db/db/db_byteorder.c

	db_byteorder.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997
 *  Sleepycat Software.  All rights reserved.
 */
/*
 * Copyright (c) 1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#include "config.h"

#pragma ident   "%Z%%M% %I% %E% SMI"

#ifndef lint
static const char sccsid[] = "@(#)db_byteorder.c    10.4 (Sleepycat) 9/4/97";
static const char sccsi2[] = "%W% (Sun) %G%";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#ifdef HAVE_ENDIAN_H
#include <endian.h>
#if BYTE_ORDER == BIG_ENDIAN
#define WORDS_BIGENDIAN 1
#endif
#endif

#include <errno.h>
#endif

#include "db_int.h"
#include "common_ext.h"

/*
 * __db_byteorder --
 *  Return if we need to do byte swapping, checking for illegal
 *  values.
 *
 * PUBLIC: int __db_byteorder __P((DB_ENV *, int));
 */
int
__db_byteorder(dbenv, lorder)
    DB_ENV *dbenv;
    int lorder;
{
    switch (lorder) {
    case 0:
        break;
    case 1234:
#if defined(WORDS_BIGENDIAN)
        return (DB_SWAPBYTES);
#else
        break;
#endif
    case 4321:
#if defined(WORDS_BIGENDIAN)
        break;
#else
        return (DB_SWAPBYTES);
#endif
    default:
        __db_err(dbenv,
            "illegal byte order, only big and little-endian supported");
        return (EINVAL);
    }
    return (0);
}