freebsd-src/lib/libedit/hist.c
1995-05-30 05:51:47 +00:00

171 lines
4.6 KiB
C

/*-
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#if !defined(lint) && !defined(SCCSID)
static char sccsid[] = "@(#)hist.c 8.1 (Berkeley) 6/4/93";
#endif /* not lint && not SCCSID */
/*
* hist.c: History access functions
*/
#include "sys.h"
#include <stdlib.h>
#include "el.h"
/* hist_init():
* Initialization function.
*/
protected int
hist_init(el)
EditLine *el;
{
el->el_history.fun = NULL;
el->el_history.ref = NULL;
el->el_history.buf = (char *) el_malloc(EL_BUFSIZ);
el->el_history.last = el->el_history.buf;
return 0;
}
/* hist_end():
* clean up history;
*/
protected void
hist_end(el)
EditLine *el;
{
el_free((ptr_t) el->el_history.buf);
el->el_history.buf = NULL;
}
/* hist_set():
* Set new history interface
*/
protected int
hist_set(el, fun, ptr)
EditLine *el;
hist_fun_t fun;
ptr_t 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.
*/
protected el_action_t
hist_get(el)
EditLine *el;
{
const char *hp;
int h;
if (el->el_history.eventno == 0) { /* if really the current line */
(void) strncpy(el->el_line.buffer, el->el_history.buf, EL_BUFSIZ);
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) {
el->el_history.eventno = h;
return CC_ERROR;
}
(void) strncpy(el->el_line.buffer, hp, EL_BUFSIZ);
el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer);
if (el->el_line.lastchar > el->el_line.buffer) {
if (el->el_line.lastchar[-1] == '\n')
el->el_line.lastchar--;
if (el->el_line.lastchar[-1] == ' ')
el->el_line.lastchar--;
if (el->el_line.lastchar < el->el_line.buffer)
el->el_line.lastchar = el->el_line.buffer;
}
#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;
}
/* hist_list()
* List history entries
*/
protected int
/*ARGSUSED*/
hist_list(el, argc, argv)
EditLine *el;
int argc;
char **argv;
{
const char *str;
if (el->el_history.ref == NULL)
return -1;
for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
(void) fprintf(el->el_outfile, "%d %s", el->el_history.ev->num, str);
return 0;
}