127 lines
3.7 KiB
Groff
127 lines
3.7 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. 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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.\" Chris Torek and the American National Standards Committee X3,
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.\" on Information 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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.\" @(#)strxfrm.3 8.1 (Berkeley) 6/4/93
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.\" FreeBSD: src/lib/libc/string/strxfrm.3,v 1.16 2002/09/06 11:24:06 tjr Exp
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.\" $FreeBSD$
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.\"
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.Dd October 4, 2002
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.Dt WCSXFRM 3
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.Os
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.Sh NAME
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.Nm wcsxfrm
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.Nd transform a wide string under locale
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In wchar.h
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.Ft size_t
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.Fn wcsxfrm "wchar_t * restrict dst" "const wchar_t * restrict src" "size_t n"
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.Sh DESCRIPTION
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The
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.Fn wcsxfrm
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function transforms a null-terminated wide character string pointed to by
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.Fa src
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according to the current locale collation order
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then copies the transformed string
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into
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.Fa dst .
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No more than
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.Fa n
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wide characters are copied into
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.Fa dst ,
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including the terminating null character added.
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If
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.Fa n
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is set to 0
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(it helps to determine an actual size needed
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for transformation),
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.Fa dst
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is permitted to be a
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.Dv NULL
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pointer.
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.Pp
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Comparing two strings using
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.Fn wcscmp
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after
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.Fn wcsxfrm
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is equivalent to comparing
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two original strings with
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.Fn wcscoll .
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn wcsxfrm
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returns the length of the transformed string not including
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the terminating null character.
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If this value is
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.Fa n
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or more, the contents of
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.Fa dst
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are indeterminate.
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.Sh SEE ALSO
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.Xr setlocale 3 ,
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.Xr strxfrm 3 ,
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.Xr wcscmp 3 ,
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.Xr wcscoll 3
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.Sh STANDARDS
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The
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.Fn wcsxfrm
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function
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conforms to
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.St -isoC-99 .
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.Sh BUGS
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The current implementation of
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.Fn wcsxfrm
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only works in single-byte
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.Dv LC_CTYPE
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locales, and falls back to using
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.Fn wcsncpy
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in locales with extended character sets.
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.Pp
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Comparing two strings using
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.Fn wcscmp
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after
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.Fn wcsxfrm
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is
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.Em not
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always equivalent to comparison with
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.Fn wcscoll ;
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.Fn wcsxfrm
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only stores information about primary collation weights into
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.Fa dst ,
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whereas
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.Fn wcscoll
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compares characters using both primary and secondary weights.
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