freebsd-dev/lib/libc/string/strxfrm.3
Ed Maste 3fb3b97c4d Renumber clauses to reduce diffs to other versions
NetBSD, OpenBSD, and Android's Bionic number the clauses 1 through 3,
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.\" 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:
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.\" 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.
.\" 3. 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.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" @(#)strxfrm.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.Dt STRXFRM 3
.Os
.Sh NAME
.Nm strxfrm
.Nd transform a string under locale
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft size_t
.Fn strxfrm "char * restrict dst" "const char * restrict src" "size_t n"
.Ft size_t
.Fn strxfrm_l "char * restrict dst" "const char *restrict src" "size_t n" "locale_t loc"
.Sh DESCRIPTION
The
.Fn strxfrm
function transforms a null-terminated string pointed to by
.Fa src
according to the current locale collation if any,
then copies the transformed string
into
.Fa dst .
Not more than
.Fa n
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 NULL pointer.
.Pp
Comparing two strings using
.Fn strcmp
after
.Fn strxfrm
is equal to comparing
two original strings with
.Fn strcoll .
.Pp
.Fn strxfrm_l
does the same, however takes an explicit locale rather than the global
locale.
.Sh RETURN VALUES
Upon successful completion,
.Fn strxfrm
and
.Fn strxfrm_l
return 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 strcmp 3 ,
.Xr strcoll 3 ,
.Xr wcsxfrm 3
.Sh STANDARDS
The
.Fn strxfrm
function
conforms to
.St -isoC .
The
.Fn strxfrm_l
function conforms to
.St -p1003.1-2008 .