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//===========================================================================

//

//      fseek.cxx

//

//      Implementation of C library file positioning functions as per ANSI 7.9.9

//

//===========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//===========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     nickg

// Contributors:  

// Date:          2000-07-12

// Purpose:       Implements ISO C file positioning functions

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

//===========================================================================

// CONFIGURATION

#include <pkgconf/libc_stdio.h>   // Configuration header

#include <cyg/infra/cyg_type.h>     // Common project-wide type definitions

#include <cyg/infra/cyg_ass.h>      // Assertion support

#include <cyg/infra/cyg_trac.h>     // Tracing support

#include <stddef.h>                 // NULL and size_t from compiler

#include <errno.h>                  // Error codes

#include <stdio.h>                  // header for fseek() etc.

#include <cyg/libc/stdio/stdiofiles.hxx> // C library files

#include <cyg/libc/stdio/stream.hxx>     // C library streams

//========================================================================

// ISO C 7.9.9 File positioning functions

externC int

fgetpos( FILE * stream , fpos_t *pos  )

{

    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;

    Cyg_ErrNo err;

    int ret = 0;

    CYG_REPORT_FUNCNAME( "fgetpos" );

    err = real_stream->get_position( pos );

    if( err != ENOERR )

    {

        errno = err;

        ret = -1;

    }

    CYG_REPORT_RETVAL( ret );

    return ret;

}

externC int

fseek( FILE * stream , long int offset , int whence  )

{

    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;

    Cyg_ErrNo err;

    int ret = 0;

    CYG_REPORT_FUNCNAME( "fgetpos" );

    err = real_stream->set_position( (fpos_t)offset, whence );

    if( err != ENOERR )

    {

        errno = err;

        ret = -1;

    }

    CYG_REPORT_RETVAL( ret );

    return ret;

}

externC int

fsetpos( FILE * stream , const fpos_t * pos )

{

    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;

    Cyg_ErrNo err;

    int ret = 0;

    CYG_REPORT_FUNCNAME( "fgetpos" );

    err = real_stream->set_position( *pos, SEEK_SET );

    if( err != ENOERR )

    {

        errno = err;

        ret = -1;

    }

    CYG_REPORT_RETVAL( ret );

    return ret;

}

externC long int

ftell( FILE * stream  )

{

    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;

    Cyg_ErrNo err;

    long int ret = 0;

    fpos_t pos;

    CYG_REPORT_FUNCNAME( "ftell" );

    err = real_stream->get_position( &pos );

    if( err != ENOERR )

    {

        errno = err;

        ret = -1;

    }

    else ret = pos;

    CYG_REPORT_RETVAL( ret );

    return ret;

}

externC void

rewind( FILE * stream  )

{

    Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;

    (void)fseek( stream, 0L, SEEK_SET );

    real_stream->set_error( ENOERR );

}

// EOF fseek.cxx