Updated to fedora-glibc-20071014T1847
[glibc.git] / iconv / iconv_open.c
blobe4fed93ecb8eb0facdcd43101240a0fccc594037
1 /* Get descriptor for character set conversion.
2 Copyright (C) 1997,1998,1999,2000,2001,2007 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, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #include <alloca.h>
22 #include <errno.h>
23 #include <iconv.h>
24 #include <stdbool.h>
25 #include <stdlib.h>
26 #include <string.h>
28 #include <gconv_int.h>
29 #include "gconv_charset.h"
32 iconv_t
33 iconv_open (const char *tocode, const char *fromcode)
35 /* Normalize the name. We remove all characters beside alpha-numeric,
36 '_', '-', '/', '.', and ':'. */
37 size_t tocode_len = strlen (tocode) + 3;
38 char *tocode_conv;
39 bool tocode_usealloca = __libc_use_alloca (tocode_len);
40 if (tocode_usealloca)
41 tocode_conv = (char *) alloca (tocode_len);
42 else
44 tocode_conv = (char *) malloc (tocode_len);
45 if (tocode_conv == NULL)
46 return (iconv_t) -1;
48 strip (tocode_conv, tocode);
49 tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0'
50 ? upstr (tocode_conv, tocode) : tocode_conv);
52 size_t fromcode_len = strlen (fromcode) + 3;
53 char *fromcode_conv;
54 bool fromcode_usealloca = __libc_use_alloca (fromcode_len);
55 if (fromcode_usealloca)
56 fromcode_conv = (char *) alloca (fromcode_len);
57 else
59 fromcode_conv = (char *) malloc (fromcode_len);
60 if (fromcode_conv == NULL)
62 if (! tocode_usealloca)
63 free (tocode_conv);
64 return (iconv_t) -1;
67 strip (fromcode_conv, fromcode);
68 fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0'
69 ? upstr (fromcode_conv, fromcode) : fromcode_conv);
71 __gconv_t cd;
72 int res = __gconv_open (tocode, fromcode, &cd, 0);
74 if (! fromcode_usealloca)
75 free (fromcode_conv);
76 if (! tocode_usealloca)
77 free (tocode_conv);
79 if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
81 /* We must set the error number according to the specs. */
82 if (res == __GCONV_NOCONV || res == __GCONV_NODB)
83 __set_errno (EINVAL);
85 cd = (iconv_t) -1;
88 return (iconv_t) cd;