1 /* $OpenBSD: hist.c,v 1.8 2009/10/27 23:59:28 deraadt Exp $ */ 2 /* $NetBSD: hist.c,v 1.15 2003/11/01 23:36:39 christos Exp $ */ 3 4 /*- 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Christos Zoulas of Cornell University. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "config.h" 37 38 /* 39 * hist.c: History access functions 40 */ 41 #include <stdlib.h> 42 #include "el.h" 43 44 /* hist_init(): 45 * Initialization function. 46 */ 47 protected int 48 hist_init(EditLine *el) 49 { 50 51 el->el_history.fun = NULL; 52 el->el_history.ref = NULL; 53 el->el_history.buf = (char *) el_malloc(EL_BUFSIZ); 54 el->el_history.sz = EL_BUFSIZ; 55 if (el->el_history.buf == NULL) 56 return (-1); 57 el->el_history.last = el->el_history.buf; 58 return (0); 59 } 60 61 62 /* hist_end(): 63 * clean up history; 64 */ 65 protected void 66 hist_end(EditLine *el) 67 { 68 69 el_free((ptr_t) el->el_history.buf); 70 el->el_history.buf = NULL; 71 } 72 73 74 /* hist_set(): 75 * Set new history interface 76 */ 77 protected int 78 hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr) 79 { 80 81 el->el_history.ref = ptr; 82 el->el_history.fun = fun; 83 return (0); 84 } 85 86 87 /* hist_get(): 88 * Get a history line and update it in the buffer. 89 * eventno tells us the event to get. 90 */ 91 protected el_action_t 92 hist_get(EditLine *el) 93 { 94 const char *hp; 95 int h; 96 97 if (el->el_history.eventno == 0) { /* if really the current line */ 98 (void) strncpy(el->el_line.buffer, el->el_history.buf, 99 el->el_history.sz); 100 el->el_line.lastchar = el->el_line.buffer + 101 (el->el_history.last - el->el_history.buf); 102 103 #ifdef KSHVI 104 if (el->el_map.type == MAP_VI) 105 el->el_line.cursor = el->el_line.buffer; 106 else 107 #endif /* KSHVI */ 108 el->el_line.cursor = el->el_line.lastchar; 109 110 return (CC_REFRESH); 111 } 112 if (el->el_history.ref == NULL) 113 return (CC_ERROR); 114 115 hp = HIST_FIRST(el); 116 117 if (hp == NULL) 118 return (CC_ERROR); 119 120 for (h = 1; h < el->el_history.eventno; h++) 121 if ((hp = HIST_NEXT(el)) == NULL) { 122 el->el_history.eventno = h; 123 return (CC_ERROR); 124 } 125 (void) strlcpy(el->el_line.buffer, hp, 126 (size_t)(el->el_line.limit - el->el_line.buffer)); 127 el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer); 128 129 if (el->el_line.lastchar > el->el_line.buffer 130 && el->el_line.lastchar[-1] == '\n') 131 el->el_line.lastchar--; 132 if (el->el_line.lastchar > el->el_line.buffer 133 && el->el_line.lastchar[-1] == ' ') 134 el->el_line.lastchar--; 135 #ifdef KSHVI 136 if (el->el_map.type == MAP_VI) 137 el->el_line.cursor = el->el_line.buffer; 138 else 139 #endif /* KSHVI */ 140 el->el_line.cursor = el->el_line.lastchar; 141 142 return (CC_REFRESH); 143 } 144 145 146 /* hist_command() 147 * process a history command 148 */ 149 protected int 150 hist_command(EditLine *el, int argc, const char **argv) 151 { 152 const char *str; 153 int num; 154 HistEvent ev; 155 156 if (el->el_history.ref == NULL) 157 return (-1); 158 159 if (argc == 1 || strcmp(argv[1], "list") == 0) { 160 /* List history entries */ 161 162 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) 163 (void) fprintf(el->el_outfile, "%d %s", 164 el->el_history.ev.num, str); 165 return (0); 166 } 167 168 if (argc != 3) 169 return (-1); 170 171 num = (int)strtol(argv[2], NULL, 0); 172 173 if (strcmp(argv[1], "size") == 0) 174 return history(el->el_history.ref, &ev, H_SETSIZE, num); 175 176 if (strcmp(argv[1], "unique") == 0) 177 return history(el->el_history.ref, &ev, H_SETUNIQUE, num); 178 179 return -1; 180 } 181 182 /* hist_enlargebuf() 183 * Enlarge history buffer to specified value. Called from el_enlargebufs(). 184 * Return 0 for failure, 1 for success. 185 */ 186 protected int 187 /*ARGSUSED*/ 188 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz) 189 { 190 char *newbuf; 191 192 newbuf = realloc(el->el_history.buf, newsz); 193 if (!newbuf) 194 return 0; 195 196 (void) memset(&newbuf[oldsz], '\0', newsz - oldsz); 197 198 el->el_history.last = newbuf + 199 (el->el_history.last - el->el_history.buf); 200 el->el_history.buf = newbuf; 201 el->el_history.sz = newsz; 202 203 return 1; 204 } 205