memcmp - compare memory areas
#include <string.h>
int memcmp(const void *s1, const void *s2, size_t n);The memcmp() function compares the first n bytes (each interpreted as unsigned char) of the memory areas s1 and s2.
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.
For a nonzero return value, the sign is determined by the sign of the difference between the first pair of bytes (interpreted as unsigned char) that differ in s1 and s2.
If n is zero, the return value is zero.
bcmp(3), bstring(3), strcasecmp(3), strcmp(3), strcoll(3), strncasecmp(3), strncmp(3), wmemcmp(3)