hist.c revision 1573 
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. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#if !defined(lint) && !defined(SCCSID)
38static char sccsid[] = "@(#)hist.c	8.1 (Berkeley) 6/4/93";
39#endif /* not lint && not SCCSID */
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(el)
53    EditLine *el;
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.last  = el->el_history.buf;
59    return 0;
60}
61
62
63/* hist_end():
64 *	clean up history;
65 */
66protected void
67hist_end(el)
68    EditLine *el;
69{
70    el_free((ptr_t) el->el_history.buf);
71    el->el_history.buf   = NULL;
72}
73
74
75/* hist_set():
76 *	Set new history interface
77 */
78protected int
79hist_set(el, fun, ptr)
80    EditLine *el;
81    hist_fun_t fun;
82    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(el)
97    EditLine *el;
98{
99    const char    *hp;
100    int     h;
101
102    if (el->el_history.eventno == 0) {	/* if really the current line */
103	(void) strncpy(el->el_line.buffer, el->el_history.buf, EL_BUFSIZ);
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
117    if (el->el_history.ref == NULL)
118	return CC_ERROR;
119
120    hp = HIST_FIRST(el);
121
122    if (hp == NULL)
123	return CC_ERROR;
124
125    for (h = 1; h < el->el_history.eventno; h++)
126	if ((hp = HIST_NEXT(el)) == NULL) {
127	    el->el_history.eventno = h;
128	    return CC_ERROR;
129	}
130
131    (void) strncpy(el->el_line.buffer, hp, EL_BUFSIZ);
132    el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer);
133
134    if (el->el_line.lastchar > el->el_line.buffer) {
135	if (el->el_line.lastchar[-1] == '\n')
136	    el->el_line.lastchar--;
137	if (el->el_line.lastchar[-1] == ' ')
138	    el->el_line.lastchar--;
139	if (el->el_line.lastchar < el->el_line.buffer)
140	    el->el_line.lastchar = el->el_line.buffer;
141    }
142
143#ifdef KSHVI
144    if (el->el_map.type == MAP_VI)
145	el->el_line.cursor = el->el_line.buffer;
146    else
147#endif /* KSHVI */
148	el->el_line.cursor = el->el_line.lastchar;
149
150    return CC_REFRESH;
151}
152
153/* hist_list()
154 *	List history entries
155 */
156protected int
157/*ARGSUSED*/
158hist_list(el, argc, argv)
159    EditLine *el;
160    int argc;
161    char **argv;
162{
163    const char *str;
164
165    if (el->el_history.ref == NULL)
166	return -1;
167    for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
168	(void) fprintf(el->el_outfile, "%d %s", el->el_history.ev->num, str);
169    return 0;
170}
171