memcmp - Compare memory areas

Definition	#include <string.h> int memcmp(const void *s1, const void *s2, size_t n); memcmp compares the contents of the first n bytes of the memory areas to which s1 and s2 point.
Return val.	< 0	In the first n bytes, the contents of s1 are lexically smaller than the contents of s2.
	0	In the first n bytes, the contents of s1 and s2 are of equal lexical size (i.e. identical).
	> 0	In the first n bytes, the contents of s1 are lexically larger than the contents of s2.
Note	This function is suitable for processing character arrays containing the null byte (\0), since memcmp does not interpret the null byte as the ’end of text’.
See also	memchr, memcpy, memset