lib/libedit/hist.c

   1 /*      $OpenBSD: hist.c,v 1.18 2017/04/12 18:24:37 tb Exp $    */
   2 /*      $NetBSD: hist.c,v 1.28 2016/04/11 00:50:13 christos Exp $       */
   3
   4 /*-
   5  * Copyright (c) 1992, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Christos Zoulas of Cornell University.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "config.h"
  37
  38 /*
  39  * hist.c: History access functions
  40  */
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #include "el.h"
  45
  46 /* hist_init():
  47  *      Initialization function.
  48  */
  49 protected int
  50 hist_init(EditLine *el)
  51 {
  52
  53         el->el_history.fun = NULL;
  54         el->el_history.ref = NULL;
  55         el->el_history.buf = reallocarray(NULL, EL_BUFSIZ,
  56             sizeof(*el->el_history.buf));
  57         el->el_history.sz  = EL_BUFSIZ;
  58         if (el->el_history.buf == NULL)
  59                 return -1;
  60         el->el_history.last = el->el_history.buf;
  61         return 0;
  62 }
  63
  64
  65 /* hist_end():
  66  *      clean up history;
  67  */
  68 protected void
  69 hist_end(EditLine *el)
  70 {
  71
  72         free(el->el_history.buf);
  73         el->el_history.buf = NULL;
  74 }
  75
  76
  77 /* hist_set():
  78  *      Set new history interface
  79  */
  80 protected int
  81 hist_set(EditLine *el, hist_fun_t fun, void *ptr)
  82 {
  83
  84         el->el_history.ref = ptr;
  85         el->el_history.fun = fun;
  86         return 0;
  87 }
  88
  89
  90 /* hist_get():
  91  *      Get a history line and update it in the buffer.
  92  *      eventno tells us the event to get.
  93  */
  94 protected el_action_t
  95 hist_get(EditLine *el)
  96 {
  97         const wchar_t *hp;
  98         int h;
  99
 100         if (el->el_history.eventno == 0) {      /* if really the current line */
 101                 (void) wcsncpy(el->el_line.buffer, el->el_history.buf,
 102                     el->el_history.sz);
 103                 el->el_line.lastchar = el->el_line.buffer +
 104                     (el->el_history.last - el->el_history.buf);
 105
 106 #ifdef KSHVI
 107                 if (el->el_map.type == MAP_VI)
 108                         el->el_line.cursor = el->el_line.buffer;
 109                 else
 110 #endif /* KSHVI */
 111                         el->el_line.cursor = el->el_line.lastchar;
 112
 113                 return CC_REFRESH;
 114         }
 115         if (el->el_history.ref == NULL)
 116                 return CC_ERROR;
 117
 118         hp = HIST_FIRST(el);
 119
 120         if (hp == NULL)
 121                 return CC_ERROR;
 122
 123         for (h = 1; h < el->el_history.eventno; h++)
 124                 if ((hp = HIST_NEXT(el)) == NULL) {
 125                         el->el_history.eventno = h;
 126                         return CC_ERROR;
 127                 }
 128         (void) wcsncpy(el->el_line.buffer, hp,
 129                         (size_t)(el->el_line.limit - el->el_line.buffer));
 130         el->el_line.buffer[el->el_line.limit - el->el_line.buffer - 1] = '\0';
 131         el->el_line.lastchar = el->el_line.buffer + wcslen(el->el_line.buffer);
 132
 133         if (el->el_line.lastchar > el->el_line.buffer
 134             && el->el_line.lastchar[-1] == '\n')
 135                 el->el_line.lastchar--;
 136         if (el->el_line.lastchar > el->el_line.buffer
 137             && el->el_line.lastchar[-1] == ' ')
 138                 el->el_line.lastchar--;
 139 #ifdef KSHVI
 140         if (el->el_map.type == MAP_VI)
 141                 el->el_line.cursor = el->el_line.buffer;
 142         else
 143 #endif /* KSHVI */
 144                 el->el_line.cursor = el->el_line.lastchar;
 145
 146         return CC_REFRESH;
 147 }
 148
 149
 150 /* hist_command()
 151  *      process a history command
 152  */
 153 protected int
 154 hist_command(EditLine *el, int argc, const wchar_t **argv)
 155 {
 156         const wchar_t *str;
 157         int num;
 158         HistEvent ev;
 159
 160         if (el->el_history.ref == NULL)
 161                 return -1;
 162
 163         if (argc == 1 || wcscmp(argv[1], L"list") == 0) {
 164                  /* List history entries */
 165
 166                 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
 167                         (void) fprintf(el->el_outfile, "%d %s",
 168                             el->el_history.ev.num, ct_encode_string(str, &el->el_scratch));
 169                 return 0;
 170         }
 171
 172         if (argc != 3)
 173                 return -1;
 174
 175         num = (int)wcstol(argv[2], NULL, 0);
 176
 177         if (wcscmp(argv[1], L"size") == 0)
 178                 return history(el->el_history.ref, &ev, H_SETSIZE, num);
 179
 180         if (wcscmp(argv[1], L"unique") == 0)
 181                 return history(el->el_history.ref, &ev, H_SETUNIQUE, num);
 182
 183         return -1;
 184 }
 185
 186 /* hist_enlargebuf()
 187  *      Enlarge history buffer to specified value. Called from el_enlargebufs().
 188  *      Return 0 for failure, 1 for success.
 189  */
 190 protected int
 191 /*ARGSUSED*/
 192 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
 193 {
 194         wchar_t *newbuf;
 195
 196         newbuf = recallocarray(el->el_history.buf, oldsz, newsz,
 197             sizeof(*newbuf));
 198         if (!newbuf)
 199                 return 0;
 200
 201         el->el_history.last = newbuf +
 202                                 (el->el_history.last - el->el_history.buf);
 203         el->el_history.buf = newbuf;
 204         el->el_history.sz  = newsz;
 205
 206         return 1;
 207 }
 208
 209 protected wchar_t *
 210 hist_convert(EditLine *el, int fn, void *arg)
 211 {
 212         HistEventW ev;
 213         if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1)
 214                 return NULL;
 215         return ct_decode_string((const char *)(const void *)ev.str,
 216             &el->el_scratch);
 217 }