Manual browser: iscntrl(3)

Section:
Page:
ISCNTRL(3) Library Functions Manual ISCNTRL(3)

NAME

iscntrlcontrol character test

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <ctype.h>

int
iscntrl(int c);

DESCRIPTION

The iscntrl() function tests for any control character.

RETURN VALUES

The iscntrl() function returns zero if the character tests false and returns non-zero if the character tests true.

STANDARDS

The iscntrl() function conforms to ANSI X3.159-1989 (“ANSI C89”).

CAVEATS

The argument to iscntrl() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details.
April 17, 2008 NetBSD 7.0