hist.c revision 84334
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#if !defined(lint) && !defined(SCCSID) 40static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 6/4/93"; 41#endif /* not lint && not SCCSID */ 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: head/lib/libedit/hist.c 84334 2001-10-01 23:00:29Z obrien $"); 44 45/* 46 * hist.c: History access functions 47 */ 48#include "sys.h" 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 = (char *) el_malloc(EL_BUFSIZ); 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((ptr_t) 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, ptr_t 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.lastchar = el->el_line.buffer + strlen(el->el_line.buffer); 136 137 if (el->el_line.lastchar > el->el_line.buffer) { 138 if (el->el_line.lastchar[-1] == '\n') 139 el->el_line.lastchar--; 140 if (el->el_line.lastchar[-1] == ' ') 141 el->el_line.lastchar--; 142 if (el->el_line.lastchar < el->el_line.buffer) 143 el->el_line.lastchar = el->el_line.buffer; 144 } 145#ifdef KSHVI 146 if (el->el_map.type == MAP_VI) 147 el->el_line.cursor = el->el_line.buffer; 148 else 149#endif /* KSHVI */ 150 el->el_line.cursor = el->el_line.lastchar; 151 152 return (CC_REFRESH); 153} 154 155 156/* hist_list() 157 * List history entries 158 */ 159protected int 160/*ARGSUSED*/ 161hist_list(EditLine *el, int argc, char **argv) 162{ 163 const char *str; 164 165 if (el->el_history.ref == NULL) 166 return (-1); 167 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) 168 (void) fprintf(el->el_outfile, "%d %s", 169 el->el_history.ev.num, str); 170 return (0); 171} 172 173/* hist_enlargebuf() 174 * Enlarge history buffer to specified value. Called from el_enlargebufs(). 175 * Return 0 for failure, 1 for success. 176 */ 177protected int 178/*ARGSUSED*/ 179hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz) 180{ 181 char *newbuf; 182 183 newbuf = realloc(el->el_history.buf, newsz); 184 if (!newbuf) 185 return 0; 186 187 (void) memset(&newbuf[oldsz], '\0', newsz - oldsz); 188 189 el->el_history.last = newbuf + 190 (el->el_history.last - el->el_history.buf); 191 el->el_history.buf = newbuf; 192 el->el_history.sz = newsz; 193 194 return 1; 195} 196