777bc09586
* iconvme.c: New file. * toutf8.c: Include stringprep.h first, to make the compiler check that stringprep.h is standalone. Improve comments. Replace #include of errno.h and sys/param.h with iconvme.h. Don't define ICONV_CONST. (stringprep_convert): Rewrite to use iconvme.h.
153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/* toutf8.c --- Convert strings from system locale into UTF-8.
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* Copyright (C) 2002, 2003, 2004, 2005 Simon Josefsson
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*
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* This file is part of GNU Libidn.
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*
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* GNU Libidn is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* GNU Libidn is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with GNU Libidn; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#if HAVE_CONFIG_H
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# include "config.h"
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#endif
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/* Get prototypes. */
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#include "stringprep.h"
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/* Get fprintf. */
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#include <stdio.h>
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/* Get getenv. */
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#include <stdlib.h>
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/* Get strlen. */
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#include <string.h>
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/* Get iconv_string. */
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#include "iconvme.h"
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#ifdef _LIBC
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# define HAVE_ICONV 1
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# define LOCALE_WORKS 1
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#endif
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#if LOCALE_WORKS
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# include <langinfo.h>
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# include <locale.h>
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#endif
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#ifdef _LIBC
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# define stringprep_locale_charset() nl_langinfo (CODESET)
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#else
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/**
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* stringprep_locale_charset - return charset used in current locale
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*
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* Find out current locale charset. The function respect the CHARSET
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* environment variable, but typically uses nl_langinfo(CODESET) when
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* it is supported. It fall back on "ASCII" if CHARSET isn't set and
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* nl_langinfo isn't supported or return anything.
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*
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* Note that this function return the application's locale's preferred
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* charset (or thread's locale's preffered charset, if your system
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* support thread-specific locales). It does not return what the
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* system may be using. Thus, if you receive data from external
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* sources you cannot in general use this function to guess what
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* charset it is encoded in. Use stringprep_convert from the external
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* representation into the charset returned by this function, to have
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* data in the locale encoding.
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*
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* Return value: Return the character set used by the current locale.
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* It will never return NULL, but use "ASCII" as a fallback.
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**/
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const char *
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stringprep_locale_charset (void)
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{
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const char *charset = getenv ("CHARSET"); /* flawfinder: ignore */
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if (charset && *charset)
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return charset;
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# ifdef LOCALE_WORKS
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charset = nl_langinfo (CODESET);
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if (charset && *charset)
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return charset;
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# endif
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return "ASCII";
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}
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#endif
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/**
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* stringprep_convert - encode string using new character set
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* @str: input zero-terminated string.
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* @to_codeset: name of destination character set.
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* @from_codeset: name of origin character set, as used by @str.
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*
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* Convert the string from one character set to another using the
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* system's iconv() function.
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*
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* Return value: Returns newly allocated zero-terminated string which
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* is @str transcoded into to_codeset.
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**/
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char *
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stringprep_convert (const char *str,
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const char *to_codeset, const char *from_codeset)
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{
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#if HAVE_ICONV
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return iconv_string (str, from_codeset, to_codeset);
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#else
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char *p;
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fprintf (stderr, "libidn: warning: libiconv not installed, cannot "
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"convert data to UTF-8\n");
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p = malloc (strlen (str) + 1);
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if (!p)
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return NULL;
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return strcpy (p, str);
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#endif
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}
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/**
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* stringprep_locale_to_utf8 - convert locale encoded string to UTF-8
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* @str: input zero terminated string.
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*
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* Convert string encoded in the locale's character set into UTF-8 by
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* using stringprep_convert().
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*
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* Return value: Returns newly allocated zero-terminated string which
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* is @str transcoded into UTF-8.
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**/
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char *
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stringprep_locale_to_utf8 (const char *str)
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{
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return stringprep_convert (str, "UTF-8", stringprep_locale_charset ());
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}
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/**
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* stringprep_utf8_to_locale - encode UTF-8 string to locale encoding
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* @str: input zero terminated string.
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*
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* Convert string encoded in UTF-8 into the locale's character set by
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* using stringprep_convert().
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*
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* Return value: Returns newly allocated zero-terminated string which
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* is @str transcoded into the locale's character set.
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**/
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char *
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stringprep_utf8_to_locale (const char *str)
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{
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return stringprep_convert (str, stringprep_locale_charset (), "UTF-8");
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}
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