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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) 2010-2011 st engineers\n" \
38 "usage: st [-t title] [-c class] [-v] [-e command...]\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 TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
57 #define X2COL(x) (((x) - BORDER)/xw.cw)
58 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
59
60 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
61 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
62 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
63 CURSOR_SAVE, CURSOR_LOAD };
64 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
65 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
66 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
67 MODE_CRLF=16, MODE_MOUSE=32, MODE_REVERSE=64 };
68 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
69 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
70
71 #undef B0
72 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
73
74 typedef struct {
75 char c[UTF_SIZ]; /* character code */
76 char mode; /* attribute flags */
77 int fg; /* foreground */
78 int bg; /* background */
79 char state; /* state flags */
80 } Glyph;
81
82 typedef Glyph* Line;
83
84 typedef struct {
85 Glyph attr; /* current char attributes */
86 int x;
87 int y;
88 char state;
89 } TCursor;
90
91 /* CSI Escape sequence structs */
92 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
93 typedef struct {
94 char buf[ESC_BUF_SIZ]; /* raw string */
95 int len; /* raw string length */
96 char priv;
97 int arg[ESC_ARG_SIZ];
98 int narg; /* nb of args */
99 char mode;
100 } CSIEscape;
101
102 /* Internal representation of the screen */
103 typedef struct {
104 int row; /* nb row */
105 int col; /* nb col */
106 Line* line; /* screen */
107 Line* alt; /* alternate screen */
108 TCursor c; /* cursor */
109 int top; /* top scroll limit */
110 int bot; /* bottom scroll limit */
111 int mode; /* terminal mode flags */
112 int esc; /* escape state flags */
113 char title[ESC_TITLE_SIZ];
114 int titlelen;
115 } Term;
116
117 /* Purely graphic info */
118 typedef struct {
119 Display* dpy;
120 Colormap cmap;
121 Window win;
122 Pixmap buf;
123 XIM xim;
124 XIC xic;
125 int scr;
126 int w; /* window width */
127 int h; /* window height */
128 int bufw; /* pixmap width */
129 int bufh; /* pixmap height */
130 int ch; /* char height */
131 int cw; /* char width */
132 char state; /* focus, redraw, visible */
133 } XWindow;
134
135 typedef struct {
136 KeySym k;
137 unsigned int mask;
138 char s[ESC_BUF_SIZ];
139 } Key;
140
141 /* Drawing Context */
142 typedef struct {
143 unsigned long col[256];
144 GC gc;
145 struct {
146 int ascent;
147 int descent;
148 short lbearing;
149 short rbearing;
150 XFontSet set;
151 } font, bfont;
152 } DC;
153
154 /* TODO: use better name for vars... */
155 typedef struct {
156 int mode;
157 int bx, by;
158 int ex, ey;
159 struct {int x, y;} b, e;
160 char *clip;
161 Atom xtarget;
162 struct timeval tclick1;
163 struct timeval tclick2;
164 } Selection;
165
166 #include "config.h"
167
168 static void die(const char*, ...);
169 static void draw(void);
170 static void drawregion(int, int, int, int);
171 static void execsh(void);
172 static void sigchld(int);
173 static void run(void);
174
175 static void csidump(void);
176 static void csihandle(void);
177 static void csiparse(void);
178 static void csireset(void);
179
180 static void tclearregion(int, int, int, int);
181 static void tcursor(int);
182 static void tdeletechar(int);
183 static void tdeleteline(int);
184 static void tinsertblank(int);
185 static void tinsertblankline(int);
186 static void tmoveto(int, int);
187 static void tnew(int, int);
188 static void tnewline(int);
189 static void tputtab(void);
190 static void tputc(char*);
191 static void treset(void);
192 static int tresize(int, int);
193 static void tscrollup(int, int);
194 static void tscrolldown(int, int);
195 static void tsetattr(int*, int);
196 static void tsetchar(char*);
197 static void tsetscroll(int, int);
198 static void tswapscreen(void);
199
200 static void ttynew(void);
201 static void ttyread(void);
202 static void ttyresize(int, int);
203 static void ttywrite(const char *, size_t);
204
205 static void xdraws(char *, Glyph, int, int, int, int);
206 static void xhints(void);
207 static void xclear(int, int, int, int);
208 static void xdrawcursor(void);
209 static void xinit(void);
210 static void xloadcols(void);
211 static void xseturgency(int);
212 static void xsetsel(char*);
213 static void xresize(int, int);
214
215 static void expose(XEvent *);
216 static void visibility(XEvent *);
217 static void unmap(XEvent *);
218 static char* kmap(KeySym, unsigned int state);
219 static void kpress(XEvent *);
220 static void resize(XEvent *);
221 static void focus(XEvent *);
222 static void brelease(XEvent *);
223 static void bpress(XEvent *);
224 static void bmotion(XEvent *);
225 static void selnotify(XEvent *);
226 static void selrequest(XEvent *);
227
228 static void selinit(void);
229 static inline int selected(int, int);
230 static void selcopy(void);
231 static void selpaste();
232
233 static int utf8decode(char *, long *);
234 static int utf8encode(long *, char *);
235 static int utf8size(char *);
236 static int isfullutf8(char *, int);
237
238 static void (*handler[LASTEvent])(XEvent *) = {
239 [KeyPress] = kpress,
240 [ConfigureNotify] = resize,
241 [VisibilityNotify] = visibility,
242 [UnmapNotify] = unmap,
243 [Expose] = expose,
244 [FocusIn] = focus,
245 [FocusOut] = focus,
246 [MotionNotify] = bmotion,
247 [ButtonPress] = bpress,
248 [ButtonRelease] = brelease,
249 [SelectionNotify] = selnotify,
250 [SelectionRequest] = selrequest,
251 };
252
253 /* Globals */
254 static DC dc;
255 static XWindow xw;
256 static Term term;
257 static CSIEscape escseq;
258 static int cmdfd;
259 static pid_t pid;
260 static Selection sel;
261 static char **opt_cmd = NULL;
262 static char *opt_title = NULL;
263 static char *opt_class = NULL;
264
265 int
266 utf8decode(char *s, long *u) {
267 unsigned char c;
268 int i, n, rtn;
269
270 rtn = 1;
271 c = *s;
272 if(~c&B7) { /* 0xxxxxxx */
273 *u = c;
274 return rtn;
275 } else if((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
276 *u = c&(B4|B3|B2|B1|B0);
277 n = 1;
278 } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
279 *u = c&(B3|B2|B1|B0);
280 n = 2;
281 } else if((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
282 *u = c&(B2|B1|B0);
283 n = 3;
284 } else
285 goto invalid;
286 for(i=n,++s; i>0; --i,++rtn,++s) {
287 c = *s;
288 if((c&(B7|B6)) != B7) /* 10xxxxxx */
289 goto invalid;
290 *u <<= 6;
291 *u |= c&(B5|B4|B3|B2|B1|B0);
292 }
293 if((n == 1 && *u < 0x80) ||
294 (n == 2 && *u < 0x800) ||
295 (n == 3 && *u < 0x10000) ||
296 (*u >= 0xD800 && *u <= 0xDFFF))
297 goto invalid;
298 return rtn;
299 invalid:
300 *u = 0xFFFD;
301 return rtn;
302 }
303
304 int
305 utf8encode(long *u, char *s) {
306 unsigned char *sp;
307 unsigned long uc;
308 int i, n;
309
310 sp = (unsigned char*) s;
311 uc = *u;
312 if(uc < 0x80) {
313 *sp = uc; /* 0xxxxxxx */
314 return 1;
315 } else if(*u < 0x800) {
316 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
317 n = 1;
318 } else if(uc < 0x10000) {
319 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
320 n = 2;
321 } else if(uc <= 0x10FFFF) {
322 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
323 n = 3;
324 } else {
325 goto invalid;
326 }
327 for(i=n,++sp; i>0; --i,++sp)
328 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
329 return n+1;
330 invalid:
331 /* U+FFFD */
332 *s++ = '\xEF';
333 *s++ = '\xBF';
334 *s = '\xBD';
335 return 3;
336 }
337
338 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
339 UTF-8 otherwise return 0 */
340 int
341 isfullutf8(char *s, int b) {
342 unsigned char *c1, *c2, *c3;
343
344 c1 = (unsigned char *) s;
345 c2 = (unsigned char *) ++s;
346 c3 = (unsigned char *) ++s;
347 if(b < 1)
348 return 0;
349 else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
350 return 0;
351 else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
352 ((b == 1) ||
353 ((b == 2) && (*c2&(B7|B6)) == B7)))
354 return 0;
355 else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
356 ((b == 1) ||
357 ((b == 2) && (*c2&(B7|B6)) == B7) ||
358 ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
359 return 0;
360 else
361 return 1;
362 }
363
364 int
365 utf8size(char *s) {
366 unsigned char c = *s;
367
368 if(~c&B7)
369 return 1;
370 else if((c&(B7|B6|B5)) == (B7|B6))
371 return 2;
372 else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
373 return 3;
374 else
375 return 4;
376 }
377
378 void
379 selinit(void) {
380 sel.tclick1.tv_sec = 0;
381 sel.tclick1.tv_usec = 0;
382 sel.mode = 0;
383 sel.bx = -1;
384 sel.clip = NULL;
385 sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
386 if(sel.xtarget == None)
387 sel.xtarget = XA_STRING;
388 }
389
390 static inline int
391 selected(int x, int y) {
392 if(sel.ey == y && sel.by == y) {
393 int bx = MIN(sel.bx, sel.ex);
394 int ex = MAX(sel.bx, sel.ex);
395 return BETWEEN(x, bx, ex);
396 }
397 return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
398 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
399 }
400
401 void
402 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
403 if(b)
404 *b = e->xbutton.button;
405
406 *x = X2COL(e->xbutton.x);
407 *y = Y2ROW(e->xbutton.y);
408 sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
409 sel.b.y = MIN(sel.by, sel.ey);
410 sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
411 sel.e.y = MAX(sel.by, sel.ey);
412 }
413
414 void
415 mousereport(XEvent *e) {
416 int x = X2COL(e->xbutton.x);
417 int y = Y2ROW(e->xbutton.y);
418 int button = e->xbutton.button;
419 int state = e->xbutton.state;
420 char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
421
422 if(!IS_SET(MODE_MOUSE))
423 return;
424
425 /* from urxvt */
426 if(e->xbutton.type == ButtonRelease || button == AnyButton)
427 button = 3;
428 else {
429 button -= Button1;
430 if(button >= 3)
431 button += 64 - 3;
432 }
433
434 buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
435 + (state & Mod4Mask ? 8 : 0)
436 + (state & ControlMask ? 16 : 0);
437
438 ttywrite(buf, sizeof(buf));
439 }
440
441 void
442 bpress(XEvent *e) {
443 mousereport(e);
444 sel.mode = 1;
445 sel.ex = sel.bx = X2COL(e->xbutton.x);
446 sel.ey = sel.by = Y2ROW(e->xbutton.y);
447 }
448
449 void
450 selcopy(void) {
451 char *str, *ptr;
452 int x, y, sz, sl, ls = 0;
453
454 if(sel.bx == -1)
455 str = NULL;
456 else {
457 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
458 ptr = str = malloc(sz);
459 for(y = 0; y < term.row; y++) {
460 for(x = 0; x < term.col; x++)
461 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
462 sl = utf8size(term.line[y][x].c);
463 memcpy(ptr, term.line[y][x].c, sl);
464 ptr += sl;
465 }
466 if(ls && y < sel.e.y)
467 *ptr++ = '\n';
468 }
469 *ptr = 0;
470 }
471 xsetsel(str);
472 }
473
474 void
475 selnotify(XEvent *e) {
476 unsigned long nitems;
477 unsigned long ofs, rem;
478 int format;
479 unsigned char *data;
480 Atom type;
481
482 ofs = 0;
483 do {
484 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
485 False, AnyPropertyType, &type, &format,
486 &nitems, &rem, &data)) {
487 fprintf(stderr, "Clipboard allocation failed\n");
488 return;
489 }
490 ttywrite((const char *) data, nitems * format / 8);
491 XFree(data);
492 /* number of 32-bit chunks returned */
493 ofs += nitems * format / 32;
494 } while(rem > 0);
495 }
496
497 void
498 selpaste() {
499 XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
500 }
501
502 void
503 selrequest(XEvent *e) {
504 XSelectionRequestEvent *xsre;
505 XSelectionEvent xev;
506 Atom xa_targets;
507
508 xsre = (XSelectionRequestEvent *) e;
509 xev.type = SelectionNotify;
510 xev.requestor = xsre->requestor;
511 xev.selection = xsre->selection;
512 xev.target = xsre->target;
513 xev.time = xsre->time;
514 /* reject */
515 xev.property = None;
516
517 xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
518 if(xsre->target == xa_targets) {
519 /* respond with the supported type */
520 Atom string = sel.xtarget;
521 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
522 XA_ATOM, 32, PropModeReplace,
523 (unsigned char *) &string, 1);
524 xev.property = xsre->property;
525 } else if(xsre->target == sel.xtarget) {
526 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
527 xsre->target, 8, PropModeReplace,
528 (unsigned char *) sel.clip, strlen(sel.clip));
529 xev.property = xsre->property;
530 }
531
532 /* all done, send a notification to the listener */
533 if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
534 fprintf(stderr, "Error sending SelectionNotify event\n");
535 }
536
537 void
538 xsetsel(char *str) {
539 /* register the selection for both the clipboard and the primary */
540 Atom clipboard;
541
542 free(sel.clip);
543 sel.clip = str;
544
545 XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
546
547 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
548 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
549
550 XFlush(xw.dpy);
551 }
552
553 void
554 brelease(XEvent *e) {
555 int b;
556
557 sel.mode = 0;
558 getbuttoninfo(e, &b, &sel.ex, &sel.ey);
559 mousereport(e);
560 if(sel.bx == sel.ex && sel.by == sel.ey) {
561 sel.bx = -1;
562 if(b == 2)
563 selpaste();
564 else if(b == 1) {
565 struct timeval now;
566 gettimeofday(&now, NULL);
567
568 if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
569 /* triple click on the line */
570 sel.b.x = sel.bx = 0;
571 sel.e.x = sel.ex = term.col;
572 sel.b.y = sel.e.y = sel.ey;
573 selcopy();
574 } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
575 /* double click to select word */
576 sel.bx = sel.ex;
577 while(term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
578 term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
579 sel.b.x = sel.bx;
580 while(term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
581 term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
582 sel.e.x = sel.ex;
583 sel.b.y = sel.e.y = sel.ey;
584 selcopy();
585 }
586 }
587 } else if(b == 1)
588 selcopy();
589 memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
590 gettimeofday(&sel.tclick1, NULL);
591 draw();
592 }
593
594 void
595 bmotion(XEvent *e) {
596 if(sel.mode) {
597 int oldey = sel.ey,
598 oldex = sel.ex;
599 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
600
601 if(oldey != sel.ey || oldex != sel.ex) {
602 int starty = MIN(oldey, sel.ey);
603 int endy = MAX(oldey, sel.ey);
604 drawregion(0, (starty > 0 ? starty : 0), term.col, (sel.ey < term.row ? endy+1 : term.row));
605 }
606 }
607 }
608
609 void
610 die(const char *errstr, ...) {
611 va_list ap;
612
613 va_start(ap, errstr);
614 vfprintf(stderr, errstr, ap);
615 va_end(ap);
616 exit(EXIT_FAILURE);
617 }
618
619 void
620 execsh(void) {
621 char **args;
622 char *envshell = getenv("SHELL");
623
624 DEFAULT(envshell, "sh");
625 putenv("TERM="TNAME);
626 args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
627 execvp(args[0], args);
628 exit(EXIT_FAILURE);
629 }
630
631 void
632 sigchld(int a) {
633 int stat = 0;
634 if(waitpid(pid, &stat, 0) < 0)
635 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
636 if(WIFEXITED(stat))
637 exit(WEXITSTATUS(stat));
638 else
639 exit(EXIT_FAILURE);
640 }
641
642 void
643 ttynew(void) {
644 int m, s;
645
646 /* seems to work fine on linux, openbsd and freebsd */
647 struct winsize w = {term.row, term.col, 0, 0};
648 if(openpty(&m, &s, NULL, NULL, &w) < 0)
649 die("openpty failed: %s\n", SERRNO);
650
651 switch(pid = fork()) {
652 case -1:
653 die("fork failed\n");
654 break;
655 case 0:
656 setsid(); /* create a new process group */
657 dup2(s, STDIN_FILENO);
658 dup2(s, STDOUT_FILENO);
659 dup2(s, STDERR_FILENO);
660 if(ioctl(s, TIOCSCTTY, NULL) < 0)
661 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
662 close(s);
663 close(m);
664 execsh();
665 break;
666 default:
667 close(s);
668 cmdfd = m;
669 signal(SIGCHLD, sigchld);
670 }
671 }
672
673 void
674 dump(char c) {
675 static int col;
676 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
677 if(++col % 10 == 0)
678 fprintf(stderr, "\n");
679 }
680
681 void
682 ttyread(void) {
683 static char buf[BUFSIZ];
684 static int buflen = 0;
685 char *ptr;
686 char s[UTF_SIZ];
687 int charsize; /* size of utf8 char in bytes */
688 long utf8c;
689 int ret;
690
691 /* append read bytes to unprocessed bytes */
692 if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
693 die("Couldn't read from shell: %s\n", SERRNO);
694
695 /* process every complete utf8 char */
696 buflen += ret;
697 ptr = buf;
698 while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
699 charsize = utf8decode(ptr, &utf8c);
700 utf8encode(&utf8c, s);
701 tputc(s);
702 ptr += charsize;
703 buflen -= charsize;
704 }
705
706 /* keep any uncomplete utf8 char for the next call */
707 memmove(buf, ptr, buflen);
708 }
709
710 void
711 ttywrite(const char *s, size_t n) {
712 if(write(cmdfd, s, n) == -1)
713 die("write error on tty: %s\n", SERRNO);
714 }
715
716 void
717 ttyresize(int x, int y) {
718 struct winsize w;
719
720 w.ws_row = term.row;
721 w.ws_col = term.col;
722 w.ws_xpixel = w.ws_ypixel = 0;
723 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
724 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
725 }
726
727 void
728 tcursor(int mode) {
729 static TCursor c;
730
731 if(mode == CURSOR_SAVE)
732 c = term.c;
733 else if(mode == CURSOR_LOAD)
734 term.c = c, tmoveto(c.x, c.y);
735 }
736
737 void
738 treset(void) {
739 term.c = (TCursor){{
740 .mode = ATTR_NULL,
741 .fg = DefaultFG,
742 .bg = DefaultBG
743 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
744
745 term.top = 0, term.bot = term.row - 1;
746 term.mode = MODE_WRAP;
747 tclearregion(0, 0, term.col-1, term.row-1);
748 }
749
750 void
751 tnew(int col, int row) {
752 /* set screen size */
753 term.row = row, term.col = col;
754 term.line = malloc(term.row * sizeof(Line));
755 term.alt = malloc(term.row * sizeof(Line));
756 for(row = 0 ; row < term.row; row++) {
757 term.line[row] = malloc(term.col * sizeof(Glyph));
758 term.alt [row] = malloc(term.col * sizeof(Glyph));
759 }
760 /* setup screen */
761 treset();
762 }
763
764 void
765 tswapscreen(void) {
766 Line* tmp = term.line;
767 term.line = term.alt;
768 term.alt = tmp;
769 term.mode ^= MODE_ALTSCREEN;
770 }
771
772 void
773 tscrolldown(int orig, int n) {
774 int i;
775 Line temp;
776
777 LIMIT(n, 0, term.bot-orig+1);
778
779 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
780
781 for(i = term.bot; i >= orig+n; i--) {
782 temp = term.line[i];
783 term.line[i] = term.line[i-n];
784 term.line[i-n] = temp;
785 }
786 }
787
788 void
789 tscrollup(int orig, int n) {
790 int i;
791 Line temp;
792 LIMIT(n, 0, term.bot-orig+1);
793
794 tclearregion(0, orig, term.col-1, orig+n-1);
795
796 for(i = orig; i <= term.bot-n; i++) {
797 temp = term.line[i];
798 term.line[i] = term.line[i+n];
799 term.line[i+n] = temp;
800 }
801 }
802
803 void
804 tnewline(int first_col) {
805 int y = term.c.y;
806 if(y == term.bot)
807 tscrollup(term.top, 1);
808 else
809 y++;
810 tmoveto(first_col ? 0 : term.c.x, y);
811 }
812
813 void
814 csiparse(void) {
815 /* int noarg = 1; */
816 char *p = escseq.buf;
817
818 escseq.narg = 0;
819 if(*p == '?')
820 escseq.priv = 1, p++;
821
822 while(p < escseq.buf+escseq.len) {
823 while(isdigit(*p)) {
824 escseq.arg[escseq.narg] *= 10;
825 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
826 }
827 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
828 escseq.narg++, p++;
829 else {
830 escseq.mode = *p;
831 escseq.narg++;
832 return;
833 }
834 }
835 }
836
837 void
838 tmoveto(int x, int y) {
839 LIMIT(x, 0, term.col-1);
840 LIMIT(y, 0, term.row-1);
841 term.c.state &= ~CURSOR_WRAPNEXT;
842 term.c.x = x;
843 term.c.y = y;
844 }
845
846 void
847 tsetchar(char *c) {
848 term.line[term.c.y][term.c.x] = term.c.attr;
849 memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
850 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
851 }
852
853 void
854 tclearregion(int x1, int y1, int x2, int y2) {
855 int x, y, temp;
856
857 if(x1 > x2)
858 temp = x1, x1 = x2, x2 = temp;
859 if(y1 > y2)
860 temp = y1, y1 = y2, y2 = temp;
861
862 LIMIT(x1, 0, term.col-1);
863 LIMIT(x2, 0, term.col-1);
864 LIMIT(y1, 0, term.row-1);
865 LIMIT(y2, 0, term.row-1);
866
867 for(y = y1; y <= y2; y++)
868 for(x = x1; x <= x2; x++)
869 term.line[y][x].state = 0;
870 }
871
872 void
873 tdeletechar(int n) {
874 int src = term.c.x + n;
875 int dst = term.c.x;
876 int size = term.col - src;
877
878 if(src >= term.col) {
879 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
880 return;
881 }
882 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
883 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
884 }
885
886 void
887 tinsertblank(int n) {
888 int src = term.c.x;
889 int dst = src + n;
890 int size = term.col - dst;
891
892 if(dst >= term.col) {
893 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
894 return;
895 }
896 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
897 tclearregion(src, term.c.y, dst - 1, term.c.y);
898 }
899
900 void
901 tinsertblankline(int n) {
902 if(term.c.y < term.top || term.c.y > term.bot)
903 return;
904
905 tscrolldown(term.c.y, n);
906 }
907
908 void
909 tdeleteline(int n) {
910 if(term.c.y < term.top || term.c.y > term.bot)
911 return;
912
913 tscrollup(term.c.y, n);
914 }
915
916 void
917 tsetattr(int *attr, int l) {
918 int i;
919
920 for(i = 0; i < l; i++) {
921 switch(attr[i]) {
922 case 0:
923 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
924 term.c.attr.fg = DefaultFG;
925 term.c.attr.bg = DefaultBG;
926 break;
927 case 1:
928 term.c.attr.mode |= ATTR_BOLD;
929 break;
930 case 4:
931 term.c.attr.mode |= ATTR_UNDERLINE;
932 break;
933 case 7:
934 term.c.attr.mode |= ATTR_REVERSE;
935 break;
936 case 22:
937 term.c.attr.mode &= ~ATTR_BOLD;
938 break;
939 case 24:
940 term.c.attr.mode &= ~ATTR_UNDERLINE;
941 break;
942 case 27:
943 term.c.attr.mode &= ~ATTR_REVERSE;
944 break;
945 case 38:
946 if(i + 2 < l && attr[i + 1] == 5) {
947 i += 2;
948 if(BETWEEN(attr[i], 0, 255))
949 term.c.attr.fg = attr[i];
950 else
951 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
952 }
953 else
954 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
955 break;
956 case 39:
957 term.c.attr.fg = DefaultFG;
958 break;
959 case 48:
960 if(i + 2 < l && attr[i + 1] == 5) {
961 i += 2;
962 if(BETWEEN(attr[i], 0, 255))
963 term.c.attr.bg = attr[i];
964 else
965 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
966 }
967 else
968 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
969 break;
970 case 49:
971 term.c.attr.bg = DefaultBG;
972 break;
973 default:
974 if(BETWEEN(attr[i], 30, 37))
975 term.c.attr.fg = attr[i] - 30;
976 else if(BETWEEN(attr[i], 40, 47))
977 term.c.attr.bg = attr[i] - 40;
978 else if(BETWEEN(attr[i], 90, 97))
979 term.c.attr.fg = attr[i] - 90 + 8;
980 else if(BETWEEN(attr[i], 100, 107))
981 term.c.attr.fg = attr[i] - 100 + 8;
982 else
983 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
984
985 break;
986 }
987 }
988 }
989
990 void
991 tsetscroll(int t, int b) {
992 int temp;
993
994 LIMIT(t, 0, term.row-1);
995 LIMIT(b, 0, term.row-1);
996 if(t > b) {
997 temp = t;
998 t = b;
999 b = temp;
1000 }
1001 term.top = t;
1002 term.bot = b;
1003 }
1004
1005 void
1006 csihandle(void) {
1007 switch(escseq.mode) {
1008 default:
1009 unknown:
1010 fprintf(stderr, "erresc: unknown csi ");
1011 csidump();
1012 /* die(""); */
1013 break;
1014 case '@': /* ICH -- Insert <n> blank char */
1015 DEFAULT(escseq.arg[0], 1);
1016 tinsertblank(escseq.arg[0]);
1017 break;
1018 case 'A': /* CUU -- Cursor <n> Up */
1019 case 'e':
1020 DEFAULT(escseq.arg[0], 1);
1021 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
1022 break;
1023 case 'B': /* CUD -- Cursor <n> Down */
1024 DEFAULT(escseq.arg[0], 1);
1025 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
1026 break;
1027 case 'C': /* CUF -- Cursor <n> Forward */
1028 case 'a':
1029 DEFAULT(escseq.arg[0], 1);
1030 tmoveto(term.c.x+escseq.arg[0], term.c.y);
1031 break;
1032 case 'D': /* CUB -- Cursor <n> Backward */
1033 DEFAULT(escseq.arg[0], 1);
1034 tmoveto(term.c.x-escseq.arg[0], term.c.y);
1035 break;
1036 case 'E': /* CNL -- Cursor <n> Down and first col */
1037 DEFAULT(escseq.arg[0], 1);
1038 tmoveto(0, term.c.y+escseq.arg[0]);
1039 break;
1040 case 'F': /* CPL -- Cursor <n> Up and first col */
1041 DEFAULT(escseq.arg[0], 1);
1042 tmoveto(0, term.c.y-escseq.arg[0]);
1043 break;
1044 case 'G': /* CHA -- Move to <col> */
1045 case '`': /* XXX: HPA -- same? */
1046 DEFAULT(escseq.arg[0], 1);
1047 tmoveto(escseq.arg[0]-1, term.c.y);
1048 break;
1049 case 'H': /* CUP -- Move to <row> <col> */
1050 case 'f': /* XXX: HVP -- same? */
1051 DEFAULT(escseq.arg[0], 1);
1052 DEFAULT(escseq.arg[1], 1);
1053 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
1054 break;
1055 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
1056 case 'J': /* ED -- Clear screen */
1057 switch(escseq.arg[0]) {
1058 case 0: /* below */
1059 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1060 if(term.c.y < term.row-1)
1061 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1062 break;
1063 case 1: /* above */
1064 if(term.c.y > 1)
1065 tclearregion(0, 0, term.col-1, term.c.y-1);
1066 tclearregion(0, term.c.y, term.c.x, term.c.y);
1067 break;
1068 case 2: /* all */
1069 tclearregion(0, 0, term.col-1, term.row-1);
1070 break;
1071 default:
1072 goto unknown;
1073 }
1074 break;
1075 case 'K': /* EL -- Clear line */
1076 switch(escseq.arg[0]) {
1077 case 0: /* right */
1078 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1079 break;
1080 case 1: /* left */
1081 tclearregion(0, term.c.y, term.c.x, term.c.y);
1082 break;
1083 case 2: /* all */
1084 tclearregion(0, term.c.y, term.col-1, term.c.y);
1085 break;
1086 }
1087 break;
1088 case 'S': /* SU -- Scroll <n> line up */
1089 DEFAULT(escseq.arg[0], 1);
1090 tscrollup(term.top, escseq.arg[0]);
1091 break;
1092 case 'T': /* SD -- Scroll <n> line down */
1093 DEFAULT(escseq.arg[0], 1);
1094 tscrolldown(term.top, escseq.arg[0]);
1095 break;
1096 case 'L': /* IL -- Insert <n> blank lines */
1097 DEFAULT(escseq.arg[0], 1);
1098 tinsertblankline(escseq.arg[0]);
1099 break;
1100 case 'l': /* RM -- Reset Mode */
1101 if(escseq.priv) {
1102 switch(escseq.arg[0]) {
1103 case 1:
1104 term.mode &= ~MODE_APPKEYPAD;
1105 break;
1106 case 5: /* DECSCNM -- Remove reverse video */
1107 if(IS_SET(MODE_REVERSE)) {
1108 term.mode &= ~MODE_REVERSE;
1109 draw();
1110 }
1111 break;
1112 case 7:
1113 term.mode &= ~MODE_WRAP;
1114 break;
1115 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1116 break;
1117 case 20:
1118 term.mode &= ~MODE_CRLF;
1119 break;
1120 case 25:
1121 term.c.state |= CURSOR_HIDE;
1122 break;
1123 case 1000: /* disable X11 xterm mouse reporting */
1124 term.mode &= ~MODE_MOUSE;
1125 break;
1126 case 1049: /* = 1047 and 1048 */
1127 case 1047:
1128 if(IS_SET(MODE_ALTSCREEN)) {
1129 tclearregion(0, 0, term.col-1, term.row-1);
1130 tswapscreen();
1131 }
1132 if(escseq.arg[0] == 1047)
1133 break;
1134 case 1048:
1135 tcursor(CURSOR_LOAD);
1136 break;
1137 default:
1138 goto unknown;
1139 }
1140 } else {
1141 switch(escseq.arg[0]) {
1142 case 4:
1143 term.mode &= ~MODE_INSERT;
1144 break;
1145 default:
1146 goto unknown;
1147 }
1148 }
1149 break;
1150 case 'M': /* DL -- Delete <n> lines */
1151 DEFAULT(escseq.arg[0], 1);
1152 tdeleteline(escseq.arg[0]);
1153 break;
1154 case 'X': /* ECH -- Erase <n> char */
1155 DEFAULT(escseq.arg[0], 1);
1156 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1157 break;
1158 case 'P': /* DCH -- Delete <n> char */
1159 DEFAULT(escseq.arg[0], 1);
1160 tdeletechar(escseq.arg[0]);
1161 break;
1162 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1163 case 'd': /* VPA -- Move to <row> */
1164 DEFAULT(escseq.arg[0], 1);
1165 tmoveto(term.c.x, escseq.arg[0]-1);
1166 break;
1167 case 'h': /* SM -- Set terminal mode */
1168 if(escseq.priv) {
1169 switch(escseq.arg[0]) {
1170 case 1:
1171 term.mode |= MODE_APPKEYPAD;
1172 break;
1173 case 5: /* DECSCNM -- Reverve video */
1174 if(!IS_SET(MODE_REVERSE)) {
1175 term.mode |= MODE_REVERSE;
1176 draw();
1177 }
1178 break;
1179 case 7:
1180 term.mode |= MODE_WRAP;
1181 break;
1182 case 20:
1183 term.mode |= MODE_CRLF;
1184 break;
1185 case 12: /* att610 -- Start blinking cursor (IGNORED) */
1186 /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1187 if(escseq.narg > 1 && escseq.arg[1] != 25)
1188 break;
1189 case 25:
1190 term.c.state &= ~CURSOR_HIDE;
1191 break;
1192 case 1000: /* enable X11 xterm mouse reporting */
1193 term.mode |= MODE_MOUSE;
1194 break;
1195 case 1049: /* = 1047 and 1048 */
1196 case 1047:
1197 if(IS_SET(MODE_ALTSCREEN))
1198 tclearregion(0, 0, term.col-1, term.row-1);
1199 else
1200 tswapscreen();
1201 if(escseq.arg[0] == 1047)
1202 break;
1203 case 1048:
1204 tcursor(CURSOR_SAVE);
1205 break;
1206 default: goto unknown;
1207 }
1208 } else {
1209 switch(escseq.arg[0]) {
1210 case 4:
1211 term.mode |= MODE_INSERT;
1212 break;
1213 default: goto unknown;
1214 }
1215 };
1216 break;
1217 case 'm': /* SGR -- Terminal attribute (color) */
1218 tsetattr(escseq.arg, escseq.narg);
1219 break;
1220 case 'r': /* DECSTBM -- Set Scrolling Region */
1221 if(escseq.priv)
1222 goto unknown;
1223 else {
1224 DEFAULT(escseq.arg[0], 1);
1225 DEFAULT(escseq.arg[1], term.row);
1226 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1227 tmoveto(0, 0);
1228 }
1229 break;
1230 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1231 tcursor(CURSOR_SAVE);
1232 break;
1233 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1234 tcursor(CURSOR_LOAD);
1235 break;
1236 }
1237 }
1238
1239 void
1240 csidump(void) {
1241 int i;
1242 printf("ESC [ %s", escseq.priv ? "? " : "");
1243 if(escseq.narg)
1244 for(i = 0; i < escseq.narg; i++)
1245 printf("%d ", escseq.arg[i]);
1246 if(escseq.mode)
1247 putchar(escseq.mode);
1248 putchar('\n');
1249 }
1250
1251 void
1252 csireset(void) {
1253 memset(&escseq, 0, sizeof(escseq));
1254 }
1255
1256 void
1257 tputtab(void) {
1258 int space = TAB - term.c.x % TAB;
1259 tmoveto(term.c.x + space, term.c.y);
1260 }
1261
1262 void
1263 tputc(char *c) {
1264 char ascii = *c;
1265 if(term.esc & ESC_START) {
1266 if(term.esc & ESC_CSI) {
1267 escseq.buf[escseq.len++] = ascii;
1268 if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1269 term.esc = 0;
1270 csiparse(), csihandle();
1271 }
1272 /* TODO: handle other OSC */
1273 } else if(term.esc & ESC_OSC) {
1274 if(ascii == ';') {
1275 term.titlelen = 0;
1276 term.esc = ESC_START | ESC_TITLE;
1277 }
1278 } else if(term.esc & ESC_TITLE) {
1279 if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1280 term.esc = 0;
1281 term.title[term.titlelen] = '\0';
1282 XStoreName(xw.dpy, xw.win, term.title);
1283 } else {
1284 term.title[term.titlelen++] = ascii;
1285 }
1286 } else if(term.esc & ESC_ALTCHARSET) {
1287 switch(ascii) {
1288 case '0': /* Line drawing crap */
1289 term.c.attr.mode |= ATTR_GFX;
1290 break;
1291 case 'B': /* Back to regular text */
1292 term.c.attr.mode &= ~ATTR_GFX;
1293 break;
1294 default:
1295 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1296 }
1297 term.esc = 0;
1298 } else {
1299 switch(ascii) {
1300 case '[':
1301 term.esc |= ESC_CSI;
1302 break;
1303 case ']':
1304 term.esc |= ESC_OSC;
1305 break;
1306 case '(':
1307 term.esc |= ESC_ALTCHARSET;
1308 break;
1309 case 'D': /* IND -- Linefeed */
1310 if(term.c.y == term.bot)
1311 tscrollup(term.top, 1);
1312 else
1313 tmoveto(term.c.x, term.c.y+1);
1314 term.esc = 0;
1315 break;
1316 case 'E': /* NEL -- Next line */
1317 tnewline(1); /* always go to first col */
1318 term.esc = 0;
1319 break;
1320 case 'M': /* RI -- Reverse index */
1321 if(term.c.y == term.top)
1322 tscrolldown(term.top, 1);
1323 else
1324 tmoveto(term.c.x, term.c.y-1);
1325 term.esc = 0;
1326 break;
1327 case 'c': /* RIS -- Reset to inital state */
1328 treset();
1329 term.esc = 0;
1330 break;
1331 case '=': /* DECPAM -- Application keypad */
1332 term.mode |= MODE_APPKEYPAD;
1333 term.esc = 0;
1334 break;
1335 case '>': /* DECPNM -- Normal keypad */
1336 term.mode &= ~MODE_APPKEYPAD;
1337 term.esc = 0;
1338 break;
1339 case '7': /* DECSC -- Save Cursor */
1340 tcursor(CURSOR_SAVE);
1341 term.esc = 0;
1342 break;
1343 case '8': /* DECRC -- Restore Cursor */
1344 tcursor(CURSOR_LOAD);
1345 term.esc = 0;
1346 break;
1347 default:
1348 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1349 (unsigned char) ascii, isprint(ascii)?ascii:'.');
1350 term.esc = 0;
1351 }
1352 }
1353 } else {
1354 switch(ascii) {
1355 case '\t':
1356 tputtab();
1357 break;
1358 case '\b':
1359 tmoveto(term.c.x-1, term.c.y);
1360 break;
1361 case '\r':
1362 tmoveto(0, term.c.y);
1363 break;
1364 case '\f':
1365 case '\v':
1366 case '\n':
1367 /* go to first col if the mode is set */
1368 tnewline(IS_SET(MODE_CRLF));
1369 break;
1370 case '\a':
1371 if(!(xw.state & WIN_FOCUSED))
1372 xseturgency(1);
1373 break;
1374 case '\033':
1375 csireset();
1376 term.esc = ESC_START;
1377 break;
1378 default:
1379 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1380 tnewline(1); /* always go to first col */
1381 tsetchar(c);
1382 if(term.c.x+1 < term.col)
1383 tmoveto(term.c.x+1, term.c.y);
1384 else
1385 term.c.state |= CURSOR_WRAPNEXT;
1386 }
1387 }
1388 }
1389
1390 int
1391 tresize(int col, int row) {
1392 int i, x;
1393 int minrow = MIN(row, term.row);
1394 int mincol = MIN(col, term.col);
1395 int slide = term.c.y - row + 1;
1396
1397 if(col < 1 || row < 1)
1398 return 0;
1399
1400 /* free unneeded rows */
1401 i = 0;
1402 if(slide > 0) {
1403 /* slide screen to keep cursor where we expect it -
1404 * tscrollup would work here, but we can optimize to
1405 * memmove because we're freeing the earlier lines */
1406 for(/* i = 0 */; i < slide; i++) {
1407 free(term.line[i]);
1408 free(term.alt[i]);
1409 }
1410 memmove(term.line, term.line + slide, row * sizeof(Line));
1411 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1412 }
1413 for(i += row; i < term.row; i++) {
1414 free(term.line[i]);
1415 free(term.alt[i]);
1416 }
1417
1418 /* resize to new height */
1419 term.line = realloc(term.line, row * sizeof(Line));
1420 term.alt = realloc(term.alt, row * sizeof(Line));
1421
1422 /* resize each row to new width, zero-pad if needed */
1423 for(i = 0; i < minrow; i++) {
1424 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1425 term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
1426 for(x = mincol; x < col; x++) {
1427 term.line[i][x].state = 0;
1428 term.alt[i][x].state = 0;
1429 }
1430 }
1431
1432 /* allocate any new rows */
1433 for(/* i == minrow */; i < row; i++) {
1434 term.line[i] = calloc(col, sizeof(Glyph));
1435 term.alt [i] = calloc(col, sizeof(Glyph));
1436 }
1437
1438 /* update terminal size */
1439 term.col = col, term.row = row;
1440 /* make use of the LIMIT in tmoveto */
1441 tmoveto(term.c.x, term.c.y);
1442 /* reset scrolling region */
1443 tsetscroll(0, row-1);
1444 return (slide > 0);
1445 }
1446
1447 void
1448 xresize(int col, int row) {
1449 Pixmap newbuf;
1450 int oldw, oldh;
1451
1452 oldw = xw.bufw;
1453 oldh = xw.bufh;
1454 xw.bufw = MAX(1, col * xw.cw);
1455 xw.bufh = MAX(1, row * xw.ch);
1456 newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1457 XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1458 XFreePixmap(xw.dpy, xw.buf);
1459 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1460 if(xw.bufw > oldw)
1461 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1462 xw.bufw-oldw, MIN(xw.bufh, oldh));
1463 else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1464 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1465 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1466 False);
1467 if(xw.bufh > oldh)
1468 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1469 xw.bufw, xw.bufh-oldh);
1470 else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1471 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1472 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1473 False);
1474 xw.buf = newbuf;
1475 }
1476
1477 void
1478 xloadcols(void) {
1479 int i, r, g, b;
1480 XColor color;
1481 unsigned long white = WhitePixel(xw.dpy, xw.scr);
1482
1483 for(i = 0; i < 16; i++) {
1484 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1485 dc.col[i] = white;
1486 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1487 } else
1488 dc.col[i] = color.pixel;
1489 }
1490
1491 /* same colors as xterm */
1492 for(r = 0; r < 6; r++)
1493 for(g = 0; g < 6; g++)
1494 for(b = 0; b < 6; b++) {
1495 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1496 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1497 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1498 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1499 dc.col[i] = white;
1500 fprintf(stderr, "Could not allocate color %d\n", i);
1501 } else
1502 dc.col[i] = color.pixel;
1503 i++;
1504 }
1505
1506 for(r = 0; r < 24; r++, i++) {
1507 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1508 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1509 dc.col[i] = white;
1510 fprintf(stderr, "Could not allocate color %d\n", i);
1511 } else
1512 dc.col[i] = color.pixel;
1513 }
1514 }
1515
1516 void
1517 xclear(int x1, int y1, int x2, int y2) {
1518 XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1519 XFillRectangle(xw.dpy, xw.buf, dc.gc,
1520 x1 * xw.cw, y1 * xw.ch,
1521 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1522 }
1523
1524 void
1525 xhints(void) {
1526 XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1527 XWMHints wm = {.flags = InputHint, .input = 1};
1528 XSizeHints size = {
1529 .flags = PSize | PResizeInc | PBaseSize,
1530 .height = xw.h,
1531 .width = xw.w,
1532 .height_inc = xw.ch,
1533 .width_inc = xw.cw,
1534 .base_height = 2*BORDER,
1535 .base_width = 2*BORDER,
1536 };
1537 XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1538 }
1539
1540 XFontSet
1541 xinitfont(char *fontstr) {
1542 XFontSet set;
1543 char *def, **missing;
1544 int n;
1545
1546 missing = NULL;
1547 set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1548 if(missing) {
1549 while(n--)
1550 fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1551 XFreeStringList(missing);
1552 }
1553 return set;
1554 }
1555
1556 void
1557 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1558 XFontStruct **xfonts;
1559 char **font_names;
1560 int i, n;
1561
1562 *ascent = *descent = *lbearing = *rbearing = 0;
1563 n = XFontsOfFontSet(set, &xfonts, &font_names);
1564 for(i = 0; i < n; i++) {
1565 *ascent = MAX(*ascent, (*xfonts)->ascent);
1566 *descent = MAX(*descent, (*xfonts)->descent);
1567 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1568 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1569 xfonts++;
1570 }
1571 }
1572
1573 void
1574 initfonts(char *fontstr, char *bfontstr) {
1575 if((dc.font.set = xinitfont(fontstr)) == NULL ||
1576 (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1577 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1578 xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1579 &dc.font.lbearing, &dc.font.rbearing);
1580 xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1581 &dc.bfont.lbearing, &dc.bfont.rbearing);
1582 }
1583
1584 void
1585 xinit(void) {
1586 XSetWindowAttributes attrs;
1587 Cursor cursor;
1588
1589 if(!(xw.dpy = XOpenDisplay(NULL)))
1590 die("Can't open display\n");
1591 xw.scr = XDefaultScreen(xw.dpy);
1592
1593 /* font */
1594 initfonts(FONT, BOLDFONT);
1595
1596 /* XXX: Assuming same size for bold font */
1597 xw.cw = dc.font.rbearing - dc.font.lbearing;
1598 xw.ch = dc.font.ascent + dc.font.descent;
1599
1600 /* colors */
1601 xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1602 xloadcols();
1603
1604 /* window - default size */
1605 xw.bufh = 24 * xw.ch;
1606 xw.bufw = 80 * xw.cw;
1607 xw.h = xw.bufh + 2*BORDER;
1608 xw.w = xw.bufw + 2*BORDER;
1609
1610 attrs.background_pixel = dc.col[DefaultBG];
1611 attrs.border_pixel = dc.col[DefaultBG];
1612 attrs.bit_gravity = NorthWestGravity;
1613 attrs.event_mask = FocusChangeMask | KeyPressMask
1614 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1615 | PointerMotionMask | ButtonPressMask | ButtonReleaseMask;
1616 attrs.colormap = xw.cmap;
1617
1618 xw.win = XCreateWindow(xw.dpy, XRootWindow(xw.dpy, xw.scr), 0, 0,
1619 xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1620 XDefaultVisual(xw.dpy, xw.scr),
1621 CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1622 | CWColormap,
1623 &attrs);
1624 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1625
1626
1627 /* input methods */
1628 xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1629 xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1630 | XIMStatusNothing, XNClientWindow, xw.win,
1631 XNFocusWindow, xw.win, NULL);
1632 /* gc */
1633 dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1634
1635 /* white cursor, black outline */
1636 cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1637 XDefineCursor(xw.dpy, xw.win, cursor);
1638 XRecolorCursor(xw.dpy, cursor,
1639 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1640 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1641
1642 XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1643 XMapWindow(xw.dpy, xw.win);
1644 xhints();
1645 XSync(xw.dpy, 0);
1646 }
1647
1648 void
1649 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1650 unsigned long xfg = dc.col[base.fg], xbg = dc.col[base.bg], temp;
1651 int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1652 int i;
1653
1654 /* only switch default fg/bg if term is in RV mode */
1655 if(IS_SET(MODE_REVERSE)) {
1656 if(base.fg == DefaultFG)
1657 xfg = dc.col[DefaultBG];
1658 if(base.bg == DefaultBG)
1659 xbg = dc.col[DefaultFG];
1660 }
1661
1662 if(base.mode & ATTR_REVERSE)
1663 temp = xfg, xfg = xbg, xbg = temp;
1664
1665 XSetBackground(xw.dpy, dc.gc, xbg);
1666 XSetForeground(xw.dpy, dc.gc, xfg);
1667
1668 if(base.mode & ATTR_GFX) {
1669 for(i = 0; i < bytelen; i++) {
1670 char c = gfx[(unsigned int)s[i] % 256];
1671 if(c)
1672 s[i] = c;
1673 else if(s[i] > 0x5f)
1674 s[i] -= 0x5f;
1675 }
1676 }
1677
1678 XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1679 dc.gc, winx, winy, s, bytelen);
1680
1681 if(base.mode & ATTR_UNDERLINE)
1682 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1683 }
1684
1685 void
1686 xdrawcursor(void) {
1687 static int oldx = 0;
1688 static int oldy = 0;
1689 int sl;
1690 Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1691
1692 LIMIT(oldx, 0, term.col-1);
1693 LIMIT(oldy, 0, term.row-1);
1694
1695 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1696 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1697
1698 /* remove the old cursor */
1699 if(term.line[oldy][oldx].state & GLYPH_SET) {
1700 sl = utf8size(term.line[oldy][oldx].c);
1701 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1702 } else
1703 xclear(oldx, oldy, oldx, oldy);
1704
1705 /* draw the new one */
1706 if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1707 sl = utf8size(g.c);
1708 if(IS_SET(MODE_REVERSE))
1709 g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
1710 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1711 oldx = term.c.x, oldy = term.c.y;
1712 }
1713 }
1714
1715 void
1716 draw() {
1717 drawregion(0, 0, term.col, term.row);
1718 }
1719
1720 void
1721 drawregion(int x1, int y1, int x2, int y2) {
1722 int ic, ib, x, y, ox, sl;
1723 Glyph base, new;
1724 char buf[DRAW_BUF_SIZ];
1725
1726 if(!(xw.state & WIN_VISIBLE))
1727 return;
1728
1729 xclear(x1, y1, x2-1, y2-1);
1730 for(y = y1; y < y2; y++) {
1731 base = term.line[y][0];
1732 ic = ib = ox = 0;
1733 for(x = x1; x < x2; x++) {
1734 new = term.line[y][x];
1735 if(sel.bx != -1 && *(new.c) && selected(x, y))
1736 new.mode ^= ATTR_REVERSE;
1737 if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1738 ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1739 xdraws(buf, base, ox, y, ic, ib);
1740 ic = ib = 0;
1741 }
1742 if(new.state & GLYPH_SET) {
1743 if(ib == 0) {
1744 ox = x;
1745 base = new;
1746 }
1747 sl = utf8size(new.c);
1748 memcpy(buf+ib, new.c, sl);
1749 ib += sl;
1750 ++ic;
1751 }
1752 }
1753 if(ib > 0)
1754 xdraws(buf, base, ox, y, ic, ib);
1755 }
1756 xdrawcursor();
1757 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1758 }
1759
1760 void
1761 expose(XEvent *ev) {
1762 XExposeEvent *e = &ev->xexpose;
1763 if(xw.state & WIN_REDRAW) {
1764 if(!e->count) {
1765 xw.state &= ~WIN_REDRAW;
1766 draw();
1767 }
1768 } else
1769 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1770 e->width, e->height, e->x, e->y);
1771 }
1772
1773 void
1774 visibility(XEvent *ev) {
1775 XVisibilityEvent *e = &ev->xvisibility;
1776 if(e->state == VisibilityFullyObscured)
1777 xw.state &= ~WIN_VISIBLE;
1778 else if(!(xw.state & WIN_VISIBLE))
1779 /* need a full redraw for next Expose, not just a buf copy */
1780 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1781 }
1782
1783 void
1784 unmap(XEvent *ev) {
1785 xw.state &= ~WIN_VISIBLE;
1786 }
1787
1788 void
1789 xseturgency(int add) {
1790 XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1791 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1792 XSetWMHints(xw.dpy, xw.win, h);
1793 XFree(h);
1794 }
1795
1796 void
1797 focus(XEvent *ev) {
1798 if(ev->type == FocusIn) {
1799 xw.state |= WIN_FOCUSED;
1800 xseturgency(0);
1801 } else
1802 xw.state &= ~WIN_FOCUSED;
1803 draw();
1804 }
1805
1806 char*
1807 kmap(KeySym k, unsigned int state) {
1808 int i;
1809 for(i = 0; i < LEN(key); i++)
1810 if(key[i].k == k && (key[i].mask == 0 || key[i].mask & state))
1811 return (char*)key[i].s;
1812 return NULL;
1813 }
1814
1815 void
1816 kpress(XEvent *ev) {
1817 XKeyEvent *e = &ev->xkey;
1818 KeySym ksym;
1819 char buf[32];
1820 char *customkey;
1821 int len;
1822 int meta;
1823 int shift;
1824 Status status;
1825
1826 meta = e->state & Mod1Mask;
1827 shift = e->state & ShiftMask;
1828 len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1829
1830 /* 1. custom keys from config.h */
1831 if((customkey = kmap(ksym, e->state)))
1832 ttywrite(customkey, strlen(customkey));
1833 /* 2. hardcoded (overrides X lookup) */
1834 else
1835 switch(ksym) {
1836 case XK_Up:
1837 case XK_Down:
1838 case XK_Left:
1839 case XK_Right:
1840 /* XXX: shift up/down doesn't work */
1841 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
1842 ttywrite(buf, 3);
1843 break;
1844 case XK_Insert:
1845 if(shift)
1846 selpaste();
1847 break;
1848 case XK_Return:
1849 if(IS_SET(MODE_CRLF))
1850 ttywrite("\r\n", 2);
1851 else
1852 ttywrite("\r", 1);
1853 break;
1854 /* 3. X lookup */
1855 default:
1856 if(len > 0) {
1857 if(meta && len == 1)
1858 ttywrite("\033", 1);
1859 ttywrite(buf, len);
1860 }
1861 break;
1862 }
1863 }
1864
1865 void
1866 resize(XEvent *e) {
1867 int col, row;
1868
1869 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1870 return;
1871
1872 xw.w = e->xconfigure.width;
1873 xw.h = e->xconfigure.height;
1874 col = (xw.w - 2*BORDER) / xw.cw;
1875 row = (xw.h - 2*BORDER) / xw.ch;
1876 if(col == term.col && row == term.row)
1877 return;
1878 if(tresize(col, row))
1879 draw();
1880 ttyresize(col, row);
1881 xresize(col, row);
1882 }
1883
1884 void
1885 run(void) {
1886 XEvent ev;
1887 fd_set rfd;
1888 int xfd = XConnectionNumber(xw.dpy);
1889
1890 for(;;) {
1891 FD_ZERO(&rfd);
1892 FD_SET(cmdfd, &rfd);
1893 FD_SET(xfd, &rfd);
1894 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1895 if(errno == EINTR)
1896 continue;
1897 die("select failed: %s\n", SERRNO);
1898 }
1899 if(FD_ISSET(cmdfd, &rfd)) {
1900 ttyread();
1901 draw();
1902 }
1903 while(XPending(xw.dpy)) {
1904 XNextEvent(xw.dpy, &ev);
1905 if(XFilterEvent(&ev, xw.win))
1906 continue;
1907 if(handler[ev.type])
1908 (handler[ev.type])(&ev);
1909 }
1910 }
1911 }
1912
1913 int
1914 main(int argc, char *argv[]) {
1915 int i;
1916
1917 for(i = 1; i < argc; i++) {
1918 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1919 case 't':
1920 if(++i < argc) opt_title = argv[i];
1921 break;
1922 case 'c':
1923 if(++i < argc) opt_class = argv[i];
1924 break;
1925 case 'e':
1926 /* eat every remaining arguments */
1927 if(++i < argc) opt_cmd = &argv[i];
1928 goto run;
1929 case 'v':
1930 default:
1931 die(USAGE);
1932 }
1933 }
1934
1935 run:
1936 setlocale(LC_CTYPE, "");
1937 tnew(80, 24);
1938 ttynew();
1939 xinit();
1940 selinit();
1941 run();
1942 return 0;
1943 }