windows-server-2003/base/crts/crtw32/stdio/clearerr.c

/***
*clearerr.c - clear error and eof flags
*
*       Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       defines clearerr() - clear error and eof flags from a stream
*
*Revision History:
*       11-30-83  RN    initial version
*       11-02-87  JCR   Multi-thread support
*       12-11-87  JCR   Added "_LOAD_DS" to declaration
*       05-31-88  PHG   Merged DLL and normal versions
*       06-01-88  JCR   Clear lowio flags as well as stdio flags
*       02-15-90  GJF   Fixed copyright and indents
*       03-16-90  GJF   Replaced _LOAD_DS with _CALLTYPE1 and added #include
*                       <cruntime.h>.
*       07-23-90  SBM   Replaced <assertm.h> by <assert.h>
*       10-02-90  GJF   New-style function declarator.
*       01-22-91  GJF   ANSI naming.
*       03-27-92  DJM   POSIX support
*       04-06-93  SKS   Replace _CRTAPI* with __cdecl
*       09-06-94  CFW   Replace MTHREAD with _MT.
*       02-06-94  CFW   assert -> _ASSERTE.
*       03-07-95  GJF   _[un]lock_str macros now take FILE * arg.
*       06-12-95  GJF   Replaced _osfile[] with _osfile() (macro referencing
*                       field in ioinfo struct).
*       07-28-95  GJF   Replaced _osfile() with _osfile_safe().
*       02-25-98  GJF   Exception-safe locking.
*       05-17-99  PML   Remove all Macintosh support.
*
*******************************************************************************/

#include <cruntime.h>
#include <stdio.h>
#include <dbgint.h>
#include <file2.h>
#include <mtdll.h>
#include <internal.h>
#ifndef _POSIX_
#include <msdos.h>
#endif

/***
*void clearerr(stream) - clear error and eof flags on a stream
*
*Purpose:
*       Resets the error and eof indicators for a stream to 0
*
*Entry:
*       FILE *stream - stream to set indicators on
*
*Exit:
*       No return value.
*       changes the _flag field of the FILE struct.
*
*Exceptions:
*
*******************************************************************************/

void __cdecl clearerr (
        FILE *stream
        )
{
        _ASSERTE(stream != NULL);

#ifdef  _MT
        _lock_str(stream);
        __try {
#endif

        /* Clear stdio level flags */
        stream->_flag &= ~(_IOERR|_IOEOF);

        /* Clear lowio level flags */

#ifndef _POSIX_
        _osfile_safe(_fileno(stream)) &= ~(FEOFLAG);
#endif

#ifdef  _MT
        }
        __finally {
            _unlock_str(stream);
        }
#endif

}