xref: /freebsd/contrib/libedit/readline.c (revision cfd6422a5217410fbd66f7a7a8a64d9d85e61229)
1 /*	$NetBSD: readline.c,v 1.157 2019/08/21 11:11:48 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jaromir Dolecek.
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  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include "config.h"
33 #if !defined(lint) && !defined(SCCSID)
34 __RCSID("$NetBSD: readline.c,v 1.157 2019/08/21 11:11:48 christos Exp $");
35 #endif /* not lint && not SCCSID */
36 
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <ctype.h>
40 #include <dirent.h>
41 #include <errno.h>
42 #include <fcntl.h>
43 #include <limits.h>
44 #include <pwd.h>
45 #include <setjmp.h>
46 #include <stdint.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <unistd.h>
51 #include <vis.h>
52 
53 #include "readline/readline.h"
54 #include "el.h"
55 #include "fcns.h"
56 #include "filecomplete.h"
57 
58 void rl_prep_terminal(int);
59 void rl_deprep_terminal(void);
60 
61 /* for rl_complete() */
62 #define TAB		'\r'
63 
64 /* see comment at the #ifdef for sense of this */
65 /* #define GDB_411_HACK */
66 
67 /* readline compatibility stuff - look at readline sources/documentation */
68 /* to see what these variables mean */
69 const char *rl_library_version = "EditLine wrapper";
70 int rl_readline_version = RL_READLINE_VERSION;
71 static char empty[] = { '\0' };
72 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
73 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
74     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
75 const char *rl_readline_name = empty;
76 FILE *rl_instream = NULL;
77 FILE *rl_outstream = NULL;
78 int rl_point = 0;
79 int rl_end = 0;
80 char *rl_line_buffer = NULL;
81 rl_vcpfunc_t *rl_linefunc = NULL;
82 int rl_done = 0;
83 rl_hook_func_t *rl_event_hook = NULL;
84 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
85     emacs_meta_keymap,
86     emacs_ctlx_keymap;
87 /*
88  * The following is not implemented; we always catch signals in the
89  * libedit fashion: set handlers on entry to el_gets() and clear them
90  * on the way out. This simplistic approach works for most cases; if
91  * it does not work for your application, please let us know.
92  */
93 int rl_catch_signals = 1;
94 int rl_catch_sigwinch = 1;
95 
96 int history_base = 1;		/* probably never subject to change */
97 int history_length = 0;
98 int history_offset = 0;
99 int max_input_history = 0;
100 char history_expansion_char = '!';
101 char history_subst_char = '^';
102 char *history_no_expand_chars = expand_chars;
103 Function *history_inhibit_expansion_function = NULL;
104 char *history_arg_extract(int start, int end, const char *str);
105 
106 int rl_inhibit_completion = 0;
107 int rl_attempted_completion_over = 0;
108 const char *rl_basic_word_break_characters = break_chars;
109 char *rl_completer_word_break_characters = NULL;
110 const char *rl_completer_quote_characters = NULL;
111 rl_compentry_func_t *rl_completion_entry_function = NULL;
112 char *(*rl_completion_word_break_hook)(void) = NULL;
113 rl_completion_func_t *rl_attempted_completion_function = NULL;
114 Function *rl_pre_input_hook = NULL;
115 Function *rl_startup1_hook = NULL;
116 int (*rl_getc_function)(FILE *) = NULL;
117 char *rl_terminal_name = NULL;
118 int rl_already_prompted = 0;
119 int rl_filename_completion_desired = 0;
120 int rl_ignore_completion_duplicates = 0;
121 int readline_echoing_p = 1;
122 int _rl_print_completions_horizontally = 0;
123 VFunction *rl_redisplay_function = NULL;
124 Function *rl_startup_hook = NULL;
125 int rl_did_startup_hook = 0;
126 VFunction *rl_completion_display_matches_hook = NULL;
127 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
128 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
129 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
130 
131 /*
132  * The current prompt string.
133  */
134 char *rl_prompt = NULL;
135 /*
136  * This is set to character indicating type of completion being done by
137  * rl_complete_internal(); this is available for application completion
138  * functions.
139  */
140 int rl_completion_type = 0;
141 
142 /*
143  * If more than this number of items results from query for possible
144  * completions, we ask user if they are sure to really display the list.
145  */
146 int rl_completion_query_items = 100;
147 
148 /*
149  * List of characters which are word break characters, but should be left
150  * in the parsed text when it is passed to the completion function.
151  * Shell uses this to help determine what kind of completing to do.
152  */
153 const char *rl_special_prefixes = NULL;
154 
155 /*
156  * This is the character appended to the completed words if at the end of
157  * the line. Default is ' ' (a space).
158  */
159 int rl_completion_append_character = ' ';
160 
161 /* stuff below is used internally by libedit for readline emulation */
162 
163 static History *h = NULL;
164 static EditLine *e = NULL;
165 static rl_command_func_t *map[256];
166 static jmp_buf topbuf;
167 
168 /* internal functions */
169 static unsigned char	 _el_rl_complete(EditLine *, int);
170 static unsigned char	 _el_rl_tstp(EditLine *, int);
171 static char		*_get_prompt(EditLine *);
172 static int		 _getc_function(EditLine *, wchar_t *);
173 static int		 _history_expand_command(const char *, size_t, size_t,
174     char **);
175 static char		*_rl_compat_sub(const char *, const char *,
176     const char *, int);
177 static int		 _rl_event_read_char(EditLine *, wchar_t *);
178 static void		 _rl_update_pos(void);
179 
180 static HIST_ENTRY rl_he;
181 
182 /* ARGSUSED */
183 static char *
184 _get_prompt(EditLine *el __attribute__((__unused__)))
185 {
186 	rl_already_prompted = 1;
187 	return rl_prompt;
188 }
189 
190 
191 /*
192  * read one key from user defined input function
193  */
194 static int
195 /*ARGSUSED*/
196 _getc_function(EditLine *el __attribute__((__unused__)), wchar_t *c)
197 {
198 	int i;
199 
200 	i = (*rl_getc_function)(rl_instream);
201 	if (i == -1)
202 		return 0;
203 	*c = (wchar_t)i;
204 	return 1;
205 }
206 
207 static void
208 _resize_fun(EditLine *el, void *a)
209 {
210 	const LineInfo *li;
211 	char **ap = a;
212 
213 	li = el_line(el);
214 	/* a cheesy way to get rid of const cast. */
215 	*ap = memchr(li->buffer, *li->buffer, (size_t)1);
216 }
217 
218 static const char *
219 _default_history_file(void)
220 {
221 	struct passwd *p;
222 	static char *path;
223 	size_t len;
224 
225 	if (path)
226 		return path;
227 
228 	if ((p = getpwuid(getuid())) == NULL)
229 		return NULL;
230 
231 	len = strlen(p->pw_dir) + sizeof("/.history");
232 	if ((path = malloc(len)) == NULL)
233 		return NULL;
234 
235 	(void)snprintf(path, len, "%s/.history", p->pw_dir);
236 	return path;
237 }
238 
239 /*
240  * READLINE compatibility stuff
241  */
242 
243 /*
244  * Set the prompt
245  */
246 int
247 rl_set_prompt(const char *prompt)
248 {
249 	char *p;
250 
251 	if (!prompt)
252 		prompt = "";
253 	if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
254 		return 0;
255 	if (rl_prompt)
256 		el_free(rl_prompt);
257 	rl_prompt = strdup(prompt);
258 	if (rl_prompt == NULL)
259 		return -1;
260 
261 	while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL) {
262 		/* Remove adjacent end/start markers to avoid double-escapes. */
263 		if (p[1] == RL_PROMPT_START_IGNORE) {
264 			memmove(p, p + 2, 1 + strlen(p + 2));
265 		} else {
266 			*p = RL_PROMPT_START_IGNORE;
267 		}
268 	}
269 
270 	return 0;
271 }
272 
273 /*
274  * initialize rl compat stuff
275  */
276 int
277 rl_initialize(void)
278 {
279 	HistEvent ev;
280 	int editmode = 1;
281 	struct termios t;
282 
283 	if (e != NULL)
284 		el_end(e);
285 	if (h != NULL)
286 		history_end(h);
287 
288 	if (!rl_instream)
289 		rl_instream = stdin;
290 	if (!rl_outstream)
291 		rl_outstream = stdout;
292 
293 	/*
294 	 * See if we don't really want to run the editor
295 	 */
296 	if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
297 		editmode = 0;
298 
299 	e = el_init_internal(rl_readline_name, rl_instream, rl_outstream,
300 	    stderr, fileno(rl_instream), fileno(rl_outstream), fileno(stderr),
301 	    NO_RESET);
302 
303 	if (!editmode)
304 		el_set(e, EL_EDITMODE, 0);
305 
306 	h = history_init();
307 	if (!e || !h)
308 		return -1;
309 
310 	history(h, &ev, H_SETSIZE, INT_MAX);	/* unlimited */
311 	history_length = 0;
312 	max_input_history = INT_MAX;
313 	el_set(e, EL_HIST, history, h);
314 
315 	/* Setup resize function */
316 	el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
317 
318 	/* setup getc function if valid */
319 	if (rl_getc_function)
320 		el_set(e, EL_GETCFN, _getc_function);
321 
322 	/* for proper prompt printing in readline() */
323 	if (rl_set_prompt("") == -1) {
324 		history_end(h);
325 		el_end(e);
326 		return -1;
327 	}
328 	el_set(e, EL_PROMPT_ESC, _get_prompt, RL_PROMPT_START_IGNORE);
329 	el_set(e, EL_SIGNAL, rl_catch_signals);
330 
331 	/* set default mode to "emacs"-style and read setting afterwards */
332 	/* so this can be overridden */
333 	el_set(e, EL_EDITOR, "emacs");
334 	if (rl_terminal_name != NULL)
335 		el_set(e, EL_TERMINAL, rl_terminal_name);
336 	else
337 		el_get(e, EL_TERMINAL, &rl_terminal_name);
338 
339 	/*
340 	 * Word completion - this has to go AFTER rebinding keys
341 	 * to emacs-style.
342 	 */
343 	el_set(e, EL_ADDFN, "rl_complete",
344 	    "ReadLine compatible completion function",
345 	    _el_rl_complete);
346 	el_set(e, EL_BIND, "^I", "rl_complete", NULL);
347 
348 	/*
349 	 * Send TSTP when ^Z is pressed.
350 	 */
351 	el_set(e, EL_ADDFN, "rl_tstp",
352 	    "ReadLine compatible suspend function",
353 	    _el_rl_tstp);
354 	el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
355 
356 	/*
357 	 * Set some readline compatible key-bindings.
358 	 */
359 	el_set(e, EL_BIND, "^R", "em-inc-search-prev", NULL);
360 
361 	/*
362 	 * Allow the use of Home/End keys.
363 	 */
364 	el_set(e, EL_BIND, "\\e[1~", "ed-move-to-beg", NULL);
365 	el_set(e, EL_BIND, "\\e[4~", "ed-move-to-end", NULL);
366 	el_set(e, EL_BIND, "\\e[7~", "ed-move-to-beg", NULL);
367 	el_set(e, EL_BIND, "\\e[8~", "ed-move-to-end", NULL);
368 	el_set(e, EL_BIND, "\\e[H", "ed-move-to-beg", NULL);
369 	el_set(e, EL_BIND, "\\e[F", "ed-move-to-end", NULL);
370 
371 	/*
372 	 * Allow the use of the Delete/Insert keys.
373 	 */
374 	el_set(e, EL_BIND, "\\e[3~", "ed-delete-next-char", NULL);
375 	el_set(e, EL_BIND, "\\e[2~", "ed-quoted-insert", NULL);
376 
377 	/*
378 	 * Ctrl-left-arrow and Ctrl-right-arrow for word moving.
379 	 */
380 	el_set(e, EL_BIND, "\\e[1;5C", "em-next-word", NULL);
381 	el_set(e, EL_BIND, "\\e[1;5D", "ed-prev-word", NULL);
382 	el_set(e, EL_BIND, "\\e[5C", "em-next-word", NULL);
383 	el_set(e, EL_BIND, "\\e[5D", "ed-prev-word", NULL);
384 	el_set(e, EL_BIND, "\\e\\e[C", "em-next-word", NULL);
385 	el_set(e, EL_BIND, "\\e\\e[D", "ed-prev-word", NULL);
386 
387 	/* read settings from configuration file */
388 	el_source(e, NULL);
389 
390 	/*
391 	 * Unfortunately, some applications really do use rl_point
392 	 * and rl_line_buffer directly.
393 	 */
394 	_resize_fun(e, &rl_line_buffer);
395 	_rl_update_pos();
396 
397 	tty_end(e, TCSADRAIN);
398 
399 	return 0;
400 }
401 
402 
403 /*
404  * read one line from input stream and return it, chomping
405  * trailing newline (if there is any)
406  */
407 char *
408 readline(const char *p)
409 {
410 	HistEvent ev;
411 	const char * volatile prompt = p;
412 	int count;
413 	const char *ret;
414 	char *buf;
415 	static int used_event_hook;
416 
417 	if (e == NULL || h == NULL)
418 		rl_initialize();
419 	if (rl_did_startup_hook == 0 && rl_startup_hook) {
420 		rl_did_startup_hook = 1;
421 		(*rl_startup_hook)(NULL, 0);
422 	}
423 	tty_init(e);
424 
425 
426 	rl_done = 0;
427 
428 	(void)setjmp(topbuf);
429 	buf = NULL;
430 
431 	/* update prompt accordingly to what has been passed */
432 	if (rl_set_prompt(prompt) == -1)
433 		goto out;
434 
435 	if (rl_pre_input_hook)
436 		(*rl_pre_input_hook)(NULL, 0);
437 
438 	if (rl_event_hook && !(e->el_flags & NO_TTY)) {
439 		el_set(e, EL_GETCFN, _rl_event_read_char);
440 		used_event_hook = 1;
441 	}
442 
443 	if (!rl_event_hook && used_event_hook) {
444 		el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
445 		used_event_hook = 0;
446 	}
447 
448 	rl_already_prompted = 0;
449 
450 	/* get one line from input stream */
451 	ret = el_gets(e, &count);
452 
453 	if (ret && count > 0) {
454 		int lastidx;
455 
456 		buf = strdup(ret);
457 		if (buf == NULL)
458 			goto out;
459 		lastidx = count - 1;
460 		if (buf[lastidx] == '\n')
461 			buf[lastidx] = '\0';
462 	} else
463 		buf = NULL;
464 
465 	history(h, &ev, H_GETSIZE);
466 	history_length = ev.num;
467 
468 out:
469 	tty_end(e, TCSADRAIN);
470 	return buf;
471 }
472 
473 /*
474  * history functions
475  */
476 
477 /*
478  * is normally called before application starts to use
479  * history expansion functions
480  */
481 void
482 using_history(void)
483 {
484 	if (h == NULL || e == NULL)
485 		rl_initialize();
486 	history_offset = history_length;
487 }
488 
489 
490 /*
491  * substitute ``what'' with ``with'', returning resulting string; if
492  * globally == 1, substitutes all occurrences of what, otherwise only the
493  * first one
494  */
495 static char *
496 _rl_compat_sub(const char *str, const char *what, const char *with,
497     int globally)
498 {
499 	const	char	*s;
500 	char	*r, *result;
501 	size_t	len, with_len, what_len;
502 
503 	len = strlen(str);
504 	with_len = strlen(with);
505 	what_len = strlen(what);
506 
507 	/* calculate length we need for result */
508 	s = str;
509 	while (*s) {
510 		if (*s == *what && !strncmp(s, what, what_len)) {
511 			len += with_len - what_len;
512 			if (!globally)
513 				break;
514 			s += what_len;
515 		} else
516 			s++;
517 	}
518 	r = result = el_calloc(len + 1, sizeof(*r));
519 	if (result == NULL)
520 		return NULL;
521 	s = str;
522 	while (*s) {
523 		if (*s == *what && !strncmp(s, what, what_len)) {
524 			(void)strncpy(r, with, with_len);
525 			r += with_len;
526 			s += what_len;
527 			if (!globally) {
528 				(void)strcpy(r, s);
529 				return result;
530 			}
531 		} else
532 			*r++ = *s++;
533 	}
534 	*r = '\0';
535 	return result;
536 }
537 
538 static	char	*last_search_pat;	/* last !?pat[?] search pattern */
539 static	char	*last_search_match;	/* last !?pat[?] that matched */
540 
541 const char *
542 get_history_event(const char *cmd, int *cindex, int qchar)
543 {
544 	int idx, sign, sub, num, begin, ret;
545 	size_t len;
546 	char	*pat;
547 	const char *rptr;
548 	HistEvent ev;
549 
550 	idx = *cindex;
551 	if (cmd[idx++] != history_expansion_char)
552 		return NULL;
553 
554 	/* find out which event to take */
555 	if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
556 		if (history(h, &ev, H_FIRST) != 0)
557 			return NULL;
558 		*cindex = cmd[idx]? (idx + 1):idx;
559 		return ev.str;
560 	}
561 	sign = 0;
562 	if (cmd[idx] == '-') {
563 		sign = 1;
564 		idx++;
565 	}
566 
567 	if ('0' <= cmd[idx] && cmd[idx] <= '9') {
568 		HIST_ENTRY *he;
569 
570 		num = 0;
571 		while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
572 			num = num * 10 + cmd[idx] - '0';
573 			idx++;
574 		}
575 		if (sign)
576 			num = history_length - num + history_base;
577 
578 		if (!(he = history_get(num)))
579 			return NULL;
580 
581 		*cindex = idx;
582 		return he->line;
583 	}
584 	sub = 0;
585 	if (cmd[idx] == '?') {
586 		sub = 1;
587 		idx++;
588 	}
589 	begin = idx;
590 	while (cmd[idx]) {
591 		if (cmd[idx] == '\n')
592 			break;
593 		if (sub && cmd[idx] == '?')
594 			break;
595 		if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
596 				    || cmd[idx] == '\t' || cmd[idx] == qchar))
597 			break;
598 		idx++;
599 	}
600 	len = (size_t)idx - (size_t)begin;
601 	if (sub && cmd[idx] == '?')
602 		idx++;
603 	if (sub && len == 0 && last_search_pat && *last_search_pat)
604 		pat = last_search_pat;
605 	else if (len == 0)
606 		return NULL;
607 	else {
608 		if ((pat = el_calloc(len + 1, sizeof(*pat))) == NULL)
609 			return NULL;
610 		(void)strncpy(pat, cmd + begin, len);
611 		pat[len] = '\0';
612 	}
613 
614 	if (history(h, &ev, H_CURR) != 0) {
615 		if (pat != last_search_pat)
616 			el_free(pat);
617 		return NULL;
618 	}
619 	num = ev.num;
620 
621 	if (sub) {
622 		if (pat != last_search_pat) {
623 			if (last_search_pat)
624 				el_free(last_search_pat);
625 			last_search_pat = pat;
626 		}
627 		ret = history_search(pat, -1);
628 	} else
629 		ret = history_search_prefix(pat, -1);
630 
631 	if (ret == -1) {
632 		/* restore to end of list on failed search */
633 		history(h, &ev, H_FIRST);
634 		(void)fprintf(rl_outstream, "%s: Event not found\n", pat);
635 		if (pat != last_search_pat)
636 			el_free(pat);
637 		return NULL;
638 	}
639 
640 	if (sub && len) {
641 		if (last_search_match && last_search_match != pat)
642 			el_free(last_search_match);
643 		last_search_match = pat;
644 	}
645 
646 	if (pat != last_search_pat)
647 		el_free(pat);
648 
649 	if (history(h, &ev, H_CURR) != 0)
650 		return NULL;
651 	*cindex = idx;
652 	rptr = ev.str;
653 
654 	/* roll back to original position */
655 	(void)history(h, &ev, H_SET, num);
656 
657 	return rptr;
658 }
659 
660 /*
661  * the real function doing history expansion - takes as argument command
662  * to do and data upon which the command should be executed
663  * does expansion the way I've understood readline documentation
664  *
665  * returns 0 if data was not modified, 1 if it was and 2 if the string
666  * should be only printed and not executed; in case of error,
667  * returns -1 and *result points to NULL
668  * it's the caller's responsibility to free() the string returned in *result
669  */
670 static int
671 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
672     char **result)
673 {
674 	char *tmp, *search = NULL, *aptr;
675 	const char *ptr, *cmd;
676 	static char *from = NULL, *to = NULL;
677 	int start, end, idx, has_mods = 0;
678 	int p_on = 0, g_on = 0;
679 
680 	*result = NULL;
681 	aptr = NULL;
682 	ptr = NULL;
683 
684 	/* First get event specifier */
685 	idx = 0;
686 
687 	if (strchr(":^*$", command[offs + 1])) {
688 		char str[4];
689 		/*
690 		* "!:" is shorthand for "!!:".
691 		* "!^", "!*" and "!$" are shorthand for
692 		* "!!:^", "!!:*" and "!!:$" respectively.
693 		*/
694 		str[0] = str[1] = '!';
695 		str[2] = '0';
696 		ptr = get_history_event(str, &idx, 0);
697 		idx = (command[offs + 1] == ':')? 1:0;
698 		has_mods = 1;
699 	} else {
700 		if (command[offs + 1] == '#') {
701 			/* use command so far */
702 			if ((aptr = el_calloc(offs + 1, sizeof(*aptr)))
703 			    == NULL)
704 				return -1;
705 			(void)strncpy(aptr, command, offs);
706 			aptr[offs] = '\0';
707 			idx = 1;
708 		} else {
709 			int	qchar;
710 
711 			qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
712 			ptr = get_history_event(command + offs, &idx, qchar);
713 		}
714 		has_mods = command[offs + (size_t)idx] == ':';
715 	}
716 
717 	if (ptr == NULL && aptr == NULL)
718 		return -1;
719 
720 	if (!has_mods) {
721 		*result = strdup(aptr ? aptr : ptr);
722 		if (aptr)
723 			el_free(aptr);
724 		if (*result == NULL)
725 			return -1;
726 		return 1;
727 	}
728 
729 	cmd = command + offs + idx + 1;
730 
731 	/* Now parse any word designators */
732 
733 	if (*cmd == '%')	/* last word matched by ?pat? */
734 		tmp = strdup(last_search_match? last_search_match:"");
735 	else if (strchr("^*$-0123456789", *cmd)) {
736 		start = end = -1;
737 		if (*cmd == '^')
738 			start = end = 1, cmd++;
739 		else if (*cmd == '$')
740 			start = -1, cmd++;
741 		else if (*cmd == '*')
742 			start = 1, cmd++;
743 	       else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
744 			start = 0;
745 			while (*cmd && '0' <= *cmd && *cmd <= '9')
746 				start = start * 10 + *cmd++ - '0';
747 
748 			if (*cmd == '-') {
749 				if (isdigit((unsigned char) cmd[1])) {
750 					cmd++;
751 					end = 0;
752 					while (*cmd && '0' <= *cmd && *cmd <= '9')
753 						end = end * 10 + *cmd++ - '0';
754 				} else if (cmd[1] == '$') {
755 					cmd += 2;
756 					end = -1;
757 				} else {
758 					cmd++;
759 					end = -2;
760 				}
761 			} else if (*cmd == '*')
762 				end = -1, cmd++;
763 			else
764 				end = start;
765 		}
766 		tmp = history_arg_extract(start, end, aptr? aptr:ptr);
767 		if (tmp == NULL) {
768 			(void)fprintf(rl_outstream, "%s: Bad word specifier",
769 			    command + offs + idx);
770 			if (aptr)
771 				el_free(aptr);
772 			return -1;
773 		}
774 	} else
775 		tmp = strdup(aptr? aptr:ptr);
776 
777 	if (aptr)
778 		el_free(aptr);
779 
780 	if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
781 		*result = tmp;
782 		return 1;
783 	}
784 
785 	for (; *cmd; cmd++) {
786 		if (*cmd == ':')
787 			continue;
788 		else if (*cmd == 'h') {		/* remove trailing path */
789 			if ((aptr = strrchr(tmp, '/')) != NULL)
790 				*aptr = '\0';
791 		} else if (*cmd == 't') {	/* remove leading path */
792 			if ((aptr = strrchr(tmp, '/')) != NULL) {
793 				aptr = strdup(aptr + 1);
794 				el_free(tmp);
795 				tmp = aptr;
796 			}
797 		} else if (*cmd == 'r') {	/* remove trailing suffix */
798 			if ((aptr = strrchr(tmp, '.')) != NULL)
799 				*aptr = '\0';
800 		} else if (*cmd == 'e') {	/* remove all but suffix */
801 			if ((aptr = strrchr(tmp, '.')) != NULL) {
802 				aptr = strdup(aptr);
803 				el_free(tmp);
804 				tmp = aptr;
805 			}
806 		} else if (*cmd == 'p')		/* print only */
807 			p_on = 1;
808 		else if (*cmd == 'g')
809 			g_on = 2;
810 		else if (*cmd == 's' || *cmd == '&') {
811 			char *what, *with, delim;
812 			size_t len, from_len;
813 			size_t size;
814 
815 			if (*cmd == '&' && (from == NULL || to == NULL))
816 				continue;
817 			else if (*cmd == 's') {
818 				delim = *(++cmd), cmd++;
819 				size = 16;
820 				what = el_realloc(from, size * sizeof(*what));
821 				if (what == NULL) {
822 					el_free(from);
823 					el_free(tmp);
824 					return 0;
825 				}
826 				len = 0;
827 				for (; *cmd && *cmd != delim; cmd++) {
828 					if (*cmd == '\\' && cmd[1] == delim)
829 						cmd++;
830 					if (len >= size) {
831 						char *nwhat;
832 						nwhat = el_realloc(what,
833 						    (size <<= 1) *
834 						    sizeof(*nwhat));
835 						if (nwhat == NULL) {
836 							el_free(what);
837 							el_free(tmp);
838 							return 0;
839 						}
840 						what = nwhat;
841 					}
842 					what[len++] = *cmd;
843 				}
844 				what[len] = '\0';
845 				from = what;
846 				if (*what == '\0') {
847 					el_free(what);
848 					if (search) {
849 						from = strdup(search);
850 						if (from == NULL) {
851 							el_free(tmp);
852 							return 0;
853 						}
854 					} else {
855 						from = NULL;
856 						el_free(tmp);
857 						return -1;
858 					}
859 				}
860 				cmd++;	/* shift after delim */
861 				if (!*cmd)
862 					continue;
863 
864 				size = 16;
865 				with = el_realloc(to, size * sizeof(*with));
866 				if (with == NULL) {
867 					el_free(to);
868 					el_free(tmp);
869 					return -1;
870 				}
871 				len = 0;
872 				from_len = strlen(from);
873 				for (; *cmd && *cmd != delim; cmd++) {
874 					if (len + from_len + 1 >= size) {
875 						char *nwith;
876 						size += from_len + 1;
877 						nwith = el_realloc(with,
878 						    size * sizeof(*nwith));
879 						if (nwith == NULL) {
880 							el_free(with);
881 							el_free(tmp);
882 							return -1;
883 						}
884 						with = nwith;
885 					}
886 					if (*cmd == '&') {
887 						/* safe */
888 						(void)strcpy(&with[len], from);
889 						len += from_len;
890 						continue;
891 					}
892 					if (*cmd == '\\'
893 					    && (*(cmd + 1) == delim
894 						|| *(cmd + 1) == '&'))
895 						cmd++;
896 					with[len++] = *cmd;
897 				}
898 				with[len] = '\0';
899 				to = with;
900 			}
901 
902 			aptr = _rl_compat_sub(tmp, from, to, g_on);
903 			if (aptr) {
904 				el_free(tmp);
905 				tmp = aptr;
906 			}
907 			g_on = 0;
908 		}
909 	}
910 	*result = tmp;
911 	return p_on? 2:1;
912 }
913 
914 
915 /*
916  * csh-style history expansion
917  */
918 int
919 history_expand(char *str, char **output)
920 {
921 	int ret = 0;
922 	size_t idx, i, size;
923 	char *tmp, *result;
924 
925 	if (h == NULL || e == NULL)
926 		rl_initialize();
927 
928 	if (history_expansion_char == 0) {
929 		*output = strdup(str);
930 		return 0;
931 	}
932 
933 	*output = NULL;
934 	if (str[0] == history_subst_char) {
935 		/* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
936 		*output = el_calloc(strlen(str) + 4 + 1, sizeof(**output));
937 		if (*output == NULL)
938 			return 0;
939 		(*output)[0] = (*output)[1] = history_expansion_char;
940 		(*output)[2] = ':';
941 		(*output)[3] = 's';
942 		(void)strcpy((*output) + 4, str);
943 		str = *output;
944 	} else {
945 		*output = strdup(str);
946 		if (*output == NULL)
947 			return 0;
948 	}
949 
950 #define ADD_STRING(what, len, fr)					\
951 	{								\
952 		if (idx + len + 1 > size) {				\
953 			char *nresult = el_realloc(result,		\
954 			    (size += len + 1) * sizeof(*nresult));	\
955 			if (nresult == NULL) {				\
956 				el_free(*output);			\
957 				if (/*CONSTCOND*/fr)			\
958 					el_free(tmp);			\
959 				return 0;				\
960 			}						\
961 			result = nresult;				\
962 		}							\
963 		(void)strncpy(&result[idx], what, len);			\
964 		idx += len;						\
965 		result[idx] = '\0';					\
966 	}
967 
968 	result = NULL;
969 	size = idx = 0;
970 	tmp = NULL;
971 	for (i = 0; str[i];) {
972 		int qchar, loop_again;
973 		size_t len, start, j;
974 
975 		qchar = 0;
976 		loop_again = 1;
977 		start = j = i;
978 loop:
979 		for (; str[j]; j++) {
980 			if (str[j] == '\\' &&
981 			    str[j + 1] == history_expansion_char) {
982 				len = strlen(&str[j + 1]) + 1;
983 				memmove(&str[j], &str[j + 1], len);
984 				continue;
985 			}
986 			if (!loop_again) {
987 				if (isspace((unsigned char) str[j])
988 				    || str[j] == qchar)
989 					break;
990 			}
991 			if (str[j] == history_expansion_char
992 			    && !strchr(history_no_expand_chars, str[j + 1])
993 			    && (!history_inhibit_expansion_function ||
994 			    (*history_inhibit_expansion_function)(str,
995 			    (int)j) == 0))
996 				break;
997 		}
998 
999 		if (str[j] && loop_again) {
1000 			i = j;
1001 			qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
1002 			j++;
1003 			if (str[j] == history_expansion_char)
1004 				j++;
1005 			loop_again = 0;
1006 			goto loop;
1007 		}
1008 		len = i - start;
1009 		ADD_STRING(&str[start], len, 0);
1010 
1011 		if (str[i] == '\0' || str[i] != history_expansion_char) {
1012 			len = j - i;
1013 			ADD_STRING(&str[i], len, 0);
1014 			if (start == 0)
1015 				ret = 0;
1016 			else
1017 				ret = 1;
1018 			break;
1019 		}
1020 		ret = _history_expand_command (str, i, (j - i), &tmp);
1021 		if (ret > 0 && tmp) {
1022 			len = strlen(tmp);
1023 			ADD_STRING(tmp, len, 1);
1024 		}
1025 		if (tmp) {
1026 			el_free(tmp);
1027 			tmp = NULL;
1028 		}
1029 		i = j;
1030 	}
1031 
1032 	/* ret is 2 for "print only" option */
1033 	if (ret == 2) {
1034 		add_history(result);
1035 #ifdef GDB_411_HACK
1036 		/* gdb 4.11 has been shipped with readline, where */
1037 		/* history_expand() returned -1 when the line	  */
1038 		/* should not be executed; in readline 2.1+	  */
1039 		/* it should return 2 in such a case		  */
1040 		ret = -1;
1041 #endif
1042 	}
1043 	el_free(*output);
1044 	*output = result;
1045 
1046 	return ret;
1047 }
1048 
1049 /*
1050 * Return a string consisting of arguments of "str" from "start" to "end".
1051 */
1052 char *
1053 history_arg_extract(int start, int end, const char *str)
1054 {
1055 	size_t  i, len, max;
1056 	char	**arr, *result = NULL;
1057 
1058 	arr = history_tokenize(str);
1059 	if (!arr)
1060 		return NULL;
1061 	if (arr && *arr == NULL)
1062 		goto out;
1063 
1064 	for (max = 0; arr[max]; max++)
1065 		continue;
1066 	max--;
1067 
1068 	if (start == '$')
1069 		start = (int)max;
1070 	if (end == '$')
1071 		end = (int)max;
1072 	if (end < 0)
1073 		end = (int)max + end + 1;
1074 	if (start < 0)
1075 		start = end;
1076 
1077 	if (start < 0 || end < 0 || (size_t)start > max ||
1078 	    (size_t)end > max || start > end)
1079 		goto out;
1080 
1081 	for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1082 		len += strlen(arr[i]) + 1;
1083 	len++;
1084 	result = el_calloc(len, sizeof(*result));
1085 	if (result == NULL)
1086 		goto out;
1087 
1088 	for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1089 		(void)strcpy(result + len, arr[i]);
1090 		len += strlen(arr[i]);
1091 		if (i < (size_t)end)
1092 			result[len++] = ' ';
1093 	}
1094 	result[len] = '\0';
1095 
1096 out:
1097 	for (i = 0; arr[i]; i++)
1098 		el_free(arr[i]);
1099 	el_free(arr);
1100 
1101 	return result;
1102 }
1103 
1104 /*
1105  * Parse the string into individual tokens,
1106  * similar to how shell would do it.
1107  */
1108 char **
1109 history_tokenize(const char *str)
1110 {
1111 	int size = 1, idx = 0, i, start;
1112 	size_t len;
1113 	char **result = NULL, *temp, delim = '\0';
1114 
1115 	for (i = 0; str[i];) {
1116 		while (isspace((unsigned char) str[i]))
1117 			i++;
1118 		start = i;
1119 		for (; str[i];) {
1120 			if (str[i] == '\\') {
1121 				if (str[i+1] != '\0')
1122 					i++;
1123 			} else if (str[i] == delim)
1124 				delim = '\0';
1125 			else if (!delim &&
1126 				    (isspace((unsigned char) str[i]) ||
1127 				strchr("()<>;&|$", str[i])))
1128 				break;
1129 			else if (!delim && strchr("'`\"", str[i]))
1130 				delim = str[i];
1131 			if (str[i])
1132 				i++;
1133 		}
1134 
1135 		if (idx + 2 >= size) {
1136 			char **nresult;
1137 			size <<= 1;
1138 			nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1139 			if (nresult == NULL) {
1140 				el_free(result);
1141 				return NULL;
1142 			}
1143 			result = nresult;
1144 		}
1145 		len = (size_t)i - (size_t)start;
1146 		temp = el_calloc(len + 1, sizeof(*temp));
1147 		if (temp == NULL) {
1148 			for (i = 0; i < idx; i++)
1149 				el_free(result[i]);
1150 			el_free(result);
1151 			return NULL;
1152 		}
1153 		(void)strncpy(temp, &str[start], len);
1154 		temp[len] = '\0';
1155 		result[idx++] = temp;
1156 		result[idx] = NULL;
1157 		if (str[i])
1158 			i++;
1159 	}
1160 	return result;
1161 }
1162 
1163 
1164 /*
1165  * limit size of history record to ``max'' events
1166  */
1167 void
1168 stifle_history(int max)
1169 {
1170 	HistEvent ev;
1171 	HIST_ENTRY *he;
1172 
1173 	if (h == NULL || e == NULL)
1174 		rl_initialize();
1175 
1176 	if (history(h, &ev, H_SETSIZE, max) == 0) {
1177 		max_input_history = max;
1178 		if (history_length > max)
1179 			history_base = history_length - max;
1180 		while (history_length > max) {
1181 			he = remove_history(0);
1182 			el_free(he->data);
1183 			el_free((void *)(unsigned long)he->line);
1184 			el_free(he);
1185 		}
1186 	}
1187 }
1188 
1189 
1190 /*
1191  * "unlimit" size of history - set the limit to maximum allowed int value
1192  */
1193 int
1194 unstifle_history(void)
1195 {
1196 	HistEvent ev;
1197 	int omax;
1198 
1199 	history(h, &ev, H_SETSIZE, INT_MAX);
1200 	omax = max_input_history;
1201 	max_input_history = INT_MAX;
1202 	return omax;		/* some value _must_ be returned */
1203 }
1204 
1205 
1206 int
1207 history_is_stifled(void)
1208 {
1209 
1210 	/* cannot return true answer */
1211 	return max_input_history != INT_MAX;
1212 }
1213 
1214 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1215 
1216 int
1217 history_truncate_file (const char *filename, int nlines)
1218 {
1219 	int ret = 0;
1220 	FILE *fp, *tp;
1221 	char template[sizeof(_history_tmp_template)];
1222 	char buf[4096];
1223 	int fd;
1224 	char *cp;
1225 	off_t off;
1226 	int count = 0;
1227 	ssize_t left = 0;
1228 
1229 	if (filename == NULL && (filename = _default_history_file()) == NULL)
1230 		return errno;
1231 	if ((fp = fopen(filename, "r+")) == NULL)
1232 		return errno;
1233 	strcpy(template, _history_tmp_template);
1234 	if ((fd = mkstemp(template)) == -1) {
1235 		ret = errno;
1236 		goto out1;
1237 	}
1238 
1239 	if ((tp = fdopen(fd, "r+")) == NULL) {
1240 		close(fd);
1241 		ret = errno;
1242 		goto out2;
1243 	}
1244 
1245 	for(;;) {
1246 		if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1247 			if (ferror(fp)) {
1248 				ret = errno;
1249 				break;
1250 			}
1251 			if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1252 			    (off_t)-1) {
1253 				ret = errno;
1254 				break;
1255 			}
1256 			left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1257 			if (ferror(fp)) {
1258 				ret = errno;
1259 				break;
1260 			}
1261 			if (left == 0) {
1262 				count--;
1263 				left = sizeof(buf);
1264 			} else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1265 			    != 1) {
1266 				ret = errno;
1267 				break;
1268 			}
1269 			fflush(tp);
1270 			break;
1271 		}
1272 		if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1273 			ret = errno;
1274 			break;
1275 		}
1276 		count++;
1277 	}
1278 	if (ret)
1279 		goto out3;
1280 	cp = buf + left - 1;
1281 	if(*cp != '\n')
1282 		cp++;
1283 	for(;;) {
1284 		while (--cp >= buf) {
1285 			if (*cp == '\n') {
1286 				if (--nlines == 0) {
1287 					if (++cp >= buf + sizeof(buf)) {
1288 						count++;
1289 						cp = buf;
1290 					}
1291 					break;
1292 				}
1293 			}
1294 		}
1295 		if (nlines <= 0 || count == 0)
1296 			break;
1297 		count--;
1298 		if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1299 			ret = errno;
1300 			break;
1301 		}
1302 		if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1303 			if (ferror(tp)) {
1304 				ret = errno;
1305 				break;
1306 			}
1307 			ret = EAGAIN;
1308 			break;
1309 		}
1310 		cp = buf + sizeof(buf);
1311 	}
1312 
1313 	if (ret || nlines > 0)
1314 		goto out3;
1315 
1316 	if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1317 		ret = errno;
1318 		goto out3;
1319 	}
1320 
1321 	if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1322 	    (off_t)-1) {
1323 		ret = errno;
1324 		goto out3;
1325 	}
1326 
1327 	for(;;) {
1328 		if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1329 			if (ferror(fp))
1330 				ret = errno;
1331 			break;
1332 		}
1333 		if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1334 			ret = errno;
1335 			break;
1336 		}
1337 	}
1338 	fflush(fp);
1339 	if((off = ftello(fp)) > 0)
1340 		(void)ftruncate(fileno(fp), off);
1341 out3:
1342 	fclose(tp);
1343 out2:
1344 	unlink(template);
1345 out1:
1346 	fclose(fp);
1347 
1348 	return ret;
1349 }
1350 
1351 
1352 /*
1353  * read history from a file given
1354  */
1355 int
1356 read_history(const char *filename)
1357 {
1358 	HistEvent ev;
1359 
1360 	if (h == NULL || e == NULL)
1361 		rl_initialize();
1362 	if (filename == NULL && (filename = _default_history_file()) == NULL)
1363 		return errno;
1364 	errno = 0;
1365 	if (history(h, &ev, H_LOAD, filename) == -1)
1366 	    return errno ? errno : EINVAL;
1367 	if (history(h, &ev, H_GETSIZE) == 0)
1368 		history_length = ev.num;
1369 	if (history_length < 0)
1370 		return EINVAL;
1371 	return 0;
1372 }
1373 
1374 
1375 /*
1376  * write history to a file given
1377  */
1378 int
1379 write_history(const char *filename)
1380 {
1381 	HistEvent ev;
1382 
1383 	if (h == NULL || e == NULL)
1384 		rl_initialize();
1385 	if (filename == NULL && (filename = _default_history_file()) == NULL)
1386 		return errno;
1387 	return history(h, &ev, H_SAVE, filename) == -1 ?
1388 	    (errno ? errno : EINVAL) : 0;
1389 }
1390 
1391 int
1392 append_history(int n, const char *filename)
1393 {
1394 	HistEvent ev;
1395 	FILE *fp;
1396 
1397 	if (h == NULL || e == NULL)
1398 		rl_initialize();
1399 	if (filename == NULL && (filename = _default_history_file()) == NULL)
1400 		return errno;
1401 
1402 	if ((fp = fopen(filename, "a")) == NULL)
1403 		return errno;
1404 
1405 	if (history(h, &ev, H_NSAVE_FP, (size_t)n,  fp) == -1) {
1406 		int serrno = errno ? errno : EINVAL;
1407 		fclose(fp);
1408 		return serrno;
1409 	}
1410 	fclose(fp);
1411 	return 0;
1412 }
1413 
1414 /*
1415  * returns history ``num''th event
1416  *
1417  * returned pointer points to static variable
1418  */
1419 HIST_ENTRY *
1420 history_get(int num)
1421 {
1422 	static HIST_ENTRY she;
1423 	HistEvent ev;
1424 	int curr_num;
1425 
1426 	if (h == NULL || e == NULL)
1427 		rl_initialize();
1428 
1429 	if (num < history_base)
1430 		return NULL;
1431 
1432 	/* save current position */
1433 	if (history(h, &ev, H_CURR) != 0)
1434 		return NULL;
1435 	curr_num = ev.num;
1436 
1437 	/*
1438 	 * use H_DELDATA to set to nth history (without delete) by passing
1439 	 * (void **)-1  -- as in history_set_pos
1440 	 */
1441 	if (history(h, &ev, H_DELDATA, num - history_base, (void **)-1) != 0)
1442 		goto out;
1443 
1444 	/* get current entry */
1445 	if (history(h, &ev, H_CURR) != 0)
1446 		goto out;
1447 	if (history(h, &ev, H_NEXT_EVDATA, ev.num, &she.data) != 0)
1448 		goto out;
1449 	she.line = ev.str;
1450 
1451 	/* restore pointer to where it was */
1452 	(void)history(h, &ev, H_SET, curr_num);
1453 
1454 	return &she;
1455 
1456 out:
1457 	/* restore pointer to where it was */
1458 	(void)history(h, &ev, H_SET, curr_num);
1459 	return NULL;
1460 }
1461 
1462 
1463 /*
1464  * add the line to history table
1465  */
1466 int
1467 add_history(const char *line)
1468 {
1469 	HistEvent ev;
1470 
1471 	if (h == NULL || e == NULL)
1472 		rl_initialize();
1473 
1474 	if (history(h, &ev, H_ENTER, line) == -1)
1475 		return 0;
1476 
1477 	(void)history(h, &ev, H_GETSIZE);
1478 	if (ev.num == history_length)
1479 		history_base++;
1480 	else {
1481 		history_offset++;
1482 		history_length = ev.num;
1483 	}
1484 	return 0;
1485 }
1486 
1487 
1488 /*
1489  * remove the specified entry from the history list and return it.
1490  */
1491 HIST_ENTRY *
1492 remove_history(int num)
1493 {
1494 	HIST_ENTRY *he;
1495 	HistEvent ev;
1496 
1497 	if (h == NULL || e == NULL)
1498 		rl_initialize();
1499 
1500 	if ((he = el_malloc(sizeof(*he))) == NULL)
1501 		return NULL;
1502 
1503 	if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1504 		el_free(he);
1505 		return NULL;
1506 	}
1507 
1508 	he->line = ev.str;
1509 	if (history(h, &ev, H_GETSIZE) == 0)
1510 		history_length = ev.num;
1511 
1512 	return he;
1513 }
1514 
1515 
1516 /*
1517  * replace the line and data of the num-th entry
1518  */
1519 HIST_ENTRY *
1520 replace_history_entry(int num, const char *line, histdata_t data)
1521 {
1522 	HIST_ENTRY *he;
1523 	HistEvent ev;
1524 	int curr_num;
1525 
1526 	if (h == NULL || e == NULL)
1527 		rl_initialize();
1528 
1529 	/* save current position */
1530 	if (history(h, &ev, H_CURR) != 0)
1531 		return NULL;
1532 	curr_num = ev.num;
1533 
1534 	/* start from the oldest */
1535 	if (history(h, &ev, H_LAST) != 0)
1536 		return NULL;	/* error */
1537 
1538 	if ((he = el_malloc(sizeof(*he))) == NULL)
1539 		return NULL;
1540 
1541 	/* look forwards for event matching specified offset */
1542 	if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1543 		goto out;
1544 
1545 	he->line = strdup(ev.str);
1546 	if (he->line == NULL)
1547 		goto out;
1548 
1549 	if (history(h, &ev, H_REPLACE, line, data))
1550 		goto out;
1551 
1552 	/* restore pointer to where it was */
1553 	if (history(h, &ev, H_SET, curr_num))
1554 		goto out;
1555 
1556 	return he;
1557 out:
1558 	el_free(he);
1559 	return NULL;
1560 }
1561 
1562 /*
1563  * clear the history list - delete all entries
1564  */
1565 void
1566 clear_history(void)
1567 {
1568 	HistEvent ev;
1569 
1570 	if (h == NULL || e == NULL)
1571 		rl_initialize();
1572 
1573 	(void)history(h, &ev, H_CLEAR);
1574 	history_offset = history_length = 0;
1575 }
1576 
1577 
1578 /*
1579  * returns offset of the current history event
1580  */
1581 int
1582 where_history(void)
1583 {
1584 	return history_offset;
1585 }
1586 
1587 static HIST_ENTRY **_history_listp;
1588 static HIST_ENTRY *_history_list;
1589 
1590 HIST_ENTRY **
1591 history_list(void)
1592 {
1593 	HistEvent ev;
1594 	HIST_ENTRY **nlp, *nl;
1595 	int i;
1596 
1597 	if (history(h, &ev, H_LAST) != 0)
1598 		return NULL;
1599 
1600 	if ((nlp = el_realloc(_history_listp,
1601 	    ((size_t)history_length + 1) * sizeof(*nlp))) == NULL)
1602 		return NULL;
1603 	_history_listp = nlp;
1604 
1605 	if ((nl = el_realloc(_history_list,
1606 	    (size_t)history_length * sizeof(*nl))) == NULL)
1607 		return NULL;
1608 	_history_list = nl;
1609 
1610 	i = 0;
1611 	do {
1612 		_history_listp[i] = &_history_list[i];
1613 		_history_list[i].line = ev.str;
1614 		_history_list[i].data = NULL;
1615 		if (i++ == history_length)
1616 			abort();
1617 	} while (history(h, &ev, H_PREV) == 0);
1618 	_history_listp[i] = NULL;
1619 	return _history_listp;
1620 }
1621 
1622 /*
1623  * returns current history event or NULL if there is no such event
1624  */
1625 HIST_ENTRY *
1626 current_history(void)
1627 {
1628 	HistEvent ev;
1629 
1630 	if (history(h, &ev, H_PREV_EVENT, history_offset + 1) != 0)
1631 		return NULL;
1632 
1633 	rl_he.line = ev.str;
1634 	rl_he.data = NULL;
1635 	return &rl_he;
1636 }
1637 
1638 
1639 /*
1640  * returns total number of bytes history events' data are using
1641  */
1642 int
1643 history_total_bytes(void)
1644 {
1645 	HistEvent ev;
1646 	int curr_num;
1647 	size_t size;
1648 
1649 	if (history(h, &ev, H_CURR) != 0)
1650 		return -1;
1651 	curr_num = ev.num;
1652 
1653 	(void)history(h, &ev, H_FIRST);
1654 	size = 0;
1655 	do
1656 		size += strlen(ev.str) * sizeof(*ev.str);
1657 	while (history(h, &ev, H_NEXT) == 0);
1658 
1659 	/* get to the same position as before */
1660 	history(h, &ev, H_PREV_EVENT, curr_num);
1661 
1662 	return (int)size;
1663 }
1664 
1665 
1666 /*
1667  * sets the position in the history list to ``pos''
1668  */
1669 int
1670 history_set_pos(int pos)
1671 {
1672 	if (pos >= history_length || pos < 0)
1673 		return 0;
1674 
1675 	history_offset = pos;
1676 	return 1;
1677 }
1678 
1679 
1680 /*
1681  * returns previous event in history and shifts pointer accordingly
1682  * Note that readline and editline define directions in opposite ways.
1683  */
1684 HIST_ENTRY *
1685 previous_history(void)
1686 {
1687 	HistEvent ev;
1688 
1689 	if (history_offset == 0)
1690 		return NULL;
1691 
1692 	if (history(h, &ev, H_LAST) != 0)
1693 		return NULL;
1694 
1695 	history_offset--;
1696 	return current_history();
1697 }
1698 
1699 
1700 /*
1701  * returns next event in history and shifts pointer accordingly
1702  */
1703 HIST_ENTRY *
1704 next_history(void)
1705 {
1706 	HistEvent ev;
1707 
1708 	if (history_offset >= history_length)
1709 		return NULL;
1710 
1711 	if (history(h, &ev, H_LAST) != 0)
1712 		return NULL;
1713 
1714 	history_offset++;
1715 	return current_history();
1716 }
1717 
1718 
1719 /*
1720  * searches for first history event containing the str
1721  */
1722 int
1723 history_search(const char *str, int direction)
1724 {
1725 	HistEvent ev;
1726 	const char *strp;
1727 	int curr_num;
1728 
1729 	if (history(h, &ev, H_CURR) != 0)
1730 		return -1;
1731 	curr_num = ev.num;
1732 
1733 	for (;;) {
1734 		if ((strp = strstr(ev.str, str)) != NULL)
1735 			return (int)(strp - ev.str);
1736 		if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1737 			break;
1738 	}
1739 	(void)history(h, &ev, H_SET, curr_num);
1740 	return -1;
1741 }
1742 
1743 
1744 /*
1745  * searches for first history event beginning with str
1746  */
1747 int
1748 history_search_prefix(const char *str, int direction)
1749 {
1750 	HistEvent ev;
1751 
1752 	return (history(h, &ev, direction < 0 ?
1753 	    H_PREV_STR : H_NEXT_STR, str));
1754 }
1755 
1756 
1757 /*
1758  * search for event in history containing str, starting at offset
1759  * abs(pos); continue backward, if pos<0, forward otherwise
1760  */
1761 /* ARGSUSED */
1762 int
1763 history_search_pos(const char *str,
1764 		   int direction __attribute__((__unused__)), int pos)
1765 {
1766 	HistEvent ev;
1767 	int curr_num, off;
1768 
1769 	off = (pos > 0) ? pos : -pos;
1770 	pos = (pos > 0) ? 1 : -1;
1771 
1772 	if (history(h, &ev, H_CURR) != 0)
1773 		return -1;
1774 	curr_num = ev.num;
1775 
1776 	if (!history_set_pos(off) || history(h, &ev, H_CURR) != 0)
1777 		return -1;
1778 
1779 	for (;;) {
1780 		if (strstr(ev.str, str))
1781 			return off;
1782 		if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1783 			break;
1784 	}
1785 
1786 	/* set "current" pointer back to previous state */
1787 	(void)history(h, &ev,
1788 	    pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1789 
1790 	return -1;
1791 }
1792 
1793 
1794 /********************************/
1795 /* completion functions */
1796 
1797 char *
1798 tilde_expand(char *name)
1799 {
1800 	return fn_tilde_expand(name);
1801 }
1802 
1803 char *
1804 filename_completion_function(const char *name, int state)
1805 {
1806 	return fn_filename_completion_function(name, state);
1807 }
1808 
1809 /*
1810  * a completion generator for usernames; returns _first_ username
1811  * which starts with supplied text
1812  * text contains a partial username preceded by random character
1813  * (usually '~'); state resets search from start (??? should we do that anyway)
1814  * it's the caller's responsibility to free the returned value
1815  */
1816 char *
1817 username_completion_function(const char *text, int state)
1818 {
1819 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1820 	struct passwd pwres;
1821 	char pwbuf[1024];
1822 #endif
1823 	struct passwd *pass = NULL;
1824 
1825 	if (text[0] == '\0')
1826 		return NULL;
1827 
1828 	if (*text == '~')
1829 		text++;
1830 
1831 	if (state == 0)
1832 		setpwent();
1833 
1834 	while (
1835 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1836 	    getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pass) == 0 && pass != NULL
1837 #else
1838 	    (pass = getpwent()) != NULL
1839 #endif
1840 	    && text[0] == pass->pw_name[0]
1841 	    && strcmp(text, pass->pw_name) == 0)
1842 		continue;
1843 
1844 	if (pass == NULL) {
1845 		endpwent();
1846 		return NULL;
1847 	}
1848 	return strdup(pass->pw_name);
1849 }
1850 
1851 
1852 /*
1853  * el-compatible wrapper to send TSTP on ^Z
1854  */
1855 /* ARGSUSED */
1856 static unsigned char
1857 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1858 {
1859 	(void)kill(0, SIGTSTP);
1860 	return CC_NORM;
1861 }
1862 
1863 static const char *
1864 /*ARGSUSED*/
1865 _rl_completion_append_character_function(const char *dummy
1866     __attribute__((__unused__)))
1867 {
1868 	static char buf[2];
1869 	buf[0] = (char)rl_completion_append_character;
1870 	buf[1] = '\0';
1871 	return buf;
1872 }
1873 
1874 
1875 /*
1876  * Display list of strings in columnar format on readline's output stream.
1877  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1878  * 'max' is maximum length of string in 'matches'.
1879  */
1880 void
1881 rl_display_match_list(char **matches, int len, int max)
1882 {
1883 
1884 	fn_display_match_list(e, matches, (size_t)len, (size_t)max,
1885 		_rl_completion_append_character_function);
1886 }
1887 
1888 /*
1889  * complete word at current point
1890  */
1891 /* ARGSUSED */
1892 int
1893 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1894 {
1895 	static ct_buffer_t wbreak_conv, sprefix_conv;
1896 	const char *breakchars;
1897 
1898 	if (h == NULL || e == NULL)
1899 		rl_initialize();
1900 
1901 	if (rl_inhibit_completion) {
1902 		char arr[2];
1903 		arr[0] = (char)invoking_key;
1904 		arr[1] = '\0';
1905 		el_insertstr(e, arr);
1906 		return CC_REFRESH;
1907 	}
1908 
1909 	if (rl_completion_word_break_hook != NULL)
1910 		breakchars = (*rl_completion_word_break_hook)();
1911 	else
1912 		breakchars = rl_basic_word_break_characters;
1913 
1914 	_rl_update_pos();
1915 
1916 	/* Just look at how many global variables modify this operation! */
1917 	return fn_complete(e,
1918 	    (rl_compentry_func_t *)rl_completion_entry_function,
1919 	    rl_attempted_completion_function,
1920 	    ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1921 	    ct_decode_string(breakchars, &sprefix_conv),
1922 	    _rl_completion_append_character_function,
1923 	    (size_t)rl_completion_query_items,
1924 	    &rl_completion_type, &rl_attempted_completion_over,
1925 	    &rl_point, &rl_end);
1926 
1927 
1928 }
1929 
1930 
1931 /* ARGSUSED */
1932 static unsigned char
1933 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1934 {
1935 	return (unsigned char)rl_complete(0, ch);
1936 }
1937 
1938 /*
1939  * misc other functions
1940  */
1941 
1942 /*
1943  * bind key c to readline-type function func
1944  */
1945 int
1946 rl_bind_key(int c, rl_command_func_t *func)
1947 {
1948 	int retval = -1;
1949 
1950 	if (h == NULL || e == NULL)
1951 		rl_initialize();
1952 
1953 	if (func == rl_insert) {
1954 		/* XXX notice there is no range checking of ``c'' */
1955 		e->el_map.key[c] = ED_INSERT;
1956 		retval = 0;
1957 	}
1958 	return retval;
1959 }
1960 
1961 
1962 /*
1963  * read one key from input - handles chars pushed back
1964  * to input stream also
1965  */
1966 int
1967 rl_read_key(void)
1968 {
1969 	char fooarr[2 * sizeof(int)];
1970 
1971 	if (e == NULL || h == NULL)
1972 		rl_initialize();
1973 
1974 	return el_getc(e, fooarr);
1975 }
1976 
1977 
1978 /*
1979  * reset the terminal
1980  */
1981 /* ARGSUSED */
1982 int
1983 rl_reset_terminal(const char *p __attribute__((__unused__)))
1984 {
1985 
1986 	if (h == NULL || e == NULL)
1987 		rl_initialize();
1988 	el_reset(e);
1989 	return 0;
1990 }
1991 
1992 
1993 /*
1994  * insert character ``c'' back into input stream, ``count'' times
1995  */
1996 int
1997 rl_insert(int count, int c)
1998 {
1999 	char arr[2];
2000 
2001 	if (h == NULL || e == NULL)
2002 		rl_initialize();
2003 
2004 	/* XXX - int -> char conversion can lose on multichars */
2005 	arr[0] = (char)c;
2006 	arr[1] = '\0';
2007 
2008 	for (; count > 0; count--)
2009 		el_push(e, arr);
2010 
2011 	return 0;
2012 }
2013 
2014 int
2015 rl_insert_text(const char *text)
2016 {
2017 	if (!text || *text == 0)
2018 		return 0;
2019 
2020 	if (h == NULL || e == NULL)
2021 		rl_initialize();
2022 
2023 	if (el_insertstr(e, text) < 0)
2024 		return 0;
2025 	return (int)strlen(text);
2026 }
2027 
2028 /*ARGSUSED*/
2029 int
2030 rl_newline(int count __attribute__((__unused__)),
2031     int c __attribute__((__unused__)))
2032 {
2033 	/*
2034 	 * Readline-4.0 appears to ignore the args.
2035 	 */
2036 	return rl_insert(1, '\n');
2037 }
2038 
2039 /*ARGSUSED*/
2040 static unsigned char
2041 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
2042 {
2043 	if (map[c] == NULL)
2044 	    return CC_ERROR;
2045 
2046 	_rl_update_pos();
2047 
2048 	(*map[c])(1, c);
2049 
2050 	/* If rl_done was set by the above call, deal with it here */
2051 	if (rl_done)
2052 		return CC_EOF;
2053 
2054 	return CC_NORM;
2055 }
2056 
2057 int
2058 rl_add_defun(const char *name, rl_command_func_t *fun, int c)
2059 {
2060 	char dest[8];
2061 	if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
2062 		return -1;
2063 	map[(unsigned char)c] = fun;
2064 	el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
2065 	vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
2066 	el_set(e, EL_BIND, dest, name, NULL);
2067 	return 0;
2068 }
2069 
2070 void
2071 rl_callback_read_char(void)
2072 {
2073 	int count = 0, done = 0;
2074 	const char *buf = el_gets(e, &count);
2075 	char *wbuf;
2076 
2077 	if (buf == NULL || count-- <= 0)
2078 		return;
2079 	if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
2080 		done = 1;
2081 	if (buf[count] == '\n' || buf[count] == '\r')
2082 		done = 2;
2083 
2084 	if (done && rl_linefunc != NULL) {
2085 		el_set(e, EL_UNBUFFERED, 0);
2086 		if (done == 2) {
2087 			if ((wbuf = strdup(buf)) != NULL)
2088 				wbuf[count] = '\0';
2089 		} else
2090 			wbuf = NULL;
2091 		(*(void (*)(const char *))rl_linefunc)(wbuf);
2092 		el_set(e, EL_UNBUFFERED, 1);
2093 	}
2094 }
2095 
2096 void
2097 rl_callback_handler_install(const char *prompt, rl_vcpfunc_t *linefunc)
2098 {
2099 	if (e == NULL) {
2100 		rl_initialize();
2101 	}
2102 	(void)rl_set_prompt(prompt);
2103 	rl_linefunc = linefunc;
2104 	el_set(e, EL_UNBUFFERED, 1);
2105 }
2106 
2107 void
2108 rl_callback_handler_remove(void)
2109 {
2110 	rl_linefunc = NULL;
2111 	el_end(e);
2112 	e = NULL;
2113 }
2114 
2115 void
2116 rl_redisplay(void)
2117 {
2118 	char a[2];
2119 	a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2120 	a[1] = '\0';
2121 	el_push(e, a);
2122 }
2123 
2124 int
2125 rl_get_previous_history(int count, int key)
2126 {
2127 	char a[2];
2128 	a[0] = (char)key;
2129 	a[1] = '\0';
2130 	while (count--)
2131 		el_push(e, a);
2132 	return 0;
2133 }
2134 
2135 void
2136 /*ARGSUSED*/
2137 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2138 {
2139 	el_set(e, EL_PREP_TERM, 1);
2140 }
2141 
2142 void
2143 rl_deprep_terminal(void)
2144 {
2145 	el_set(e, EL_PREP_TERM, 0);
2146 }
2147 
2148 int
2149 rl_read_init_file(const char *s)
2150 {
2151 	return el_source(e, s);
2152 }
2153 
2154 int
2155 rl_parse_and_bind(const char *line)
2156 {
2157 	const char **argv;
2158 	int argc;
2159 	Tokenizer *tok;
2160 
2161 	tok = tok_init(NULL);
2162 	tok_str(tok, line, &argc, &argv);
2163 	argc = el_parse(e, argc, argv);
2164 	tok_end(tok);
2165 	return argc ? 1 : 0;
2166 }
2167 
2168 int
2169 rl_variable_bind(const char *var, const char *value)
2170 {
2171 	/*
2172 	 * The proper return value is undocument, but this is what the
2173 	 * readline source seems to do.
2174 	 */
2175 	return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2176 }
2177 
2178 int
2179 rl_stuff_char(int c)
2180 {
2181 	char buf[2];
2182 
2183 	buf[0] = (char)c;
2184 	buf[1] = '\0';
2185 	el_insertstr(e, buf);
2186 	return 1;
2187 }
2188 
2189 static int
2190 _rl_event_read_char(EditLine *el, wchar_t *wc)
2191 {
2192 	char	ch;
2193 	int	n;
2194 	ssize_t num_read = 0;
2195 
2196 	ch = '\0';
2197 	*wc = L'\0';
2198 	while (rl_event_hook) {
2199 
2200 		(*rl_event_hook)();
2201 
2202 #if defined(FIONREAD)
2203 		if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2204 			return -1;
2205 		if (n)
2206 			num_read = read(el->el_infd, &ch, (size_t)1);
2207 		else
2208 			num_read = 0;
2209 #elif defined(F_SETFL) && defined(O_NDELAY)
2210 		if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2211 			return -1;
2212 		if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2213 			return -1;
2214 		num_read = read(el->el_infd, &ch, 1);
2215 		if (fcntl(el->el_infd, F_SETFL, n))
2216 			return -1;
2217 #else
2218 		/* not non-blocking, but what you gonna do? */
2219 		num_read = read(el->el_infd, &ch, 1);
2220 		return -1;
2221 #endif
2222 
2223 		if (num_read < 0 && errno == EAGAIN)
2224 			continue;
2225 		if (num_read == 0)
2226 			continue;
2227 		break;
2228 	}
2229 	if (!rl_event_hook)
2230 		el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2231 	*wc = (wchar_t)ch;
2232 	return (int)num_read;
2233 }
2234 
2235 static void
2236 _rl_update_pos(void)
2237 {
2238 	const LineInfo *li = el_line(e);
2239 
2240 	rl_point = (int)(li->cursor - li->buffer);
2241 	rl_end = (int)(li->lastchar - li->buffer);
2242 	rl_line_buffer[rl_end] = '\0';
2243 }
2244 
2245 void
2246 rl_get_screen_size(int *rows, int *cols)
2247 {
2248 	if (rows)
2249 		el_get(e, EL_GETTC, "li", rows);
2250 	if (cols)
2251 		el_get(e, EL_GETTC, "co", cols);
2252 }
2253 
2254 void
2255 rl_set_screen_size(int rows, int cols)
2256 {
2257 	char buf[64];
2258 	(void)snprintf(buf, sizeof(buf), "%d", rows);
2259 	el_set(e, EL_SETTC, "li", buf, NULL);
2260 	(void)snprintf(buf, sizeof(buf), "%d", cols);
2261 	el_set(e, EL_SETTC, "co", buf, NULL);
2262 }
2263 
2264 char **
2265 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2266 {
2267 	size_t len, max, i, j, min;
2268 	char **list, *match, *a, *b;
2269 
2270 	len = 1;
2271 	max = 10;
2272 	if ((list = el_calloc(max, sizeof(*list))) == NULL)
2273 		return NULL;
2274 
2275 	while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2276 		list[len++] = match;
2277 		if (len == max) {
2278 			char **nl;
2279 			max += 10;
2280 			if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2281 				goto out;
2282 			list = nl;
2283 		}
2284 	}
2285 	if (len == 1)
2286 		goto out;
2287 	list[len] = NULL;
2288 	if (len == 2) {
2289 		if ((list[0] = strdup(list[1])) == NULL)
2290 			goto out;
2291 		return list;
2292 	}
2293 	qsort(&list[1], len - 1, sizeof(*list),
2294 	    (int (*)(const void *, const void *)) strcmp);
2295 	min = SIZE_MAX;
2296 	for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2297 		b = list[i + 1];
2298 		for (j = 0; a[j] && a[j] == b[j]; j++)
2299 			continue;
2300 		if (min > j)
2301 			min = j;
2302 	}
2303 	if (min == 0 && *str) {
2304 		if ((list[0] = strdup(str)) == NULL)
2305 			goto out;
2306 	} else {
2307 		if ((list[0] = el_calloc(min + 1, sizeof(*list[0]))) == NULL)
2308 			goto out;
2309 		(void)memcpy(list[0], list[1], min);
2310 		list[0][min] = '\0';
2311 	}
2312 	return list;
2313 
2314 out:
2315 	el_free(list);
2316 	return NULL;
2317 }
2318 
2319 char *
2320 rl_filename_completion_function (const char *text, int state)
2321 {
2322 	return fn_filename_completion_function(text, state);
2323 }
2324 
2325 void
2326 rl_forced_update_display(void)
2327 {
2328 	el_set(e, EL_REFRESH);
2329 }
2330 
2331 int
2332 _rl_abort_internal(void)
2333 {
2334 	el_beep(e);
2335 	longjmp(topbuf, 1);
2336 	/*NOTREACHED*/
2337 }
2338 
2339 int
2340 _rl_qsort_string_compare(char **s1, char **s2)
2341 {
2342 	return strcoll(*s1, *s2);
2343 }
2344 
2345 HISTORY_STATE *
2346 history_get_history_state(void)
2347 {
2348 	HISTORY_STATE *hs;
2349 
2350 	if ((hs = el_malloc(sizeof(*hs))) == NULL)
2351 		return NULL;
2352 	hs->length = history_length;
2353 	return hs;
2354 }
2355 
2356 int
2357 /*ARGSUSED*/
2358 rl_kill_text(int from __attribute__((__unused__)),
2359     int to __attribute__((__unused__)))
2360 {
2361 	return 0;
2362 }
2363 
2364 Keymap
2365 rl_make_bare_keymap(void)
2366 {
2367 	return NULL;
2368 }
2369 
2370 Keymap
2371 rl_get_keymap(void)
2372 {
2373 	return NULL;
2374 }
2375 
2376 void
2377 /*ARGSUSED*/
2378 rl_set_keymap(Keymap k __attribute__((__unused__)))
2379 {
2380 }
2381 
2382 int
2383 /*ARGSUSED*/
2384 rl_generic_bind(int type __attribute__((__unused__)),
2385     const char * keyseq __attribute__((__unused__)),
2386     const char * data __attribute__((__unused__)),
2387     Keymap k __attribute__((__unused__)))
2388 {
2389 	return 0;
2390 }
2391 
2392 int
2393 /*ARGSUSED*/
2394 rl_bind_key_in_map(int key __attribute__((__unused__)),
2395     rl_command_func_t *fun __attribute__((__unused__)),
2396     Keymap k __attribute__((__unused__)))
2397 {
2398 	return 0;
2399 }
2400 
2401 /* unsupported, but needed by python */
2402 void
2403 rl_cleanup_after_signal(void)
2404 {
2405 }
2406 
2407 int
2408 rl_on_new_line(void)
2409 {
2410 	return 0;
2411 }
2412 
2413 void
2414 rl_free_line_state(void)
2415 {
2416 }
2417 
2418 int
2419 /*ARGSUSED*/
2420 rl_set_keyboard_input_timeout(int u __attribute__((__unused__)))
2421 {
2422 	return 0;
2423 }
2424 
2425 void
2426 rl_resize_terminal(void)
2427 {
2428 	el_resize(e);
2429 }
2430 
2431 void
2432 rl_reset_after_signal(void)
2433 {
2434 	if (rl_prep_term_function)
2435 		(*rl_prep_term_function)();
2436 }
2437 
2438 void
2439 rl_echo_signal_char(int sig)
2440 {
2441 	int c = tty_get_signal_character(e, sig);
2442 	if (c == -1)
2443 		return;
2444 	re_putc(e, c, 0);
2445 }
2446