124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_fgetwc.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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#include <errno.h>
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#include <string.h>
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#ifdef CONFIG_FILE_STREAM
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: fgetwc_unlocked
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*
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* Description:
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* Get wide character from stream without lock the stream
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*
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* Input Parameters:
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* f - Pointer to a FILE object that identifies an input stream, during
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* the read operaiton, the stream will not be locked
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*
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* Returned Value:
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* Return the character read is returned,
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* Return WEOF is the sequence of bytes that read cannot be interpreted as
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* a valid wide characted, and sets the errno to EILSEQ
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*
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****************************************************************************/
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wint_t fgetwc_unlocked(FAR FILE *f)
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{
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mbstate_t st;
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wchar_t wc;
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int c;
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char b;
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size_t l = -2;
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memset(&st, 0, sizeof(mbstate_t));
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/* Convert character byte-by-byte */
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while (l == -2)
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{
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c = getc_unlocked(f);
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b = (char)c;
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if (c < 0)
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{
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if (!mbsinit(&st))
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{
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set_errno(EILSEQ);
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}
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f->fs_flags |= __FS_FLAG_EOF;
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return WEOF;
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}
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l = mbrtowc(&wc, &b, 1, &st);
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if (l == -1)
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{
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f->fs_flags |= __FS_FLAG_EOF;
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return WEOF;
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}
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}
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return wc;
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}
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/****************************************************************************
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* Name: fgetwc
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*
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* Description:
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* Get wide character from stream
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*
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* Input Parameters:
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* f - Pointer to a FILE object that identifies an input stream, the stream
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* will be locked during the read operation
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*
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* Returned Value:
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* Return the character read is returned,
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* Return WEOF is the sequence of bytes that read cannot be interpreted as
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* a valid wide characted, and sets the errno to EILSEQ
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*
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****************************************************************************/
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wint_t fgetwc(FAR FILE *f)
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{
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wint_t c;
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flockfile(f);
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c = fgetwc_unlocked(f);
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funlockfile(f);
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return c;
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}
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#endif /* CONFIG_FILE_STREAM */
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