clrb, cmpb, movb, filb - perform byte operations
clrb (loc, length)
char *loc;
int length;
cmpb (p1, p2, length)
char *p1;
char *p2;
int length;
movb (dest, source, length)
char *dest;
char *source;
int length;
filb (s, c, n)
char *s;
char c;
int n;
Clrb zeros length bytes, starting at the pointer loc.
Cmpb compares its arguments and returns an integer greater than,
equal to or less than 0 according to whether p1 is
lexicographically greater than, equal to or less than p2. Cmpb
compares at most length bytes, but unlike strcmp(3), does not
stop upon reaching a zero byte.
Movb copies length bytes from source to dest.
Filb sets n bytes starting at s to character c.
Cmpb uses native character comparison that may be signed or
unsigned depending on the C compiler on your system.