strcmp, strncmp - compare two strings
The strcmp() function compares the two strings
s2. It returns an integer less than, equal to, or greater than zero if
s1 is found, respectively, to be less than, to match, or be greater than
The strncmp() function is similar, except it compares only the first (at most)
n bytes of
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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