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.\" $OpenBSD: uselocale.3,v 1.1 2017/09/05 03:16:13 schwarze Exp $
.\"
.\" Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: September 5 2017 $
.Dt USELOCALE 3
.Os
.Sh NAME
.Nm uselocale
.Nd select the locale for the current thread
.Sh SYNOPSIS
.In locale.h
.Ft locale_t
.Fo uselocale
.Fa "locale_t newloc"
.Fc
.Sh DESCRIPTION
The function
.Fn uselocale
selects
.Fa newloc
for use by functions in the current thread that do not take a
.Vt locale_t
argument.
Neither the global locale set by
.Xr setlocale 3
nor locales used by other threads change.
.Pp
The current thread uses
.Fa newloc
until
.Fn uselocale
is called again successfully with a non-null argument
in the same thread, and passing
.Fa newloc
to
.Xr freelocale 3
or
.Xr newlocale 3
before that results in undefined behaviour.
.Pp
To revoke the use of
.Fa newloc
in the current thread without installing another thread-specific locale,
instead reverting to the global locale, call
.Fn uselocale
with the special argument
.Dv LC_GLOBAL_LOCALE .
.Pp
When called with the argument
.Po Vt locale_t Pc Ns 0 ,
the thread-specific locale remains unchanged.
.Sh RETURN VALUES
The function
.Fn uselocale
returns the thread-specific locale which is in use right before the call,
or the special return value
.Dv LC_GLOBAL_LOCALE
if the thread used the global locale before the call.
.Sh ERRORS
The function
.Fn uselocale
fails if:
.Bl -tag -width Er
.It Bq Er EINVAL
The
.Fa newloc
argument is neither a valid locale object nor
.Po Vt locale_t Pc Ns 0 .
.El
.Sh SEE ALSO
.Xr iswalnum 3 ,
.Xr iswctype 3 ,
.Xr newlocale 3 ,
.Xr towctrans 3 ,
.Xr towlower 3 ,
.Xr wcscasecmp 3 ,
.Xr wctrans 3 ,
.Xr wctype 3
.Sh STANDARDS
The function
.Fn uselocale
conforms to
.St -p1003.1-2008 .
.Sh HISTORY
The function
.Fn uselocale
has been available since
.Ox 6.2 .
|
