1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Christos Zoulas of Cornell University.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	$NetBSD: hist.c,v 1.15 2003/11/01 23:36:39 christos Exp $
33 */
34
35#if !defined(lint) && !defined(SCCSID)
36static char sccsid[] = "@(#)hist.c	8.1 (Berkeley) 6/4/93";
37#endif /* not lint && not SCCSID */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41/*
42 * hist.c: History access functions
43 */
44#include "sys.h"
45#include <stdlib.h>
46#include "el.h"
47
48/* hist_init():
49 *	Initialization function.
50 */
51protected int
52hist_init(EditLine *el)
53{
54
55	el->el_history.fun = NULL;
56	el->el_history.ref = NULL;
57	el->el_history.buf = (char *) el_malloc(EL_BUFSIZ);
58	el->el_history.sz  = EL_BUFSIZ;
59	if (el->el_history.buf == NULL)
60		return (-1);
61	el->el_history.last = el->el_history.buf;
62	return (0);
63}
64
65
66/* hist_end():
67 *	clean up history;
68 */
69protected void
70hist_end(EditLine *el)
71{
72
73	el_free((ptr_t) el->el_history.buf);
74	el->el_history.buf = NULL;
75}
76
77
78/* hist_set():
79 *	Set new history interface
80 */
81protected int
82hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr)
83{
84
85	el->el_history.ref = ptr;
86	el->el_history.fun = fun;
87	return (0);
88}
89
90
91/* hist_get():
92 *	Get a history line and update it in the buffer.
93 *	eventno tells us the event to get.
94 */
95protected el_action_t
96hist_get(EditLine *el)
97{
98	const char *hp;
99	int h;
100
101	if (el->el_history.eventno == 0) {	/* if really the current line */
102		(void) strncpy(el->el_line.buffer, el->el_history.buf,
103		    el->el_history.sz);
104		el->el_line.lastchar = el->el_line.buffer +
105		    (el->el_history.last - el->el_history.buf);
106
107#ifdef KSHVI
108		if (el->el_map.type == MAP_VI)
109			el->el_line.cursor = el->el_line.buffer;
110		else
111#endif /* KSHVI */
112			el->el_line.cursor = el->el_line.lastchar;
113
114		return (CC_REFRESH);
115	}
116	if (el->el_history.ref == NULL)
117		return (CC_ERROR);
118
119	hp = HIST_FIRST(el);
120
121	if (hp == NULL)
122		return (CC_ERROR);
123
124	for (h = 1; h < el->el_history.eventno; h++)
125		if ((hp = HIST_NEXT(el)) == NULL) {
126			el->el_history.eventno = h;
127			return (CC_ERROR);
128		}
129	(void) strlcpy(el->el_line.buffer, hp,
130			(size_t)(el->el_line.limit - el->el_line.buffer));
131	el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer);
132
133	if (el->el_line.lastchar > el->el_line.buffer
134	    && el->el_line.lastchar[-1] == '\n')
135		el->el_line.lastchar--;
136	if (el->el_line.lastchar > el->el_line.buffer
137	    && el->el_line.lastchar[-1] == ' ')
138		el->el_line.lastchar--;
139#ifdef KSHVI
140	if (el->el_map.type == MAP_VI)
141		el->el_line.cursor = el->el_line.buffer;
142	else
143#endif /* KSHVI */
144		el->el_line.cursor = el->el_line.lastchar;
145
146	return (CC_REFRESH);
147}
148
149
150/* hist_command()
151 *	process a history command
152 */
153protected int
154hist_command(EditLine *el, int argc, const char **argv)
155{
156	const char *str;
157	int num;
158	HistEvent ev;
159
160	if (el->el_history.ref == NULL)
161		return (-1);
162
163	if (argc == 1 || strcmp(argv[1], "list") == 0) {
164		 /* List history entries */
165
166		for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
167			(void) fprintf(el->el_outfile, "%d %s",
168			    el->el_history.ev.num, str);
169		return (0);
170	}
171
172	if (argc != 3)
173		return (-1);
174
175	num = (int)strtol(argv[2], NULL, 0);
176
177	if (strcmp(argv[1], "size") == 0)
178		return history(el->el_history.ref, &ev, H_SETSIZE, num);
179
180	if (strcmp(argv[1], "unique") == 0)
181		return history(el->el_history.ref, &ev, H_SETUNIQUE, num);
182
183	return -1;
184}
185
186/* hist_enlargebuf()
187 *	Enlarge history buffer to specified value. Called from el_enlargebufs().
188 *	Return 0 for failure, 1 for success.
189 */
190protected int
191/*ARGSUSED*/
192hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
193{
194	char *newbuf;
195
196	newbuf = realloc(el->el_history.buf, newsz);
197	if (!newbuf)
198		return 0;
199
200	(void) memset(&newbuf[oldsz], '\0', newsz - oldsz);
201
202	el->el_history.last = newbuf +
203				(el->el_history.last - el->el_history.buf);
204	el->el_history.buf = newbuf;
205	el->el_history.sz  = newsz;
206
207	return 1;
208}
209