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