BSD 4_4 release

[unix-history] / usr / src / lib / libedit / hist.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;
}