lib/libedit/hist.c

   1 /*      $NetBSD: hist.c,v 1.14 2003/08/07 16:44:31 agc 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 1.14 2003/08/07 16:44:31 agc 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 = (char *) el_malloc(EL_BUFSIZ);
  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) strlcpy(el->el_line.buffer, hp,
 132                         (size_t)(el->el_line.limit - el->el_line.buffer));
 133         el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer);
 134
 135         if (el->el_line.lastchar > el->el_line.buffer
 136             && el->el_line.lastchar[-1] == '\n')
 137                 el->el_line.lastchar--;
 138         if (el->el_line.lastchar > el->el_line.buffer
 139             && el->el_line.lastchar[-1] == ' ')
 140                 el->el_line.lastchar--;
 141 #ifdef KSHVI
 142         if (el->el_map.type == MAP_VI)
 143                 el->el_line.cursor = el->el_line.buffer;
 144         else
 145 #endif /* KSHVI */
 146                 el->el_line.cursor = el->el_line.lastchar;
 147
 148         return (CC_REFRESH);
 149 }
 150
 151
 152 /* hist_command()
 153  *      process a history command
 154  */
 155 protected int
 156 hist_command(EditLine *el, int argc, const char **argv)
 157 {
 158         const char *str;
 159         int num;
 160         HistEvent ev;
 161
 162         if (el->el_history.ref == NULL)
 163                 return (-1);
 164
 165         if (argc == 1 || strcmp(argv[1], "list") == 0) {
 166                  /* List history entries */
 167
 168                 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
 169                         (void) fprintf(el->el_outfile, "%d %s",
 170                             el->el_history.ev.num, str);
 171                 return (0);
 172         }
 173
 174         if (argc != 3)
 175                 return (-1);
 176
 177         num = (int)strtol(argv[2], NULL, 0);
 178
 179         if (strcmp(argv[1], "size") == 0)
 180                 return history(el->el_history.ref, &ev, H_SETSIZE, num);
 181
 182         if (strcmp(argv[1], "unique") == 0)
 183                 return history(el->el_history.ref, &ev, H_SETUNIQUE, num);
 184
 185         return -1;
 186 }
 187
 188 /* hist_enlargebuf()
 189  *      Enlarge history buffer to specified value. Called from el_enlargebufs().
 190  *      Return 0 for failure, 1 for success.
 191  */
 192 protected int
 193 /*ARGSUSED*/
 194 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
 195 {
 196         char *newbuf;
 197
 198         newbuf = realloc(el->el_history.buf, newsz);
 199         if (!newbuf)
 200                 return 0;
 201
 202         (void) memset(&newbuf[oldsz], '\0', newsz - oldsz);
 203
 204         el->el_history.last = newbuf +
 205                                 (el->el_history.last - el->el_history.buf);
 206         el->el_history.buf = newbuf;
 207         el->el_history.sz  = newsz;
 208
 209         return 1;
 210 }