NAME
isspace —
white-space character test
LIBRARY
library “libc”
SYNOPSIS
#include
<ctype.h>
int
isspace(int
c);
DESCRIPTION
Theisspace()
function tests for the standard white-space characters for which
isalnum(3) is false. The standard white-space characters are the
following:
In the
``C'' locale,
isspace()
returns true only for the standard white-space characters.
RETURN VALUES
The isspace() 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), 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”).
CAVEATS
The argument to isspace() must be
EOF or representable as an unsigned
char; otherwise, the behavior is undefined. See the
CAVEATS section of
ctype(3) for more details.