2.3-InternetRadio/nutos/nut/crt/fpurge.c

/*
 * Copyright (C) 2001-2004 by egnite Software GmbH. All rights reserved.
 *
 * 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 of the copyright holders nor the names of
 *    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
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/*
 * $Log$
 * Revision 1.2  2009/01/17 15:37:52  haraldkipp
 * Added some NUTASSERT macros to check function parameters.
 *
 * Revision 1.1  2004/03/03 18:09:32  drsung
 * Added function 'fpurge' to crt.
 *
 *
 */

#include "nut_io.h"

#include <sys/nutdebug.h>
#include <io.h>

/*!
 * \addtogroup xgCrtStdio
 */
/*@{*/

/*!
 * \brief Purge a stream, i.e. discards the input buffer.
 *
 * \param stream Pointer to a previously opened stream.
 *
 * \return 0 if the buffer was successfully purged, EOF if an error
 *         occured.
 *
 * \warning The function will not check, if the stream pointer points
 *          to a valid stream.
 */
int fpurge(FILE * stream)
{
    NUTASSERT(stream != NULL);
    if (_read(stream->iob_fd, 0, 0))
        return EOF;
    return 0;
}

/*@}*/