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lib: Additional APIs in bitfield library

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Added APIs to:
a) pre-assign 0th bit in the bitfield
b) free 0th bit in the bitfield
c) free the allocated bitfield data

Signed-off-by: Mitesh Kanjariya <mitesh@cumulusnetworks.com>
Reviewed-by:   Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by:   Vivek Venkatraman <vivek@cumulusnetworks.com>
This commit is contained in:
vivek 2017-05-14 22:18:26 -07:00
parent 8234a9875b
commit 4e9da20145
1 changed files with 27 additions and 1 deletions
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28
lib/bitfield.h
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@ -78,12 +78,27 @@ typedef unsigned int word_t;
bf_set_bit(v, id); \
} while (0)
/**
/*
* allocate and assign 0th bit in the bitfiled.
*/
#define bf_assign_zero_index(v) \
do { \
int id = 0; \
bf_assign_index(v, id); \
} while (0)
/*
* return an id to bitfield v
*/
#define bf_release_index(v, id) \
(v).data[bf_index(id)] &= ~(1 << (bf_offset(id)))
/*
* return 0th index back to bitfield
*/
#define bf_release_zero_index(v) \
bf_release_index(v, 0)
#define bf_index(b) ((b) / WORD_SIZE)
#define bf_offset(b) ((b) % WORD_SIZE)
@ -118,4 +133,15 @@ typedef unsigned int word_t;
(b) += (w * WORD_SIZE); \
} while (0)
/*
* Free the allocated memory for data
* @v: an instance of bitfield_t struct.
*/
#define bf_free(v) \
do { \
if ((v).data) { \
free((v).data); \
} \
} while (0)
#endif