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memcmp
======

Syntax
------

     #include <string.h>
     
     int memcmp(const void *s1, const void *s2, size_t num);

Description
-----------

This function compares two regions of memory, at S1 and S2, for NUM
bytes.

Return Value
------------

zero
     s1 == s2

positive
     s1 > s2

negative
     s1 < s2