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Pastable version of str_replace

<pre class='prettyprint' language='c'>char * str_replace(char *str, char *old, char *new) { int i, count = 0; int newlen = strlen(new); int oldlen = strlen(old); for (i = 0; str[i]; ++i) if (strstr(&amp;str[i], old) == &amp;str[i]) ++count, i += oldlen - 1; char *ret = (char *) calloc(i + 1 + count * (newlen - oldlen), sizeof(char)); if (!ret) return; i = 0; while (*str) if (strstr(str, old) == str) strcpy(&amp;ret[i], new), i += newlen, str += oldlen; else ret[i++] = *str++; ret[i] = '\0'; return ret; }</pre> <a href="http://www.refactormycode.com/codes/930-str_replace" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>