1/* ----------------------------------------------------------------------- *
2 *
3 *   Copyright 2011 Erwan Velu - All Rights Reserved
4 *
5 *   Permission is hereby granted, free of charge, to any person
6 *   obtaining a copy of this software and associated documentation
7 *   files (the "Software"), to deal in the Software without
8 *   restriction, including without limitation the rights to use,
9 *   copy, modify, merge, publish, distribute, sublicense, and/or
10 *   sell copies of the Software, and to permit persons to whom
11 *   the Software is furnished to do so, subject to the following
12 *   conditions:
13 *
14 *   The above copyright notice and this permission notice shall
15 *   be included in all copies or substantial portions of the Software.
16 *
17 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 *   OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * -----------------------------------------------------------------------
27 */
28
29#include <string.h>
30#include <stdlib.h>
31
32char *strreplace(const char *string, const char *string_to_replace,
33		 const char *string_to_insert)
34{
35    char *token = NULL;
36    char *out = NULL;
37
38    size_t slen, srlen, silen;
39
40    token = strstr(string, string_to_replace);
41    if (!token)
42	return strdup(string);
43
44    slen  = strlen(string);
45    srlen = strlen(string_to_replace);
46    silen = strlen(string_to_insert);
47
48    out = malloc(slen - srlen + silen + 1);
49    if (!out)
50	return NULL;
51
52    memcpy(out, string, token - string);
53    memcpy(out + (token - string), string_to_insert, silen);
54    memcpy(out + (token - string) + silen, token + srlen,
55	   slen - srlen - (token - string) + 1);
56
57    return out;
58}
59