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code-golfing: cleanup osc color related code
[st.git] / st.c
blob6ba467d7cc903d90f1aa1b5aa01da592ad1b30e6
1 /* See LICENSE for license details. */
2 #include <ctype.h>
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <limits.h>
6 #include <pwd.h>
7 #include <stdarg.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <signal.h>
12 #include <sys/ioctl.h>
13 #include <sys/select.h>
14 #include <sys/types.h>
15 #include <sys/wait.h>
16 #include <termios.h>
17 #include <unistd.h>
18 #include <wchar.h>
19
20 #include "st.h"
21 #include "win.h"
22
23 #if defined(__linux)
24 #include <pty.h>
25 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
26 #include <util.h>
27 #elif defined(__FreeBSD__) || defined(__DragonFly__)
28 #include <libutil.h>
29 #endif
30
31 /* Arbitrary sizes */
32 #define UTF_INVALID 0xFFFD
33 #define UTF_SIZ 4
34 #define ESC_BUF_SIZ (128*UTF_SIZ)
35 #define ESC_ARG_SIZ 16
36 #define STR_BUF_SIZ ESC_BUF_SIZ
37 #define STR_ARG_SIZ ESC_ARG_SIZ
38
39 /* macros */
40 #define IS_SET(flag) ((term.mode & (flag)) != 0)
41 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == 0x7f)
42 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
43 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
44 #define ISDELIM(u) (u && wcschr(worddelimiters, u))
45
46 enum term_mode {
47 MODE_WRAP = 1 << 0,
48 MODE_INSERT = 1 << 1,
49 MODE_ALTSCREEN = 1 << 2,
50 MODE_CRLF = 1 << 3,
51 MODE_ECHO = 1 << 4,
52 MODE_PRINT = 1 << 5,
53 MODE_UTF8 = 1 << 6,
54 };
55
56 enum cursor_movement {
57 CURSOR_SAVE,
58 CURSOR_LOAD
59 };
60
61 enum cursor_state {
62 CURSOR_DEFAULT = 0,
63 CURSOR_WRAPNEXT = 1,
64 CURSOR_ORIGIN = 2
65 };
66
67 enum charset {
68 CS_GRAPHIC0,
69 CS_GRAPHIC1,
70 CS_UK,
71 CS_USA,
72 CS_MULTI,
73 CS_GER,
74 CS_FIN
75 };
76
77 enum escape_state {
78 ESC_START = 1,
79 ESC_CSI = 2,
80 ESC_STR = 4, /* DCS, OSC, PM, APC */
81 ESC_ALTCHARSET = 8,
82 ESC_STR_END = 16, /* a final string was encountered */
83 ESC_TEST = 32, /* Enter in test mode */
84 ESC_UTF8 = 64,
85 };
86
87 typedef struct {
88 Glyph attr; /* current char attributes */
89 int x;
90 int y;
91 char state;
92 } TCursor;
93
94 typedef struct {
95 int mode;
96 int type;
97 int snap;
98 /*
99 * Selection variables:
100 * nb – normalized coordinates of the beginning of the selection
101 * ne – normalized coordinates of the end of the selection
102 * ob – original coordinates of the beginning of the selection
103 * oe – original coordinates of the end of the selection
104 */
105 struct {
106 int x, y;
107 } nb, ne, ob, oe;
108
109 int alt;
110 } Selection;
111
112 /* Internal representation of the screen */
113 typedef struct {
114 int row; /* nb row */
115 int col; /* nb col */
116 Line *line; /* screen */
117 Line *alt; /* alternate screen */
118 int *dirty; /* dirtyness of lines */
119 TCursor c; /* cursor */
120 int ocx; /* old cursor col */
121 int ocy; /* old cursor row */
122 int top; /* top scroll limit */
123 int bot; /* bottom scroll limit */
124 int mode; /* terminal mode flags */
125 int esc; /* escape state flags */
126 char trantbl[4]; /* charset table translation */
127 int charset; /* current charset */
128 int icharset; /* selected charset for sequence */
129 int *tabs;
130 Rune lastc; /* last printed char outside of sequence, 0 if control */
131 } Term;
132
133 /* CSI Escape sequence structs */
134 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
135 typedef struct {
136 char buf[ESC_BUF_SIZ]; /* raw string */
137 size_t len; /* raw string length */
138 char priv;
139 int arg[ESC_ARG_SIZ];
140 int narg; /* nb of args */
141 char mode[2];
142 } CSIEscape;
143
144 /* STR Escape sequence structs */
145 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
146 typedef struct {
147 char type; /* ESC type ... */
148 char *buf; /* allocated raw string */
149 size_t siz; /* allocation size */
150 size_t len; /* raw string length */
151 char *args[STR_ARG_SIZ];
152 int narg; /* nb of args */
153 } STREscape;
154
155 static void execsh(char *, char **);
156 static void stty(char **);
157 static void sigchld(int);
158 static void ttywriteraw(const char *, size_t);
159
160 static void csidump(void);
161 static void csihandle(void);
162 static void csiparse(void);
163 static void csireset(void);
164 static void osc_color_response(int, int, int);
165 static int eschandle(uchar);
166 static void strdump(void);
167 static void strhandle(void);
168 static void strparse(void);
169 static void strreset(void);
170
171 static void tprinter(char *, size_t);
172 static void tdumpsel(void);
173 static void tdumpline(int);
174 static void tdump(void);
175 static void tclearregion(int, int, int, int);
176 static void tcursor(int);
177 static void tdeletechar(int);
178 static void tdeleteline(int);
179 static void tinsertblank(int);
180 static void tinsertblankline(int);
181 static int tlinelen(int);
182 static void tmoveto(int, int);
183 static void tmoveato(int, int);
184 static void tnewline(int);
185 static void tputtab(int);
186 static void tputc(Rune);
187 static void treset(void);
188 static void tscrollup(int, int);
189 static void tscrolldown(int, int);
190 static void tsetattr(const int *, int);
191 static void tsetchar(Rune, const Glyph *, int, int);
192 static void tsetdirt(int, int);
193 static void tsetscroll(int, int);
194 static void tswapscreen(void);
195 static void tsetmode(int, int, const int *, int);
196 static int twrite(const char *, int, int);
197 static void tfulldirt(void);
198 static void tcontrolcode(uchar );
199 static void tdectest(char );
200 static void tdefutf8(char);
201 static int32_t tdefcolor(const int *, int *, int);
202 static void tdeftran(char);
203 static void tstrsequence(uchar);
204
205 static void drawregion(int, int, int, int);
206
207 static void selnormalize(void);
208 static void selscroll(int, int);
209 static void selsnap(int *, int *, int);
210
211 static size_t utf8decode(const char *, Rune *, size_t);
212 static Rune utf8decodebyte(char, size_t *);
213 static char utf8encodebyte(Rune, size_t);
214 static size_t utf8validate(Rune *, size_t);
215
216 static char *base64dec(const char *);
217 static char base64dec_getc(const char **);
218
219 static ssize_t xwrite(int, const char *, size_t);
220
221 /* Globals */
222 static Term term;
223 static Selection sel;
224 static CSIEscape csiescseq;
225 static STREscape strescseq;
226 static int iofd = 1;
227 static int cmdfd;
228 static pid_t pid;
229
230 static const uchar utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
231 static const uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
232 static const Rune utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
233 static const Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
234
235 ssize_t
236 xwrite(int fd, const char *s, size_t len)
237 {
238 size_t aux = len;
239 ssize_t r;
240
241 while (len > 0) {
242 r = write(fd, s, len);
243 if (r < 0)
244 return r;
245 len -= r;
246 s += r;
247 }
248
249 return aux;
250 }
251
252 void *
253 xmalloc(size_t len)
254 {
255 void *p;
256
257 if (!(p = malloc(len)))
258 die("malloc: %s\n", strerror(errno));
259
260 return p;
261 }
262
263 void *
264 xrealloc(void *p, size_t len)
265 {
266 if ((p = realloc(p, len)) == NULL)
267 die("realloc: %s\n", strerror(errno));
268
269 return p;
270 }
271
272 char *
273 xstrdup(const char *s)
274 {
275 char *p;
276
277 if ((p = strdup(s)) == NULL)
278 die("strdup: %s\n", strerror(errno));
279
280 return p;
281 }
282
283 size_t
284 utf8decode(const char *c, Rune *u, size_t clen)
285 {
286 size_t i, j, len, type;
287 Rune udecoded;
288
289 *u = UTF_INVALID;
290 if (!clen)
291 return 0;
292 udecoded = utf8decodebyte(c[0], &len);
293 if (!BETWEEN(len, 1, UTF_SIZ))
294 return 1;
295 for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
296 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
297 if (type != 0)
298 return j;
299 }
300 if (j < len)
301 return 0;
302 *u = udecoded;
303 utf8validate(u, len);
304
305 return len;
306 }
307
308 Rune
309 utf8decodebyte(char c, size_t *i)
310 {
311 for (*i = 0; *i < LEN(utfmask); ++(*i))
312 if (((uchar)c & utfmask[*i]) == utfbyte[*i])
313 return (uchar)c & ~utfmask[*i];
314
315 return 0;
316 }
317
318 size_t
319 utf8encode(Rune u, char *c)
320 {
321 size_t len, i;
322
323 len = utf8validate(&u, 0);
324 if (len > UTF_SIZ)
325 return 0;
326
327 for (i = len - 1; i != 0; --i) {
328 c[i] = utf8encodebyte(u, 0);
329 u >>= 6;
330 }
331 c[0] = utf8encodebyte(u, len);
332
333 return len;
334 }
335
336 char
337 utf8encodebyte(Rune u, size_t i)
338 {
339 return utfbyte[i] | (u & ~utfmask[i]);
340 }
341
342 size_t
343 utf8validate(Rune *u, size_t i)
344 {
345 if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
346 *u = UTF_INVALID;
347 for (i = 1; *u > utfmax[i]; ++i)
348 ;
349
350 return i;
351 }
352
353 char
354 base64dec_getc(const char **src)
355 {
356 while (**src && !isprint((unsigned char)**src))
357 (*src)++;
358 return **src ? *((*src)++) : '='; /* emulate padding if string ends */
359 }
360
361 char *
362 base64dec(const char *src)
363 {
364 size_t in_len = strlen(src);
365 char *result, *dst;
366 static const char base64_digits[256] = {
367 [43] = 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
368 0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
369 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0,
370 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
371 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
372 };
373
374 if (in_len % 4)
375 in_len += 4 - (in_len % 4);
376 result = dst = xmalloc(in_len / 4 * 3 + 1);
377 while (*src) {
378 int a = base64_digits[(unsigned char) base64dec_getc(&src)];
379 int b = base64_digits[(unsigned char) base64dec_getc(&src)];
380 int c = base64_digits[(unsigned char) base64dec_getc(&src)];
381 int d = base64_digits[(unsigned char) base64dec_getc(&src)];
382
383 /* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */
384 if (a == -1 || b == -1)
385 break;
386
387 *dst++ = (a << 2) | ((b & 0x30) >> 4);
388 if (c == -1)
389 break;
390 *dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
391 if (d == -1)
392 break;
393 *dst++ = ((c & 0x03) << 6) | d;
394 }
395 *dst = '\0';
396 return result;
397 }
398
399 void
400 selinit(void)
401 {
402 sel.mode = SEL_IDLE;
403 sel.snap = 0;
404 sel.ob.x = -1;
405 }
406
407 int
408 tlinelen(int y)
409 {
410 int i = term.col;
411
412 if (term.line[y][i - 1].mode & ATTR_WRAP)
413 return i;
414
415 while (i > 0 && term.line[y][i - 1].u == ' ')
416 --i;
417
418 return i;
419 }
420
421 void
422 selstart(int col, int row, int snap)
423 {
424 selclear();
425 sel.mode = SEL_EMPTY;
426 sel.type = SEL_REGULAR;
427 sel.alt = IS_SET(MODE_ALTSCREEN);
428 sel.snap = snap;
429 sel.oe.x = sel.ob.x = col;
430 sel.oe.y = sel.ob.y = row;
431 selnormalize();
432
433 if (sel.snap != 0)
434 sel.mode = SEL_READY;
435 tsetdirt(sel.nb.y, sel.ne.y);
436 }
437
438 void
439 selextend(int col, int row, int type, int done)
440 {
441 int oldey, oldex, oldsby, oldsey, oldtype;
442
443 if (sel.mode == SEL_IDLE)
444 return;
445 if (done && sel.mode == SEL_EMPTY) {
446 selclear();
447 return;
448 }
449
450 oldey = sel.oe.y;
451 oldex = sel.oe.x;
452 oldsby = sel.nb.y;
453 oldsey = sel.ne.y;
454 oldtype = sel.type;
455
456 sel.oe.x = col;
457 sel.oe.y = row;
458 selnormalize();
459 sel.type = type;
460
461 if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY)
462 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
463
464 sel.mode = done ? SEL_IDLE : SEL_READY;
465 }
466
467 void
468 selnormalize(void)
469 {
470 int i;
471
472 if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
473 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
474 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
475 } else {
476 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
477 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
478 }
479 sel.nb.y = MIN(sel.ob.y, sel.oe.y);
480 sel.ne.y = MAX(sel.ob.y, sel.oe.y);
481
482 selsnap(&sel.nb.x, &sel.nb.y, -1);
483 selsnap(&sel.ne.x, &sel.ne.y, +1);
484
485 /* expand selection over line breaks */
486 if (sel.type == SEL_RECTANGULAR)
487 return;
488 i = tlinelen(sel.nb.y);
489 if (i < sel.nb.x)
490 sel.nb.x = i;
491 if (tlinelen(sel.ne.y) <= sel.ne.x)
492 sel.ne.x = term.col - 1;
493 }
494
495 int
496 selected(int x, int y)
497 {
498 if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
499 sel.alt != IS_SET(MODE_ALTSCREEN))
500 return 0;
501
502 if (sel.type == SEL_RECTANGULAR)
503 return BETWEEN(y, sel.nb.y, sel.ne.y)
504 && BETWEEN(x, sel.nb.x, sel.ne.x);
505
506 return BETWEEN(y, sel.nb.y, sel.ne.y)
507 && (y != sel.nb.y || x >= sel.nb.x)
508 && (y != sel.ne.y || x <= sel.ne.x);
509 }
510
511 void
512 selsnap(int *x, int *y, int direction)
513 {
514 int newx, newy, xt, yt;
515 int delim, prevdelim;
516 const Glyph *gp, *prevgp;
517
518 switch (sel.snap) {
519 case SNAP_WORD:
520 /*
521 * Snap around if the word wraps around at the end or
522 * beginning of a line.
523 */
524 prevgp = &term.line[*y][*x];
525 prevdelim = ISDELIM(prevgp->u);
526 for (;;) {
527 newx = *x + direction;
528 newy = *y;
529 if (!BETWEEN(newx, 0, term.col - 1)) {
530 newy += direction;
531 newx = (newx + term.col) % term.col;
532 if (!BETWEEN(newy, 0, term.row - 1))
533 break;
534
535 if (direction > 0)
536 yt = *y, xt = *x;
537 else
538 yt = newy, xt = newx;
539 if (!(term.line[yt][xt].mode & ATTR_WRAP))
540 break;
541 }
542
543 if (newx >= tlinelen(newy))
544 break;
545
546 gp = &term.line[newy][newx];
547 delim = ISDELIM(gp->u);
548 if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
549 || (delim && gp->u != prevgp->u)))
550 break;
551
552 *x = newx;
553 *y = newy;
554 prevgp = gp;
555 prevdelim = delim;
556 }
557 break;
558 case SNAP_LINE:
559 /*
560 * Snap around if the the previous line or the current one
561 * has set ATTR_WRAP at its end. Then the whole next or
562 * previous line will be selected.
563 */
564 *x = (direction < 0) ? 0 : term.col - 1;
565 if (direction < 0) {
566 for (; *y > 0; *y += direction) {
567 if (!(term.line[*y-1][term.col-1].mode
568 & ATTR_WRAP)) {
569 break;
570 }
571 }
572 } else if (direction > 0) {
573 for (; *y < term.row-1; *y += direction) {
574 if (!(term.line[*y][term.col-1].mode
575 & ATTR_WRAP)) {
576 break;
577 }
578 }
579 }
580 break;
581 }
582 }
583
584 char *
585 getsel(void)
586 {
587 char *str, *ptr;
588 int y, bufsize, lastx, linelen;
589 const Glyph *gp, *last;
590
591 if (sel.ob.x == -1)
592 return NULL;
593
594 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
595 ptr = str = xmalloc(bufsize);
596
597 /* append every set & selected glyph to the selection */
598 for (y = sel.nb.y; y <= sel.ne.y; y++) {
599 if ((linelen = tlinelen(y)) == 0) {
600 *ptr++ = '\n';
601 continue;
602 }
603
604 if (sel.type == SEL_RECTANGULAR) {
605 gp = &term.line[y][sel.nb.x];
606 lastx = sel.ne.x;
607 } else {
608 gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
609 lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
610 }
611 last = &term.line[y][MIN(lastx, linelen-1)];
612 while (last >= gp && last->u == ' ')
613 --last;
614
615 for ( ; gp <= last; ++gp) {
616 if (gp->mode & ATTR_WDUMMY)
617 continue;
618
619 ptr += utf8encode(gp->u, ptr);
620 }
621
622 /*
623 * Copy and pasting of line endings is inconsistent
624 * in the inconsistent terminal and GUI world.
625 * The best solution seems like to produce '\n' when
626 * something is copied from st and convert '\n' to
627 * '\r', when something to be pasted is received by
628 * st.
629 * FIXME: Fix the computer world.
630 */
631 if ((y < sel.ne.y || lastx >= linelen) &&
632 (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
633 *ptr++ = '\n';
634 }
635 *ptr = 0;
636 return str;
637 }
638
639 void
640 selclear(void)
641 {
642 if (sel.ob.x == -1)
643 return;
644 sel.mode = SEL_IDLE;
645 sel.ob.x = -1;
646 tsetdirt(sel.nb.y, sel.ne.y);
647 }
648
649 void
650 die(const char *errstr, ...)
651 {
652 va_list ap;
653
654 va_start(ap, errstr);
655 vfprintf(stderr, errstr, ap);
656 va_end(ap);
657 exit(1);
658 }
659
660 void
661 execsh(char *cmd, char **args)
662 {
663 char *sh, *prog, *arg;
664 const struct passwd *pw;
665
666 errno = 0;
667 if ((pw = getpwuid(getuid())) == NULL) {
668 if (errno)
669 die("getpwuid: %s\n", strerror(errno));
670 else
671 die("who are you?\n");
672 }
673
674 if ((sh = getenv("SHELL")) == NULL)
675 sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;
676
677 if (args) {
678 prog = args[0];
679 arg = NULL;
680 } else if (scroll) {
681 prog = scroll;
682 arg = utmp ? utmp : sh;
683 } else if (utmp) {
684 prog = utmp;
685 arg = NULL;
686 } else {
687 prog = sh;
688 arg = NULL;
689 }
690 DEFAULT(args, ((char *[]) {prog, arg, NULL}));
691
692 unsetenv("COLUMNS");
693 unsetenv("LINES");
694 unsetenv("TERMCAP");
695 setenv("LOGNAME", pw->pw_name, 1);
696 setenv("USER", pw->pw_name, 1);
697 setenv("SHELL", sh, 1);
698 setenv("HOME", pw->pw_dir, 1);
699 setenv("TERM", termname, 1);
700
701 signal(SIGCHLD, SIG_DFL);
702 signal(SIGHUP, SIG_DFL);
703 signal(SIGINT, SIG_DFL);
704 signal(SIGQUIT, SIG_DFL);
705 signal(SIGTERM, SIG_DFL);
706 signal(SIGALRM, SIG_DFL);
707
708 execvp(prog, args);
709 _exit(1);
710 }
711
712 void
713 sigchld(int a)
714 {
715 int stat;
716 pid_t p;
717
718 if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
719 die("waiting for pid %hd failed: %s\n", pid, strerror(errno));
720
721 if (pid != p)
722 return;
723
724 if (WIFEXITED(stat) && WEXITSTATUS(stat))
725 die("child exited with status %d\n", WEXITSTATUS(stat));
726 else if (WIFSIGNALED(stat))
727 die("child terminated due to signal %d\n", WTERMSIG(stat));
728 _exit(0);
729 }
730
731 void
732 stty(char **args)
733 {
734 char cmd[_POSIX_ARG_MAX], **p, *q, *s;
735 size_t n, siz;
736
737 if ((n = strlen(stty_args)) > sizeof(cmd)-1)
738 die("incorrect stty parameters\n");
739 memcpy(cmd, stty_args, n);
740 q = cmd + n;
741 siz = sizeof(cmd) - n;
742 for (p = args; p && (s = *p); ++p) {
743 if ((n = strlen(s)) > siz-1)
744 die("stty parameter length too long\n");
745 *q++ = ' ';
746 memcpy(q, s, n);
747 q += n;
748 siz -= n + 1;
749 }
750 *q = '\0';
751 if (system(cmd) != 0)
752 perror("Couldn't call stty");
753 }
754
755 int
756 ttynew(const char *line, char *cmd, const char *out, char **args)
757 {
758 int m, s;
759
760 if (out) {
761 term.mode |= MODE_PRINT;
762 iofd = (!strcmp(out, "-")) ?
763 1 : open(out, O_WRONLY | O_CREAT, 0666);
764 if (iofd < 0) {
765 fprintf(stderr, "Error opening %s:%s\n",
766 out, strerror(errno));
767 }
768 }
769
770 if (line) {
771 if ((cmdfd = open(line, O_RDWR)) < 0)
772 die("open line '%s' failed: %s\n",
773 line, strerror(errno));
774 dup2(cmdfd, 0);
775 stty(args);
776 return cmdfd;
777 }
778
779 /* seems to work fine on linux, openbsd and freebsd */
780 if (openpty(&m, &s, NULL, NULL, NULL) < 0)
781 die("openpty failed: %s\n", strerror(errno));
782
783 switch (pid = fork()) {
784 case -1:
785 die("fork failed: %s\n", strerror(errno));
786 break;
787 case 0:
788 close(iofd);
789 close(m);
790 setsid(); /* create a new process group */
791 dup2(s, 0);
792 dup2(s, 1);
793 dup2(s, 2);
794 if (ioctl(s, TIOCSCTTY, NULL) < 0)
795 die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
796 if (s > 2)
797 close(s);
798 #ifdef __OpenBSD__
799 if (pledge("stdio getpw proc exec", NULL) == -1)
800 die("pledge\n");
801 #endif
802 execsh(cmd, args);
803 break;
804 default:
805 #ifdef __OpenBSD__
806 if (pledge("stdio rpath tty proc", NULL) == -1)
807 die("pledge\n");
808 #endif
809 close(s);
810 cmdfd = m;
811 signal(SIGCHLD, sigchld);
812 break;
813 }
814 return cmdfd;
815 }
816
817 size_t
818 ttyread(void)
819 {
820 static char buf[BUFSIZ];
821 static int buflen = 0;
822 int ret, written;
823
824 /* append read bytes to unprocessed bytes */
825 ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);
826
827 switch (ret) {
828 case 0:
829 exit(0);
830 case -1:
831 die("couldn't read from shell: %s\n", strerror(errno));
832 default:
833 buflen += ret;
834 written = twrite(buf, buflen, 0);
835 buflen -= written;
836 /* keep any incomplete UTF-8 byte sequence for the next call */
837 if (buflen > 0)
838 memmove(buf, buf + written, buflen);
839 return ret;
840 }
841 }
842
843 void
844 ttywrite(const char *s, size_t n, int may_echo)
845 {
846 const char *next;
847
848 if (may_echo && IS_SET(MODE_ECHO))
849 twrite(s, n, 1);
850
851 if (!IS_SET(MODE_CRLF)) {
852 ttywriteraw(s, n);
853 return;
854 }
855
856 /* This is similar to how the kernel handles ONLCR for ttys */
857 while (n > 0) {
858 if (*s == '\r') {
859 next = s + 1;
860 ttywriteraw("\r\n", 2);
861 } else {
862 next = memchr(s, '\r', n);
863 DEFAULT(next, s + n);
864 ttywriteraw(s, next - s);
865 }
866 n -= next - s;
867 s = next;
868 }
869 }
870
871 void
872 ttywriteraw(const char *s, size_t n)
873 {
874 fd_set wfd, rfd;
875 ssize_t r;
876 size_t lim = 256;
877
878 /*
879 * Remember that we are using a pty, which might be a modem line.
880 * Writing too much will clog the line. That's why we are doing this
881 * dance.
882 * FIXME: Migrate the world to Plan 9.
883 */
884 while (n > 0) {
885 FD_ZERO(&wfd);
886 FD_ZERO(&rfd);
887 FD_SET(cmdfd, &wfd);
888 FD_SET(cmdfd, &rfd);
889
890 /* Check if we can write. */
891 if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) {
892 if (errno == EINTR)
893 continue;
894 die("select failed: %s\n", strerror(errno));
895 }
896 if (FD_ISSET(cmdfd, &wfd)) {
897 /*
898 * Only write the bytes written by ttywrite() or the
899 * default of 256. This seems to be a reasonable value
900 * for a serial line. Bigger values might clog the I/O.
901 */
902 if ((r = write(cmdfd, s, (n < lim)? n : lim)) < 0)
903 goto write_error;
904 if (r < n) {
905 /*
906 * We weren't able to write out everything.
907 * This means the buffer is getting full
908 * again. Empty it.
909 */
910 if (n < lim)
911 lim = ttyread();
912 n -= r;
913 s += r;
914 } else {
915 /* All bytes have been written. */
916 break;
917 }
918 }
919 if (FD_ISSET(cmdfd, &rfd))
920 lim = ttyread();
921 }
922 return;
923
924 write_error:
925 die("write error on tty: %s\n", strerror(errno));
926 }
927
928 void
929 ttyresize(int tw, int th)
930 {
931 struct winsize w;
932
933 w.ws_row = term.row;
934 w.ws_col = term.col;
935 w.ws_xpixel = tw;
936 w.ws_ypixel = th;
937 if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
938 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
939 }
940
941 void
942 ttyhangup()
943 {
944 /* Send SIGHUP to shell */
945 kill(pid, SIGHUP);
946 }
947
948 int
949 tattrset(int attr)
950 {
951 int i, j;
952
953 for (i = 0; i < term.row-1; i++) {
954 for (j = 0; j < term.col-1; j++) {
955 if (term.line[i][j].mode & attr)
956 return 1;
957 }
958 }
959
960 return 0;
961 }
962
963 void
964 tsetdirt(int top, int bot)
965 {
966 int i;
967
968 LIMIT(top, 0, term.row-1);
969 LIMIT(bot, 0, term.row-1);
970
971 for (i = top; i <= bot; i++)
972 term.dirty[i] = 1;
973 }
974
975 void
976 tsetdirtattr(int attr)
977 {
978 int i, j;
979
980 for (i = 0; i < term.row-1; i++) {
981 for (j = 0; j < term.col-1; j++) {
982 if (term.line[i][j].mode & attr) {
983 tsetdirt(i, i);
984 break;
985 }
986 }
987 }
988 }
989
990 void
991 tfulldirt(void)
992 {
993 tsetdirt(0, term.row-1);
994 }
995
996 void
997 tcursor(int mode)
998 {
999 static TCursor c[2];
1000 int alt = IS_SET(MODE_ALTSCREEN);
1001
1002 if (mode == CURSOR_SAVE) {
1003 c[alt] = term.c;
1004 } else if (mode == CURSOR_LOAD) {
1005 term.c = c[alt];
1006 tmoveto(c[alt].x, c[alt].y);
1007 }
1008 }
1009
1010 void
1011 treset(void)
1012 {
1013 uint i;
1014
1015 term.c = (TCursor){{
1016 .mode = ATTR_NULL,
1017 .fg = defaultfg,
1018 .bg = defaultbg
1019 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1020
1021 memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1022 for (i = tabspaces; i < term.col; i += tabspaces)
1023 term.tabs[i] = 1;
1024 term.top = 0;
1025 term.bot = term.row - 1;
1026 term.mode = MODE_WRAP|MODE_UTF8;
1027 memset(term.trantbl, CS_USA, sizeof(term.trantbl));
1028 term.charset = 0;
1029
1030 for (i = 0; i < 2; i++) {
1031 tmoveto(0, 0);
1032 tcursor(CURSOR_SAVE);
1033 tclearregion(0, 0, term.col-1, term.row-1);
1034 tswapscreen();
1035 }
1036 }
1037
1038 void
1039 tnew(int col, int row)
1040 {
1041 term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1042 tresize(col, row);
1043 treset();
1044 }
1045
1046 void
1047 tswapscreen(void)
1048 {
1049 Line *tmp = term.line;
1050
1051 term.line = term.alt;
1052 term.alt = tmp;
1053 term.mode ^= MODE_ALTSCREEN;
1054 tfulldirt();
1055 }
1056
1057 void
1058 tscrolldown(int orig, int n)
1059 {
1060 int i;
1061 Line temp;
1062
1063 LIMIT(n, 0, term.bot-orig+1);
1064
1065 tsetdirt(orig, term.bot-n);
1066 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1067
1068 for (i = term.bot; i >= orig+n; i--) {
1069 temp = term.line[i];
1070 term.line[i] = term.line[i-n];
1071 term.line[i-n] = temp;
1072 }
1073
1074 selscroll(orig, n);
1075 }
1076
1077 void
1078 tscrollup(int orig, int n)
1079 {
1080 int i;
1081 Line temp;
1082
1083 LIMIT(n, 0, term.bot-orig+1);
1084
1085 tclearregion(0, orig, term.col-1, orig+n-1);
1086 tsetdirt(orig+n, term.bot);
1087
1088 for (i = orig; i <= term.bot-n; i++) {
1089 temp = term.line[i];
1090 term.line[i] = term.line[i+n];
1091 term.line[i+n] = temp;
1092 }
1093
1094 selscroll(orig, -n);
1095 }
1096
1097 void
1098 selscroll(int orig, int n)
1099 {
1100 if (sel.ob.x == -1)
1101 return;
1102
1103 if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {
1104 selclear();
1105 } else if (BETWEEN(sel.nb.y, orig, term.bot)) {
1106 sel.ob.y += n;
1107 sel.oe.y += n;
1108 if (sel.ob.y < term.top || sel.ob.y > term.bot ||
1109 sel.oe.y < term.top || sel.oe.y > term.bot) {
1110 selclear();
1111 } else {
1112 selnormalize();
1113 }
1114 }
1115 }
1116
1117 void
1118 tnewline(int first_col)
1119 {
1120 int y = term.c.y;
1121
1122 if (y == term.bot) {
1123 tscrollup(term.top, 1);
1124 } else {
1125 y++;
1126 }
1127 tmoveto(first_col ? 0 : term.c.x, y);
1128 }
1129
1130 void
1131 csiparse(void)
1132 {
1133 char *p = csiescseq.buf, *np;
1134 long int v;
1135
1136 csiescseq.narg = 0;
1137 if (*p == '?') {
1138 csiescseq.priv = 1;
1139 p++;
1140 }
1141
1142 csiescseq.buf[csiescseq.len] = '\0';
1143 while (p < csiescseq.buf+csiescseq.len) {
1144 np = NULL;
1145 v = strtol(p, &np, 10);
1146 if (np == p)
1147 v = 0;
1148 if (v == LONG_MAX || v == LONG_MIN)
1149 v = -1;
1150 csiescseq.arg[csiescseq.narg++] = v;
1151 p = np;
1152 if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1153 break;
1154 p++;
1155 }
1156 csiescseq.mode[0] = *p++;
1157 csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1158 }
1159
1160 /* for absolute user moves, when decom is set */
1161 void
1162 tmoveato(int x, int y)
1163 {
1164 tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1165 }
1166
1167 void
1168 tmoveto(int x, int y)
1169 {
1170 int miny, maxy;
1171
1172 if (term.c.state & CURSOR_ORIGIN) {
1173 miny = term.top;
1174 maxy = term.bot;
1175 } else {
1176 miny = 0;
1177 maxy = term.row - 1;
1178 }
1179 term.c.state &= ~CURSOR_WRAPNEXT;
1180 term.c.x = LIMIT(x, 0, term.col-1);
1181 term.c.y = LIMIT(y, miny, maxy);
1182 }
1183
1184 void
1185 tsetchar(Rune u, const Glyph *attr, int x, int y)
1186 {
1187 static const char *vt100_0[62] = { /* 0x41 - 0x7e */
1188 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1189 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1190 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1191 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1192 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1193 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1194 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1195 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1196 };
1197
1198 /*
1199 * The table is proudly stolen from rxvt.
1200 */
1201 if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
1202 BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
1203 utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
1204
1205 if (term.line[y][x].mode & ATTR_WIDE) {
1206 if (x+1 < term.col) {
1207 term.line[y][x+1].u = ' ';
1208 term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1209 }
1210 } else if (term.line[y][x].mode & ATTR_WDUMMY) {
1211 term.line[y][x-1].u = ' ';
1212 term.line[y][x-1].mode &= ~ATTR_WIDE;
1213 }
1214
1215 term.dirty[y] = 1;
1216 term.line[y][x] = *attr;
1217 term.line[y][x].u = u;
1218 }
1219
1220 void
1221 tclearregion(int x1, int y1, int x2, int y2)
1222 {
1223 int x, y, temp;
1224 Glyph *gp;
1225
1226 if (x1 > x2)
1227 temp = x1, x1 = x2, x2 = temp;
1228 if (y1 > y2)
1229 temp = y1, y1 = y2, y2 = temp;
1230
1231 LIMIT(x1, 0, term.col-1);
1232 LIMIT(x2, 0, term.col-1);
1233 LIMIT(y1, 0, term.row-1);
1234 LIMIT(y2, 0, term.row-1);
1235
1236 for (y = y1; y <= y2; y++) {
1237 term.dirty[y] = 1;
1238 for (x = x1; x <= x2; x++) {
1239 gp = &term.line[y][x];
1240 if (selected(x, y))
1241 selclear();
1242 gp->fg = term.c.attr.fg;
1243 gp->bg = term.c.attr.bg;
1244 gp->mode = 0;
1245 gp->u = ' ';
1246 }
1247 }
1248 }
1249
1250 void
1251 tdeletechar(int n)
1252 {
1253 int dst, src, size;
1254 Glyph *line;
1255
1256 LIMIT(n, 0, term.col - term.c.x);
1257
1258 dst = term.c.x;
1259 src = term.c.x + n;
1260 size = term.col - src;
1261 line = term.line[term.c.y];
1262
1263 memmove(&line[dst], &line[src], size * sizeof(Glyph));
1264 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1265 }
1266
1267 void
1268 tinsertblank(int n)
1269 {
1270 int dst, src, size;
1271 Glyph *line;
1272
1273 LIMIT(n, 0, term.col - term.c.x);
1274
1275 dst = term.c.x + n;
1276 src = term.c.x;
1277 size = term.col - dst;
1278 line = term.line[term.c.y];
1279
1280 memmove(&line[dst], &line[src], size * sizeof(Glyph));
1281 tclearregion(src, term.c.y, dst - 1, term.c.y);
1282 }
1283
1284 void
1285 tinsertblankline(int n)
1286 {
1287 if (BETWEEN(term.c.y, term.top, term.bot))
1288 tscrolldown(term.c.y, n);
1289 }
1290
1291 void
1292 tdeleteline(int n)
1293 {
1294 if (BETWEEN(term.c.y, term.top, term.bot))
1295 tscrollup(term.c.y, n);
1296 }
1297
1298 int32_t
1299 tdefcolor(const int *attr, int *npar, int l)
1300 {
1301 int32_t idx = -1;
1302 uint r, g, b;
1303
1304 switch (attr[*npar + 1]) {
1305 case 2: /* direct color in RGB space */
1306 if (*npar + 4 >= l) {
1307 fprintf(stderr,
1308 "erresc(38): Incorrect number of parameters (%d)\n",
1309 *npar);
1310 break;
1311 }
1312 r = attr[*npar + 2];
1313 g = attr[*npar + 3];
1314 b = attr[*npar + 4];
1315 *npar += 4;
1316 if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1317 fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
1318 r, g, b);
1319 else
1320 idx = TRUECOLOR(r, g, b);
1321 break;
1322 case 5: /* indexed color */
1323 if (*npar + 2 >= l) {
1324 fprintf(stderr,
1325 "erresc(38): Incorrect number of parameters (%d)\n",
1326 *npar);
1327 break;
1328 }
1329 *npar += 2;
1330 if (!BETWEEN(attr[*npar], 0, 255))
1331 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1332 else
1333 idx = attr[*npar];
1334 break;
1335 case 0: /* implemented defined (only foreground) */
1336 case 1: /* transparent */
1337 case 3: /* direct color in CMY space */
1338 case 4: /* direct color in CMYK space */
1339 default:
1340 fprintf(stderr,
1341 "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1342 break;
1343 }
1344
1345 return idx;
1346 }
1347
1348 void
1349 tsetattr(const int *attr, int l)
1350 {
1351 int i;
1352 int32_t idx;
1353
1354 for (i = 0; i < l; i++) {
1355 switch (attr[i]) {
1356 case 0:
1357 term.c.attr.mode &= ~(
1358 ATTR_BOLD |
1359 ATTR_FAINT |
1360 ATTR_ITALIC |
1361 ATTR_UNDERLINE |
1362 ATTR_BLINK |
1363 ATTR_REVERSE |
1364 ATTR_INVISIBLE |
1365 ATTR_STRUCK );
1366 term.c.attr.fg = defaultfg;
1367 term.c.attr.bg = defaultbg;
1368 break;
1369 case 1:
1370 term.c.attr.mode |= ATTR_BOLD;
1371 break;
1372 case 2:
1373 term.c.attr.mode |= ATTR_FAINT;
1374 break;
1375 case 3:
1376 term.c.attr.mode |= ATTR_ITALIC;
1377 break;
1378 case 4:
1379 term.c.attr.mode |= ATTR_UNDERLINE;
1380 break;
1381 case 5: /* slow blink */
1382 /* FALLTHROUGH */
1383 case 6: /* rapid blink */
1384 term.c.attr.mode |= ATTR_BLINK;
1385 break;
1386 case 7:
1387 term.c.attr.mode |= ATTR_REVERSE;
1388 break;
1389 case 8:
1390 term.c.attr.mode |= ATTR_INVISIBLE;
1391 break;
1392 case 9:
1393 term.c.attr.mode |= ATTR_STRUCK;
1394 break;
1395 case 22:
1396 term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1397 break;
1398 case 23:
1399 term.c.attr.mode &= ~ATTR_ITALIC;
1400 break;
1401 case 24:
1402 term.c.attr.mode &= ~ATTR_UNDERLINE;
1403 break;
1404 case 25:
1405 term.c.attr.mode &= ~ATTR_BLINK;
1406 break;
1407 case 27:
1408 term.c.attr.mode &= ~ATTR_REVERSE;
1409 break;
1410 case 28:
1411 term.c.attr.mode &= ~ATTR_INVISIBLE;
1412 break;
1413 case 29:
1414 term.c.attr.mode &= ~ATTR_STRUCK;
1415 break;
1416 case 38:
1417 if ((idx = tdefcolor(attr, &i, l)) >= 0)
1418 term.c.attr.fg = idx;
1419 break;
1420 case 39:
1421 term.c.attr.fg = defaultfg;
1422 break;
1423 case 48:
1424 if ((idx = tdefcolor(attr, &i, l)) >= 0)
1425 term.c.attr.bg = idx;
1426 break;
1427 case 49:
1428 term.c.attr.bg = defaultbg;
1429 break;
1430 default:
1431 if (BETWEEN(attr[i], 30, 37)) {
1432 term.c.attr.fg = attr[i] - 30;
1433 } else if (BETWEEN(attr[i], 40, 47)) {
1434 term.c.attr.bg = attr[i] - 40;
1435 } else if (BETWEEN(attr[i], 90, 97)) {
1436 term.c.attr.fg = attr[i] - 90 + 8;
1437 } else if (BETWEEN(attr[i], 100, 107)) {
1438 term.c.attr.bg = attr[i] - 100 + 8;
1439 } else {
1440 fprintf(stderr,
1441 "erresc(default): gfx attr %d unknown\n",
1442 attr[i]);
1443 csidump();
1444 }
1445 break;
1446 }
1447 }
1448 }
1449
1450 void
1451 tsetscroll(int t, int b)
1452 {
1453 int temp;
1454
1455 LIMIT(t, 0, term.row-1);
1456 LIMIT(b, 0, term.row-1);
1457 if (t > b) {
1458 temp = t;
1459 t = b;
1460 b = temp;
1461 }
1462 term.top = t;
1463 term.bot = b;
1464 }
1465
1466 void
1467 tsetmode(int priv, int set, const int *args, int narg)
1468 {
1469 int alt; const int *lim;
1470
1471 for (lim = args + narg; args < lim; ++args) {
1472 if (priv) {
1473 switch (*args) {
1474 case 1: /* DECCKM -- Cursor key */
1475 xsetmode(set, MODE_APPCURSOR);
1476 break;
1477 case 5: /* DECSCNM -- Reverse video */
1478 xsetmode(set, MODE_REVERSE);
1479 break;
1480 case 6: /* DECOM -- Origin */
1481 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1482 tmoveato(0, 0);
1483 break;
1484 case 7: /* DECAWM -- Auto wrap */
1485 MODBIT(term.mode, set, MODE_WRAP);
1486 break;
1487 case 0: /* Error (IGNORED) */
1488 case 2: /* DECANM -- ANSI/VT52 (IGNORED) */
1489 case 3: /* DECCOLM -- Column (IGNORED) */
1490 case 4: /* DECSCLM -- Scroll (IGNORED) */
1491 case 8: /* DECARM -- Auto repeat (IGNORED) */
1492 case 18: /* DECPFF -- Printer feed (IGNORED) */
1493 case 19: /* DECPEX -- Printer extent (IGNORED) */
1494 case 42: /* DECNRCM -- National characters (IGNORED) */
1495 case 12: /* att610 -- Start blinking cursor (IGNORED) */
1496 break;
1497 case 25: /* DECTCEM -- Text Cursor Enable Mode */
1498 xsetmode(!set, MODE_HIDE);
1499 break;
1500 case 9: /* X10 mouse compatibility mode */
1501 xsetpointermotion(0);
1502 xsetmode(0, MODE_MOUSE);
1503 xsetmode(set, MODE_MOUSEX10);
1504 break;
1505 case 1000: /* 1000: report button press */
1506 xsetpointermotion(0);
1507 xsetmode(0, MODE_MOUSE);
1508 xsetmode(set, MODE_MOUSEBTN);
1509 break;
1510 case 1002: /* 1002: report motion on button press */
1511 xsetpointermotion(0);
1512 xsetmode(0, MODE_MOUSE);
1513 xsetmode(set, MODE_MOUSEMOTION);
1514 break;
1515 case 1003: /* 1003: enable all mouse motions */
1516 xsetpointermotion(set);
1517 xsetmode(0, MODE_MOUSE);
1518 xsetmode(set, MODE_MOUSEMANY);
1519 break;
1520 case 1004: /* 1004: send focus events to tty */
1521 xsetmode(set, MODE_FOCUS);
1522 break;
1523 case 1006: /* 1006: extended reporting mode */
1524 xsetmode(set, MODE_MOUSESGR);
1525 break;
1526 case 1034:
1527 xsetmode(set, MODE_8BIT);
1528 break;
1529 case 1049: /* swap screen & set/restore cursor as xterm */
1530 if (!allowaltscreen)
1531 break;
1532 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1533 /* FALLTHROUGH */
1534 case 47: /* swap screen */
1535 case 1047:
1536 if (!allowaltscreen)
1537 break;
1538 alt = IS_SET(MODE_ALTSCREEN);
1539 if (alt) {
1540 tclearregion(0, 0, term.col-1,
1541 term.row-1);
1542 }
1543 if (set ^ alt) /* set is always 1 or 0 */
1544 tswapscreen();
1545 if (*args != 1049)
1546 break;
1547 /* FALLTHROUGH */
1548 case 1048:
1549 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1550 break;
1551 case 2004: /* 2004: bracketed paste mode */
1552 xsetmode(set, MODE_BRCKTPASTE);
1553 break;
1554 /* Not implemented mouse modes. See comments there. */
1555 case 1001: /* mouse highlight mode; can hang the
1556 terminal by design when implemented. */
1557 case 1005: /* UTF-8 mouse mode; will confuse
1558 applications not supporting UTF-8
1559 and luit. */
1560 case 1015: /* urxvt mangled mouse mode; incompatible
1561 and can be mistaken for other control
1562 codes. */
1563 break;
1564 default:
1565 fprintf(stderr,
1566 "erresc: unknown private set/reset mode %d\n",
1567 *args);
1568 break;
1569 }
1570 } else {
1571 switch (*args) {
1572 case 0: /* Error (IGNORED) */
1573 break;
1574 case 2:
1575 xsetmode(set, MODE_KBDLOCK);
1576 break;
1577 case 4: /* IRM -- Insertion-replacement */
1578 MODBIT(term.mode, set, MODE_INSERT);
1579 break;
1580 case 12: /* SRM -- Send/Receive */
1581 MODBIT(term.mode, !set, MODE_ECHO);
1582 break;
1583 case 20: /* LNM -- Linefeed/new line */
1584 MODBIT(term.mode, set, MODE_CRLF);
1585 break;
1586 default:
1587 fprintf(stderr,
1588 "erresc: unknown set/reset mode %d\n",
1589 *args);
1590 break;
1591 }
1592 }
1593 }
1594 }
1595
1596 void
1597 csihandle(void)
1598 {
1599 char buf[40];
1600 int len;
1601
1602 switch (csiescseq.mode[0]) {
1603 default:
1604 unknown:
1605 fprintf(stderr, "erresc: unknown csi ");
1606 csidump();
1607 /* die(""); */
1608 break;
1609 case '@': /* ICH -- Insert <n> blank char */
1610 DEFAULT(csiescseq.arg[0], 1);
1611 tinsertblank(csiescseq.arg[0]);
1612 break;
1613 case 'A': /* CUU -- Cursor <n> Up */
1614 DEFAULT(csiescseq.arg[0], 1);
1615 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1616 break;
1617 case 'B': /* CUD -- Cursor <n> Down */
1618 case 'e': /* VPR --Cursor <n> Down */
1619 DEFAULT(csiescseq.arg[0], 1);
1620 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1621 break;
1622 case 'i': /* MC -- Media Copy */
1623 switch (csiescseq.arg[0]) {
1624 case 0:
1625 tdump();
1626 break;
1627 case 1:
1628 tdumpline(term.c.y);
1629 break;
1630 case 2:
1631 tdumpsel();
1632 break;
1633 case 4:
1634 term.mode &= ~MODE_PRINT;
1635 break;
1636 case 5:
1637 term.mode |= MODE_PRINT;
1638 break;
1639 }
1640 break;
1641 case 'c': /* DA -- Device Attributes */
1642 if (csiescseq.arg[0] == 0)
1643 ttywrite(vtiden, strlen(vtiden), 0);
1644 break;
1645 case 'b': /* REP -- if last char is printable print it <n> more times */
1646 DEFAULT(csiescseq.arg[0], 1);
1647 if (term.lastc)
1648 while (csiescseq.arg[0]-- > 0)
1649 tputc(term.lastc);
1650 break;
1651 case 'C': /* CUF -- Cursor <n> Forward */
1652 case 'a': /* HPR -- Cursor <n> Forward */
1653 DEFAULT(csiescseq.arg[0], 1);
1654 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1655 break;
1656 case 'D': /* CUB -- Cursor <n> Backward */
1657 DEFAULT(csiescseq.arg[0], 1);
1658 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1659 break;
1660 case 'E': /* CNL -- Cursor <n> Down and first col */
1661 DEFAULT(csiescseq.arg[0], 1);
1662 tmoveto(0, term.c.y+csiescseq.arg[0]);
1663 break;
1664 case 'F': /* CPL -- Cursor <n> Up and first col */
1665 DEFAULT(csiescseq.arg[0], 1);
1666 tmoveto(0, term.c.y-csiescseq.arg[0]);
1667 break;
1668 case 'g': /* TBC -- Tabulation clear */
1669 switch (csiescseq.arg[0]) {
1670 case 0: /* clear current tab stop */
1671 term.tabs[term.c.x] = 0;
1672 break;
1673 case 3: /* clear all the tabs */
1674 memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1675 break;
1676 default:
1677 goto unknown;
1678 }
1679 break;
1680 case 'G': /* CHA -- Move to <col> */
1681 case '`': /* HPA */
1682 DEFAULT(csiescseq.arg[0], 1);
1683 tmoveto(csiescseq.arg[0]-1, term.c.y);
1684 break;
1685 case 'H': /* CUP -- Move to <row> <col> */
1686 case 'f': /* HVP */
1687 DEFAULT(csiescseq.arg[0], 1);
1688 DEFAULT(csiescseq.arg[1], 1);
1689 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1690 break;
1691 case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1692 DEFAULT(csiescseq.arg[0], 1);
1693 tputtab(csiescseq.arg[0]);
1694 break;
1695 case 'J': /* ED -- Clear screen */
1696 switch (csiescseq.arg[0]) {
1697 case 0: /* below */
1698 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1699 if (term.c.y < term.row-1) {
1700 tclearregion(0, term.c.y+1, term.col-1,
1701 term.row-1);
1702 }
1703 break;
1704 case 1: /* above */
1705 if (term.c.y > 1)
1706 tclearregion(0, 0, term.col-1, term.c.y-1);
1707 tclearregion(0, term.c.y, term.c.x, term.c.y);
1708 break;
1709 case 2: /* all */
1710 tclearregion(0, 0, term.col-1, term.row-1);
1711 break;
1712 default:
1713 goto unknown;
1714 }
1715 break;
1716 case 'K': /* EL -- Clear line */
1717 switch (csiescseq.arg[0]) {
1718 case 0: /* right */
1719 tclearregion(term.c.x, term.c.y, term.col-1,
1720 term.c.y);
1721 break;
1722 case 1: /* left */
1723 tclearregion(0, term.c.y, term.c.x, term.c.y);
1724 break;
1725 case 2: /* all */
1726 tclearregion(0, term.c.y, term.col-1, term.c.y);
1727 break;
1728 }
1729 break;
1730 case 'S': /* SU -- Scroll <n> line up */
1731 DEFAULT(csiescseq.arg[0], 1);
1732 tscrollup(term.top, csiescseq.arg[0]);
1733 break;
1734 case 'T': /* SD -- Scroll <n> line down */
1735 DEFAULT(csiescseq.arg[0], 1);
1736 tscrolldown(term.top, csiescseq.arg[0]);
1737 break;
1738 case 'L': /* IL -- Insert <n> blank lines */
1739 DEFAULT(csiescseq.arg[0], 1);
1740 tinsertblankline(csiescseq.arg[0]);
1741 break;
1742 case 'l': /* RM -- Reset Mode */
1743 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1744 break;
1745 case 'M': /* DL -- Delete <n> lines */
1746 DEFAULT(csiescseq.arg[0], 1);
1747 tdeleteline(csiescseq.arg[0]);
1748 break;
1749 case 'X': /* ECH -- Erase <n> char */
1750 DEFAULT(csiescseq.arg[0], 1);
1751 tclearregion(term.c.x, term.c.y,
1752 term.c.x + csiescseq.arg[0] - 1, term.c.y);
1753 break;
1754 case 'P': /* DCH -- Delete <n> char */
1755 DEFAULT(csiescseq.arg[0], 1);
1756 tdeletechar(csiescseq.arg[0]);
1757 break;
1758 case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1759 DEFAULT(csiescseq.arg[0], 1);
1760 tputtab(-csiescseq.arg[0]);
1761 break;
1762 case 'd': /* VPA -- Move to <row> */
1763 DEFAULT(csiescseq.arg[0], 1);
1764 tmoveato(term.c.x, csiescseq.arg[0]-1);
1765 break;
1766 case 'h': /* SM -- Set terminal mode */
1767 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1768 break;
1769 case 'm': /* SGR -- Terminal attribute (color) */
1770 tsetattr(csiescseq.arg, csiescseq.narg);
1771 break;
1772 case 'n': /* DSR – Device Status Report (cursor position) */
1773 if (csiescseq.arg[0] == 6) {
1774 len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
1775 term.c.y+1, term.c.x+1);
1776 ttywrite(buf, len, 0);
1777 }
1778 break;
1779 case 'r': /* DECSTBM -- Set Scrolling Region */
1780 if (csiescseq.priv) {
1781 goto unknown;
1782 } else {
1783 DEFAULT(csiescseq.arg[0], 1);
1784 DEFAULT(csiescseq.arg[1], term.row);
1785 tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1786 tmoveato(0, 0);
1787 }
1788 break;
1789 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1790 tcursor(CURSOR_SAVE);
1791 break;
1792 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1793 tcursor(CURSOR_LOAD);
1794 break;
1795 case ' ':
1796 switch (csiescseq.mode[1]) {
1797 case 'q': /* DECSCUSR -- Set Cursor Style */
1798 if (xsetcursor(csiescseq.arg[0]))
1799 goto unknown;
1800 break;
1801 default:
1802 goto unknown;
1803 }
1804 break;
1805 }
1806 }
1807
1808 void
1809 csidump(void)
1810 {
1811 size_t i;
1812 uint c;
1813
1814 fprintf(stderr, "ESC[");
1815 for (i = 0; i < csiescseq.len; i++) {
1816 c = csiescseq.buf[i] & 0xff;
1817 if (isprint(c)) {
1818 putc(c, stderr);
1819 } else if (c == '\n') {
1820 fprintf(stderr, "(\\n)");
1821 } else if (c == '\r') {
1822 fprintf(stderr, "(\\r)");
1823 } else if (c == 0x1b) {
1824 fprintf(stderr, "(\\e)");
1825 } else {
1826 fprintf(stderr, "(%02x)", c);
1827 }
1828 }
1829 putc('\n', stderr);
1830 }
1831
1832 void
1833 csireset(void)
1834 {
1835 memset(&csiescseq, 0, sizeof(csiescseq));
1836 }
1837
1838 void
1839 osc_color_response(int num, int index, int is_osc4)
1840 {
1841 int n;
1842 char buf[32];
1843 unsigned char r, g, b;
1844
1845 if (xgetcolor(is_osc4 ? num : index, &r, &g, &b)) {
1846 fprintf(stderr, "erresc: failed to fetch %s color %d\n",
1847 is_osc4 ? "osc4" : "osc",
1848 is_osc4 ? num : index);
1849 return;
1850 }
1851
1852 n = snprintf(buf, sizeof buf, "\033]%s%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
1853 is_osc4 ? "4;" : "", num, r, r, g, g, b, b);
1854 if (n < 0 || n >= sizeof(buf)) {
1855 fprintf(stderr, "error: %s while printing %s response\n",
1856 n < 0 ? "snprintf failed" : "truncation occurred",
1857 is_osc4 ? "osc4" : "osc");
1858 } else {
1859 ttywrite(buf, n, 1);
1860 }
1861 }
1862
1863 void
1864 strhandle(void)
1865 {
1866 char *p = NULL, *dec;
1867 int j, narg, par;
1868 const struct { int idx; char *str; } osc_table[] = {
1869 { defaultfg, "foreground" },
1870 { defaultbg, "background" },
1871 { defaultcs, "cursor" }
1872 };
1873
1874 term.esc &= ~(ESC_STR_END|ESC_STR);
1875 strparse();
1876 par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;
1877
1878 switch (strescseq.type) {
1879 case ']': /* OSC -- Operating System Command */
1880 switch (par) {
1881 case 0:
1882 if (narg > 1) {
1883 xsettitle(strescseq.args[1]);
1884 xseticontitle(strescseq.args[1]);
1885 }
1886 return;
1887 case 1:
1888 if (narg > 1)
1889 xseticontitle(strescseq.args[1]);
1890 return;
1891 case 2:
1892 if (narg > 1)
1893 xsettitle(strescseq.args[1]);
1894 return;
1895 case 52:
1896 if (narg > 2 && allowwindowops) {
1897 dec = base64dec(strescseq.args[2]);
1898 if (dec) {
1899 xsetsel(dec);
1900 xclipcopy();
1901 } else {
1902 fprintf(stderr, "erresc: invalid base64\n");
1903 }
1904 }
1905 return;
1906 case 10:
1907 case 11:
1908 case 12:
1909 if (narg < 2)
1910 break;
1911 p = strescseq.args[1];
1912 if ((j = par - 10) < 0 || j >= LEN(osc_table))
1913 break; /* shouldn't be possible */
1914
1915 if (!strcmp(p, "?")) {
1916 osc_color_response(par, osc_table[j].idx, 0);
1917 } else if (xsetcolorname(osc_table[j].idx, p)) {
1918 fprintf(stderr, "erresc: invalid %s color: %s\n",
1919 osc_table[j].str, p);
1920 } else {
1921 tfulldirt();
1922 }
1923 return;
1924 case 4: /* color set */
1925 if (narg < 3)
1926 break;
1927 p = strescseq.args[2];
1928 /* FALLTHROUGH */
1929 case 104: /* color reset */
1930 j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
1931
1932 if (p && !strcmp(p, "?")) {
1933 osc_color_response(j, 0, 1);
1934 } else if (xsetcolorname(j, p)) {
1935 if (par == 104 && narg <= 1)
1936 return; /* color reset without parameter */
1937 fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",
1938 j, p ? p : "(null)");
1939 } else {
1940 /*
1941 * TODO if defaultbg color is changed, borders
1942 * are dirty
1943 */
1944 tfulldirt();
1945 }
1946 return;
1947 }
1948 break;
1949 case 'k': /* old title set compatibility */
1950 xsettitle(strescseq.args[0]);
1951 return;
1952 case 'P': /* DCS -- Device Control String */
1953 case '_': /* APC -- Application Program Command */
1954 case '^': /* PM -- Privacy Message */
1955 return;
1956 }
1957
1958 fprintf(stderr, "erresc: unknown str ");
1959 strdump();
1960 }
1961
1962 void
1963 strparse(void)
1964 {
1965 int c;
1966 char *p = strescseq.buf;
1967
1968 strescseq.narg = 0;
1969 strescseq.buf[strescseq.len] = '\0';
1970
1971 if (*p == '\0')
1972 return;
1973
1974 while (strescseq.narg < STR_ARG_SIZ) {
1975 strescseq.args[strescseq.narg++] = p;
1976 while ((c = *p) != ';' && c != '\0')
1977 ++p;
1978 if (c == '\0')
1979 return;
1980 *p++ = '\0';
1981 }
1982 }
1983
1984 void
1985 strdump(void)
1986 {
1987 size_t i;
1988 uint c;
1989
1990 fprintf(stderr, "ESC%c", strescseq.type);
1991 for (i = 0; i < strescseq.len; i++) {
1992 c = strescseq.buf[i] & 0xff;
1993 if (c == '\0') {
1994 putc('\n', stderr);
1995 return;
1996 } else if (isprint(c)) {
1997 putc(c, stderr);
1998 } else if (c == '\n') {
1999 fprintf(stderr, "(\\n)");
2000 } else if (c == '\r') {
2001 fprintf(stderr, "(\\r)");
2002 } else if (c == 0x1b) {
2003 fprintf(stderr, "(\\e)");
2004 } else {
2005 fprintf(stderr, "(%02x)", c);
2006 }
2007 }
2008 fprintf(stderr, "ESC\\\n");
2009 }
2010
2011 void
2012 strreset(void)
2013 {
2014 strescseq = (STREscape){
2015 .buf = xrealloc(strescseq.buf, STR_BUF_SIZ),
2016 .siz = STR_BUF_SIZ,
2017 };
2018 }
2019
2020 void
2021 sendbreak(const Arg *arg)
2022 {
2023 if (tcsendbreak(cmdfd, 0))
2024 perror("Error sending break");
2025 }
2026
2027 void
2028 tprinter(char *s, size_t len)
2029 {
2030 if (iofd != -1 && xwrite(iofd, s, len) < 0) {
2031 perror("Error writing to output file");
2032 close(iofd);
2033 iofd = -1;
2034 }
2035 }
2036
2037 void
2038 toggleprinter(const Arg *arg)
2039 {
2040 term.mode ^= MODE_PRINT;
2041 }
2042
2043 void
2044 printscreen(const Arg *arg)
2045 {
2046 tdump();
2047 }
2048
2049 void
2050 printsel(const Arg *arg)
2051 {
2052 tdumpsel();
2053 }
2054
2055 void
2056 tdumpsel(void)
2057 {
2058 char *ptr;
2059
2060 if ((ptr = getsel())) {
2061 tprinter(ptr, strlen(ptr));
2062 free(ptr);
2063 }
2064 }
2065
2066 void
2067 tdumpline(int n)
2068 {
2069 char buf[UTF_SIZ];
2070 const Glyph *bp, *end;
2071
2072 bp = &term.line[n][0];
2073 end = &bp[MIN(tlinelen(n), term.col) - 1];
2074 if (bp != end || bp->u != ' ') {
2075 for ( ; bp <= end; ++bp)
2076 tprinter(buf, utf8encode(bp->u, buf));
2077 }
2078 tprinter("\n", 1);
2079 }
2080
2081 void
2082 tdump(void)
2083 {
2084 int i;
2085
2086 for (i = 0; i < term.row; ++i)
2087 tdumpline(i);
2088 }
2089
2090 void
2091 tputtab(int n)
2092 {
2093 uint x = term.c.x;
2094
2095 if (n > 0) {
2096 while (x < term.col && n--)
2097 for (++x; x < term.col && !term.tabs[x]; ++x)
2098 /* nothing */ ;
2099 } else if (n < 0) {
2100 while (x > 0 && n++)
2101 for (--x; x > 0 && !term.tabs[x]; --x)
2102 /* nothing */ ;
2103 }
2104 term.c.x = LIMIT(x, 0, term.col-1);
2105 }
2106
2107 void
2108 tdefutf8(char ascii)
2109 {
2110 if (ascii == 'G')
2111 term.mode |= MODE_UTF8;
2112 else if (ascii == '@')
2113 term.mode &= ~MODE_UTF8;
2114 }
2115
2116 void
2117 tdeftran(char ascii)
2118 {
2119 static char cs[] = "0B";
2120 static int vcs[] = {CS_GRAPHIC0, CS_USA};
2121 char *p;
2122
2123 if ((p = strchr(cs, ascii)) == NULL) {
2124 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2125 } else {
2126 term.trantbl[term.icharset] = vcs[p - cs];
2127 }
2128 }
2129
2130 void
2131 tdectest(char c)
2132 {
2133 int x, y;
2134
2135 if (c == '8') { /* DEC screen alignment test. */
2136 for (x = 0; x < term.col; ++x) {
2137 for (y = 0; y < term.row; ++y)
2138 tsetchar('E', &term.c.attr, x, y);
2139 }
2140 }
2141 }
2142
2143 void
2144 tstrsequence(uchar c)
2145 {
2146 switch (c) {
2147 case 0x90: /* DCS -- Device Control String */
2148 c = 'P';
2149 break;
2150 case 0x9f: /* APC -- Application Program Command */
2151 c = '_';
2152 break;
2153 case 0x9e: /* PM -- Privacy Message */
2154 c = '^';
2155 break;
2156 case 0x9d: /* OSC -- Operating System Command */
2157 c = ']';
2158 break;
2159 }
2160 strreset();
2161 strescseq.type = c;
2162 term.esc |= ESC_STR;
2163 }
2164
2165 void
2166 tcontrolcode(uchar ascii)
2167 {
2168 switch (ascii) {
2169 case '\t': /* HT */
2170 tputtab(1);
2171 return;
2172 case '\b': /* BS */
2173 tmoveto(term.c.x-1, term.c.y);
2174 return;
2175 case '\r': /* CR */
2176 tmoveto(0, term.c.y);
2177 return;
2178 case '\f': /* LF */
2179 case '\v': /* VT */
2180 case '\n': /* LF */
2181 /* go to first col if the mode is set */
2182 tnewline(IS_SET(MODE_CRLF));
2183 return;
2184 case '\a': /* BEL */
2185 if (term.esc & ESC_STR_END) {
2186 /* backwards compatibility to xterm */
2187 strhandle();
2188 } else {
2189 xbell();
2190 }
2191 break;
2192 case '\033': /* ESC */
2193 csireset();
2194 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2195 term.esc |= ESC_START;
2196 return;
2197 case '\016': /* SO (LS1 -- Locking shift 1) */
2198 case '\017': /* SI (LS0 -- Locking shift 0) */
2199 term.charset = 1 - (ascii - '\016');
2200 return;
2201 case '\032': /* SUB */
2202 tsetchar('?', &term.c.attr, term.c.x, term.c.y);
2203 /* FALLTHROUGH */
2204 case '\030': /* CAN */
2205 csireset();
2206 break;
2207 case '\005': /* ENQ (IGNORED) */
2208 case '\000': /* NUL (IGNORED) */
2209 case '\021': /* XON (IGNORED) */
2210 case '\023': /* XOFF (IGNORED) */
2211 case 0177: /* DEL (IGNORED) */
2212 return;
2213 case 0x80: /* TODO: PAD */
2214 case 0x81: /* TODO: HOP */
2215 case 0x82: /* TODO: BPH */
2216 case 0x83: /* TODO: NBH */
2217 case 0x84: /* TODO: IND */
2218 break;
2219 case 0x85: /* NEL -- Next line */
2220 tnewline(1); /* always go to first col */
2221 break;
2222 case 0x86: /* TODO: SSA */
2223 case 0x87: /* TODO: ESA */
2224 break;
2225 case 0x88: /* HTS -- Horizontal tab stop */
2226 term.tabs[term.c.x] = 1;
2227 break;
2228 case 0x89: /* TODO: HTJ */
2229 case 0x8a: /* TODO: VTS */
2230 case 0x8b: /* TODO: PLD */
2231 case 0x8c: /* TODO: PLU */
2232 case 0x8d: /* TODO: RI */
2233 case 0x8e: /* TODO: SS2 */
2234 case 0x8f: /* TODO: SS3 */
2235 case 0x91: /* TODO: PU1 */
2236 case 0x92: /* TODO: PU2 */
2237 case 0x93: /* TODO: STS */
2238 case 0x94: /* TODO: CCH */
2239 case 0x95: /* TODO: MW */
2240 case 0x96: /* TODO: SPA */
2241 case 0x97: /* TODO: EPA */
2242 case 0x98: /* TODO: SOS */
2243 case 0x99: /* TODO: SGCI */
2244 break;
2245 case 0x9a: /* DECID -- Identify Terminal */
2246 ttywrite(vtiden, strlen(vtiden), 0);
2247 break;
2248 case 0x9b: /* TODO: CSI */
2249 case 0x9c: /* TODO: ST */
2250 break;
2251 case 0x90: /* DCS -- Device Control String */
2252 case 0x9d: /* OSC -- Operating System Command */
2253 case 0x9e: /* PM -- Privacy Message */
2254 case 0x9f: /* APC -- Application Program Command */
2255 tstrsequence(ascii);
2256 return;
2257 }
2258 /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2259 term.esc &= ~(ESC_STR_END|ESC_STR);
2260 }
2261
2262 /*
2263 * returns 1 when the sequence is finished and it hasn't to read
2264 * more characters for this sequence, otherwise 0
2265 */
2266 int
2267 eschandle(uchar ascii)
2268 {
2269 switch (ascii) {
2270 case '[':
2271 term.esc |= ESC_CSI;
2272 return 0;
2273 case '#':
2274 term.esc |= ESC_TEST;
2275 return 0;
2276 case '%':
2277 term.esc |= ESC_UTF8;
2278 return 0;
2279 case 'P': /* DCS -- Device Control String */
2280 case '_': /* APC -- Application Program Command */
2281 case '^': /* PM -- Privacy Message */
2282 case ']': /* OSC -- Operating System Command */
2283 case 'k': /* old title set compatibility */
2284 tstrsequence(ascii);
2285 return 0;
2286 case 'n': /* LS2 -- Locking shift 2 */
2287 case 'o': /* LS3 -- Locking shift 3 */
2288 term.charset = 2 + (ascii - 'n');
2289 break;
2290 case '(': /* GZD4 -- set primary charset G0 */
2291 case ')': /* G1D4 -- set secondary charset G1 */
2292 case '*': /* G2D4 -- set tertiary charset G2 */
2293 case '+': /* G3D4 -- set quaternary charset G3 */
2294 term.icharset = ascii - '(';
2295 term.esc |= ESC_ALTCHARSET;
2296 return 0;
2297 case 'D': /* IND -- Linefeed */
2298 if (term.c.y == term.bot) {
2299 tscrollup(term.top, 1);
2300 } else {
2301 tmoveto(term.c.x, term.c.y+1);
2302 }
2303 break;
2304 case 'E': /* NEL -- Next line */
2305 tnewline(1); /* always go to first col */
2306 break;
2307 case 'H': /* HTS -- Horizontal tab stop */
2308 term.tabs[term.c.x] = 1;
2309 break;
2310 case 'M': /* RI -- Reverse index */
2311 if (term.c.y == term.top) {
2312 tscrolldown(term.top, 1);
2313 } else {
2314 tmoveto(term.c.x, term.c.y-1);
2315 }
2316 break;
2317 case 'Z': /* DECID -- Identify Terminal */
2318 ttywrite(vtiden, strlen(vtiden), 0);
2319 break;
2320 case 'c': /* RIS -- Reset to initial state */
2321 treset();
2322 resettitle();
2323 xloadcols();
2324 break;
2325 case '=': /* DECPAM -- Application keypad */
2326 xsetmode(1, MODE_APPKEYPAD);
2327 break;
2328 case '>': /* DECPNM -- Normal keypad */
2329 xsetmode(0, MODE_APPKEYPAD);
2330 break;
2331 case '7': /* DECSC -- Save Cursor */
2332 tcursor(CURSOR_SAVE);
2333 break;
2334 case '8': /* DECRC -- Restore Cursor */
2335 tcursor(CURSOR_LOAD);
2336 break;
2337 case '\\': /* ST -- String Terminator */
2338 if (term.esc & ESC_STR_END)
2339 strhandle();
2340 break;
2341 default:
2342 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2343 (uchar) ascii, isprint(ascii)? ascii:'.');
2344 break;
2345 }
2346 return 1;
2347 }
2348
2349 void
2350 tputc(Rune u)
2351 {
2352 char c[UTF_SIZ];
2353 int control;
2354 int width, len;
2355 Glyph *gp;
2356
2357 control = ISCONTROL(u);
2358 if (u < 127 || !IS_SET(MODE_UTF8)) {
2359 c[0] = u;
2360 width = len = 1;
2361 } else {
2362 len = utf8encode(u, c);
2363 if (!control && (width = wcwidth(u)) == -1)
2364 width = 1;
2365 }
2366
2367 if (IS_SET(MODE_PRINT))
2368 tprinter(c, len);
2369
2370 /*
2371 * STR sequence must be checked before anything else
2372 * because it uses all following characters until it
2373 * receives a ESC, a SUB, a ST or any other C1 control
2374 * character.
2375 */
2376 if (term.esc & ESC_STR) {
2377 if (u == '\a' || u == 030 || u == 032 || u == 033 ||
2378 ISCONTROLC1(u)) {
2379 term.esc &= ~(ESC_START|ESC_STR);
2380 term.esc |= ESC_STR_END;
2381 goto check_control_code;
2382 }
2383
2384 if (strescseq.len+len >= strescseq.siz) {
2385 /*
2386 * Here is a bug in terminals. If the user never sends
2387 * some code to stop the str or esc command, then st
2388 * will stop responding. But this is better than
2389 * silently failing with unknown characters. At least
2390 * then users will report back.
2391 *
2392 * In the case users ever get fixed, here is the code:
2393 */
2394 /*
2395 * term.esc = 0;
2396 * strhandle();
2397 */
2398 if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
2399 return;
2400 strescseq.siz *= 2;
2401 strescseq.buf = xrealloc(strescseq.buf, strescseq.siz);
2402 }
2403
2404 memmove(&strescseq.buf[strescseq.len], c, len);
2405 strescseq.len += len;
2406 return;
2407 }
2408
2409 check_control_code:
2410 /*
2411 * Actions of control codes must be performed as soon they arrive
2412 * because they can be embedded inside a control sequence, and
2413 * they must not cause conflicts with sequences.
2414 */
2415 if (control) {
2416 tcontrolcode(u);
2417 /*
2418 * control codes are not shown ever
2419 */
2420 if (!term.esc)
2421 term.lastc = 0;
2422 return;
2423 } else if (term.esc & ESC_START) {
2424 if (term.esc & ESC_CSI) {
2425 csiescseq.buf[csiescseq.len++] = u;
2426 if (BETWEEN(u, 0x40, 0x7E)
2427 || csiescseq.len >= \
2428 sizeof(csiescseq.buf)-1) {
2429 term.esc = 0;
2430 csiparse();
2431 csihandle();
2432 }
2433 return;
2434 } else if (term.esc & ESC_UTF8) {
2435 tdefutf8(u);
2436 } else if (term.esc & ESC_ALTCHARSET) {
2437 tdeftran(u);
2438 } else if (term.esc & ESC_TEST) {
2439 tdectest(u);
2440 } else {
2441 if (!eschandle(u))
2442 return;
2443 /* sequence already finished */
2444 }
2445 term.esc = 0;
2446 /*
2447 * All characters which form part of a sequence are not
2448 * printed
2449 */
2450 return;
2451 }
2452 if (selected(term.c.x, term.c.y))
2453 selclear();
2454
2455 gp = &term.line[term.c.y][term.c.x];
2456 if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2457 gp->mode |= ATTR_WRAP;
2458 tnewline(1);
2459 gp = &term.line[term.c.y][term.c.x];
2460 }
2461
2462 if (IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2463 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2464
2465 if (term.c.x+width > term.col) {
2466 tnewline(1);
2467 gp = &term.line[term.c.y][term.c.x];
2468 }
2469
2470 tsetchar(u, &term.c.attr, term.c.x, term.c.y);
2471 term.lastc = u;
2472
2473 if (width == 2) {
2474 gp->mode |= ATTR_WIDE;
2475 if (term.c.x+1 < term.col) {
2476 if (gp[1].mode == ATTR_WIDE && term.c.x+2 < term.col) {
2477 gp[2].u = ' ';
2478 gp[2].mode &= ~ATTR_WDUMMY;
2479 }
2480 gp[1].u = '\0';
2481 gp[1].mode = ATTR_WDUMMY;
2482 }
2483 }
2484 if (term.c.x+width < term.col) {
2485 tmoveto(term.c.x+width, term.c.y);
2486 } else {
2487 term.c.state |= CURSOR_WRAPNEXT;
2488 }
2489 }
2490
2491 int
2492 twrite(const char *buf, int buflen, int show_ctrl)
2493 {
2494 int charsize;
2495 Rune u;
2496 int n;
2497
2498 for (n = 0; n < buflen; n += charsize) {
2499 if (IS_SET(MODE_UTF8)) {
2500 /* process a complete utf8 char */
2501 charsize = utf8decode(buf + n, &u, buflen - n);
2502 if (charsize == 0)
2503 break;
2504 } else {
2505 u = buf[n] & 0xFF;
2506 charsize = 1;
2507 }
2508 if (show_ctrl && ISCONTROL(u)) {
2509 if (u & 0x80) {
2510 u &= 0x7f;
2511 tputc('^');
2512 tputc('[');
2513 } else if (u != '\n' && u != '\r' && u != '\t') {
2514 u ^= 0x40;
2515 tputc('^');
2516 }
2517 }
2518 tputc(u);
2519 }
2520 return n;
2521 }
2522
2523 void
2524 tresize(int col, int row)
2525 {
2526 int i;
2527 int minrow = MIN(row, term.row);
2528 int mincol = MIN(col, term.col);
2529 int *bp;
2530 TCursor c;
2531
2532 if (col < 1 || row < 1) {
2533 fprintf(stderr,
2534 "tresize: error resizing to %dx%d\n", col, row);
2535 return;
2536 }
2537
2538 /*
2539 * slide screen to keep cursor where we expect it -
2540 * tscrollup would work here, but we can optimize to
2541 * memmove because we're freeing the earlier lines
2542 */
2543 for (i = 0; i <= term.c.y - row; i++) {
2544 free(term.line[i]);
2545 free(term.alt[i]);
2546 }
2547 /* ensure that both src and dst are not NULL */
2548 if (i > 0) {
2549 memmove(term.line, term.line + i, row * sizeof(Line));
2550 memmove(term.alt, term.alt + i, row * sizeof(Line));
2551 }
2552 for (i += row; i < term.row; i++) {
2553 free(term.line[i]);
2554 free(term.alt[i]);
2555 }
2556
2557 /* resize to new height */
2558 term.line = xrealloc(term.line, row * sizeof(Line));
2559 term.alt = xrealloc(term.alt, row * sizeof(Line));
2560 term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2561 term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2562
2563 /* resize each row to new width, zero-pad if needed */
2564 for (i = 0; i < minrow; i++) {
2565 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2566 term.alt[i] = xrealloc(term.alt[i], col * sizeof(Glyph));
2567 }
2568
2569 /* allocate any new rows */
2570 for (/* i = minrow */; i < row; i++) {
2571 term.line[i] = xmalloc(col * sizeof(Glyph));
2572 term.alt[i] = xmalloc(col * sizeof(Glyph));
2573 }
2574 if (col > term.col) {
2575 bp = term.tabs + term.col;
2576
2577 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2578 while (--bp > term.tabs && !*bp)
2579 /* nothing */ ;
2580 for (bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2581 *bp = 1;
2582 }
2583 /* update terminal size */
2584 term.col = col;
2585 term.row = row;
2586 /* reset scrolling region */
2587 tsetscroll(0, row-1);
2588 /* make use of the LIMIT in tmoveto */
2589 tmoveto(term.c.x, term.c.y);
2590 /* Clearing both screens (it makes dirty all lines) */
2591 c = term.c;
2592 for (i = 0; i < 2; i++) {
2593 if (mincol < col && 0 < minrow) {
2594 tclearregion(mincol, 0, col - 1, minrow - 1);
2595 }
2596 if (0 < col && minrow < row) {
2597 tclearregion(0, minrow, col - 1, row - 1);
2598 }
2599 tswapscreen();
2600 tcursor(CURSOR_LOAD);
2601 }
2602 term.c = c;
2603 }
2604
2605 void
2606 resettitle(void)
2607 {
2608 xsettitle(NULL);
2609 }
2610
2611 void
2612 drawregion(int x1, int y1, int x2, int y2)
2613 {
2614 int y;
2615
2616 for (y = y1; y < y2; y++) {
2617 if (!term.dirty[y])
2618 continue;
2619
2620 term.dirty[y] = 0;
2621 xdrawline(term.line[y], x1, y, x2);
2622 }
2623 }
2624
2625 void
2626 draw(void)
2627 {
2628 int cx = term.c.x, ocx = term.ocx, ocy = term.ocy;
2629
2630 if (!xstartdraw())
2631 return;
2632
2633 /* adjust cursor position */
2634 LIMIT(term.ocx, 0, term.col-1);
2635 LIMIT(term.ocy, 0, term.row-1);
2636 if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY)
2637 term.ocx--;
2638 if (term.line[term.c.y][cx].mode & ATTR_WDUMMY)
2639 cx--;
2640
2641 drawregion(0, 0, term.col, term.row);
2642 xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
2643 term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
2644 term.ocx = cx;
2645 term.ocy = term.c.y;
2646 xfinishdraw();
2647 if (ocx != term.ocx || ocy != term.ocy)
2648 xximspot(term.ocx, term.ocy);
2649 }
2650
2651 void
2652 redraw(void)
2653 {
2654 tfulldirt();
2655 draw();
2656 }
simple terminal