/* Copyright (C) 1995-1998, 2000, 2001 Free Software Foundation, Inc.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#include "elinks.h"

#include "intl/gettext/loadinfo.h"

/* On some strange systems still no definition of NULL is found.  Sigh!  */
#ifndef NULL
#if defined __STDC__ && __STDC__
#define NULL ((void *) 0)
#else
#define NULL 0
#endif
#endif

/* @@ end of prolog @@ */

unsigned char *
_nl_find_language(const unsigned char *name)
{
	while (name[0] != '\0' && name[0] != '_' && name[0] != '@'
	       && name[0] != '+' && name[0] != ',')
		++name;

	return (unsigned char *) name;
}

int
_nl_explode_name(unsigned char *name, const unsigned char **language, const unsigned char **modifier,
		 const unsigned char **territory, const unsigned char **codeset,
		 const unsigned char **normalized_codeset, const unsigned char **special,
		 const unsigned char **sponsor, const unsigned char **revision)
{
	enum { undecided, xpg, cen } syntax;
	unsigned char *cp;
	int mask;

	*modifier = NULL;
	*territory = NULL;
	*codeset = NULL;
	*normalized_codeset = NULL;
	*special = NULL;
	*sponsor = NULL;
	*revision = NULL;

	/* Now we determine the single parts of the locale name.  First
	   look for the language.  Termination symbols are `_' and `@' if
	   we use XPG4 style, and `_', `+', and `,' if we use CEN syntax.  */
	mask = 0;
	syntax = undecided;
	*language = cp = name;
	cp = _nl_find_language(*language);

	if (*language == cp)
		/* This does not make sense: language has to be specified.  Use
		   this entry as it is without exploding.  Perhaps it is an alias.  */
		cp = strchr(*language, '\0');
	else if (cp[0] == '_') {
		/* Next is the territory.  */
		cp[0] = '\0';
		*territory = ++cp;

		while (cp[0] != '\0' && cp[0] != '.' && cp[0] != '@'
		       && cp[0] != '+' && cp[0] != ',' && cp[0] != '_')
			++cp;

		mask |= TERRITORY;

		if (cp[0] == '.') {
			/* Next is the codeset.  */
			syntax = xpg;
			cp[0] = '\0';
			*codeset = ++cp;

			while (cp[0] != '\0' && cp[0] != '@')
				++cp;

			mask |= XPG_CODESET;

			if (*codeset != cp && (*codeset)[0] != '\0') {
				*normalized_codeset =
					_nl_normalize_codeset(*codeset,
							      cp - *codeset);
				if (strcmp(*codeset, *normalized_codeset) == 0)
					free((unsigned char *) *normalized_codeset);
				else
					mask |= XPG_NORM_CODESET;
			}
		}
	}

	if (cp[0] == '@' || (syntax != xpg && cp[0] == '+')) {
		/* Next is the modifier.  */
		syntax = cp[0] == '@' ? xpg : cen;
		cp[0] = '\0';
		*modifier = ++cp;

		while (syntax == cen && cp[0] != '\0' && cp[0] != '+'
		       && cp[0] != ',' && cp[0] != '_')
			++cp;

		mask |= XPG_MODIFIER | CEN_AUDIENCE;
	}

	if (syntax != xpg && (cp[0] == '+' || cp[0] == ',' || cp[0] == '_')) {
		syntax = cen;

		if (cp[0] == '+') {
			/* Next is special application (CEN syntax).  */
			cp[0] = '\0';
			*special = ++cp;

			while (cp[0] != '\0' && cp[0] != ',' && cp[0] != '_')
				++cp;

			mask |= CEN_SPECIAL;
		}

		if (cp[0] == ',') {
			/* Next is sponsor (CEN syntax).  */
			cp[0] = '\0';
			*sponsor = ++cp;

			while (cp[0] != '\0' && cp[0] != '_')
				++cp;

			mask |= CEN_SPONSOR;
		}

		if (cp[0] == '_') {
			/* Next is revision (CEN syntax).  */
			cp[0] = '\0';
			*revision = ++cp;

			mask |= CEN_REVISION;
		}
	}

	/* For CEN syntax values it might be important to have the
	   separator character in the file name, not for XPG syntax.  */
	if (syntax == xpg) {
		if (*territory != NULL && (*territory)[0] == '\0')
			mask &= ~TERRITORY;

		if (*codeset != NULL && (*codeset)[0] == '\0')
			mask &= ~XPG_CODESET;

		if (*modifier != NULL && (*modifier)[0] == '\0')
			mask &= ~XPG_MODIFIER;
	}

	return mask;
}