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ISSPACE(3) |
Library Functions Manual |
ISSPACE(3) |
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
-
And 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.