/*
 * strrepl.c
 * strrepl
 *
 * Copyright (c) 2004-2005 Denis Defreyne
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * 
 * - 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.
 * 
 * - The names of strrepl's contributors may not be used to endorse or
 *   promote products derived from this software without specific prior
 *   written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 <string.h>
#include <stdio.h>
#include <stdlib.h>

inline char *strrepl(char *str, char *oldstr, char *newstr)
{
	char *oldloc;
	char *s;
	
	/* find substring */
	oldloc = strstr(str, oldstr);
	if(!oldloc) return NULL;
	
	/* get new string */
	s = (char *)malloc(1,(strlen(str)-strlen(oldstr)+strlen(newstr))*sizeof(char));
	if(!s) return NULL;
	
	/* copy 1 */
	memcpy(s,str,oldloc-str);
	
	/* copy 2 */
	memcpy(oldloc-str+s,newstr,strlen(newstr));
	
	/* copy 3 */
	memcpy(oldloc-str+s+strlen(newstr),oldloc+strlen(oldstr),strlen(str)-(oldloc-str)-strlen(oldstr));
	
	return s;
}