ultrix man page for ffs

bstring(3)						     Library Functions Manual							bstring(3)

Name
       bcopy, bcmp, bzero, ffs - bit and byte string operations

Syntax
       void bcopy(b1, b2, length)
       char *b1, *b2;
       int length;

       bcmp(b1, b2, length)
       char *b1, *b2;
       int length;

       void bzero(b1, length)
       char *b1;
       int length;

       ffs(i)
       int i;

Description
       The functions and operate on variable length strings of bytes.  They do not check for null bytes as the routines in do.

       The function copies length bytes from string b1 to the string b2.

       The  function  compares	byte string b1 against byte string b2, returning zero if they are identical, non-zero otherwise.  Both strings are
       assumed to be length bytes long.

       The function places length 0 bytes in the string b1.

       The ffs finds the first bit set in the argument passed it and returns the index of that bit.  Bits are numbered starting at  1.	 A  return
       value of 0 indicates the value passed is zero.

Restrictions
       The and routines take parameters backwards from and

See Also
																	bstring(3)