BITMAP_POS_TO_ORD - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic Kernel Library Functions

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NAMEbitmap_pos_to_ord −

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SYNOPSISint bitmap_pos_to_ord(const unsigned long * buf, int pos, int bits);

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ARGUMENTSbuf pointer to a bitmap pos a bit position in buf (0 <= pos < bits) bits number of valid bit positions in buf

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DESCRIPTIONMap the bit at position pos in buf (of length bits) 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 0​. 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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