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`memset'--set an area of memory

     #include <string.h>
     void *memset(const void *DST, int C, size_t LENGTH);
This function converts the argument C into an unsigned char and fills
the first LENGTH characters of the array pointed to by DST to the value.
`memset' returns the value of M.
`memset' is ANSI C.
   `memset' requires no supporting OS subroutines.