freebsd-dev/lib/libc/locale/isblank.3

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.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
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.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
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.\" @(#)isblank.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
.Dd October 6, 2002
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.Dt ISBLANK 3
.Os
.Sh NAME
.Nm isblank
.Nd space or tab character test
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In ctype.h
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.Ft int
.Fn isblank "int c"
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.Sh DESCRIPTION
The
.Fn isblank
function tests for a space or tab character.
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For any locale, this includes the following standard characters:
.Pp
.Bl -column \&`\et''___ \&``\et''___
.It "\&``\et''\t`` ''"
.El
.Pp
In the "C" locale
.Fn isblank
successful test is limited to this characters only.
For single C
.Va char Ns s
locales (see
.Xr multibyte 3 )
the value of the argument is
representable as an
.Li unsigned char
or the value of
.Dv EOF .
.Sh COMPATIBILITY
Although
.Fn isblank
accepts arguments outside of the range of the
.Vt "unsigned char"
type in locales with large character sets,
this is a
.Bx 4.4
extension and the
.Fn iswblank
function should be used instead for maximum portability.
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.Sh RETURN VALUES
The
.Fn isblank
function returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr iswblank 3 ,
.Xr multibyte 3 ,
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.Xr ascii 7
.Sh STANDARDS
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The
.Fn isblank
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function
conforms to
.St -isoC-99 .