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Diffstat (limited to 'newlib/libc/string/wcsstr.c')
-rw-r--r-- | newlib/libc/string/wcsstr.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/newlib/libc/string/wcsstr.c b/newlib/libc/string/wcsstr.c new file mode 100644 index 000000000..6a61ac3ae --- /dev/null +++ b/newlib/libc/string/wcsstr.c @@ -0,0 +1,104 @@ +/* +FUNCTION + <<wcsstr>>---find a wide-character substring + +ANSI_SYNOPSIS + #include <wchar.h> + wchar_t *wcsstr(const wchar_t *<[big]>, const wchar_t *<[little]>); + +TRAD_SYNOPSIS + wchar_t *wcsstr(<[big]>, <[little]> + const wchar_t *<[big]>; + const wchar_t *<[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 <wchar.h> + +wchar_t * +_DEFUN (wcsstr, (big, little), + _CONST wchar_t * big _AND + _CONST wchar_t * 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; +} |