72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/****************************************************************************
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* libs/libc/wchar/lib_wcscspn.c
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*
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* SPDX-License-Identifier: MIT
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* SPDX-FileCopyrightText: 2005-2014 Rich Felker, et al.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <wchar.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: wcscspn
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*
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* Description:
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* Get span until character in wide string. scans "s" for the first
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* occurrence of any of the wide characters that are part of "c".
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*
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* Input Parameters:
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* s - the wchar string to be scanned
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* c - the wchar string containing the characters to match.
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*
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* Returned Value:
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* Return the number of wide characters of "s" read before this first
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* occurrence.
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*
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****************************************************************************/
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size_t wcscspn(FAR const wchar_t *s, FAR const wchar_t *c)
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{
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FAR const wchar_t *a;
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if (!c[0])
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{
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return wcslen(s);
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}
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if (!c[1])
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{
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return (s = wcschr(a = s, *c)) ? s - a : wcslen(a);
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}
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for (a = s; *s && !wcschr(c, *s); s++);
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return s - a;
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}
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