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isascii
[ASCII character predicate]

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

DESCRIPTION
isascii is a macro which returns non-zero when c is an ASCII character, and 0 otherwise. It is defined for all integer values.

You can use a compiled subroutine instead of the macro definition by undefining the macro, using #undef isascii.

RETURNS
isascii returns non-zero if the low order byte of c is in the range 0 to 127 (0x00–0x7F).

COMPLIANCE
isascii is ANSI C.

No supporting OS subroutines are required.