db2/common/db_byteorder.c

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1996, 1997, 1998
   5  *      Sleepycat Software.  All rights reserved.
   6  */
   7
   8 #include "config.h"
   9
  10 #ifndef lint
  11 static const char sccsid[] = "@(#)db_byteorder.c        10.5 (Sleepycat) 4/10/98";
  12 #endif /* not lint */
  13
  14 #ifndef NO_SYSTEM_INCLUDES
  15 #include <sys/types.h>
  16
  17 #ifdef HAVE_ENDIAN_H
  18 #include <endian.h>
  19 #if BYTE_ORDER == BIG_ENDIAN
  20 #define WORDS_BIGENDIAN 1
  21 #endif
  22 #endif
  23
  24 #include <errno.h>
  25 #endif
  26
  27 #include "db_int.h"
  28 #include "common_ext.h"
  29
  30 /*
  31  * __db_byteorder --
  32  *      Return if we need to do byte swapping, checking for illegal
  33  *      values.
  34  *
  35  * PUBLIC: int __db_byteorder __P((DB_ENV *, int));
  36  */
  37 int
  38 __db_byteorder(dbenv, lorder)
  39         DB_ENV *dbenv;
  40         int lorder;
  41 {
  42         switch (lorder) {
  43         case 0:
  44                 break;
  45         case 1234:
  46 #if defined(WORDS_BIGENDIAN)
  47                 return (DB_SWAPBYTES);
  48 #else
  49                 break;
  50 #endif
  51         case 4321:
  52 #if defined(WORDS_BIGENDIAN)
  53                 break;
  54 #else
  55                 return (DB_SWAPBYTES);
  56 #endif
  57         default:
  58                 __db_err(dbenv,
  59                     "illegal byte order, only big and little-endian supported");
  60                 return (EINVAL);
  61         }
  62         return (0);
  63 }