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.TH XpSetLocaleHinter 3Xp __xorgversion__ "XPRINT FUNCTIONS"
.SH NAME
XpSetLocaleHinter \-  Sets a "locale hinter" function and description of it.
.SH SYNOPSIS
.br
      cc [ flag... ] file... -lXp [ library... ]	
.br
      #include <X11/extensions/Print.h>
.LP    
.B void XpSetLocaleHinter 
(
.I hinter_proc
.I hinter_desc
)
.br
      XPHinterProc \fIhinter_proc\fP\^;
.br
      char *\fIhinter_desc\fP\^;
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I hinter_proc
A pointer to a "hinter proc".
.TP
.I hinter_desc
A pointer to contextual information about the locale hinter proc.
.SH DESCRIPTION
.LP
Since (to date) there is no single industry standard for locale values, locale 
information about the current client required by XpCreateContext, 
XpGetPrinterList 
and XpGetPdmStartParams is at best considered a "hint" when transmitted to the X 
Print Server and PDM. In single vendor environments, the locale hint should be 
consistent and understood. In multi-vendor environments however, the locale hint 
may or may not be understood. The caller locale will be used as the fallback 
default.

XpSetLocaleHinter and XpGetLocaleHinter access hooks that are used to register 
more advanced hint generators. By default, Xp uses a hinter proc that calls 
setlocale on  the CTYPE category on POSIX systems, and 
.I hinter_desc 
is NULL.

XpSetLocaleHinter sets the 
.I hinter_proc 
and 
.I hinter_desc 
which will be subsequently used by the Xp calls requiring a locale hint (see 
above). 
.I hinter_proc 
is the function that will generate the locale hint (for example, 
"C"), and 
.I hinter_desc 
is a string, with or without the embeddable keyword %locale%, that provides a 
higher level context for the results of 
.I hinter_proc.

If 
.I hinter_proc 
is set to NULL, then the default Xp hinter proc is installed. 
XpSetLocaleHinter makes its own private copy of 
.I hinter_desc 
prior to returning.

An example set call might look as follows:

.nf
    XpSetLocaleHinter( my_hinter, "%locale%;CDElocale" );
.fi

Where my_hinter might look as follows:

.nf
   char *my_hinter()
   {
       /\(**
        * Use setlocale() to retrieve the current locale.
        */
       return( my_x_strdup( setlocale(LC_CTYPE, (char *) NULL) ) );
   }
   
.fi


When the client's locale is needed, if both 
.I hinter_desc 
and the results of 
.I hinter_proc 
are non-NULL, and the keyword %locale% is found in 
.I hinter_desc, 
then the keyword will be replaced with the result of 
.I hinter_proc. 
The resulting string will be used as the locale hint by the Xp calls.

If both 
.I hinter_desc 
and the results of 
.I hinter_proc 
are non-NULL, but the keyword %locale% is not found in 
.I hinter_desc, 
then 
.I hinter_desc, 
as is, becomes the string used as the locale hint by the Xp calls.

If one of 
.I hinter_desc 
or the results of 
.I hinter_proc 
is NULL, then the other non-NULL value becomes the string used as the locale 
hint by the Xp calls.

If 
.I hinter_desc 
and the results of 
.I hinter_proc 
are NULL, then a NULL (i.e. (char *) NULL) locale hint is sent by the Xp calls.

The syntax for 
.I hinter_desc 
is a variation of the unadopted X/Open standard for a "String Network 
Locale-Specification Syntax" (X/Open, Distributed Internationalization Services, 
Version 2, 1994 Snapshot). The Xp 
.I hinter_desc 
syntax is:

.nf
    name_spec[;registry_spec[;ver_spec[;encoding_spec]]]

.fi
 
In Xp, the first item is the locale name, followed by progressively more 
detailed information about the locale name, with each piece of information 
separated by a `;'.
.SH STRUCTURES
The signature for 
.I hinter_proc 
is defined in <X11/extensions/Print.h> as follows:

.nf
    typedef char * (*XPHinterProc)();
    
.fi
.I hinter_proc 
is expected to return a string that can be freed using XFree by the Xp calls 
themselves.

Some examples include (
.I hinter_desc 
to left, expanded results to the right):

.nf
    CFRENCH                                CFRENCH
    %locale%                               C
    %locale%;CDElocale                     C;CDElocale
    %locale%;HP                            C;HP
    %locale%;IBM                           C;IBM
    %locale%;XOPEN;01_11;XFN-001001        de_DE;XOPEN;01_11;XFN-001001
    
.fi   
.SH FILES
.PD 0
.TP 20
<X11/extensions/Print.h>
.SH "SEE ALSO"
.BR XpCreateContext (3Xp),
.BR XpGetLocaleHinter (3Xp),
.BR XpGetPdmStartParams (3Xp),
.BR XpGetPrinterList (3Xp),
.BR XpSetLocaleHinter (3Xp)

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