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3.13 toascii—force integers to ASCII range

Synopsis 

     #include <ctype.h>
     int toascii(int c);

Description
toascii is a macro which coerces integers to the ASCII range (0–127) by zeroing any higher-order bits.

You can use a compiled subroutine instead of the macro definition by undefining this macro using `#undef toascii'.
Returns
toascii returns integers between 0 and 127.
Portability
toascii is not ANSI C.

No supporting OS subroutines are required.