seek.c

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/*
 * 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
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/*
 * $Log$
 * Revision 1.3  2009/01/17 15:37:52  haraldkipp
 * Added some NUTASSERT macros to check function parameters.
 *
 * Revision 1.2  2009/01/17 11:26:38  haraldkipp
 * Getting rid of two remaining BSD types in favor of stdint.
 * Replaced 'u_int' by 'unsinged int' and 'uptr_t' by 'uintptr_t'.
 *
 * Revision 1.1  2005/08/05 11:17:53  olereinhardt
 * Added support for _seek, _tell, fseek, ftell functions
 *
 */

#include "nut_io.h"

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

#include <fs/fs.h>
#include <errno.h>

 
int _seek(int fd, long offset, int origin)
{
    NUTFILE *fp = (NUTFILE *) ((uintptr_t) fd);
    NUTDEVICE *dev;
    IOCTL_ARG3 conf;

    NUTASSERT(fp != NULL);

    conf.arg1 = (void*) fp;
    conf.arg2 = (void*) &offset;
    conf.arg3 = (void*) origin;
    
    dev = fp->nf_dev;
    if (dev != 0) {
        if ((*dev->dev_ioctl) (dev, FS_FILE_SEEK, &conf)) {
            return 0;
        } else {
            errno = EINVAL;
            return -1;
        }
    } else {
        errno = EINVAL;
        return -1;
    }
}