notmuch/compat/strcasestr.c

/*
 * slow simplistic reimplementation of strcasestr for systems that
 * don't include it in their library
 *
 * based on a GPL implementation in OpenTTD found under GPL v2
 *
 * 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, version 2.
 *
 * 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, Fifth Floor, Boston, MA
 * 02110-1301, USA.  */

/* Imported into notmuch by Dirk Hohndel - original author unknown. */

#include <string.h>

#include "compat.h"

char *
strcasestr (const char *haystack, const char *needle)
{
    size_t hay_len = strlen (haystack);
    size_t needle_len = strlen (needle);

    while (hay_len >= needle_len) {
	if (strncasecmp (haystack, needle, needle_len) == 0)
	    return (char *) haystack;

	haystack++;
	hay_len--;
    }

    return NULL;
}