fopen.c

Go to the documentation of this file.

/*
 * 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 EGNITE SOFTWARE GMBH 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 EGNITE
 * SOFTWARE GMBH 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>


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

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;

    for (i = 3; __iob[i]; i++)
        if (i >= FOPEN_MAX - 1) {
            errno = ENFILE;
            return 0;
        }

    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];
}