libroot/posix/stdio: Remove unused portions.
[haiku.git] / src / system / libroot / posix / glibc / include / arch / generic / bits / byteswap.h
blob38d854013050a4e3b39b89d6792caa9247588c9f
1 /* Macros to swap the order of bytes in integer values.
2 Copyright (C) 1997, 1998, 2000, 2001, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #if !defined _BYTESWAP_H && !defined _NETINET_IN_H
21 # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
22 #endif
24 #ifndef _BITS_BYTESWAP_H
25 #define _BITS_BYTESWAP_H 1
27 /* Swap bytes in 16 bit value. */
28 #ifdef __GNUC__
29 # define __bswap_16(x) \
30 (__extension__ \
31 ({ unsigned short int __bsx = (x); \
32 ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); }))
33 #else
34 static __inline unsigned short int
35 __bswap_16 (unsigned short int __bsx)
37 return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8));
39 #endif
41 /* Swap bytes in 32 bit value. */
42 #ifdef __GNUC__
43 # define __bswap_32(x) \
44 (__extension__ \
45 ({ unsigned int __bsx = (x); \
46 ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \
47 (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); }))
48 #else
49 static __inline unsigned int
50 __bswap_32 (unsigned int __bsx)
52 return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) |
53 (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24));
55 #endif
57 #if defined __GNUC__ && __GNUC__ >= 2
58 /* Swap bytes in 64 bit value. */
59 # define __bswap_constant_64(x) \
60 ((((x) & 0xff00000000000000ull) >> 56) \
61 | (((x) & 0x00ff000000000000ull) >> 40) \
62 | (((x) & 0x0000ff0000000000ull) >> 24) \
63 | (((x) & 0x000000ff00000000ull) >> 8) \
64 | (((x) & 0x00000000ff000000ull) << 8) \
65 | (((x) & 0x0000000000ff0000ull) << 24) \
66 | (((x) & 0x000000000000ff00ull) << 40) \
67 | (((x) & 0x00000000000000ffull) << 56))
69 # define __bswap_64(x) \
70 (__extension__ \
71 ({ union { __extension__ unsigned long long int __ll; \
72 unsigned int __l[2]; } __w, __r; \
73 if (__builtin_constant_p (x)) \
74 __r.__ll = __bswap_constant_64 (x); \
75 else \
76 { \
77 __w.__ll = (x); \
78 __r.__l[0] = __bswap_32 (__w.__l[1]); \
79 __r.__l[1] = __bswap_32 (__w.__l[0]); \
80 } \
81 __r.__ll; }))
82 #endif
84 #endif /* _BITS_BYTESWAP_H */