lib/libedit/hist.c

   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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#)hist.c   8.1 (Berkeley) 6/4/93
  33  * $NetBSD: hist.c,v 1.15 2003/11/01 23:36:39 christos Exp $"
  34  * $DragonFly: src/lib/libedit/hist.c,v 1.3 2005/11/13 11:58:30 corecode Exp $
  35  */
  36
  37 #include "config.h"
  38
  39 /*
  40  * hist.c: History access functions
  41  */
  42 #include <stdlib.h>
  43 #include "el.h"
  44
  45 /* hist_init():
  46  *      Initialization function.
  47  */
  48 protected int
  49 hist_init(EditLine *el)
  50 {
  51
  52         el->el_history.fun = NULL;
  53         el->el_history.ref = NULL;
  54         el->el_history.buf = (char *) el_malloc(EL_BUFSIZ);
  55         el->el_history.sz  = EL_BUFSIZ;
  56         if (el->el_history.buf == NULL)
  57                 return (-1);
  58         el->el_history.last = el->el_history.buf;
  59         return (0);
  60 }
  61
  62
  63 /* hist_end():
  64  *      clean up history;
  65  */
  66 protected void
  67 hist_end(EditLine *el)
  68 {
  69
  70         el_free((ptr_t) el->el_history.buf);
  71         el->el_history.buf = NULL;
  72 }
  73
  74
  75 /* hist_set():
  76  *      Set new history interface
  77  */
  78 protected int
  79 hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr)
  80 {
  81
  82         el->el_history.ref = ptr;
  83         el->el_history.fun = fun;
  84         return (0);
  85 }
  86
  87
  88 /* hist_get():
  89  *      Get a history line and update it in the buffer.
  90  *      eventno tells us the event to get.
  91  */
  92 protected el_action_t
  93 hist_get(EditLine *el)
  94 {
  95         const char *hp;
  96         int h;
  97
  98         if (el->el_history.eventno == 0) {      /* if really the current line */
  99                 (void) strncpy(el->el_line.buffer, el->el_history.buf,
 100                     el->el_history.sz);
 101                 el->el_line.lastchar = el->el_line.buffer +
 102                     (el->el_history.last - el->el_history.buf);
 103
 104 #ifdef KSHVI
 105                 if (el->el_map.type == MAP_VI)
 106                         el->el_line.cursor = el->el_line.buffer;
 107                 else
 108 #endif /* KSHVI */
 109                         el->el_line.cursor = el->el_line.lastchar;
 110
 111                 return (CC_REFRESH);
 112         }
 113         if (el->el_history.ref == NULL)
 114                 return (CC_ERROR);
 115
 116         hp = HIST_FIRST(el);
 117
 118         if (hp == NULL)
 119                 return (CC_ERROR);
 120
 121         for (h = 1; h < el->el_history.eventno; h++)
 122                 if ((hp = HIST_NEXT(el)) == NULL) {
 123                         el->el_history.eventno = h;
 124                         return (CC_ERROR);
 125                 }
 126         (void) strlcpy(el->el_line.buffer, hp,
 127                         (size_t)(el->el_line.limit - el->el_line.buffer));
 128         el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer);
 129
 130         if (el->el_line.lastchar > el->el_line.buffer
 131             && el->el_line.lastchar[-1] == '\n')
 132                 el->el_line.lastchar--;
 133         if (el->el_line.lastchar > el->el_line.buffer
 134             && el->el_line.lastchar[-1] == ' ')
 135                 el->el_line.lastchar--;
 136 #ifdef KSHVI
 137         if (el->el_map.type == MAP_VI)
 138                 el->el_line.cursor = el->el_line.buffer;
 139         else
 140 #endif /* KSHVI */
 141                 el->el_line.cursor = el->el_line.lastchar;
 142
 143         return (CC_REFRESH);
 144 }
 145
 146
 147 /* hist_command()
 148  *      process a history command
 149  */
 150 protected int
 151 hist_command(EditLine *el, int argc, const char **argv)
 152 {
 153         const char *str;
 154         int num;
 155         HistEvent ev;
 156
 157         if (el->el_history.ref == NULL)
 158                 return (-1);
 159
 160         if (argc == 1 || strcmp(argv[1], "list") == 0) {
 161                  /* List history entries */
 162
 163                 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
 164                         (void) fprintf(el->el_outfile, "%d %s",
 165                             el->el_history.ev.num, str);
 166                 return (0);
 167         }
 168
 169         if (argc != 3)
 170                 return (-1);
 171
 172         num = (int)strtol(argv[2], NULL, 0);
 173
 174         if (strcmp(argv[1], "size") == 0)
 175                 return history(el->el_history.ref, &ev, H_SETSIZE, num);
 176
 177         if (strcmp(argv[1], "unique") == 0)
 178                 return history(el->el_history.ref, &ev, H_SETUNIQUE, num);
 179
 180         return -1;
 181 }
 182
 183 /* hist_enlargebuf()
 184  *      Enlarge history buffer to specified value. Called from el_enlargebufs().
 185  *      Return 0 for failure, 1 for success.
 186  */
 187 protected int
 188 /*ARGSUSED*/
 189 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
 190 {
 191         char *newbuf;
 192
 193         newbuf = realloc(el->el_history.buf, newsz);
 194         if (!newbuf)
 195                 return 0;
 196
 197         (void) memset(&newbuf[oldsz], '\0', newsz - oldsz);
 198
 199         el->el_history.last = newbuf +
 200                                 (el->el_history.last - el->el_history.buf);
 201         el->el_history.buf = newbuf;
 202         el->el_history.sz  = newsz;
 203
 204         return 1;
 205 }