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applied parts of "anonymous" cleanup patch.
[st.git] / st.c
1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <locale.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/ioctl.h>
14 #include <sys/select.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <X11/Xatom.h>
20 #include <X11/Xlib.h>
21 #include <X11/Xutil.h>
22 #include <X11/cursorfont.h>
23 #include <X11/keysym.h>
24
25 #include <sys/time.h>
26 #include <time.h>
27
28 #if defined(__linux)
29 #include <pty.h>
30 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
31 #include <util.h>
32 #elif defined(__FreeBSD__) || defined(__DragonFly__)
33 #include <libutil.h>
34 #endif
35
36 #define USAGE \
37 "st-" VERSION ", (c) 2010-2011 st engineers\n" \
38 "usage: st [-t title] [-c class] [-v] [-e command...]\n"
39
40 /* Arbitrary sizes */
41 #define ESC_TITLE_SIZ 256
42 #define ESC_BUF_SIZ 256
43 #define ESC_ARG_SIZ 16
44 #define DRAW_BUF_SIZ 1024
45 #define UTF_SIZ 4
46
47 #define SERRNO strerror(errno)
48 #define MIN(a, b) ((a) < (b) ? (a) : (b))
49 #define MAX(a, b) ((a) < (b) ? (b) : (a))
50 #define LEN(a) (sizeof(a) / sizeof(a[0]))
51 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
52 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
53 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
54 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
55 #define IS_SET(flag) (term.mode & (flag))
56 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
57 #define X2COL(x) (((x) - BORDER)/xw.cw)
58 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
59
60 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
61 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
62 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
63 CURSOR_SAVE, CURSOR_LOAD };
64 enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
65 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
66 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8,
67 MODE_CRLF=16, MODE_MOUSEBTN=32, MODE_MOUSEMOTION=64, MODE_MOUSE=32|64, MODE_REVERSE=128 };
68 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
69 enum { WIN_VISIBLE=1, WIN_REDRAW=2, WIN_FOCUSED=4 };
70
71 #undef B0
72 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
73
74 typedef struct {
75 char c[UTF_SIZ]; /* character code */
76 char mode; /* attribute flags */
77 int fg; /* foreground */
78 int bg; /* background */
79 char state; /* state flags */
80 } Glyph;
81
82 typedef Glyph* Line;
83
84 typedef struct {
85 Glyph attr; /* current char attributes */
86 int x;
87 int y;
88 char state;
89 } TCursor;
90
91 /* CSI Escape sequence structs */
92 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
93 typedef struct {
94 char buf[ESC_BUF_SIZ]; /* raw string */
95 int len; /* raw string length */
96 char priv;
97 int arg[ESC_ARG_SIZ];
98 int narg; /* nb of args */
99 char mode;
100 } CSIEscape;
101
102 /* Internal representation of the screen */
103 typedef struct {
104 int row; /* nb row */
105 int col; /* nb col */
106 Line* line; /* screen */
107 Line* alt; /* alternate screen */
108 TCursor c; /* cursor */
109 int top; /* top scroll limit */
110 int bot; /* bottom scroll limit */
111 int mode; /* terminal mode flags */
112 int esc; /* escape state flags */
113 char title[ESC_TITLE_SIZ];
114 int titlelen;
115 } Term;
116
117 /* Purely graphic info */
118 typedef struct {
119 Display* dpy;
120 Colormap cmap;
121 Window win;
122 Pixmap buf;
123 XIM xim;
124 XIC xic;
125 int scr;
126 int w; /* window width */
127 int h; /* window height */
128 int bufw; /* pixmap width */
129 int bufh; /* pixmap height */
130 int ch; /* char height */
131 int cw; /* char width */
132 char state; /* focus, redraw, visible */
133 } XWindow;
134
135 typedef struct {
136 KeySym k;
137 unsigned int mask;
138 char s[ESC_BUF_SIZ];
139 } Key;
140
141 /* Drawing Context */
142 typedef struct {
143 unsigned long col[256];
144 GC gc;
145 struct {
146 int ascent;
147 int descent;
148 short lbearing;
149 short rbearing;
150 XFontSet set;
151 } font, bfont;
152 } DC;
153
154 /* TODO: use better name for vars... */
155 typedef struct {
156 int mode;
157 int bx, by;
158 int ex, ey;
159 struct {int x, y;} b, e;
160 char *clip;
161 Atom xtarget;
162 struct timeval tclick1;
163 struct timeval tclick2;
164 } Selection;
165
166 #include "config.h"
167
168 static void die(const char*, ...);
169 static void draw(void);
170 static void drawregion(int, int, int, int);
171 static void execsh(void);
172 static void sigchld(int);
173 static void run(void);
174
175 static void csidump(void);
176 static void csihandle(void);
177 static void csiparse(void);
178 static void csireset(void);
179
180 static void tclearregion(int, int, int, int);
181 static void tcursor(int);
182 static void tdeletechar(int);
183 static void tdeleteline(int);
184 static void tinsertblank(int);
185 static void tinsertblankline(int);
186 static void tmoveto(int, int);
187 static void tnew(int, int);
188 static void tnewline(int);
189 static void tputtab(void);
190 static void tputc(char*);
191 static void treset(void);
192 static int tresize(int, int);
193 static void tscrollup(int, int);
194 static void tscrolldown(int, int);
195 static void tsetattr(int*, int);
196 static void tsetchar(char*);
197 static void tsetscroll(int, int);
198 static void tswapscreen(void);
199
200 static void ttynew(void);
201 static void ttyread(void);
202 static void ttyresize(int, int);
203 static void ttywrite(const char *, size_t);
204
205 static void xdraws(char *, Glyph, int, int, int, int);
206 static void xhints(void);
207 static void xclear(int, int, int, int);
208 static void xdrawcursor(void);
209 static void xinit(void);
210 static void xloadcols(void);
211 static void xseturgency(int);
212 static void xsetsel(char*);
213 static void xresize(int, int);
214
215 static void expose(XEvent *);
216 static void visibility(XEvent *);
217 static void unmap(XEvent *);
218 static char* kmap(KeySym, unsigned int state);
219 static void kpress(XEvent *);
220 static void resize(XEvent *);
221 static void focus(XEvent *);
222 static void brelease(XEvent *);
223 static void bpress(XEvent *);
224 static void bmotion(XEvent *);
225 static void selnotify(XEvent *);
226 static void selrequest(XEvent *);
227
228 static void selinit(void);
229 static inline int selected(int, int);
230 static void selcopy(void);
231 static void selpaste();
232
233 static int utf8decode(char *, long *);
234 static int utf8encode(long *, char *);
235 static int utf8size(char *);
236 static int isfullutf8(char *, int);
237
238 static void (*handler[LASTEvent])(XEvent *) = {
239 [KeyPress] = kpress,
240 [ConfigureNotify] = resize,
241 [VisibilityNotify] = visibility,
242 [UnmapNotify] = unmap,
243 [Expose] = expose,
244 [FocusIn] = focus,
245 [FocusOut] = focus,
246 [MotionNotify] = bmotion,
247 [ButtonPress] = bpress,
248 [ButtonRelease] = brelease,
249 [SelectionNotify] = selnotify,
250 [SelectionRequest] = selrequest,
251 };
252
253 /* Globals */
254 static DC dc;
255 static XWindow xw;
256 static Term term;
257 static CSIEscape escseq;
258 static int cmdfd;
259 static pid_t pid;
260 static Selection sel;
261 static char **opt_cmd = NULL;
262 static char *opt_title = NULL;
263 static char *opt_class = NULL;
264
265 int
266 utf8decode(char *s, long *u) {
267 unsigned char c;
268 int i, n, rtn;
269
270 rtn = 1;
271 c = *s;
272 if(~c&B7) { /* 0xxxxxxx */
273 *u = c;
274 return rtn;
275 } else if((c&(B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
276 *u = c&(B4|B3|B2|B1|B0);
277 n = 1;
278 } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
279 *u = c&(B3|B2|B1|B0);
280 n = 2;
281 } else if((c&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
282 *u = c&(B2|B1|B0);
283 n = 3;
284 } else
285 goto invalid;
286 for(i=n,++s; i>0; --i,++rtn,++s) {
287 c = *s;
288 if((c&(B7|B6)) != B7) /* 10xxxxxx */
289 goto invalid;
290 *u <<= 6;
291 *u |= c&(B5|B4|B3|B2|B1|B0);
292 }
293 if((n == 1 && *u < 0x80) ||
294 (n == 2 && *u < 0x800) ||
295 (n == 3 && *u < 0x10000) ||
296 (*u >= 0xD800 && *u <= 0xDFFF))
297 goto invalid;
298 return rtn;
299 invalid:
300 *u = 0xFFFD;
301 return rtn;
302 }
303
304 int
305 utf8encode(long *u, char *s) {
306 unsigned char *sp;
307 unsigned long uc;
308 int i, n;
309
310 sp = (unsigned char*) s;
311 uc = *u;
312 if(uc < 0x80) {
313 *sp = uc; /* 0xxxxxxx */
314 return 1;
315 } else if(*u < 0x800) {
316 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
317 n = 1;
318 } else if(uc < 0x10000) {
319 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
320 n = 2;
321 } else if(uc <= 0x10FFFF) {
322 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
323 n = 3;
324 } else {
325 goto invalid;
326 }
327 for(i=n,++sp; i>0; --i,++sp)
328 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
329 return n+1;
330 invalid:
331 /* U+FFFD */
332 *s++ = '\xEF';
333 *s++ = '\xBF';
334 *s = '\xBD';
335 return 3;
336 }
337
338 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
339 UTF-8 otherwise return 0 */
340 int
341 isfullutf8(char *s, int b) {
342 unsigned char *c1, *c2, *c3;
343
344 c1 = (unsigned char *) s;
345 c2 = (unsigned char *) ++s;
346 c3 = (unsigned char *) ++s;
347 if(b < 1)
348 return 0;
349 else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
350 return 0;
351 else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
352 ((b == 1) ||
353 ((b == 2) && (*c2&(B7|B6)) == B7)))
354 return 0;
355 else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
356 ((b == 1) ||
357 ((b == 2) && (*c2&(B7|B6)) == B7) ||
358 ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
359 return 0;
360 else
361 return 1;
362 }
363
364 int
365 utf8size(char *s) {
366 unsigned char c = *s;
367
368 if(~c&B7)
369 return 1;
370 else if((c&(B7|B6|B5)) == (B7|B6))
371 return 2;
372 else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
373 return 3;
374 else
375 return 4;
376 }
377
378 void
379 selinit(void) {
380 sel.tclick1.tv_sec = 0;
381 sel.tclick1.tv_usec = 0;
382 sel.mode = 0;
383 sel.bx = -1;
384 sel.clip = NULL;
385 sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
386 if(sel.xtarget == None)
387 sel.xtarget = XA_STRING;
388 }
389
390 static inline int
391 selected(int x, int y) {
392 if(sel.ey == y && sel.by == y) {
393 int bx = MIN(sel.bx, sel.ex);
394 int ex = MAX(sel.bx, sel.ex);
395 return BETWEEN(x, bx, ex);
396 }
397 return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
398 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
399 }
400
401 void
402 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
403 if(b)
404 *b = e->xbutton.button;
405
406 *x = X2COL(e->xbutton.x);
407 *y = Y2ROW(e->xbutton.y);
408 sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
409 sel.b.y = MIN(sel.by, sel.ey);
410 sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
411 sel.e.y = MAX(sel.by, sel.ey);
412 }
413
414 void
415 mousereport(XEvent *e) {
416 int x = X2COL(e->xbutton.x);
417 int y = Y2ROW(e->xbutton.y);
418 int button = e->xbutton.button;
419 int state = e->xbutton.state;
420 char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
421 static int ob, ox, oy;
422
423 /* from urxvt */
424 if(e->xbutton.type == MotionNotify) {
425 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
426 return;
427 button = ob + 32;
428 ox = x, oy = y;
429 } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
430 button = 3;
431 } else {
432 button -= Button1;
433 if(button >= 3)
434 button += 64 - 3;
435 if(e->xbutton.type == ButtonPress) {
436 ob = button;
437 ox = x, oy = y;
438 }
439 }
440
441 buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
442 + (state & Mod4Mask ? 8 : 0)
443 + (state & ControlMask ? 16 : 0);
444
445 ttywrite(buf, sizeof(buf));
446 }
447
448 void
449 bpress(XEvent *e) {
450 if(IS_SET(MODE_MOUSE))
451 mousereport(e);
452 else if(e->xbutton.button == Button1) {
453 sel.mode = 1;
454 sel.ex = sel.bx = X2COL(e->xbutton.x);
455 sel.ey = sel.by = Y2ROW(e->xbutton.y);
456 }
457 }
458
459 void
460 selcopy(void) {
461 char *str, *ptr;
462 int x, y, sz, sl, ls = 0;
463
464 if(sel.bx == -1)
465 str = NULL;
466 else {
467 sz = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
468 ptr = str = malloc(sz);
469 for(y = 0; y < term.row; y++) {
470 for(x = 0; x < term.col; x++)
471 if(term.line[y][x].state & GLYPH_SET && (ls = selected(x, y))) {
472 sl = utf8size(term.line[y][x].c);
473 memcpy(ptr, term.line[y][x].c, sl);
474 ptr += sl;
475 }
476 if(ls && y < sel.e.y)
477 *ptr++ = '\n';
478 }
479 *ptr = 0;
480 }
481 xsetsel(str);
482 }
483
484 void
485 selnotify(XEvent *e) {
486 unsigned long nitems, ofs, rem;
487 int format;
488 unsigned char *data;
489 Atom type;
490
491 ofs = 0;
492 do {
493 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
494 False, AnyPropertyType, &type, &format,
495 &nitems, &rem, &data)) {
496 fprintf(stderr, "Clipboard allocation failed\n");
497 return;
498 }
499 ttywrite((const char *) data, nitems * format / 8);
500 XFree(data);
501 /* number of 32-bit chunks returned */
502 ofs += nitems * format / 32;
503 } while(rem > 0);
504 }
505
506 void
507 selpaste() {
508 XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
509 }
510
511 void
512 selrequest(XEvent *e) {
513 XSelectionRequestEvent *xsre;
514 XSelectionEvent xev;
515 Atom xa_targets;
516
517 xsre = (XSelectionRequestEvent *) e;
518 xev.type = SelectionNotify;
519 xev.requestor = xsre->requestor;
520 xev.selection = xsre->selection;
521 xev.target = xsre->target;
522 xev.time = xsre->time;
523 /* reject */
524 xev.property = None;
525
526 xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
527 if(xsre->target == xa_targets) {
528 /* respond with the supported type */
529 Atom string = sel.xtarget;
530 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
531 XA_ATOM, 32, PropModeReplace,
532 (unsigned char *) &string, 1);
533 xev.property = xsre->property;
534 } else if(xsre->target == sel.xtarget) {
535 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
536 xsre->target, 8, PropModeReplace,
537 (unsigned char *) sel.clip, strlen(sel.clip));
538 xev.property = xsre->property;
539 }
540
541 /* all done, send a notification to the listener */
542 if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
543 fprintf(stderr, "Error sending SelectionNotify event\n");
544 }
545
546 void
547 xsetsel(char *str) {
548 /* register the selection for both the clipboard and the primary */
549 Atom clipboard;
550
551 free(sel.clip);
552 sel.clip = str;
553
554 XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
555
556 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
557 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
558
559 XFlush(xw.dpy);
560 }
561
562 void
563 brelease(XEvent *e) {
564 if(IS_SET(MODE_MOUSE)) {
565 mousereport(e);
566 return;
567 }
568 if(e->xbutton.button == Button2)
569 selpaste();
570 else if(e->xbutton.button == Button1) {
571 sel.mode = 0;
572 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
573 if(sel.bx == sel.ex && sel.by == sel.ey) {
574 struct timeval now;
575 sel.bx = -1;
576 gettimeofday(&now, NULL);
577
578 if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
579 /* triple click on the line */
580 sel.b.x = sel.bx = 0;
581 sel.e.x = sel.ex = term.col;
582 sel.b.y = sel.e.y = sel.ey;
583 selcopy();
584 } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
585 /* double click to select word */
586 sel.bx = sel.ex;
587 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
588 term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
589 sel.b.x = sel.bx;
590 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
591 term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
592 sel.e.x = sel.ex;
593 sel.b.y = sel.e.y = sel.ey;
594 selcopy();
595 }
596 } else
597 selcopy();
598 }
599 memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
600 gettimeofday(&sel.tclick1, NULL);
601 draw();
602 }
603
604 void
605 bmotion(XEvent *e) {
606 if(IS_SET(MODE_MOUSE)) {
607 mousereport(e);
608 return;
609 }
610 if(sel.mode) {
611 int oldey = sel.ey, oldex = sel.ex;
612 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
613
614 if(oldey != sel.ey || oldex != sel.ex) {
615 int starty = MIN(oldey, sel.ey);
616 int endy = MAX(oldey, sel.ey);
617 drawregion(0, (starty > 0 ? starty : 0), term.col, (sel.ey < term.row ? endy+1 : term.row));
618 }
619 }
620 }
621
622 void
623 die(const char *errstr, ...) {
624 va_list ap;
625
626 va_start(ap, errstr);
627 vfprintf(stderr, errstr, ap);
628 va_end(ap);
629 exit(EXIT_FAILURE);
630 }
631
632 void
633 execsh(void) {
634 char **args;
635 char *envshell = getenv("SHELL");
636
637 DEFAULT(envshell, "sh");
638 putenv("TERM="TNAME);
639 args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
640 execvp(args[0], args);
641 exit(EXIT_FAILURE);
642 }
643
644 void
645 sigchld(int a) {
646 int stat = 0;
647 if(waitpid(pid, &stat, 0) < 0)
648 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
649 if(WIFEXITED(stat))
650 exit(WEXITSTATUS(stat));
651 else
652 exit(EXIT_FAILURE);
653 }
654
655 void
656 ttynew(void) {
657 int m, s;
658
659 /* seems to work fine on linux, openbsd and freebsd */
660 struct winsize w = {term.row, term.col, 0, 0};
661 if(openpty(&m, &s, NULL, NULL, &w) < 0)
662 die("openpty failed: %s\n", SERRNO);
663
664 switch(pid = fork()) {
665 case -1:
666 die("fork failed\n");
667 break;
668 case 0:
669 setsid(); /* create a new process group */
670 dup2(s, STDIN_FILENO);
671 dup2(s, STDOUT_FILENO);
672 dup2(s, STDERR_FILENO);
673 if(ioctl(s, TIOCSCTTY, NULL) < 0)
674 die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
675 close(s);
676 close(m);
677 execsh();
678 break;
679 default:
680 close(s);
681 cmdfd = m;
682 signal(SIGCHLD, sigchld);
683 }
684 }
685
686 void
687 dump(char c) {
688 static int col;
689 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
690 if(++col % 10 == 0)
691 fprintf(stderr, "\n");
692 }
693
694 void
695 ttyread(void) {
696 static char buf[BUFSIZ];
697 static int buflen = 0;
698 char *ptr;
699 char s[UTF_SIZ];
700 int charsize; /* size of utf8 char in bytes */
701 long utf8c;
702 int ret;
703
704 /* append read bytes to unprocessed bytes */
705 if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
706 die("Couldn't read from shell: %s\n", SERRNO);
707
708 /* process every complete utf8 char */
709 buflen += ret;
710 ptr = buf;
711 while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
712 charsize = utf8decode(ptr, &utf8c);
713 utf8encode(&utf8c, s);
714 tputc(s);
715 ptr += charsize;
716 buflen -= charsize;
717 }
718
719 /* keep any uncomplete utf8 char for the next call */
720 memmove(buf, ptr, buflen);
721 }
722
723 void
724 ttywrite(const char *s, size_t n) {
725 if(write(cmdfd, s, n) == -1)
726 die("write error on tty: %s\n", SERRNO);
727 }
728
729 void
730 ttyresize(int x, int y) {
731 struct winsize w;
732
733 w.ws_row = term.row;
734 w.ws_col = term.col;
735 w.ws_xpixel = w.ws_ypixel = 0;
736 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
737 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
738 }
739
740 void
741 tcursor(int mode) {
742 static TCursor c;
743
744 if(mode == CURSOR_SAVE)
745 c = term.c;
746 else if(mode == CURSOR_LOAD)
747 term.c = c, tmoveto(c.x, c.y);
748 }
749
750 void
751 treset(void) {
752 term.c = (TCursor){{
753 .mode = ATTR_NULL,
754 .fg = DefaultFG,
755 .bg = DefaultBG
756 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
757
758 term.top = 0, term.bot = term.row - 1;
759 term.mode = MODE_WRAP;
760 tclearregion(0, 0, term.col-1, term.row-1);
761 }
762
763 void
764 tnew(int col, int row) {
765 /* set screen size */
766 term.row = row, term.col = col;
767 term.line = malloc(term.row * sizeof(Line));
768 term.alt = malloc(term.row * sizeof(Line));
769 for(row = 0; row < term.row; row++) {
770 term.line[row] = malloc(term.col * sizeof(Glyph));
771 term.alt [row] = malloc(term.col * sizeof(Glyph));
772 }
773 /* setup screen */
774 treset();
775 }
776
777 void
778 tswapscreen(void) {
779 Line* tmp = term.line;
780 term.line = term.alt;
781 term.alt = tmp;
782 term.mode ^= MODE_ALTSCREEN;
783 }
784
785 void
786 tscrolldown(int orig, int n) {
787 int i;
788 Line temp;
789
790 LIMIT(n, 0, term.bot-orig+1);
791
792 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
793
794 for(i = term.bot; i >= orig+n; i--) {
795 temp = term.line[i];
796 term.line[i] = term.line[i-n];
797 term.line[i-n] = temp;
798 }
799 }
800
801 void
802 tscrollup(int orig, int n) {
803 int i;
804 Line temp;
805 LIMIT(n, 0, term.bot-orig+1);
806
807 tclearregion(0, orig, term.col-1, orig+n-1);
808
809 for(i = orig; i <= term.bot-n; i++) {
810 temp = term.line[i];
811 term.line[i] = term.line[i+n];
812 term.line[i+n] = temp;
813 }
814 }
815
816 void
817 tnewline(int first_col) {
818 int y = term.c.y;
819 if(y == term.bot)
820 tscrollup(term.top, 1);
821 else
822 y++;
823 tmoveto(first_col ? 0 : term.c.x, y);
824 }
825
826 void
827 csiparse(void) {
828 /* int noarg = 1; */
829 char *p = escseq.buf;
830
831 escseq.narg = 0;
832 if(*p == '?')
833 escseq.priv = 1, p++;
834
835 while(p < escseq.buf+escseq.len) {
836 while(isdigit(*p)) {
837 escseq.arg[escseq.narg] *= 10;
838 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
839 }
840 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
841 escseq.narg++, p++;
842 else {
843 escseq.mode = *p;
844 escseq.narg++;
845 return;
846 }
847 }
848 }
849
850 void
851 tmoveto(int x, int y) {
852 LIMIT(x, 0, term.col-1);
853 LIMIT(y, 0, term.row-1);
854 term.c.state &= ~CURSOR_WRAPNEXT;
855 term.c.x = x;
856 term.c.y = y;
857 }
858
859 void
860 tsetchar(char *c) {
861 term.line[term.c.y][term.c.x] = term.c.attr;
862 memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
863 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
864 }
865
866 void
867 tclearregion(int x1, int y1, int x2, int y2) {
868 int x, y, temp;
869
870 if(x1 > x2)
871 temp = x1, x1 = x2, x2 = temp;
872 if(y1 > y2)
873 temp = y1, y1 = y2, y2 = temp;
874
875 LIMIT(x1, 0, term.col-1);
876 LIMIT(x2, 0, term.col-1);
877 LIMIT(y1, 0, term.row-1);
878 LIMIT(y2, 0, term.row-1);
879
880 for(y = y1; y <= y2; y++)
881 for(x = x1; x <= x2; x++)
882 term.line[y][x].state = 0;
883 }
884
885 void
886 tdeletechar(int n) {
887 int src = term.c.x + n;
888 int dst = term.c.x;
889 int size = term.col - src;
890
891 if(src >= term.col) {
892 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
893 return;
894 }
895 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
896 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
897 }
898
899 void
900 tinsertblank(int n) {
901 int src = term.c.x;
902 int dst = src + n;
903 int size = term.col - dst;
904
905 if(dst >= term.col) {
906 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
907 return;
908 }
909 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
910 tclearregion(src, term.c.y, dst - 1, term.c.y);
911 }
912
913 void
914 tinsertblankline(int n) {
915 if(term.c.y < term.top || term.c.y > term.bot)
916 return;
917
918 tscrolldown(term.c.y, n);
919 }
920
921 void
922 tdeleteline(int n) {
923 if(term.c.y < term.top || term.c.y > term.bot)
924 return;
925
926 tscrollup(term.c.y, n);
927 }
928
929 void
930 tsetattr(int *attr, int l) {
931 int i;
932
933 for(i = 0; i < l; i++) {
934 switch(attr[i]) {
935 case 0:
936 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
937 term.c.attr.fg = DefaultFG;
938 term.c.attr.bg = DefaultBG;
939 break;
940 case 1:
941 term.c.attr.mode |= ATTR_BOLD;
942 break;
943 case 4:
944 term.c.attr.mode |= ATTR_UNDERLINE;
945 break;
946 case 7:
947 term.c.attr.mode |= ATTR_REVERSE;
948 break;
949 case 22:
950 term.c.attr.mode &= ~ATTR_BOLD;
951 break;
952 case 24:
953 term.c.attr.mode &= ~ATTR_UNDERLINE;
954 break;
955 case 27:
956 term.c.attr.mode &= ~ATTR_REVERSE;
957 break;
958 case 38:
959 if(i + 2 < l && attr[i + 1] == 5) {
960 i += 2;
961 if(BETWEEN(attr[i], 0, 255))
962 term.c.attr.fg = attr[i];
963 else
964 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
965 }
966 else
967 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
968 break;
969 case 39:
970 term.c.attr.fg = DefaultFG;
971 break;
972 case 48:
973 if(i + 2 < l && attr[i + 1] == 5) {
974 i += 2;
975 if(BETWEEN(attr[i], 0, 255))
976 term.c.attr.bg = attr[i];
977 else
978 fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
979 }
980 else
981 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
982 break;
983 case 49:
984 term.c.attr.bg = DefaultBG;
985 break;
986 default:
987 if(BETWEEN(attr[i], 30, 37))
988 term.c.attr.fg = attr[i] - 30;
989 else if(BETWEEN(attr[i], 40, 47))
990 term.c.attr.bg = attr[i] - 40;
991 else if(BETWEEN(attr[i], 90, 97))
992 term.c.attr.fg = attr[i] - 90 + 8;
993 else if(BETWEEN(attr[i], 100, 107))
994 term.c.attr.fg = attr[i] - 100 + 8;
995 else
996 fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]), csidump();
997
998 break;
999 }
1000 }
1001 }
1002
1003 void
1004 tsetscroll(int t, int b) {
1005 int temp;
1006
1007 LIMIT(t, 0, term.row-1);
1008 LIMIT(b, 0, term.row-1);
1009 if(t > b) {
1010 temp = t;
1011 t = b;
1012 b = temp;
1013 }
1014 term.top = t;
1015 term.bot = b;
1016 }
1017
1018 void
1019 csihandle(void) {
1020 switch(escseq.mode) {
1021 default:
1022 unknown:
1023 fprintf(stderr, "erresc: unknown csi ");
1024 csidump();
1025 /* die(""); */
1026 break;
1027 case '@': /* ICH -- Insert <n> blank char */
1028 DEFAULT(escseq.arg[0], 1);
1029 tinsertblank(escseq.arg[0]);
1030 break;
1031 case 'A': /* CUU -- Cursor <n> Up */
1032 case 'e':
1033 DEFAULT(escseq.arg[0], 1);
1034 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
1035 break;
1036 case 'B': /* CUD -- Cursor <n> Down */
1037 DEFAULT(escseq.arg[0], 1);
1038 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
1039 break;
1040 case 'C': /* CUF -- Cursor <n> Forward */
1041 case 'a':
1042 DEFAULT(escseq.arg[0], 1);
1043 tmoveto(term.c.x+escseq.arg[0], term.c.y);
1044 break;
1045 case 'D': /* CUB -- Cursor <n> Backward */
1046 DEFAULT(escseq.arg[0], 1);
1047 tmoveto(term.c.x-escseq.arg[0], term.c.y);
1048 break;
1049 case 'E': /* CNL -- Cursor <n> Down and first col */
1050 DEFAULT(escseq.arg[0], 1);
1051 tmoveto(0, term.c.y+escseq.arg[0]);
1052 break;
1053 case 'F': /* CPL -- Cursor <n> Up and first col */
1054 DEFAULT(escseq.arg[0], 1);
1055 tmoveto(0, term.c.y-escseq.arg[0]);
1056 break;
1057 case 'G': /* CHA -- Move to <col> */
1058 case '`': /* XXX: HPA -- same? */
1059 DEFAULT(escseq.arg[0], 1);
1060 tmoveto(escseq.arg[0]-1, term.c.y);
1061 break;
1062 case 'H': /* CUP -- Move to <row> <col> */
1063 case 'f': /* XXX: HVP -- same? */
1064 DEFAULT(escseq.arg[0], 1);
1065 DEFAULT(escseq.arg[1], 1);
1066 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
1067 break;
1068 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
1069 case 'J': /* ED -- Clear screen */
1070 switch(escseq.arg[0]) {
1071 case 0: /* below */
1072 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1073 if(term.c.y < term.row-1)
1074 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1075 break;
1076 case 1: /* above */
1077 if(term.c.y > 1)
1078 tclearregion(0, 0, term.col-1, term.c.y-1);
1079 tclearregion(0, term.c.y, term.c.x, term.c.y);
1080 break;
1081 case 2: /* all */
1082 tclearregion(0, 0, term.col-1, term.row-1);
1083 break;
1084 default:
1085 goto unknown;
1086 }
1087 break;
1088 case 'K': /* EL -- Clear line */
1089 switch(escseq.arg[0]) {
1090 case 0: /* right */
1091 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1092 break;
1093 case 1: /* left */
1094 tclearregion(0, term.c.y, term.c.x, term.c.y);
1095 break;
1096 case 2: /* all */
1097 tclearregion(0, term.c.y, term.col-1, term.c.y);
1098 break;
1099 }
1100 break;
1101 case 'S': /* SU -- Scroll <n> line up */
1102 DEFAULT(escseq.arg[0], 1);
1103 tscrollup(term.top, escseq.arg[0]);
1104 break;
1105 case 'T': /* SD -- Scroll <n> line down */
1106 DEFAULT(escseq.arg[0], 1);
1107 tscrolldown(term.top, escseq.arg[0]);
1108 break;
1109 case 'L': /* IL -- Insert <n> blank lines */
1110 DEFAULT(escseq.arg[0], 1);
1111 tinsertblankline(escseq.arg[0]);
1112 break;
1113 case 'l': /* RM -- Reset Mode */
1114 if(escseq.priv) {
1115 switch(escseq.arg[0]) {
1116 case 1:
1117 term.mode &= ~MODE_APPKEYPAD;
1118 break;
1119 case 5: /* DECSCNM -- Remove reverse video */
1120 if(IS_SET(MODE_REVERSE)) {
1121 term.mode &= ~MODE_REVERSE;
1122 draw();
1123 }
1124 break;
1125 case 7:
1126 term.mode &= ~MODE_WRAP;
1127 break;
1128 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
1129 break;
1130 case 20:
1131 term.mode &= ~MODE_CRLF;
1132 break;
1133 case 25:
1134 term.c.state |= CURSOR_HIDE;
1135 break;
1136 case 1000: /* disable X11 xterm mouse reporting */
1137 term.mode &= ~MODE_MOUSEBTN;
1138 break;
1139 case 1002:
1140 term.mode &= ~MODE_MOUSEMOTION;
1141 break;
1142 case 1049: /* = 1047 and 1048 */
1143 case 47:
1144 case 1047:
1145 if(IS_SET(MODE_ALTSCREEN)) {
1146 tclearregion(0, 0, term.col-1, term.row-1);
1147 tswapscreen();
1148 }
1149 if(escseq.arg[0] != 1049)
1150 break;
1151 case 1048:
1152 tcursor(CURSOR_LOAD);
1153 break;
1154 default:
1155 goto unknown;
1156 }
1157 } else {
1158 switch(escseq.arg[0]) {
1159 case 4:
1160 term.mode &= ~MODE_INSERT;
1161 break;
1162 default:
1163 goto unknown;
1164 }
1165 }
1166 break;
1167 case 'M': /* DL -- Delete <n> lines */
1168 DEFAULT(escseq.arg[0], 1);
1169 tdeleteline(escseq.arg[0]);
1170 break;
1171 case 'X': /* ECH -- Erase <n> char */
1172 DEFAULT(escseq.arg[0], 1);
1173 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
1174 break;
1175 case 'P': /* DCH -- Delete <n> char */
1176 DEFAULT(escseq.arg[0], 1);
1177 tdeletechar(escseq.arg[0]);
1178 break;
1179 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
1180 case 'd': /* VPA -- Move to <row> */
1181 DEFAULT(escseq.arg[0], 1);
1182 tmoveto(term.c.x, escseq.arg[0]-1);
1183 break;
1184 case 'h': /* SM -- Set terminal mode */
1185 if(escseq.priv) {
1186 switch(escseq.arg[0]) {
1187 case 1:
1188 term.mode |= MODE_APPKEYPAD;
1189 break;
1190 case 5: /* DECSCNM -- Reverve video */
1191 if(!IS_SET(MODE_REVERSE)) {
1192 term.mode |= MODE_REVERSE;
1193 draw();
1194 }
1195 break;
1196 case 7:
1197 term.mode |= MODE_WRAP;
1198 break;
1199 case 20:
1200 term.mode |= MODE_CRLF;
1201 break;
1202 case 12: /* att610 -- Start blinking cursor (IGNORED) */
1203 /* fallthrough for xterm cvvis = CSI [ ? 12 ; 25 h */
1204 if(escseq.narg > 1 && escseq.arg[1] != 25)
1205 break;
1206 case 25:
1207 term.c.state &= ~CURSOR_HIDE;
1208 break;
1209 case 1000: /* 1000,1002: enable xterm mouse report */
1210 term.mode |= MODE_MOUSEBTN;
1211 break;
1212 case 1002:
1213 term.mode |= MODE_MOUSEMOTION;
1214 break;
1215 case 1049: /* = 1047 and 1048 */
1216 case 47:
1217 case 1047:
1218 if(IS_SET(MODE_ALTSCREEN))
1219 tclearregion(0, 0, term.col-1, term.row-1);
1220 else
1221 tswapscreen();
1222 if(escseq.arg[0] != 1049)
1223 break;
1224 case 1048:
1225 tcursor(CURSOR_SAVE);
1226 break;
1227 default: goto unknown;
1228 }
1229 } else {
1230 switch(escseq.arg[0]) {
1231 case 4:
1232 term.mode |= MODE_INSERT;
1233 break;
1234 default: goto unknown;
1235 }
1236 };
1237 break;
1238 case 'm': /* SGR -- Terminal attribute (color) */
1239 tsetattr(escseq.arg, escseq.narg);
1240 break;
1241 case 'r': /* DECSTBM -- Set Scrolling Region */
1242 if(escseq.priv)
1243 goto unknown;
1244 else {
1245 DEFAULT(escseq.arg[0], 1);
1246 DEFAULT(escseq.arg[1], term.row);
1247 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
1248 tmoveto(0, 0);
1249 }
1250 break;
1251 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1252 tcursor(CURSOR_SAVE);
1253 break;
1254 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1255 tcursor(CURSOR_LOAD);
1256 break;
1257 }
1258 }
1259
1260 void
1261 csidump(void) {
1262 int i;
1263 printf("ESC [ %s", escseq.priv ? "? " : "");
1264 if(escseq.narg)
1265 for(i = 0; i < escseq.narg; i++)
1266 printf("%d ", escseq.arg[i]);
1267 if(escseq.mode)
1268 putchar(escseq.mode);
1269 putchar('\n');
1270 }
1271
1272 void
1273 csireset(void) {
1274 memset(&escseq, 0, sizeof(escseq));
1275 }
1276
1277 void
1278 tputtab(void) {
1279 int space = TAB - term.c.x % TAB;
1280 tmoveto(term.c.x + space, term.c.y);
1281 }
1282
1283 void
1284 tputc(char *c) {
1285 char ascii = *c;
1286 if(term.esc & ESC_START) {
1287 if(term.esc & ESC_CSI) {
1288 escseq.buf[escseq.len++] = ascii;
1289 if(BETWEEN(ascii, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
1290 term.esc = 0;
1291 csiparse(), csihandle();
1292 }
1293 /* TODO: handle other OSC */
1294 } else if(term.esc & ESC_OSC) {
1295 if(ascii == ';') {
1296 term.titlelen = 0;
1297 term.esc = ESC_START | ESC_TITLE;
1298 }
1299 } else if(term.esc & ESC_TITLE) {
1300 if(ascii == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
1301 term.esc = 0;
1302 term.title[term.titlelen] = '\0';
1303 XStoreName(xw.dpy, xw.win, term.title);
1304 } else {
1305 term.title[term.titlelen++] = ascii;
1306 }
1307 } else if(term.esc & ESC_ALTCHARSET) {
1308 switch(ascii) {
1309 case '0': /* Line drawing crap */
1310 term.c.attr.mode |= ATTR_GFX;
1311 break;
1312 case 'B': /* Back to regular text */
1313 term.c.attr.mode &= ~ATTR_GFX;
1314 break;
1315 default:
1316 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1317 }
1318 term.esc = 0;
1319 } else {
1320 switch(ascii) {
1321 case '[':
1322 term.esc |= ESC_CSI;
1323 break;
1324 case ']':
1325 term.esc |= ESC_OSC;
1326 break;
1327 case '(':
1328 term.esc |= ESC_ALTCHARSET;
1329 break;
1330 case 'D': /* IND -- Linefeed */
1331 if(term.c.y == term.bot)
1332 tscrollup(term.top, 1);
1333 else
1334 tmoveto(term.c.x, term.c.y+1);
1335 term.esc = 0;
1336 break;
1337 case 'E': /* NEL -- Next line */
1338 tnewline(1); /* always go to first col */
1339 term.esc = 0;
1340 break;
1341 case 'M': /* RI -- Reverse index */
1342 if(term.c.y == term.top)
1343 tscrolldown(term.top, 1);
1344 else
1345 tmoveto(term.c.x, term.c.y-1);
1346 term.esc = 0;
1347 break;
1348 case 'c': /* RIS -- Reset to inital state */
1349 treset();
1350 term.esc = 0;
1351 break;
1352 case '=': /* DECPAM -- Application keypad */
1353 term.mode |= MODE_APPKEYPAD;
1354 term.esc = 0;
1355 break;
1356 case '>': /* DECPNM -- Normal keypad */
1357 term.mode &= ~MODE_APPKEYPAD;
1358 term.esc = 0;
1359 break;
1360 case '7': /* DECSC -- Save Cursor */
1361 tcursor(CURSOR_SAVE);
1362 term.esc = 0;
1363 break;
1364 case '8': /* DECRC -- Restore Cursor */
1365 tcursor(CURSOR_LOAD);
1366 term.esc = 0;
1367 break;
1368 default:
1369 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1370 (unsigned char) ascii, isprint(ascii)?ascii:'.');
1371 term.esc = 0;
1372 }
1373 }
1374 } else {
1375 switch(ascii) {
1376 case '\t':
1377 tputtab();
1378 break;
1379 case '\b':
1380 tmoveto(term.c.x-1, term.c.y);
1381 break;
1382 case '\r':
1383 tmoveto(0, term.c.y);
1384 break;
1385 case '\f':
1386 case '\v':
1387 case '\n':
1388 /* go to first col if the mode is set */
1389 tnewline(IS_SET(MODE_CRLF));
1390 break;
1391 case '\a':
1392 if(!(xw.state & WIN_FOCUSED))
1393 xseturgency(1);
1394 break;
1395 case '\033':
1396 csireset();
1397 term.esc = ESC_START;
1398 break;
1399 default:
1400 if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1401 tnewline(1); /* always go to first col */
1402 tsetchar(c);
1403 if(term.c.x+1 < term.col)
1404 tmoveto(term.c.x+1, term.c.y);
1405 else
1406 term.c.state |= CURSOR_WRAPNEXT;
1407 }
1408 }
1409 }
1410
1411 int
1412 tresize(int col, int row) {
1413 int i, x;
1414 int minrow = MIN(row, term.row);
1415 int mincol = MIN(col, term.col);
1416 int slide = term.c.y - row + 1;
1417
1418 if(col < 1 || row < 1)
1419 return 0;
1420
1421 /* free unneeded rows */
1422 i = 0;
1423 if(slide > 0) {
1424 /* slide screen to keep cursor where we expect it -
1425 * tscrollup would work here, but we can optimize to
1426 * memmove because we're freeing the earlier lines */
1427 for(/* i = 0 */; i < slide; i++) {
1428 free(term.line[i]);
1429 free(term.alt[i]);
1430 }
1431 memmove(term.line, term.line + slide, row * sizeof(Line));
1432 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1433 }
1434 for(i += row; i < term.row; i++) {
1435 free(term.line[i]);
1436 free(term.alt[i]);
1437 }
1438
1439 /* resize to new height */
1440 term.line = realloc(term.line, row * sizeof(Line));
1441 term.alt = realloc(term.alt, row * sizeof(Line));
1442
1443 /* resize each row to new width, zero-pad if needed */
1444 for(i = 0; i < minrow; i++) {
1445 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1446 term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
1447 for(x = mincol; x < col; x++) {
1448 term.line[i][x].state = 0;
1449 term.alt[i][x].state = 0;
1450 }
1451 }
1452
1453 /* allocate any new rows */
1454 for(/* i == minrow */; i < row; i++) {
1455 term.line[i] = calloc(col, sizeof(Glyph));
1456 term.alt [i] = calloc(col, sizeof(Glyph));
1457 }
1458
1459 /* update terminal size */
1460 term.col = col, term.row = row;
1461 /* make use of the LIMIT in tmoveto */
1462 tmoveto(term.c.x, term.c.y);
1463 /* reset scrolling region */
1464 tsetscroll(0, row-1);
1465 return (slide > 0);
1466 }
1467
1468 void
1469 xresize(int col, int row) {
1470 Pixmap newbuf;
1471 int oldw, oldh;
1472
1473 oldw = xw.bufw;
1474 oldh = xw.bufh;
1475 xw.bufw = MAX(1, col * xw.cw);
1476 xw.bufh = MAX(1, row * xw.ch);
1477 newbuf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1478 XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
1479 XFreePixmap(xw.dpy, xw.buf);
1480 XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
1481 if(xw.bufw > oldw)
1482 XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
1483 xw.bufw-oldw, MIN(xw.bufh, oldh));
1484 else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
1485 XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
1486 xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
1487 False);
1488 if(xw.bufh > oldh)
1489 XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
1490 xw.bufw, xw.bufh-oldh);
1491 else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
1492 XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
1493 xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
1494 False);
1495 xw.buf = newbuf;
1496 }
1497
1498 void
1499 xloadcols(void) {
1500 int i, r, g, b;
1501 XColor color;
1502 unsigned long white = WhitePixel(xw.dpy, xw.scr);
1503
1504 for(i = 0; i < 16; i++) {
1505 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1506 dc.col[i] = white;
1507 fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1508 } else
1509 dc.col[i] = color.pixel;
1510 }
1511
1512 /* same colors as xterm */
1513 for(r = 0; r < 6; r++)
1514 for(g = 0; g < 6; g++)
1515 for(b = 0; b < 6; b++) {
1516 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1517 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1518 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1519 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1520 dc.col[i] = white;
1521 fprintf(stderr, "Could not allocate color %d\n", i);
1522 } else
1523 dc.col[i] = color.pixel;
1524 i++;
1525 }
1526
1527 for(r = 0; r < 24; r++, i++) {
1528 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
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 }
1535 }
1536
1537 void
1538 xclear(int x1, int y1, int x2, int y2) {
1539 XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1540 XFillRectangle(xw.dpy, xw.buf, dc.gc,
1541 x1 * xw.cw, y1 * xw.ch,
1542 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1543 }
1544
1545 void
1546 xhints(void) {
1547 XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1548 XWMHints wm = {.flags = InputHint, .input = 1};
1549 XSizeHints size = {
1550 .flags = PSize | PResizeInc | PBaseSize,
1551 .height = xw.h,
1552 .width = xw.w,
1553 .height_inc = xw.ch,
1554 .width_inc = xw.cw,
1555 .base_height = 2*BORDER,
1556 .base_width = 2*BORDER,
1557 };
1558 XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1559 }
1560
1561 XFontSet
1562 xinitfont(char *fontstr) {
1563 XFontSet set;
1564 char *def, **missing;
1565 int n;
1566
1567 missing = NULL;
1568 set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1569 if(missing) {
1570 while(n--)
1571 fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1572 XFreeStringList(missing);
1573 }
1574 return set;
1575 }
1576
1577 void
1578 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1579 XFontStruct **xfonts;
1580 char **font_names;
1581 int i, n;
1582
1583 *ascent = *descent = *lbearing = *rbearing = 0;
1584 n = XFontsOfFontSet(set, &xfonts, &font_names);
1585 for(i = 0; i < n; i++) {
1586 *ascent = MAX(*ascent, (*xfonts)->ascent);
1587 *descent = MAX(*descent, (*xfonts)->descent);
1588 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1589 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1590 xfonts++;
1591 }
1592 }
1593
1594 void
1595 initfonts(char *fontstr, char *bfontstr) {
1596 if((dc.font.set = xinitfont(fontstr)) == NULL ||
1597 (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1598 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1599 xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1600 &dc.font.lbearing, &dc.font.rbearing);
1601 xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1602 &dc.bfont.lbearing, &dc.bfont.rbearing);
1603 }
1604
1605 void
1606 xinit(void) {
1607 XSetWindowAttributes attrs;
1608 Cursor cursor;
1609
1610 if(!(xw.dpy = XOpenDisplay(NULL)))
1611 die("Can't open display\n");
1612 xw.scr = XDefaultScreen(xw.dpy);
1613
1614 /* font */
1615 initfonts(FONT, BOLDFONT);
1616
1617 /* XXX: Assuming same size for bold font */
1618 xw.cw = dc.font.rbearing - dc.font.lbearing;
1619 xw.ch = dc.font.ascent + dc.font.descent;
1620
1621 /* colors */
1622 xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1623 xloadcols();
1624
1625 /* window - default size */
1626 xw.bufh = 24 * xw.ch;
1627 xw.bufw = 80 * xw.cw;
1628 xw.h = xw.bufh + 2*BORDER;
1629 xw.w = xw.bufw + 2*BORDER;
1630
1631 attrs.background_pixel = dc.col[DefaultBG];
1632 attrs.border_pixel = dc.col[DefaultBG];
1633 attrs.bit_gravity = NorthWestGravity;
1634 attrs.event_mask = FocusChangeMask | KeyPressMask
1635 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1636 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
1637 attrs.colormap = xw.cmap;
1638
1639 xw.win = XCreateWindow(xw.dpy, XRootWindow(xw.dpy, xw.scr), 0, 0,
1640 xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1641 XDefaultVisual(xw.dpy, xw.scr),
1642 CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1643 | CWColormap,
1644 &attrs);
1645 xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
1646
1647
1648 /* input methods */
1649 xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1650 xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1651 | XIMStatusNothing, XNClientWindow, xw.win,
1652 XNFocusWindow, xw.win, NULL);
1653 /* gc */
1654 dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1655
1656 /* white cursor, black outline */
1657 cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1658 XDefineCursor(xw.dpy, xw.win, cursor);
1659 XRecolorCursor(xw.dpy, cursor,
1660 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1661 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1662
1663 XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1664 XMapWindow(xw.dpy, xw.win);
1665 xhints();
1666 XSync(xw.dpy, 0);
1667 }
1668
1669 void
1670 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1671 unsigned long xfg = dc.col[base.fg], xbg = dc.col[base.bg], temp;
1672 int winx = x*xw.cw, winy = y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1673 int i;
1674
1675 /* only switch default fg/bg if term is in RV mode */
1676 if(IS_SET(MODE_REVERSE)) {
1677 if(base.fg == DefaultFG)
1678 xfg = dc.col[DefaultBG];
1679 if(base.bg == DefaultBG)
1680 xbg = dc.col[DefaultFG];
1681 }
1682
1683 if(base.mode & ATTR_REVERSE)
1684 temp = xfg, xfg = xbg, xbg = temp;
1685
1686 XSetBackground(xw.dpy, dc.gc, xbg);
1687 XSetForeground(xw.dpy, dc.gc, xfg);
1688
1689 if(base.mode & ATTR_GFX) {
1690 for(i = 0; i < bytelen; i++) {
1691 char c = gfx[(unsigned int)s[i] % 256];
1692 if(c)
1693 s[i] = c;
1694 else if(s[i] > 0x5f)
1695 s[i] -= 0x5f;
1696 }
1697 }
1698
1699 XmbDrawImageString(xw.dpy, xw.buf, base.mode & ATTR_BOLD ? dc.bfont.set : dc.font.set,
1700 dc.gc, winx, winy, s, bytelen);
1701
1702 if(base.mode & ATTR_UNDERLINE)
1703 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1704 }
1705
1706 void
1707 xdrawcursor(void) {
1708 static int oldx = 0;
1709 static int oldy = 0;
1710 int sl;
1711 Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1712
1713 LIMIT(oldx, 0, term.col-1);
1714 LIMIT(oldy, 0, term.row-1);
1715
1716 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1717 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1718
1719 /* remove the old cursor */
1720 if(term.line[oldy][oldx].state & GLYPH_SET) {
1721 sl = utf8size(term.line[oldy][oldx].c);
1722 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
1723 } else
1724 xclear(oldx, oldy, oldx, oldy);
1725
1726 /* draw the new one */
1727 if(!(term.c.state & CURSOR_HIDE) && (xw.state & WIN_FOCUSED)) {
1728 sl = utf8size(g.c);
1729 if(IS_SET(MODE_REVERSE))
1730 g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
1731 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
1732 oldx = term.c.x, oldy = term.c.y;
1733 }
1734 }
1735
1736 void
1737 draw() {
1738 drawregion(0, 0, term.col, term.row);
1739 }
1740
1741 void
1742 drawregion(int x1, int y1, int x2, int y2) {
1743 int ic, ib, x, y, ox, sl;
1744 Glyph base, new;
1745 char buf[DRAW_BUF_SIZ];
1746
1747 if(!(xw.state & WIN_VISIBLE))
1748 return;
1749
1750 xclear(x1, y1, x2-1, y2-1);
1751 for(y = y1; y < y2; y++) {
1752 base = term.line[y][0];
1753 ic = ib = ox = 0;
1754 for(x = x1; x < x2; x++) {
1755 new = term.line[y][x];
1756 if(sel.bx != -1 && *(new.c) && selected(x, y))
1757 new.mode ^= ATTR_REVERSE;
1758 if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
1759 ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
1760 xdraws(buf, base, ox, y, ic, ib);
1761 ic = ib = 0;
1762 }
1763 if(new.state & GLYPH_SET) {
1764 if(ib == 0) {
1765 ox = x;
1766 base = new;
1767 }
1768 sl = utf8size(new.c);
1769 memcpy(buf+ib, new.c, sl);
1770 ib += sl;
1771 ++ic;
1772 }
1773 }
1774 if(ib > 0)
1775 xdraws(buf, base, ox, y, ic, ib);
1776 }
1777 xdrawcursor();
1778 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1779 }
1780
1781 void
1782 expose(XEvent *ev) {
1783 XExposeEvent *e = &ev->xexpose;
1784 if(xw.state & WIN_REDRAW) {
1785 if(!e->count) {
1786 xw.state &= ~WIN_REDRAW;
1787 draw();
1788 }
1789 } else
1790 XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
1791 e->width, e->height, e->x, e->y);
1792 }
1793
1794 void
1795 visibility(XEvent *ev) {
1796 XVisibilityEvent *e = &ev->xvisibility;
1797 if(e->state == VisibilityFullyObscured)
1798 xw.state &= ~WIN_VISIBLE;
1799 else if(!(xw.state & WIN_VISIBLE))
1800 /* need a full redraw for next Expose, not just a buf copy */
1801 xw.state |= WIN_VISIBLE | WIN_REDRAW;
1802 }
1803
1804 void
1805 unmap(XEvent *ev) {
1806 xw.state &= ~WIN_VISIBLE;
1807 }
1808
1809 void
1810 xseturgency(int add) {
1811 XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1812 h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
1813 XSetWMHints(xw.dpy, xw.win, h);
1814 XFree(h);
1815 }
1816
1817 void
1818 focus(XEvent *ev) {
1819 if(ev->type == FocusIn) {
1820 xw.state |= WIN_FOCUSED;
1821 xseturgency(0);
1822 } else
1823 xw.state &= ~WIN_FOCUSED;
1824 draw();
1825 }
1826
1827 char*
1828 kmap(KeySym k, unsigned int state) {
1829 int i;
1830 for(i = 0; i < LEN(key); i++)
1831 if(key[i].k == k && (key[i].mask == 0 || key[i].mask & state))
1832 return (char*)key[i].s;
1833 return NULL;
1834 }
1835
1836 void
1837 kpress(XEvent *ev) {
1838 XKeyEvent *e = &ev->xkey;
1839 KeySym ksym;
1840 char buf[32];
1841 char *customkey;
1842 int len;
1843 int meta;
1844 int shift;
1845 Status status;
1846
1847 meta = e->state & Mod1Mask;
1848 shift = e->state & ShiftMask;
1849 len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
1850
1851 /* 1. custom keys from config.h */
1852 if((customkey = kmap(ksym, e->state)))
1853 ttywrite(customkey, strlen(customkey));
1854 /* 2. hardcoded (overrides X lookup) */
1855 else
1856 switch(ksym) {
1857 case XK_Up:
1858 case XK_Down:
1859 case XK_Left:
1860 case XK_Right:
1861 /* XXX: shift up/down doesn't work */
1862 sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
1863 ttywrite(buf, 3);
1864 break;
1865 case XK_Insert:
1866 if(shift)
1867 selpaste();
1868 break;
1869 case XK_Return:
1870 if(IS_SET(MODE_CRLF))
1871 ttywrite("\r\n", 2);
1872 else
1873 ttywrite("\r", 1);
1874 break;
1875 /* 3. X lookup */
1876 default:
1877 if(len > 0) {
1878 if(meta && len == 1)
1879 ttywrite("\033", 1);
1880 ttywrite(buf, len);
1881 }
1882 break;
1883 }
1884 }
1885
1886 void
1887 resize(XEvent *e) {
1888 int col, row;
1889
1890 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1891 return;
1892
1893 xw.w = e->xconfigure.width;
1894 xw.h = e->xconfigure.height;
1895 col = (xw.w - 2*BORDER) / xw.cw;
1896 row = (xw.h - 2*BORDER) / xw.ch;
1897 if(col == term.col && row == term.row)
1898 return;
1899 if(tresize(col, row))
1900 draw();
1901 ttyresize(col, row);
1902 xresize(col, row);
1903 }
1904
1905 void
1906 run(void) {
1907 XEvent ev;
1908 fd_set rfd;
1909 int xfd = XConnectionNumber(xw.dpy);
1910
1911 for(;;) {
1912 FD_ZERO(&rfd);
1913 FD_SET(cmdfd, &rfd);
1914 FD_SET(xfd, &rfd);
1915 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
1916 if(errno == EINTR)
1917 continue;
1918 die("select failed: %s\n", SERRNO);
1919 }
1920 if(FD_ISSET(cmdfd, &rfd)) {
1921 ttyread();
1922 draw();
1923 }
1924 while(XPending(xw.dpy)) {
1925 XNextEvent(xw.dpy, &ev);
1926 if(XFilterEvent(&ev, xw.win))
1927 continue;
1928 if(handler[ev.type])
1929 (handler[ev.type])(&ev);
1930 }
1931 }
1932 }
1933
1934 int
1935 main(int argc, char *argv[]) {
1936 int i;
1937
1938 for(i = 1; i < argc; i++) {
1939 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
1940 case 't':
1941 if(++i < argc) opt_title = argv[i];
1942 break;
1943 case 'c':
1944 if(++i < argc) opt_class = argv[i];
1945 break;
1946 case 'e':
1947 /* eat every remaining arguments */
1948 if(++i < argc) opt_cmd = &argv[i];
1949 goto run;
1950 case 'v':
1951 default:
1952 die(USAGE);
1953 }
1954 }
1955
1956 run:
1957 setlocale(LC_CTYPE, "");
1958 tnew(80, 24);
1959 ttynew();
1960 xinit();
1961 selinit();
1962 run();
1963 return 0;
1964 }