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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/LibIDN/src/toutf8.c
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+/* 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");
+}