hist.c
1 /* $NetBSD: hist.c,v 1.17 2009/12/30 23:54:52 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 1.17 2009/12/30 23:54:52 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 "el.h" 49 50 /* hist_init(): 51 * Initialization function. 52 */ 53 protected int 54 hist_init(EditLine *el) 55 { 56 57 el->el_history.fun = NULL; 58 el->el_history.ref = NULL; 59 el->el_history.buf = el_malloc(EL_BUFSIZ * sizeof(*el->el_history.buf)); 60 el->el_history.sz = EL_BUFSIZ; 61 if (el->el_history.buf == NULL) 62 return (-1); 63 el->el_history.last = el->el_history.buf; 64 return (0); 65 } 66 67 68 /* hist_end(): 69 * clean up history; 70 */ 71 protected void 72 hist_end(EditLine *el) 73 { 74 75 el_free((ptr_t) el->el_history.buf); 76 el->el_history.buf = NULL; 77 } 78 79 80 /* hist_set(): 81 * Set new history interface 82 */ 83 protected int 84 hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr) 85 { 86 87 el->el_history.ref = ptr; 88 el->el_history.fun = fun; 89 return (0); 90 } 91 92 93 /* hist_get(): 94 * Get a history line and update it in the buffer. 95 * eventno tells us the event to get. 96 */ 97 protected el_action_t 98 hist_get(EditLine *el) 99 { 100 const Char *hp; 101 int h; 102 103 if (el->el_history.eventno == 0) { /* if really the current line */ 104 (void) Strncpy(el->el_line.buffer, el->el_history.buf, 105 el->el_history.sz); 106 el->el_line.lastchar = el->el_line.buffer + 107 (el->el_history.last - el->el_history.buf); 108 109 #ifdef KSHVI 110 if (el->el_map.type == MAP_VI) 111 el->el_line.cursor = el->el_line.buffer; 112 else 113 #endif /* KSHVI */ 114 el->el_line.cursor = el->el_line.lastchar; 115 116 return (CC_REFRESH); 117 } 118 if (el->el_history.ref == NULL) 119 return (CC_ERROR); 120 121 hp = HIST_FIRST(el); 122 123 if (hp == NULL) 124 return (CC_ERROR); 125 126 for (h = 1; h < el->el_history.eventno; h++) 127 if ((hp = HIST_NEXT(el)) == NULL) { 128 el->el_history.eventno = h; 129 return (CC_ERROR); 130 } 131 (void) Strncpy(el->el_line.buffer, hp, 132 (size_t)(el->el_line.limit - el->el_line.buffer)); 133 el->el_line.buffer[el->el_line.limit - el->el_line.buffer - 1] = '\0'; 134 el->el_line.lastchar = el->el_line.buffer + Strlen(el->el_line.buffer); 135 136 if (el->el_line.lastchar > el->el_line.buffer 137 && el->el_line.lastchar[-1] == '\n') 138 el->el_line.lastchar--; 139 if (el->el_line.lastchar > el->el_line.buffer 140 && el->el_line.lastchar[-1] == ' ') 141 el->el_line.lastchar--; 142 #ifdef KSHVI 143 if (el->el_map.type == MAP_VI) 144 el->el_line.cursor = el->el_line.buffer; 145 else 146 #endif /* KSHVI */ 147 el->el_line.cursor = el->el_line.lastchar; 148 149 return (CC_REFRESH); 150 } 151 152 153 /* hist_command() 154 * process a history command 155 */ 156 protected int 157 hist_command(EditLine *el, int argc, const Char **argv) 158 { 159 const Char *str; 160 int num; 161 HistEvent ev; 162 163 if (el->el_history.ref == NULL) 164 return (-1); 165 166 if (argc == 1 || Strcmp(argv[1], STR("list")) == 0) { 167 /* List history entries */ 168 169 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) 170 (void) fprintf(el->el_outfile, "%d %s", 171 el->el_history.ev.num, ct_encode_string(str, &el->el_scratch)); 172 return (0); 173 } 174 175 if (argc != 3) 176 return (-1); 177 178 num = (int)Strtol(argv[2], NULL, 0); 179 180 if (Strcmp(argv[1], STR("size")) == 0) 181 return history(el->el_history.ref, &ev, H_SETSIZE, num); 182 183 if (Strcmp(argv[1], STR("unique")) == 0) 184 return history(el->el_history.ref, &ev, H_SETUNIQUE, num); 185 186 return -1; 187 } 188 189 /* hist_enlargebuf() 190 * Enlarge history buffer to specified value. Called from el_enlargebufs(). 191 * Return 0 for failure, 1 for success. 192 */ 193 protected int 194 /*ARGSUSED*/ 195 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz) 196 { 197 Char *newbuf; 198 199 newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf)); 200 if (!newbuf) 201 return 0; 202 203 (void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf)); 204 205 el->el_history.last = newbuf + 206 (el->el_history.last - el->el_history.buf); 207 el->el_history.buf = newbuf; 208 el->el_history.sz = newsz; 209 210 return 1; 211 } 212 213 #ifdef WIDECHAR 214 protected wchar_t * 215 hist_convert(EditLine *el, int fn, ptr_t arg) 216 { 217 HistEventW ev; 218 if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1) 219 return NULL; 220 return ct_decode_string((const char *)(const void *)ev.str, 221 &el->el_scratch); 222 } 223 #endif