/*      $NetBSD: hist.c,v 1.34 2019/07/23 10:19:35 christos Exp $       */

/*-
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Christos Zoulas of Cornell University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include "config.h"
#if !defined(lint) && !defined(SCCSID)
#if 0
static char sccsid[] = "@(#)hist.c      8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: hist.c,v 1.34 2019/07/23 10:19:35 christos Exp $");
#endif
#endif /* not lint && not SCCSID */

/*
* hist.c: History access functions
*/
#include <stdlib.h>
#include <string.h>
#include <vis.h>

#include "el.h"

/* hist_init():
*      Initialization function.
*/
libedit_private int
hist_init(EditLine *el)
{

       el->el_history.fun = NULL;
       el->el_history.ref = NULL;
       el->el_history.buf = el_calloc(EL_BUFSIZ, sizeof(*el->el_history.buf));
       if (el->el_history.buf == NULL)
               return -1;
       el->el_history.sz  = EL_BUFSIZ;
       el->el_history.last = el->el_history.buf;
       return 0;
}


/* hist_end():
*      clean up history;
*/
libedit_private void
hist_end(EditLine *el)
{

       el_free(el->el_history.buf);
       el->el_history.buf = NULL;
}


/* hist_set():
*      Set new history interface
*/
libedit_private int
hist_set(EditLine *el, hist_fun_t fun, void *ptr)
{

       el->el_history.ref = ptr;
       el->el_history.fun = fun;
       return 0;
}


/* hist_get():
*      Get a history line and update it in the buffer.
*      eventno tells us the event to get.
*/
libedit_private el_action_t
hist_get(EditLine *el)
{
       const wchar_t *hp;
       int h;
       size_t blen, hlen;

       if (el->el_history.eventno == 0) {      /* if really the current line */
               (void) wcsncpy(el->el_line.buffer, el->el_history.buf,
                   el->el_history.sz);
               el->el_line.lastchar = el->el_line.buffer +
                   (el->el_history.last - el->el_history.buf);

#ifdef KSHVI
               if (el->el_map.type == MAP_VI)
                       el->el_line.cursor = el->el_line.buffer;
               else
#endif /* KSHVI */
                       el->el_line.cursor = el->el_line.lastchar;

               return CC_REFRESH;
       }
       if (el->el_history.ref == NULL)
               return CC_ERROR;

       hp = HIST_FIRST(el);

       if (hp == NULL)
               return CC_ERROR;

       for (h = 1; h < el->el_history.eventno; h++)
               if ((hp = HIST_NEXT(el)) == NULL)
                       goto out;

       hlen = wcslen(hp) + 1;
       blen = (size_t)(el->el_line.limit - el->el_line.buffer);
       if (hlen > blen && !ch_enlargebufs(el, hlen))
               goto out;

       memcpy(el->el_line.buffer, hp, hlen * sizeof(*hp));
       el->el_line.lastchar = el->el_line.buffer + hlen - 1;

       if (el->el_line.lastchar > el->el_line.buffer
           && el->el_line.lastchar[-1] == '\n')
               el->el_line.lastchar--;
       if (el->el_line.lastchar > el->el_line.buffer
           && el->el_line.lastchar[-1] == ' ')
               el->el_line.lastchar--;
#ifdef KSHVI
       if (el->el_map.type == MAP_VI)
               el->el_line.cursor = el->el_line.buffer;
       else
#endif /* KSHVI */
               el->el_line.cursor = el->el_line.lastchar;

       return CC_REFRESH;
out:
       el->el_history.eventno = h;
       return CC_ERROR;

}


/* hist_command()
*      process a history command
*/
libedit_private int
hist_command(EditLine *el, int argc, const wchar_t **argv)
{
       const wchar_t *str;
       int num;
       HistEventW ev;

       if (el->el_history.ref == NULL)
               return -1;

       if (argc == 1 || wcscmp(argv[1], L"list") == 0) {
               size_t maxlen = 0;
               char *buf = NULL;
               int hno = 1;
                /* List history entries */

               for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el)) {
                       char *ptr =
                           ct_encode_string(str, &el->el_scratch);
                       size_t len = strlen(ptr);
                       if (len > 0 && ptr[len - 1] == '\n')
                               ptr[--len] = '\0';
                       len = len * 4 + 1;
                       if (len >= maxlen) {
                               maxlen = len + 1024;
                               char *nbuf = el_realloc(buf, maxlen);
                               if (nbuf == NULL) {
                                       el_free(buf);
                                       return -1;
                               }
                               buf = nbuf;
                       }
                       strvis(buf, ptr, VIS_NL);
                       (void) fprintf(el->el_outfile, "%d\t%s\n",
                           hno++, buf);
               }
               el_free(buf);
               return 0;
       }

       if (argc != 3)
               return -1;

       num = (int)wcstol(argv[2], NULL, 0);

       if (wcscmp(argv[1], L"size") == 0)
               return history_w(el->el_history.ref, &ev, H_SETSIZE, num);

       if (wcscmp(argv[1], L"unique") == 0)
               return history_w(el->el_history.ref, &ev, H_SETUNIQUE, num);

       return -1;
}

/* hist_enlargebuf()
*      Enlarge history buffer to specified value. Called from el_enlargebufs().
*      Return 0 for failure, 1 for success.
*/
libedit_private int
/*ARGSUSED*/
hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
{
       wchar_t *newbuf;

       newbuf = el_realloc(el->el_history.buf, newsz * sizeof(*newbuf));
       if (!newbuf)
               return 0;

       (void) memset(&newbuf[oldsz], '\0', (newsz - oldsz) * sizeof(*newbuf));

       el->el_history.last = newbuf +
                               (el->el_history.last - el->el_history.buf);
       el->el_history.buf = newbuf;
       el->el_history.sz  = newsz;

       return 1;
}

libedit_private wchar_t *
hist_convert(EditLine *el, int fn, void *arg)
{
       HistEventW ev;
       if ((*(el)->el_history.fun)((el)->el_history.ref, &ev, fn, arg) == -1)
               return NULL;
       return ct_decode_string((const char *)(const void *)ev.str,
           &el->el_scratch);
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.