hist.c revision 1.8
1 /* $NetBSD: hist.c,v 1.8 2001/01/10 07:45:41 jdolecek 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if !defined(lint) && !defined(SCCSID) 41 #if 0 42 static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 __RCSID("$NetBSD: hist.c,v 1.8 2001/01/10 07:45:41 jdolecek Exp $"); 45 #endif 46 #endif /* not lint && not SCCSID */ 47 48 /* 49 * hist.c: History access functions 50 */ 51 #include "sys.h" 52 #include <stdlib.h> 53 #include "el.h" 54 55 /* hist_init(): 56 * Initialization function. 57 */ 58 protected int 59 hist_init(EditLine *el) 60 { 61 62 el->el_history.fun = NULL; 63 el->el_history.ref = NULL; 64 el->el_history.buf = (char *) el_malloc(EL_BUFSIZ); 65 el->el_history.sz = EL_BUFSIZ; 66 if (el->el_history.buf == NULL) 67 return (-1); 68 el->el_history.last = el->el_history.buf; 69 return (0); 70 } 71 72 73 /* hist_end(): 74 * clean up history; 75 */ 76 protected void 77 hist_end(EditLine *el) 78 { 79 80 el_free((ptr_t) el->el_history.buf); 81 el->el_history.buf = NULL; 82 } 83 84 85 /* hist_set(): 86 * Set new history interface 87 */ 88 protected int 89 hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr) 90 { 91 92 el->el_history.ref = ptr; 93 el->el_history.fun = fun; 94 return (0); 95 } 96 97 98 /* hist_get(): 99 * Get a history line and update it in the buffer. 100 * eventno tells us the event to get. 101 */ 102 protected el_action_t 103 hist_get(EditLine *el) 104 { 105 const char *hp; 106 int h; 107 108 if (el->el_history.eventno == 0) { /* if really the current line */ 109 (void) strncpy(el->el_line.buffer, el->el_history.buf, 110 el->el_history.sz); 111 el->el_line.lastchar = el->el_line.buffer + 112 (el->el_history.last - el->el_history.buf); 113 114 #ifdef KSHVI 115 if (el->el_map.type == MAP_VI) 116 el->el_line.cursor = el->el_line.buffer; 117 else 118 #endif /* KSHVI */ 119 el->el_line.cursor = el->el_line.lastchar; 120 121 return (CC_REFRESH); 122 } 123 if (el->el_history.ref == NULL) 124 return (CC_ERROR); 125 126 hp = HIST_FIRST(el); 127 128 if (hp == NULL) 129 return (CC_ERROR); 130 131 for (h = 1; h < el->el_history.eventno; h++) 132 if ((hp = HIST_NEXT(el)) == NULL) { 133 el->el_history.eventno = h; 134 return (CC_ERROR); 135 } 136 (void) strncpy(el->el_line.buffer, hp, 137 el->el_line.limit - el->el_line.buffer); 138 el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer); 139 140 if (el->el_line.lastchar > el->el_line.buffer) { 141 if (el->el_line.lastchar[-1] == '\n') 142 el->el_line.lastchar--; 143 if (el->el_line.lastchar[-1] == ' ') 144 el->el_line.lastchar--; 145 if (el->el_line.lastchar < el->el_line.buffer) 146 el->el_line.lastchar = el->el_line.buffer; 147 } 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 } 157 158 159 /* hist_list() 160 * List history entries 161 */ 162 protected int 163 /*ARGSUSED*/ 164 hist_list(EditLine *el, int argc, char **argv) 165 { 166 const char *str; 167 168 if (el->el_history.ref == NULL) 169 return (-1); 170 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) 171 (void) fprintf(el->el_outfile, "%d %s", 172 el->el_history.ev.num, str); 173 return (0); 174 } 175 176 /* hist_enlargebuf() 177 * Enlarge history buffer to specified value. Called from el_enlargebufs(). 178 * Return 0 for failure, 1 for success. 179 */ 180 protected int 181 /*ARGSUSED*/ 182 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz) 183 { 184 char *newbuf; 185 186 newbuf = realloc(el->el_history.buf, newsz); 187 if (!newbuf) 188 return 0; 189 190 (void) memset(&newbuf[oldsz], '\0', newsz - oldsz); 191 192 el->el_history.last = newbuf + 193 (el->el_history.last - el->el_history.buf); 194 el->el_history.buf = newbuf; 195 el->el_history.sz = newsz; 196 197 return 1; 198 } 199
Indexes created Thu Sep 25 16:09:42 GMT 2025