strlen, _fstrlen
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The strlen function returns the length in bytes of <string>, not
including the terminating null character (\0).
The _fstrlen form of this function is a model-independent (large-
model) form that uses a far pointer form of the <string> argument.
This model-independent function can be called from any point in
the program.
Return Value
The strlen and _fstrlen functions return the string length. There
is no error return.
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