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.
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