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24d56127 | 1 | /* Character set conversion. |
5e69ceb7 | 2 | Copyright (C) 2007, 2009-2014 Free Software Foundation, Inc. |
24d56127 LC |
3 | |
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU Lesser General Public License as published by | |
6 | the Free Software Foundation; either version 2, or (at your option) | |
7 | any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public License along | |
005de2e8 | 15 | with this program; if not, see <http://www.gnu.org/licenses/>. */ |
24d56127 LC |
16 | |
17 | #include <config.h> | |
18 | ||
19 | /* Specification. */ | |
20 | #include <iconv.h> | |
21 | ||
22 | #include <errno.h> | |
23 | #include <string.h> | |
24 | #include "c-ctype.h" | |
25 | #include "c-strcase.h" | |
26 | ||
27 | #define SIZEOF(a) (sizeof(a) / sizeof(a[0])) | |
28 | ||
29 | /* Namespace cleanliness. */ | |
30 | #define mapping_lookup rpl_iconv_open_mapping_lookup | |
31 | ||
32 | /* The macro ICONV_FLAVOR is defined to one of these or undefined. */ | |
33 | ||
34 | #define ICONV_FLAVOR_AIX "iconv_open-aix.h" | |
35 | #define ICONV_FLAVOR_HPUX "iconv_open-hpux.h" | |
36 | #define ICONV_FLAVOR_IRIX "iconv_open-irix.h" | |
37 | #define ICONV_FLAVOR_OSF "iconv_open-osf.h" | |
8912421c | 38 | #define ICONV_FLAVOR_SOLARIS "iconv_open-solaris.h" |
24d56127 LC |
39 | |
40 | #ifdef ICONV_FLAVOR | |
41 | # include ICONV_FLAVOR | |
42 | #endif | |
43 | ||
44 | iconv_t | |
45 | rpl_iconv_open (const char *tocode, const char *fromcode) | |
46 | #undef iconv_open | |
47 | { | |
48 | char fromcode_upper[32]; | |
49 | char tocode_upper[32]; | |
50 | char *fromcode_upper_end; | |
51 | char *tocode_upper_end; | |
52 | ||
53 | #if REPLACE_ICONV_UTF | |
54 | /* Special handling of conversion between UTF-8 and UTF-{16,32}{BE,LE}. | |
55 | Do this here, before calling the real iconv_open(), because OSF/1 5.1 | |
56 | iconv() to these encoding inserts a BOM, which is wrong. | |
57 | We do not need to handle conversion between arbitrary encodings and | |
58 | UTF-{16,32}{BE,LE}, because the 'striconveh' module implements two-step | |
005de2e8 | 59 | conversion through UTF-8. |
24d56127 LC |
60 | The _ICONV_* constants are chosen to be disjoint from any iconv_t |
61 | returned by the system's iconv_open() functions. Recall that iconv_t | |
62 | is a scalar type. */ | |
63 | if (c_toupper (fromcode[0]) == 'U' | |
64 | && c_toupper (fromcode[1]) == 'T' | |
65 | && c_toupper (fromcode[2]) == 'F' | |
66 | && fromcode[3] == '-') | |
67 | { | |
68 | if (c_toupper (tocode[0]) == 'U' | |
1cd4fffc LC |
69 | && c_toupper (tocode[1]) == 'T' |
70 | && c_toupper (tocode[2]) == 'F' | |
71 | && tocode[3] == '-') | |
72 | { | |
73 | if (strcmp (fromcode + 4, "8") == 0) | |
74 | { | |
75 | if (c_strcasecmp (tocode + 4, "16BE") == 0) | |
76 | return _ICONV_UTF8_UTF16BE; | |
77 | if (c_strcasecmp (tocode + 4, "16LE") == 0) | |
78 | return _ICONV_UTF8_UTF16LE; | |
79 | if (c_strcasecmp (tocode + 4, "32BE") == 0) | |
80 | return _ICONV_UTF8_UTF32BE; | |
81 | if (c_strcasecmp (tocode + 4, "32LE") == 0) | |
82 | return _ICONV_UTF8_UTF32LE; | |
83 | } | |
84 | else if (strcmp (tocode + 4, "8") == 0) | |
85 | { | |
86 | if (c_strcasecmp (fromcode + 4, "16BE") == 0) | |
87 | return _ICONV_UTF16BE_UTF8; | |
88 | if (c_strcasecmp (fromcode + 4, "16LE") == 0) | |
89 | return _ICONV_UTF16LE_UTF8; | |
90 | if (c_strcasecmp (fromcode + 4, "32BE") == 0) | |
91 | return _ICONV_UTF32BE_UTF8; | |
92 | if (c_strcasecmp (fromcode + 4, "32LE") == 0) | |
93 | return _ICONV_UTF32LE_UTF8; | |
94 | } | |
95 | } | |
24d56127 LC |
96 | } |
97 | #endif | |
98 | ||
99 | /* Do *not* add special support for 8-bit encodings like ASCII or ISO-8859-1 | |
100 | here. This would lead to programs that work in some locales (such as the | |
101 | "C" or "en_US" locales) but do not work in East Asian locales. It is | |
102 | better if programmers make their programs depend on GNU libiconv (except | |
103 | on glibc systems), e.g. by using the AM_ICONV macro and documenting the | |
104 | dependency in an INSTALL or DEPENDENCIES file. */ | |
105 | ||
106 | /* Try with the original names first. | |
107 | This covers the case when fromcode or tocode is a lowercase encoding name | |
108 | that is understood by the system's iconv_open but not listed in our | |
109 | mappings table. */ | |
110 | { | |
111 | iconv_t cd = iconv_open (tocode, fromcode); | |
112 | if (cd != (iconv_t)(-1)) | |
113 | return cd; | |
114 | } | |
115 | ||
116 | /* Convert the encodings to upper case, because | |
117 | 1. in the arguments of iconv_open() on AIX, HP-UX, and OSF/1 the case | |
1cd4fffc | 118 | matters, |
24d56127 LC |
119 | 2. it makes searching in the table faster. */ |
120 | { | |
121 | const char *p = fromcode; | |
122 | char *q = fromcode_upper; | |
123 | while ((*q = c_toupper (*p)) != '\0') | |
124 | { | |
1cd4fffc LC |
125 | p++; |
126 | q++; | |
127 | if (q == &fromcode_upper[SIZEOF (fromcode_upper)]) | |
128 | { | |
129 | errno = EINVAL; | |
130 | return (iconv_t)(-1); | |
131 | } | |
24d56127 LC |
132 | } |
133 | fromcode_upper_end = q; | |
134 | } | |
135 | ||
136 | { | |
137 | const char *p = tocode; | |
138 | char *q = tocode_upper; | |
139 | while ((*q = c_toupper (*p)) != '\0') | |
140 | { | |
1cd4fffc LC |
141 | p++; |
142 | q++; | |
143 | if (q == &tocode_upper[SIZEOF (tocode_upper)]) | |
144 | { | |
145 | errno = EINVAL; | |
146 | return (iconv_t)(-1); | |
147 | } | |
24d56127 LC |
148 | } |
149 | tocode_upper_end = q; | |
150 | } | |
151 | ||
152 | #ifdef ICONV_FLAVOR | |
153 | /* Apply the mappings. */ | |
154 | { | |
155 | const struct mapping *m = | |
156 | mapping_lookup (fromcode_upper, fromcode_upper_end - fromcode_upper); | |
157 | ||
158 | fromcode = (m != NULL ? m->vendor_name : fromcode_upper); | |
159 | } | |
160 | { | |
161 | const struct mapping *m = | |
162 | mapping_lookup (tocode_upper, tocode_upper_end - tocode_upper); | |
163 | ||
164 | tocode = (m != NULL ? m->vendor_name : tocode_upper); | |
165 | } | |
166 | #else | |
167 | fromcode = fromcode_upper; | |
168 | tocode = tocode_upper; | |
169 | #endif | |
170 | ||
171 | return iconv_open (tocode, fromcode); | |
172 | } |