1 /* Get descriptor for character set conversion.
2 Copyright (C) 1997-2013 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library 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 The GNU C Library 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 the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
27 #include <gconv_int.h>
28 #include "gconv_charset.h"
32 iconv_open (const char *tocode, const char *fromcode)
34 /* Normalize the name. We remove all characters beside alpha-numeric,
35 '_', '-', '/', '.', and ':'. */
36 size_t tocode_len = strlen (tocode) + 3;
38 bool tocode_usealloca = __libc_use_alloca (tocode_len);
40 tocode_conv = (char *) alloca (tocode_len);
43 tocode_conv = (char *) malloc (tocode_len);
44 if (tocode_conv == NULL)
47 strip (tocode_conv, tocode);
48 tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0'
49 ? upstr (tocode_conv, tocode) : tocode_conv);
51 size_t fromcode_len = strlen (fromcode) + 3;
53 bool fromcode_usealloca = __libc_use_alloca (fromcode_len);
54 if (fromcode_usealloca)
55 fromcode_conv = (char *) alloca (fromcode_len);
58 fromcode_conv = (char *) malloc (fromcode_len);
59 if (fromcode_conv == NULL)
61 if (! tocode_usealloca)
66 strip (fromcode_conv, fromcode);
67 fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0'
68 ? upstr (fromcode_conv, fromcode) : fromcode_conv);
71 int res = __gconv_open (tocode, fromcode, &cd, 0);
73 if (! fromcode_usealloca)
75 if (! tocode_usealloca)
78 if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
80 /* We must set the error number according to the specs. */
81 if (res == __GCONV_NOCONV || res == __GCONV_NODB)