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/*
* ProFTPD - mod_proxy String implementation
* Copyright (c) 2020 TJ Saunders
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#include "mod_proxy.h"
#include "proxy/str.h"
char *proxy_strnstr(const char *s1, const char *s2, size_t len) {
#if defined(HAVE_STRNSTR)
if (s1 == NULL ||
s2 == NULL ||
len == 0) {
return NULL;
}
/* strnstr(3) does not check this, but it should. */
if (s2[0] == '\0') {
return NULL;
}
return strnstr(s1, s2, len);
#else
register unsigned int i;
size_t s2_len;
if (s1 == NULL ||
s2 == NULL ||
len == 0) {
return NULL;
}
s2_len = strlen(s2);
if (s2_len == 0 ||
s2_len > len) {
return NULL;
}
for (i = 0; i <= (unsigned int) (len - s2_len); i++) {
if (s1[0] == s2[0] &&
strncmp(s1, s2, s2_len) == 0) {
return (char *) s1;
}
s1++;
}
return NULL;
#endif /* HAVE_STRNSTR */
}
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