1/* Get descriptor for character set conversion.
2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5
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.
10
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.
15
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/>. */
19
20#include <alloca.h>
21#include <errno.h>
22#include <iconv.h>
23#include <stdbool.h>
24#include <stdlib.h>
25#include <string.h>
26
27#include <gconv_int.h>
28#include "gconv_charset.h"
29
30
31iconv_t
32iconv_open (const char *tocode, const char *fromcode)
33{
34 /* Normalize the name. We remove all characters beside alpha-numeric,
35 '_', '-', '/', '.', and ':'. */
36 size_t tocode_len = strlen (tocode) + 3;
37 char *tocode_conv;
38 bool tocode_usealloca = __libc_use_alloca (tocode_len);
39 if (tocode_usealloca)
40 tocode_conv = (char *) alloca (tocode_len);
41 else
42 {
43 tocode_conv = (char *) malloc (tocode_len);
44 if (tocode_conv == NULL)
45 return (iconv_t) -1;
46 }
47 strip (tocode_conv, tocode);
48 tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0'
49 ? upstr (tocode_conv, tocode) : tocode_conv);
50
51 size_t fromcode_len = strlen (fromcode) + 3;
52 char *fromcode_conv;
53 bool fromcode_usealloca = __libc_use_alloca (fromcode_len);
54 if (fromcode_usealloca)
55 fromcode_conv = (char *) alloca (fromcode_len);
56 else
57 {
58 fromcode_conv = (char *) malloc (fromcode_len);
59 if (fromcode_conv == NULL)
60 {
61 if (! tocode_usealloca)
62 free (tocode_conv);
63 return (iconv_t) -1;
64 }
65 }
66 strip (fromcode_conv, fromcode);
67 fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0'
68 ? upstr (fromcode_conv, fromcode) : fromcode_conv);
69
70 __gconv_t cd;
71 int res = __gconv_open (tocode, fromcode, &cd, 0);
72
73 if (! fromcode_usealloca)
74 free (fromcode_conv);
75 if (! tocode_usealloca)
76 free (tocode_conv);
77
78 if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
79 {
80 /* We must set the error number according to the specs. */
81 if (res == __GCONV_NOCONV || res == __GCONV_NODB)
82 __set_errno (EINVAL);
83
84 cd = (iconv_t) -1;
85 }
86
87 return (iconv_t) cd;
88}
89