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.\" Copyright (c) 1994 Winning Strategies, Inc.
.\" All rights reserved.
.\"
.\" 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.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by Winning Strategies, Inc.
.\" 4. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
.\"
.\" $FreeBSD$
.Dd May 29, 1994
.Dt CATOPEN 3
.Os
.Sh NAME
.Nm catopen
.Nd open message catalog
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In nl_types.h
.Ft nl_catd
.Fn catopen "const char *name" "int oflag"
.Sh DESCRIPTION
The
.Fn catopen
function opens the message catalog specified by
.Fa name
and returns a message catalog descriptor.
If
.Fa name
contains a
.Sq /
then
.Fa name
specifies the full pathname for the message catalog, otherwise the value
of the environment variable
.Ev NLSPATH
is used with
the following substitutions:
.Bl -tag -width XXX
.It \&%N
The value of the
.Fa name
argument.
.It \&%L
The value of the
.Ev LANG
environment variable or the
.Dv LC_MESSAGES
category (see below).
.It \&%l
The language element from the
.Ev LANG
environment variable or from the
.Dv LC_MESSAGES
category.
.It \&%t
The territory element from the
.Ev LANG
environment variable or from the
.Dv LC_MESSAGES
category.
.It \&%c
The codeset element from the
.Ev LANG
environment variable or from the
.Dv LC_MESSAGES
category.
.It \&%%
A single % character.
.El
.Pp
An empty string is substituted for undefined values.
.Pp
Path names templates defined in
.Ev NLSPATH
are separated by colons
.No ( Sq \&: ) .
A leading or two adjacent colons
is equivalent to specifying %N.
.Pp
If the
.Fa oflag
argument is set to the
.Dv NL_CAT_LOCALE
constant,
.Dv LC_MESSAGES
locale category used to open the message catalog; using
.Dv NL_CAT_LOCALE
conforms to the
.St -xpg4
standard.
You can specify 0 for compatibility with
.St -xpg3 ;
when
.Fa oflag
is set to 0, the
.Ev LANG
environment variable
determines the message catalog locale.
.Pp
A message catalog descriptor
remains valid in a process until that process closes it, or
until a successful call to one of the
.Xr exec 3
function.
.Sh RETURN VALUES
Upon successful completion,
.Fn catopen
returns a message catalog descriptor.
Otherwise, (nl_catd) -1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EINVAL
Argument
.Fa name
does not point to a valid message catalog.
.It Bq Er ENAMETOOLONG
An entire path to the message catalog exceeded 1024 characters.
.It Bq Er ENOENT
The named message catalog does not exists, or the
.Fa name
argument points to an empty string.
.It Bq Er ENOMEM
Insufficient memory is available.
.El
.Sh SEE ALSO
.Xr gencat 1 ,
.Xr catclose 3 ,
.Xr catgets 3 ,
.Xr setlocale 3
.Sh STANDARDS
The
.Fn catopen
function conforms to
.St -xpg4 .
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