diff options
Diffstat (limited to 'bdb/common/db_byteorder.c')
| -rw-r--r-- | bdb/common/db_byteorder.c | 50 |
1 files changed, 31 insertions, 19 deletions
diff --git a/bdb/common/db_byteorder.c b/bdb/common/db_byteorder.c index d089cfe4c99..d42d8e6a958 100644 --- a/bdb/common/db_byteorder.c +++ b/bdb/common/db_byteorder.c @@ -1,30 +1,42 @@ /*- * See the file LICENSE for redistribution information. * - * Copyright (c) 1996, 1997, 1998, 1999, 2000 + * Copyright (c) 1996-2002 * 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 $"; +static const char revid[] = "$Id: db_byteorder.c,v 11.8 2002/02/01 18:15:29 bostic 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_isbigendian -- + * Return 1 if big-endian (Motorola and Sparc), not little-endian + * (Intel and Vax). We do this work at run-time, rather than at + * configuration time so cross-compilation and general embedded + * system support is simpler. + * + * PUBLIC: int __db_isbigendian __P((void)); + */ +int +__db_isbigendian() +{ + union { /* From Harbison & Steele. */ + long l; + char c[sizeof(long)]; + } u; + + u.l = 1; + return (u.c[sizeof(long) - 1] == 1); +} /* * __db_byteorder -- @@ -38,21 +50,21 @@ __db_byteorder(dbenv, lorder) DB_ENV *dbenv; int lorder; { + int is_bigendian; + + is_bigendian = __db_isbigendian(); + switch (lorder) { case 0: break; case 1234: -#if defined(WORDS_BIGENDIAN) - return (DB_SWAPBYTES); -#else + if (is_bigendian) + return (DB_SWAPBYTES); break; -#endif case 4321: -#if defined(WORDS_BIGENDIAN) + if (!is_bigendian) + return (DB_SWAPBYTES); break; -#else - return (DB_SWAPBYTES); -#endif default: __db_err(dbenv, "unsupported byte order, only big and little-endian supported"); |