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