ffs()

find first set bit 

Function

SYNOPSIS

#include <string.h>

int ffs(unsigned int i);

DESCRIPTION

The ffs() function returns the index of the first bit set in i. Bits are numbered starting at 1 from the least significant bit. A return value of zero indicates the value of i is zero.

PARAMETERS

i 

Is an integer.

RETURN VALUES

The ffs() returns the index of the first bit set in i, or zero if no bits are set.

CONFORMANCE

4.4BSD

MULTITHREAD SAFETY LEVEL

MT-Safe.

PORTING ISSUES

None.

AVAILABILITY

PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

SEE ALSO

Functions:
bcmp(), bcopy(), bzero()

PTC MKS Toolkit 10.5 Documentation Build 40.