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@(#)bstring.3 6.4 (Berkeley) 12/07/88

C 5 bcopy, bcmp, bzero, ffs - bit and byte string operations

 bcopy(src, dst, length)  char *src, *dst;  int length; 

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

 bzero(b, length)  char *b;  int length; 

 ffs(i)  int i; 

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 src to the string dst . The src and dst strings may overlap.

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. Bcmp of length zero bytes always returns zero.

Bzero places length 0 bytes in the string b1 .

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

The bcopy routine take parameters backwards from strcpy .