1 /* $NetBSD: hist.c,v 1.34 2019/07/23 10:19:35 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 1.34 2019/07/23 10:19:35 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 <string.h>
49 #include <vis.h>
50
51 #include "el.h"
52
53 /* hist_init():
54 * Initialization function.
55 */
56 libedit_private int
hist_init(EditLine * el)57 hist_init(EditLine *el)
58 {
59
60 el->el_history.fun = NULL;
61 el->el_history.ref = NULL;
62 el->el_history.buf = el_calloc(EL_BUFSIZ, sizeof(*el->el_history.buf));
63 if (el->el_history.buf == NULL)
64 return -1;
65 el->el_history.sz = EL_BUFSIZ;
66 el->el_history.last = el->el_history.buf;
67 return 0;
68 }
69
70
71 /* hist_end():
72 * clean up history;
73 */
74 libedit_private void
hist_end(EditLine * el)75 hist_end(EditLine *el)
76 {
77
78 el_free(el->el_history.buf);
79 el->el_history.buf = NULL;
80 }
81
82
83 /* hist_set():
84 * Set new history interface
85 */
86 libedit_private int
hist_set(EditLine * el,hist_fun_t fun,void * ptr)87 hist_set(EditLine *el, hist_fun_t fun, void *ptr)
88 {
89
90 el->el_history.ref = ptr;
91 el->el_history.fun = fun;
92 return 0;
93 }
94
95
96 /* hist_get():
97 * Get a history line and update it in the buffer.
98 * eventno tells us the event to get.
99 */
100 libedit_private el_action_t
hist_get(EditLine * el)101 hist_get(EditLine *el)
102 {
103 const wchar_t *hp;
104 int h;
105 size_t blen, hlen;
106
107 if (el->el_history.eventno == 0) { /* if really the current line */
108 (void) wcsncpy(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 goto out;
133
134 hlen = wcslen(hp) + 1;
135 blen = (size_t)(el->el_line.limit - el->el_line.buffer);
136 if (hlen > blen && !ch_enlargebufs(el, hlen))
137 goto out;
138
139 memcpy(el->el_line.buffer, hp, hlen * sizeof(*hp));
140 el->el_line.lastchar = el->el_line.buffer + hlen - 1;
141
142 if (el->el_line.lastchar > el->el_line.buffer
143 && el->el_line.lastchar[-1] == '\n')
144 el->el_line.lastchar--;
145 if (el->el_line.lastchar > el->el_line.buffer
146 && el->el_line.lastchar[-1] == ' ')
147 el->el_line.lastchar--;
148 #ifdef KSHVI
149 if (el->el_map.type == MAP_VI)
150 el->el_line.cursor = el->el_line.buffer;
151 else
152 #endif /* KSHVI */
153 el->el_line.cursor = el->el_line.lastchar;
154
155 return CC_REFRESH;
156 out:
157 el->el_history.eventno = h;
158 return CC_ERROR;
159
160 }
161
162
163 /* hist_command()
164 * process a history command
165 */
166 libedit_private int
hist_command(EditLine * el,int argc,const wchar_t ** argv)167 hist_command(EditLine *el, int argc, const wchar_t **argv)
168 {
169 const wchar_t *str;
170 int num;
171 HistEventW ev;
172
173 if (el->el_history.ref == NULL)
174 return -1;
175
176 if (argc == 1 || wcscmp(argv[1], L"list") == 0) {
177 size_t maxlen = 0;
178 char *buf = NULL;
179 int hno = 1;
180 /* List history entries */
181
182 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) {
183 char *ptr =
184 ct_encode_string(str, &el->el_scratch);
185 size_t len = strlen(ptr);
186 if (len > 0 && ptr[len - 1] == '\n')
187 ptr[--len] = '\0';
188 len = len * 4 + 1;
189 if (len >= maxlen) {
190 maxlen = len + 1024;
191 char *nbuf = el_realloc(buf, maxlen);
192 if (nbuf == NULL) {
193 el_free(buf);
194 return -1;
195 }
196 buf = nbuf;
197 }
198 strvis(buf, ptr, VIS_NL);
199 (void) fprintf(el->el_outfile, "%d\t%s\n",
200 hno++, buf);
201 }
202 el_free(buf);
203 return 0;
204 }
205
206 if (argc != 3)
207 return -1;
208
209 num = (int)wcstol(argv[2], NULL, 0);
210
211 if (wcscmp(argv[1], L"size") == 0)
212 return history_w(el->el_history.ref, &ev, H_SETSIZE, num);
213
214 if (wcscmp(argv[1], L"unique") == 0)
215 return history_w(el->el_history.ref, &ev, H_SETUNIQUE, num);
216
217 return -1;
218 }
219
220 /* hist_enlargebuf()
221 * Enlarge history buffer to specified value. Called from el_enlargebufs().
222 * Return 0 for failure, 1 for success.
223 */
224 libedit_private int
225 /*ARGSUSED*/
hist_enlargebuf(EditLine * el,size_t oldsz,size_t newsz)226 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
227 {
228 wchar_t *newbuf;
229
230 newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf));
231 if (!newbuf)
232 return 0;
233
234 (void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf));
235
236 el->el_history.last = newbuf +
237 (el->el_history.last - el->el_history.buf);
238 el->el_history.buf = newbuf;
239 el->el_history.sz = newsz;
240
241 return 1;
242 }
243
244 libedit_private wchar_t *
hist_convert(EditLine * el,int fn,void * arg)245 hist_convert(EditLine *el, int fn, void *arg)
246 {
247 HistEventW ev;
248 if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1)
249 return NULL;
250 return ct_decode_string((const char *)(const void *)ev.str,
251 &el->el_scratch);
252 }
253