ffs (9) - Linux Manuals
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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