| 1 | /* Character set conversion.
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| 2 | Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | #include <config.h>
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| 18 |
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| 19 | /* Specification. */
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| 20 | #include <iconv.h>
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| 21 |
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| 22 | #include <errno.h>
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| 23 | #include <string.h>
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| 24 | #include "c-ctype.h"
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| 25 | #include "c-strcase.h"
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| 26 |
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| 27 | #define SIZEOF(a) (sizeof(a) / sizeof(a[0]))
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| 28 |
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| 29 | /* Namespace cleanliness. */
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| 30 | #define mapping_lookup rpl_iconv_open_mapping_lookup
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| 31 |
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| 32 | /* The macro ICONV_FLAVOR is defined to one of these or undefined. */
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| 33 |
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| 34 | #define ICONV_FLAVOR_AIX "iconv_open-aix.h"
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| 35 | #define ICONV_FLAVOR_HPUX "iconv_open-hpux.h"
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| 36 | #define ICONV_FLAVOR_IRIX "iconv_open-irix.h"
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| 37 | #define ICONV_FLAVOR_OSF "iconv_open-osf.h"
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| 38 | #define ICONV_FLAVOR_SOLARIS "iconv_open-solaris.h"
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| 39 | #define ICONV_FLAVOR_ZOS "iconv_open-zos.h"
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| 40 |
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| 41 | #ifdef ICONV_FLAVOR
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| 42 | # include ICONV_FLAVOR
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| 43 | #endif
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| 44 |
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| 45 | iconv_t
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| 46 | rpl_iconv_open (const char *tocode, const char *fromcode)
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| 47 | #undef iconv_open
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| 48 | {
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| 49 | char fromcode_upper[32];
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| 50 | char tocode_upper[32];
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| 51 | char *fromcode_upper_end;
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| 52 | char *tocode_upper_end;
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| 53 |
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| 54 | #if REPLACE_ICONV_UTF
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| 55 | /* Special handling of conversion between UTF-8 and UTF-{16,32}{BE,LE}.
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| 56 | Do this here, before calling the real iconv_open(), because OSF/1 5.1
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| 57 | iconv() to these encoding inserts a BOM, which is wrong.
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| 58 | We do not need to handle conversion between arbitrary encodings and
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| 59 | UTF-{16,32}{BE,LE}, because the 'striconveh' module implements two-step
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| 60 | conversion through UTF-8.
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| 61 | The _ICONV_* constants are chosen to be disjoint from any iconv_t
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| 62 | returned by the system's iconv_open() functions. Recall that iconv_t
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| 63 | is a scalar type. */
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| 64 | if (c_toupper (fromcode[0]) == 'U'
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| 65 | && c_toupper (fromcode[1]) == 'T'
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| 66 | && c_toupper (fromcode[2]) == 'F'
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| 67 | && fromcode[3] == '-')
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| 68 | {
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| 69 | if (c_toupper (tocode[0]) == 'U'
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| 70 | && c_toupper (tocode[1]) == 'T'
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| 71 | && c_toupper (tocode[2]) == 'F'
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| 72 | && tocode[3] == '-')
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| 73 | {
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| 74 | if (strcmp (fromcode + 4, "8") == 0)
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| 75 | {
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| 76 | if (c_strcasecmp (tocode + 4, "16BE") == 0)
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| 77 | return _ICONV_UTF8_UTF16BE;
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| 78 | if (c_strcasecmp (tocode + 4, "16LE") == 0)
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| 79 | return _ICONV_UTF8_UTF16LE;
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| 80 | if (c_strcasecmp (tocode + 4, "32BE") == 0)
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| 81 | return _ICONV_UTF8_UTF32BE;
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| 82 | if (c_strcasecmp (tocode + 4, "32LE") == 0)
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| 83 | return _ICONV_UTF8_UTF32LE;
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| 84 | }
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| 85 | else if (strcmp (tocode + 4, "8") == 0)
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| 86 | {
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| 87 | if (c_strcasecmp (fromcode + 4, "16BE") == 0)
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| 88 | return _ICONV_UTF16BE_UTF8;
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| 89 | if (c_strcasecmp (fromcode + 4, "16LE") == 0)
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| 90 | return _ICONV_UTF16LE_UTF8;
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| 91 | if (c_strcasecmp (fromcode + 4, "32BE") == 0)
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| 92 | return _ICONV_UTF32BE_UTF8;
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| 93 | if (c_strcasecmp (fromcode + 4, "32LE") == 0)
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| 94 | return _ICONV_UTF32LE_UTF8;
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| 95 | }
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| 96 | }
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| 97 | }
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| 98 | #endif
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| 99 |
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| 100 | /* Do *not* add special support for 8-bit encodings like ASCII or ISO-8859-1
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| 101 | here. This would lead to programs that work in some locales (such as the
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| 102 | "C" or "en_US" locales) but do not work in East Asian locales. It is
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| 103 | better if programmers make their programs depend on GNU libiconv (except
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| 104 | on glibc systems), e.g. by using the AM_ICONV macro and documenting the
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| 105 | dependency in an INSTALL or DEPENDENCIES file. */
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| 106 |
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| 107 | /* Try with the original names first.
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| 108 | This covers the case when fromcode or tocode is a lowercase encoding name
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| 109 | that is understood by the system's iconv_open but not listed in our
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| 110 | mappings table. */
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| 111 | {
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| 112 | iconv_t cd = iconv_open (tocode, fromcode);
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| 113 | if (cd != (iconv_t)(-1))
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| 114 | return cd;
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| 115 | }
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| 116 |
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| 117 | /* Convert the encodings to upper case, because
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| 118 | 1. in the arguments of iconv_open() on AIX, HP-UX, and OSF/1 the case
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| 119 | matters,
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| 120 | 2. it makes searching in the table faster. */
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| 121 | {
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| 122 | const char *p = fromcode;
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| 123 | char *q = fromcode_upper;
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| 124 | while ((*q = c_toupper (*p)) != '\0')
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| 125 | {
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| 126 | p++;
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| 127 | q++;
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| 128 | if (q == &fromcode_upper[SIZEOF (fromcode_upper)])
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| 129 | {
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| 130 | errno = EINVAL;
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| 131 | return (iconv_t)(-1);
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| 132 | }
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| 133 | }
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| 134 | fromcode_upper_end = q;
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| 135 | }
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| 136 |
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| 137 | {
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| 138 | const char *p = tocode;
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| 139 | char *q = tocode_upper;
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| 140 | while ((*q = c_toupper (*p)) != '\0')
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| 141 | {
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| 142 | p++;
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| 143 | q++;
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| 144 | if (q == &tocode_upper[SIZEOF (tocode_upper)])
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| 145 | {
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| 146 | errno = EINVAL;
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| 147 | return (iconv_t)(-1);
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| 148 | }
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| 149 | }
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| 150 | tocode_upper_end = q;
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| 151 | }
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| 152 |
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| 153 | #ifdef ICONV_FLAVOR
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| 154 | /* Apply the mappings. */
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| 155 | {
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| 156 | const struct mapping *m =
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| 157 | mapping_lookup (fromcode_upper, fromcode_upper_end - fromcode_upper);
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| 158 |
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| 159 | fromcode = (m != NULL ? m->vendor_name : fromcode_upper);
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| 160 | }
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| 161 | {
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| 162 | const struct mapping *m =
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| 163 | mapping_lookup (tocode_upper, tocode_upper_end - tocode_upper);
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| 164 |
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| 165 | tocode = (m != NULL ? m->vendor_name : tocode_upper);
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| 166 | }
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| 167 | #else
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| 168 | fromcode = fromcode_upper;
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| 169 | tocode = tocode_upper;
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| 170 | #endif
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| 171 |
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| 172 | return iconv_open (tocode, fromcode);
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| 173 | }
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