April 17, 2008 ISSPACE 3

### NAME

isspace - white-space character test

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```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 otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details.