hist.c revision 84260
1/*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Christos Zoulas of Cornell University. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $NetBSD: hist.c,v 1.8 2001/01/10 07:45:41 jdolecek Exp $ 37 */ 38 39#include <sys/cdefs.h> 40__FBSDID("$FreeBSD: head/lib/libedit/hist.c 84260 2001-10-01 08:41:27Z obrien $"); 41#if !defined(lint) && !defined(SCCSID) 42static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 6/4/93"; 43#endif /* not lint && not SCCSID */ 44#include <sys/cdefs.h> 45__FBSDID("$FreeBSD: head/lib/libedit/hist.c 84260 2001-10-01 08:41:27Z obrien $"); 46 47/* 48 * hist.c: History access functions 49 */ 50#include "sys.h" 51#include <stdlib.h> 52#include "el.h" 53 54/* hist_init(): 55 * Initialization function. 56 */ 57protected int 58hist_init(EditLine *el) 59{ 60 61 el->el_history.fun = NULL; 62 el->el_history.ref = NULL; 63 el->el_history.buf = (char *) el_malloc(EL_BUFSIZ); 64 el->el_history.sz = EL_BUFSIZ; 65 if (el->el_history.buf == NULL) 66 return (-1); 67 el->el_history.last = el->el_history.buf; 68 return (0); 69} 70 71 72/* hist_end(): 73 * clean up history; 74 */ 75protected void 76hist_end(EditLine *el) 77{ 78 79 el_free((ptr_t) el->el_history.buf); 80 el->el_history.buf = NULL; 81} 82 83 84/* hist_set(): 85 * Set new history interface 86 */ 87protected int 88hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr) 89{ 90 91 el->el_history.ref = ptr; 92 el->el_history.fun = fun; 93 return (0); 94} 95 96 97/* hist_get(): 98 * Get a history line and update it in the buffer. 99 * eventno tells us the event to get. 100 */ 101protected el_action_t 102hist_get(EditLine *el) 103{ 104 const char *hp; 105 int h; 106 107 if (el->el_history.eventno == 0) { /* if really the current line */ 108 (void) strncpy(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 el->el_history.eventno = h; 133 return (CC_ERROR); 134 } 135 (void) strncpy(el->el_line.buffer, hp, 136 (size_t)(el->el_line.limit - el->el_line.buffer)); 137 el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer); 138 139 if (el->el_line.lastchar > el->el_line.buffer) { 140 if (el->el_line.lastchar[-1] == '\n') 141 el->el_line.lastchar--; 142 if (el->el_line.lastchar[-1] == ' ') 143 el->el_line.lastchar--; 144 if (el->el_line.lastchar < el->el_line.buffer) 145 el->el_line.lastchar = el->el_line.buffer; 146 } 147#ifdef KSHVI 148 if (el->el_map.type == MAP_VI) 149 el->el_line.cursor = el->el_line.buffer; 150 else 151#endif /* KSHVI */ 152 el->el_line.cursor = el->el_line.lastchar; 153 154 return (CC_REFRESH); 155} 156 157 158/* hist_list() 159 * List history entries 160 */ 161protected int 162/*ARGSUSED*/ 163hist_list(EditLine *el, int argc, char **argv) 164{ 165 const char *str; 166 167 if (el->el_history.ref == NULL) 168 return (-1); 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, str); 172 return (0); 173} 174 175/* hist_enlargebuf() 176 * Enlarge history buffer to specified value. Called from el_enlargebufs(). 177 * Return 0 for failure, 1 for success. 178 */ 179protected int 180/*ARGSUSED*/ 181hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz) 182{ 183 char *newbuf; 184 185 newbuf = realloc(el->el_history.buf, newsz); 186 if (!newbuf) 187 return 0; 188 189 (void) memset(&newbuf[oldsz], '\0', newsz - oldsz); 190 191 el->el_history.last = newbuf + 192 (el->el_history.last - el->el_history.buf); 193 el->el_history.buf = newbuf; 194 el->el_history.sz = newsz; 195 196 return 1; 197} 198