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include/bitops.h
158 строк
5 KB
Karel Zak
bitops: avoid macro redefinition on macOS
25 июн 2026, 16:12
25 июн 2026, 16:12
b15742b
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/* * No copyright is claimed. This code is in the public domain; do with * it what you wish. * * Written by Karel Zak <kzak@redhat.com> */ #ifndef BITOPS_H #define BITOPS_H #include <stdint.h> #include <sys/param.h> #if defined(HAVE_BYTESWAP_H) # include <byteswap.h> #endif #if defined(HAVE_ENDIAN_H) # include <endian.h> #elif defined(HAVE_SYS_ENDIAN_H) /* BSDs have them here */ # include <sys/endian.h> #endif #if !(defined(HAVE_BYTESWAP_H) && defined(HAVE_ENDIAN_H)) /* * When both byteswap.h and endian.h are present, the proper macros are defined * as those files are glibc compatible. Otherwise, compensate for the slightly * different interfaces between the different BSDs. */ #if defined(__OpenBSD__) # include <sys/types.h> # define be16toh(x) betoh16(x) # define be32toh(x) betoh32(x) # define be64toh(x) betoh64(x) #elif defined(__NetBSD__) || defined(__DragonFly__) # define bswap_16(x) bswap16(x) # define bswap_32(x) bswap32(x) # define bswap_64(x) bswap64(x) #elif defined(__APPLE__) # include <libkern/OSByteOrder.h> # ifndef HAVE_SYS_ENDIAN_H # define htobe16(x) OSSwapHostToBigInt16(x) # define htole16(x) OSSwapHostToLittleInt16(x) # define be16toh(x) OSSwapBigToHostInt16(x) # define le16toh(x) OSSwapLittleToHostInt16(x) # define htobe32(x) OSSwapHostToBigInt32(x) # define htole32(x) OSSwapHostToLittleInt32(x) # define be32toh(x) OSSwapBigToHostInt32(x) # define le32toh(x) OSSwapLittleToHostInt32(x) # define htobe64(x) OSSwapHostToBigInt64(x) # define htole64(x) OSSwapHostToLittleInt64(x) # define be64toh(x) OSSwapBigToHostInt64(x) # define le64toh(x) OSSwapLittleToHostInt64(x) # endif # define bswap_16(x) OSSwapInt16(x) # define bswap_32(x) OSSwapInt32(x) # define bswap_64(x) OSSwapInt64(x) #endif #endif /* * 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) ((uint16_t)( \ (((uint16_t)(x) & 0x00FF) << 8) | \ (((uint16_t)(x) & 0xFF00) >> 8))) #endif #ifndef bswap_32 # 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) ((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 # if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ # define htobe16(x) bswap_16 (x) # define htole16(x) (x) # define be16toh(x) bswap_16 (x) # define le16toh(x) (x) # define htobe32(x) bswap_32 (x) # define htole32(x) (x) # define be32toh(x) bswap_32 (x) # define le32toh(x) (x) # define htobe64(x) bswap_64 (x) # define htole64(x) (x) # define be64toh(x) bswap_64 (x) # define le64toh(x) (x) # else # define htobe16(x) (x) # define htole16(x) bswap_16 (x) # define be16toh(x) (x) # define le16toh(x) bswap_16 (x) # define htobe32(x) (x) # define htole32(x) bswap_32 (x) # define be32toh(x) (x) # define le32toh(x) bswap_32 (x) # define htobe64(x) (x) # define htole64(x) bswap_64 (x) # define be64toh(x) (x) # define le64toh(x) bswap_64 (x) # endif #endif /* * Byte swab macros (based on linux/byteorder/swab.h) */ #define swab16(x) bswap_16(x) #define swab32(x) bswap_32(x) #define swab64(x) bswap_64(x) #define cpu_to_le16(x) ((uint16_t) htole16(x)) #define cpu_to_le32(x) ((uint32_t) htole32(x)) #define cpu_to_le64(x) ((uint64_t) htole64(x)) #define cpu_to_be16(x) ((uint16_t) htobe16(x)) #define cpu_to_be32(x) ((uint32_t) htobe32(x)) #define cpu_to_be64(x) ((uint64_t) htobe64(x)) #define le16_to_cpu(x) ((uint16_t) le16toh(x)) #define le32_to_cpu(x) ((uint32_t) le32toh(x)) #define le64_to_cpu(x) ((uint64_t) le64toh(x)) #define be16_to_cpu(x) ((uint16_t) be16toh(x)) #define be32_to_cpu(x) ((uint32_t) be32toh(x)) #define be64_to_cpu(x) ((uint64_t) be64toh(x)) /* * Bit map related macros. Usually provided by libc. */ #ifndef NBBY # define NBBY CHAR_BIT #endif #ifndef setbit # define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) # define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) # define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) # define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) #endif #endif /* BITOPS_H */