unmap(XEvent *ev) {
1783 xw.state &= ~WIN_VISIBLE;
1784 }
1785
1786 void
1787 xseturgency(int add) {
1788 XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1789 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1790 XSetWMHints(xw.dpy, xw.win, h);
1791 XFree(h);
1792 }
1793
1794 void
1795 focus(XEvent *ev) {
1796 if(ev->type == FocusIn) {
1797 xw.state |= WIN_FOCUSED;
1798 xseturgency(0);
1799 } else
1800 xw.state &= ~WIN_FOCUSED;
1801 draw();
1802 }
1803
1804 char*
1805 kmap(KeySym k, unsigned int state) {
1806 int i;
1807 for(i = 0; i < LEN(key); i++)
1808 if(key[i].k == k && (key[i].mask == 0 || key[i].mask & state))
1809 return (char*)key[i].s;
1810 return NULL;
1811 }
1812
1813 void
1814 kpress(XEvent *ev) {
1815 XKeyEvent *e = &ev->xkey;
1816 KeySym ksym;
1817 char buf[32];
1818 char *customkey;
1819 int len;
1820 int meta;
1821 int shift;
1822 Status status;
1823
1824 meta = e->state & Mod1Mask;
1825 shift = e->state & ShiftMask;
1826 len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1827
1828 /* 1. custom keys from config.h */
1829 if((customkey = kmap(ksym, e->state)))
1830 ttywrite(customkey, strlen(customkey));
1831 /* 2. hardcoded (overrides X lookup) */
1832 else
1833 switch(ksym) {
1834 case XK_Up:
1835 case XK_Down:
1836 case XK_Left:
1837 case XK_Right:
1838 /* XXX: shift up/down doesn't work */
1839 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
1840 ttywrite(buf, 3);
1841 break;
1842 case XK_Insert:
1843 if(shift)
1844 selpaste();
1845 break;
1846 case XK_Return:
1847 if(IS_SET(MODE_CRLF))
1848 ttywrite("\r\n", 2);
1849 else
1850 ttywrite("\r", 1);
1851 break;
1852 /* 3. X lookup */
1853 default:
1854 if(len > 0) {
1855 if(meta && len == 1)
1856 ttywrite("\033", 1);
1857 ttywrite(buf, len);
1858 }
1859 break;
1860 }
1861 }
1862
1863 void
1864 resize(XEvent *e) {
1865 int col, row;
1866
1867 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1868 return;
1869
1870 xw.w = e->xconfigure.width;
1871 xw.h = e->xconfigure.height;
1872 col = (xw.w - 2*BORDER) / xw.cw;
1873 row = (xw.h - 2*BORDER) / xw.ch;
1874 if(col == term.col && row == term.row)
1875 return;
1876 if(tresize(col, row))
1877 draw();
1878 ttyresize(col, row);
1879 xresize(col, row);
1880 }
1881
1882 void
1883 run(void) {
1884 XEvent ev;
1885 fd_set rfd;
1886 int xfd = XConnectionNumber(xw.dpy);
1887
1888 for(;;) {
1889 FD_ZERO(&rfd);
1890 FD_SET(cmdfd, &rfd);
1891 FD_SET(xfd, &rfd);
1892 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1893 if(errno == EINTR)
1894 continue;
1895 die("select failed: %s\n", SERRNO);
1896 }
1897 if(FD_ISSET(cmdfd, &rfd)) {
1898 ttyread();
1899 draw();
1900 }
1901 while(XPending(xw.dpy)) {
1902 XNextEvent(xw.dpy, &ev);
1903 if (XFilterEvent(&ev, xw.win))
1904 continue;
1905 if(handler[ev.type])
1906 (handler[ev.type])(&ev);
1907 }
1908 }
1909 }
1910
1911 int
1912 main(int argc, char *argv[]) {
1913 int i;
1914
1915 for(i = 1; i < argc; i++) {
1916 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1917 case 't':
1918 if(++i < argc) opt_title = argv[i];
1919 break;
1920 case 'c':
1921 if(++i < argc) opt_class = argv[i];
1922 break;
1923 case 'e':
1924 if(++i < argc) opt_cmd = &argv[i];
1925 break;
1926 case 'v':
1927 default:
1928 die(USAGE);
1929 }
1930 /* -e eats every remaining arguments */
1931 if(opt_cmd)
1932 break;
1933 }
1934 setlocale(LC_CTYPE, "");
1935 tnew(80, 24);
1936 ttynew();
1937 xinit();
1938 selinit();
1939 run();
1940 return 0;
1941 }