/* toutf8.c --- Convert strings from system locale into UTF-8. * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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 "striconv.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 /** * stringprep_locale_charset - return charset used in current locale * * Find out current locale charset. The function respect the CHARSET * environment variable, but typically uses nl_langinfo(CODESET) when * it is supported. It fall back on "ASCII" if CHARSET isn't set and * nl_langinfo isn't supported or return anything. * * Note that this function return the application's locale's preferred * charset (or thread's locale's preffered charset, if your system * support thread-specific locales). It does not return what the * system may be using. Thus, if you receive data from external * sources you cannot in general use this function to guess what * charset it is encoded in. Use stringprep_convert from the external * representation into the charset returned by this function, to have * data in the locale encoding. * * Return value: Return the character set used by the current locale. * It will never return NULL, but use "ASCII" as a fallback. **/ 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 /** * stringprep_convert - encode string using new character set * @str: input zero-terminated string. * @to_codeset: name of destination character set. * @from_codeset: name of origin character set, as used by @str. * * Convert the string from one character set to another using the * system's iconv() function. * * Return value: Returns newly allocated zero-terminated string which * is @str transcoded into to_codeset. **/ 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; 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 } /** * stringprep_locale_to_utf8 - convert locale encoded string to UTF-8 * @str: input zero terminated string. * * Convert string encoded in the locale's character set into UTF-8 by * using stringprep_convert(). * * Return value: Returns newly allocated zero-terminated string which * is @str transcoded into UTF-8. **/ char * stringprep_locale_to_utf8 (const char *str) { return stringprep_convert (str, "UTF-8", stringprep_locale_charset ()); } /** * stringprep_utf8_to_locale - encode UTF-8 string to locale encoding * @str: input zero terminated string. * * Convert string encoded in UTF-8 into the locale's character set by * using stringprep_convert(). * * Return value: Returns newly allocated zero-terminated string which * is @str transcoded into the locale's character set. **/ char * stringprep_utf8_to_locale (const char *str) { return stringprep_convert (str, stringprep_locale_charset (), "UTF-8"); }