NAME

iscntrl — control 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.

SEE ALSO

ctype(3), isalnum(3), isalpha(3), isascii(3), isblank(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

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.