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/* Macros and inline functions to swap the order of bytes in integer values. |
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Copyright (C) 1997-2024 Free Software Foundation, Inc. |
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This file is part of the GNU C Library. |
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The GNU C Library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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The GNU C Library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with the GNU C Library; if not, see |
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<https://www.gnu.org/licenses/>. */ |
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#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H |
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# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." |
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#endif |
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#ifndef _BITS_BYTESWAP_H |
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#define _BITS_BYTESWAP_H 1 |
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#include <features.h> |
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#include <bits/types.h> |
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/* Swap bytes in 16-bit value. */ |
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#define __bswap_constant_16(x) \ |
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((__uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))) |
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static __inline __uint16_t |
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__bswap_16 (__uint16_t __bsx) |
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{ |
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#if __GNUC_PREREQ (4, 8) |
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return __builtin_bswap16 (__bsx); |
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#else |
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return __bswap_constant_16 (__bsx); |
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#endif |
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} |
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/* Swap bytes in 32-bit value. */ |
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#define __bswap_constant_32(x) \ |
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((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) \ |
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| (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) |
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static __inline __uint32_t |
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438340
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__bswap_32 (__uint32_t __bsx) |
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{ |
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#if __GNUC_PREREQ (4, 3) |
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219170
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return __builtin_bswap32 (__bsx); |
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#else |
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return __bswap_constant_32 (__bsx); |
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#endif |
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} |
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/* Swap bytes in 64-bit value. */ |
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#define __bswap_constant_64(x) \ |
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((((x) & 0xff00000000000000ull) >> 56) \ |
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| (((x) & 0x00ff000000000000ull) >> 40) \ |
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| (((x) & 0x0000ff0000000000ull) >> 24) \ |
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| (((x) & 0x000000ff00000000ull) >> 8) \ |
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| (((x) & 0x00000000ff000000ull) << 8) \ |
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| (((x) & 0x0000000000ff0000ull) << 24) \ |
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| (((x) & 0x000000000000ff00ull) << 40) \ |
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| (((x) & 0x00000000000000ffull) << 56)) |
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__extension__ static __inline __uint64_t |
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__bswap_64 (__uint64_t __bsx) |
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{ |
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#if __GNUC_PREREQ (4, 3) |
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return __builtin_bswap64 (__bsx); |
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#else |
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return __bswap_constant_64 (__bsx); |
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#endif |
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} |
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#endif /* _BITS_BYTESWAP_H */ |