Automatic date update in version.in
[binutils-gdb.git] / libctf / swap.h
blob2e2b69735311165416a4478a7d8c9f6adb86e08c
1 /* Interface to byteswapping functions.
2 Copyright (C) 2006-2024 Free Software Foundation, Inc.
4 This file is part of libctf.
6 libctf is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14 See the GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; see the file COPYING. If not see
18 <http://www.gnu.org/licenses/>. */
20 #ifndef _CTF_SWAP_H
21 #define _CTF_SWAP_H
23 #include "config.h"
24 #include <stdint.h>
25 #include <assert.h>
27 #ifdef HAVE_BYTESWAP_H
28 #include <byteswap.h>
29 #endif /* defined(HAVE_BYTESWAP_H) */
31 /* Provide our own versions of the byteswap functions. */
33 #if !HAVE_DECL_BSWAP_16
34 static inline uint16_t
35 bswap_16 (uint16_t v)
37 return ((v >> 8) & 0xff) | ((v & 0xff) << 8);
39 #endif /* !HAVE_DECL_BSWAP16 */
41 #if !HAVE_DECL_BSWAP_32
42 static inline uint32_t
43 bswap_32 (uint32_t v)
45 return ( ((v & 0xff000000) >> 24)
46 | ((v & 0x00ff0000) >> 8)
47 | ((v & 0x0000ff00) << 8)
48 | ((v & 0x000000ff) << 24));
50 #endif /* !HAVE_DECL_BSWAP32 */
52 #if !HAVE_DECL_BSWAP_64
53 static inline uint64_t
54 bswap_64 (uint64_t v)
56 return ( ((v & 0xff00000000000000ULL) >> 56)
57 | ((v & 0x00ff000000000000ULL) >> 40)
58 | ((v & 0x0000ff0000000000ULL) >> 24)
59 | ((v & 0x000000ff00000000ULL) >> 8)
60 | ((v & 0x00000000ff000000ULL) << 8)
61 | ((v & 0x0000000000ff0000ULL) << 24)
62 | ((v & 0x000000000000ff00ULL) << 40)
63 | ((v & 0x00000000000000ffULL) << 56));
65 #endif /* !HAVE_DECL_BSWAP64 */
67 /* < C11? define away static assertions. */
69 #if !defined (__STDC_VERSION__) || __STDC_VERSION__ < 201112L
70 #ifndef _Static_assert
71 #define _Static_assert(cond, err)
72 #endif
73 #endif
75 /* Swap the endianness of something. */
77 #define swap_thing(x) \
78 do \
79 { \
80 _Static_assert (sizeof (x) == 1 || (sizeof (x) % 2 == 0 \
81 && sizeof (x) <= 8), \
82 "Invalid size, update endianness code"); \
83 switch (sizeof (x)) { \
84 case 2: x = bswap_16 (x); break; \
85 case 4: x = bswap_32 (x); break; \
86 case 8: x = bswap_64 (x); break; \
87 case 1: /* Nothing needs doing */ \
88 break; \
89 } \
90 } \
91 while (0);
94 #endif /* !defined(_CTF_SWAP_H) */