NAME
isspace —
whitespace character test
SYNOPSIS
#include
<ctype.h>
int
isspace(int
c);
DESCRIPTION
The
isspace()
function tests for the standard whitespace characters for which
isalnum(3) is false. The standard whitespace characters are the
following:
In the C locale,
isspace()
returns true only for the standard whitespace characters.
RETURN VALUES
The isspace() function returns zero if the
character tests false or non-zero if the character tests true.
SEE ALSO
isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
STANDARDS
The isspace() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
HISTORY
The isspace() function first appeared in
Version 7 AT&T UNIX.
CAVEATS
The argument to isspace() must be
EOF or representable as an unsigned
char; otherwise, the result is undefined.