/*

	local: some stuff for localisation

	Currently, this is just about determining if we got UTF-8 locale.

	copyright 2008 by the mpg123 project - free software under the terms of the LGPL 2.1

	see COPYING and AUTHORS files in distribution or http://mpg123.org

	initially written by Thomas Orgis, based on a patch by Thorsten Glaser.

*/

#include "config.h"

#ifdef HAVE_LOCALE_H

#include <locale.h>

#endif

#ifdef HAVE_LANGINFO_H

#include <langinfo.h>

#endif

#include "compat.h"

#include "mpg123app.h"

#include "debug.h"

int utf8env = 0;

/* Check some language variable for UTF-8-ness. */

static int is_utf8(const char *lang);

void check_locale(void)

{

	if(param.force_utf8) utf8env = 1;

	else

	{

		const char *cp;

		/* Check for env vars in proper oder. */

		if((cp = getenv("LC_ALL")) == NULL && (cp = getenv("LC_CTYPE")) == NULL)

		cp = getenv("LANG");

		if(is_utf8(cp)) utf8env = 1;

	}

#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)

	/* To query, we need to set from environment... */

	if(!utf8env && is_utf8(setlocale(LC_CTYPE, ""))) utf8env = 1;

#endif

#if defined(HAVE_NL_LANGINFO) && defined(CODESET)

	/* ...langinfo works after we set a locale, eh? So it makes sense after setlocale, if only. */

	if(!utf8env && is_utf8(nl_langinfo(CODESET))) utf8env = 1;

#endif

	debug1("UTF-8 locale: %i", utf8env);

}

static int is_utf8(const char *lang)

{

	if(lang == NULL) return 0;

	/* Now, if the variable mentions UTF-8 anywhere, in some variation, the locale is UTF-8. */

	if(   strstr(lang, "UTF-8") || strstr(lang, "utf-8")

	   || strstr(lang, "UTF8")  || strstr(lang, "utf8")  )

	return 1;

	else

	return 0;

}