db_byteorder.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998, 1999, 2000
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char revid[] = "$Id: db__byteorder_8c-source.html,v 1.1 2008/06/08 10:17:21 sebdiaz Exp $";
#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"

/*
 * CDB___db_byteorder --
 *      Return if we need to do byte swapping, checking for illegal
 *      values.
 *
 * PUBLIC: int CDB___db_byteorder __P((DB_ENV *, int));
 */
int
CDB___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:
                CDB___db_err(dbenv,
            "unsupported byte order, only big and little-endian supported");
                return (EINVAL);
        }
        return (0);
}

---