1/*	$NetBSD: hist.c,v 1.24 2016/02/16 22:53:14 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "config.h"
36#if !defined(lint) && !defined(SCCSID)
37#if 0
38static char sccsid[] = "@(#)hist.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: hist.c,v 1.24 2016/02/16 22:53:14 christos Exp $");
41#endif
42#endif /* not lint && not SCCSID */
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: stable/11/lib/libedit/hist.c 313981 2017-02-20 03:33:59Z pfg $");
45
46/*
47 * hist.c: History access functions
48 */
49#include <stdlib.h>
50#include <string.h>
51
52#include "el.h"
53
54/* hist_init():
55 *	Initialization function.
56 */
57protected int
58hist_init(EditLine *el)
59{
60
61	el->el_history.fun = NULL;
62	el->el_history.ref = NULL;
63	el->el_history.buf = el_malloc(EL_BUFSIZ * sizeof(*el->el_history.buf));
64	el->el_history.sz  = EL_BUFSIZ;
65	if (el->el_history.buf == NULL)
66		return -1;
67	el->el_history.last = el->el_history.buf;
68	return 0;
69}
70
71
72/* hist_end():
73 *	clean up history;
74 */
75protected void
76hist_end(EditLine *el)
77{
78
79	el_free(el->el_history.buf);
80	el->el_history.buf = NULL;
81}
82
83
84/* hist_set():
85 *	Set new history interface
86 */
87protected int
88hist_set(EditLine *el, hist_fun_t fun, void *ptr)
89{
90
91	el->el_history.ref = ptr;
92	el->el_history.fun = fun;
93	return 0;
94}
95
96
97/* hist_get():
98 *	Get a history line and update it in the buffer.
99 *	eventno tells us the event to get.
100 */
101protected el_action_t
102hist_get(EditLine *el)
103{
104	const Char *hp;
105	int h;
106
107	if (el->el_history.eventno == 0) {	/* if really the current line */
108		(void) Strncpy(el->el_line.buffer, el->el_history.buf,
109		    el->el_history.sz);
110		el->el_line.lastchar = el->el_line.buffer +
111		    (el->el_history.last - el->el_history.buf);
112
113#ifdef KSHVI
114		if (el->el_map.type == MAP_VI)
115			el->el_line.cursor = el->el_line.buffer;
116		else
117#endif /* KSHVI */
118			el->el_line.cursor = el->el_line.lastchar;
119
120		return CC_REFRESH;
121	}
122	if (el->el_history.ref == NULL)
123		return CC_ERROR;
124
125	hp = HIST_FIRST(el);
126
127	if (hp == NULL)
128		return CC_ERROR;
129
130	for (h = 1; h < el->el_history.eventno; h++)
131		if ((hp = HIST_NEXT(el)) == NULL) {
132			el->el_history.eventno = h;
133			return CC_ERROR;
134		}
135	(void) Strncpy(el->el_line.buffer, hp,
136			(size_t)(el->el_line.limit - el->el_line.buffer));
137	el->el_line.buffer[el->el_line.limit - el->el_line.buffer - 1] = '\0';
138	el->el_line.lastchar = el->el_line.buffer + Strlen(el->el_line.buffer);
139
140	if (el->el_line.lastchar > el->el_line.buffer
141	    && el->el_line.lastchar[-1] == '\n')
142		el->el_line.lastchar--;
143	if (el->el_line.lastchar > el->el_line.buffer
144	    && el->el_line.lastchar[-1] == ' ')
145		el->el_line.lastchar--;
146#ifdef KSHVI
147	if (el->el_map.type == MAP_VI)
148		el->el_line.cursor = el->el_line.buffer;
149	else
150#endif /* KSHVI */
151		el->el_line.cursor = el->el_line.lastchar;
152
153	return CC_REFRESH;
154}
155
156
157/* hist_command()
158 *	process a history command
159 */
160protected int
161hist_command(EditLine *el, int argc, const Char **argv)
162{
163	const Char *str;
164	int num;
165	TYPE(HistEvent) ev;
166
167	if (el->el_history.ref == NULL)
168		return -1;
169
170	if (argc == 1 || Strcmp(argv[1], STR("list")) == 0) {
171		 /* List history entries */
172
173		for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
174			(void) fprintf(el->el_outfile, "%d %s",
175			    el->el_history.ev.num, ct_encode_string(str, &el->el_scratch));
176		return 0;
177	}
178
179	if (argc != 3)
180		return -1;
181
182	num = (int)Strtol(argv[2], NULL, 0);
183
184	if (Strcmp(argv[1], STR("size")) == 0)
185		return FUNW(history)(el->el_history.ref, &ev, H_SETSIZE, num);
186
187	if (Strcmp(argv[1], STR("unique")) == 0)
188		return FUNW(history)(el->el_history.ref, &ev, H_SETUNIQUE, num);
189
190	return -1;
191}
192
193/* hist_enlargebuf()
194 *	Enlarge history buffer to specified value. Called from el_enlargebufs().
195 *	Return 0 for failure, 1 for success.
196 */
197protected int
198/*ARGSUSED*/
199hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
200{
201	Char *newbuf;
202
203	newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf));
204	if (!newbuf)
205		return 0;
206
207	(void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf));
208
209	el->el_history.last = newbuf +
210				(el->el_history.last - el->el_history.buf);
211	el->el_history.buf = newbuf;
212	el->el_history.sz  = newsz;
213
214	return 1;
215}
216
217#ifdef WIDECHAR
218protected wchar_t *
219hist_convert(EditLine *el, int fn, void *arg)
220{
221	HistEventW ev;
222	if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1)
223		return NULL;
224	return ct_decode_string((const char *)(const void *)ev.str,
225	    &el->el_scratch);
226}
227#endif
228