readline.c revision 220329 
1/*	$NetBSD: readline.c,v 1.90 2010/08/04 20:29:18 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 1.90 2010/08/04 20:29:18 christos Exp $");
35#endif /* not lint && not SCCSID */
36
37#include <sys/types.h>
38#include <sys/stat.h>
39#include <stdio.h>
40#include <dirent.h>
41#include <string.h>
42#include <pwd.h>
43#include <ctype.h>
44#include <stdlib.h>
45#include <unistd.h>
46#include <limits.h>
47#include <errno.h>
48#include <fcntl.h>
49#include <setjmp.h>
50#ifdef HAVE_VIS_H
51#include <vis.h>
52#else
53#include "np/vis.h"
54#endif
55#include "readline/readline.h"
56#include "el.h"
57#include "fcns.h"		/* for EL_NUM_FCNS */
58#include "histedit.h"
59#include "filecomplete.h"
60
61void rl_prep_terminal(int);
62void rl_deprep_terminal(void);
63
64/* for rl_complete() */
65#define TAB		'\r'
66
67/* see comment at the #ifdef for sense of this */
68/* #define GDB_411_HACK */
69
70/* readline compatibility stuff - look at readline sources/documentation */
71/* to see what these variables mean */
72const char *rl_library_version = "EditLine wrapper";
73int rl_readline_version = RL_READLINE_VERSION;
74static char empty[] = { '\0' };
75static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
76static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
77    '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
78char *rl_readline_name = empty;
79FILE *rl_instream = NULL;
80FILE *rl_outstream = NULL;
81int rl_point = 0;
82int rl_end = 0;
83char *rl_line_buffer = NULL;
84VCPFunction *rl_linefunc = NULL;
85int rl_done = 0;
86VFunction *rl_event_hook = NULL;
87KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
88    emacs_meta_keymap,
89    emacs_ctlx_keymap;
90
91int history_base = 1;		/* probably never subject to change */
92int history_length = 0;
93int max_input_history = 0;
94char history_expansion_char = '!';
95char history_subst_char = '^';
96char *history_no_expand_chars = expand_chars;
97Function *history_inhibit_expansion_function = NULL;
98char *history_arg_extract(int start, int end, const char *str);
99
100int rl_inhibit_completion = 0;
101int rl_attempted_completion_over = 0;
102char *rl_basic_word_break_characters = break_chars;
103char *rl_completer_word_break_characters = NULL;
104char *rl_completer_quote_characters = NULL;
105Function *rl_completion_entry_function = NULL;
106CPPFunction *rl_attempted_completion_function = NULL;
107Function *rl_pre_input_hook = NULL;
108Function *rl_startup1_hook = NULL;
109int (*rl_getc_function)(FILE *) = NULL;
110char *rl_terminal_name = NULL;
111int rl_already_prompted = 0;
112int rl_filename_completion_desired = 0;
113int rl_ignore_completion_duplicates = 0;
114int rl_catch_signals = 1;
115int readline_echoing_p = 1;
116int _rl_print_completions_horizontally = 0;
117VFunction *rl_redisplay_function = NULL;
118Function *rl_startup_hook = NULL;
119VFunction *rl_completion_display_matches_hook = NULL;
120VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
121VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
122KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
123
124#ifdef WIDECHAR
125static ct_buffer_t conv;
126#endif
127
128/*
129 * The current prompt string.
130 */
131char *rl_prompt = NULL;
132/*
133 * This is set to character indicating type of completion being done by
134 * rl_complete_internal(); this is available for application completion
135 * functions.
136 */
137int rl_completion_type = 0;
138
139/*
140 * If more than this number of items results from query for possible
141 * completions, we ask user if they are sure to really display the list.
142 */
143int rl_completion_query_items = 100;
144
145/*
146 * List of characters which are word break characters, but should be left
147 * in the parsed text when it is passed to the completion function.
148 * Shell uses this to help determine what kind of completing to do.
149 */
150char *rl_special_prefixes = NULL;
151
152/*
153 * This is the character appended to the completed words if at the end of
154 * the line. Default is ' ' (a space).
155 */
156int rl_completion_append_character = ' ';
157
158/* stuff below is used internally by libedit for readline emulation */
159
160static TYPE(History) *h = NULL;
161static EditLine *e = NULL;
162static Function *map[256];
163static jmp_buf topbuf;
164
165/* internal functions */
166static unsigned char	 _el_rl_complete(EditLine *, int);
167static unsigned char	 _el_rl_tstp(EditLine *, int);
168static char		*_get_prompt(EditLine *);
169static int		 _getc_function(EditLine *, char *);
170static HIST_ENTRY	*_move_history(int);
171static int		 _history_expand_command(const char *, size_t, size_t,
172    char **);
173static char		*_rl_compat_sub(const char *, const char *,
174    const char *, int);
175static int		 _rl_event_read_char(EditLine *, char *);
176static void		 _rl_update_pos(void);
177
178
179/* ARGSUSED */
180static char *
181_get_prompt(EditLine *el __attribute__((__unused__)))
182{
183	rl_already_prompted = 1;
184	return (rl_prompt);
185}
186
187
188/*
189 * generic function for moving around history
190 */
191static HIST_ENTRY *
192_move_history(int op)
193{
194	TYPE(HistEvent) ev;
195	static HIST_ENTRY rl_he;
196
197	if (FUNW(history)(h, &ev, op) != 0)
198		return (HIST_ENTRY *) NULL;
199
200	rl_he.line = ct_encode_string(ev.str, &conv);
201	rl_he.data = NULL;
202
203	return (&rl_he);
204}
205
206
207/*
208 * read one key from user defined input function
209 */
210static int
211/*ARGSUSED*/
212_getc_function(EditLine *el, char *c)
213{
214	int i;
215
216	i = (*rl_getc_function)(NULL);
217	if (i == -1)
218		return 0;
219	*c = i;
220	return 1;
221}
222
223static const char _dothistory[] = "/.history";
224
225static const char *
226_default_history_file(void)
227{
228	struct passwd *p;
229	static char path[PATH_MAX];
230
231	if (*path)
232		return path;
233	if ((p = getpwuid(getuid())) == NULL)
234		return NULL;
235	strlcpy(path, p->pw_dir, PATH_MAX);
236	strlcat(path, _dothistory, PATH_MAX);
237	return path;
238}
239
240/*
241 * READLINE compatibility stuff
242 */
243
244/*
245 * Set the prompt
246 */
247int
248rl_set_prompt(const char *prompt)
249{
250	char *p;
251
252	if (!prompt)
253		prompt = "";
254	if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
255		return 0;
256	if (rl_prompt)
257		free(rl_prompt);
258	rl_prompt = strdup(prompt);
259	if (rl_prompt == NULL)
260		return -1;
261
262	while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
263		*p = RL_PROMPT_START_IGNORE;
264
265	return 0;
266}
267
268/*
269 * initialize rl compat stuff
270 */
271int
272rl_initialize(void)
273{
274	TYPE(HistEvent) ev;
275	const LineInfo *li;
276	int editmode = 1;
277	struct termios t;
278
279	if (e != NULL)
280		el_end(e);
281	if (h != NULL)
282		FUN(history,end)(h);
283
284	if (!rl_instream)
285		rl_instream = stdin;
286	if (!rl_outstream)
287		rl_outstream = stdout;
288
289	/*
290	 * See if we don't really want to run the editor
291	 */
292	if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
293		editmode = 0;
294
295	e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
296
297	if (!editmode)
298		FUN(el,set)(e, EL_EDITMODE, 0);
299
300	h = FUN(history,init)();
301	if (!e || !h)
302		return (-1);
303
304	FUNW(history)(h, &ev, H_SETSIZE, INT_MAX);	/* unlimited */
305	history_length = 0;
306	max_input_history = INT_MAX;
307	el_set(e, EL_HIST, history, h);
308
309	/* setup getc function if valid */
310	if (rl_getc_function)
311		el_set(e, EL_GETCFN, _getc_function);
312
313	/* for proper prompt printing in readline() */
314	if (rl_set_prompt("") == -1) {
315		FUN(history,end)(h);
316		el_end(e);
317		return -1;
318	}
319	el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
320	el_set(e, EL_SIGNAL, rl_catch_signals);
321
322	/* set default mode to "emacs"-style and read setting afterwards */
323	/* so this can be overriden */
324	el_set(e, EL_EDITOR, "emacs");
325	if (rl_terminal_name != NULL)
326		el_set(e, EL_TERMINAL, rl_terminal_name);
327	else
328		el_get(e, EL_TERMINAL, &rl_terminal_name);
329
330	/*
331	 * Word completion - this has to go AFTER rebinding keys
332	 * to emacs-style.
333	 */
334	el_set(e, EL_ADDFN, "rl_complete",
335	    "ReadLine compatible completion function",
336	    _el_rl_complete);
337	el_set(e, EL_BIND, "^I", "rl_complete", NULL);
338
339	/*
340	 * Send TSTP when ^Z is pressed.
341	 */
342	el_set(e, EL_ADDFN, "rl_tstp",
343	    "ReadLine compatible suspend function",
344	    _el_rl_tstp);
345	el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
346
347	/* read settings from configuration file */
348	el_source(e, NULL);
349
350	/*
351	 * Unfortunately, some applications really do use rl_point
352	 * and rl_line_buffer directly.
353	 */
354	li = el_line(e);
355	/* a cheesy way to get rid of const cast. */
356	rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
357	_rl_update_pos();
358
359	if (rl_startup_hook)
360		(*rl_startup_hook)(NULL, 0);
361
362	return (0);
363}
364
365
366/*
367 * read one line from input stream and return it, chomping
368 * trailing newline (if there is any)
369 */
370char *
371readline(const char *p)
372{
373	TYPE(HistEvent) ev;
374	const char * volatile prompt = p;
375	int count;
376	const char *ret;
377	char *buf;
378	static int used_event_hook;
379
380	if (e == NULL || h == NULL)
381		rl_initialize();
382
383	rl_done = 0;
384
385	(void)setjmp(topbuf);
386
387	/* update prompt accordingly to what has been passed */
388	if (rl_set_prompt(prompt) == -1)
389		return NULL;
390
391	if (rl_pre_input_hook)
392		(*rl_pre_input_hook)(NULL, 0);
393
394	if (rl_event_hook && !(e->el_flags&NO_TTY)) {
395		el_set(e, EL_GETCFN, _rl_event_read_char);
396		used_event_hook = 1;
397	}
398
399	if (!rl_event_hook && used_event_hook) {
400		el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
401		used_event_hook = 0;
402	}
403
404	rl_already_prompted = 0;
405
406	/* get one line from input stream */
407	ret = el_gets(e, &count);
408
409	if (ret && count > 0) {
410		int lastidx;
411
412		buf = strdup(ret);
413		if (buf == NULL)
414			return NULL;
415		lastidx = count - 1;
416		if (buf[lastidx] == '\n')
417			buf[lastidx] = '\0';
418	} else
419		buf = NULL;
420
421	FUNW(history)(h, &ev, H_GETSIZE);
422	history_length = ev.num;
423
424	return buf;
425}
426
427/*
428 * history functions
429 */
430
431/*
432 * is normally called before application starts to use
433 * history expansion functions
434 */
435void
436using_history(void)
437{
438	if (h == NULL || e == NULL)
439		rl_initialize();
440}
441
442
443/*
444 * substitute ``what'' with ``with'', returning resulting string; if
445 * globally == 1, substitutes all occurrences of what, otherwise only the
446 * first one
447 */
448static char *
449_rl_compat_sub(const char *str, const char *what, const char *with,
450    int globally)
451{
452	const	char	*s;
453	char	*r, *result;
454	size_t	len, with_len, what_len;
455
456	len = strlen(str);
457	with_len = strlen(with);
458	what_len = strlen(what);
459
460	/* calculate length we need for result */
461	s = str;
462	while (*s) {
463		if (*s == *what && !strncmp(s, what, what_len)) {
464			len += with_len - what_len;
465			if (!globally)
466				break;
467			s += what_len;
468		} else
469			s++;
470	}
471	r = result = malloc(len + 1);
472	if (result == NULL)
473		return NULL;
474	s = str;
475	while (*s) {
476		if (*s == *what && !strncmp(s, what, what_len)) {
477			(void)strncpy(r, with, with_len);
478			r += with_len;
479			s += what_len;
480			if (!globally) {
481				(void)strcpy(r, s);
482				return(result);
483			}
484		} else
485			*r++ = *s++;
486	}
487	*r = '\0';
488	return(result);
489}
490
491static	char	*last_search_pat;	/* last !?pat[?] search pattern */
492static	char	*last_search_match;	/* last !?pat[?] that matched */
493
494const char *
495get_history_event(const char *cmd, int *cindex, int qchar)
496{
497	int idx, sign, sub, num, begin, ret;
498	size_t len;
499	char	*pat;
500	const char *rptr;
501	TYPE(HistEvent) ev;
502
503	idx = *cindex;
504	if (cmd[idx++] != history_expansion_char)
505		return(NULL);
506
507	/* find out which event to take */
508	if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
509		if (FUNW(history)(h, &ev, H_FIRST) != 0)
510			return(NULL);
511		*cindex = cmd[idx]? (idx + 1):idx;
512		return ct_encode_string(ev.str, &conv);
513	}
514	sign = 0;
515	if (cmd[idx] == '-') {
516		sign = 1;
517		idx++;
518	}
519
520	if ('0' <= cmd[idx] && cmd[idx] <= '9') {
521		HIST_ENTRY *rl_he;
522
523		num = 0;
524		while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
525			num = num * 10 + cmd[idx] - '0';
526			idx++;
527		}
528		if (sign)
529			num = history_length - num + 1;
530
531		if (!(rl_he = history_get(num)))
532			return(NULL);
533
534		*cindex = idx;
535		return(rl_he->line);
536	}
537	sub = 0;
538	if (cmd[idx] == '?') {
539		sub = 1;
540		idx++;
541	}
542	begin = idx;
543	while (cmd[idx]) {
544		if (cmd[idx] == '\n')
545			break;
546		if (sub && cmd[idx] == '?')
547			break;
548		if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
549				    || cmd[idx] == '\t' || cmd[idx] == qchar))
550			break;
551		idx++;
552	}
553	len = idx - begin;
554	if (sub && cmd[idx] == '?')
555		idx++;
556	if (sub && len == 0 && last_search_pat && *last_search_pat)
557		pat = last_search_pat;
558	else if (len == 0)
559		return(NULL);
560	else {
561		if ((pat = malloc(len + 1)) == NULL)
562			return NULL;
563		(void)strncpy(pat, cmd + begin, len);
564		pat[len] = '\0';
565	}
566
567	if (FUNW(history)(h, &ev, H_CURR) != 0) {
568		if (pat != last_search_pat)
569			free(pat);
570		return (NULL);
571	}
572	num = ev.num;
573
574	if (sub) {
575		if (pat != last_search_pat) {
576			if (last_search_pat)
577				free(last_search_pat);
578			last_search_pat = pat;
579		}
580		ret = history_search(pat, -1);
581	} else
582		ret = history_search_prefix(pat, -1);
583
584	if (ret == -1) {
585		/* restore to end of list on failed search */
586		FUNW(history)(h, &ev, H_FIRST);
587		(void)fprintf(rl_outstream, "%s: Event not found\n", pat);
588		if (pat != last_search_pat)
589			free(pat);
590		return(NULL);
591	}
592
593	if (sub && len) {
594		if (last_search_match && last_search_match != pat)
595			free(last_search_match);
596		last_search_match = pat;
597	}
598
599	if (pat != last_search_pat)
600		free(pat);
601
602	if (FUNW(history)(h, &ev, H_CURR) != 0)
603		return(NULL);
604	*cindex = idx;
605	rptr = ct_encode_string(ev.str, &conv);
606
607	/* roll back to original position */
608	(void)FUNW(history)(h, &ev, H_SET, num);
609
610	return rptr;
611}
612
613/*
614 * the real function doing history expansion - takes as argument command
615 * to do and data upon which the command should be executed
616 * does expansion the way I've understood readline documentation
617 *
618 * returns 0 if data was not modified, 1 if it was and 2 if the string
619 * should be only printed and not executed; in case of error,
620 * returns -1 and *result points to NULL
621 * it's callers responsibility to free() string returned in *result
622 */
623static int
624_history_expand_command(const char *command, size_t offs, size_t cmdlen,
625    char **result)
626{
627	char *tmp, *search = NULL, *aptr;
628	const char *ptr, *cmd;
629	static char *from = NULL, *to = NULL;
630	int start, end, idx, has_mods = 0;
631	int p_on = 0, g_on = 0;
632
633	*result = NULL;
634	aptr = NULL;
635	ptr = NULL;
636
637	/* First get event specifier */
638	idx = 0;
639
640	if (strchr(":^*$", command[offs + 1])) {
641		char str[4];
642		/*
643		* "!:" is shorthand for "!!:".
644		* "!^", "!*" and "!$" are shorthand for
645		* "!!:^", "!!:*" and "!!:$" respectively.
646		*/
647		str[0] = str[1] = '!';
648		str[2] = '0';
649		ptr = get_history_event(str, &idx, 0);
650		idx = (command[offs + 1] == ':')? 1:0;
651		has_mods = 1;
652	} else {
653		if (command[offs + 1] == '#') {
654			/* use command so far */
655			if ((aptr = malloc(offs + 1)) == NULL)
656				return -1;
657			(void)strncpy(aptr, command, offs);
658			aptr[offs] = '\0';
659			idx = 1;
660		} else {
661			int	qchar;
662
663			qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
664			ptr = get_history_event(command + offs, &idx, qchar);
665		}
666		has_mods = command[offs + idx] == ':';
667	}
668
669	if (ptr == NULL && aptr == NULL)
670		return(-1);
671
672	if (!has_mods) {
673		*result = strdup(aptr ? aptr : ptr);
674		if (aptr)
675			free(aptr);
676		if (*result == NULL)
677			return -1;
678		return(1);
679	}
680
681	cmd = command + offs + idx + 1;
682
683	/* Now parse any word designators */
684
685	if (*cmd == '%')	/* last word matched by ?pat? */
686		tmp = strdup(last_search_match? last_search_match:"");
687	else if (strchr("^*$-0123456789", *cmd)) {
688		start = end = -1;
689		if (*cmd == '^')
690			start = end = 1, cmd++;
691		else if (*cmd == '$')
692			start = -1, cmd++;
693		else if (*cmd == '*')
694			start = 1, cmd++;
695	       else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
696			start = 0;
697			while (*cmd && '0' <= *cmd && *cmd <= '9')
698				start = start * 10 + *cmd++ - '0';
699
700			if (*cmd == '-') {
701				if (isdigit((unsigned char) cmd[1])) {
702					cmd++;
703					end = 0;
704					while (*cmd && '0' <= *cmd && *cmd <= '9')
705						end = end * 10 + *cmd++ - '0';
706				} else if (cmd[1] == '$') {
707					cmd += 2;
708					end = -1;
709				} else {
710					cmd++;
711					end = -2;
712				}
713			} else if (*cmd == '*')
714				end = -1, cmd++;
715			else
716				end = start;
717		}
718		tmp = history_arg_extract(start, end, aptr? aptr:ptr);
719		if (tmp == NULL) {
720			(void)fprintf(rl_outstream, "%s: Bad word specifier",
721			    command + offs + idx);
722			if (aptr)
723				free(aptr);
724			return(-1);
725		}
726	} else
727		tmp = strdup(aptr? aptr:ptr);
728
729	if (aptr)
730		free(aptr);
731
732	if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
733		*result = tmp;
734		return(1);
735	}
736
737	for (; *cmd; cmd++) {
738		if (*cmd == ':')
739			continue;
740		else if (*cmd == 'h') {		/* remove trailing path */
741			if ((aptr = strrchr(tmp, '/')) != NULL)
742				*aptr = '\0';
743		} else if (*cmd == 't') {	/* remove leading path */
744			if ((aptr = strrchr(tmp, '/')) != NULL) {
745				aptr = strdup(aptr + 1);
746				free(tmp);
747				tmp = aptr;
748			}
749		} else if (*cmd == 'r') {	/* remove trailing suffix */
750			if ((aptr = strrchr(tmp, '.')) != NULL)
751				*aptr = '\0';
752		} else if (*cmd == 'e') {	/* remove all but suffix */
753			if ((aptr = strrchr(tmp, '.')) != NULL) {
754				aptr = strdup(aptr);
755				free(tmp);
756				tmp = aptr;
757			}
758		} else if (*cmd == 'p')		/* print only */
759			p_on = 1;
760		else if (*cmd == 'g')
761			g_on = 2;
762		else if (*cmd == 's' || *cmd == '&') {
763			char *what, *with, delim;
764			size_t len, from_len;
765			size_t size;
766
767			if (*cmd == '&' && (from == NULL || to == NULL))
768				continue;
769			else if (*cmd == 's') {
770				delim = *(++cmd), cmd++;
771				size = 16;
772				what = realloc(from, size);
773				if (what == NULL) {
774					free(from);
775					free(tmp);
776					return 0;
777				}
778				len = 0;
779				for (; *cmd && *cmd != delim; cmd++) {
780					if (*cmd == '\\' && cmd[1] == delim)
781						cmd++;
782					if (len >= size) {
783						char *nwhat;
784						nwhat = realloc(what,
785								(size <<= 1));
786						if (nwhat == NULL) {
787							free(what);
788							free(tmp);
789							return 0;
790						}
791						what = nwhat;
792					}
793					what[len++] = *cmd;
794				}
795				what[len] = '\0';
796				from = what;
797				if (*what == '\0') {
798					free(what);
799					if (search) {
800						from = strdup(search);
801						if (from == NULL) {
802							free(tmp);
803							return 0;
804						}
805					} else {
806						from = NULL;
807						free(tmp);
808						return (-1);
809					}
810				}
811				cmd++;	/* shift after delim */
812				if (!*cmd)
813					continue;
814
815				size = 16;
816				with = realloc(to, size);
817				if (with == NULL) {
818					free(to);
819					free(tmp);
820					return -1;
821				}
822				len = 0;
823				from_len = strlen(from);
824				for (; *cmd && *cmd != delim; cmd++) {
825					if (len + from_len + 1 >= size) {
826						char *nwith;
827						size += from_len + 1;
828						nwith = realloc(with, size);
829						if (nwith == NULL) {
830							free(with);
831							free(tmp);
832							return -1;
833						}
834						with = nwith;
835					}
836					if (*cmd == '&') {
837						/* safe */
838						(void)strcpy(&with[len], from);
839						len += from_len;
840						continue;
841					}
842					if (*cmd == '\\'
843					    && (*(cmd + 1) == delim
844						|| *(cmd + 1) == '&'))
845						cmd++;
846					with[len++] = *cmd;
847				}
848				with[len] = '\0';
849				to = with;
850			}
851
852			aptr = _rl_compat_sub(tmp, from, to, g_on);
853			if (aptr) {
854				free(tmp);
855				tmp = aptr;
856			}
857			g_on = 0;
858		}
859	}
860	*result = tmp;
861	return (p_on? 2:1);
862}
863
864
865/*
866 * csh-style history expansion
867 */
868int
869history_expand(char *str, char **output)
870{
871	int ret = 0;
872	size_t idx, i, size;
873	char *tmp, *result;
874
875	if (h == NULL || e == NULL)
876		rl_initialize();
877
878	if (history_expansion_char == 0) {
879		*output = strdup(str);
880		return(0);
881	}
882
883	*output = NULL;
884	if (str[0] == history_subst_char) {
885		/* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
886		*output = malloc(strlen(str) + 4 + 1);
887		if (*output == NULL)
888			return 0;
889		(*output)[0] = (*output)[1] = history_expansion_char;
890		(*output)[2] = ':';
891		(*output)[3] = 's';
892		(void)strcpy((*output) + 4, str);
893		str = *output;
894	} else {
895		*output = strdup(str);
896		if (*output == NULL)
897			return 0;
898	}
899
900#define ADD_STRING(what, len, fr)					\
901	{								\
902		if (idx + len + 1 > size) {				\
903			char *nresult = realloc(result, (size += len + 1));\
904			if (nresult == NULL) {				\
905				free(*output);				\
906				if (/*CONSTCOND*/fr)			\
907					free(tmp);			\
908				return 0;				\
909			}						\
910			result = nresult;				\
911		}							\
912		(void)strncpy(&result[idx], what, len);			\
913		idx += len;						\
914		result[idx] = '\0';					\
915	}
916
917	result = NULL;
918	size = idx = 0;
919	tmp = NULL;
920	for (i = 0; str[i];) {
921		int qchar, loop_again;
922		size_t len, start, j;
923
924		qchar = 0;
925		loop_again = 1;
926		start = j = i;
927loop:
928		for (; str[j]; j++) {
929			if (str[j] == '\\' &&
930			    str[j + 1] == history_expansion_char) {
931				(void)strcpy(&str[j], &str[j + 1]);
932				continue;
933			}
934			if (!loop_again) {
935				if (isspace((unsigned char) str[j])
936				    || str[j] == qchar)
937					break;
938			}
939			if (str[j] == history_expansion_char
940			    && !strchr(history_no_expand_chars, str[j + 1])
941			    && (!history_inhibit_expansion_function ||
942			    (*history_inhibit_expansion_function)(str,
943			    (int)j) == 0))
944				break;
945		}
946
947		if (str[j] && loop_again) {
948			i = j;
949			qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
950			j++;
951			if (str[j] == history_expansion_char)
952				j++;
953			loop_again = 0;
954			goto loop;
955		}
956		len = i - start;
957		ADD_STRING(&str[start], len, 0);
958
959		if (str[i] == '\0' || str[i] != history_expansion_char) {
960			len = j - i;
961			ADD_STRING(&str[i], len, 0);
962			if (start == 0)
963				ret = 0;
964			else
965				ret = 1;
966			break;
967		}
968		ret = _history_expand_command (str, i, (j - i), &tmp);
969		if (ret > 0 && tmp) {
970			len = strlen(tmp);
971			ADD_STRING(tmp, len, 1);
972		}
973		if (tmp) {
974			free(tmp);
975			tmp = NULL;
976		}
977		i = j;
978	}
979
980	/* ret is 2 for "print only" option */
981	if (ret == 2) {
982		add_history(result);
983#ifdef GDB_411_HACK
984		/* gdb 4.11 has been shipped with readline, where */
985		/* history_expand() returned -1 when the line	  */
986		/* should not be executed; in readline 2.1+	  */
987		/* it should return 2 in such a case		  */
988		ret = -1;
989#endif
990	}
991	free(*output);
992	*output = result;
993
994	return (ret);
995}
996
997/*
998* Return a string consisting of arguments of "str" from "start" to "end".
999*/
1000char *
1001history_arg_extract(int start, int end, const char *str)
1002{
1003	size_t  i, len, max;
1004	char	**arr, *result = NULL;
1005
1006	arr = history_tokenize(str);
1007	if (!arr)
1008		return NULL;
1009	if (arr && *arr == NULL)
1010		goto out;
1011
1012	for (max = 0; arr[max]; max++)
1013		continue;
1014	max--;
1015
1016	if (start == '$')
1017		start = (int)max;
1018	if (end == '$')
1019		end = (int)max;
1020	if (end < 0)
1021		end = (int)max + end + 1;
1022	if (start < 0)
1023		start = end;
1024
1025	if (start < 0 || end < 0 || (size_t)start > max ||
1026	    (size_t)end > max || start > end)
1027		goto out;
1028
1029	for (i = start, len = 0; i <= (size_t)end; i++)
1030		len += strlen(arr[i]) + 1;
1031	len++;
1032	result = malloc(len);
1033	if (result == NULL)
1034		goto out;
1035
1036	for (i = start, len = 0; i <= (size_t)end; i++) {
1037		(void)strcpy(result + len, arr[i]);
1038		len += strlen(arr[i]);
1039		if (i < (size_t)end)
1040			result[len++] = ' ';
1041	}
1042	result[len] = '\0';
1043
1044out:
1045	for (i = 0; arr[i]; i++)
1046		free(arr[i]);
1047	free(arr);
1048
1049	return result;
1050}
1051
1052/*
1053 * Parse the string into individual tokens,
1054 * similar to how shell would do it.
1055 */
1056char **
1057history_tokenize(const char *str)
1058{
1059	int size = 1, idx = 0, i, start;
1060	size_t len;
1061	char **result = NULL, *temp, delim = '\0';
1062
1063	for (i = 0; str[i];) {
1064		while (isspace((unsigned char) str[i]))
1065			i++;
1066		start = i;
1067		for (; str[i];) {
1068			if (str[i] == '\\') {
1069				if (str[i+1] != '\0')
1070					i++;
1071			} else if (str[i] == delim)
1072				delim = '\0';
1073			else if (!delim &&
1074				    (isspace((unsigned char) str[i]) ||
1075				strchr("()<>;&|$", str[i])))
1076				break;
1077			else if (!delim && strchr("'`\"", str[i]))
1078				delim = str[i];
1079			if (str[i])
1080				i++;
1081		}
1082
1083		if (idx + 2 >= size) {
1084			char **nresult;
1085			size <<= 1;
1086			nresult = realloc(result, size * sizeof(char *));
1087			if (nresult == NULL) {
1088				free(result);
1089				return NULL;
1090			}
1091			result = nresult;
1092		}
1093		len = i - start;
1094		temp = malloc(len + 1);
1095		if (temp == NULL) {
1096			for (i = 0; i < idx; i++)
1097				free(result[i]);
1098			free(result);
1099			return NULL;
1100		}
1101		(void)strncpy(temp, &str[start], len);
1102		temp[len] = '\0';
1103		result[idx++] = temp;
1104		result[idx] = NULL;
1105		if (str[i])
1106			i++;
1107	}
1108	return (result);
1109}
1110
1111
1112/*
1113 * limit size of history record to ``max'' events
1114 */
1115void
1116stifle_history(int max)
1117{
1118	TYPE(HistEvent) ev;
1119
1120	if (h == NULL || e == NULL)
1121		rl_initialize();
1122
1123	if (FUNW(history)(h, &ev, H_SETSIZE, max) == 0)
1124		max_input_history = max;
1125}
1126
1127
1128/*
1129 * "unlimit" size of history - set the limit to maximum allowed int value
1130 */
1131int
1132unstifle_history(void)
1133{
1134	TYPE(HistEvent) ev;
1135	int omax;
1136
1137	FUNW(history)(h, &ev, H_SETSIZE, INT_MAX);
1138	omax = max_input_history;
1139	max_input_history = INT_MAX;
1140	return (omax);		/* some value _must_ be returned */
1141}
1142
1143
1144int
1145history_is_stifled(void)
1146{
1147
1148	/* cannot return true answer */
1149	return (max_input_history != INT_MAX);
1150}
1151
1152static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1153
1154int
1155history_truncate_file (const char *filename, int nlines)
1156{
1157	int ret = 0;
1158	FILE *fp, *tp;
1159	char template[sizeof(_history_tmp_template)];
1160	char buf[4096];
1161	int fd;
1162	char *cp;
1163	off_t off;
1164	int count = 0;
1165	ssize_t left = 0;
1166
1167	if (filename == NULL && (filename = _default_history_file()) == NULL)
1168		return errno;
1169	if ((fp = fopen(filename, "r+")) == NULL)
1170		return errno;
1171	strcpy(template, _history_tmp_template);
1172	if ((fd = mkstemp(template)) == -1) {
1173		ret = errno;
1174		goto out1;
1175	}
1176
1177	if ((tp = fdopen(fd, "r+")) == NULL) {
1178		close(fd);
1179		ret = errno;
1180		goto out2;
1181	}
1182
1183	for(;;) {
1184		if (fread(buf, sizeof(buf), 1, fp) != 1) {
1185			if (ferror(fp)) {
1186				ret = errno;
1187				break;
1188			}
1189			if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1190			    (off_t)-1) {
1191				ret = errno;
1192				break;
1193			}
1194			left = fread(buf, 1, sizeof(buf), fp);
1195			if (ferror(fp)) {
1196				ret = errno;
1197				break;
1198			}
1199			if (left == 0) {
1200				count--;
1201				left = sizeof(buf);
1202			} else if (fwrite(buf, (size_t)left, 1, tp) != 1) {
1203				ret = errno;
1204				break;
1205			}
1206			fflush(tp);
1207			break;
1208		}
1209		if (fwrite(buf, sizeof(buf), 1, tp) != 1) {
1210			ret = errno;
1211			break;
1212		}
1213		count++;
1214	}
1215	if (ret)
1216		goto out3;
1217	cp = buf + left - 1;
1218	if(*cp != '\n')
1219		cp++;
1220	for(;;) {
1221		while (--cp >= buf) {
1222			if (*cp == '\n') {
1223				if (--nlines == 0) {
1224					if (++cp >= buf + sizeof(buf)) {
1225						count++;
1226						cp = buf;
1227					}
1228					break;
1229				}
1230			}
1231		}
1232		if (nlines <= 0 || count == 0)
1233			break;
1234		count--;
1235		if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1236			ret = errno;
1237			break;
1238		}
1239		if (fread(buf, sizeof(buf), 1, tp) != 1) {
1240			if (ferror(tp)) {
1241				ret = errno;
1242				break;
1243			}
1244			ret = EAGAIN;
1245			break;
1246		}
1247		cp = buf + sizeof(buf);
1248	}
1249
1250	if (ret || nlines > 0)
1251		goto out3;
1252
1253	if (fseeko(fp, 0, SEEK_SET) == (off_t)-1) {
1254		ret = errno;
1255		goto out3;
1256	}
1257
1258	if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1259	    (off_t)-1) {
1260		ret = errno;
1261		goto out3;
1262	}
1263
1264	for(;;) {
1265		if ((left = fread(buf, 1, sizeof(buf), tp)) == 0) {
1266			if (ferror(fp))
1267				ret = errno;
1268			break;
1269		}
1270		if (fwrite(buf, (size_t)left, 1, fp) != 1) {
1271			ret = errno;
1272			break;
1273		}
1274	}
1275	fflush(fp);
1276	if((off = ftello(fp)) > 0)
1277		(void)ftruncate(fileno(fp), off);
1278out3:
1279	fclose(tp);
1280out2:
1281	unlink(template);
1282out1:
1283	fclose(fp);
1284
1285	return ret;
1286}
1287
1288
1289/*
1290 * read history from a file given
1291 */
1292int
1293read_history(const char *filename)
1294{
1295	TYPE(HistEvent) ev;
1296
1297	if (h == NULL || e == NULL)
1298		rl_initialize();
1299	if (filename == NULL && (filename = _default_history_file()) == NULL)
1300		return errno;
1301	return (FUNW(history)(h, &ev, H_LOAD, filename) == -1 ?
1302	    (errno ? errno : EINVAL) : 0);
1303}
1304
1305
1306/*
1307 * write history to a file given
1308 */
1309int
1310write_history(const char *filename)
1311{
1312	TYPE(HistEvent) ev;
1313
1314	if (h == NULL || e == NULL)
1315		rl_initialize();
1316	if (filename == NULL && (filename = _default_history_file()) == NULL)
1317		return errno;
1318	return (FUNW(history)(h, &ev, H_SAVE, filename) == -1 ?
1319	    (errno ? errno : EINVAL) : 0);
1320}
1321
1322
1323/*
1324 * returns history ``num''th event
1325 *
1326 * returned pointer points to static variable
1327 */
1328HIST_ENTRY *
1329history_get(int num)
1330{
1331	static HIST_ENTRY she;
1332	TYPE(HistEvent) ev;
1333	int curr_num;
1334
1335	if (h == NULL || e == NULL)
1336		rl_initialize();
1337
1338	/* save current position */
1339	if (FUNW(history)(h, &ev, H_CURR) != 0)
1340		return (NULL);
1341	curr_num = ev.num;
1342
1343	/* start from the oldest */
1344	if (FUNW(history)(h, &ev, H_LAST) != 0)
1345		return (NULL);	/* error */
1346
1347	/* look forwards for event matching specified offset */
1348	if (FUNW(history)(h, &ev, H_NEXT_EVDATA, num, &she.data))
1349		return (NULL);
1350
1351	she.line = ct_encode_string(ev.str, &conv);
1352
1353	/* restore pointer to where it was */
1354	(void)FUNW(history)(h, &ev, H_SET, curr_num);
1355
1356	return (&she);
1357}
1358
1359
1360/*
1361 * add the line to history table
1362 */
1363int
1364add_history(const char *line)
1365{
1366	TYPE(HistEvent) ev;
1367	const Char *wline;
1368
1369	if (h == NULL || e == NULL)
1370		rl_initialize();
1371
1372	wline = ct_decode_string(line, &conv);
1373
1374	(void)FUNW(history)(h, &ev, H_ENTER, wline);
1375	if (FUNW(history)(h, &ev, H_GETSIZE) == 0)
1376		history_length = ev.num;
1377
1378	return (!(history_length > 0)); /* return 0 if all is okay */
1379}
1380
1381
1382/*
1383 * remove the specified entry from the history list and return it.
1384 */
1385HIST_ENTRY *
1386remove_history(int num)
1387{
1388	HIST_ENTRY *he;
1389	TYPE(HistEvent) ev;
1390
1391	if (h == NULL || e == NULL)
1392		rl_initialize();
1393
1394	if ((he = malloc(sizeof(*he))) == NULL)
1395		return NULL;
1396
1397	if (FUNW(history)(h, &ev, H_DELDATA, num, &he->data) != 0) {
1398		free(he);
1399		return NULL;
1400	}
1401
1402	he->line = ct_encode_string(ev.str, &conv);
1403	if (FUNW(history)(h, &ev, H_GETSIZE) == 0)
1404		history_length = ev.num;
1405
1406	return he;
1407}
1408
1409
1410/*
1411 * replace the line and data of the num-th entry
1412 */
1413HIST_ENTRY *
1414replace_history_entry(int num, const char *line, histdata_t data)
1415{
1416	HIST_ENTRY *he;
1417	TYPE(HistEvent) ev;
1418	int curr_num;
1419
1420	if (h == NULL || e == NULL)
1421		rl_initialize();
1422
1423	/* save current position */
1424	if (FUNW(history)(h, &ev, H_CURR) != 0)
1425		return NULL;
1426	curr_num = ev.num;
1427
1428	/* start from the oldest */
1429	if (FUNW(history)(h, &ev, H_LAST) != 0)
1430		return NULL;	/* error */
1431
1432	if ((he = malloc(sizeof(*he))) == NULL)
1433		return NULL;
1434
1435	/* look forwards for event matching specified offset */
1436	if (FUNW(history)(h, &ev, H_NEXT_EVDATA, num, &he->data))
1437		goto out;
1438
1439	he->line = strdup(ct_encode_string(ev.str, &e->el_scratch));
1440	if (he->line == NULL)
1441		goto out;
1442
1443	if (FUNW(history)(h, &ev, H_REPLACE, line, data))
1444		goto out;
1445
1446	/* restore pointer to where it was */
1447	if (FUNW(history)(h, &ev, H_SET, curr_num))
1448		goto out;
1449
1450	return he;
1451out:
1452	free(he);
1453	return NULL;
1454}
1455
1456/*
1457 * clear the history list - delete all entries
1458 */
1459void
1460clear_history(void)
1461{
1462	TYPE(HistEvent) ev;
1463
1464	(void)FUNW(history)(h, &ev, H_CLEAR);
1465	history_length = 0;
1466}
1467
1468
1469/*
1470 * returns offset of the current history event
1471 */
1472int
1473where_history(void)
1474{
1475	TYPE(HistEvent) ev;
1476	int curr_num, off;
1477
1478	if (FUNW(history)(h, &ev, H_CURR) != 0)
1479		return (0);
1480	curr_num = ev.num;
1481
1482	(void)FUNW(history)(h, &ev, H_FIRST);
1483	off = 1;
1484	while (ev.num != curr_num && FUNW(history)(h, &ev, H_NEXT) == 0)
1485		off++;
1486
1487	return (off);
1488}
1489
1490
1491/*
1492 * returns current history event or NULL if there is no such event
1493 */
1494HIST_ENTRY *
1495current_history(void)
1496{
1497
1498	return (_move_history(H_CURR));
1499}
1500
1501
1502/*
1503 * returns total number of bytes history events' data are using
1504 */
1505int
1506history_total_bytes(void)
1507{
1508	TYPE(HistEvent) ev;
1509	int curr_num;
1510	size_t size;
1511
1512	if (FUNW(history)(h, &ev, H_CURR) != 0)
1513		return (-1);
1514	curr_num = ev.num;
1515
1516	(void)FUNW(history)(h, &ev, H_FIRST);
1517	size = 0;
1518	do
1519		size += Strlen(ev.str) * sizeof(*ev.str);
1520	while (FUNW(history)(h, &ev, H_NEXT) == 0);
1521
1522	/* get to the same position as before */
1523	FUNW(history)(h, &ev, H_PREV_EVENT, curr_num);
1524
1525	return (int)(size);
1526}
1527
1528
1529/*
1530 * sets the position in the history list to ``pos''
1531 */
1532int
1533history_set_pos(int pos)
1534{
1535	TYPE(HistEvent) ev;
1536	int curr_num;
1537
1538	if (pos >= history_length || pos < 0)
1539		return (-1);
1540
1541	(void)FUNW(history)(h, &ev, H_CURR);
1542	curr_num = ev.num;
1543
1544	/*
1545	 * use H_DELDATA to set to nth history (without delete) by passing
1546	 * (void **)-1
1547	 */
1548	if (FUNW(history)(h, &ev, H_DELDATA, pos, (void **)-1)) {
1549		(void)FUNW(history)(h, &ev, H_SET, curr_num);
1550		return(-1);
1551	}
1552	return (0);
1553}
1554
1555
1556/*
1557 * returns previous event in history and shifts pointer accordingly
1558 */
1559HIST_ENTRY *
1560previous_history(void)
1561{
1562
1563	return (_move_history(H_PREV));
1564}
1565
1566
1567/*
1568 * returns next event in history and shifts pointer accordingly
1569 */
1570HIST_ENTRY *
1571next_history(void)
1572{
1573
1574	return (_move_history(H_NEXT));
1575}
1576
1577
1578/*
1579 * searches for first history event containing the str
1580 */
1581int
1582history_search(const char *str, int direction)
1583{
1584	TYPE(HistEvent) ev;
1585	const Char *strp;
1586	const Char *wstr;
1587	int curr_num;
1588
1589	if (FUNW(history)(h, &ev, H_CURR) != 0)
1590		return (-1);
1591	curr_num = ev.num;
1592
1593	wstr = ct_decode_string(str, &conv);
1594	for (;;) {
1595		if ((strp = Strstr(ev.str, wstr)) != NULL)
1596			return (int) (strp - ev.str);
1597		if (FUNW(history)(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1598			break;
1599	}
1600	(void)FUNW(history)(h, &ev, H_SET, curr_num);
1601	return (-1);
1602}
1603
1604
1605/*
1606 * searches for first history event beginning with str
1607 */
1608int
1609history_search_prefix(const char *str, int direction)
1610{
1611	TYPE(HistEvent) ev;
1612
1613	return (FUNW(history)(h, &ev, direction < 0 ?
1614	    H_PREV_STR : H_NEXT_STR, str));
1615}
1616
1617
1618/*
1619 * search for event in history containing str, starting at offset
1620 * abs(pos); continue backward, if pos<0, forward otherwise
1621 */
1622/* ARGSUSED */
1623int
1624history_search_pos(const char *str,
1625		   int direction __attribute__((__unused__)), int pos)
1626{
1627	TYPE(HistEvent) ev;
1628	int curr_num, off;
1629	const Char *wstr;
1630
1631	off = (pos > 0) ? pos : -pos;
1632	pos = (pos > 0) ? 1 : -1;
1633
1634	if (FUNW(history)(h, &ev, H_CURR) != 0)
1635		return (-1);
1636	curr_num = ev.num;
1637
1638	if (history_set_pos(off) != 0 || FUNW(history)(h, &ev, H_CURR) != 0)
1639		return (-1);
1640
1641	wstr = ct_decode_string(str, &conv);
1642	for (;;) {
1643		if (Strstr(ev.str, wstr))
1644			return (off);
1645		if (FUNW(history)(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1646			break;
1647	}
1648
1649	/* set "current" pointer back to previous state */
1650	(void)FUNW(history)(h, &ev,
1651	    pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1652
1653	return (-1);
1654}
1655
1656
1657/********************************/
1658/* completion functions */
1659
1660char *
1661tilde_expand(char *name)
1662{
1663	return fn_tilde_expand(name);
1664}
1665
1666char *
1667filename_completion_function(const char *name, int state)
1668{
1669	return fn_filename_completion_function(name, state);
1670}
1671
1672/*
1673 * a completion generator for usernames; returns _first_ username
1674 * which starts with supplied text
1675 * text contains a partial username preceded by random character
1676 * (usually '~'); state is ignored
1677 * it's callers responsibility to free returned value
1678 */
1679char *
1680username_completion_function(const char *text, int state)
1681{
1682	struct passwd *pwd, pwres;
1683	char pwbuf[1024];
1684
1685	if (text[0] == '\0')
1686		return (NULL);
1687
1688	if (*text == '~')
1689		text++;
1690
1691	if (state == 0)
1692		setpwent();
1693
1694	while (getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pwd) == 0
1695	    && pwd != NULL && text[0] == pwd->pw_name[0]
1696	    && strcmp(text, pwd->pw_name) == 0);
1697
1698	if (pwd == NULL) {
1699		endpwent();
1700		return NULL;
1701	}
1702	return strdup(pwd->pw_name);
1703}
1704
1705
1706/*
1707 * el-compatible wrapper to send TSTP on ^Z
1708 */
1709/* ARGSUSED */
1710static unsigned char
1711_el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1712{
1713	(void)kill(0, SIGTSTP);
1714	return CC_NORM;
1715}
1716
1717/*
1718 * Display list of strings in columnar format on readline's output stream.
1719 * 'matches' is list of strings, 'len' is number of strings in 'matches',
1720 * 'max' is maximum length of string in 'matches'.
1721 */
1722void
1723rl_display_match_list(char **matches, int len, int max)
1724{
1725
1726	fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1727}
1728
1729static const char *
1730/*ARGSUSED*/
1731_rl_completion_append_character_function(const char *dummy
1732    __attribute__((__unused__)))
1733{
1734	static char buf[2];
1735	buf[0] = rl_completion_append_character;
1736	buf[1] = '\0';
1737	return buf;
1738}
1739
1740
1741/*
1742 * complete word at current point
1743 */
1744/* ARGSUSED */
1745int
1746rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1747{
1748#ifdef WIDECHAR
1749	static ct_buffer_t wbreak_conv, sprefix_conv;
1750#endif
1751
1752	if (h == NULL || e == NULL)
1753		rl_initialize();
1754
1755	if (rl_inhibit_completion) {
1756		char arr[2];
1757		arr[0] = (char)invoking_key;
1758		arr[1] = '\0';
1759		el_insertstr(e, arr);
1760		return (CC_REFRESH);
1761	}
1762
1763	/* Just look at how many global variables modify this operation! */
1764	return fn_complete(e,
1765	    (CPFunction *)rl_completion_entry_function,
1766	    rl_attempted_completion_function,
1767	    ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1768	    ct_decode_string(rl_special_prefixes, &sprefix_conv),
1769	    _rl_completion_append_character_function,
1770	    (size_t)rl_completion_query_items,
1771	    &rl_completion_type, &rl_attempted_completion_over,
1772	    &rl_point, &rl_end);
1773}
1774
1775
1776/* ARGSUSED */
1777static unsigned char
1778_el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1779{
1780	return (unsigned char)rl_complete(0, ch);
1781}
1782
1783/*
1784 * misc other functions
1785 */
1786
1787/*
1788 * bind key c to readline-type function func
1789 */
1790int
1791rl_bind_key(int c, rl_command_func_t *func)
1792{
1793	int retval = -1;
1794
1795	if (h == NULL || e == NULL)
1796		rl_initialize();
1797
1798	if (func == rl_insert) {
1799		/* XXX notice there is no range checking of ``c'' */
1800		e->el_map.key[c] = ED_INSERT;
1801		retval = 0;
1802	}
1803	return (retval);
1804}
1805
1806
1807/*
1808 * read one key from input - handles chars pushed back
1809 * to input stream also
1810 */
1811int
1812rl_read_key(void)
1813{
1814	char fooarr[2 * sizeof(int)];
1815
1816	if (e == NULL || h == NULL)
1817		rl_initialize();
1818
1819	return (el_getc(e, fooarr));
1820}
1821
1822
1823/*
1824 * reset the terminal
1825 */
1826/* ARGSUSED */
1827void
1828rl_reset_terminal(const char *p __attribute__((__unused__)))
1829{
1830
1831	if (h == NULL || e == NULL)
1832		rl_initialize();
1833	el_reset(e);
1834}
1835
1836
1837/*
1838 * insert character ``c'' back into input stream, ``count'' times
1839 */
1840int
1841rl_insert(int count, int c)
1842{
1843	char arr[2];
1844
1845	if (h == NULL || e == NULL)
1846		rl_initialize();
1847
1848	/* XXX - int -> char conversion can lose on multichars */
1849	arr[0] = c;
1850	arr[1] = '\0';
1851
1852	for (; count > 0; count--)
1853		el_push(e, arr);
1854
1855	return (0);
1856}
1857
1858int
1859rl_insert_text(const char *text)
1860{
1861	if (!text || *text == 0)
1862		return (0);
1863
1864	if (h == NULL || e == NULL)
1865		rl_initialize();
1866
1867	if (el_insertstr(e, text) < 0)
1868		return (0);
1869	return (int)strlen(text);
1870}
1871
1872/*ARGSUSED*/
1873int
1874rl_newline(int count, int c)
1875{
1876	/*
1877	 * Readline-4.0 appears to ignore the args.
1878	 */
1879	return rl_insert(1, '\n');
1880}
1881
1882/*ARGSUSED*/
1883static unsigned char
1884rl_bind_wrapper(EditLine *el, unsigned char c)
1885{
1886	if (map[c] == NULL)
1887	    return CC_ERROR;
1888
1889	_rl_update_pos();
1890
1891	(*map[c])(NULL, c);
1892
1893	/* If rl_done was set by the above call, deal with it here */
1894	if (rl_done)
1895		return CC_EOF;
1896
1897	return CC_NORM;
1898}
1899
1900int
1901rl_add_defun(const char *name, Function *fun, int c)
1902{
1903	char dest[8];
1904	if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1905		return -1;
1906	map[(unsigned char)c] = fun;
1907	el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1908	vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1909	el_set(e, EL_BIND, dest, name);
1910	return 0;
1911}
1912
1913void
1914rl_callback_read_char()
1915{
1916	int count = 0, done = 0;
1917	const char *buf = el_gets(e, &count);
1918	char *wbuf;
1919
1920	if (buf == NULL || count-- <= 0)
1921		return;
1922	if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1923		done = 1;
1924	if (buf[count] == '\n' || buf[count] == '\r')
1925		done = 2;
1926
1927	if (done && rl_linefunc != NULL) {
1928		el_set(e, EL_UNBUFFERED, 0);
1929		if (done == 2) {
1930		    if ((wbuf = strdup(buf)) != NULL)
1931			wbuf[count] = '\0';
1932		} else
1933			wbuf = NULL;
1934		(*(void (*)(const char *))rl_linefunc)(wbuf);
1935		//el_set(e, EL_UNBUFFERED, 1);
1936	}
1937}
1938
1939void
1940rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
1941{
1942	if (e == NULL) {
1943		rl_initialize();
1944	}
1945	(void)rl_set_prompt(prompt);
1946	rl_linefunc = linefunc;
1947	el_set(e, EL_UNBUFFERED, 1);
1948}
1949
1950void
1951rl_callback_handler_remove(void)
1952{
1953	el_set(e, EL_UNBUFFERED, 0);
1954	rl_linefunc = NULL;
1955}
1956
1957void
1958rl_redisplay(void)
1959{
1960	char a[2];
1961	a[0] = e->el_tty.t_c[TS_IO][C_REPRINT];
1962	a[1] = '\0';
1963	el_push(e, a);
1964}
1965
1966int
1967rl_get_previous_history(int count, int key)
1968{
1969	char a[2];
1970	a[0] = key;
1971	a[1] = '\0';
1972	while (count--)
1973		el_push(e, a);
1974	return 0;
1975}
1976
1977void
1978/*ARGSUSED*/
1979rl_prep_terminal(int meta_flag)
1980{
1981	el_set(e, EL_PREP_TERM, 1);
1982}
1983
1984void
1985rl_deprep_terminal(void)
1986{
1987	el_set(e, EL_PREP_TERM, 0);
1988}
1989
1990int
1991rl_read_init_file(const char *s)
1992{
1993	return(el_source(e, s));
1994}
1995
1996int
1997rl_parse_and_bind(const char *line)
1998{
1999	const char **argv;
2000	int argc;
2001	Tokenizer *tok;
2002
2003	tok = tok_init(NULL);
2004	tok_str(tok, line, &argc, &argv);
2005	argc = el_parse(e, argc, argv);
2006	tok_end(tok);
2007	return (argc ? 1 : 0);
2008}
2009
2010int
2011rl_variable_bind(const char *var, const char *value)
2012{
2013	/*
2014	 * The proper return value is undocument, but this is what the
2015	 * readline source seems to do.
2016	 */
2017	return ((el_set(e, EL_BIND, "", var, value) == -1) ? 1 : 0);
2018}
2019
2020void
2021rl_stuff_char(int c)
2022{
2023	char buf[2];
2024
2025	buf[0] = c;
2026	buf[1] = '\0';
2027	el_insertstr(e, buf);
2028}
2029
2030static int
2031_rl_event_read_char(EditLine *el, char *cp)
2032{
2033	int	n;
2034	ssize_t num_read = 0;
2035
2036	*cp = '\0';
2037	while (rl_event_hook) {
2038
2039		(*rl_event_hook)();
2040
2041#if defined(FIONREAD)
2042		if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2043			return(-1);
2044		if (n)
2045			num_read = read(el->el_infd, cp, 1);
2046		else
2047			num_read = 0;
2048#elif defined(F_SETFL) && defined(O_NDELAY)
2049		if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2050			return(-1);
2051		if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2052			return(-1);
2053		num_read = read(el->el_infd, cp, 1);
2054		if (fcntl(el->el_infd, F_SETFL, n))
2055			return(-1);
2056#else
2057		/* not non-blocking, but what you gonna do? */
2058		num_read = read(el->el_infd, cp, 1);
2059		return(-1);
2060#endif
2061
2062		if (num_read < 0 && errno == EAGAIN)
2063			continue;
2064		if (num_read == 0)
2065			continue;
2066		break;
2067	}
2068	if (!rl_event_hook)
2069		el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2070	return (int)num_read;
2071}
2072
2073static void
2074_rl_update_pos(void)
2075{
2076	const LineInfo *li = el_line(e);
2077
2078	rl_point = (int)(li->cursor - li->buffer);
2079	rl_end = (int)(li->lastchar - li->buffer);
2080}
2081
2082void
2083rl_get_screen_size(int *rows, int *cols)
2084{
2085	if (rows)
2086		el_get(e, EL_GETTC, "li", rows);
2087	if (cols)
2088		el_get(e, EL_GETTC, "co", cols);
2089}
2090
2091void
2092rl_set_screen_size(int rows, int cols)
2093{
2094	char buf[64];
2095	(void)snprintf(buf, sizeof(buf), "%d", rows);
2096	el_set(e, EL_SETTC, "li", buf);
2097	(void)snprintf(buf, sizeof(buf), "%d", cols);
2098	el_set(e, EL_SETTC, "co", buf);
2099}
2100
2101char **
2102rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2103{
2104	size_t len, max, i, j, min;
2105	char **list, *match, *a, *b;
2106
2107	len = 1;
2108	max = 10;
2109	if ((list = malloc(max * sizeof(*list))) == NULL)
2110		return NULL;
2111
2112	while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2113		list[len++] = match;
2114		if (len == max) {
2115			char **nl;
2116			max += 10;
2117			if ((nl = realloc(list, max * sizeof(*nl))) == NULL)
2118				goto out;
2119			list = nl;
2120		}
2121	}
2122	if (len == 1)
2123		goto out;
2124	list[len] = NULL;
2125	if (len == 2) {
2126		if ((list[0] = strdup(list[1])) == NULL)
2127			goto out;
2128		return list;
2129	}
2130	qsort(&list[1], len - 1, sizeof(*list),
2131	    (int (*)(const void *, const void *)) strcmp);
2132	min = SIZE_T_MAX;
2133	for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2134		b = list[i + 1];
2135		for (j = 0; a[j] && a[j] == b[j]; j++)
2136			continue;
2137		if (min > j)
2138			min = j;
2139	}
2140	if (min == 0 && *str) {
2141		if ((list[0] = strdup(str)) == NULL)
2142			goto out;
2143	} else {
2144		if ((list[0] = malloc(min + 1)) == NULL)
2145			goto out;
2146		(void)memcpy(list[0], list[1], min);
2147		list[0][min] = '\0';
2148	}
2149	return list;
2150
2151out:
2152	free(list);
2153	return NULL;
2154}
2155
2156char *
2157rl_filename_completion_function (const char *text, int state)
2158{
2159	return fn_filename_completion_function(text, state);
2160}
2161
2162void
2163rl_forced_update_display(void)
2164{
2165	el_set(e, EL_REFRESH);
2166}
2167
2168int
2169_rl_abort_internal(void)
2170{
2171	el_beep(e);
2172	longjmp(topbuf, 1);
2173	/*NOTREACHED*/
2174}
2175
2176int
2177_rl_qsort_string_compare(char **s1, char **s2)
2178{
2179	return strcoll(*s1, *s2);
2180}
2181
2182HISTORY_STATE *
2183history_get_history_state(void)
2184{
2185	HISTORY_STATE *hs;
2186
2187	if ((hs = malloc(sizeof(HISTORY_STATE))) == NULL)
2188		return (NULL);
2189	hs->length = history_length;
2190	return (hs);
2191}
2192
2193int
2194/*ARGSUSED*/
2195rl_kill_text(int from, int to)
2196{
2197	return 0;
2198}
2199
2200Keymap
2201rl_make_bare_keymap(void)
2202{
2203	return NULL;
2204}
2205
2206Keymap
2207rl_get_keymap(void)
2208{
2209	return NULL;
2210}
2211
2212void
2213/*ARGSUSED*/
2214rl_set_keymap(Keymap k)
2215{
2216}
2217
2218int
2219/*ARGSUSED*/
2220rl_generic_bind(int type, const char * keyseq, const char * data, Keymap k)
2221{
2222	return 0;
2223}
2224
2225int
2226/*ARGSUSED*/
2227rl_bind_key_in_map(int key, rl_command_func_t *fun, Keymap k)
2228{
2229	return 0;
2230}
2231
2232/* unsupported, but needed by python */
2233void
2234rl_cleanup_after_signal(void)
2235{
2236}
2237
2238int
2239rl_on_new_line(void)
2240{
2241	return 0;
2242}
2243