iissccnnttrrll() -- ctype Function (libc)

Check if a character is a control character
#iinncclluuddee <ccttyyppee.hh>
iinntt iissccnnttrrll(_c) iinntt _c;

iissccnnttrrll() tests whether the argument  _c is a control character (including a
newline character)  or a delete character.  It returns  a number other than
zero if _c is a control character, and zero if it is not.  iissccnnttrrll() assumes
that _c is an ASCII character or EEOOFF.

_E_x_a_m_p_l_e
For an example of how to use this macro, see the entry for ccttyyppee.hh.

_S_e_e _A_l_s_o
lliibbcc
ANSI Standard, section 7.3.1.3
POSIX Standard, section 8.1
