FFS32(3) NetBSD Library Functions Manual FFS32(3)NAME

ffs32,ffs64,fls32,fls64-- find first or last bit setSYNOPSIS

#include <sys/bitops.h>intffs32(uint32_t n);intffs64(uint64_t n);intfls32(uint32_t n);intfls64(uint64_t n);DESCRIPTION

Theffs32() andffs64() functions find the first bit set innand return the index of that bit. Conversely, thefls32() andfls64() functions find the last bit set inn, returning the index of the bit. The search always starts from the bit 1 (the least significant bit). If the argumentnis zero, each function returns zero.IMPLEMENTATION NOTES

The described functions are implemented asstatic inlinefunctions in the <sys/bitops.h> header. The standard C library includes a more portable ffs(3) for user applications.EXAMPLES

In the following examplef = 3andl = 7: uint32_t n = 0x44; /* 01000100 */ int f, l; f = ffs32(n); l = fls32(n);SEE ALSO

bitops(3), bits(3), bitstring(3), ffs(3), setbit(9)HISTORY

These functions first appeared in NetBSD 5.0. NetBSD 10.0 April 8, 2011 NetBSD 10.0

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