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 | |
31 | iconv_t |
32 | iconv_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 | |