libc.info: memcmp

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`memcmp'--compare two memory areas

*Synopsis*
     #include <string.h>
     int memcmp(const void *S1, const void *S2, size_t N);
   *Description*
This function compares not more than N characters of the object pointed
to by S1 with the object pointed to by S2.
*Returns*
The function returns an integer greater than, equal to or less than
zero 	according to whether the object pointed to by S1 is greater than,
equal to or less than the object pointed to by S2.
*Portability*
`memcmp' is ANSI C.
   `memcmp' requires no supporting OS subroutines.