+@deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, @
+ size_t @var{count})
+
+Compares the first @var{count} bytes of two areas of memory. Returns
+zero if they are the same, a value less than zero if @var{x} is
+lexically less than @var{y}, or a value greater than zero if @var{x}
+is lexically greater than @var{y}. Note that lexical order is determined
+as if comparing unsigned char arrays.
+
+@end deftypefn