contrib/libedit/src/hist.c

   1 /*      $NetBSD: hist.c,v 1.34 2019/07/23 10:19:35 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 1.34 2019/07/23 10:19:35 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 <string.h>
  49 #include <vis.h>
  50
  51 #include "el.h"
  52
  53 /* hist_init():
  54  *      Initialization function.
  55  */
  56 libedit_private int
  57 hist_init(EditLine *el)
  58 {
  59
  60         el->el_history.fun = NULL;
  61         el->el_history.ref = NULL;
  62         el->el_history.buf = el_calloc(EL_BUFSIZ, sizeof(*el->el_history.buf));
  63         if (el->el_history.buf == NULL)
  64                 return -1;
  65         el->el_history.sz  = EL_BUFSIZ;
  66         el->el_history.last = el->el_history.buf;
  67         return 0;
  68 }
  69
  70
  71 /* hist_end():
  72  *      clean up history;
  73  */
  74 libedit_private void
  75 hist_end(EditLine *el)
  76 {
  77
  78         el_free(el->el_history.buf);
  79         el->el_history.buf = NULL;
  80 }
  81
  82
  83 /* hist_set():
  84  *      Set new history interface
  85  */
  86 libedit_private int
  87 hist_set(EditLine *el, hist_fun_t fun, void *ptr)
  88 {
  89
  90         el->el_history.ref = ptr;
  91         el->el_history.fun = fun;
  92         return 0;
  93 }
  94
  95
  96 /* hist_get():
  97  *      Get a history line and update it in the buffer.
  98  *      eventno tells us the event to get.
  99  */
 100 libedit_private el_action_t
 101 hist_get(EditLine *el)
 102 {
 103         const wchar_t *hp;
 104         int h;
 105         size_t blen, hlen;
 106
 107         if (el->el_history.eventno == 0) {      /* if really the current line */
 108                 (void) wcsncpy(el->el_line.buffer, el->el_history.buf,
 109                     el->el_history.sz);
 110                 el->el_line.lastchar = el->el_line.buffer +
 111                     (el->el_history.last - el->el_history.buf);
 112
 113 #ifdef KSHVI
 114                 if (el->el_map.type == MAP_VI)
 115                         el->el_line.cursor = el->el_line.buffer;
 116                 else
 117 #endif /* KSHVI */
 118                         el->el_line.cursor = el->el_line.lastchar;
 119
 120                 return CC_REFRESH;
 121         }
 122         if (el->el_history.ref == NULL)
 123                 return CC_ERROR;
 124
 125         hp = HIST_FIRST(el);
 126
 127         if (hp == NULL)
 128                 return CC_ERROR;
 129
 130         for (h = 1; h < el->el_history.eventno; h++)
 131                 if ((hp = HIST_NEXT(el)) == NULL)
 132                         goto out;
 133
 134         hlen = wcslen(hp) + 1;
 135         blen = (size_t)(el->el_line.limit - el->el_line.buffer);
 136         if (hlen > blen && !ch_enlargebufs(el, hlen))
 137                 goto out;
 138
 139         memcpy(el->el_line.buffer, hp, hlen * sizeof(*hp));
 140         el->el_line.lastchar = el->el_line.buffer + hlen - 1;
 141
 142         if (el->el_line.lastchar > el->el_line.buffer
 143             && el->el_line.lastchar[-1] == '\n')
 144                 el->el_line.lastchar--;
 145         if (el->el_line.lastchar > el->el_line.buffer
 146             && el->el_line.lastchar[-1] == ' ')
 147                 el->el_line.lastchar--;
 148 #ifdef KSHVI
 149         if (el->el_map.type == MAP_VI)
 150                 el->el_line.cursor = el->el_line.buffer;
 151         else
 152 #endif /* KSHVI */
 153                 el->el_line.cursor = el->el_line.lastchar;
 154
 155         return CC_REFRESH;
 156 out:
 157         el->el_history.eventno = h;
 158         return CC_ERROR;
 159
 160 }
 161
 162
 163 /* hist_command()
 164  *      process a history command
 165  */
 166 libedit_private int
 167 hist_command(EditLine *el, int argc, const wchar_t **argv)
 168 {
 169         const wchar_t *str;
 170         int num;
 171         HistEventW ev;
 172
 173         if (el->el_history.ref == NULL)
 174                 return -1;
 175
 176         if (argc == 1 || wcscmp(argv[1], L"list") == 0) {
 177                 size_t maxlen = 0;
 178                 char *buf = NULL;
 179                 int hno = 1;
 180                  /* List history entries */
 181
 182                 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) {
 183                         char *ptr =
 184                             ct_encode_string(str, &el->el_scratch);
 185                         size_t len = strlen(ptr);
 186                         if (len > 0 && ptr[len - 1] == '\n')
 187                                 ptr[--len] = '\0';
 188                         len = len * 4 + 1;
 189                         if (len >= maxlen) {
 190                                 maxlen = len + 1024;
 191                                 char *nbuf = el_realloc(buf, maxlen);
 192                                 if (nbuf == NULL) {
 193                                         el_free(buf);
 194                                         return -1;
 195                                 }
 196                                 buf = nbuf;
 197                         }
 198                         strvis(buf, ptr, VIS_NL);
 199                         (void) fprintf(el->el_outfile, "%d\t%s\n",
 200                             hno++, buf);
 201                 }
 202                 el_free(buf);
 203                 return 0;
 204         }
 205
 206         if (argc != 3)
 207                 return -1;
 208
 209         num = (int)wcstol(argv[2], NULL, 0);
 210
 211         if (wcscmp(argv[1], L"size") == 0)
 212                 return history_w(el->el_history.ref, &ev, H_SETSIZE, num);
 213
 214         if (wcscmp(argv[1], L"unique") == 0)
 215                 return history_w(el->el_history.ref, &ev, H_SETUNIQUE, num);
 216
 217         return -1;
 218 }
 219
 220 /* hist_enlargebuf()
 221  *      Enlarge history buffer to specified value. Called from el_enlargebufs().
 222  *      Return 0 for failure, 1 for success.
 223  */
 224 libedit_private int
 225 /*ARGSUSED*/
 226 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
 227 {
 228         wchar_t *newbuf;
 229
 230         newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf));
 231         if (!newbuf)
 232                 return 0;
 233
 234         (void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf));
 235
 236         el->el_history.last = newbuf +
 237                                 (el->el_history.last - el->el_history.buf);
 238         el->el_history.buf = newbuf;
 239         el->el_history.sz  = newsz;
 240
 241         return 1;
 242 }
 243
 244 libedit_private wchar_t *
 245 hist_convert(EditLine *el, int fn, void *arg)
 246 {
 247         HistEventW ev;
 248         if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1)
 249                 return NULL;
 250         return ct_decode_string((const char *)(const void *)ev.str,
 251             &el->el_scratch);
 252 }