char* strncmp( char* string1, char* string2, size_t max_len );
Let s denote the string obtained by choosing
string2 or max_len characters from
string2, whichever is shorter. Returns a negative
integer is string1 is (lexicographically) less than
s. Returns 0 if string1 is equal to
s. Returns a positive integer if string1
is greater than s.
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