int memcmp(const void *s1, const void *s2, size_t n);
IEEE Std 1003.1-2017
memcmp() function shall compare the first n bytes (each interpreted as unsigned char) of the object
pointed to by s1 to the first n bytes of the object pointed to by s2.
The sign of a non-zero return value shall be determined by the sign of the difference between the values of the first pair of bytes (both interpreted as type unsigned char) that differ in the objects being compared.
memcmp() function shall return an integer greater than, equal to, or less than
0, if the object pointed to by
s1 is greater than, equal to, or less than the object pointed to by s2, respectively.
No errors are defined.