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90 lines
3.5 KiB
90 lines
3.5 KiB
/**************************************************************************** |
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* libc/stdio/lib_ferror.c |
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* |
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* Copyright (C) 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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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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* |
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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 |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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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 <nuttx/config.h> |
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#include <stdio.h> |
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#include <errno.h> |
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#include <nuttx/fs/fs.h> |
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#if CONFIG_NFILE_STREAMS > 0 |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: ferror |
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* |
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* Description: |
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* This function will test if the last operation resulted in an eror. This |
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* is used to disambiguate EOF and error conditions. |
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* |
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* Return Value: |
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* A non-zero value is returned to indicate the error condition. |
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* |
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****************************************************************************/ |
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int ferror(FILE *stream) |
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{ |
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#if 0 |
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/* If an error is encountered by any of the C-buffered I/O functions, they |
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* should set the __FS_FLAG_ERROR in the fs_flags field of struct |
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* file_struct. |
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*/ |
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return (stream->fs_flags & __FS_FLAG_ERROR) != 0; |
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#else |
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/* However, nothing currenlty sets the __FS_FLAG_ERROR flag (that is a job |
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* for another day). The __FS_FLAG_EOF is set by operations that perform |
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* read operations. Since ferror() is probably only called to disambiguate |
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* the meaning of other functions that return EOF, to indicate either EOF or |
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* an error, just testing for not EOF is probably sufficient for now. |
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* |
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* This approach would not work if ferror() is called in other contexts. In |
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* those cases, ferror() will always report an error. |
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*/ |
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return (stream->fs_flags & __FS_FLAG_EOF) == 0; |
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#endif |
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} |
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#endif /* CONFIG_NFILE_STREAMS */ |
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