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tweak focus to support XEMBED client message and remove focus on EnterNotify. (thx...
[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] [-w windowid] [-v] [-e command...]\n"
39
40 /* XEMBED messages */
41 #define XEMBED_FOCUS_IN 4
42 #define XEMBED_FOCUS_OUT 5
43
44 /* Arbitrary sizes */
45 #define ESC_TITLE_SIZ 256
46 #define ESC_BUF_SIZ 256
47 #define ESC_ARG_SIZ 16
48 #define DRAW_BUF_SIZ 1024
49 #define UTF_SIZ 4
50
51 #define SERRNO strerror(errno)
52 #define MIN(a, b) ((a) < (b) ? (a) : (b))
53 #define MAX(a, b) ((a) < (b) ? (b) : (a))
54 #define LEN(a) (sizeof(a) / sizeof(a[0]))
55 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
56 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
57 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
58 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
59 #define IS_SET(flag) (term.mode & (flag))
60 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
61 #define X2COL(x) (((x) - BORDER)/xw.cw)
62 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
63
64 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
65 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
66 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
67 CURSOR_SAVE, CURSOR_LOAD };
68 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
69 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
70 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
71 MODE_CRLF=16, MODE_MOUSEBTN=32, MODE_MOUSEMOTION=64, MODE_MOUSE=32|64, MODE_REVERSE=128 };
72 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
73 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
74
75 #undef B0
76 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
77
78 typedef struct {
79 char c[UTF_SIZ]; /* character code */
80 char mode; /* attribute flags */
81 int fg; /* foreground */
82 int bg; /* background */
83 char state; /* state flags */
84 } Glyph;
85
86 typedef Glyph* Line;
87
88 typedef struct {
89 Glyph attr; /* current char attributes */
90 int x;
91 int y;
92 char state;
93 } TCursor;
94
95 /* CSI Escape sequence structs */
96 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
97 typedef struct {
98 char buf[ESC_BUF_SIZ]; /* raw string */
99 int len; /* raw string length */
100 char priv;
101 int arg[ESC_ARG_SIZ];
102 int narg; /* nb of args */
103 char mode;
104 } CSIEscape;
105
106 /* Internal representation of the screen */
107 typedef struct {
108 int row; /* nb row */
109 int col; /* nb col */
110 Line* line; /* screen */
111 Line* alt; /* alternate screen */
112 TCursor c; /* cursor */
113 int top; /* top scroll limit */
114 int bot; /* bottom scroll limit */
115 int mode; /* terminal mode flags */
116 int esc; /* escape state flags */
117 char title[ESC_TITLE_SIZ];
118 int titlelen;
119 } Term;
120
121 /* Purely graphic info */
122 typedef struct {
123 Display* dpy;
124 Colormap cmap;
125 Window win;
126 Pixmap buf;
127 XIM xim;
128 XIC xic;
129 int scr;
130 int w; /* window width */
131 int h; /* window height */
132 int bufw; /* pixmap width */
133 int bufh; /* pixmap height */
134 int ch; /* char height */
135 int cw; /* char width */
136 char state; /* focus, redraw, visible */
137 } XWindow;
138
139 typedef struct {
140 KeySym k;
141 unsigned int mask;
142 char s[ESC_BUF_SIZ];
143 } Key;
144
145 /* Drawing Context */
146 typedef struct {
147 unsigned long col[256];
148 GC gc;
149 struct {
150 int ascent;
151 int descent;
152 short lbearing;
153 short rbearing;
154 XFontSet set;
155 } font, bfont;
156 } DC;
157
158 /* TODO: use better name for vars... */
159 typedef struct {
160 int mode;
161 int bx, by;
162 int ex, ey;
163 struct {int x, y;} b, e;
164 char *clip;
165 Atom xtarget;
166 struct timeval tclick1;
167 struct timeval tclick2;
168 } Selection;
169
170 #include "config.h"
171
172 static void die(const char*, ...);
173 static void draw(void);
174 static void drawregion(int, int, int, int);
175 static void execsh(void);
176 static void sigchld(int);
177 static void run(void);
178
179 static void csidump(void);
180 static void csihandle(void);
181 static void csiparse(void);
182 static void csireset(void);
183
184 static void tclearregion(int, int, int, int);
185 static void tcursor(int);
186 static void tdeletechar(int);
187 static void tdeleteline(int);
188 static void tinsertblank(int);
189 static void tinsertblankline(int);
190 static void tmoveto(int, int);
191 static void tnew(int, int);
192 static void tnewline(int);
193 static void tputtab(void);
194 static void tputc(char*);
195 static void treset(void);
196 static int tresize(int, int);
197 static void tscrollup(int, int);
198 static void tscrolldown(int, int);
199 static void tsetattr(int*, int);
200 static void tsetchar(char*);
201 static void tsetscroll(int, int);
202 static void tswapscreen(void);
203
204 static void ttynew(void);
205 static void ttyread(void);
206 static void ttyresize(int, int);
207 static void ttywrite(const char *, size_t);
208
209 static void xdraws(char *, Glyph, int, int, int, int);
210 static void xhints(void);
211 static void xclear(int, int, int, int);
212 static void xdrawcursor(void);
213 static void xinit(void);
214 static void xloadcols(void);
215 static void xseturgency(int);
216 static void xsetsel(char*);
217 static void xresize(int, int);
218
219 static void expose(XEvent *);
220 static void visibility(XEvent *);
221 static void unmap(XEvent *);
222 static char* kmap(KeySym, unsigned int state);
223 static void kpress(XEvent *);
224 static void cmessage(XEvent *);
225 static void resize(XEvent *);
226 static void focus(XEvent *);
227 static void brelease(XEvent *);
228 static void bpress(XEvent *);
229 static void bmotion(XEvent *);
230 static void selnotify(XEvent *);
231 static void selrequest(XEvent *);
232
233 static void selinit(void);
234 static inline int selected(int, int);
235 static void selcopy(void);
236 static void selpaste();
237
238 static int utf8decode(char *, long *);
239 static int utf8encode(long *, char *);
240 static int utf8size(char *);
241 static int isfullutf8(char *, int);
242
243 static void (*handler[LASTEvent])(XEvent *) = {
244 [KeyPress] = kpress,
245 [ClientMessage] = cmessage,
246 [ConfigureNotify] = resize,
247 [VisibilityNotify] = visibility,
248 [UnmapNotify] = unmap,
249 [Expose] = expose,
250 [FocusIn] = focus,
251 [FocusOut] = focus,
252 [MotionNotify] = bmotion,
253 [ButtonPress] = bpress,
254 [ButtonRelease] = brelease,
255 [SelectionNotify] = selnotify,
256 [SelectionRequest] = selrequest,
257 };
258
259 /* Globals */
260 static DC dc;
261 static XWindow xw;
262 static Term term;
263 static CSIEscape escseq;
264 static int cmdfd;
265 static pid_t pid;
266 static Selection sel;
267 static char **opt_cmd = NULL;
268 static char *opt_title = NULL;
269 static char *opt_embed = NULL;
270 static char *opt_class = NULL;
271 static Atom xembedatom;
272
273 int
274 utf8decode(char *s, long *u) {
275 unsigned char c;
276 int i, n, rtn;
277
278 rtn = 1;
279 c = *s;
280 if(~c&B7) { /* 0xxxxxxx */
281 *u = c;
282 return rtn;
283 } else if((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
284 *u = c&(B4|B3|B2|B1|B0);
285 n = 1;
286 } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
287 *u = c&(B3|B2|B1|B0);
288 n = 2;
289 } else if((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
290 *u = c&(B2|B1|B0);
291 n = 3;
292 } else
293 goto invalid;
294 for(i=n,++s; i>0; --i,++rtn,++s) {
295 c = *s;
296 if((c&(B7|B6)) != B7) /* 10xxxxxx */
297 goto invalid;
298 *u <<= 6;
299 *u |= c&(B5|B4|B3|B2|B1|B0);
300 }
301 if((n == 1 && *u < 0x80) ||
302 (n == 2 && *u < 0x800) ||
303 (n == 3 && *u < 0x10000) ||
304 (*u >= 0xD800 && *u <= 0xDFFF))
305 goto invalid;
306 return rtn;
307 invalid:
308 *u = 0xFFFD;
309 return rtn;
310 }
311
312 int
313 utf8encode(long *u, char *s) {
314 unsigned char *sp;
315 unsigned long uc;
316 int i, n;
317
318 sp = (unsigned char*) s;
319 uc = *u;
320 if(uc < 0x80) {
321 *sp = uc; /* 0xxxxxxx */
322 return 1;
323 } else if(*u < 0x800) {
324 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
325 n = 1;
326 } else if(uc < 0x10000) {
327 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
328 n = 2;
329 } else if(uc <= 0x10FFFF) {
330 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
331 n = 3;
332 } else {
333 goto invalid;
334 }
335 for(i=n,++sp; i>0; --i,++sp)
336 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
337 return n+1;
338 invalid:
339 /* U+FFFD */
340 *s++ = '\xEF';
341 *s++ = '\xBF';
342 *s = '\xBD';
343 return 3;
344 }
345
346 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
347 UTF-8 otherwise return 0 */
348 int
349 isfullutf8(char *s, int b) {
350 unsigned char *c1, *c2, *c3;
351
352 c1 = (unsigned char *) s;
353 c2 = (unsigned char *) ++s;
354 c3 = (unsigned char *) ++s;
355 if(b < 1)
356 return 0;
357 else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
358 return 0;
359 else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
360 ((b == 1) ||
361 ((b == 2) && (*c2&(B7|B6)) == B7)))
362 return 0;
363 else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
364 ((b == 1) ||
365 ((b == 2) && (*c2&(B7|B6)) == B7) ||
366 ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
367 return 0;
368 else
369 return 1;
370 }
371
372 int
373 utf8size(char *s) {
374 unsigned char c = *s;
375
376 if(~c&B7)
377 return 1;
378 else if((c&(B7|B6|B5)) == (B7|B6))
379 return 2;
380 else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
381 return 3;
382 else
383 return 4;
384 }
385
386 void
387 selinit(void) {
388 sel.tclick1.tv_sec = 0;
389 sel.tclick1.tv_usec = 0;
390 sel.mode = 0;
391 sel.bx = -1;
392 sel.clip = NULL;
393 sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
394 if(sel.xtarget == None)
395 sel.xtarget = XA_STRING;
396 }
397
398 static inline int
399 selected(int x, int y) {
400 if(sel.ey == y && sel.by == y) {
401 int bx = MIN(sel.bx, sel.ex);
402 int ex = MAX(sel.bx, sel.ex);
403 return BETWEEN(x, bx, ex);
404 }
405 return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
406 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
407 }
408
409 void
410 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
411 if(b)
412 *b = e->xbutton.button;
413
414 *x = X2COL(e->xbutton.x);
415 *y = Y2ROW(e->xbutton.y);
416 sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
417 sel.b.y = MIN(sel.by, sel.ey);
418 sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
419 sel.e.y = MAX(sel.by, sel.ey);
420 }
421
422 void
423 mousereport(XEvent *e) {
424 int x = X2COL(e->xbutton.x);
425 int y = Y2ROW(e->xbutton.y);
426 int button = e->xbutton.button;
427 int state = e->xbutton.state;
428 char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
429 static int ob, ox, oy;
430
431 /* from urxvt */
432 if(e->xbutton.type == MotionNotify) {
433 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
434 return;
435 button = ob + 32;
436 ox = x, oy = y;
437 } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
438 button = 3;
439 } else {
440 button -= Button1;
441 if(button >= 3)
442 button += 64 - 3;
443 if(e->xbutton.type == ButtonPress) {
444 ob = button;
445 ox = x, oy = y;
446 }
447 }
448
449 buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
450 + (state & Mod4Mask ? 8 : 0)
451 + (state & ControlMask ? 16 : 0);
452
453 ttywrite(buf, sizeof(buf));
454 }
455
456 void
457 bpress(XEvent *e) {
458 if(IS_SET(MODE_MOUSE))
459 mousereport(e);
460 else if(e->xbutton.button == Button1) {
461 sel.mode = 1;
462 sel.ex = sel.bx = X2COL(e->xbutton.x);
463 sel.ey = sel.by = Y2ROW(e->xbutton.y);
464 }
465 }
466
467 void
468 selcopy(void) {
469 char *str, *ptr;
470 int x, y, sz, sl, ls = 0;
471
472 if(sel.bx == -1)
473 str = NULL;
474 else {
475 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
476 ptr = str = malloc(sz);
477 for(y = 0; y < term.row; y++) {
478 for(x = 0; x < term.col; x++)
479 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
480 sl = utf8size(term.line[y][x].c);
481 memcpy(ptr, term.line[y][x].c, sl);
482 ptr += sl;
483 }
484 if(ls && y < sel.e.y)
485 *ptr++ = '\n';
486 }
487 *ptr = 0;
488 }
489 xsetsel(str);
490 }
491
492 void
493 selnotify(XEvent *e) {
494 unsigned long nitems, ofs, rem;
495 int format;
496 unsigned char *data;
497 Atom type;
498
499 ofs = 0;
500 do {
501 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
502 False, AnyPropertyType, &type, &format,
503 &nitems, &rem, &data)) {
504 fprintf(stderr, "Clipboard allocation failed\n");
505 return;
506 }
507 ttywrite((const char *) data, nitems * format / 8);
508 XFree(data);
509 /* number of 32-bit chunks returned */
510 ofs += nitems * format / 32;
511 } while(rem > 0);
512 }
513
514 void
515 selpaste() {
516 XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
517 }
518
519 void
520 selrequest(XEvent *e) {
521 XSelectionRequestEvent *xsre;
522 XSelectionEvent xev;
523 Atom xa_targets;
524
525 xsre = (XSelectionRequestEvent *) e;
526 xev.type = SelectionNotify;
527 xev.requestor = xsre->requestor;
528 xev.selection = xsre->selection;
529 xev.target = xsre->target;
530 xev.time = xsre->time;
531 /* reject */
532 xev.property = None;
533
534 xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
535 if(xsre->target == xa_targets) {
536 /* respond with the supported type */
537 Atom string = sel.xtarget;
538 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
539 XA_ATOM, 32, PropModeReplace,
540 (unsigned char *) &string, 1);
541 xev.property = xsre->property;
542 } else if(xsre->target == sel.xtarget) {
543 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
544 xsre->target, 8, PropModeReplace,
545 (unsigned char *) sel.clip, strlen(sel.clip));
546 xev.property = xsre->property;
547 }
548
549 /* all done, send a notification to the listener */
550 if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
551 fprintf(stderr, "Error sending SelectionNotify event\n");
552 }
553
554 void
555 xsetsel(char *str) {
556 /* register the selection for both the clipboard and the primary */
557 Atom clipboard;
558
559 free(sel.clip);
560 sel.clip = str;
561
562 XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
563
564 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
565 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
566
567 XFlush(xw.dpy);
568 }
569
570 void
571 brelease(XEvent *e) {
572 if(IS_SET(MODE_MOUSE)) {
573 mousereport(e);
574 return;
575 }
576 if(e->xbutton.button == Button2)
577 selpaste();
578 else if(e->xbutton.button == Button1) {
579 sel.mode = 0;
580 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
581 if(sel.bx == sel.ex && sel.by == sel.ey) {
582 struct timeval now;
583 sel.bx = -1;
584 gettimeofday(&now, NULL);
585
586 if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
587 /* triple click on the line */
588 sel.b.x = sel.bx = 0;
589 sel.e.x = sel.ex = term.col;
590 sel.b.y = sel.e.y = sel.ey;
591 selcopy();
592 } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
593 /* double click to select word */
594 sel.bx = sel.ex;
595 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
596 term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
597 sel.b.x = sel.bx;
598 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
599 term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
600 sel.e.x = sel.ex;
601 sel.b.y = sel.e.y = sel.ey;
602 selcopy();
603 }
604 } else
605 selcopy();
606 }
607 memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
608 gettimeofday(&sel.tclick1, NULL);
609 draw();
610 }
611
612 void
613 bmotion(XEvent *e) {
614 if(IS_SET(MODE_MOUSE)) {
615 mousereport(e);
616 return;
617 }
618 if(sel.mode) {
619 int oldey = sel.ey, oldex = sel.ex;
620 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
621
622 if(oldey != sel.ey || oldex != sel.ex) {
623 int starty = MIN(oldey, sel.ey);
624 int endy = MAX(oldey, sel.ey);
625 drawregion(0, (starty > 0 ? starty : 0), term.col, (endy < term.row ? endy+1 : term.row));
626 }
627 }
628 }
629
630 void
631 die(const char *errstr, ...) {
632 va_list ap;
633
634 va_start(ap, errstr);
635 vfprintf(stderr, errstr, ap);
636 va_end(ap);
637 exit(EXIT_FAILURE);
638 }
639
640 void
641 execsh(void) {
642 char **args;
643 char *envshell = getenv("SHELL");
644
645 DEFAULT(envshell, "sh");
646 putenv("TERM="TNAME);
647 args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
648 execvp(args[0], args);
649 exit(EXIT_FAILURE);
650 }
651
652 void
653 sigchld(int a) {
654 int stat = 0;
655 if(waitpid(pid, &stat, 0) < 0)
656 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
657 if(WIFEXITED(stat))
658 exit(WEXITSTATUS(stat));
659 else
660 exit(EXIT_FAILURE);
661 }
662
663 void
664 ttynew(void) {
665 int m, s;
666
667 /* seems to work fine on linux, openbsd and freebsd */
668 struct winsize w = {term.row, term.col, 0, 0};
669 if(openpty(&m, &s, NULL, NULL, &w) < 0)
670 die("openpty failed: %s\n", SERRNO);
671
672 switch(pid = fork()) {
673 case -1:
674 die("fork failed\n");
675 break;
676 case 0:
677 setsid(); /* create a new process group */
678 dup2(s, STDIN_FILENO);
679 dup2(s, STDOUT_FILENO);
680 dup2(s, STDERR_FILENO);
681 if(ioctl(s, TIOCSCTTY, NULL) < 0)
682 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
683 close(s);
684 close(m);
685 execsh();
686 break;
687 default:
688 close(s);
689 cmdfd = m;
690 signal(SIGCHLD, sigchld);
691 }
692 }
693
694 void
695 dump(char c) {
696 static int col;
697 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
698 if(++col % 10 == 0)
699 fprintf(stderr, "\n");
700 }
701
702 void
703 ttyread(void) {
704 static char buf[BUFSIZ];
705 static int buflen = 0;
706 char *ptr;
707 char s[UTF_SIZ];
708 int charsize; /* size of utf8 char in bytes */
709 long utf8c;
710 int ret;
711
712 /* append read bytes to unprocessed bytes */
713 if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
714 die("Couldn't read from shell: %s\n", SERRNO);
715
716 /* process every complete utf8 char */
717 buflen += ret;
718 ptr = buf;
719 while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
720 charsize = utf8decode(ptr, &utf8c);
721 utf8encode(&utf8c, s);
722 tputc(s);
723 ptr += charsize;
724 buflen -= charsize;
725 }
726
727 /* keep any uncomplete utf8 char for the next call */
728 memmove(buf, ptr, buflen);
729 }
730
731 void
732 ttywrite(const char *s, size_t n) {
733 if(write(cmdfd, s, n) == -1)
734 die("write error on tty: %s\n", SERRNO);
735 }
736
737 void
738 ttyresize(int x, int y) {
739 struct winsize w;
740
741 w.ws_row = term.row;
742 w.ws_col = term.col;
743 w.ws_xpixel = w.ws_ypixel = 0;
744 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
745 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
746 }
747
748 void
749 tcursor(int mode) {
750 static TCursor c;
751
752 if(mode == CURSOR_SAVE)
753 c = term.c;
754 else if(mode == CURSOR_LOAD)
755 term.c = c, tmoveto(c.x, c.y);
756 }
757
758 void
759 treset(void) {
760 term.c = (TCursor){{
761 .mode = ATTR_NULL,
762 .fg = DefaultFG,
763 .bg = DefaultBG
764 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
765
766 term.top = 0, term.bot = term.row - 1;
767 term.mode = MODE_WRAP;
768 tclearregion(0, 0, term.col-1, term.row-1);
769 }
770
771 void
772 tnew(int col, int row) {
773 /* set screen size */
774 term.row = row, term.col = col;
775 term.line = malloc(term.row * sizeof(Line));
776 term.alt = malloc(term.row * sizeof(Line));
777 for(row = 0; row < term.row; row++) {
778 term.line[row] = malloc(term.col * sizeof(Glyph));
779 term.alt [row] = malloc(term.col * sizeof(Glyph));
780 }
781 /* setup screen */
782 treset();
783 }
784
785 void
786 tswapscreen(void) {
787 Line* tmp = term.line;
788 term.line = term.alt;
789 term.alt = tmp;
790 term.mode ^= MODE_ALTSCREEN;
791 }
792
793 void
794 tscrolldown(int orig, int n) {
795 int i;
796 Line temp;
797
798 LIMIT(n, 0, term.bot-orig+1);
799
800 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
801
802 for(i = term.bot; i >= orig+n; i--) {
803 temp = term.line[i];
804 term.line[i] = term.line[i-n];
805 term.line[i-n] = temp;
806 }
807 }
808
809 void
810 tscrollup(int orig, int n) {
811 int i;
812 Line temp;
813 LIMIT(n, 0, term.bot-orig+1);
814
815 tclearregion(0, orig, term.col-1, orig+n-1);
816
817 for(i = orig; i <= term.bot-n; i++) {
818 temp = term.line[i];
819 term.line[i] = term.line[i+n];
820 term.line[i+n] = temp;
821 }
822 }
823
824 void
825 tnewline(int first_col) {
826 int y = term.c.y;
827 if(y == term.bot)
828 tscrollup(term.top, 1);
829 else
830 y++;
831 tmoveto(first_col ? 0 : term.c.x, y);
832 }
833
834 void
835 csiparse(void) {
836 /* int noarg = 1; */
837 char *p = escseq.buf;
838
839 escseq.narg = 0;
840 if(*p == '?')
841 escseq.priv = 1, p++;
842
843 while(p < escseq.buf+escseq.len) {
844 while(isdigit(*p)) {
845 escseq.arg[escseq.narg] *= 10;
846 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
847 }
848 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
849 escseq.narg++, p++;
850 else {
851 escseq.mode = *p;
852 escseq.narg++;
853 return;
854 }
855 }
856 }
857
858 void
859 tmoveto(int x, int y) {
860 LIMIT(x, 0, term.col-1);
861 LIMIT(y, 0, term.row-1);
862 term.c.state &= ~CURSOR_WRAPNEXT;
863 term.c.x = x;
864 term.c.y = y;
865 }
866
867 void
868 tsetchar(char *c) {
869 term.line[term.c.y][term.c.x] = term.c.attr;
870 memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
871 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
872 }
873
874 void
875 tclearregion(int x1, int y1, int x2, int y2) {
876 int x, y, temp;
877
878 if(x1 > x2)
879 temp = x1, x1 = x2, x2 = temp;
880 if(y1 > y2)
881 temp = y1, y1 = y2, y2 = temp;
882
883 LIMIT(x1, 0, term.col-1);
884 LIMIT(x2, 0, term.col-1);
885 LIMIT(y1, 0, term.row-1);
886 LIMIT(y2, 0, term.row-1);
887
888 for(y = y1; y <= y2; y++)
889 for(x = x1; x <= x2; x++)
890 term.line[y][x].state = 0;
891 }
892
893 void
894 tdeletechar(int n) {
895 int src = term.c.x + n;
896 int dst = term.c.x;
897 int size = term.col - src;
898
899 if(src >= term.col) {
900 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
901 return;
902 }
903 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
904 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
905 }
906
907 void
908 tinsertblank(int n) {
909 int src = term.c.x;
910 int dst = src + n;
911 int size = term.col - dst;
912
913 if(dst >= term.col) {
914 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
915 return;
916 }
917 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
918 tclearregion(src, term.c.y, dst - 1, term.c.y);
919 }
920
921 void
922 tinsertblankline(int n) {
923 if(term.c.y < term.top || term.c.y > term.bot)
924 return;
925
926 tscrolldown(term.c.y, n);
927 }
928
929 void
930 tdeleteline(int n) {
931 if(term.c.y < term.top || term.c.y > term.bot)
932 return;
933
934 tscrollup(term.c.y, n);
935 }
936
937 void
938 tsetattr(int *attr, int l) {
939 int i;
940
941 for(i = 0; i < l; i++) {
942 switch(attr[i]) {
943 case 0:
944 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
945 term.c.attr.fg = DefaultFG;
946 term.c.attr.bg = DefaultBG;
947 break;
948 case 1:
949 term.c.attr.mode |= ATTR_BOLD;
950 break;
951 case 4:
952 term.c.attr.mode |= ATTR_UNDERLINE;
953 break;
954 case 7:
955 term.c.attr.mode |= ATTR_REVERSE;
956 break;
957 case 22:
958 term.c.attr.mode &= ~ATTR_BOLD;
959 break;
960 case 24:
961 term.c.attr.mode &= ~ATTR_UNDERLINE;
962 break;
963 case 27:
964 term.c.attr.mode &= ~ATTR_REVERSE;
965 break;
966 case 38:
967 if(i + 2 < l && attr[i + 1] == 5) {
968 i += 2;
969 if(BETWEEN(attr[i], 0, 255))
970 term.c.attr.fg = attr[i];
971 else
972 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
973 }
974 else
975 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
976 break;
977 case 39:
978 term.c.attr.fg = DefaultFG;
979 break;
980 case 48:
981 if(i + 2 < l && attr[i + 1] == 5) {
982 i += 2;
983 if(BETWEEN(attr[i], 0, 255))
984 term.c.attr.bg = attr[i];
985 else
986 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
987 }
988 else
989 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
990 break;
991 case 49:
992 term.c.attr.bg = DefaultBG;
993 break;
994 default:
995 if(BETWEEN(attr[i], 30, 37))
996 term.c.attr.fg = attr[i] - 30;
997 else if(BETWEEN(attr[i], 40, 47))
998 term.c.attr.bg = attr[i] - 40;
999 else if(BETWEEN(attr[i], 90, 97))
1000 term.c.attr.fg = attr[i] - 90 + 8;
1001 else if(BETWEEN(attr[i], 100, 107))
1002 term.c.attr.fg = attr[i] - 100 + 8;
1003 else
1004 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
1005
1006 break;
1007 }
1008 }
1009 }
1010
1011 void
1012 tsetscroll(int t, int b) {
1013 int temp;
1014
1015 LIMIT(t, 0, term.row-1);
1016 LIMIT(b, 0, term.row-1);
1017 if(t > b) {
1018 temp = t;
1019 t = b;
1020 b = temp;
1021 }
1022 term.top = t;
1023 term.bot = b;
1024 }
1025
1026 void
1027 csihandle(void) {
1028 switch(escseq.mode) {
1029 default:
1030 unknown:
1031 fprintf(stderr, "erresc: unknown csi ");
1032 csidump();
1033 /* die(""); */
1034 break;
1035 case '@': /* ICH -- Insert <n> blank char */
1036 DEFAULT(escseq.arg[0], 1);
1037 tinsertblank(escseq.arg[0]);
1038 break;
1039 case 'A': /* CUU -- Cursor <n> Up */
1040 case 'e':
1041 DEFAULT(escseq.arg[0], 1);
1042 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
1043 break;
1044 case 'B': /* CUD -- Cursor <n> Down */
1045 DEFAULT(escseq.arg[0], 1);
1046 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
1047 break;
1048 case 'C': /* CUF -- Cursor <n> Forward */
1049 case 'a':
1050 DEFAULT(escseq.arg[0], 1);
1051 tmoveto(term.c.x+escseq.arg[0], term.c.y);
1052 break;
1053 case 'D': /* CUB -- Cursor <n> Backward */
1054 DEFAULT(escseq.arg[0], 1);
1055 tmoveto(term.c.x-escseq.arg[0], term.c.y);
1056 break;
1057 case 'E': /* CNL -- Cursor <n> Down and first col */
1058 DEFAULT(escseq.arg[0], 1);
1059 tmoveto(0, term.c.y+escseq.arg[0]);
1060 break;
1061 case 'F': /* CPL -- Cursor <n> Up and first col */
1062 DEFAULT(escseq.arg[0], 1);
1063 tmoveto(0, term.c.y-escseq.arg[0]);
1064 break;
1065 case 'G': /* CHA -- Move to <col> */
1066 case '`': /* XXX: HPA -- same? */
1067 DEFAULT(escseq.arg[0], 1);
1068 tmoveto(escseq.arg[0]-1, term.c.y);
1069 break;
1070 case 'H': /* CUP -- Move to <row> <col> */
1071 case 'f': /* XXX: HVP -- same? */
1072 DEFAULT(escseq.arg[0], 1);
1073 DEFAULT(escseq.arg[1], 1);
1074 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
1075 break;
1076 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
1077 case 'J': /* ED -- Clear screen */
1078 switch(escseq.arg[0]) {
1079 case 0: /* below */
1080 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1081 if(term.c.y < term.row-1)
1082 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1083 break;
1084 case 1: /* above */
1085 if(term.c.y > 1)
1086 tclearregion(0, 0, term.col-1, term.c.y-1);
1087 tclearregion(0, term.c.y, term.c.x, term.c.y);
1088 break;
1089 case 2: /* all */
1090 tclearregion(0, 0, term.col-1, term.row-1);
1091 break;
1092 default:
1093 goto unknown;
1094 }
1095 break;
1096 case 'K': /* EL -- Clear line */
1097 switch(escseq.arg[0]) {
1098 case 0: /* right */
1099 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1100 break;
1101 case 1: /* left */
1102 tclearregion(0, term.c.y, term.c.x, term.c.y);
1103 break;
1104 case 2: /* all */
1105 tclearregion(0, term.c.y, term.col-1, term.c.y);
1106 break;
1107 }
1108 break;
1109 case 'S': /* SU -- Scroll <n> line up */
1110 DEFAULT(escseq.arg[0], 1);
1111 tscrollup(term.top, escseq.arg[0]);
1112 break;
1113 case 'T': /* SD -- Scroll <n> line down */
1114 DEFAULT(escseq.arg[0], 1);
1115 tscrolldown(term.top, escseq.arg[0]);
1116 break;
1117 case 'L': /* IL -- Insert <n> blank lines */
1118 DEFAULT(escseq.arg[0], 1);
1119 tinsertblankline(escseq.arg[0]);
1120 break;
1121 case 'l': /* RM -- Reset Mode */
1122 if(escseq.priv) {
1123 switch(escseq.arg[0]) {
1124 case 1:
1125 term.mode &= ~MODE_APPKEYPAD;
1126 break;
1127 case 5: /* DECSCNM -- Remove reverse video */
1128 if(IS_SET(MODE_REVERSE)) {
1129 term.mode &= ~MODE_REVERSE;
1130 draw();
1131 }
1132 break;
1133 case 7:
1134 term.mode &= ~MODE_WRAP;
1135 break;
1136 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1137 break;
1138 case 20:
1139 term.mode &= ~MODE_CRLF;
1140 break;
1141 case 25:
1142 term.c.state |= CURSOR_HIDE;
1143 break;
1144 case 1000: /* disable X11 xterm mouse reporting */
1145 term.mode &= ~MODE_MOUSEBTN;
1146 break;
1147 case 1002:
1148 term.mode &= ~MODE_MOUSEMOTION;
1149 break;
1150 case 1049: /* = 1047 and 1048 */
1151 case 47:
1152 case 1047:
1153 if(IS_SET(MODE_ALTSCREEN)) {
1154 tclearregion(0, 0, term.col-1, term.row-1);
1155 tswapscreen();
1156 }
1157 if(escseq.arg[0] != 1049)
1158 break;
1159 case 1048:
1160 tcursor(CURSOR_LOAD);
1161 break;
1162 default:
1163 goto unknown;
1164 }
1165 } else {
1166 switch(escseq.arg[0]) {
1167 case 4:
1168 term.mode &= ~MODE_INSERT;
1169 break;
1170 default:
1171 goto unknown;
1172 }
1173 }
1174 break;
1175 case 'M': /* DL -- Delete <n> lines */
1176 DEFAULT(escseq.arg[0], 1);
1177 tdeleteline(escseq.arg[0]);
1178 break;
1179 case 'X': /* ECH -- Erase <n> char */
1180 DEFAULT(escseq.arg[0], 1);
1181 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1182 break;
1183 case 'P': /* DCH -- Delete <n> char */
1184 DEFAULT(escseq.arg[0], 1);
1185 tdeletechar(escseq.arg[0]);
1186 break;
1187 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1188 case 'd': /* VPA -- Move to <row> */
1189 DEFAULT(escseq.arg[0], 1);
1190 tmoveto(term.c.x, escseq.arg[0]-1);
1191 break;
1192 case 'h': /* SM -- Set terminal mode */
1193 if(escseq.priv) {
1194 switch(escseq.arg[0]) {
1195 case 1:
1196 term.mode |= MODE_APPKEYPAD;
1197 break;
1198 case 5: /* DECSCNM -- Reverve video */
1199 if(!IS_SET(MODE_REVERSE)) {
1200 term.mode |= MODE_REVERSE;
1201 draw();
1202 }
1203 break;
1204 case 7:
1205 term.mode |= MODE_WRAP;
1206 break;
1207 case 20:
1208 term.mode |= MODE_CRLF;
1209 break;
1210 case 12: /* att610 -- Start blinking cursor (IGNORED) */
1211 /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1212 if(escseq.narg > 1 && escseq.arg[1] != 25)
1213 break;
1214 case 25:
1215 term.c.state &= ~CURSOR_HIDE;
1216 break;
1217 case 1000: /* 1000,1002: enable xterm mouse report */
1218 term.mode |= MODE_MOUSEBTN;
1219 break;
1220 case 1002:
1221 term.mode |= MODE_MOUSEMOTION;
1222 break;
1223 case 1049: /* = 1047 and 1048 */
1224 case 47:
1225 case 1047:
1226 if(IS_SET(MODE_ALTSCREEN))
1227 tclearregion(0, 0, term.col-1, term.row-1);
1228 else
1229 tswapscreen();
1230 if(escseq.arg[0] != 1049)
1231 break;
1232 case 1048:
1233 tcursor(CURSOR_SAVE);
1234 break;
1235 default: goto unknown;
1236 }
1237 } else {
1238 switch(escseq.arg[0]) {
1239 case 4:
1240 term.mode |= MODE_INSERT;
1241 break;
1242 default: goto unknown;
1243 }
1244 };
1245 break;
1246 case 'm': /* SGR -- Terminal attribute (color) */
1247 tsetattr(escseq.arg, escseq.narg);
1248 break;
1249 case 'r': /* DECSTBM -- Set Scrolling Region */
1250 if(escseq.priv)
1251 goto unknown;
1252 else {
1253 DEFAULT(escseq.arg[0], 1);
1254 DEFAULT(escseq.arg[1], term.row);
1255 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1256 tmoveto(0, 0);
1257 }
1258 break;
1259 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1260 tcursor(CURSOR_SAVE);
1261 break;
1262 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1263 tcursor(CURSOR_LOAD);
1264 break;
1265 }
1266 }
1267
1268 void
1269 csidump(void) {
1270 int i;
1271 printf("ESC [ %s", escseq.priv ? "? " : "");
1272 if(escseq.narg)
1273 for(i = 0; i < escseq.narg; i++)
1274 printf("%d ", escseq.arg[i]);
1275 if(escseq.mode)
1276 putchar(escseq.mode);
1277 putchar('\n');
1278 }
1279
1280 void
1281 csireset(void) {
1282 memset(&escseq, 0, sizeof(escseq));
1283 }
1284
1285 void
1286 tputtab(void) {
1287 int space = TAB - term.c.x % TAB;
1288 tmoveto(term.c.x + space, term.c.y);
1289 }
1290
1291 void
1292 tputc(char *c) {
1293 char ascii = *c;
1294 if(term.esc & ESC_START) {
1295 if(term.esc & ESC_CSI) {
1296 escseq.buf[escseq.len++] = ascii;
1297 if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1298 term.esc = 0;
1299 csiparse(), csihandle();
1300 }
1301 /* TODO: handle other OSC */
1302 } else if(term.esc & ESC_OSC) {
1303 if(ascii == ';') {
1304 term.titlelen = 0;
1305 term.esc = ESC_START | ESC_TITLE;
1306 }
1307 } else if(term.esc & ESC_TITLE) {
1308 if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1309 term.esc = 0;
1310 term.title[term.titlelen] = '\0';
1311 XStoreName(xw.dpy, xw.win, term.title);
1312 } else {
1313 term.title[term.titlelen++] = ascii;
1314 }
1315 } else if(term.esc & ESC_ALTCHARSET) {
1316 switch(ascii) {
1317 case '0': /* Line drawing crap */
1318 term.c.attr.mode |= ATTR_GFX;
1319 break;
1320 case 'B': /* Back to regular text */
1321 term.c.attr.mode &= ~ATTR_GFX;
1322 break;
1323 default:
1324 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1325 }
1326 term.esc = 0;
1327 } else {
1328 switch(ascii) {
1329 case '[':
1330 term.esc |= ESC_CSI;
1331 break;
1332 case ']':
1333 term.esc |= ESC_OSC;
1334 break;
1335 case '(':
1336 term.esc |= ESC_ALTCHARSET;
1337 break;
1338 case 'D': /* IND -- Linefeed */
1339 if(term.c.y == term.bot)
1340 tscrollup(term.top, 1);
1341 else
1342 tmoveto(term.c.x, term.c.y+1);
1343 term.esc = 0;
1344 break;
1345 case 'E': /* NEL -- Next line */
1346 tnewline(1); /* always go to first col */
1347 term.esc = 0;
1348 break;
1349 case 'M': /* RI -- Reverse index */
1350 if(term.c.y == term.top)
1351 tscrolldown(term.top, 1);
1352 else
1353 tmoveto(term.c.x, term.c.y-1);
1354 term.esc = 0;
1355 break;
1356 case 'c': /* RIS -- Reset to inital state */
1357 treset();
1358 term.esc = 0;
1359 break;
1360 case '=': /* DECPAM -- Application keypad */
1361 term.mode |= MODE_APPKEYPAD;
1362 term.esc = 0;
1363 break;
1364 case '>': /* DECPNM -- Normal keypad */
1365 term.mode &= ~MODE_APPKEYPAD;
1366 term.esc = 0;
1367 break;
1368 case '7': /* DECSC -- Save Cursor */
1369 tcursor(CURSOR_SAVE);
1370 term.esc = 0;
1371 break;
1372 case '8': /* DECRC -- Restore Cursor */
1373 tcursor(CURSOR_LOAD);
1374 term.esc = 0;
1375 break;
1376 default:
1377 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1378 (unsigned char) ascii, isprint(ascii)?ascii:'.');
1379 term.esc = 0;
1380 }
1381 }
1382 } else {
1383 switch(ascii) {
1384 case '\t':
1385 tputtab();
1386 break;
1387 case '\b':
1388 tmoveto(term.c.x-1, term.c.y);
1389 break;
1390 case '\r':
1391 tmoveto(0, term.c.y);
1392 break;
1393 case '\f':
1394 case '\v':
1395 case '\n':
1396 /* go to first col if the mode is set */
1397 tnewline(IS_SET(MODE_CRLF));
1398 break;
1399 case '\a':
1400 if(!(xw.state & WIN_FOCUSED))
1401 xseturgency(1);
1402 break;
1403 case '\033':
1404 csireset();
1405 term.esc = ESC_START;
1406 break;
1407 default:
1408 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1409 tnewline(1); /* always go to first col */
1410 tsetchar(c);
1411 if(term.c.x+1 < term.col)
1412 tmoveto(term.c.x+1, term.c.y);
1413 else
1414 term.c.state |= CURSOR_WRAPNEXT;
1415 }
1416 }
1417 }
1418
1419 int
1420 tresize(int col, int row) {
1421 int i, x;
1422 int minrow = MIN(row, term.row);
1423 int mincol = MIN(col, term.col);
1424 int slide = term.c.y - row + 1;
1425
1426 if(col < 1 || row < 1)
1427 return 0;
1428
1429 /* free unneeded rows */
1430 i = 0;
1431 if(slide > 0) {
1432 /* slide screen to keep cursor where we expect it -
1433 * tscrollup would work here, but we can optimize to
1434 * memmove because we're freeing the earlier lines */
1435 for(/* i = 0 */; i < slide; i++) {
1436 free(term.line[i]);
1437 free(term.alt[i]);
1438 }
1439 memmove(term.line, term.line + slide, row * sizeof(Line));
1440 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1441 }
1442 for(i += row; i < term.row; i++) {
1443 free(term.line[i]);
1444 free(term.alt[i]);
1445 }
1446
1447 /* resize to new height */
1448 term.line = realloc(term.line, row * sizeof(Line));
1449 term.alt = realloc(term.alt, row * sizeof(Line));
1450
1451 /* resize each row to new width, zero-pad if needed */
1452 for(i = 0; i < minrow; i++) {
1453 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1454 term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
1455 for(x = mincol; x < col; x++) {
1456 term.line[i][x].state = 0;
1457 term.alt[i][x].state = 0;
1458 }
1459 }
1460
1461 /* allocate any new rows */
1462 for(/* i == minrow */; i < row; i++) {
1463 term.line[i] = calloc(col, sizeof(Glyph));
1464 term.alt [i] = calloc(col, sizeof(Glyph));
1465 }
1466
1467 /* update terminal size */
1468 term.col = col, term.row = row;
1469 /* make use of the LIMIT in tmoveto */
1470 tmoveto(term.c.x, term.c.y);
1471 /* reset scrolling region */
1472 tsetscroll(0, row-1);
1473 return (slide > 0);
1474 }
1475
1476 void
1477 xresize(int col, int row) {
1478 Pixmap newbuf;
1479 int oldw, oldh;
1480
1481 oldw = xw.bufw;
1482 oldh = xw.bufh;
1483 xw.bufw = MAX(1, col * xw.cw);
1484 xw.bufh = MAX(1, row * xw.ch);
1485 newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1486 XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1487 XFreePixmap(xw.dpy, xw.buf);
1488 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1489 if(xw.bufw > oldw)
1490 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1491 xw.bufw-oldw, MIN(xw.bufh, oldh));
1492 else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1493 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1494 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1495 False);
1496 if(xw.bufh > oldh)
1497 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1498 xw.bufw, xw.bufh-oldh);
1499 else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1500 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1501 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1502 False);
1503 xw.buf = newbuf;
1504 }
1505
1506 void
1507 xloadcols(void) {
1508 int i, r, g, b;
1509 XColor color;
1510 unsigned long white = WhitePixel(xw.dpy, xw.scr);
1511
1512 for(i = 0; i < 16; i++) {
1513 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1514 dc.col[i] = white;
1515 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1516 } else
1517 dc.col[i] = color.pixel;
1518 }
1519
1520 /* same colors as xterm */
1521 for(r = 0; r < 6; r++)
1522 for(g = 0; g < 6; g++)
1523 for(b = 0; b < 6; b++) {
1524 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1525 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1526 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1527 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1528 dc.col[i] = white;
1529 fprintf(stderr, "Could not allocate color %d\n", i);
1530 } else
1531 dc.col[i] = color.pixel;
1532 i++;
1533 }
1534
1535 for(r = 0; r < 24; r++, i++) {
1536 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1537 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1538 dc.col[i] = white;
1539 fprintf(stderr, "Could not allocate color %d\n", i);
1540 } else
1541 dc.col[i] = color.pixel;
1542 }
1543 }
1544
1545 void
1546 xclear(int x1, int y1, int x2, int y2) {
1547 XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1548 XFillRectangle(xw.dpy, xw.buf, dc.gc,
1549 x1 * xw.cw, y1 * xw.ch,
1550 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1551 }
1552
1553 void
1554 xhints(void) {
1555 XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1556 XWMHints wm = {.flags = InputHint, .input = 1};
1557 XSizeHints size = {
1558 .flags = PSize | PResizeInc | PBaseSize,
1559 .height = xw.h,
1560 .width = xw.w,
1561 .height_inc = xw.ch,
1562 .width_inc = xw.cw,
1563 .base_height = 2*BORDER,
1564 .base_width = 2*BORDER,
1565 };
1566 XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1567 }
1568
1569 XFontSet
1570 xinitfont(char *fontstr) {
1571 XFontSet set;
1572 char *def, **missing;
1573 int n;
1574
1575 missing = NULL;
1576 set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1577 if(missing) {
1578 while(n--)
1579 fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1580 XFreeStringList(missing);
1581 }
1582 return set;
1583 }
1584
1585 void
1586 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1587 XFontStruct **xfonts;
1588 char **font_names;
1589 int i, n;
1590
1591 *ascent = *descent = *lbearing = *rbearing = 0;
1592 n = XFontsOfFontSet(set, &xfonts, &font_names);
1593 for(i = 0; i < n; i++) {
1594 *ascent = MAX(*ascent, (*xfonts)->ascent);
1595 *descent = MAX(*descent, (*xfonts)->descent);
1596 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1597 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1598 xfonts++;
1599 }
1600 }
1601
1602 void
1603 initfonts(char *fontstr, char *bfontstr) {
1604 if((dc.font.set = xinitfont(fontstr)) == NULL ||
1605 (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1606 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1607 xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1608 &dc.font.lbearing, &dc.font.rbearing);
1609 xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1610 &dc.bfont.lbearing, &dc.bfont.rbearing);
1611 }
1612
1613 void
1614 xinit(void) {
1615 XSetWindowAttributes attrs;
1616 Cursor cursor;
1617 Window parent;
1618
1619 if(!(xw.dpy = XOpenDisplay(NULL)))
1620 die("Can't open display\n");
1621 xw.scr = XDefaultScreen(xw.dpy);
1622
1623 /* font */
1624 initfonts(FONT, BOLDFONT);
1625
1626 /* XXX: Assuming same size for bold font */
1627 xw.cw = dc.font.rbearing - dc.font.lbearing;
1628 xw.ch = dc.font.ascent + dc.font.descent;
1629
1630 /* colors */
1631 xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1632 xloadcols();
1633
1634 /* window - default size */
1635 xw.bufh = term.row * xw.ch;
1636 xw.bufw = term.col * xw.cw;
1637 xw.h = xw.bufh + 2*BORDER;
1638 xw.w = xw.bufw + 2*BORDER;
1639
1640 attrs.background_pixel = dc.col[DefaultBG];
1641 attrs.border_pixel = dc.col[DefaultBG];
1642 attrs.bit_gravity = NorthWestGravity;
1643 attrs.event_mask = FocusChangeMask | KeyPressMask
1644 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1645 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask
1646 | EnterWindowMask | LeaveWindowMask;
1647 attrs.colormap = xw.cmap;
1648
1649 parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
1650 xw.win = XCreateWindow(xw.dpy, parent, 0, 0,
1651 xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1652 XDefaultVisual(xw.dpy, xw.scr),
1653 CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1654 | CWColormap,
1655 &attrs);
1656 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1657
1658
1659 /* input methods */
1660 xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1661 xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1662 | XIMStatusNothing, XNClientWindow, xw.win,
1663 XNFocusWindow, xw.win, NULL);
1664 /* gc */
1665 dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1666
1667 /* white cursor, black outline */
1668 cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1669 XDefineCursor(xw.dpy, xw.win, cursor);
1670 XRecolorCursor(xw.dpy, cursor,
1671 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1672 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1673
1674 xembedatom = XInternAtom(xw.dpy, "_XEMBED", False);
1675
1676 XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1677 XMapWindow(xw.dpy, xw.win);
1678 xhints();
1679 XSync(xw.dpy, 0);
1680 }
1681
1682 void
1683 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1684 unsigned long xfg = dc.col[base.fg], xbg = dc.col[base.bg], temp;
1685 int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1686 int i;
1687
1688 /* only switch default fg/bg if term is in RV mode */
1689 if(IS_SET(MODE_REVERSE)) {
1690 if(base.fg == DefaultFG)
1691 xfg = dc.col[DefaultBG];
1692 if(base.bg == DefaultBG)
1693 xbg = dc.col[DefaultFG];
1694 }
1695
1696 if(base.mode & ATTR_REVERSE)
1697 temp = xfg, xfg = xbg, xbg = temp;
1698
1699 XSetBackground(xw.dpy, dc.gc, xbg);
1700 XSetForeground(xw.dpy, dc.gc, xfg);
1701
1702 if(base.mode & ATTR_GFX) {
1703 for(i = 0; i < bytelen; i++) {
1704 char c = gfx[(unsigned int)s[i] % 256];
1705 if(c)
1706 s[i] = c;
1707 else if(s[i] > 0x5f)
1708 s[i] -= 0x5f;
1709 }
1710 }
1711
1712 XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1713 dc.gc, winx, winy, s, bytelen);
1714
1715 if(base.mode & ATTR_UNDERLINE)
1716 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1717 }
1718
1719 void
1720 xdrawcursor(void) {
1721 static int oldx = 0;
1722 static int oldy = 0;
1723 int sl;
1724 Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1725
1726 LIMIT(oldx, 0, term.col-1);
1727 LIMIT(oldy, 0, term.row-1);
1728
1729 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1730 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1731
1732 /* remove the old cursor */
1733 if(term.line[oldy][oldx].state & GLYPH_SET) {
1734 sl = utf8size(term.line[oldy][oldx].c);
1735 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1736 } else
1737 xclear(oldx, oldy, oldx, oldy);
1738
1739 /* draw the new one */
1740 if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1741 sl = utf8size(g.c);
1742 if(IS_SET(MODE_REVERSE))
1743 g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
1744 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1745 oldx = term.c.x, oldy = term.c.y;
1746 }
1747 }
1748
1749 void
1750 draw() {
1751 drawregion(0, 0, term.col, term.row);
1752 }
1753
1754 void
1755 drawregion(int x1, int y1, int x2, int y2) {
1756 int ic, ib, x, y, ox, sl;
1757 Glyph base, new;
1758 char buf[DRAW_BUF_SIZ];
1759
1760 if(!(xw.state & WIN_VISIBLE))
1761 return;
1762
1763 xclear(x1, y1, x2-1, y2-1);
1764 for(y = y1; y < y2; y++) {
1765 base = term.line[y][0];
1766 ic = ib = ox = 0;
1767 for(x = x1; x < x2; x++) {
1768 new = term.line[y][x];
1769 if(sel.bx != -1 && *(new.c) && selected(x, y))
1770 new.mode ^= ATTR_REVERSE;
1771 if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1772 ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1773 xdraws(buf, base, ox, y, ic, ib);
1774 ic = ib = 0;
1775 }
1776 if(new.state & GLYPH_SET) {
1777 if(ib == 0) {
1778 ox = x;
1779 base = new;
1780 }
1781 sl = utf8size(new.c);
1782 memcpy(buf+ib, new.c, sl);
1783 ib += sl;
1784 ++ic;
1785 }
1786 }
1787 if(ib > 0)
1788 xdraws(buf, base, ox, y, ic, ib);
1789 }
1790 xdrawcursor();
1791 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1792 }
1793
1794 void
1795 expose(XEvent *ev) {
1796 XExposeEvent *e = &ev->xexpose;
1797 if(xw.state & WIN_REDRAW) {
1798 if(!e->count) {
1799 xw.state &= ~WIN_REDRAW;
1800 draw();
1801 }
1802 } else
1803 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1804 e->width, e->height, e->x, e->y);
1805 }
1806
1807 void
1808 visibility(XEvent *ev) {
1809 XVisibilityEvent *e = &ev->xvisibility;
1810 if(e->state == VisibilityFullyObscured)
1811 xw.state &= ~WIN_VISIBLE;
1812 else if(!(xw.state & WIN_VISIBLE))
1813 /* need a full redraw for next Expose, not just a buf copy */
1814 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1815 }
1816
1817 void
1818 unmap(XEvent *ev) {
1819 xw.state &= ~WIN_VISIBLE;
1820 }
1821
1822 void
1823 xseturgency(int add) {
1824 XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1825 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1826 XSetWMHints(xw.dpy, xw.win, h);
1827 XFree(h);
1828 }
1829
1830 void
1831 focus(XEvent *ev) {
1832 if(ev->type == FocusIn) {
1833 xw.state |= WIN_FOCUSED;
1834 xseturgency(0);
1835 } else
1836 xw.state &= ~WIN_FOCUSED;
1837 draw();
1838 }
1839
1840 char*
1841 kmap(KeySym k, unsigned int state) {
1842 int i;
1843 for(i = 0; i < LEN(key); i++)
1844 if(key[i].k == k && (key[i].mask == 0 || key[i].mask & state))
1845 return (char*)key[i].s;
1846 return NULL;
1847 }
1848
1849 void
1850 kpress(XEvent *ev) {
1851 XKeyEvent *e = &ev->xkey;
1852 KeySym ksym;
1853 char buf[32];
1854 char *customkey;
1855 int len;
1856 int meta;
1857 int shift;
1858 Status status;
1859
1860 meta = e->state & Mod1Mask;
1861 shift = e->state & ShiftMask;
1862 len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1863
1864 /* 1. custom keys from config.h */
1865 if((customkey = kmap(ksym, e->state)))
1866 ttywrite(customkey, strlen(customkey));
1867 /* 2. hardcoded (overrides X lookup) */
1868 else
1869 switch(ksym) {
1870 case XK_Up:
1871 case XK_Down:
1872 case XK_Left:
1873 case XK_Right:
1874 /* XXX: shift up/down doesn't work */
1875 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
1876 ttywrite(buf, 3);
1877 break;
1878 case XK_Insert:
1879 if(shift)
1880 selpaste();
1881 break;
1882 case XK_Return:
1883 if(IS_SET(MODE_CRLF))
1884 ttywrite("\r\n", 2);
1885 else
1886 ttywrite("\r", 1);
1887 break;
1888 /* 3. X lookup */
1889 default:
1890 if(len > 0) {
1891 if(meta && len == 1)
1892 ttywrite("\033", 1);
1893 ttywrite(buf, len);
1894 }
1895 break;
1896 }
1897 }
1898
1899 void
1900 cmessage(XEvent *e) {
1901 if (e->xclient.message_type == xembedatom && e->xclient.format == 32) {
1902 if (e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
1903 xw.state |= WIN_FOCUSED;
1904 xseturgency(0);
1905 } else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
1906 xw.state &= ~WIN_FOCUSED;
1907 }
1908 draw();
1909 }
1910 }
1911
1912 void
1913 resize(XEvent *e) {
1914 int col, row;
1915
1916 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1917 return;
1918
1919 xw.w = e->xconfigure.width;
1920 xw.h = e->xconfigure.height;
1921 col = (xw.w - 2*BORDER) / xw.cw;
1922 row = (xw.h - 2*BORDER) / xw.ch;
1923 if(col == term.col && row == term.row)
1924 return;
1925 if(tresize(col, row))
1926 draw();
1927 ttyresize(col, row);
1928 xresize(col, row);
1929 }
1930
1931 void
1932 run(void) {
1933 XEvent ev;
1934 fd_set rfd;
1935 int xfd = XConnectionNumber(xw.dpy);
1936
1937 for(;;) {
1938 FD_ZERO(&rfd);
1939 FD_SET(cmdfd, &rfd);
1940 FD_SET(xfd, &rfd);
1941 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1942 if(errno == EINTR)
1943 continue;
1944 die("select failed: %s\n", SERRNO);
1945 }
1946 if(FD_ISSET(cmdfd, &rfd)) {
1947 ttyread();
1948 draw();
1949 }
1950 while(XPending(xw.dpy)) {
1951 XNextEvent(xw.dpy, &ev);
1952 if(XFilterEvent(&ev, xw.win))
1953 continue;
1954 if(handler[ev.type])
1955 (handler[ev.type])(&ev);
1956 }
1957 }
1958 }
1959
1960 int
1961 main(int argc, char *argv[]) {
1962 int i;
1963
1964 for(i = 1; i < argc; i++) {
1965 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1966 case 't':
1967 if(++i < argc) opt_title = argv[i];
1968 break;
1969 case 'c':
1970 if(++i < argc) opt_class = argv[i];
1971 break;
1972 case 'w':
1973 if(++i < argc) opt_embed = argv[i];
1974 break;
1975 case 'e':
1976 /* eat every remaining arguments */
1977 if(++i < argc) opt_cmd = &argv[i];
1978 goto run;
1979 case 'v':
1980 default:
1981 die(USAGE);
1982 }
1983 }
1984
1985 run:
1986 setlocale(LC_CTYPE, "");
1987 tnew(80, 24);
1988 ttynew();
1989 xinit();
1990 selinit();
1991 run();
1992 return 0;
1993 }