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include/bitops: add casts to bswap functions 

Based on kernel sources include/uapi/linux/swab.h.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
This commit is contained in:
Ruediger Meier 2016-03-08 09:11:08 +01:00
parent 076153f816
commit d01c0adb83
1 changed files with 19 additions and 14 deletions
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33
include/bitops.h
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@ -29,28 +29,33 @@
/*
* Fallbacks
* casts are necessary for constants, because we never know how for sure
* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
*/
#ifndef bswap_16
# define bswap_16(x) ((((x) & 0x00FF) << 8) | \
(((x) & 0xFF00) >> 8))
# define bswap_16(x) ((uint16_t)( \
(((uint16_t)(x) & 0x00FF) << 8) | \
(((uint16_t)(x) & 0xFF00) >> 8)))
#endif
#ifndef bswap_32
# define bswap_32(x) ((((x) & 0x000000FF) << 24) | \
(((x) & 0x0000FF00) << 8) | \
(((x) & 0x00FF0000) >> 8) | \
(((x) & 0xFF000000) >> 24))
# define bswap_32(x) ((uint32_t)( \
(((uint32_t)(x) & 0x000000FF) << 24) | \
(((uint32_t)(x) & 0x0000FF00) << 8) | \
(((uint32_t)(x) & 0x00FF0000) >> 8) | \
(((uint32_t)(x) & 0xFF000000) >> 24)))
#endif
#ifndef bswap_64
# define bswap_64(x) ((((x) & 0x00000000000000FFULL) << 56) | \
(((x) & 0x000000000000FF00ULL) << 40) | \
(((x) & 0x0000000000FF0000ULL) << 24) | \
(((x) & 0x00000000FF000000ULL) << 8) | \
(((x) & 0x000000FF00000000ULL) >> 8) | \
(((x) & 0x0000FF0000000000ULL) >> 24) | \
(((x) & 0x00FF000000000000ULL) >> 40) | \
(((x) & 0xFF00000000000000ULL) >> 56))
# define bswap_64(x) ((uint64_t)( \
(((uint64_t)(x) & 0x00000000000000FFULL) << 56) | \
(((uint64_t)(x) & 0x000000000000FF00ULL) << 40) | \
(((uint64_t)(x) & 0x0000000000FF0000ULL) << 24) | \
(((uint64_t)(x) & 0x00000000FF000000ULL) << 8) | \
(((uint64_t)(x) & 0x000000FF00000000ULL) >> 8) | \
(((uint64_t)(x) & 0x0000FF0000000000ULL) >> 24) | \
(((uint64_t)(x) & 0x00FF000000000000ULL) >> 40) | \
(((uint64_t)(x) & 0xFF00000000000000ULL) >> 56)))
#endif
#ifndef htobe16