freebsd-skq/lib/libc/locale/isblank.3
Bruce Evans 87e0032026 Removed assertion that isblank() conforms to C90 too. This assertion
is correct but less than useful.  There is some uncertainty about whether
isblank() is in C99, but it is certainly not in C90.  It just conforms
to C89 because it is a conforming extension.
2002-01-11 15:21:03 +00:00

78 lines
2.7 KiB
Groff

.\" Copyright (c) 1991, 1993
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.\" @(#)isblank.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.Dt ISBLANK 3
.Os
.Sh NAME
.Nm isblank
.Nd space or tab character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isblank "int c"
.Sh DESCRIPTION
The
.Fn isblank
function tests for a space or tab character.
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 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 multibyte 3 ,
.Xr ascii 7