config root man

.\" Copyright (c) 1990, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 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
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     @(#)strxfrm.3	8.1 (Berkeley) 6/4/93
.\" FreeBSD: src/lib/libc/string/strxfrm.3,v 1.16 2002/09/06 11:24:06 tjr Exp
.\" $FreeBSD: release/9.1.0/lib/libc/string/wcsxfrm.3 165903 2007-01-09 00:28:16Z imp $
.\"
.Dd October 4, 2002
.Dt WCSXFRM 3
.Os
.Sh NAME
.Nm wcsxfrm
.Nd transform a wide string under locale
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In wchar.h
.Ft size_t
.Fn wcsxfrm "wchar_t * restrict dst" "const wchar_t * restrict src" "size_t n"
.Sh DESCRIPTION
The
.Fn wcsxfrm
function transforms a null-terminated wide character string pointed to by
.Fa src
according to the current locale collation order
then copies the transformed string
into
.Fa dst .
No more than
.Fa n
wide characters are copied into
.Fa dst ,
including the terminating null character added.
If
.Fa n
is set to 0
(it helps to determine an actual size needed
for transformation),
.Fa dst
is permitted to be a
.Dv NULL
pointer.
.Pp
Comparing two strings using
.Fn wcscmp
after
.Fn wcsxfrm
is equivalent to comparing
two original strings with
.Fn wcscoll .
.Sh RETURN VALUES
Upon successful completion,
.Fn wcsxfrm
returns the length of the transformed string not including
the terminating null character.
If this value is
.Fa n
or more, the contents of
.Fa dst
are indeterminate.
.Sh SEE ALSO
.Xr setlocale 3 ,
.Xr strxfrm 3 ,
.Xr wcscmp 3 ,
.Xr wcscoll 3
.Sh STANDARDS
The
.Fn wcsxfrm
function
conforms to
.St -isoC-99 .
.Sh BUGS
The current implementation of
.Fn wcsxfrm
only works in single-byte
.Dv LC_CTYPE
locales, and falls back to using
.Fn wcsncpy
in locales with extended character sets.
.Pp
Comparing two strings using
.Fn wcscmp
after
.Fn wcsxfrm
is
.Em not
always equivalent to comparison with
.Fn wcscoll ;
.Fn wcsxfrm
only stores information about primary collation weights into
.Fa dst ,
whereas
.Fn wcscoll
compares characters using both primary and secondary weights.