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Date: Sat, 17 Mar 2012 16:38:05 +0200
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: GNU gettext
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> From: Georg <dosusb AT googlemail DOT com>
> Date: Sat, 17 Mar 2012 03:48:00 -0700 (PDT)
> 
> I am porting a program from Linux to DOS. This then uses my FLTK for
> DOS port which allows to display UTF8 characters using an ISO10646
> truetype font.
> 
> The linux program uses "gettext" to allow to display the menu items in
> different languages. There is a "po" directory with files for these
> different languages.
> 
> In "main.cpp" there are the following commands:
> 
> // GNU gettext initialization
> setlocale(LC_MESSAGES, "");
> bindtextdomain(PACKAGE, LOCALEDIR);
> textdomain(PACKAGE);
> 
> Within the other program files which define the menus there is
> defined:
> 
> #define _(String) gettext((String))
> 
> this refers to e.g. this command:
> fl_alert(_("Cannot open file..."));
> 
> DJGPP/libintl compiles the programs fine but I am not sure what it
> actually does when executing the commands mentioned above.

It calls the `gettext' function (through the _ macro), which looks up
the string "Cannot open file..." in the message catalog for the
current language, and returns its translation.  So fl_alert will
display the translated message.

> Can I use the DJGPP version of "gettext" in my situation and if yes,
> how?

It depends on how you did the font stuff.  gettext assumes that if you
send an iso8859-1 code to the screen, the corresponding iso8859-1
character is displayed (and the same with any other character set).

> If I get "gettext" to work, can it be used with a command line option
> or a menu in the program to allow to select the desired language?

You will need to call setlocale and bindtextdomain based on those
options, then it should work.