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c295de61fca76b9428620e5db8520aa65fdac86b
[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 #define XK_NO_MOD UINT_MAX
51 #define XK_ANY_MOD 0
52
53 #define SERRNO strerror(errno)
54 #define MIN(a, b) ((a) < (b) ? (a) : (b))
55 #define MAX(a, b) ((a) < (b) ? (b) : (a))
56 #define LEN(a) (sizeof(a) / sizeof(a[0]))
57 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
58 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
59 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
60 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
61 #define IS_SET(flag) (term.mode & (flag))
62 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
63 #define X2COL(x) (((x) - BORDER)/xw.cw)
64 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
65
66 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
67 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
68 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
69 CURSOR_SAVE, CURSOR_LOAD };
70 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
71 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
72 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
73 MODE_CRLF=16, MODE_MOUSEBTN=32, MODE_MOUSEMOTION=64, MODE_MOUSE=32|64, MODE_REVERSE=128 };
74 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
75 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
76
77 #undef B0
78 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
79
80 typedef struct {
81 char c[UTF_SIZ]; /* character code */
82 char mode; /* attribute flags */
83 int fg; /* foreground */
84 int bg; /* background */
85 char state; /* state flags */
86 } Glyph;
87
88 typedef Glyph* Line;
89
90 typedef struct {
91 Glyph attr; /* current char attributes */
92 int x;
93 int y;
94 char state;
95 } TCursor;
96
97 /* CSI Escape sequence structs */
98 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
99 typedef struct {
100 char buf[ESC_BUF_SIZ]; /* raw string */
101 int len; /* raw string length */
102 char priv;
103 int arg[ESC_ARG_SIZ];
104 int narg; /* nb of args */
105 char mode;
106 } CSIEscape;
107
108 /* Internal representation of the screen */
109 typedef struct {
110 int row; /* nb row */
111 int col; /* nb col */
112 Line* line; /* screen */
113 Line* alt; /* alternate screen */
114 TCursor c; /* cursor */
115 int top; /* top scroll limit */
116 int bot; /* bottom scroll limit */
117 int mode; /* terminal mode flags */
118 int esc; /* escape state flags */
119 char title[ESC_TITLE_SIZ];
120 int titlelen;
121 } Term;
122
123 /* Purely graphic info */
124 typedef struct {
125 Display* dpy;
126 Colormap cmap;
127 Window win;
128 Pixmap buf;
129 Atom xembed;
130 XIM xim;
131 XIC xic;
132 int scr;
133 int w; /* window width */
134 int h; /* window height */
135 int bufw; /* pixmap width */
136 int bufh; /* pixmap height */
137 int ch; /* char height */
138 int cw; /* char width */
139 char state; /* focus, redraw, visible */
140 } XWindow;
141
142 typedef struct {
143 KeySym k;
144 unsigned int mask;
145 char s[ESC_BUF_SIZ];
146 } Key;
147
148 /* Drawing Context */
149 typedef struct {
150 unsigned long col[256];
151 GC gc;
152 struct {
153 int ascent;
154 int descent;
155 short lbearing;
156 short rbearing;
157 XFontSet set;
158 } font, bfont;
159 } DC;
160
161 /* TODO: use better name for vars... */
162 typedef struct {
163 int mode;
164 int bx, by;
165 int ex, ey;
166 struct {int x, y;} b, e;
167 char *clip;
168 Atom xtarget;
169 struct timeval tclick1;
170 struct timeval tclick2;
171 } Selection;
172
173 #include "config.h"
174
175 static void die(const char*, ...);
176 static void draw(void);
177 static void drawregion(int, int, int, int);
178 static void execsh(void);
179 static void sigchld(int);
180 static void run(void);
181
182 static void csidump(void);
183 static void csihandle(void);
184 static void csiparse(void);
185 static void csireset(void);
186
187 static void tclearregion(int, int, int, int);
188 static void tcursor(int);
189 static void tdeletechar(int);
190 static void tdeleteline(int);
191 static void tinsertblank(int);
192 static void tinsertblankline(int);
193 static void tmoveto(int, int);
194 static void tnew(int, int);
195 static void tnewline(int);
196 static void tputtab(void);
197 static void tputc(char*);
198 static void treset(void);
199 static int tresize(int, int);
200 static void tscrollup(int, int);
201 static void tscrolldown(int, int);
202 static void tsetattr(int*, int);
203 static void tsetchar(char*);
204 static void tsetscroll(int, int);
205 static void tswapscreen(void);
206
207 static void ttynew(void);
208 static void ttyread(void);
209 static void ttyresize(int, int);
210 static void ttywrite(const char *, size_t);
211
212 static void xdraws(char *, Glyph, int, int, int, int);
213 static void xhints(void);
214 static void xclear(int, int, int, int);
215 static void xdrawcursor(void);
216 static void xinit(void);
217 static void xloadcols(void);
218 static void xseturgency(int);
219 static void xsetsel(char*);
220 static void xresize(int, int);
221
222 static void expose(XEvent *);
223 static void visibility(XEvent *);
224 static void unmap(XEvent *);
225 static char* kmap(KeySym, unsigned int state);
226 static void kpress(XEvent *);
227 static void cmessage(XEvent *);
228 static void resize(XEvent *);
229 static void focus(XEvent *);
230 static void brelease(XEvent *);
231 static void bpress(XEvent *);
232 static void bmotion(XEvent *);
233 static void selnotify(XEvent *);
234 static void selrequest(XEvent *);
235
236 static void selinit(void);
237 static inline int selected(int, int);
238 static void selcopy(void);
239 static void selpaste();
240
241 static int utf8decode(char *, long *);
242 static int utf8encode(long *, char *);
243 static int utf8size(char *);
244 static int isfullutf8(char *, int);
245
246 static void (*handler[LASTEvent])(XEvent *) = {
247 [KeyPress] = kpress,
248 [ClientMessage] = cmessage,
249 [ConfigureNotify] = resize,
250 [VisibilityNotify] = visibility,
251 [UnmapNotify] = unmap,
252 [Expose] = expose,
253 [FocusIn] = focus,
254 [FocusOut] = focus,
255 [MotionNotify] = bmotion,
256 [ButtonPress] = bpress,
257 [ButtonRelease] = brelease,
258 [SelectionNotify] = selnotify,
259 [SelectionRequest] = selrequest,
260 };
261
262 /* Globals */
263 static DC dc;
264 static XWindow xw;
265 static Term term;
266 static CSIEscape escseq;
267 static int cmdfd;
268 static pid_t pid;
269 static Selection sel;
270 static char **opt_cmd = NULL;
271 static char *opt_title = NULL;
272 static char *opt_embed = NULL;
273 static char *opt_class = NULL;
274
275 int
276 utf8decode(char *s, long *u) {
277 unsigned char c;
278 int i, n, rtn;
279
280 rtn = 1;
281 c = *s;
282 if(~c&B7) { /* 0xxxxxxx */
283 *u = c;
284 return rtn;
285 } else if((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
286 *u = c&(B4|B3|B2|B1|B0);
287 n = 1;
288 } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
289 *u = c&(B3|B2|B1|B0);
290 n = 2;
291 } else if((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
292 *u = c&(B2|B1|B0);
293 n = 3;
294 } else
295 goto invalid;
296 for(i=n,++s; i>0; --i,++rtn,++s) {
297 c = *s;
298 if((c&(B7|B6)) != B7) /* 10xxxxxx */
299 goto invalid;
300 *u <<= 6;
301 *u |= c&(B5|B4|B3|B2|B1|B0);
302 }
303 if((n == 1 && *u < 0x80) ||
304 (n == 2 && *u < 0x800) ||
305 (n == 3 && *u < 0x10000) ||
306 (*u >= 0xD800 && *u <= 0xDFFF))
307 goto invalid;
308 return rtn;
309 invalid:
310 *u = 0xFFFD;
311 return rtn;
312 }
313
314 int
315 utf8encode(long *u, char *s) {
316 unsigned char *sp;
317 unsigned long uc;
318 int i, n;
319
320 sp = (unsigned char*) s;
321 uc = *u;
322 if(uc < 0x80) {
323 *sp = uc; /* 0xxxxxxx */
324 return 1;
325 } else if(*u < 0x800) {
326 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
327 n = 1;
328 } else if(uc < 0x10000) {
329 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
330 n = 2;
331 } else if(uc <= 0x10FFFF) {
332 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
333 n = 3;
334 } else {
335 goto invalid;
336 }
337 for(i=n,++sp; i>0; --i,++sp)
338 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
339 return n+1;
340 invalid:
341 /* U+FFFD */
342 *s++ = '\xEF';
343 *s++ = '\xBF';
344 *s = '\xBD';
345 return 3;
346 }
347
348 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
349 UTF-8 otherwise return 0 */
350 int
351 isfullutf8(char *s, int b) {
352 unsigned char *c1, *c2, *c3;
353
354 c1 = (unsigned char *) s;
355 c2 = (unsigned char *) ++s;
356 c3 = (unsigned char *) ++s;
357 if(b < 1)
358 return 0;
359 else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
360 return 0;
361 else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
362 ((b == 1) ||
363 ((b == 2) && (*c2&(B7|B6)) == B7)))
364 return 0;
365 else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
366 ((b == 1) ||
367 ((b == 2) && (*c2&(B7|B6)) == B7) ||
368 ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
369 return 0;
370 else
371 return 1;
372 }
373
374 int
375 utf8size(char *s) {
376 unsigned char c = *s;
377
378 if(~c&B7)
379 return 1;
380 else if((c&(B7|B6|B5)) == (B7|B6))
381 return 2;
382 else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
383 return 3;
384 else
385 return 4;
386 }
387
388 void
389 selinit(void) {
390 sel.tclick1.tv_sec = 0;
391 sel.tclick1.tv_usec = 0;
392 sel.mode = 0;
393 sel.bx = -1;
394 sel.clip = NULL;
395 sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
396 if(sel.xtarget == None)
397 sel.xtarget = XA_STRING;
398 }
399
400 static inline int
401 selected(int x, int y) {
402 if(sel.ey == y && sel.by == y) {
403 int bx = MIN(sel.bx, sel.ex);
404 int ex = MAX(sel.bx, sel.ex);
405 return BETWEEN(x, bx, ex);
406 }
407 return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
408 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
409 }
410
411 void
412 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
413 if(b)
414 *b = e->xbutton.button;
415
416 *x = X2COL(e->xbutton.x);
417 *y = Y2ROW(e->xbutton.y);
418 sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
419 sel.b.y = MIN(sel.by, sel.ey);
420 sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
421 sel.e.y = MAX(sel.by, sel.ey);
422 }
423
424 void
425 mousereport(XEvent *e) {
426 int x = X2COL(e->xbutton.x);
427 int y = Y2ROW(e->xbutton.y);
428 int button = e->xbutton.button;
429 int state = e->xbutton.state;
430 char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
431 static int ob, ox, oy;
432
433 /* from urxvt */
434 if(e->xbutton.type == MotionNotify) {
435 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
436 return;
437 button = ob + 32;
438 ox = x, oy = y;
439 } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
440 button = 3;
441 } else {
442 button -= Button1;
443 if(button >= 3)
444 button += 64 - 3;
445 if(e->xbutton.type == ButtonPress) {
446 ob = button;
447 ox = x, oy = y;
448 }
449 }
450
451 buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
452 + (state & Mod4Mask ? 8 : 0)
453 + (state & ControlMask ? 16 : 0);
454
455 ttywrite(buf, sizeof(buf));
456 }
457
458 void
459 bpress(XEvent *e) {
460 if(IS_SET(MODE_MOUSE))
461 mousereport(e);
462 else if(e->xbutton.button == Button1) {
463 sel.mode = 1;
464 sel.ex = sel.bx = X2COL(e->xbutton.x);
465 sel.ey = sel.by = Y2ROW(e->xbutton.y);
466 }
467 }
468
469 void
470 selcopy(void) {
471 char *str, *ptr;
472 int x, y, sz, sl, ls = 0;
473
474 if(sel.bx == -1)
475 str = NULL;
476 else {
477 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
478 ptr = str = malloc(sz);
479 for(y = 0; y < term.row; y++) {
480 for(x = 0; x < term.col; x++)
481 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
482 sl = utf8size(term.line[y][x].c);
483 memcpy(ptr, term.line[y][x].c, sl);
484 ptr += sl;
485 }
486 if(ls && y < sel.e.y)
487 *ptr++ = '\n';
488 }
489 *ptr = 0;
490 }
491 xsetsel(str);
492 }
493
494 void
495 selnotify(XEvent *e) {
496 unsigned long nitems, ofs, rem;
497 int format;
498 unsigned char *data;
499 Atom type;
500
501 ofs = 0;
502 do {
503 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
504 False, AnyPropertyType, &type, &format,
505 &nitems, &rem, &data)) {
506 fprintf(stderr, "Clipboard allocation failed\n");
507 return;
508 }
509 ttywrite((const char *) data, nitems * format / 8);
510 XFree(data);
511 /* number of 32-bit chunks returned */
512 ofs += nitems * format / 32;
513 } while(rem > 0);
514 }
515
516 void
517 selpaste() {
518 XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
519 }
520
521 void
522 selrequest(XEvent *e) {
523 XSelectionRequestEvent *xsre;
524 XSelectionEvent xev;
525 Atom xa_targets;
526
527 xsre = (XSelectionRequestEvent *) e;
528 xev.type = SelectionNotify;
529 xev.requestor = xsre->requestor;
530 xev.selection = xsre->selection;
531 xev.target = xsre->target;
532 xev.time = xsre->time;
533 /* reject */
534 xev.property = None;
535
536 xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
537 if(xsre->target == xa_targets) {
538 /* respond with the supported type */
539 Atom string = sel.xtarget;
540 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
541 XA_ATOM, 32, PropModeReplace,
542 (unsigned char *) &string, 1);
543 xev.property = xsre->property;
544 } else if(xsre->target == sel.xtarget) {
545 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
546 xsre->target, 8, PropModeReplace,
547 (unsigned char *) sel.clip, strlen(sel.clip));
548 xev.property = xsre->property;
549 }
550
551 /* all done, send a notification to the listener */
552 if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
553 fprintf(stderr, "Error sending SelectionNotify event\n");
554 }
555
556 void
557 xsetsel(char *str) {
558 /* register the selection for both the clipboard and the primary */
559 Atom clipboard;
560
561 free(sel.clip);
562 sel.clip = str;
563
564 XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
565
566 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
567 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
568
569 XFlush(xw.dpy);
570 }
571
572 void
573 brelease(XEvent *e) {
574 if(IS_SET(MODE_MOUSE)) {
575 mousereport(e);
576 return;
577 }
578 if(e->xbutton.button == Button2)
579 selpaste();
580 else if(e->xbutton.button == Button1) {
581 sel.mode = 0;
582 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
583 if(sel.bx == sel.ex && sel.by == sel.ey) {
584 struct timeval now;
585 sel.bx = -1;
586 gettimeofday(&now, NULL);
587
588 if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
589 /* triple click on the line */
590 sel.b.x = sel.bx = 0;
591 sel.e.x = sel.ex = term.col;
592 sel.b.y = sel.e.y = sel.ey;
593 selcopy();
594 } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
595 /* double click to select word */
596 sel.bx = sel.ex;
597 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
598 term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
599 sel.b.x = sel.bx;
600 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
601 term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
602 sel.e.x = sel.ex;
603 sel.b.y = sel.e.y = sel.ey;
604 selcopy();
605 }
606 } else
607 selcopy();
608 }
609 memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
610 gettimeofday(&sel.tclick1, NULL);
611 draw();
612 }
613
614 void
615 bmotion(XEvent *e) {
616 if(IS_SET(MODE_MOUSE)) {
617 mousereport(e);
618 return;
619 }
620 if(sel.mode) {
621 int oldey = sel.ey, oldex = sel.ex;
622 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
623
624 if(oldey != sel.ey || oldex != sel.ex) {
625 int starty = MIN(oldey, sel.ey);
626 int endy = MAX(oldey, sel.ey);
627 drawregion(0, (starty > 0 ? starty : 0), term.col, (endy < term.row ? endy+1 : term.row));
628 }
629 }
630 }
631
632 void
633 die(const char *errstr, ...) {
634 va_list ap;
635
636 va_start(ap, errstr);
637 vfprintf(stderr, errstr, ap);
638 va_end(ap);
639 exit(EXIT_FAILURE);
640 }
641
642 void
643 execsh(void) {
644 char **args;
645 char *envshell = getenv("SHELL");
646
647 DEFAULT(envshell, "sh");
648 putenv("TERM="TNAME);
649 args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
650 execvp(args[0], args);
651 exit(EXIT_FAILURE);
652 }
653
654 void
655 sigchld(int a) {
656 int stat = 0;
657 if(waitpid(pid, &stat, 0) < 0)
658 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
659 if(WIFEXITED(stat))
660 exit(WEXITSTATUS(stat));
661 else
662 exit(EXIT_FAILURE);
663 }
664
665 void
666 ttynew(void) {
667 int m, s;
668
669 /* seems to work fine on linux, openbsd and freebsd */
670 struct winsize w = {term.row, term.col, 0, 0};
671 if(openpty(&m, &s, NULL, NULL, &w) < 0)
672 die("openpty failed: %s\n", SERRNO);
673
674 switch(pid = fork()) {
675 case -1:
676 die("fork failed\n");
677 break;
678 case 0:
679 setsid(); /* create a new process group */
680 dup2(s, STDIN_FILENO);
681 dup2(s, STDOUT_FILENO);
682 dup2(s, STDERR_FILENO);
683 if(ioctl(s, TIOCSCTTY, NULL) < 0)
684 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
685 close(s);
686 close(m);
687 execsh();
688 break;
689 default:
690 close(s);
691 cmdfd = m;
692 signal(SIGCHLD, sigchld);
693 }
694 }
695
696 void
697 dump(char c) {
698 static int col;
699 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
700 if(++col % 10 == 0)
701 fprintf(stderr, "\n");
702 }
703
704 void
705 ttyread(void) {
706 static char buf[BUFSIZ];
707 static int buflen = 0;
708 char *ptr;
709 char s[UTF_SIZ];
710 int charsize; /* size of utf8 char in bytes */
711 long utf8c;
712 int ret;
713
714 /* append read bytes to unprocessed bytes */
715 if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
716 die("Couldn't read from shell: %s\n", SERRNO);
717
718 /* process every complete utf8 char */
719 buflen += ret;
720 ptr = buf;
721 while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
722 charsize = utf8decode(ptr, &utf8c);
723 utf8encode(&utf8c, s);
724 tputc(s);
725 ptr += charsize;
726 buflen -= charsize;
727 }
728
729 /* keep any uncomplete utf8 char for the next call */
730 memmove(buf, ptr, buflen);
731 }
732
733 void
734 ttywrite(const char *s, size_t n) {
735 if(write(cmdfd, s, n) == -1)
736 die("write error on tty: %s\n", SERRNO);
737 }
738
739 void
740 ttyresize(int x, int y) {
741 struct winsize w;
742
743 w.ws_row = term.row;
744 w.ws_col = term.col;
745 w.ws_xpixel = w.ws_ypixel = 0;
746 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
747 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
748 }
749
750 void
751 tcursor(int mode) {
752 static TCursor c;
753
754 if(mode == CURSOR_SAVE)
755 c = term.c;
756 else if(mode == CURSOR_LOAD)
757 term.c = c, tmoveto(c.x, c.y);
758 }
759
760 void
761 treset(void) {
762 term.c = (TCursor){{
763 .mode = ATTR_NULL,
764 .fg = DefaultFG,
765 .bg = DefaultBG
766 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
767
768 term.top = 0, term.bot = term.row - 1;
769 term.mode = MODE_WRAP;
770 tclearregion(0, 0, term.col-1, term.row-1);
771 }
772
773 void
774 tnew(int col, int row) {
775 /* set screen size */
776 term.row = row, term.col = col;
777 term.line = malloc(term.row * sizeof(Line));
778 term.alt = malloc(term.row * sizeof(Line));
779 for(row = 0; row < term.row; row++) {
780 term.line[row] = malloc(term.col * sizeof(Glyph));
781 term.alt [row] = malloc(term.col * sizeof(Glyph));
782 }
783 /* setup screen */
784 treset();
785 }
786
787 void
788 tswapscreen(void) {
789 Line* tmp = term.line;
790 term.line = term.alt;
791 term.alt = tmp;
792 term.mode ^= MODE_ALTSCREEN;
793 }
794
795 void
796 tscrolldown(int orig, int n) {
797 int i;
798 Line temp;
799
800 LIMIT(n, 0, term.bot-orig+1);
801
802 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
803
804 for(i = term.bot; i >= orig+n; i--) {
805 temp = term.line[i];
806 term.line[i] = term.line[i-n];
807 term.line[i-n] = temp;
808 }
809 }
810
811 void
812 tscrollup(int orig, int n) {
813 int i;
814 Line temp;
815 LIMIT(n, 0, term.bot-orig+1);
816
817 tclearregion(0, orig, term.col-1, orig+n-1);
818
819 for(i = orig; i <= term.bot-n; i++) {
820 temp = term.line[i];
821 term.line[i] = term.line[i+n];
822 term.line[i+n] = temp;
823 }
824 }
825
826 void
827 tnewline(int first_col) {
828 int y = term.c.y;
829 if(y == term.bot)
830 tscrollup(term.top, 1);
831 else
832 y++;
833 tmoveto(first_col ? 0 : term.c.x, y);
834 }
835
836 void
837 csiparse(void) {
838 /* int noarg = 1; */
839 char *p = escseq.buf;
840
841 escseq.narg = 0;
842 if(*p == '?')
843 escseq.priv = 1, p++;
844
845 while(p < escseq.buf+escseq.len) {
846 while(isdigit(*p)) {
847 escseq.arg[escseq.narg] *= 10;
848 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
849 }
850 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
851 escseq.narg++, p++;
852 else {
853 escseq.mode = *p;
854 escseq.narg++;
855 return;
856 }
857 }
858 }
859
860 void
861 tmoveto(int x, int y) {
862 LIMIT(x, 0, term.col-1);
863 LIMIT(y, 0, term.row-1);
864 term.c.state &= ~CURSOR_WRAPNEXT;
865 term.c.x = x;
866 term.c.y = y;
867 }
868
869 void
870 tsetchar(char *c) {
871 term.line[term.c.y][term.c.x] = term.c.attr;
872 memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
873 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
874 }
875
876 void
877 tclearregion(int x1, int y1, int x2, int y2) {
878 int x, y, temp;
879
880 if(x1 > x2)
881 temp = x1, x1 = x2, x2 = temp;
882 if(y1 > y2)
883 temp = y1, y1 = y2, y2 = temp;
884
885 LIMIT(x1, 0, term.col-1);
886 LIMIT(x2, 0, term.col-1);
887 LIMIT(y1, 0, term.row-1);
888 LIMIT(y2, 0, term.row-1);
889
890 for(y = y1; y <= y2; y++)
891 for(x = x1; x <= x2; x++)
892 term.line[y][x].state = 0;
893 }
894
895 void
896 tdeletechar(int n) {
897 int src = term.c.x + n;
898 int dst = term.c.x;
899 int size = term.col - src;
900
901 if(src >= term.col) {
902 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
903 return;
904 }
905 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
906 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
907 }
908
909 void
910 tinsertblank(int n) {
911 int src = term.c.x;
912 int dst = src + n;
913 int size = term.col - dst;
914
915 if(dst >= term.col) {
916 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
917 return;
918 }
919 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
920 tclearregion(src, term.c.y, dst - 1, term.c.y);
921 }
922
923 void
924 tinsertblankline(int n) {
925 if(term.c.y < term.top || term.c.y > term.bot)
926 return;
927
928 tscrolldown(term.c.y, n);
929 }
930
931 void
932 tdeleteline(int n) {
933 if(term.c.y < term.top || term.c.y > term.bot)
934 return;
935
936 tscrollup(term.c.y, n);
937 }
938
939 void
940 tsetattr(int *attr, int l) {
941 int i;
942
943 for(i = 0; i < l; i++) {
944 switch(attr[i]) {
945 case 0:
946 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
947 term.c.attr.fg = DefaultFG;
948 term.c.attr.bg = DefaultBG;
949 break;
950 case 1:
951 term.c.attr.mode |= ATTR_BOLD;
952 break;
953 case 4:
954 term.c.attr.mode |= ATTR_UNDERLINE;
955 break;
956 case 7:
957 term.c.attr.mode |= ATTR_REVERSE;
958 break;
959 case 22:
960 term.c.attr.mode &= ~ATTR_BOLD;
961 break;
962 case 24:
963 term.c.attr.mode &= ~ATTR_UNDERLINE;
964 break;
965 case 27:
966 term.c.attr.mode &= ~ATTR_REVERSE;
967 break;
968 case 38:
969 if(i + 2 < l && attr[i + 1] == 5) {
970 i += 2;
971 if(BETWEEN(attr[i], 0, 255))
972 term.c.attr.fg = attr[i];
973 else
974 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
975 }
976 else
977 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
978 break;
979 case 39:
980 term.c.attr.fg = DefaultFG;
981 break;
982 case 48:
983 if(i + 2 < l && attr[i + 1] == 5) {
984 i += 2;
985 if(BETWEEN(attr[i], 0, 255))
986 term.c.attr.bg = attr[i];
987 else
988 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
989 }
990 else
991 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
992 break;
993 case 49:
994 term.c.attr.bg = DefaultBG;
995 break;
996 default:
997 if(BETWEEN(attr[i], 30, 37))
998 term.c.attr.fg = attr[i] - 30;
999 else if(BETWEEN(attr[i], 40, 47))
1000 term.c.attr.bg = attr[i] - 40;
1001 else if(BETWEEN(attr[i], 90, 97))
1002 term.c.attr.fg = attr[i] - 90 + 8;
1003 else if(BETWEEN(attr[i], 100, 107))
1004 term.c.attr.fg = attr[i] - 100 + 8;
1005 else
1006 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
1007
1008 break;
1009 }
1010 }
1011 }
1012
1013 void
1014 tsetscroll(int t, int b) {
1015 int temp;
1016
1017 LIMIT(t, 0, term.row-1);
1018 LIMIT(b, 0, term.row-1);
1019 if(t > b) {
1020 temp = t;
1021 t = b;
1022 b = temp;
1023 }
1024 term.top = t;
1025 term.bot = b;
1026 }
1027
1028 void
1029 csihandle(void) {
1030 switch(escseq.mode) {
1031 default:
1032 unknown:
1033 fprintf(stderr, "erresc: unknown csi ");
1034 csidump();
1035 /* die(""); */
1036 break;
1037 case '@': /* ICH -- Insert <n> blank char */
1038 DEFAULT(escseq.arg[0], 1);
1039 tinsertblank(escseq.arg[0]);
1040 break;
1041 case 'A': /* CUU -- Cursor <n> Up */
1042 case 'e':
1043 DEFAULT(escseq.arg[0], 1);
1044 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
1045 break;
1046 case 'B': /* CUD -- Cursor <n> Down */
1047 DEFAULT(escseq.arg[0], 1);
1048 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
1049 break;
1050 case 'C': /* CUF -- Cursor <n> Forward */
1051 case 'a':
1052 DEFAULT(escseq.arg[0], 1);
1053 tmoveto(term.c.x+escseq.arg[0], term.c.y);
1054 break;
1055 case 'D': /* CUB -- Cursor <n> Backward */
1056 DEFAULT(escseq.arg[0], 1);
1057 tmoveto(term.c.x-escseq.arg[0], term.c.y);
1058 break;
1059 case 'E': /* CNL -- Cursor <n> Down and first col */
1060 DEFAULT(escseq.arg[0], 1);
1061 tmoveto(0, term.c.y+escseq.arg[0]);
1062 break;
1063 case 'F': /* CPL -- Cursor <n> Up and first col */
1064 DEFAULT(escseq.arg[0], 1);
1065 tmoveto(0, term.c.y-escseq.arg[0]);
1066 break;
1067 case 'G': /* CHA -- Move to <col> */
1068 case '`': /* XXX: HPA -- same? */
1069 DEFAULT(escseq.arg[0], 1);
1070 tmoveto(escseq.arg[0]-1, term.c.y);
1071 break;
1072 case 'H': /* CUP -- Move to <row> <col> */
1073 case 'f': /* XXX: HVP -- same? */
1074 DEFAULT(escseq.arg[0], 1);
1075 DEFAULT(escseq.arg[1], 1);
1076 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
1077 break;
1078 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
1079 case 'J': /* ED -- Clear screen */
1080 switch(escseq.arg[0]) {
1081 case 0: /* below */
1082 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1083 if(term.c.y < term.row-1)
1084 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1085 break;
1086 case 1: /* above */
1087 if(term.c.y > 1)
1088 tclearregion(0, 0, term.col-1, term.c.y-1);
1089 tclearregion(0, term.c.y, term.c.x, term.c.y);
1090 break;
1091 case 2: /* all */
1092 tclearregion(0, 0, term.col-1, term.row-1);
1093 break;
1094 default:
1095 goto unknown;
1096 }
1097 break;
1098 case 'K': /* EL -- Clear line */
1099 switch(escseq.arg[0]) {
1100 case 0: /* right */
1101 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1102 break;
1103 case 1: /* left */
1104 tclearregion(0, term.c.y, term.c.x, term.c.y);
1105 break;
1106 case 2: /* all */
1107 tclearregion(0, term.c.y, term.col-1, term.c.y);
1108 break;
1109 }
1110 break;
1111 case 'S': /* SU -- Scroll <n> line up */
1112 DEFAULT(escseq.arg[0], 1);
1113 tscrollup(term.top, escseq.arg[0]);
1114 break;
1115 case 'T': /* SD -- Scroll <n> line down */
1116 DEFAULT(escseq.arg[0], 1);
1117 tscrolldown(term.top, escseq.arg[0]);
1118 break;
1119 case 'L': /* IL -- Insert <n> blank lines */
1120 DEFAULT(escseq.arg[0], 1);
1121 tinsertblankline(escseq.arg[0]);
1122 break;
1123 case 'l': /* RM -- Reset Mode */
1124 if(escseq.priv) {
1125 switch(escseq.arg[0]) {
1126 case 1:
1127 term.mode &= ~MODE_APPKEYPAD;
1128 break;
1129 case 5: /* DECSCNM -- Remove reverse video */
1130 if(IS_SET(MODE_REVERSE)) {
1131 term.mode &= ~MODE_REVERSE;
1132 draw();
1133 }
1134 break;
1135 case 7:
1136 term.mode &= ~MODE_WRAP;
1137 break;
1138 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1139 break;
1140 case 20:
1141 term.mode &= ~MODE_CRLF;
1142 break;
1143 case 25:
1144 term.c.state |= CURSOR_HIDE;
1145 break;
1146 case 1000: /* disable X11 xterm mouse reporting */
1147 term.mode &= ~MODE_MOUSEBTN;
1148 break;
1149 case 1002:
1150 term.mode &= ~MODE_MOUSEMOTION;
1151 break;
1152 case 1049: /* = 1047 and 1048 */
1153 case 47:
1154 case 1047:
1155 if(IS_SET(MODE_ALTSCREEN)) {
1156 tclearregion(0, 0, term.col-1, term.row-1);
1157 tswapscreen();
1158 }
1159 if(escseq.arg[0] != 1049)
1160 break;
1161 case 1048:
1162 tcursor(CURSOR_LOAD);
1163 break;
1164 default:
1165 goto unknown;
1166 }
1167 } else {
1168 switch(escseq.arg[0]) {
1169 case 4:
1170 term.mode &= ~MODE_INSERT;
1171 break;
1172 default:
1173 goto unknown;
1174 }
1175 }
1176 break;
1177 case 'M': /* DL -- Delete <n> lines */
1178 DEFAULT(escseq.arg[0], 1);
1179 tdeleteline(escseq.arg[0]);
1180 break;
1181 case 'X': /* ECH -- Erase <n> char */
1182 DEFAULT(escseq.arg[0], 1);
1183 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1184 break;
1185 case 'P': /* DCH -- Delete <n> char */
1186 DEFAULT(escseq.arg[0], 1);
1187 tdeletechar(escseq.arg[0]);
1188 break;
1189 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1190 case 'd': /* VPA -- Move to <row> */
1191 DEFAULT(escseq.arg[0], 1);
1192 tmoveto(term.c.x, escseq.arg[0]-1);
1193 break;
1194 case 'h': /* SM -- Set terminal mode */
1195 if(escseq.priv) {
1196 switch(escseq.arg[0]) {
1197 case 1:
1198 term.mode |= MODE_APPKEYPAD;
1199 break;
1200 case 5: /* DECSCNM -- Reverve video */
1201 if(!IS_SET(MODE_REVERSE)) {
1202 term.mode |= MODE_REVERSE;
1203 draw();
1204 }
1205 break;
1206 case 7:
1207 term.mode |= MODE_WRAP;
1208 break;
1209 case 20:
1210 term.mode |= MODE_CRLF;
1211 break;
1212 case 12: /* att610 -- Start blinking cursor (IGNORED) */
1213 /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1214 if(escseq.narg > 1 && escseq.arg[1] != 25)
1215 break;
1216 case 25:
1217 term.c.state &= ~CURSOR_HIDE;
1218 break;
1219 case 1000: /* 1000,1002: enable xterm mouse report */
1220 term.mode |= MODE_MOUSEBTN;
1221 break;
1222 case 1002:
1223 term.mode |= MODE_MOUSEMOTION;
1224 break;
1225 case 1049: /* = 1047 and 1048 */
1226 case 47:
1227 case 1047:
1228 if(IS_SET(MODE_ALTSCREEN))
1229 tclearregion(0, 0, term.col-1, term.row-1);
1230 else
1231 tswapscreen();
1232 if(escseq.arg[0] != 1049)
1233 break;
1234 case 1048:
1235 tcursor(CURSOR_SAVE);
1236 break;
1237 default: goto unknown;
1238 }
1239 } else {
1240 switch(escseq.arg[0]) {
1241 case 4:
1242 term.mode |= MODE_INSERT;
1243 break;
1244 default: goto unknown;
1245 }
1246 };
1247 break;
1248 case 'm': /* SGR -- Terminal attribute (color) */
1249 tsetattr(escseq.arg, escseq.narg);
1250 break;
1251 case 'r': /* DECSTBM -- Set Scrolling Region */
1252 if(escseq.priv)
1253 goto unknown;
1254 else {
1255 DEFAULT(escseq.arg[0], 1);
1256 DEFAULT(escseq.arg[1], term.row);
1257 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1258 tmoveto(0, 0);
1259 }
1260 break;
1261 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1262 tcursor(CURSOR_SAVE);
1263 break;
1264 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1265 tcursor(CURSOR_LOAD);
1266 break;
1267 }
1268 }
1269
1270 void
1271 csidump(void) {
1272 int i;
1273 printf("ESC [ %s", escseq.priv ? "? " : "");
1274 if(escseq.narg)
1275 for(i = 0; i < escseq.narg; i++)
1276 printf("%d ", escseq.arg[i]);
1277 if(escseq.mode)
1278 putchar(escseq.mode);
1279 putchar('\n');
1280 }
1281
1282 void
1283 csireset(void) {
1284 memset(&escseq, 0, sizeof(escseq));
1285 }
1286
1287 void
1288 tputtab(void) {
1289 int space = TAB - term.c.x % TAB;
1290 tmoveto(term.c.x + space, term.c.y);
1291 }
1292
1293 void
1294 tputc(char *c) {
1295 char ascii = *c;
1296 if(term.esc & ESC_START) {
1297 if(term.esc & ESC_CSI) {
1298 escseq.buf[escseq.len++] = ascii;
1299 if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1300 term.esc = 0;
1301 csiparse(), csihandle();
1302 }
1303 /* TODO: handle other OSC */
1304 } else if(term.esc & ESC_OSC) {
1305 if(ascii == ';') {
1306 term.titlelen = 0;
1307 term.esc = ESC_START | ESC_TITLE;
1308 }
1309 } else if(term.esc & ESC_TITLE) {
1310 if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1311 term.esc = 0;
1312 term.title[term.titlelen] = '\0';
1313 XStoreName(xw.dpy, xw.win, term.title);
1314 } else {
1315 term.title[term.titlelen++] = ascii;
1316 }
1317 } else if(term.esc & ESC_ALTCHARSET) {
1318 switch(ascii) {
1319 case '0': /* Line drawing crap */
1320 term.c.attr.mode |= ATTR_GFX;
1321 break;
1322 case 'B': /* Back to regular text */
1323 term.c.attr.mode &= ~ATTR_GFX;
1324 break;
1325 default:
1326 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1327 }
1328 term.esc = 0;
1329 } else {
1330 switch(ascii) {
1331 case '[':
1332 term.esc |= ESC_CSI;
1333 break;
1334 case ']':
1335 term.esc |= ESC_OSC;
1336 break;
1337 case '(':
1338 term.esc |= ESC_ALTCHARSET;
1339 break;
1340 case 'D': /* IND -- Linefeed */
1341 if(term.c.y == term.bot)
1342 tscrollup(term.top, 1);
1343 else
1344 tmoveto(term.c.x, term.c.y+1);
1345 term.esc = 0;
1346 break;
1347 case 'E': /* NEL -- Next line */
1348 tnewline(1); /* always go to first col */
1349 term.esc = 0;
1350 break;
1351 case 'M': /* RI -- Reverse index */
1352 if(term.c.y == term.top)
1353 tscrolldown(term.top, 1);
1354 else
1355 tmoveto(term.c.x, term.c.y-1);
1356 term.esc = 0;
1357 break;
1358 case 'c': /* RIS -- Reset to inital state */
1359 treset();
1360 term.esc = 0;
1361 break;
1362 case '=': /* DECPAM -- Application keypad */
1363 term.mode |= MODE_APPKEYPAD;
1364 term.esc = 0;
1365 break;
1366 case '>': /* DECPNM -- Normal keypad */
1367 term.mode &= ~MODE_APPKEYPAD;
1368 term.esc = 0;
1369 break;
1370 case '7': /* DECSC -- Save Cursor */
1371 tcursor(CURSOR_SAVE);
1372 term.esc = 0;
1373 break;
1374 case '8': /* DECRC -- Restore Cursor */
1375 tcursor(CURSOR_LOAD);
1376 term.esc = 0;
1377 break;
1378 default:
1379 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1380 (unsigned char) ascii, isprint(ascii)?ascii:'.');
1381 term.esc = 0;
1382 }
1383 }
1384 } else {
1385 switch(ascii) {
1386 case '\t':
1387 tputtab();
1388 break;
1389 case '\b':
1390 tmoveto(term.c.x-1, term.c.y);
1391 break;
1392 case '\r':
1393 tmoveto(0, term.c.y);
1394 break;
1395 case '\f':
1396 case '\v':
1397 case '\n':
1398 /* go to first col if the mode is set */
1399 tnewline(IS_SET(MODE_CRLF));
1400 break;
1401 case '\a':
1402 if(!(xw.state & WIN_FOCUSED))
1403 xseturgency(1);
1404 break;
1405 case '\033':
1406 csireset();
1407 term.esc = ESC_START;
1408 break;
1409 default:
1410 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1411 tnewline(1); /* always go to first col */
1412 tsetchar(c);
1413 if(term.c.x+1 < term.col)
1414 tmoveto(term.c.x+1, term.c.y);
1415 else
1416 term.c.state |= CURSOR_WRAPNEXT;
1417 }
1418 }
1419 }
1420
1421 int
1422 tresize(int col, int row) {
1423 int i, x;
1424 int minrow = MIN(row, term.row);
1425 int mincol = MIN(col, term.col);
1426 int slide = term.c.y - row + 1;
1427
1428 if(col < 1 || row < 1)
1429 return 0;
1430
1431 /* free unneeded rows */
1432 i = 0;
1433 if(slide > 0) {
1434 /* slide screen to keep cursor where we expect it -
1435 * tscrollup would work here, but we can optimize to
1436 * memmove because we're freeing the earlier lines */
1437 for(/* i = 0 */; i < slide; i++) {
1438 free(term.line[i]);
1439 free(term.alt[i]);
1440 }
1441 memmove(term.line, term.line + slide, row * sizeof(Line));
1442 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1443 }
1444 for(i += row; i < term.row; i++) {
1445 free(term.line[i]);
1446 free(term.alt[i]);
1447 }
1448
1449 /* resize to new height */
1450 term.line = realloc(term.line, row * sizeof(Line));
1451 term.alt = realloc(term.alt, row * sizeof(Line));
1452
1453 /* resize each row to new width, zero-pad if needed */
1454 for(i = 0; i < minrow; i++) {
1455 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1456 term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
1457 for(x = mincol; x < col; x++) {
1458 term.line[i][x].state = 0;
1459 term.alt[i][x].state = 0;
1460 }
1461 }
1462
1463 /* allocate any new rows */
1464 for(/* i == minrow */; i < row; i++) {
1465 term.line[i] = calloc(col, sizeof(Glyph));
1466 term.alt [i] = calloc(col, sizeof(Glyph));
1467 }
1468
1469 /* update terminal size */
1470 term.col = col, term.row = row;
1471 /* make use of the LIMIT in tmoveto */
1472 tmoveto(term.c.x, term.c.y);
1473 /* reset scrolling region */
1474 tsetscroll(0, row-1);
1475 return (slide > 0);
1476 }
1477
1478 void
1479 xresize(int col, int row) {
1480 Pixmap newbuf;
1481 int oldw, oldh;
1482
1483 oldw = xw.bufw;
1484 oldh = xw.bufh;
1485 xw.bufw = MAX(1, col * xw.cw);
1486 xw.bufh = MAX(1, row * xw.ch);
1487 newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1488 XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1489 XFreePixmap(xw.dpy, xw.buf);
1490 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1491 if(xw.bufw > oldw)
1492 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1493 xw.bufw-oldw, MIN(xw.bufh, oldh));
1494 else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1495 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1496 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1497 False);
1498 if(xw.bufh > oldh)
1499 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1500 xw.bufw, xw.bufh-oldh);
1501 else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1502 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1503 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1504 False);
1505 xw.buf = newbuf;
1506 }
1507
1508 void
1509 xloadcols(void) {
1510 int i, r, g, b;
1511 XColor color;
1512 unsigned long white = WhitePixel(xw.dpy, xw.scr);
1513
1514 for(i = 0; i < 16; i++) {
1515 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1516 dc.col[i] = white;
1517 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1518 } else
1519 dc.col[i] = color.pixel;
1520 }
1521
1522 /* same colors as xterm */
1523 for(r = 0; r < 6; r++)
1524 for(g = 0; g < 6; g++)
1525 for(b = 0; b < 6; b++) {
1526 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1527 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1528 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1529 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1530 dc.col[i] = white;
1531 fprintf(stderr, "Could not allocate color %d\n", i);
1532 } else
1533 dc.col[i] = color.pixel;
1534 i++;
1535 }
1536
1537 for(r = 0; r < 24; r++, i++) {
1538 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1539 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1540 dc.col[i] = white;
1541 fprintf(stderr, "Could not allocate color %d\n", i);
1542 } else
1543 dc.col[i] = color.pixel;
1544 }
1545 }
1546
1547 void
1548 xclear(int x1, int y1, int x2, int y2) {
1549 XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1550 XFillRectangle(xw.dpy, xw.buf, dc.gc,
1551 x1 * xw.cw, y1 * xw.ch,
1552 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1553 }
1554
1555 void
1556 xhints(void) {
1557 XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1558 XWMHints wm = {.flags = InputHint, .input = 1};
1559 XSizeHints size = {
1560 .flags = PSize | PResizeInc | PBaseSize,
1561 .height = xw.h,
1562 .width = xw.w,
1563 .height_inc = xw.ch,
1564 .width_inc = xw.cw,
1565 .base_height = 2*BORDER,
1566 .base_width = 2*BORDER,
1567 };
1568 XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1569 }
1570
1571 XFontSet
1572 xinitfont(char *fontstr) {
1573 XFontSet set;
1574 char *def, **missing;
1575 int n;
1576
1577 missing = NULL;
1578 set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1579 if(missing) {
1580 while(n--)
1581 fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1582 XFreeStringList(missing);
1583 }
1584 return set;
1585 }
1586
1587 void
1588 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1589 XFontStruct **xfonts;
1590 char **font_names;
1591 int i, n;
1592
1593 *ascent = *descent = *lbearing = *rbearing = 0;
1594 n = XFontsOfFontSet(set, &xfonts, &font_names);
1595 for(i = 0; i < n; i++) {
1596 *ascent = MAX(*ascent, (*xfonts)->ascent);
1597 *descent = MAX(*descent, (*xfonts)->descent);
1598 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1599 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1600 xfonts++;
1601 }
1602 }
1603
1604 void
1605 initfonts(char *fontstr, char *bfontstr) {
1606 if((dc.font.set = xinitfont(fontstr)) == NULL ||
1607 (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1608 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1609 xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1610 &dc.font.lbearing, &dc.font.rbearing);
1611 xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1612 &dc.bfont.lbearing, &dc.bfont.rbearing);
1613 }
1614
1615 void
1616 xinit(void) {
1617 XSetWindowAttributes attrs;
1618 Cursor cursor;
1619 Window parent;
1620
1621 if(!(xw.dpy = XOpenDisplay(NULL)))
1622 die("Can't open display\n");
1623 xw.scr = XDefaultScreen(xw.dpy);
1624
1625 /* font */
1626 initfonts(FONT, BOLDFONT);
1627
1628 /* XXX: Assuming same size for bold font */
1629 xw.cw = dc.font.rbearing - dc.font.lbearing;
1630 xw.ch = dc.font.ascent + dc.font.descent;
1631
1632 /* colors */
1633 xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1634 xloadcols();
1635
1636 /* window - default size */
1637 xw.bufh = term.row * xw.ch;
1638 xw.bufw = term.col * xw.cw;
1639 xw.h = xw.bufh + 2*BORDER;
1640 xw.w = xw.bufw + 2*BORDER;
1641
1642 attrs.background_pixel = dc.col[DefaultBG];
1643 attrs.border_pixel = dc.col[DefaultBG];
1644 attrs.bit_gravity = NorthWestGravity;
1645 attrs.event_mask = FocusChangeMask | KeyPressMask
1646 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1647 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask
1648 | EnterWindowMask | LeaveWindowMask;
1649 attrs.colormap = xw.cmap;
1650
1651 parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
1652 xw.win = XCreateWindow(xw.dpy, parent, 0, 0,
1653 xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1654 XDefaultVisual(xw.dpy, xw.scr),
1655 CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1656 | CWColormap,
1657 &attrs);
1658 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1659
1660
1661 /* input methods */
1662 xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1663 xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1664 | XIMStatusNothing, XNClientWindow, xw.win,
1665 XNFocusWindow, xw.win, NULL);
1666 /* gc */
1667 dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1668
1669 /* white cursor, black outline */
1670 cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1671 XDefineCursor(xw.dpy, xw.win, cursor);
1672 XRecolorCursor(xw.dpy, cursor,
1673 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1674 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1675
1676 xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
1677
1678 XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1679 XMapWindow(xw.dpy, xw.win);
1680 xhints();
1681 XSync(xw.dpy, 0);
1682 }
1683
1684 void
1685 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1686 unsigned long xfg = dc.col[base.fg], xbg = dc.col[base.bg], temp;
1687 int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1688 int i;
1689
1690 /* only switch default fg/bg if term is in RV mode */
1691 if(IS_SET(MODE_REVERSE)) {
1692 if(base.fg == DefaultFG)
1693 xfg = dc.col[DefaultBG];
1694 if(base.bg == DefaultBG)
1695 xbg = dc.col[DefaultFG];
1696 }
1697
1698 if(base.mode & ATTR_REVERSE)
1699 temp = xfg, xfg = xbg, xbg = temp;
1700
1701 XSetBackground(xw.dpy, dc.gc, xbg);
1702 XSetForeground(xw.dpy, dc.gc, xfg);
1703
1704 if(base.mode & ATTR_GFX) {
1705 for(i = 0; i < bytelen; i++) {
1706 char c = gfx[(unsigned int)s[i] % 256];
1707 if(c)
1708 s[i] = c;
1709 else if(s[i] > 0x5f)
1710 s[i] -= 0x5f;
1711 }
1712 }
1713
1714 XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1715 dc.gc, winx, winy, s, bytelen);
1716
1717 if(base.mode & ATTR_UNDERLINE)
1718 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1719 }
1720
1721 void
1722 xdrawcursor(void) {
1723 static int oldx = 0;
1724 static int oldy = 0;
1725 int sl;
1726 Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1727
1728 LIMIT(oldx, 0, term.col-1);
1729 LIMIT(oldy, 0, term.row-1);
1730
1731 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1732 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1733
1734 /* remove the old cursor */
1735 if(term.line[oldy][oldx].state & GLYPH_SET) {
1736 sl = utf8size(term.line[oldy][oldx].c);
1737 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1738 } else
1739 xclear(oldx, oldy, oldx, oldy);
1740
1741 /* draw the new one */
1742 if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1743 sl = utf8size(g.c);
1744 if(IS_SET(MODE_REVERSE))
1745 g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
1746 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1747 oldx = term.c.x, oldy = term.c.y;
1748 }
1749 }
1750
1751 void
1752 draw() {
1753 drawregion(0, 0, term.col, term.row);
1754 }
1755
1756 void
1757 drawregion(int x1, int y1, int x2, int y2) {
1758 int ic, ib, x, y, ox, sl;
1759 Glyph base, new;
1760 char buf[DRAW_BUF_SIZ];
1761
1762 if(!(xw.state & WIN_VISIBLE))
1763 return;
1764
1765 xclear(x1, y1, x2-1, y2-1);
1766 for(y = y1; y < y2; y++) {
1767 base = term.line[y][0];
1768 ic = ib = ox = 0;
1769 for(x = x1; x < x2; x++) {
1770 new = term.line[y][x];
1771 if(sel.bx != -1 && *(new.c) && selected(x, y))
1772 new.mode ^= ATTR_REVERSE;
1773 if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1774 ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1775 xdraws(buf, base, ox, y, ic, ib);
1776 ic = ib = 0;
1777 }
1778 if(new.state & GLYPH_SET) {
1779 if(ib == 0) {
1780 ox = x;
1781 base = new;
1782 }
1783 sl = utf8size(new.c);
1784 memcpy(buf+ib, new.c, sl);
1785 ib += sl;
1786 ++ic;
1787 }
1788 }
1789 if(ib > 0)
1790 xdraws(buf, base, ox, y, ic, ib);
1791 }
1792 xdrawcursor();
1793 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1794 }
1795
1796 void
1797 expose(XEvent *ev) {
1798 XExposeEvent *e = &ev->xexpose;
1799 if(xw.state & WIN_REDRAW) {
1800 if(!e->count) {
1801 xw.state &= ~WIN_REDRAW;
1802 draw();
1803 }
1804 } else
1805 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1806 e->width, e->height, e->x, e->y);
1807 }
1808
1809 void
1810 visibility(XEvent *ev) {
1811 XVisibilityEvent *e = &ev->xvisibility;
1812 if(e->state == VisibilityFullyObscured)
1813 xw.state &= ~WIN_VISIBLE;
1814 else if(!(xw.state & WIN_VISIBLE))
1815 /* need a full redraw for next Expose, not just a buf copy */
1816 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1817 }
1818
1819 void
1820 unmap(XEvent *ev) {
1821 xw.state &= ~WIN_VISIBLE;
1822 }
1823
1824 void
1825 xseturgency(int add) {
1826 XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1827 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1828 XSetWMHints(xw.dpy, xw.win, h);
1829 XFree(h);
1830 }
1831
1832 void
1833 focus(XEvent *ev) {
1834 if(ev->type == FocusIn) {
1835 xw.state |= WIN_FOCUSED;
1836 xseturgency(0);
1837 } else
1838 xw.state &= ~WIN_FOCUSED;
1839 draw();
1840 }
1841
1842 char*
1843 kmap(KeySym k, unsigned int state) {
1844 int i;
1845 state &= ~Mod2Mask;
1846 for(i = 0; i < LEN(key); i++) {
1847 unsigned int mask = key[i].mask;
1848 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
1849 return (char*)key[i].s;
1850 }
1851 return NULL;
1852 }
1853
1854 void
1855 kpress(XEvent *ev) {
1856 XKeyEvent *e = &ev->xkey;
1857 KeySym ksym;
1858 char buf[32];
1859 char *customkey;
1860 int len;
1861 int meta;
1862 int shift;
1863 Status status;
1864
1865 meta = e->state & Mod1Mask;
1866 shift = e->state & ShiftMask;
1867 len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1868
1869 /* 1. custom keys from config.h */
1870 if((customkey = kmap(ksym, e->state)))
1871 ttywrite(customkey, strlen(customkey));
1872 /* 2. hardcoded (overrides X lookup) */
1873 else
1874 switch(ksym) {
1875 case XK_Up:
1876 case XK_Down:
1877 case XK_Left:
1878 case XK_Right:
1879 /* XXX: shift up/down doesn't work */
1880 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
1881 ttywrite(buf, 3);
1882 break;
1883 case XK_Insert:
1884 if(shift)
1885 selpaste();
1886 break;
1887 case XK_Return:
1888 if(IS_SET(MODE_CRLF))
1889 ttywrite("\r\n", 2);
1890 else
1891 ttywrite("\r", 1);
1892 break;
1893 /* 3. X lookup */
1894 default:
1895 if(len > 0) {
1896 if(meta && len == 1)
1897 ttywrite("\033", 1);
1898 ttywrite(buf, len);
1899 }
1900 break;
1901 }
1902 }
1903
1904 void
1905 cmessage(XEvent *e) {
1906 /* See xembed specs
1907 http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
1908 if (e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
1909 if (e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
1910 xw.state |= WIN_FOCUSED;
1911 xseturgency(0);
1912 } else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
1913 xw.state &= ~WIN_FOCUSED;
1914 }
1915 draw();
1916 }
1917 }
1918
1919 void
1920 resize(XEvent *e) {
1921 int col, row;
1922
1923 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1924 return;
1925
1926 xw.w = e->xconfigure.width;
1927 xw.h = e->xconfigure.height;
1928 col = (xw.w - 2*BORDER) / xw.cw;
1929 row = (xw.h - 2*BORDER) / xw.ch;
1930 if(col == term.col && row == term.row)
1931 return;
1932 if(tresize(col, row))
1933 draw();
1934 ttyresize(col, row);
1935 xresize(col, row);
1936 }
1937
1938 void
1939 run(void) {
1940 XEvent ev;
1941 fd_set rfd;
1942 int xfd = XConnectionNumber(xw.dpy);
1943
1944 for(;;) {
1945 FD_ZERO(&rfd);
1946 FD_SET(cmdfd, &rfd);
1947 FD_SET(xfd, &rfd);
1948 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1949 if(errno == EINTR)
1950 continue;
1951 die("select failed: %s\n", SERRNO);
1952 }
1953 if(FD_ISSET(cmdfd, &rfd)) {
1954 ttyread();
1955 draw();
1956 }
1957 while(XPending(xw.dpy)) {
1958 XNextEvent(xw.dpy, &ev);
1959 if(XFilterEvent(&ev, xw.win))
1960 continue;
1961 if(handler[ev.type])
1962 (handler[ev.type])(&ev);
1963 }
1964 }
1965 }
1966
1967 int
1968 main(int argc, char *argv[]) {
1969 int i;
1970
1971 for(i = 1; i < argc; i++) {
1972 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1973 case 't':
1974 if(++i < argc) opt_title = argv[i];
1975 break;
1976 case 'c':
1977 if(++i < argc) opt_class = argv[i];
1978 break;
1979 case 'w':
1980 if(++i < argc) opt_embed = argv[i];
1981 break;
1982 case 'e':
1983 /* eat every remaining arguments */
1984 if(++i < argc) opt_cmd = &argv[i];
1985 goto run;
1986 case 'v':
1987 default:
1988 die(USAGE);
1989 }
1990 }
1991
1992 run:
1993 setlocale(LC_CTYPE, "");
1994 tnew(80, 24);
1995 ttynew();
1996 xinit();
1997 selinit();
1998 run();
1999 return 0;
2000 }