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Diffstat (limited to 'nuttx/libc/stdio/lib_ferror.c')
-rw-r--r-- | nuttx/libc/stdio/lib_ferror.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/nuttx/libc/stdio/lib_ferror.c b/nuttx/libc/stdio/lib_ferror.c new file mode 100644 index 000000000..a977394cb --- /dev/null +++ b/nuttx/libc/stdio/lib_ferror.c @@ -0,0 +1,90 @@ +/**************************************************************************** + * libc/stdio/lib_ferror.c + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 + * COPYRIGHT OWNER 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdio.h> +#include <errno.h> + +#include <nuttx/fs/fs.h> + +#if CONFIG_NFILE_STREAMS > 0 + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: ferror + * + * Description: + * This function will test if the last operation resulted in an eror. This + * is used to disambiguate EOF and error conditions. + * + * Return Value: + * A non-zero value is returned to indicate the error condition. + * + ****************************************************************************/ + +int ferror(FILE *stream) +{ +#if 0 + /* If an error is encountered by any of the C-buffered I/O functions, they + * should set the __FS_FLAG_ERROR in the fs_flags field of struct + * file_struct. + */ + + return (stream->fs_flags & __FS_FLAG_ERROR) != 0; +#else + /* However, nothing currenlty sets the __FS_FLAG_ERROR flag (that is a job + * for another day). The __FS_FLAG_EOF is set by operations that perform + * read operations. Since ferror() is probably only called to disambiguate + * the meaning of other functions that return EOF, to indicate either EOF or + * an error, just testing for not EOF is probably sufficient for now. + * + * This approach would not work if ferror() is called in other contexts. In + * those cases, ferror() will always report an error. + */ + + return (stream->fs_flags & __FS_FLAG_EOF) == 0; +#endif +} + +#endif /* CONFIG_NFILE_STREAMS */ + |