hist.c revision 296435
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 38static 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 $"); 41#endif 42#endif /* not lint && not SCCSID */ 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: head/lib/libedit/hist.c 296435 2016-03-06 21:32:54Z pfg $"); 45 46/* 47 * hist.c: History access functions 48 */ 49#include <stdlib.h> 50#include "el.h" 51 52/* hist_init(): 53 * Initialization function. 54 */ 55protected int 56hist_init(EditLine *el) 57{ 58 59 el->el_history.fun = NULL; 60 el->el_history.ref = NULL; 61 el->el_history.buf = el_malloc(EL_BUFSIZ * sizeof(*el->el_history.buf)); 62 el->el_history.sz = EL_BUFSIZ; 63 if (el->el_history.buf == NULL) 64 return -1; 65 el->el_history.last = el->el_history.buf; 66 return 0; 67} 68 69 70/* hist_end(): 71 * clean up history; 72 */ 73protected void 74hist_end(EditLine *el) 75{ 76 77 el_free(el->el_history.buf); 78 el->el_history.buf = NULL; 79} 80 81 82/* hist_set(): 83 * Set new history interface 84 */ 85protected int 86hist_set(EditLine *el, hist_fun_t fun, void *ptr) 87{ 88 89 el->el_history.ref = ptr; 90 el->el_history.fun = fun; 91 return 0; 92} 93 94 95/* hist_get(): 96 * Get a history line and update it in the buffer. 97 * eventno tells us the event to get. 98 */ 99protected el_action_t 100hist_get(EditLine *el) 101{ 102 const Char *hp; 103 int h; 104 105 if (el->el_history.eventno == 0) { /* if really the current line */ 106 (void) Strncpy(el->el_line.buffer, el->el_history.buf, 107 el->el_history.sz); 108 el->el_line.lastchar = el->el_line.buffer + 109 (el->el_history.last - el->el_history.buf); 110 111#ifdef KSHVI 112 if (el->el_map.type == MAP_VI) 113 el->el_line.cursor = el->el_line.buffer; 114 else 115#endif /* KSHVI */ 116 el->el_line.cursor = el->el_line.lastchar; 117 118 return CC_REFRESH; 119 } 120 if (el->el_history.ref == NULL) 121 return CC_ERROR; 122 123 hp = HIST_FIRST(el); 124 125 if (hp == NULL) 126 return CC_ERROR; 127 128 for (h = 1; h < el->el_history.eventno; h++) 129 if ((hp = HIST_NEXT(el)) == NULL) { 130 el->el_history.eventno = h; 131 return CC_ERROR; 132 } 133 (void) Strncpy(el->el_line.buffer, hp, 134 (size_t)(el->el_line.limit - el->el_line.buffer)); 135 el->el_line.buffer[el->el_line.limit - el->el_line.buffer - 1] = '\0'; 136 el->el_line.lastchar = el->el_line.buffer + Strlen(el->el_line.buffer); 137 138 if (el->el_line.lastchar > el->el_line.buffer 139 && el->el_line.lastchar[-1] == '\n') 140 el->el_line.lastchar--; 141 if (el->el_line.lastchar > el->el_line.buffer 142 && el->el_line.lastchar[-1] == ' ') 143 el->el_line.lastchar--; 144#ifdef KSHVI 145 if (el->el_map.type == MAP_VI) 146 el->el_line.cursor = el->el_line.buffer; 147 else 148#endif /* KSHVI */ 149 el->el_line.cursor = el->el_line.lastchar; 150 151 return CC_REFRESH; 152} 153 154 155/* hist_command() 156 * process a history command 157 */ 158protected int 159hist_command(EditLine *el, int argc, const Char **argv) 160{ 161 const Char *str; 162 int num; 163 TYPE(HistEvent) ev; 164 165 if (el->el_history.ref == NULL) 166 return -1; 167 168 if (argc == 1 || Strcmp(argv[1], STR("list")) == 0) { 169 /* List history entries */ 170 171 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) 172 (void) fprintf(el->el_outfile, "%d %s", 173 el->el_history.ev.num, ct_encode_string(str, &el->el_scratch)); 174 return 0; 175 } 176 177 if (argc != 3) 178 return -1; 179 180 num = (int)Strtol(argv[2], NULL, 0); 181 182 if (Strcmp(argv[1], STR("size")) == 0) 183 return FUNW(history)(el->el_history.ref, &ev, H_SETSIZE, num); 184 185 if (Strcmp(argv[1], STR("unique")) == 0) 186 return FUNW(history)(el->el_history.ref, &ev, H_SETUNIQUE, num); 187 188 return -1; 189} 190 191/* hist_enlargebuf() 192 * Enlarge history buffer to specified value. Called from el_enlargebufs(). 193 * Return 0 for failure, 1 for success. 194 */ 195protected int 196/*ARGSUSED*/ 197hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz) 198{ 199 Char *newbuf; 200 201 newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf)); 202 if (!newbuf) 203 return 0; 204 205 (void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf)); 206 207 el->el_history.last = newbuf + 208 (el->el_history.last - el->el_history.buf); 209 el->el_history.buf = newbuf; 210 el->el_history.sz = newsz; 211 212 return 1; 213} 214 215#ifdef WIDECHAR 216protected wchar_t * 217hist_convert(EditLine *el, int fn, void *arg) 218{ 219 HistEventW ev; 220 if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1) 221 return NULL; 222 return ct_decode_string((const char *)(const void *)ev.str, 223 &el->el_scratch); 224} 225#endif 226