memset - fill memory with a constant byte
#include <string.h> void *memset(void *s, int c, size_t n
The memset() function fills the first n bytes of the memory area pointed to by s with the constant byte c.
The memset() function returns a pointer to the memory area s.
SVID 3, BSD 4.3, ISO 9899
bzero(3), swab(3)