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1522c368 | 1 | /* Macros to swap the order of bytes in integer values. |
945c975d | 2 | Copyright (C) 1997, 1998, 2000 Free Software Foundation, Inc. |
1522c368 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
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 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
f4017d20 UD |
20 | #if !defined _BYTESWAP_H && !defined _NETINET_IN_H |
21 | # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." | |
22 | #endif | |
1522c368 UD |
23 | |
24 | /* Swap bytes in 16 bit value. */ | |
7ce241a0 UD |
25 | #ifdef __GNUC__ |
26 | # define __bswap_16(x) \ | |
27 | (__extension__ \ | |
28 | ({ unsigned short int __bsx = (x); \ | |
29 | ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); })) | |
30 | #else | |
31 | static __inline unsigned short int | |
5edb9387 | 32 | __bswap_16 (unsigned short int __bsx) |
7ce241a0 | 33 | { |
5edb9387 | 34 | return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); |
7ce241a0 UD |
35 | } |
36 | #endif | |
1522c368 UD |
37 | |
38 | /* Swap bytes in 32 bit value. */ | |
7ce241a0 UD |
39 | #ifdef __GNUC__ |
40 | # define __bswap_32(x) \ | |
41 | (__extension__ \ | |
42 | ({ unsigned int __bsx = (x); \ | |
43 | ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \ | |
44 | (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); })) | |
45 | #else | |
46 | static __inline unsigned int | |
5edb9387 | 47 | __bswap_32 (unsigned int __bsx) |
7ce241a0 UD |
48 | { |
49 | return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | | |
50 | (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); | |
51 | } | |
52 | #endif | |
1522c368 UD |
53 | |
54 | #if defined __GNUC__ && __GNUC__ >= 2 | |
55 | /* Swap bytes in 64 bit value. */ | |
56 | # define __bswap_64(x) \ | |
7782d0bf UD |
57 | (__extension__ \ |
58 | ({ union { unsigned long long int __ll; \ | |
945c975d | 59 | unsigned int __l[2]; } __v, __r; \ |
7782d0bf UD |
60 | __v.__ll = (x); \ |
61 | __r.__l[0] = __bswap_32 (__v.__l[1]); \ | |
62 | __r.__l[1] = __bswap_32 (__v.__l[0]); \ | |
63 | __r.__ll; })) | |
1522c368 | 64 | #endif |