ffs (9) - Linux Man Pages

ffs: find first set bit in word

NAME

ffs - find first set bit in word

SYNOPSIS

int ffs(int x);

ARGUMENTS

x

the word to search

DESCRIPTION

This is defined the same way as the libc and compiler builtin ffs routines, therefore differs in spirit from the other bitops.

ffs(value) returns 0 if value is 0 or the position of the first set bit if value is nonzero. The first (least significant) bit is at position 1.

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