toutf8.c

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/* toutf8.c --- Convert strings from system locale into UTF-8.
 * Copyright (C) 2002, 2003, 2004, 2005  Simon Josefsson
 *
 * This file is part of GNU Libidn.
 *
 * GNU Libidn is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * GNU Libidn 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with GNU Libidn; 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

/* Get prototypes. */
#include "stringprep.h"

/* Get fprintf. */
#include <stdio.h>

/* Get getenv. */
#include <stdlib.h>

/* Get strlen. */
#include <string.h>

/* Get iconv_string. */
#include "iconvme.h"

#ifdef _LIBC
# define HAVE_ICONV 1
# define HAVE_LOCALE_H 1
# define HAVE_LANGINFO_CODESET 1
#endif

#if HAVE_LOCALE_H
# include <locale.h>
#endif

#if HAVE_LANGINFO_CODESET
# include <langinfo.h>
#endif

#ifdef _LIBC
# define stringprep_locale_charset() nl_langinfo (CODESET)
#else

const char *
stringprep_locale_charset (void)
{
  const char *charset = getenv ("CHARSET");     /* flawfinder: ignore */

  if (charset && *charset)
    return charset;

# ifdef HAVE_LANGINFO_CODESET
  charset = nl_langinfo (CODESET);

  if (charset && *charset)
    return charset;
# endif

  return "ASCII";
}
#endif

char *
stringprep_convert (const char *str,
                    const char *to_codeset, const char *from_codeset)
{
#if HAVE_ICONV
  return iconv_string (str, from_codeset, to_codeset);
#else
  char *p;
  fprintf (stderr, "libidn: warning: libiconv not installed, cannot "
           "convert data to UTF-8\n");
  p = malloc (strlen (str) + 1);
  if (!p)
    return NULL;
  return strcpy (p, str);
#endif
}

char *
stringprep_locale_to_utf8 (const char *str)
{
  return stringprep_convert (str, "UTF-8", stringprep_locale_charset ());
}

char *
stringprep_utf8_to_locale (const char *str)
{
  return stringprep_convert (str, stringprep_locale_charset (), "UTF-8");
}

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