119 lines
3.4 KiB
Groff
119 lines
3.4 KiB
Groff
.\" $NetBSD: isspace.3,v 1.9 2002/07/10 14:37:14 yamt Exp $
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.\"
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.\" Copyright (c) 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)isspace.3 5.3 (Berkeley) 7/31/91
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.\"
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.Dd July 31, 1991
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.Dt ISSPACE 3
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.Os
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.Sh NAME
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.Nm isspace
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.Nd white-space character test
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include \*[Lt]ctype.h\*[Gt]
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.Ft int
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.Fn isspace "int c"
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.Sh DESCRIPTION
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The
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.Fn isspace
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function tests for the standard white-space characters
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.\" or for any
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.\" of an implementation-defined set of characters
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for which
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.Xr isalnum 3
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is false.
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The standard white-space characters are the following:
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.Pp
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.Bl -tag -width xxxxx -offset indent -compact
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.It Sq \0
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Space character.
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.It Li \ef
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Form feed.
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.It Li \en
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New-line.
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.It Li \er
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Carriage return.
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.It Li \et
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Horizontal tab.
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.It Li \ev
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And vertical tab.
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.El
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.Pp
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In the
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.Em ``C''
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locale,
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.Fn isspace
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returns true only for the standard white-space characters.
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.Sh RETURN VALUES
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The
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.Fn isspace
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macro returns zero if the character tests false and
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returns non-zero if the character tests true.
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.Sh SEE ALSO
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.Xr isalnum 3 ,
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.Xr isalpha 3 ,
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.Xr isascii 3 ,
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.Xr isblank 3 ,
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.Xr iscntrl 3 ,
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.Xr isdigit 3 ,
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.Xr isgraph 3 ,
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.Xr islower 3 ,
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.Xr isprint 3 ,
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.Xr ispunct 3 ,
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.Xr isupper 3 ,
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.Xr isxdigit 3 ,
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.Xr stdio 3 ,
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.Xr toascii 3 ,
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.Xr tolower 3 ,
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.Xr toupper 3 ,
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.Xr ascii 7
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.Sh STANDARDS
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The
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.Fn isspace
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function conforms to
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.St -ansiC .
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.Sh CAVEATS
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The argument to
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.Fn isspace
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must be
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.Dv EOF
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or representable as an
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.Li unsigned char ;
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otherwise, the result is undefined.
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