/* Message list charset and locale charset handling.
   Copyright (C) 2001-2003, 2005-2006 Free Software Foundation, Inc.
   Written by Bruno Haible <haible@clisp.cons.org>, 2001.

   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */


#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <alloca.h>

/* Specification.  */
#include "msgl-charset.h"

#include <stddef.h>
#include <string.h>

#include "po-charset.h"
#include "localcharset.h"
#include "error.h"
#include "progname.h"
#include "basename.h"
#include "xallocsa.h"
#include "xerror.h"
#include "xvasprintf.h"
#include "message.h"
#include "c-strstr.h"
#include "exit.h"
#include "gettext.h"

#define _(str) gettext (str)

void
compare_po_locale_charsets (const msgdomain_list_ty *mdlp)
{
  const char *locale_code;
  const char *canon_locale_code;
  bool warned;
  size_t j, k;

  /* Check whether the locale encoding and the PO file's encoding are the
     same.  Otherwise emit a warning.  */
  locale_code = locale_charset ();
  canon_locale_code = po_charset_canonicalize (locale_code);
  warned = false;
  for (k = 0; k < mdlp->nitems; k++)
    {
      const message_list_ty *mlp = mdlp->item[k]->messages;

      for (j = 0; j < mlp->nitems; j++)
	if (mlp->item[j]->msgstr == NULL
	    && mlp->item[j]->msgid[0] == '\0' && !mlp->item[j]->obsolete)
	  {
	    const char *header = mlp->item[j]->msgstr;

	    if (header != NULL)
	      {
		const char *charsetstr = c_strstr (header, "charset=");

		if (charsetstr != NULL)
		  {
		    size_t len;
		    char *charset;
		    const char *canon_charset;

		    charsetstr += strlen ("charset=");
		    len = strcspn (charsetstr, " \t\n");
		    charset = (char *) xallocsa (len + 1);
		    memcpy (charset, charsetstr, len);
		    charset[len] = '\0';

		    canon_charset = po_charset_canonicalize (charset);
		    if (canon_charset == NULL)
		      error (EXIT_FAILURE, 0,
			     _("\
present charset \"%s\" is not a portable encoding name"),
			     charset);
		    freesa (charset);
		    if (canon_locale_code != canon_charset)
		      {
			multiline_warning (xasprintf (_("warning: ")),
					   xasprintf (_("\
Locale charset \"%s\" is different from\n\
input file charset \"%s\".\n\
Output of '%s' might be incorrect.\n\
Possible workarounds are:\n\
"), locale_code, canon_charset, basename (program_name)));
			multiline_warning (NULL,
					   xasprintf (_("\
- Set LC_ALL to a locale with encoding %s.\n\
"), canon_charset));
			if (canon_locale_code != NULL)
			  multiline_warning (NULL,
					     xasprintf (_("\
- Convert the translation catalog to %s using 'msgconv',\n\
  then apply '%s',\n\
  then convert back to %s using 'msgconv'.\n\
"), canon_locale_code, basename (program_name), canon_charset));
			if (strcmp (canon_charset, "UTF-8") != 0
			    && (canon_locale_code == NULL
				|| strcmp (canon_locale_code, "UTF-8") != 0))
			  multiline_warning (NULL,
					     xasprintf (_("\
- Set LC_ALL to a locale with encoding %s,\n\
  convert the translation catalog to %s using 'msgconv',\n\
  then apply '%s',\n\
  then convert back to %s using 'msgconv'.\n\
"), "UTF-8", "UTF-8", basename (program_name), canon_charset));
			warned = true;
		      }
		  }
	      }
	  }
      }
  if (canon_locale_code == NULL && !warned)
    multiline_warning (xasprintf (_("warning: ")),
		       xasprintf (_("\
Locale charset \"%s\" is not a portable encoding name.\n\
Output of '%s' might be incorrect.\n\
A possible workaround is to set LC_ALL=C.\n\
"), locale_code, basename (program_name)));
}