.\"
.\" Copyright (c) 2004 Tim J. Robbins
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" $FreeBSD: head/lib/libc/locale/isrune.3 196820 2009-09-04 07:44:58Z des $
.\"
.Dd March 30, 2004
.Dt ISRUNE 3
.Os
.Sh NAME
.Nm isrune
.Nd valid character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isrune "int c"
.Sh DESCRIPTION
The
.Fn isrune
function tests for any character that is valid in the current
character set.
In the
.Tn ASCII
character set, this is equivalent to
.Fn isascii .
.Sh RETURN VALUES
The
.Fn isrune
function returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr isascii 3 ,
.Xr iswrune 3 ,
.Xr ascii 7
.Sh HISTORY
The
.Fn isrune
function appeared in
.Bx 4.4 .