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106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
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/*
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FUNCTION
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<<wcsstr>>---find a wide-character substring
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ANSI_SYNOPSIS
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#include <wchar.h>
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wchar_t *wcsstr(const wchar_t *<[big]>, const wchar_t *<[little]>);
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TRAD_SYNOPSIS
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wchar_t *wcsstr(<[big]>, <[little]>
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const wchar_t *<[big]>;
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const wchar_t *<[little]>;
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DESCRIPTION
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The <<wcsstr>> function locates the first occurrence in the
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wide-character string pointed to by <[big]> of the sequence of
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wide characters (excluding the terminating null wide character) in the
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wide-character string pointed to by <[little]>.
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RETURNS
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On successful completion, <<wcsstr>> returns a pointer to the located
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wide-character string, or a null pointer if the wide-character string
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is not found.
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If <[little]> points to a wide-character string with zero length,
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the function returns <[big]>.
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PORTABILITY
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<<wcsstr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
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*/
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/* $NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */
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/*-
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* Copyright (c)1999 Citrus Project,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* citrus Id: wcsstr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
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*/
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#include <_ansi.h>
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#include <stddef.h>
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#include <wchar.h>
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wchar_t *
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_DEFUN (wcsstr, (big, little),
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_CONST wchar_t * big _AND
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_CONST wchar_t * little)
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{
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_CONST wchar_t *p;
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_CONST wchar_t *q;
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_CONST wchar_t *r;
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if (!*little)
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{
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/* LINTED interface specification */
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return (wchar_t *) big;
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}
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if (wcslen (big) < wcslen (little))
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return NULL;
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p = big;
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q = little;
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while (*p)
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{
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q = little;
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r = p;
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while (*q)
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{
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if (*r != *q)
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break;
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q++;
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r++;
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}
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if (!*q)
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{
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/* LINTED interface specification */
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return (wchar_t *) p;
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}
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p++;
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}
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return NULL;
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}
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