| /**************************************************************************** |
| * libs/libc/stdio/lib_fgetwc.c |
| * |
| * Copyright © 2005-2014 Rich Felker, et al. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <wchar.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #ifdef CONFIG_FILE_STREAM |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Name: fgetwc_unlocked |
| * |
| * Description: |
| * Get wide character from stream without lock the stream |
| * |
| * Input Parameters: |
| * f - Pointer to a FILE object that identifies an input stream, during |
| * the read operaiton, the stream will not be locked |
| * |
| * Returned Value: |
| * Return the character read is returned, |
| * Return WEOF is the sequence of bytes that read cannot be interpreted as |
| * a valid wide characted, and sets the errno to EILSEQ |
| * |
| ****************************************************************************/ |
| |
| wint_t fgetwc_unlocked(FAR FILE *f) |
| { |
| mbstate_t st; |
| wchar_t wc; |
| int c; |
| char b; |
| size_t l = -2; |
| |
| memset(&st, 0, sizeof(mbstate_t)); |
| |
| /* Convert character byte-by-byte */ |
| |
| while (l == -2) |
| { |
| c = getc_unlocked(f); |
| b = (char)c; |
| if (c < 0) |
| { |
| if (!mbsinit(&st)) |
| { |
| set_errno(EILSEQ); |
| } |
| |
| f->fs_flags |= __FS_FLAG_EOF; |
| return WEOF; |
| } |
| |
| l = mbrtowc(&wc, &b, 1, &st); |
| if (l == -1) |
| { |
| f->fs_flags |= __FS_FLAG_EOF; |
| return WEOF; |
| } |
| } |
| |
| return wc; |
| } |
| |
| /**************************************************************************** |
| * Name: fgetwc |
| * |
| * Description: |
| * Get wide character from stream |
| * |
| * Input Parameters: |
| * f - Pointer to a FILE object that identifies an input stream, the stream |
| * will be locked during the read operation |
| * |
| * Returned Value: |
| * Return the character read is returned, |
| * Return WEOF is the sequence of bytes that read cannot be interpreted as |
| * a valid wide characted, and sets the errno to EILSEQ |
| * |
| ****************************************************************************/ |
| |
| wint_t fgetwc(FAR FILE *f) |
| { |
| wint_t c; |
| flockfile(f); |
| c = fgetwc_unlocked(f); |
| funlockfile(f); |
| return c; |
| } |
| |
| #endif /* CONFIG_FILE_STREAM */ |