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.