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.