1 /* toutf8.c --- Convert strings from system locale into UTF-8.
2 * Copyright (C) 2002, 2003, 2004, 2005 Simon Josefsson
4 * This file is part of GNU Libidn.
6 * GNU Libidn is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * GNU Libidn is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with GNU Libidn; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include "stringprep.h"
38 /* Get __OPTION_EGLIBC_LOCALE_CODE. */
40 # include <gnu/option-groups.h>
43 /* Get iconv_string. */
48 # define LOCALE_WORKS 1
52 # include <langinfo.h>
57 # if __OPTION_EGLIBC_LOCALE_CODE
58 # define stringprep_locale_charset() nl_langinfo (CODESET)
60 # define stringprep_locale_charset() "ANSI_X3.4-1968"
64 * stringprep_locale_charset - return charset used in current locale
66 * Find out current locale charset. The function respect the CHARSET
67 * environment variable, but typically uses nl_langinfo(CODESET) when
68 * it is supported. It fall back on "ASCII" if CHARSET isn't set and
69 * nl_langinfo isn't supported or return anything.
71 * Note that this function return the application's locale's preferred
72 * charset (or thread's locale's preffered charset, if your system
73 * support thread-specific locales). It does not return what the
74 * system may be using. Thus, if you receive data from external
75 * sources you cannot in general use this function to guess what
76 * charset it is encoded in. Use stringprep_convert from the external
77 * representation into the charset returned by this function, to have
78 * data in the locale encoding.
80 * Return value: Return the character set used by the current locale.
81 * It will never return NULL, but use "ASCII" as a fallback.
84 stringprep_locale_charset (void)
86 const char *charset = getenv ("CHARSET"); /* flawfinder: ignore */
88 if (charset && *charset)
92 charset = nl_langinfo (CODESET);
94 if (charset && *charset)
103 * stringprep_convert - encode string using new character set
104 * @str: input zero-terminated string.
105 * @to_codeset: name of destination character set.
106 * @from_codeset: name of origin character set, as used by @str.
108 * Convert the string from one character set to another using the
109 * system's iconv() function.
111 * Return value: Returns newly allocated zero-terminated string which
112 * is @str transcoded into to_codeset.
115 stringprep_convert (const char *str,
116 const char *to_codeset, const char *from_codeset)
119 return iconv_string (str, from_codeset, to_codeset);
122 fprintf (stderr, "libidn: warning: libiconv not installed, cannot "
123 "convert data to UTF-8\n");
124 p = malloc (strlen (str) + 1);
127 return strcpy (p, str);
132 * stringprep_locale_to_utf8 - convert locale encoded string to UTF-8
133 * @str: input zero terminated string.
135 * Convert string encoded in the locale's character set into UTF-8 by
136 * using stringprep_convert().
138 * Return value: Returns newly allocated zero-terminated string which
139 * is @str transcoded into UTF-8.
142 stringprep_locale_to_utf8 (const char *str)
144 return stringprep_convert (str, "UTF-8", stringprep_locale_charset ());
148 * stringprep_utf8_to_locale - encode UTF-8 string to locale encoding
149 * @str: input zero terminated string.
151 * Convert string encoded in UTF-8 into the locale's character set by
152 * using stringprep_convert().
154 * Return value: Returns newly allocated zero-terminated string which
155 * is @str transcoded into the locale's character set.
158 stringprep_utf8_to_locale (const char *str)
160 return stringprep_convert (str, stringprep_locale_charset (), "UTF-8");