1 /* 2 * No copyright is claimed. This code is in the public domain; do with 3 * it what you wish. 4 * 5 * Written by Karel Zak <kzak@redhat.com> 6 */ 7 #ifndef BITOPS_H 8 #define BITOPS_H 9 10 #include <stdint.h> 11 #include <sys/param.h> 12 13 #if defined(HAVE_BYTESWAP_H) 14 # include <byteswap.h> 15 #endif 16 17 #if defined(HAVE_ENDIAN_H) 18 # include <endian.h> 19 #elif defined(HAVE_SYS_ENDIAN_H) /* BSDs have them here */ 20 # include <sys/endian.h> 21 #endif 22 23 #if defined(__OpenBSD__) 24 # include <sys/types.h> 25 # define be16toh(x) betoh16(x) 26 # define be32toh(x) betoh32(x) 27 # define be64toh(x) betoh64(x) 28 #endif 29 30 /* 31 * Fallbacks 32 */ 33 #ifndef bswap_16 34 # define bswap_16(x) ((((x) & 0x00FF) << 8) | \ 35 (((x) & 0xFF00) >> 8)) 36 #endif 37 38 #ifndef bswap_32 39 # define bswap_32(x) ((((x) & 0x000000FF) << 24) | \ 40 (((x) & 0x0000FF00) << 8) | \ 41 (((x) & 0x00FF0000) >> 8) | \ 42 (((x) & 0xFF000000) >> 24)) 43 #endif 44 45 #ifndef bswap_64 46 # define bswap_64(x) ((((x) & 0x00000000000000FFULL) << 56) | \ 47 (((x) & 0x000000000000FF00ULL) << 40) | \ 48 (((x) & 0x0000000000FF0000ULL) << 24) | \ 49 (((x) & 0x00000000FF000000ULL) << 8) | \ 50 (((x) & 0x000000FF00000000ULL) >> 8) | \ 51 (((x) & 0x0000FF0000000000ULL) >> 24) | \ 52 (((x) & 0x00FF000000000000ULL) >> 40) | \ 53 (((x) & 0xFF00000000000000ULL) >> 56)) 54 #endif 55 56 #ifndef htobe16 57 # if !defined(WORDS_BIGENDIAN) 58 # define htobe16(x) bswap_16 (x) 59 # define htole16(x) (x) 60 # define be16toh(x) bswap_16 (x) 61 # define le16toh(x) (x) 62 # define htobe32(x) bswap_32 (x) 63 # define htole32(x) (x) 64 # define be32toh(x) bswap_32 (x) 65 # define le32toh(x) (x) 66 # define htobe64(x) bswap_64 (x) 67 # define htole64(x) (x) 68 # define be64toh(x) bswap_64 (x) 69 # define le64toh(x) (x) 70 # else 71 # define htobe16(x) (x) 72 # define htole16(x) bswap_16 (x) 73 # define be16toh(x) (x) 74 # define le16toh(x) bswap_16 (x) 75 # define htobe32(x) (x) 76 # define htole32(x) bswap_32 (x) 77 # define be32toh(x) (x) 78 # define le32toh(x) bswap_32 (x) 79 # define htobe64(x) (x) 80 # define htole64(x) bswap_64 (x) 81 # define be64toh(x) (x) 82 # define le64toh(x) bswap_64 (x) 83 # endif 84 #endif 85 86 /* 87 * Byte swab macros (based on linux/byteorder/swab.h) 88 */ 89 #define swab16(x) bswap_16(x) 90 #define swab32(x) bswap_32(x) 91 #define swab64(x) bswap_64(x) 92 93 #define cpu_to_le16(x) ((uint16_t) htole16(x)) 94 #define cpu_to_le32(x) ((uint32_t) htole32(x)) 95 #define cpu_to_le64(x) ((uint64_t) htole64(x)) 96 97 #define cpu_to_be16(x) ((uint16_t) htobe16(x)) 98 #define cpu_to_be32(x) ((uint32_t) htobe32(x)) 99 #define cpu_to_be64(x) ((uint64_t) htobe64(x)) 100 101 #define le16_to_cpu(x) ((uint16_t) le16toh(x)) 102 #define le32_to_cpu(x) ((uint32_t) le32toh(x)) 103 #define le64_to_cpu(x) ((uint64_t) le64toh(x)) 104 105 #define be16_to_cpu(x) ((uint16_t) be16toh(x)) 106 #define be32_to_cpu(x) ((uint32_t) be32toh(x)) 107 #define be64_to_cpu(x) ((uint64_t) be64toh(x)) 108 109 /* 110 * Bit map related macros. Usually provided by libc. 111 */ 112 #ifndef NBBY 113 # define NBBY CHAR_BIT 114 #endif 115 116 #ifndef setbit 117 # define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 118 # define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 119 # define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 120 # define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 121 #endif 122 123 #endif /* BITOPS_H */ 124 125
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