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

/*
 * Copyright (C) 2001-2003 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
 * 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.
 *
 * For additional information see http://www.ethernut.de/
 *
 */

/*
 * $Log$
 * Revision 1.3  2009/02/13 14:52:05  haraldkipp
 * Include memdebug.h for heap management debugging support.
 *
 * Revision 1.2  2008/08/11 06:59:40  haraldkipp
 * BSD types replaced by stdint types (feature request #1282721).
 *
 * Revision 1.1.1.1  2003/05/09 14:40:26  haraldkipp
 * Initial using 3.2.1
 *
 * Revision 1.1  2003/02/04 17:49:05  harald
 * *** empty log message ***
 *
 */

#include "nut_io.h"

#include <errno.h>
#include <io.h>
#include <fcntl.h>
#include <stdlib.h>
#include <memdebug.h>

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

FILE *__iob[FOPEN_MAX] = { (FILE *) 1, (FILE *) 2, (FILE *) 3 };

/*!
 * \brief Open a stream.
 *
 * \param name The name of a registered device, optionally followed by a
 *             colon and a filename.
 * \param mode Specifies the access mode.
 *         \li \c "r"  Read only.
 *         \li \c "w"  Write only.
 *         \li \c "a"  Write only at the end of file.
 *         \li \c "r+" Read and write existing file.
 *         \li \c "w+" Read and write, destroys existing file contents.
 *         \li \c "a+" Read and write, preserves existing file contents.
 *         \li \c "b"  May be appended to any of the above strings to
 *                     specify binary access.
 *
 * \return A pointer to the open stream or a null pointer to indicate
 *         an error.
 */
FILE *fopen(const char *name, const char *mode)
{
    int mflags = _O_TEXT;
    uint_fast8_t i;

    /*
     * Translate file mode.
     */
    if ((mflags = _fmode(mode)) == EOF)
        return 0;

    /*
     * Find an empty slot.
     */
    for (i = 0; __iob[i];) {
        if (++i >= FOPEN_MAX) {
            errno = ENFILE;
            return NULL;
        }
    }

    if ((__iob[i] = malloc(sizeof(FILE))) == 0)
        return 0;

    if ((__iob[i]->iob_fd = _open(name, mflags)) == -1) {
        free(__iob[i]);
        __iob[i] = 0;
        return 0;
    }

    __iob[i]->iob_mode = mflags;
    __iob[i]->iob_flags = 0;
    __iob[i]->iob_unget = 0;

    return __iob[i];
}

/*@}*/