(gettext) Libraries

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 4.9 Preparing Library Sources
 When you are preparing a library, not a program, for the use of
 `gettext', only a few details are different.  Here we assume that the
 library has a translation domain and a POT file of its own.  (If it
 uses the translation domain and POT file of the main program, then the
 previous sections apply without changes.)
   1. The library code doesn't call `setlocale (LC_ALL, "")'.  It's the
      responsibility of the main program to set the locale.  The
      library's documentation should mention this fact, so that
      developers of programs using the library are aware of it.
   2. The library code doesn't call `textdomain (PACKAGE)', because it
      would interfere with the text domain set by the main program.
   3. The initialization code for a program was
             setlocale (LC_ALL, "");
             bindtextdomain (PACKAGE, LOCALEDIR);
             textdomain (PACKAGE);
      For a library it is reduced to
             bindtextdomain (PACKAGE, LOCALEDIR);
      If your library's API doesn't already have an initialization
      function, you need to create one, containing at least the
      `bindtextdomain' invocation.  However, you usually don't need to
      export and document this initialization function: It is sufficient
      that all entry points of the library call the initialization
      function if it hasn't been called before.  The typical idiom used
      to achieve this is a static boolean variable that indicates
      whether the initialization function has been called. Like this:
           static bool libfoo_initialized;
           static void
           libfoo_initialize (void)
             bindtextdomain (PACKAGE, LOCALEDIR);
             libfoo_initialized = true;
           /* This function is part of the exported API.  */
           struct foo *
           create_foo (...)
             /* Must ensure the initialization is performed.  */
             if (!libfoo_initialized)
               libfoo_initialize ();
           /* This function is part of the exported API.  The argument must be
              non-NULL and have been created through create_foo().  */
           foo_refcount (struct foo *argument)
             /* No need to invoke the initialization function here, because
                create_foo() must already have been called before.  */
   4. The usual declaration of the `_' macro in each source file was
           #include <libintl.h>
           #define _(String) gettext (String)
      for a program.  For a library, which has its own translation
      domain, it reads like this:
           #include <libintl.h>
           #define _(String) dgettext (PACKAGE, String)
      In other words, `dgettext' is used instead of `gettext'.
      Similarly, the `dngettext' function should be used in place of the
      `ngettext' function.
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