From Noritoshi Demizu: memcmp() returns a value = 0 if the two memory

From Noritoshi Demizu: memcmp() returns a value = 0 if the two memory
regions are =, < 0 if the first memory region is < the second, or > 0 if
the first memory region is > the second, so to check whether two memory
regions are equal, check whether memcmp()'s return value is == 0.