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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.