diff options
Diffstat (limited to 'bits/byteswap.h')
| -rw-r--r-- | bits/byteswap.h | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/bits/byteswap.h b/bits/byteswap.h index 04a5efe9f0..a5dd4a7db3 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 Free Software Foundation, Inc. + Copyright (C) 1997, 1998 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 @@ -22,13 +22,34 @@ #endif /* Swap bytes in 16 bit value. */ -#define __bswap_16(x) \ - ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)) +#ifdef __GNUC__ +# define __bswap_16(x) \ + (__extension__ \ + ({ unsigned short int __bsx = (x); \ + ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); })) +#else +static __inline unsigned short int +__bswap16 (unsigned short int x) +{ + return ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)); +} +#endif /* Swap bytes in 32 bit value. */ -#define __bswap_32(x) \ - ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ - (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) +#ifdef __GNUC__ +# define __bswap_32(x) \ + (__extension__ \ + ({ unsigned int __bsx = (x); \ + ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \ + (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); })) +#else +static __inline unsigned int +__bswap32 (unsigned int x) +{ + return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | + (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); +} +#endif #if defined __GNUC__ && __GNUC__ >= 2 /* Swap bytes in 64 bit value. */ |