/* 
 * Copyright (c) 1995-1994 The University of Utah and
 * the Computer Systems Laboratory at the University of Utah (CSL).
 * All rights reserved.
 *
 * Permission to use, copy, modify and distribute this software is hereby
 * granted provided that (1) source code retains these copyright, permission,
 * and disclaimer notices, and (2) redistributions including binaries
 * reproduce the notices in supporting documentation, and (3) all advertising
 * materials mentioning features or use of this software display the following
 * acknowledgement: ``This product includes software developed by the
 * Computer Systems Laboratory at the University of Utah.''
 *
 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
 * improvements that they make and grant CSL redistribution rights.
 *
 *      Author: Bryan Ford, University of Utah CSL
 */

#include <unistd.h>
#include <errno.h>

#include "dos_io.h"

int dos_seek(dos_fd_t fd, vm_offset_t offset, int whence, vm_offset_t *out_newpos)
{
	struct real_call_data real_call_data;
	int err;

	dos_init_rcd(&real_call_data);
	real_call_data.eax = 0x4200 | whence;
	real_call_data.ebx = fd;
	real_call_data.ecx = (unsigned)offset >> 16;
	real_call_data.edx = (unsigned)offset & 0xffff;
	real_int(0x21, &real_call_data);
	if (err = dos_check_err(&real_call_data))
		return err;
	*out_newpos = (real_call_data.edx << 16) | (real_call_data.eax & 0xffff);
	return 0;
}