ISCNTRL(3) NEWLIB ISCNTRL(3)NAME
3.4 `iscntrl'--control character predicate
SYNOPSIS
#include <ctype.h>
int iscntrl(int C);
DESCRIPTION
`iscntrl' is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for control characters,
and 0 for other characters. It is defined only when `isascii'(C) is
true or C is EOF.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using ``#undef iscntrl''.
RETURNS
`iscntrl' returns non-zero if C is a delete character or ordinary con‐
trol character (`0x7F' or `0x00'-`0x1F').
PORTABILITY
`iscntrl' is ANSI C.
No supporting OS subroutines are required.
SEE ALSOiscntrl is part of the library. The full documentation for is main‐
tained as a Texinfo manual. If info and are properly installed at your
site, the command
info
will give you access to the complete manual.
NEWLIB April 2010 ISCNTRL(3)
