NAME    [Toc]    [Back]

     iscntrl - control character test

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     iscntrl(int c);

DESCRIPTION    [Toc]    [Back]

     The iscntrl() function tests for any control character.

RETURN VALUES    [Toc]    [Back]

     The iscntrl() macro returns  zero  if  the  character  tests
false or non-zero
     if the character tests true.

SEE ALSO    [Toc]    [Back]

     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    [Toc]    [Back]

     The  iscntrl() function conforms to ANSI X3.159-1989 (``ANSI
C'').

CAVEATS    [Toc]    [Back]

     The argument to iscntrl() must be EOF or representable as an
unsigned
     char; otherwise, the result is undefined.

OpenBSD      3.6                           June      29,     1991