lib/libedit/hist.c

   1 /*      $NetBSD: hist.c,v 1.16 2009/12/30 22:37:40 christos 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 1.16 2009/12/30 22:37:40 christos 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 = el_malloc(EL_BUFSIZ * sizeof(*el->el_history.buf));
  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) Strncpy(el->el_line.buffer, hp,
 132                         (size_t)(el->el_line.limit - el->el_line.buffer));
 133         el->el_line.buffer[el->el_line.limit - el->el_line.buffer - 1] = '\0';
 134         el->el_line.lastchar = el->el_line.buffer + Strlen(el->el_line.buffer);
 135
 136         if (el->el_line.lastchar > el->el_line.buffer
 137             && el->el_line.lastchar[-1] == '\n')
 138                 el->el_line.lastchar--;
 139         if (el->el_line.lastchar > el->el_line.buffer
 140             && el->el_line.lastchar[-1] == ' ')
 141                 el->el_line.lastchar--;
 142 #ifdef KSHVI
 143         if (el->el_map.type == MAP_VI)
 144                 el->el_line.cursor = el->el_line.buffer;
 145         else
 146 #endif /* KSHVI */
 147                 el->el_line.cursor = el->el_line.lastchar;
 148
 149         return (CC_REFRESH);
 150 }
 151
 152
 153 /* hist_command()
 154  *      process a history command
 155  */
 156 protected int
 157 hist_command(EditLine *el, int argc, const Char **argv)
 158 {
 159         const Char *str;
 160         int num;
 161         HistEvent ev;
 162
 163         if (el->el_history.ref == NULL)
 164                 return (-1);
 165
 166         if (argc == 1 || Strcmp(argv[1], STR("list")) == 0) {
 167                  /* List history entries */
 168
 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, ct_encode_string(str, &el->el_scratch));
 172                 return (0);
 173         }
 174
 175         if (argc != 3)
 176                 return (-1);
 177
 178         num = (int)Strtol(argv[2], NULL, 0);
 179
 180         if (Strcmp(argv[1], STR("size")) == 0)
 181                 return history(el->el_history.ref, &ev, H_SETSIZE, num);
 182
 183         if (Strcmp(argv[1], STR("unique")) == 0)
 184                 return history(el->el_history.ref, &ev, H_SETUNIQUE, num);
 185
 186         return -1;
 187 }
 188
 189 /* hist_enlargebuf()
 190  *      Enlarge history buffer to specified value. Called from el_enlargebufs().
 191  *      Return 0 for failure, 1 for success.
 192  */
 193 protected int
 194 /*ARGSUSED*/
 195 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
 196 {
 197         Char *newbuf;
 198
 199         newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf));
 200         if (!newbuf)
 201                 return 0;
 202
 203         (void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf));
 204
 205         el->el_history.last = newbuf +
 206                                 (el->el_history.last - el->el_history.buf);
 207         el->el_history.buf = newbuf;
 208         el->el_history.sz  = newsz;
 209
 210         return 1;
 211 }
 212
 213 #ifdef WIDECHAR
 214 protected wchar_t *
 215 hist_convert(EditLine *el, int fn, ptr_t arg)
 216 {
 217         HistEventW ev;
 218         if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1)
 219                 return NULL;
 220         return ct_decode_string((const char *)(const void *)ev.str,
 221             &el->el_scratch);
 222 }
 223 #endif