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ISCNTRL(3) |
Library Functions Manual |
ISCNTRL(3) |
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.