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Diffstat (limited to 'lib/bitops.h')
-rw-r--r-- | lib/bitops.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/lib/bitops.h b/lib/bitops.h new file mode 100644 index 0000000..a991687 --- /dev/null +++ b/lib/bitops.h @@ -0,0 +1,123 @@ +/* + * 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(__OpenBSD__) +# include <sys/types.h> +# define be16toh(x) betoh16(x) +# define be32toh(x) betoh32(x) +# define be64toh(x) betoh64(x) +#endif + +/* + * Fallbacks + */ +#ifndef bswap_16 +# define bswap_16(x) ((((x) & 0x00FF) << 8) | \ + (((x) & 0xFF00) >> 8)) +#endif + +#ifndef bswap_32 +# define bswap_32(x) ((((x) & 0x000000FF) << 24) | \ + (((x) & 0x0000FF00) << 8) | \ + (((x) & 0x00FF0000) >> 8) | \ + (((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)) +#endif + +#ifndef htobe16 +# if !defined(WORDS_BIGENDIAN) +# 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 */ |