diff options
Diffstat (limited to 'bits/byteswap.h')
| -rw-r--r-- | bits/byteswap.h | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/bits/byteswap.h b/bits/byteswap.h index 38d8540130..949ed0bc9d 100644 --- a/bits/byteswap.h +++ b/bits/byteswap.h @@ -1,5 +1,5 @@ /* Macros to swap the order of bytes in integer values. - Copyright (C) 1997, 1998, 2000, 2001, 2002 Free Software Foundation, Inc. + Copyright (C) 1997,1998,2000,2001,2002,2005 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -25,32 +25,35 @@ #define _BITS_BYTESWAP_H 1 /* Swap bytes in 16 bit value. */ +#define __bswap_constant_16(x) \ + ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) + #ifdef __GNUC__ # define __bswap_16(x) \ (__extension__ \ - ({ unsigned short int __bsx = (x); \ - ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); })) + ({ unsigned short int __bsx = (x); __bswap_constant_16 (__bsx); })) #else static __inline unsigned short int __bswap_16 (unsigned short int __bsx) { - return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); + return __bswap_constant_16 (__bsx); } #endif /* Swap bytes in 32 bit value. */ +#define __bswap_constant_32(x) \ + ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ + (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) + #ifdef __GNUC__ # define __bswap_32(x) \ - (__extension__ \ - ({ unsigned int __bsx = (x); \ - ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \ - (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); })) + (__extension__ \ + ({ register unsigned int __bsx = (x); __bswap_constant_32 (__bsx); })) #else static __inline unsigned int __bswap_32 (unsigned int __bsx) { - return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | - (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); + return __bswap_constant_32 (__bsx); } #endif |