| 1 | /* Character set conversion. |
| 2 | Copyright (C) 2007 Free Software Foundation, Inc. |
| 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 |
| 15 | with this program; if not, write to the Free Software Foundation, |
| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 17 | |
| 18 | #include <config.h> |
| 19 | |
| 20 | /* Specification. */ |
| 21 | #include <iconv.h> |
| 22 | |
| 23 | #include <errno.h> |
| 24 | #include <string.h> |
| 25 | #include "c-ctype.h" |
| 26 | #include "c-strcase.h" |
| 27 | |
| 28 | #define SIZEOF(a) (sizeof(a) / sizeof(a[0])) |
| 29 | |
| 30 | /* Namespace cleanliness. */ |
| 31 | #define mapping_lookup rpl_iconv_open_mapping_lookup |
| 32 | |
| 33 | /* The macro ICONV_FLAVOR is defined to one of these or undefined. */ |
| 34 | |
| 35 | #define ICONV_FLAVOR_AIX "iconv_open-aix.h" |
| 36 | #define ICONV_FLAVOR_HPUX "iconv_open-hpux.h" |
| 37 | #define ICONV_FLAVOR_IRIX "iconv_open-irix.h" |
| 38 | #define ICONV_FLAVOR_OSF "iconv_open-osf.h" |
| 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 |
| 59 | conversion throough UTF-8. |
| 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' |
| 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 | } |
| 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 |
| 118 | matters, |
| 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 | { |
| 125 | p++; |
| 126 | q++; |
| 127 | if (q == &fromcode_upper[SIZEOF (fromcode_upper)]) |
| 128 | { |
| 129 | errno = EINVAL; |
| 130 | return (iconv_t)(-1); |
| 131 | } |
| 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 | { |
| 141 | p++; |
| 142 | q++; |
| 143 | if (q == &tocode_upper[SIZEOF (tocode_upper)]) |
| 144 | { |
| 145 | errno = EINVAL; |
| 146 | return (iconv_t)(-1); |
| 147 | } |
| 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 | } |