101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/*
|
|
FUNCTION
|
|
<<wcsstr>>---find a wide-character substring
|
|
|
|
SYNOPSIS
|
|
#include <wchar.h>
|
|
wchar_t *wcsstr(const wchar_t *__restrict <[big]>,
|
|
const wchar_t *__restrict <[little]>);
|
|
|
|
DESCRIPTION
|
|
The <<wcsstr>> function locates the first occurrence in the
|
|
wide-character string pointed to by <[big]> of the sequence of
|
|
wide characters (excluding the terminating null wide character) in the
|
|
wide-character string pointed to by <[little]>.
|
|
|
|
RETURNS
|
|
On successful completion, <<wcsstr>> returns a pointer to the located
|
|
wide-character string, or a null pointer if the wide-character string
|
|
is not found.
|
|
|
|
If <[little]> points to a wide-character string with zero length,
|
|
the function returns <[big]>.
|
|
|
|
PORTABILITY
|
|
<<wcsstr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
|
|
|
|
*/
|
|
|
|
/* $NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */
|
|
|
|
/*-
|
|
* 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 <_ansi.h>
|
|
#include <stddef.h>
|
|
#include <wchar.h>
|
|
|
|
wchar_t *
|
|
wcsstr (const wchar_t *__restrict big,
|
|
const wchar_t *__restrict little)
|
|
{
|
|
const wchar_t *p;
|
|
const wchar_t *q;
|
|
const wchar_t *r;
|
|
|
|
if (!*little)
|
|
{
|
|
/* LINTED interface specification */
|
|
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)
|
|
{
|
|
/* LINTED interface specification */
|
|
return (wchar_t *) p;
|
|
}
|
|
p++;
|
|
}
|
|
return NULL;
|
|
}
|