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
38 static 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$");
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 */
57 protected int
hist_init(EditLine * el)58 hist_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 */
75 protected void
hist_end(EditLine * el)76 hist_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 */
87 protected int
hist_set(EditLine * el,hist_fun_t fun,void * ptr)88 hist_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 */
101 protected el_action_t
hist_get(EditLine * el)102 hist_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 */
160 protected int
hist_command(EditLine * el,int argc,const Char ** argv)161 hist_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 */
197 protected int
198 /*ARGSUSED*/
hist_enlargebuf(EditLine * el,size_t oldsz,size_t newsz)199 hist_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
218 protected wchar_t *
hist_convert(EditLine * el,int fn,void * arg)219 hist_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