NAME¶
memcmp - compare memory areas
SYNOPSIS¶
#include <string.h>
int memcmp(const void *s1, const void *s2, size_t n);
DESCRIPTION¶
The memcmp() function compares the first n bytes of the memory
  areas s1 and s2. It returns an integer less than, equal to, or
  greater than zero if s1 is found, respectively, to be less than, to
  match, or be greater than s2.
RETURN VALUE¶
The memcmp() function returns an integer less than, equal to, or greater
  than zero if the first n bytes of s1 is found, respectively, to
  be less than, to match, or be greater than the first n bytes of
  s2.
SVID 3, BSD 4.3, ISO 9899