Import NetBSD's LibEdit version 2012-03-11 on vendor branch
[dragonfly.git] / contrib / libedit / src / hist.c
1 /*      $NetBSD: hist.c,v 1.20 2011/07/29 15:16:33 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
38 static char sccsid[] = "@(#)hist.c      8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: hist.c,v 1.20 2011/07/29 15:16:33 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43
44 /*
45  * hist.c: History access functions
46  */
47 #include <stdlib.h>
48 #include "el.h"
49
50 /* hist_init():
51  *      Initialization function.
52  */
53 protected int
54 hist_init(EditLine *el)
55 {
56
57         el->el_history.fun = NULL;
58         el->el_history.ref = NULL;
59         el->el_history.buf = el_malloc(EL_BUFSIZ * sizeof(*el->el_history.buf));
60         el->el_history.sz  = EL_BUFSIZ;
61         if (el->el_history.buf == NULL)
62                 return -1;
63         el->el_history.last = el->el_history.buf;
64         return 0;
65 }
66
67
68 /* hist_end():
69  *      clean up history;
70  */
71 protected void
72 hist_end(EditLine *el)
73 {
74
75         el_free(el->el_history.buf);
76         el->el_history.buf = NULL;
77 }
78
79
80 /* hist_set():
81  *      Set new history interface
82  */
83 protected int
84 hist_set(EditLine *el, hist_fun_t fun, void *ptr)
85 {
86
87         el->el_history.ref = ptr;
88         el->el_history.fun = fun;
89         return 0;
90 }
91
92
93 /* hist_get():
94  *      Get a history line and update it in the buffer.
95  *      eventno tells us the event to get.
96  */
97 protected el_action_t
98 hist_get(EditLine *el)
99 {
100         const Char *hp;
101         int h;
102
103         if (el->el_history.eventno == 0) {      /* if really the current line */
104                 (void) Strncpy(el->el_line.buffer, el->el_history.buf,
105                     el->el_history.sz);
106                 el->el_line.lastchar = el->el_line.buffer +
107                     (el->el_history.last - el->el_history.buf);
108
109 #ifdef KSHVI
110                 if (el->el_map.type == MAP_VI)
111                         el->el_line.cursor = el->el_line.buffer;
112                 else
113 #endif /* KSHVI */
114                         el->el_line.cursor = el->el_line.lastchar;
115
116                 return CC_REFRESH;
117         }
118         if (el->el_history.ref == NULL)
119                 return CC_ERROR;
120
121         hp = HIST_FIRST(el);
122
123         if (hp == NULL)
124                 return CC_ERROR;
125
126         for (h = 1; h < el->el_history.eventno; h++)
127                 if ((hp = HIST_NEXT(el)) == NULL) {
128                         el->el_history.eventno = h;
129                         return CC_ERROR;
130                 }
131         (void) Strncpy(el->el_line.buffer, hp,
132                         (size_t)(el->el_line.limit - el->el_line.buffer));
133         el->el_line.buffer[el->el_line.limit - el->el_line.buffer - 1] = '\0';
134         el->el_line.lastchar = el->el_line.buffer + Strlen(el->el_line.buffer);
135
136         if (el->el_line.lastchar > el->el_line.buffer
137             && el->el_line.lastchar[-1] == '\n')
138                 el->el_line.lastchar--;
139         if (el->el_line.lastchar > el->el_line.buffer
140             && el->el_line.lastchar[-1] == ' ')
141                 el->el_line.lastchar--;
142 #ifdef KSHVI
143         if (el->el_map.type == MAP_VI)
144                 el->el_line.cursor = el->el_line.buffer;
145         else
146 #endif /* KSHVI */
147                 el->el_line.cursor = el->el_line.lastchar;
148
149         return CC_REFRESH;
150 }
151
152
153 /* hist_command()
154  *      process a history command
155  */
156 protected int
157 hist_command(EditLine *el, int argc, const Char **argv)
158 {
159         const Char *str;
160         int num;
161         TYPE(HistEvent) ev;
162
163         if (el->el_history.ref == NULL)
164                 return -1;
165
166         if (argc == 1 || Strcmp(argv[1], STR("list")) == 0) {
167                  /* List history entries */
168
169                 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
170                         (void) fprintf(el->el_outfile, "%d %s",
171                             el->el_history.ev.num, ct_encode_string(str, &el->el_scratch));
172                 return 0;
173         }
174
175         if (argc != 3)
176                 return -1;
177
178         num = (int)Strtol(argv[2], NULL, 0);
179
180         if (Strcmp(argv[1], STR("size")) == 0)
181                 return FUNW(history)(el->el_history.ref, &ev, H_SETSIZE, num);
182
183         if (Strcmp(argv[1], STR("unique")) == 0)
184                 return FUNW(history)(el->el_history.ref, &ev, H_SETUNIQUE, num);
185
186         return -1;
187 }
188
189 /* hist_enlargebuf()
190  *      Enlarge history buffer to specified value. Called from el_enlargebufs().
191  *      Return 0 for failure, 1 for success.
192  */
193 protected int
194 /*ARGSUSED*/
195 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
196 {
197         Char *newbuf;
198
199         newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf));
200         if (!newbuf)
201                 return 0;
202
203         (void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf));
204
205         el->el_history.last = newbuf +
206                                 (el->el_history.last - el->el_history.buf);
207         el->el_history.buf = newbuf;
208         el->el_history.sz  = newsz;
209
210         return 1;
211 }
212
213 #ifdef WIDECHAR
214 protected wchar_t *
215 hist_convert(EditLine *el, int fn, void *arg)
216 {
217         HistEventW ev;
218         if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1)
219                 return NULL;
220         return ct_decode_string((const char *)(const void *)ev.str,
221             &el->el_scratch);
222 }
223 #endif