NAME
isspace —
white-space character
test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isspace(
int
c);
DESCRIPTION
The
isspace() function tests for the standard white-space
characters for which
isalnum(3)
is false. The standard white-space characters are the following:
- ‘ ’
- Space character.
\f
- Form feed.
\n
- New-line.
\r
- Carriage return.
\t
- Horizontal tab.
\v
- Vertical tab.
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.