NAME

bcopy, bcmp, bzero, ffs − bit and byte string operations

USAGE

bcopy(b1, b2, length) char *b1, *b2; int length;
 
bcmp(b1, b2, length) char *b1, *b2; int length;
 
bzero(b, length) char *b; int length;
 
ffs(i) int i;

DESCRIPTION

The functions bcopy, bcmp, and bzero operate on variable length strings of bytes.  They do not check for null bytes as the routines in string(3) do. 

Bcopy copies length bytes from string b1 to string b2.

Bcmp 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. 

Bzero places length zero bytes in the string b1.

Ffs returns the index of the first bit set in its argument.  A zero return indicates a zero argument.  Bits are numbered starting at 1. 

NOTES

The bcmp and bcopy routines take parameters in reverse order from strcmp and strcpy.  For example, strcpy (foo, bar) copies foo to bar, while bcpy (foo, bar, 3) copies bar to foo.