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`
  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.

April 17, 2008 | NetBSD 9.1