readline.c revision 220178 
1/*	$NetBSD: readline.c,v 1.58 2005/07/14 15:00:58 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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the NetBSD
21 *	Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include "config.h"
40#if !defined(lint) && !defined(SCCSID)
41__RCSID("$NetBSD: readline.c,v 1.58 2005/07/14 15:00:58 christos Exp $");
42#endif /* not lint && not SCCSID */
43
44#include <sys/types.h>
45#include <sys/stat.h>
46#include <stdio.h>
47#include <dirent.h>
48#include <string.h>
49#include <pwd.h>
50#include <ctype.h>
51#include <stdlib.h>
52#include <unistd.h>
53#include <limits.h>
54#include <errno.h>
55#include <fcntl.h>
56#ifdef HAVE_VIS_H
57#include <vis.h>
58#else
59#include "np/vis.h"
60#endif
61#ifdef HAVE_ALLOCA_H
62#include <alloca.h>
63#endif
64#include "el.h"
65#include "fcns.h"		/* for EL_NUM_FCNS */
66#include "histedit.h"
67#include "readline/readline.h"
68#include "filecomplete.h"
69
70/* for rl_complete() */
71#define TAB		'\r'
72
73/* see comment at the #ifdef for sense of this */
74/* #define GDB_411_HACK */
75
76/* readline compatibility stuff - look at readline sources/documentation */
77/* to see what these variables mean */
78const char *rl_library_version = "EditLine wrapper";
79static char empty[] = { '\0' };
80static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
81static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
82    '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
83char *rl_readline_name = empty;
84FILE *rl_instream = NULL;
85FILE *rl_outstream = NULL;
86int rl_point = 0;
87int rl_end = 0;
88char *rl_line_buffer = NULL;
89VCPFunction *rl_linefunc = NULL;
90int rl_done = 0;
91VFunction *rl_event_hook = NULL;
92
93int history_base = 1;		/* probably never subject to change */
94int history_length = 0;
95int max_input_history = 0;
96char history_expansion_char = '!';
97char history_subst_char = '^';
98char *history_no_expand_chars = expand_chars;
99Function *history_inhibit_expansion_function = NULL;
100char *history_arg_extract(int start, int end, const char *str);
101
102int rl_inhibit_completion = 0;
103int rl_attempted_completion_over = 0;
104char *rl_basic_word_break_characters = break_chars;
105char *rl_completer_word_break_characters = NULL;
106char *rl_completer_quote_characters = NULL;
107Function *rl_completion_entry_function = NULL;
108CPPFunction *rl_attempted_completion_function = NULL;
109Function *rl_pre_input_hook = NULL;
110Function *rl_startup1_hook = NULL;
111Function *rl_getc_function = NULL;
112char *rl_terminal_name = NULL;
113int rl_already_prompted = 0;
114int rl_filename_completion_desired = 0;
115int rl_ignore_completion_duplicates = 0;
116int rl_catch_signals = 1;
117VFunction *rl_redisplay_function = NULL;
118Function *rl_startup_hook = NULL;
119VFunction *rl_completion_display_matches_hook = NULL;
120VFunction *rl_prep_term_function = NULL;
121VFunction *rl_deprep_term_function = NULL;
122
123/*
124 * The current prompt string.
125 */
126char *rl_prompt = NULL;
127/*
128 * This is set to character indicating type of completion being done by
129 * rl_complete_internal(); this is available for application completion
130 * functions.
131 */
132int rl_completion_type = 0;
133
134/*
135 * If more than this number of items results from query for possible
136 * completions, we ask user if they are sure to really display the list.
137 */
138int rl_completion_query_items = 100;
139
140/*
141 * List of characters which are word break characters, but should be left
142 * in the parsed text when it is passed to the completion function.
143 * Shell uses this to help determine what kind of completing to do.
144 */
145char *rl_special_prefixes = NULL;
146
147/*
148 * This is the character appended to the completed words if at the end of
149 * the line. Default is ' ' (a space).
150 */
151int rl_completion_append_character = ' ';
152
153/* stuff below is used internally by libedit for readline emulation */
154
155static History *h = NULL;
156static EditLine *e = NULL;
157static Function *map[256];
158
159/* internal functions */
160static unsigned char	 _el_rl_complete(EditLine *, int);
161static unsigned char	 _el_rl_tstp(EditLine *, int);
162static char		*_get_prompt(EditLine *);
163static HIST_ENTRY	*_move_history(int);
164static int		 _history_expand_command(const char *, size_t, size_t,
165    char **);
166static char		*_rl_compat_sub(const char *, const char *,
167    const char *, int);
168static int		 _rl_event_read_char(EditLine *, char *);
169static void		 _rl_update_pos(void);
170
171
172/* ARGSUSED */
173static char *
174_get_prompt(EditLine *el __attribute__((__unused__)))
175{
176	rl_already_prompted = 1;
177	return (rl_prompt);
178}
179
180
181/*
182 * generic function for moving around history
183 */
184static HIST_ENTRY *
185_move_history(int op)
186{
187	HistEvent ev;
188	static HIST_ENTRY rl_he;
189
190	if (history(h, &ev, op) != 0)
191		return (HIST_ENTRY *) NULL;
192
193	rl_he.line = ev.str;
194	rl_he.data = NULL;
195
196	return (&rl_he);
197}
198
199
200/*
201 * READLINE compatibility stuff
202 */
203
204/*
205 * initialize rl compat stuff
206 */
207int
208rl_initialize(void)
209{
210	HistEvent ev;
211	const LineInfo *li;
212	int editmode = 1;
213	struct termios t;
214
215	if (e != NULL)
216		el_end(e);
217	if (h != NULL)
218		history_end(h);
219
220	if (!rl_instream)
221		rl_instream = stdin;
222	if (!rl_outstream)
223		rl_outstream = stdout;
224
225	/*
226	 * See if we don't really want to run the editor
227	 */
228	if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
229		editmode = 0;
230
231	e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
232
233	if (!editmode)
234		el_set(e, EL_EDITMODE, 0);
235
236	h = history_init();
237	if (!e || !h)
238		return (-1);
239
240	history(h, &ev, H_SETSIZE, INT_MAX);	/* unlimited */
241	history_length = 0;
242	max_input_history = INT_MAX;
243	el_set(e, EL_HIST, history, h);
244
245	/* for proper prompt printing in readline() */
246	rl_prompt = strdup("");
247	if (rl_prompt == NULL) {
248		history_end(h);
249		el_end(e);
250		return -1;
251	}
252	el_set(e, EL_PROMPT, _get_prompt);
253	el_set(e, EL_SIGNAL, rl_catch_signals);
254
255	/* set default mode to "emacs"-style and read setting afterwards */
256	/* so this can be overriden */
257	el_set(e, EL_EDITOR, "emacs");
258	if (rl_terminal_name != NULL)
259		el_set(e, EL_TERMINAL, rl_terminal_name);
260	else
261		el_get(e, EL_TERMINAL, &rl_terminal_name);
262
263	/*
264	 * Word completion - this has to go AFTER rebinding keys
265	 * to emacs-style.
266	 */
267	el_set(e, EL_ADDFN, "rl_complete",
268	    "ReadLine compatible completion function",
269	    _el_rl_complete);
270	el_set(e, EL_BIND, "^I", "rl_complete", NULL);
271
272	/*
273	 * Send TSTP when ^Z is pressed.
274	 */
275	el_set(e, EL_ADDFN, "rl_tstp",
276	    "ReadLine compatible suspend function",
277	    _el_rl_tstp);
278	el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
279
280	/* read settings from configuration file */
281	el_source(e, NULL);
282
283	/*
284	 * Unfortunately, some applications really do use rl_point
285	 * and rl_line_buffer directly.
286	 */
287	li = el_line(e);
288	/* a cheesy way to get rid of const cast. */
289	rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
290	_rl_update_pos();
291
292	if (rl_startup_hook)
293		(*rl_startup_hook)(NULL, 0);
294
295	return (0);
296}
297
298
299/*
300 * read one line from input stream and return it, chomping
301 * trailing newline (if there is any)
302 */
303char *
304readline(const char *prompt)
305{
306	HistEvent ev;
307	int count;
308	const char *ret;
309	char *buf;
310	static int used_event_hook;
311
312	if (e == NULL || h == NULL)
313		rl_initialize();
314
315	rl_done = 0;
316
317	/* update prompt accordingly to what has been passed */
318	if (!prompt)
319		prompt = "";
320	if (strcmp(rl_prompt, prompt) != 0) {
321		free(rl_prompt);
322		rl_prompt = strdup(prompt);
323		if (rl_prompt == NULL)
324			return NULL;
325	}
326
327	if (rl_pre_input_hook)
328		(*rl_pre_input_hook)(NULL, 0);
329
330	if (rl_event_hook && !(e->el_flags&NO_TTY)) {
331		el_set(e, EL_GETCFN, _rl_event_read_char);
332		used_event_hook = 1;
333	}
334
335	if (!rl_event_hook && used_event_hook) {
336		el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
337		used_event_hook = 0;
338	}
339
340	rl_already_prompted = 0;
341
342	/* get one line from input stream */
343	ret = el_gets(e, &count);
344
345	if (ret && count > 0) {
346		int lastidx;
347
348		buf = strdup(ret);
349		if (buf == NULL)
350			return NULL;
351		lastidx = count - 1;
352		if (buf[lastidx] == '\n')
353			buf[lastidx] = '\0';
354	} else
355		buf = NULL;
356
357	history(h, &ev, H_GETSIZE);
358	history_length = ev.num;
359
360	return buf;
361}
362
363/*
364 * history functions
365 */
366
367/*
368 * is normally called before application starts to use
369 * history expansion functions
370 */
371void
372using_history(void)
373{
374	if (h == NULL || e == NULL)
375		rl_initialize();
376}
377
378
379/*
380 * substitute ``what'' with ``with'', returning resulting string; if
381 * globally == 1, substitutes all occurrences of what, otherwise only the
382 * first one
383 */
384static char *
385_rl_compat_sub(const char *str, const char *what, const char *with,
386    int globally)
387{
388	const	char	*s;
389	char	*r, *result;
390	size_t	len, with_len, what_len;
391
392	len = strlen(str);
393	with_len = strlen(with);
394	what_len = strlen(what);
395
396	/* calculate length we need for result */
397	s = str;
398	while (*s) {
399		if (*s == *what && !strncmp(s, what, what_len)) {
400			len += with_len - what_len;
401			if (!globally)
402				break;
403			s += what_len;
404		} else
405			s++;
406	}
407	r = result = malloc(len + 1);
408	if (result == NULL)
409		return NULL;
410	s = str;
411	while (*s) {
412		if (*s == *what && !strncmp(s, what, what_len)) {
413			(void)strncpy(r, with, with_len);
414			r += with_len;
415			s += what_len;
416			if (!globally) {
417				(void)strcpy(r, s);
418				return(result);
419			}
420		} else
421			*r++ = *s++;
422	}
423	*r = 0;
424	return(result);
425}
426
427static	char	*last_search_pat;	/* last !?pat[?] search pattern */
428static	char	*last_search_match;	/* last !?pat[?] that matched */
429
430const char *
431get_history_event(const char *cmd, int *cindex, int qchar)
432{
433	int idx, sign, sub, num, begin, ret;
434	size_t len;
435	char	*pat;
436	const char *rptr;
437	HistEvent ev;
438
439	idx = *cindex;
440	if (cmd[idx++] != history_expansion_char)
441		return(NULL);
442
443	/* find out which event to take */
444	if (cmd[idx] == history_expansion_char || cmd[idx] == 0) {
445		if (history(h, &ev, H_FIRST) != 0)
446			return(NULL);
447		*cindex = cmd[idx]? (idx + 1):idx;
448		return(ev.str);
449	}
450	sign = 0;
451	if (cmd[idx] == '-') {
452		sign = 1;
453		idx++;
454	}
455
456	if ('0' <= cmd[idx] && cmd[idx] <= '9') {
457		HIST_ENTRY *rl_he;
458
459		num = 0;
460		while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
461			num = num * 10 + cmd[idx] - '0';
462			idx++;
463		}
464		if (sign)
465			num = history_length - num + 1;
466
467		if (!(rl_he = history_get(num)))
468			return(NULL);
469
470		*cindex = idx;
471		return(rl_he->line);
472	}
473	sub = 0;
474	if (cmd[idx] == '?') {
475		sub = 1;
476		idx++;
477	}
478	begin = idx;
479	while (cmd[idx]) {
480		if (cmd[idx] == '\n')
481			break;
482		if (sub && cmd[idx] == '?')
483			break;
484		if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
485				    || cmd[idx] == '\t' || cmd[idx] == qchar))
486			break;
487		idx++;
488	}
489	len = idx - begin;
490	if (sub && cmd[idx] == '?')
491		idx++;
492	if (sub && len == 0 && last_search_pat && *last_search_pat)
493		pat = last_search_pat;
494	else if (len == 0)
495		return(NULL);
496	else {
497		if ((pat = malloc(len + 1)) == NULL)
498			return NULL;
499		(void)strncpy(pat, cmd + begin, len);
500		pat[len] = '\0';
501	}
502
503	if (history(h, &ev, H_CURR) != 0) {
504		if (pat != last_search_pat)
505			free(pat);
506		return (NULL);
507	}
508	num = ev.num;
509
510	if (sub) {
511		if (pat != last_search_pat) {
512			if (last_search_pat)
513				free(last_search_pat);
514			last_search_pat = pat;
515		}
516		ret = history_search(pat, -1);
517	} else
518		ret = history_search_prefix(pat, -1);
519
520	if (ret == -1) {
521		/* restore to end of list on failed search */
522		history(h, &ev, H_FIRST);
523		(void)fprintf(rl_outstream, "%s: Event not found\n", pat);
524		if (pat != last_search_pat)
525			free(pat);
526		return(NULL);
527	}
528
529	if (sub && len) {
530		if (last_search_match && last_search_match != pat)
531			free(last_search_match);
532		last_search_match = pat;
533	}
534
535	if (pat != last_search_pat)
536		free(pat);
537
538	if (history(h, &ev, H_CURR) != 0)
539		return(NULL);
540	*cindex = idx;
541	rptr = ev.str;
542
543	/* roll back to original position */
544	(void)history(h, &ev, H_SET, num);
545
546	return rptr;
547}
548
549/*
550 * the real function doing history expansion - takes as argument command
551 * to do and data upon which the command should be executed
552 * does expansion the way I've understood readline documentation
553 *
554 * returns 0 if data was not modified, 1 if it was and 2 if the string
555 * should be only printed and not executed; in case of error,
556 * returns -1 and *result points to NULL
557 * it's callers responsibility to free() string returned in *result
558 */
559static int
560_history_expand_command(const char *command, size_t offs, size_t cmdlen,
561    char **result)
562{
563	char *tmp, *search = NULL, *aptr;
564	const char *ptr, *cmd;
565	static char *from = NULL, *to = NULL;
566	int start, end, idx, has_mods = 0;
567	int p_on = 0, g_on = 0;
568
569	*result = NULL;
570	aptr = NULL;
571	ptr = NULL;
572
573	/* First get event specifier */
574	idx = 0;
575
576	if (strchr(":^*$", command[offs + 1])) {
577		char str[4];
578		/*
579		* "!:" is shorthand for "!!:".
580		* "!^", "!*" and "!$" are shorthand for
581		* "!!:^", "!!:*" and "!!:$" respectively.
582		*/
583		str[0] = str[1] = '!';
584		str[2] = '0';
585		ptr = get_history_event(str, &idx, 0);
586		idx = (command[offs + 1] == ':')? 1:0;
587		has_mods = 1;
588	} else {
589		if (command[offs + 1] == '#') {
590			/* use command so far */
591			if ((aptr = malloc(offs + 1)) == NULL)
592				return -1;
593			(void)strncpy(aptr, command, offs);
594			aptr[offs] = '\0';
595			idx = 1;
596		} else {
597			int	qchar;
598
599			qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
600			ptr = get_history_event(command + offs, &idx, qchar);
601		}
602		has_mods = command[offs + idx] == ':';
603	}
604
605	if (ptr == NULL && aptr == NULL)
606		return(-1);
607
608	if (!has_mods) {
609		*result = strdup(aptr? aptr : ptr);
610		if (aptr)
611			free(aptr);
612		return(1);
613	}
614
615	cmd = command + offs + idx + 1;
616
617	/* Now parse any word designators */
618
619	if (*cmd == '%')	/* last word matched by ?pat? */
620		tmp = strdup(last_search_match? last_search_match:"");
621	else if (strchr("^*$-0123456789", *cmd)) {
622		start = end = -1;
623		if (*cmd == '^')
624			start = end = 1, cmd++;
625		else if (*cmd == '$')
626			start = -1, cmd++;
627		else if (*cmd == '*')
628			start = 1, cmd++;
629	       else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
630			start = 0;
631			while (*cmd && '0' <= *cmd && *cmd <= '9')
632				start = start * 10 + *cmd++ - '0';
633
634			if (*cmd == '-') {
635				if (isdigit((unsigned char) cmd[1])) {
636					cmd++;
637					end = 0;
638					while (*cmd && '0' <= *cmd && *cmd <= '9')
639						end = end * 10 + *cmd++ - '0';
640				} else if (cmd[1] == '$') {
641					cmd += 2;
642					end = -1;
643				} else {
644					cmd++;
645					end = -2;
646				}
647			} else if (*cmd == '*')
648				end = -1, cmd++;
649			else
650				end = start;
651		}
652		tmp = history_arg_extract(start, end, aptr? aptr:ptr);
653		if (tmp == NULL) {
654			(void)fprintf(rl_outstream, "%s: Bad word specifier",
655			    command + offs + idx);
656			if (aptr)
657				free(aptr);
658			return(-1);
659		}
660	} else
661		tmp = strdup(aptr? aptr:ptr);
662
663	if (aptr)
664		free(aptr);
665
666	if (*cmd == 0 || (cmd - (command + offs) >= cmdlen)) {
667		*result = tmp;
668		return(1);
669	}
670
671	for (; *cmd; cmd++) {
672		if (*cmd == ':')
673			continue;
674		else if (*cmd == 'h') {		/* remove trailing path */
675			if ((aptr = strrchr(tmp, '/')) != NULL)
676				*aptr = 0;
677		} else if (*cmd == 't') {	/* remove leading path */
678			if ((aptr = strrchr(tmp, '/')) != NULL) {
679				aptr = strdup(aptr + 1);
680				free(tmp);
681				tmp = aptr;
682			}
683		} else if (*cmd == 'r') {	/* remove trailing suffix */
684			if ((aptr = strrchr(tmp, '.')) != NULL)
685				*aptr = 0;
686		} else if (*cmd == 'e') {	/* remove all but suffix */
687			if ((aptr = strrchr(tmp, '.')) != NULL) {
688				aptr = strdup(aptr);
689				free(tmp);
690				tmp = aptr;
691			}
692		} else if (*cmd == 'p')		/* print only */
693			p_on = 1;
694		else if (*cmd == 'g')
695			g_on = 2;
696		else if (*cmd == 's' || *cmd == '&') {
697			char *what, *with, delim;
698			size_t len, from_len;
699			size_t size;
700
701			if (*cmd == '&' && (from == NULL || to == NULL))
702				continue;
703			else if (*cmd == 's') {
704				delim = *(++cmd), cmd++;
705				size = 16;
706				what = realloc(from, size);
707				if (what == NULL) {
708					free(from);
709					return 0;
710				}
711				len = 0;
712				for (; *cmd && *cmd != delim; cmd++) {
713					if (*cmd == '\\' && cmd[1] == delim)
714						cmd++;
715					if (len >= size) {
716						char *nwhat;
717						nwhat = realloc(what,
718								(size <<= 1));
719						if (nwhat == NULL) {
720							free(what);
721							return 0;
722						}
723						what = nwhat;
724					}
725					what[len++] = *cmd;
726				}
727				what[len] = '\0';
728				from = what;
729				if (*what == '\0') {
730					free(what);
731					if (search) {
732						from = strdup(search);
733						if (from == NULL)
734							return 0;
735					} else {
736						from = NULL;
737						return (-1);
738					}
739				}
740				cmd++;	/* shift after delim */
741				if (!*cmd)
742					continue;
743
744				size = 16;
745				with = realloc(to, size);
746				if (with == NULL) {
747					free(to);
748					return -1;
749				}
750				len = 0;
751				from_len = strlen(from);
752				for (; *cmd && *cmd != delim; cmd++) {
753					if (len + from_len + 1 >= size) {
754						char *nwith;
755						size += from_len + 1;
756						nwith = realloc(with, size);
757						if (nwith == NULL) {
758							free(with);
759							return -1;
760						}
761						with = nwith;
762					}
763					if (*cmd == '&') {
764						/* safe */
765						(void)strcpy(&with[len], from);
766						len += from_len;
767						continue;
768					}
769					if (*cmd == '\\'
770					    && (*(cmd + 1) == delim
771						|| *(cmd + 1) == '&'))
772						cmd++;
773					with[len++] = *cmd;
774				}
775				with[len] = '\0';
776				to = with;
777			}
778
779			aptr = _rl_compat_sub(tmp, from, to, g_on);
780			if (aptr) {
781				free(tmp);
782				tmp = aptr;
783			}
784			g_on = 0;
785		}
786	}
787	*result = tmp;
788	return (p_on? 2:1);
789}
790
791
792/*
793 * csh-style history expansion
794 */
795int
796history_expand(char *str, char **output)
797{
798	int ret = 0;
799	size_t idx, i, size;
800	char *tmp, *result;
801
802	if (h == NULL || e == NULL)
803		rl_initialize();
804
805	if (history_expansion_char == 0) {
806		*output = strdup(str);
807		return(0);
808	}
809
810	*output = NULL;
811	if (str[0] == history_subst_char) {
812		/* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
813		*output = malloc(strlen(str) + 4 + 1);
814		if (*output == NULL)
815			return 0;
816		(*output)[0] = (*output)[1] = history_expansion_char;
817		(*output)[2] = ':';
818		(*output)[3] = 's';
819		(void)strcpy((*output) + 4, str);
820		str = *output;
821	} else {
822		*output = strdup(str);
823		if (*output == NULL)
824			return 0;
825	}
826
827#define ADD_STRING(what, len)						\
828	{								\
829		if (idx + len + 1 > size) {				\
830			char *nresult = realloc(result, (size += len + 1));\
831			if (nresult == NULL) {				\
832				free(*output);				\
833				return 0;				\
834			}						\
835			result = nresult;				\
836		}							\
837		(void)strncpy(&result[idx], what, len);			\
838		idx += len;						\
839		result[idx] = '\0';					\
840	}
841
842	result = NULL;
843	size = idx = 0;
844	for (i = 0; str[i];) {
845		int qchar, loop_again;
846		size_t len, start, j;
847
848		qchar = 0;
849		loop_again = 1;
850		start = j = i;
851loop:
852		for (; str[j]; j++) {
853			if (str[j] == '\\' &&
854			    str[j + 1] == history_expansion_char) {
855				(void)strcpy(&str[j], &str[j + 1]);
856				continue;
857			}
858			if (!loop_again) {
859				if (isspace((unsigned char) str[j])
860				    || str[j] == qchar)
861					break;
862			}
863			if (str[j] == history_expansion_char
864			    && !strchr(history_no_expand_chars, str[j + 1])
865			    && (!history_inhibit_expansion_function ||
866			    (*history_inhibit_expansion_function)(str,
867			    (int)j) == 0))
868				break;
869		}
870
871		if (str[j] && loop_again) {
872			i = j;
873			qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
874			j++;
875			if (str[j] == history_expansion_char)
876				j++;
877			loop_again = 0;
878			goto loop;
879		}
880		len = i - start;
881		tmp = &str[start];
882		ADD_STRING(tmp, len);
883
884		if (str[i] == '\0' || str[i] != history_expansion_char) {
885			len = j - i;
886			tmp = &str[i];
887			ADD_STRING(tmp, len);
888			if (start == 0)
889				ret = 0;
890			else
891				ret = 1;
892			break;
893		}
894		ret = _history_expand_command (str, i, (j - i), &tmp);
895		if (ret > 0 && tmp) {
896			len = strlen(tmp);
897			ADD_STRING(tmp, len);
898			free(tmp);
899		}
900		i = j;
901	}
902
903	/* ret is 2 for "print only" option */
904	if (ret == 2) {
905		add_history(result);
906#ifdef GDB_411_HACK
907		/* gdb 4.11 has been shipped with readline, where */
908		/* history_expand() returned -1 when the line	  */
909		/* should not be executed; in readline 2.1+	  */
910		/* it should return 2 in such a case		  */
911		ret = -1;
912#endif
913	}
914	free(*output);
915	*output = result;
916
917	return (ret);
918}
919
920/*
921* Return a string consisting of arguments of "str" from "start" to "end".
922*/
923char *
924history_arg_extract(int start, int end, const char *str)
925{
926	size_t  i, len, max;
927	char	**arr, *result;
928
929	arr = history_tokenize(str);
930	if (!arr)
931		return(NULL);
932	if (arr && *arr == NULL) {
933		free(arr);
934		return(NULL);
935	}
936
937	for (max = 0; arr[max]; max++)
938		continue;
939	max--;
940
941	if (start == '$')
942		start = max;
943	if (end == '$')
944		end = max;
945	if (end < 0)
946		end = max + end + 1;
947	if (start < 0)
948		start = end;
949
950	if (start < 0 || end < 0 || start > max || end > max || start > end)
951		return(NULL);
952
953	for (i = start, len = 0; i <= end; i++)
954		len += strlen(arr[i]) + 1;
955	len++;
956	result = malloc(len);
957	if (result == NULL)
958		return NULL;
959
960	for (i = start, len = 0; i <= end; i++) {
961		(void)strcpy(result + len, arr[i]);
962		len += strlen(arr[i]);
963		if (i < end)
964			result[len++] = ' ';
965	}
966	result[len] = 0;
967
968	for (i = 0; arr[i]; i++)
969		free(arr[i]);
970	free(arr);
971
972	return(result);
973}
974
975/*
976 * Parse the string into individual tokens,
977 * similar to how shell would do it.
978 */
979char **
980history_tokenize(const char *str)
981{
982	int size = 1, idx = 0, i, start;
983	size_t len;
984	char **result = NULL, *temp, delim = '\0';
985
986	for (i = 0; str[i];) {
987		while (isspace((unsigned char) str[i]))
988			i++;
989		start = i;
990		for (; str[i];) {
991			if (str[i] == '\\') {
992				if (str[i+1] != '\0')
993					i++;
994			} else if (str[i] == delim)
995				delim = '\0';
996			else if (!delim &&
997				    (isspace((unsigned char) str[i]) ||
998				strchr("()<>;&|$", str[i])))
999				break;
1000			else if (!delim && strchr("'`\"", str[i]))
1001				delim = str[i];
1002			if (str[i])
1003				i++;
1004		}
1005
1006		if (idx + 2 >= size) {
1007			char **nresult;
1008			size <<= 1;
1009			nresult = realloc(result, size * sizeof(char *));
1010			if (nresult == NULL) {
1011				free(result);
1012				return NULL;
1013			}
1014			result = nresult;
1015		}
1016		len = i - start;
1017		temp = malloc(len + 1);
1018		if (temp == NULL) {
1019			for (i = 0; i < idx; i++)
1020				free(result[i]);
1021			free(result);
1022			return NULL;
1023		}
1024		(void)strncpy(temp, &str[start], len);
1025		temp[len] = '\0';
1026		result[idx++] = temp;
1027		result[idx] = NULL;
1028		if (str[i])
1029			i++;
1030	}
1031	return (result);
1032}
1033
1034
1035/*
1036 * limit size of history record to ``max'' events
1037 */
1038void
1039stifle_history(int max)
1040{
1041	HistEvent ev;
1042
1043	if (h == NULL || e == NULL)
1044		rl_initialize();
1045
1046	if (history(h, &ev, H_SETSIZE, max) == 0)
1047		max_input_history = max;
1048}
1049
1050
1051/*
1052 * "unlimit" size of history - set the limit to maximum allowed int value
1053 */
1054int
1055unstifle_history(void)
1056{
1057	HistEvent ev;
1058	int omax;
1059
1060	history(h, &ev, H_SETSIZE, INT_MAX);
1061	omax = max_input_history;
1062	max_input_history = INT_MAX;
1063	return (omax);		/* some value _must_ be returned */
1064}
1065
1066
1067int
1068history_is_stifled(void)
1069{
1070
1071	/* cannot return true answer */
1072	return (max_input_history != INT_MAX);
1073}
1074
1075
1076/*
1077 * read history from a file given
1078 */
1079int
1080read_history(const char *filename)
1081{
1082	HistEvent ev;
1083
1084	if (h == NULL || e == NULL)
1085		rl_initialize();
1086	return (history(h, &ev, H_LOAD, filename));
1087}
1088
1089
1090/*
1091 * write history to a file given
1092 */
1093int
1094write_history(const char *filename)
1095{
1096	HistEvent ev;
1097
1098	if (h == NULL || e == NULL)
1099		rl_initialize();
1100	return (history(h, &ev, H_SAVE, filename));
1101}
1102
1103
1104/*
1105 * returns history ``num''th event
1106 *
1107 * returned pointer points to static variable
1108 */
1109HIST_ENTRY *
1110history_get(int num)
1111{
1112	static HIST_ENTRY she;
1113	HistEvent ev;
1114	int curr_num;
1115
1116	if (h == NULL || e == NULL)
1117		rl_initialize();
1118
1119	/* save current position */
1120	if (history(h, &ev, H_CURR) != 0)
1121		return (NULL);
1122	curr_num = ev.num;
1123
1124	/* start from most recent */
1125	if (history(h, &ev, H_FIRST) != 0)
1126		return (NULL);	/* error */
1127
1128	/* look backwards for event matching specified offset */
1129	if (history(h, &ev, H_NEXT_EVENT, num))
1130		return (NULL);
1131
1132	she.line = ev.str;
1133	she.data = NULL;
1134
1135	/* restore pointer to where it was */
1136	(void)history(h, &ev, H_SET, curr_num);
1137
1138	return (&she);
1139}
1140
1141
1142/*
1143 * add the line to history table
1144 */
1145int
1146add_history(const char *line)
1147{
1148	HistEvent ev;
1149
1150	if (h == NULL || e == NULL)
1151		rl_initialize();
1152
1153	(void)history(h, &ev, H_ENTER, line);
1154	if (history(h, &ev, H_GETSIZE) == 0)
1155		history_length = ev.num;
1156
1157	return (!(history_length > 0)); /* return 0 if all is okay */
1158}
1159
1160
1161/*
1162 * remove the specified entry from the history list and return it.
1163 */
1164HIST_ENTRY *
1165remove_history(int num)
1166{
1167	static HIST_ENTRY she;
1168	HistEvent ev;
1169
1170	if (h == NULL || e == NULL)
1171		rl_initialize();
1172
1173	if (history(h, &ev, H_DEL, num) != 0)
1174		return NULL;
1175
1176	she.line = ev.str;
1177	she.data = NULL;
1178
1179	return &she;
1180}
1181
1182
1183/*
1184 * clear the history list - delete all entries
1185 */
1186void
1187clear_history(void)
1188{
1189	HistEvent ev;
1190
1191	history(h, &ev, H_CLEAR);
1192}
1193
1194
1195/*
1196 * returns offset of the current history event
1197 */
1198int
1199where_history(void)
1200{
1201	HistEvent ev;
1202	int curr_num, off;
1203
1204	if (history(h, &ev, H_CURR) != 0)
1205		return (0);
1206	curr_num = ev.num;
1207
1208	history(h, &ev, H_FIRST);
1209	off = 1;
1210	while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1211		off++;
1212
1213	return (off);
1214}
1215
1216
1217/*
1218 * returns current history event or NULL if there is no such event
1219 */
1220HIST_ENTRY *
1221current_history(void)
1222{
1223
1224	return (_move_history(H_CURR));
1225}
1226
1227
1228/*
1229 * returns total number of bytes history events' data are using
1230 */
1231int
1232history_total_bytes(void)
1233{
1234	HistEvent ev;
1235	int curr_num, size;
1236
1237	if (history(h, &ev, H_CURR) != 0)
1238		return (-1);
1239	curr_num = ev.num;
1240
1241	history(h, &ev, H_FIRST);
1242	size = 0;
1243	do
1244		size += strlen(ev.str);
1245	while (history(h, &ev, H_NEXT) == 0);
1246
1247	/* get to the same position as before */
1248	history(h, &ev, H_PREV_EVENT, curr_num);
1249
1250	return (size);
1251}
1252
1253
1254/*
1255 * sets the position in the history list to ``pos''
1256 */
1257int
1258history_set_pos(int pos)
1259{
1260	HistEvent ev;
1261	int curr_num;
1262
1263	if (pos > history_length || pos < 0)
1264		return (-1);
1265
1266	history(h, &ev, H_CURR);
1267	curr_num = ev.num;
1268
1269	if (history(h, &ev, H_SET, pos)) {
1270		history(h, &ev, H_SET, curr_num);
1271		return(-1);
1272	}
1273	return (0);
1274}
1275
1276
1277/*
1278 * returns previous event in history and shifts pointer accordingly
1279 */
1280HIST_ENTRY *
1281previous_history(void)
1282{
1283
1284	return (_move_history(H_PREV));
1285}
1286
1287
1288/*
1289 * returns next event in history and shifts pointer accordingly
1290 */
1291HIST_ENTRY *
1292next_history(void)
1293{
1294
1295	return (_move_history(H_NEXT));
1296}
1297
1298
1299/*
1300 * searches for first history event containing the str
1301 */
1302int
1303history_search(const char *str, int direction)
1304{
1305	HistEvent ev;
1306	const char *strp;
1307	int curr_num;
1308
1309	if (history(h, &ev, H_CURR) != 0)
1310		return (-1);
1311	curr_num = ev.num;
1312
1313	for (;;) {
1314		if ((strp = strstr(ev.str, str)) != NULL)
1315			return (int) (strp - ev.str);
1316		if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1317			break;
1318	}
1319	history(h, &ev, H_SET, curr_num);
1320	return (-1);
1321}
1322
1323
1324/*
1325 * searches for first history event beginning with str
1326 */
1327int
1328history_search_prefix(const char *str, int direction)
1329{
1330	HistEvent ev;
1331
1332	return (history(h, &ev, direction < 0? H_PREV_STR:H_NEXT_STR, str));
1333}
1334
1335
1336/*
1337 * search for event in history containing str, starting at offset
1338 * abs(pos); continue backward, if pos<0, forward otherwise
1339 */
1340/* ARGSUSED */
1341int
1342history_search_pos(const char *str,
1343		   int direction __attribute__((__unused__)), int pos)
1344{
1345	HistEvent ev;
1346	int curr_num, off;
1347
1348	off = (pos > 0) ? pos : -pos;
1349	pos = (pos > 0) ? 1 : -1;
1350
1351	if (history(h, &ev, H_CURR) != 0)
1352		return (-1);
1353	curr_num = ev.num;
1354
1355	if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1356		return (-1);
1357
1358
1359	for (;;) {
1360		if (strstr(ev.str, str))
1361			return (off);
1362		if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1363			break;
1364	}
1365
1366	/* set "current" pointer back to previous state */
1367	history(h, &ev, (pos < 0) ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1368
1369	return (-1);
1370}
1371
1372
1373/********************************/
1374/* completion functions */
1375
1376char *
1377tilde_expand(char *name)
1378{
1379	return fn_tilde_expand(name);
1380}
1381
1382char *
1383filename_completion_function(const char *name, int state)
1384{
1385	return fn_filename_completion_function(name, state);
1386}
1387
1388/*
1389 * a completion generator for usernames; returns _first_ username
1390 * which starts with supplied text
1391 * text contains a partial username preceded by random character
1392 * (usually '~'); state is ignored
1393 * it's callers responsibility to free returned value
1394 */
1395char *
1396username_completion_function(const char *text, int state)
1397{
1398	struct passwd *pwd, pwres;
1399	char pwbuf[1024];
1400
1401	if (text[0] == '\0')
1402		return (NULL);
1403
1404	if (*text == '~')
1405		text++;
1406
1407	if (state == 0)
1408		setpwent();
1409
1410	while (getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pwd) == 0
1411	    && pwd != NULL && text[0] == pwd->pw_name[0]
1412	    && strcmp(text, pwd->pw_name) == 0);
1413
1414	if (pwd == NULL) {
1415		endpwent();
1416		return (NULL);
1417	}
1418	return (strdup(pwd->pw_name));
1419}
1420
1421
1422/*
1423 * el-compatible wrapper to send TSTP on ^Z
1424 */
1425/* ARGSUSED */
1426static unsigned char
1427_el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1428{
1429	(void)kill(0, SIGTSTP);
1430	return CC_NORM;
1431}
1432
1433/*
1434 * Display list of strings in columnar format on readline's output stream.
1435 * 'matches' is list of strings, 'len' is number of strings in 'matches',
1436 * 'max' is maximum length of string in 'matches'.
1437 */
1438void
1439rl_display_match_list(char **matches, int len, int max)
1440{
1441
1442	fn_display_match_list(e, matches, len, max);
1443}
1444
1445static const char *
1446/*ARGSUSED*/
1447_rl_completion_append_character_function(const char *dummy
1448    __attribute__((__unused__)))
1449{
1450	static char buf[2];
1451	buf[1] = rl_completion_append_character;
1452	return buf;
1453}
1454
1455
1456/*
1457 * complete word at current point
1458 */
1459/* ARGSUSED */
1460int
1461rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1462{
1463	if (h == NULL || e == NULL)
1464		rl_initialize();
1465
1466	if (rl_inhibit_completion) {
1467		char arr[2];
1468		arr[0] = (char)invoking_key;
1469		arr[1] = '\0';
1470		el_insertstr(e, arr);
1471		return (CC_REFRESH);
1472	}
1473
1474	/* Just look at how many global variables modify this operation! */
1475	return fn_complete(e,
1476	    (CPFunction *)rl_completion_entry_function,
1477	    rl_attempted_completion_function,
1478	    rl_basic_word_break_characters, rl_special_prefixes,
1479	    _rl_completion_append_character_function, rl_completion_query_items,
1480	    &rl_completion_type, &rl_attempted_completion_over,
1481	    &rl_point, &rl_end);
1482}
1483
1484
1485/* ARGSUSED */
1486static unsigned char
1487_el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1488{
1489	return (unsigned char)rl_complete(0, ch);
1490}
1491
1492/*
1493 * misc other functions
1494 */
1495
1496/*
1497 * bind key c to readline-type function func
1498 */
1499int
1500rl_bind_key(int c, int func(int, int))
1501{
1502	int retval = -1;
1503
1504	if (h == NULL || e == NULL)
1505		rl_initialize();
1506
1507	if (func == rl_insert) {
1508		/* XXX notice there is no range checking of ``c'' */
1509		e->el_map.key[c] = ED_INSERT;
1510		retval = 0;
1511	}
1512	return (retval);
1513}
1514
1515
1516/*
1517 * read one key from input - handles chars pushed back
1518 * to input stream also
1519 */
1520int
1521rl_read_key(void)
1522{
1523	char fooarr[2 * sizeof(int)];
1524
1525	if (e == NULL || h == NULL)
1526		rl_initialize();
1527
1528	return (el_getc(e, fooarr));
1529}
1530
1531
1532/*
1533 * reset the terminal
1534 */
1535/* ARGSUSED */
1536void
1537rl_reset_terminal(const char *p __attribute__((__unused__)))
1538{
1539
1540	if (h == NULL || e == NULL)
1541		rl_initialize();
1542	el_reset(e);
1543}
1544
1545
1546/*
1547 * insert character ``c'' back into input stream, ``count'' times
1548 */
1549int
1550rl_insert(int count, int c)
1551{
1552	char arr[2];
1553
1554	if (h == NULL || e == NULL)
1555		rl_initialize();
1556
1557	/* XXX - int -> char conversion can lose on multichars */
1558	arr[0] = c;
1559	arr[1] = '\0';
1560
1561	for (; count > 0; count--)
1562		el_push(e, arr);
1563
1564	return (0);
1565}
1566
1567/*ARGSUSED*/
1568int
1569rl_newline(int count, int c)
1570{
1571	/*
1572	 * Readline-4.0 appears to ignore the args.
1573	 */
1574	return rl_insert(1, '\n');
1575}
1576
1577/*ARGSUSED*/
1578static unsigned char
1579rl_bind_wrapper(EditLine *el, unsigned char c)
1580{
1581	if (map[c] == NULL)
1582	    return CC_ERROR;
1583
1584	_rl_update_pos();
1585
1586	(*map[c])(NULL, c);
1587
1588	/* If rl_done was set by the above call, deal with it here */
1589	if (rl_done)
1590		return CC_EOF;
1591
1592	return CC_NORM;
1593}
1594
1595int
1596rl_add_defun(const char *name, Function *fun, int c)
1597{
1598	char dest[8];
1599	if (c >= sizeof(map) / sizeof(map[0]) || c < 0)
1600		return -1;
1601	map[(unsigned char)c] = fun;
1602	el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1603	vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1604	el_set(e, EL_BIND, dest, name);
1605	return 0;
1606}
1607
1608void
1609rl_callback_read_char()
1610{
1611	int count = 0, done = 0;
1612	const char *buf = el_gets(e, &count);
1613	char *wbuf;
1614
1615	if (buf == NULL || count-- <= 0)
1616		return;
1617	if (count == 0 && buf[0] == CTRL('d'))
1618		done = 1;
1619	if (buf[count] == '\n' || buf[count] == '\r')
1620		done = 2;
1621
1622	if (done && rl_linefunc != NULL) {
1623		el_set(e, EL_UNBUFFERED, 0);
1624		if (done == 2) {
1625		    if ((wbuf = strdup(buf)) != NULL)
1626			wbuf[count] = '\0';
1627		} else
1628			wbuf = NULL;
1629		(*(void (*)(const char *))rl_linefunc)(wbuf);
1630		el_set(e, EL_UNBUFFERED, 1);
1631	}
1632}
1633
1634void
1635rl_callback_handler_install (const char *prompt, VCPFunction *linefunc)
1636{
1637	if (e == NULL) {
1638		rl_initialize();
1639	}
1640	if (rl_prompt)
1641		free(rl_prompt);
1642	rl_prompt = prompt ? strdup(strchr(prompt, *prompt)) : NULL;
1643	rl_linefunc = linefunc;
1644	el_set(e, EL_UNBUFFERED, 1);
1645}
1646
1647void
1648rl_callback_handler_remove(void)
1649{
1650	el_set(e, EL_UNBUFFERED, 0);
1651}
1652
1653void
1654rl_redisplay(void)
1655{
1656	char a[2];
1657	a[0] = CTRL('r');
1658	a[1] = '\0';
1659	el_push(e, a);
1660}
1661
1662int
1663rl_get_previous_history(int count, int key)
1664{
1665	char a[2];
1666	a[0] = key;
1667	a[1] = '\0';
1668	while (count--)
1669		el_push(e, a);
1670	return 0;
1671}
1672
1673void
1674/*ARGSUSED*/
1675rl_prep_terminal(int meta_flag)
1676{
1677	el_set(e, EL_PREP_TERM, 1);
1678}
1679
1680void
1681rl_deprep_terminal()
1682{
1683	el_set(e, EL_PREP_TERM, 0);
1684}
1685
1686int
1687rl_read_init_file(const char *s)
1688{
1689	return(el_source(e, s));
1690}
1691
1692int
1693rl_parse_and_bind(const char *line)
1694{
1695	const char **argv;
1696	int argc;
1697	Tokenizer *tok;
1698
1699	tok = tok_init(NULL);
1700	tok_str(tok, line, &argc, &argv);
1701	argc = el_parse(e, argc, argv);
1702	tok_end(tok);
1703	return (argc ? 1 : 0);
1704}
1705
1706int
1707rl_variable_bind(const char *var, const char *value)
1708{
1709	/*
1710	 * The proper return value is undocument, but this is what the
1711	 * readline source seems to do.
1712	 */
1713	return ((el_set(e, EL_BIND, "", var, value) == -1) ? 1 : 0);
1714}
1715
1716void
1717rl_stuff_char(int c)
1718{
1719	char buf[2];
1720
1721	buf[0] = c;
1722	buf[1] = '\0';
1723	el_insertstr(e, buf);
1724}
1725
1726static int
1727_rl_event_read_char(EditLine *el, char *cp)
1728{
1729	int	n, num_read = 0;
1730
1731	*cp = 0;
1732	while (rl_event_hook) {
1733
1734		(*rl_event_hook)();
1735
1736#if defined(FIONREAD)
1737		if (ioctl(el->el_infd, FIONREAD, &n) < 0)
1738			return(-1);
1739		if (n)
1740			num_read = read(el->el_infd, cp, 1);
1741		else
1742			num_read = 0;
1743#elif defined(F_SETFL) && defined(O_NDELAY)
1744		if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
1745			return(-1);
1746		if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
1747			return(-1);
1748		num_read = read(el->el_infd, cp, 1);
1749		if (fcntl(el->el_infd, F_SETFL, n))
1750			return(-1);
1751#else
1752		/* not non-blocking, but what you gonna do? */
1753		num_read = read(el->el_infd, cp, 1);
1754		return(-1);
1755#endif
1756
1757		if (num_read < 0 && errno == EAGAIN)
1758			continue;
1759		if (num_read == 0)
1760			continue;
1761		break;
1762	}
1763	if (!rl_event_hook)
1764		el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
1765	return(num_read);
1766}
1767
1768static void
1769_rl_update_pos(void)
1770{
1771	const LineInfo *li = el_line(e);
1772
1773	rl_point = li->cursor - li->buffer;
1774	rl_end = li->lastchar - li->buffer;
1775}
1776