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6973fc01 | 1 | /* Get descriptor for character set conversion. |
d4697bc9 | 2 | Copyright (C) 1997-2014 Free Software Foundation, Inc. |
6973fc01 UD |
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 | |
41bdb6e2 AJ |
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. | |
6973fc01 UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
6973fc01 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
6973fc01 | 19 | |
dec9ed9e | 20 | #include <alloca.h> |
6973fc01 UD |
21 | #include <errno.h> |
22 | #include <iconv.h> | |
dec9ed9e | 23 | #include <stdbool.h> |
6591c335 | 24 | #include <stdlib.h> |
f43ce637 | 25 | #include <string.h> |
6973fc01 | 26 | |
e62c19f1 | 27 | #include <gconv_int.h> |
ee62473f | 28 | #include "gconv_charset.h" |
bd4848fb UD |
29 | |
30 | ||
6973fc01 UD |
31 | iconv_t |
32 | iconv_open (const char *tocode, const char *fromcode) | |
33 | { | |
f43ce637 | 34 | /* Normalize the name. We remove all characters beside alpha-numeric, |
ba508da3 | 35 | '_', '-', '/', '.', and ':'. */ |
dec9ed9e UD |
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 | } | |
e34b0f29 | 47 | strip (tocode_conv, tocode); |
e0e86ccb UD |
48 | tocode = (tocode_conv[2] == '\0' && tocode[0] != '\0' |
49 | ? upstr (tocode_conv, tocode) : tocode_conv); | |
f43ce637 | 50 | |
dec9ed9e UD |
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 | } | |
e34b0f29 | 66 | strip (fromcode_conv, fromcode); |
e0e86ccb | 67 | fromcode = (fromcode_conv[2] == '\0' && fromcode[0] != '\0' |
256846bb | 68 | ? upstr (fromcode_conv, fromcode) : fromcode_conv); |
f43ce637 | 69 | |
dec9ed9e UD |
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); | |
6973fc01 | 77 | |
a711dd4b | 78 | if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK) |
6973fc01 UD |
79 | { |
80 | /* We must set the error number according to the specs. */ | |
d64b6ad0 | 81 | if (res == __GCONV_NOCONV || res == __GCONV_NODB) |
6973fc01 UD |
82 | __set_errno (EINVAL); |
83 | ||
dec9ed9e | 84 | cd = (iconv_t) -1; |
6973fc01 UD |
85 | } |
86 | ||
87 | return (iconv_t) cd; | |
88 | } |