bitmap_pos_to_ord (9) - Linux Manuals
bitmap_pos_to_ord: find ordinal of set bit at given position in bitmap
NAME
bitmap_pos_to_ord - find ordinal of set bit at given position in bitmap
SYNOPSIS
-
int bitmap_pos_to_ord(const unsigned long
* buf, unsigned intpos, unsigned int nbits);
ARGUMENTS
buf
-
- pointer to a bitmap
pos
- a bit position in buf (0 <= pos < nbits)
nbits
- number of valid bit positions in buf
DESCRIPTION
Map the bit at position pos in buf (of length nbits) to the ordinal of which set bit it is. If it is not set or if pos is not a valid bit position, map to -1.
If for example, just bits 4 through 7 are set in buf, then pos values 4 through 7 will get mapped to 0 through 3, respectively, and other pos values will get mapped to -1. When pos value 7 gets mapped to (returns) ord value 3 in this example, that means that bit 7 is the 3rd (starting with 0th) set bit in buf.
The bit positions 0 through bits are valid positions in buf.
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