/* $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);
}