db_byteorder.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:1k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: db_byteorder.c,v 11.4 2000/11/30 00:58:31 ubell 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
- #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,
- "unsupported byte order, only big and little-endian supported");
- return (EINVAL);
- }
- return (0);
- }