toutf8.c

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/* toutf8.c --- Convert strings from system locale into UTF-8.
   Copyright (C) 2002-2024 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 either:
 
     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at
       your option) any later version.
 
   or
 
     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at
       your option) any later version.
 
   or both in parallel, as here.
 
   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
   General Public License for more details.
 
   You should have received copies of the GNU General Public License and
   the GNU Lesser General Public License along with this program.  If
   not, see <https://www.gnu.org/licenses/>. */
 
#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 "striconv.h"
 
#ifdef _LIBC
# define HAVE_ICONV 1
# define HAVE_LOCALE_H 1
# define HAVE_LANGINFO_CODESET 1
#endif
 
#include <locale.h>
 
#ifdef 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 str_iconv (str, from_codeset, to_codeset);
#else
  char *p;
  (void) to_codeset;
  (void) from_codeset;
  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");
}