xref: /freebsd/contrib/libedit/el.c (revision e17f5b1d307b7b8910d67883e57a9604305906d5)
1 /*	$NetBSD: el.c,v 1.99 2019/07/23 10:18:52 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 1992, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * Christos Zoulas of Cornell University.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #include "config.h"
36 #if !defined(lint) && !defined(SCCSID)
37 #if 0
38 static char sccsid[] = "@(#)el.c	8.2 (Berkeley) 1/3/94";
39 #else
40 __RCSID("$NetBSD: el.c,v 1.99 2019/07/23 10:18:52 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43 
44 /*
45  * el.c: EditLine interface functions
46  */
47 #include <sys/types.h>
48 #include <sys/param.h>
49 #include <ctype.h>
50 #include <langinfo.h>
51 #include <locale.h>
52 #include <stdarg.h>
53 #include <stdlib.h>
54 #include <string.h>
55 
56 #include "el.h"
57 #include "parse.h"
58 #include "read.h"
59 
60 /* el_init():
61  *	Initialize editline and set default parameters.
62  */
63 EditLine *
64 el_init(const char *prog, FILE *fin, FILE *fout, FILE *ferr)
65 {
66     return el_init_fd(prog, fin, fout, ferr, fileno(fin), fileno(fout),
67 	fileno(ferr));
68 }
69 
70 libedit_private EditLine *
71 el_init_internal(const char *prog, FILE *fin, FILE *fout, FILE *ferr,
72     int fdin, int fdout, int fderr, int flags)
73 {
74 	EditLine *el = el_calloc(1, sizeof(*el));
75 
76 	if (el == NULL)
77 		return NULL;
78 
79 	el->el_infile = fin;
80 	el->el_outfile = fout;
81 	el->el_errfile = ferr;
82 
83 	el->el_infd = fdin;
84 	el->el_outfd = fdout;
85 	el->el_errfd = fderr;
86 
87 	el->el_prog = wcsdup(ct_decode_string(prog, &el->el_scratch));
88 	if (el->el_prog == NULL) {
89 		el_free(el);
90 		return NULL;
91 	}
92 
93 	/*
94          * Initialize all the modules. Order is important!!!
95          */
96 	el->el_flags = flags;
97 
98 	if (terminal_init(el) == -1) {
99 		el_free(el->el_prog);
100 		el_free(el);
101 		return NULL;
102 	}
103 	(void) keymacro_init(el);
104 	(void) map_init(el);
105 	if (tty_init(el) == -1)
106 		el->el_flags |= NO_TTY;
107 	(void) ch_init(el);
108 	(void) search_init(el);
109 	(void) hist_init(el);
110 	(void) prompt_init(el);
111 	(void) sig_init(el);
112 	(void) literal_init(el);
113 	if (read_init(el) == -1) {
114 		el_end(el);
115 		return NULL;
116 	}
117 	return el;
118 }
119 
120 EditLine *
121 el_init_fd(const char *prog, FILE *fin, FILE *fout, FILE *ferr,
122     int fdin, int fdout, int fderr)
123 {
124 	return el_init_internal(prog, fin, fout, ferr, fdin, fdout, fderr, 0);
125 }
126 
127 /* el_end():
128  *	Clean up.
129  */
130 void
131 el_end(EditLine *el)
132 {
133 
134 	if (el == NULL)
135 		return;
136 
137 	el_reset(el);
138 
139 	terminal_end(el);
140 	keymacro_end(el);
141 	map_end(el);
142 	if (!(el->el_flags & NO_TTY))
143 		tty_end(el, TCSAFLUSH);
144 	ch_end(el);
145 	read_end(el->el_read);
146 	search_end(el);
147 	hist_end(el);
148 	prompt_end(el);
149 	sig_end(el);
150 	literal_end(el);
151 
152 	el_free(el->el_prog);
153 	el_free(el->el_visual.cbuff);
154 	el_free(el->el_visual.wbuff);
155 	el_free(el->el_scratch.cbuff);
156 	el_free(el->el_scratch.wbuff);
157 	el_free(el->el_lgcyconv.cbuff);
158 	el_free(el->el_lgcyconv.wbuff);
159 	el_free(el);
160 }
161 
162 
163 /* el_reset():
164  *	Reset the tty and the parser
165  */
166 void
167 el_reset(EditLine *el)
168 {
169 
170 	tty_cookedmode(el);
171 	ch_reset(el);		/* XXX: Do we want that? */
172 }
173 
174 
175 /* el_set():
176  *	set the editline parameters
177  */
178 int
179 el_wset(EditLine *el, int op, ...)
180 {
181 	va_list ap;
182 	int rv = 0;
183 
184 	if (el == NULL)
185 		return -1;
186 	va_start(ap, op);
187 
188 	switch (op) {
189 	case EL_PROMPT:
190 	case EL_RPROMPT: {
191 		el_pfunc_t p = va_arg(ap, el_pfunc_t);
192 
193 		rv = prompt_set(el, p, 0, op, 1);
194 		break;
195 	}
196 
197 	case EL_RESIZE: {
198 		el_zfunc_t p = va_arg(ap, el_zfunc_t);
199 		void *arg = va_arg(ap, void *);
200 		rv = ch_resizefun(el, p, arg);
201 		break;
202 	}
203 
204 	case EL_ALIAS_TEXT: {
205 		el_afunc_t p = va_arg(ap, el_afunc_t);
206 		void *arg = va_arg(ap, void *);
207 		rv = ch_aliasfun(el, p, arg);
208 		break;
209 	}
210 
211 	case EL_PROMPT_ESC:
212 	case EL_RPROMPT_ESC: {
213 		el_pfunc_t p = va_arg(ap, el_pfunc_t);
214 		int c = va_arg(ap, int);
215 
216 		rv = prompt_set(el, p, (wchar_t)c, op, 1);
217 		break;
218 	}
219 
220 	case EL_TERMINAL:
221 		rv = terminal_set(el, va_arg(ap, char *));
222 		break;
223 
224 	case EL_EDITOR:
225 		rv = map_set_editor(el, va_arg(ap, wchar_t *));
226 		break;
227 
228 	case EL_SIGNAL:
229 		if (va_arg(ap, int))
230 			el->el_flags |= HANDLE_SIGNALS;
231 		else
232 			el->el_flags &= ~HANDLE_SIGNALS;
233 		break;
234 
235 	case EL_BIND:
236 	case EL_TELLTC:
237 	case EL_SETTC:
238 	case EL_ECHOTC:
239 	case EL_SETTY:
240 	{
241 		const wchar_t *argv[20];
242 		int i;
243 
244 		for (i = 1; i < (int)__arraycount(argv); i++)
245 			if ((argv[i] = va_arg(ap, wchar_t *)) == NULL)
246 				break;
247 
248 		switch (op) {
249 		case EL_BIND:
250 			argv[0] = L"bind";
251 			rv = map_bind(el, i, argv);
252 			break;
253 
254 		case EL_TELLTC:
255 			argv[0] = L"telltc";
256 			rv = terminal_telltc(el, i, argv);
257 			break;
258 
259 		case EL_SETTC:
260 			argv[0] = L"settc";
261 			rv = terminal_settc(el, i, argv);
262 			break;
263 
264 		case EL_ECHOTC:
265 			argv[0] = L"echotc";
266 			rv = terminal_echotc(el, i, argv);
267 			break;
268 
269 		case EL_SETTY:
270 			argv[0] = L"setty";
271 			rv = tty_stty(el, i, argv);
272 			break;
273 
274 		default:
275 			rv = -1;
276 			EL_ABORT((el->el_errfile, "Bad op %d\n", op));
277 			break;
278 		}
279 		break;
280 	}
281 
282 	case EL_ADDFN:
283 	{
284 		wchar_t *name = va_arg(ap, wchar_t *);
285 		wchar_t *help = va_arg(ap, wchar_t *);
286 		el_func_t func = va_arg(ap, el_func_t);
287 
288 		rv = map_addfunc(el, name, help, func);
289 		break;
290 	}
291 
292 	case EL_HIST:
293 	{
294 		hist_fun_t func = va_arg(ap, hist_fun_t);
295 		void *ptr = va_arg(ap, void *);
296 
297 		rv = hist_set(el, func, ptr);
298 		if (MB_CUR_MAX == 1)
299 			el->el_flags &= ~NARROW_HISTORY;
300 		break;
301 	}
302 
303 	case EL_EDITMODE:
304 		if (va_arg(ap, int))
305 			el->el_flags &= ~EDIT_DISABLED;
306 		else
307 			el->el_flags |= EDIT_DISABLED;
308 		rv = 0;
309 		break;
310 
311 	case EL_GETCFN:
312 	{
313 		el_rfunc_t rc = va_arg(ap, el_rfunc_t);
314 		rv = el_read_setfn(el->el_read, rc);
315 		break;
316 	}
317 
318 	case EL_CLIENTDATA:
319 		el->el_data = va_arg(ap, void *);
320 		break;
321 
322 	case EL_UNBUFFERED:
323 		rv = va_arg(ap, int);
324 		if (rv && !(el->el_flags & UNBUFFERED)) {
325 			el->el_flags |= UNBUFFERED;
326 			read_prepare(el);
327 		} else if (!rv && (el->el_flags & UNBUFFERED)) {
328 			el->el_flags &= ~UNBUFFERED;
329 			read_finish(el);
330 		}
331 		rv = 0;
332 		break;
333 
334 	case EL_PREP_TERM:
335 		rv = va_arg(ap, int);
336 		if (rv)
337 			(void) tty_rawmode(el);
338 		else
339 			(void) tty_cookedmode(el);
340 		rv = 0;
341 		break;
342 
343 	case EL_SETFP:
344 	{
345 		FILE *fp;
346 		int what;
347 
348 		what = va_arg(ap, int);
349 		fp = va_arg(ap, FILE *);
350 
351 		rv = 0;
352 		switch (what) {
353 		case 0:
354 			el->el_infile = fp;
355 			el->el_infd = fileno(fp);
356 			break;
357 		case 1:
358 			el->el_outfile = fp;
359 			el->el_outfd = fileno(fp);
360 			break;
361 		case 2:
362 			el->el_errfile = fp;
363 			el->el_errfd = fileno(fp);
364 			break;
365 		default:
366 			rv = -1;
367 			break;
368 		}
369 		break;
370 	}
371 
372 	case EL_REFRESH:
373 		re_clear_display(el);
374 		re_refresh(el);
375 		terminal__flush(el);
376 		break;
377 
378 	default:
379 		rv = -1;
380 		break;
381 	}
382 
383 	va_end(ap);
384 	return rv;
385 }
386 
387 
388 /* el_get():
389  *	retrieve the editline parameters
390  */
391 int
392 el_wget(EditLine *el, int op, ...)
393 {
394 	va_list ap;
395 	int rv;
396 
397 	if (el == NULL)
398 		return -1;
399 
400 	va_start(ap, op);
401 
402 	switch (op) {
403 	case EL_PROMPT:
404 	case EL_RPROMPT: {
405 		el_pfunc_t *p = va_arg(ap, el_pfunc_t *);
406 		rv = prompt_get(el, p, 0, op);
407 		break;
408 	}
409 	case EL_PROMPT_ESC:
410 	case EL_RPROMPT_ESC: {
411 		el_pfunc_t *p = va_arg(ap, el_pfunc_t *);
412 		wchar_t *c = va_arg(ap, wchar_t *);
413 
414 		rv = prompt_get(el, p, c, op);
415 		break;
416 	}
417 
418 	case EL_EDITOR:
419 		rv = map_get_editor(el, va_arg(ap, const wchar_t **));
420 		break;
421 
422 	case EL_SIGNAL:
423 		*va_arg(ap, int *) = (el->el_flags & HANDLE_SIGNALS);
424 		rv = 0;
425 		break;
426 
427 	case EL_EDITMODE:
428 		*va_arg(ap, int *) = !(el->el_flags & EDIT_DISABLED);
429 		rv = 0;
430 		break;
431 
432 	case EL_TERMINAL:
433 		terminal_get(el, va_arg(ap, const char **));
434 		rv = 0;
435 		break;
436 
437 	case EL_GETTC:
438 	{
439 		static char name[] = "gettc";
440 		char *argv[3];
441 		argv[0] = name;
442 		argv[1] = va_arg(ap, char *);
443 		argv[2] = va_arg(ap, void *);
444 		rv = terminal_gettc(el, 3, argv);
445 		break;
446 	}
447 
448 	case EL_GETCFN:
449 		*va_arg(ap, el_rfunc_t *) = el_read_getfn(el->el_read);
450 		rv = 0;
451 		break;
452 
453 	case EL_CLIENTDATA:
454 		*va_arg(ap, void **) = el->el_data;
455 		rv = 0;
456 		break;
457 
458 	case EL_UNBUFFERED:
459 		*va_arg(ap, int *) = (el->el_flags & UNBUFFERED) != 0;
460 		rv = 0;
461 		break;
462 
463 	case EL_GETFP:
464 	{
465 		int what;
466 		FILE **fpp;
467 
468 		what = va_arg(ap, int);
469 		fpp = va_arg(ap, FILE **);
470 		rv = 0;
471 		switch (what) {
472 		case 0:
473 			*fpp = el->el_infile;
474 			break;
475 		case 1:
476 			*fpp = el->el_outfile;
477 			break;
478 		case 2:
479 			*fpp = el->el_errfile;
480 			break;
481 		default:
482 			rv = -1;
483 			break;
484 		}
485 		break;
486 	}
487 	default:
488 		rv = -1;
489 		break;
490 	}
491 	va_end(ap);
492 
493 	return rv;
494 }
495 
496 
497 /* el_line():
498  *	Return editing info
499  */
500 const LineInfoW *
501 el_wline(EditLine *el)
502 {
503 
504 	return (const LineInfoW *)(void *)&el->el_line;
505 }
506 
507 
508 /* el_source():
509  *	Source a file
510  */
511 int
512 el_source(EditLine *el, const char *fname)
513 {
514 	FILE *fp;
515 	size_t len;
516 	ssize_t slen;
517 	char *ptr;
518 	char *path = NULL;
519 	const wchar_t *dptr;
520 	int error = 0;
521 
522 	fp = NULL;
523 	if (fname == NULL) {
524 #ifdef HAVE_ISSETUGID
525 		if (issetugid())
526 			return -1;
527 
528 		if ((fname = getenv("EDITRC")) == NULL) {
529 			static const char elpath[] = "/.editrc";
530 			size_t plen = sizeof(elpath);
531 
532 			if ((ptr = getenv("HOME")) == NULL)
533 				return -1;
534 			plen += strlen(ptr);
535 			if ((path = el_calloc(plen, sizeof(*path))) == NULL)
536 				return -1;
537 			(void)snprintf(path, plen, "%s%s", ptr,
538 				elpath + (*ptr == '\0'));
539 			fname = path;
540 		}
541 #else
542 		/*
543 		 * If issetugid() is missing, always return an error, in order
544 		 * to keep from inadvertently opening up the user to a security
545 		 * hole.
546 		 */
547 		return -1;
548 #endif
549 	}
550 	if (fname[0] == '\0')
551 		return -1;
552 
553 	if (fp == NULL)
554 		fp = fopen(fname, "r");
555 	if (fp == NULL) {
556 		el_free(path);
557 		return -1;
558 	}
559 
560 	ptr = NULL;
561 	len = 0;
562 	while ((slen = getline(&ptr, &len, fp)) != -1) {
563 		if (*ptr == '\n')
564 			continue;	/* Empty line. */
565 		if (slen > 0 && ptr[--slen] == '\n')
566 			ptr[slen] = '\0';
567 
568 		dptr = ct_decode_string(ptr, &el->el_scratch);
569 		if (!dptr)
570 			continue;
571 		/* loop until first non-space char or EOL */
572 		while (*dptr != '\0' && iswspace(*dptr))
573 			dptr++;
574 		if (*dptr == '#')
575 			continue;   /* ignore, this is a comment line */
576 		if ((error = parse_line(el, dptr)) == -1)
577 			break;
578 	}
579 	free(ptr);
580 
581 	el_free(path);
582 	(void) fclose(fp);
583 	return error;
584 }
585 
586 
587 /* el_resize():
588  *	Called from program when terminal is resized
589  */
590 void
591 el_resize(EditLine *el)
592 {
593 	int lins, cols;
594 	sigset_t oset, nset;
595 
596 	(void) sigemptyset(&nset);
597 	(void) sigaddset(&nset, SIGWINCH);
598 	(void) sigprocmask(SIG_BLOCK, &nset, &oset);
599 
600 	/* get the correct window size */
601 	if (terminal_get_size(el, &lins, &cols))
602 		terminal_change_size(el, lins, cols);
603 
604 	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
605 }
606 
607 
608 /* el_beep():
609  *	Called from the program to beep
610  */
611 void
612 el_beep(EditLine *el)
613 {
614 
615 	terminal_beep(el);
616 }
617 
618 
619 /* el_editmode()
620  *	Set the state of EDIT_DISABLED from the `edit' command.
621  */
622 libedit_private int
623 /*ARGSUSED*/
624 el_editmode(EditLine *el, int argc, const wchar_t **argv)
625 {
626 	const wchar_t *how;
627 
628 	if (argv == NULL || argc != 2 || argv[1] == NULL)
629 		return -1;
630 
631 	how = argv[1];
632 	if (wcscmp(how, L"on") == 0) {
633 		el->el_flags &= ~EDIT_DISABLED;
634 		tty_rawmode(el);
635 	} else if (wcscmp(how, L"off") == 0) {
636 		tty_cookedmode(el);
637 		el->el_flags |= EDIT_DISABLED;
638 	}
639 	else {
640 		(void) fprintf(el->el_errfile, "edit: Bad value `%ls'.\n",
641 		    how);
642 		return -1;
643 	}
644 	return 0;
645 }
646