add a tiny version of libblkid

[project/ubox.git] / libblkid-tiny / bitops.h

diff --git a/libblkid-tiny/bitops.h b/libblkid-tiny/bitops.h
new file mode 100644 (file)
index 0000000..81375d0
--- /dev/null
+++ b/libblkid-tiny/bitops.h
@@ -0,0 +1,84 @@
+#ifndef BITOPS_H
+#define BITOPS_H
+
+#include <stdint.h>
+
+/*
+ * Bit map related macros. Usually provided by libc.
+ */
+#include <sys/param.h>
+
+#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
+
+/*
+ * Byte swab macros (based on linux/byteorder/swab.h)
+ */
+#define swab16(x) \
+       ((uint16_t)( \
+               (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \
+               (((uint16_t)(x) & (uint16_t)0xff00U) >> 8) ))
+
+#define swab32(x) \
+       ((uint32_t)( \
+               (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
+               (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) | \
+               (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) | \
+               (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24) ))
+
+#define swab64(x) \
+       ((uint64_t)( \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) | \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) | \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
+               (uint64_t)(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) ))
+
+
+#ifdef WORDS_BIGENDIAN
+
+#define cpu_to_le16(x) swab16(x)
+#define cpu_to_le32(x) swab32(x)
+#define cpu_to_le64(x) swab64(x)
+#define cpu_to_be16(x) ((uint16_t)(x))
+#define cpu_to_be32(x) ((uint32_t)(x))
+#define cpu_to_be64(x) ((uint64_t)(x))
+
+#define le16_to_cpu(x) swab16(x)
+#define le32_to_cpu(x) swab32(x)
+#define le64_to_cpu(x) swab64(x)
+#define be16_to_cpu(x) ((uint16_t)(x))
+#define be32_to_cpu(x) ((uint32_t)(x))
+#define be64_to_cpu(x) ((uint64_t)(x))
+
+#else /* !WORDS_BIGENDIAN */
+
+#define cpu_to_le16(x) ((uint16_t)(x))
+#define cpu_to_le32(x) ((uint32_t)(x))
+#define cpu_to_le64(x) ((uint64_t)(x))
+#define cpu_to_be16(x) swab16(x)
+#define cpu_to_be32(x) swab32(x)
+#define cpu_to_be64(x) swab64(x)
+
+#define le16_to_cpu(x) ((uint16_t)(x))
+#define le32_to_cpu(x) ((uint32_t)(x))
+#define le64_to_cpu(x) ((uint64_t)(x))
+#define be16_to_cpu(x) swab16(x)
+#define be32_to_cpu(x) swab32(x)
+#define be64_to_cpu(x) swab64(x)
+
+#endif /* WORDS_BIGENDIAN */
+
+#endif /* BITOPS_H */
+