text: /*	$NetBSD: hist.c,v 1.24 2016/02/16 22:53:14 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 1.24 2016/02/16 22:53:14 christos Exp $");
  #endif
  #endif /* not lint && not SCCSID */
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: releng/11.1/lib/libedit/hist.c 313981 2017-02-20 03:33:59Z pfg $");
  
  /*
   * hist.c: History access functions
   */
  #include <stdlib.h>
  #include <string.h>
  
  #include "el.h"
  
  /* hist_init():
   *	Initialization function.
   */
  protected int
  hist_init(EditLine *el)
  {
  
  	el->el_history.fun = NULL;
  	el->el_history.ref = NULL;
  	el->el_history.buf = el_malloc(EL_BUFSIZ * sizeof(*el->el_history.buf));
  	el->el_history.sz  = EL_BUFSIZ;
  	if (el->el_history.buf == NULL)
  		return -1;
  	el->el_history.last = el->el_history.buf;
  	return 0;
  }
  
  
  /* hist_end():
   *	clean up history;
   */
  protected void
  hist_end(EditLine *el)
  {
  
  	el_free(el->el_history.buf);
  	el->el_history.buf = NULL;
  }
  
  
  /* hist_set():
   *	Set new history interface
   */
  protected 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.
   */
  protected el_action_t
  hist_get(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->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) {
  			el->el_history.eventno = h;
  			return CC_ERROR;
  		}
  	(void) Strncpy(el->el_line.buffer, hp,
  			(size_t)(el->el_line.limit - el->el_line.buffer));
  	el->el_line.buffer[el->el_line.limit - el->el_line.buffer - 1] = '\0';
  	el->el_line.lastchar = el->el_line.buffer + Strlen(el->el_line.buffer);
  
  	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;
  }
  
  
  /* hist_command()
   *	process a history command
   */
  protected int
  hist_command(EditLine *el, int argc, const Char **argv)
  {
  	const Char *str;
  	int num;
  	TYPE(HistEvent) ev;
  
  	if (el->el_history.ref == NULL)
  		return -1;
  
  	if (argc == 1 || Strcmp(argv[1], STR("list")) == 0) {
  		 /* List history entries */
  
  		for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
  			(void) fprintf(el->el_outfile, "%d %s",
  			    el->el_history.ev.num, ct_encode_string(str, &el->el_scratch));
  		return 0;
  	}
  
  	if (argc != 3)
  		return -1;
  
  	num = (int)Strtol(argv[2], NULL, 0);
  
  	if (Strcmp(argv[1], STR("size")) == 0)
  		return FUNW(history)(el->el_history.ref, &ev, H_SETSIZE, num);
  
  	if (Strcmp(argv[1], STR("unique")) == 0)
  		return FUNW(history)(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.
   */
  protected int
  /*ARGSUSED*/
  hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
  {
  	Char *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;
  }
  
  #ifdef WIDECHAR
  protected 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);
  }
  #endif
  