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 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 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 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 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 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*/ 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 * 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