minix/lib/libc/wchar/wcsstr.c
2010-04-19 15:20:24 +00:00

67 lines
1.9 KiB
C

/*-
* Copyright (c)1999 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* citrus Id: wcsstr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
*/
#include <assert.h>
#include <wchar.h>
wchar_t *
#ifdef WCSWCS
wcswcs(const wchar_t *big, const wchar_t *little)
#else
wcsstr(const wchar_t *big, const wchar_t *little)
#endif
{
const wchar_t *p;
const wchar_t *q;
const wchar_t *r;
assert(big != NULL);
assert(little != NULL);
if (!*little)
return (wchar_t *) big;
if (wcslen(big) < wcslen(little))
return NULL;
p = big;
q = little;
while (*p) {
q = little;
r = p;
while (*q) {
if (*r != *q)
break;
q++;
r++;
}
if (!*q)
return (wchar_t *) p;
p++;
}
return NULL;
}