[444] | 1 | /* |
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| 2 | * Copyright (c) 2003-2004, Artem B. Bityuckiy |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 23 | * SUCH DAMAGE. |
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| 24 | */ |
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| 25 | #include <_ansi.h> |
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| 26 | #include <reent.h> |
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| 27 | #include <newlib.h> |
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| 28 | #include <sys/types.h> |
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| 29 | #include <string.h> |
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| 30 | #include <stdlib.h> |
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| 31 | #include <errno.h> |
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| 32 | #include <ctype.h> |
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| 33 | #include <sys/iconvnls.h> |
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| 34 | #include "local.h" |
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| 35 | |
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| 36 | /* |
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| 37 | * canonical_form - canonize 'str'. |
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| 38 | * |
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| 39 | * PARAMETERS: |
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| 40 | * struct _reent *rptr - reent structure of current thread/process. |
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| 41 | * const char *str - string to canonize. |
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| 42 | * |
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| 43 | * DESCRIPTION: |
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| 44 | * Converts all letters to small and substitute all '-' characters by '_' |
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| 45 | * characters. |
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| 46 | * |
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| 47 | * RETURN: |
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| 48 | * Returns canonical form of 'str' if success, NULL if failure. |
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| 49 | */ |
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| 50 | static const char * |
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| 51 | canonical_form (struct _reent *rptr, |
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| 52 | const char *str) |
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| 53 | { |
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| 54 | char *p, *p1; |
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| 55 | |
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| 56 | if (str == NULL || (p = p1 = _strdup_r (rptr, str)) == NULL) |
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| 57 | return (const char *)NULL; |
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| 58 | |
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| 59 | for (; *str; str++, p++) |
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| 60 | { |
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| 61 | if (*str == '-') |
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| 62 | *p = '_'; |
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| 63 | else |
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| 64 | *p = tolower (*str); |
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| 65 | } |
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| 66 | |
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| 67 | return (const char *)p1; |
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| 68 | } |
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| 69 | |
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| 70 | /* |
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| 71 | * find_alias - find encoding name name by it's alias. |
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| 72 | * |
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| 73 | * PARAMETERS: |
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| 74 | * struct _reent *rptr - reent structure of current thread/process. |
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| 75 | * const char *alias - alias by which "official" name should be found. |
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| 76 | * const char *table - aliases table. |
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| 77 | * int len - aliases table length. |
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| 78 | * |
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| 79 | * DESCRIPTION: |
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| 80 | * 'table' contains the list of encoding names and aliases. |
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| 81 | * Names go first, e.g.: |
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| 82 | * |
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| 83 | * name1 alias11 alias12 alias1N |
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| 84 | * name2 alias21 alias22 alias2N |
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| 85 | * nameM aliasM1 aliasM2 aliasMN |
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| 86 | * |
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| 87 | * If line begins with backspace it is considered as the continuation of |
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| 88 | * previous line. |
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| 89 | * |
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| 90 | * RETURN: |
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| 91 | * Returns pointer to name found if success. In case of error returns NULL |
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| 92 | * and sets current thread's/process's errno. |
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| 93 | */ |
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| 94 | static char * |
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| 95 | find_alias (struct _reent *rptr, |
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| 96 | const char *alias, |
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| 97 | const char *table, |
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| 98 | int len) |
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| 99 | { |
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| 100 | const char *end; |
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| 101 | const char *p; |
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| 102 | int l = strlen (alias); |
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| 103 | const char *ptable = table; |
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| 104 | const char *table_end = table + len; |
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| 105 | |
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| 106 | if (table == NULL || alias == NULL || *table == '\0' || *alias == '\0') |
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| 107 | return NULL; |
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| 108 | |
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| 109 | search_again: |
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| 110 | if (len < l || (p = strnstr (ptable, alias, len)) == NULL) |
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| 111 | return NULL; |
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| 112 | |
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| 113 | /* Check that substring is segregated by '\n', '\t' or ' ' */ |
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| 114 | if (!((p == table || isspace (*(p-1)) || *(p-1) == '\n') |
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| 115 | && (p+l == table_end || isspace (*(p+l)) || *(p+l) == '\n'))) |
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| 116 | { |
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| 117 | ptable = p + l; |
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| 118 | len -= table - p; |
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| 119 | goto search_again; |
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| 120 | } |
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| 121 | |
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| 122 | while(--p > table && *p != '\n'); |
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| 123 | |
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| 124 | if (*(++p) == '#') |
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| 125 | return NULL; |
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| 126 | |
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| 127 | for (end = p + 1; !isspace (*end) && *end != '\n' && *end != '\0'; end++); |
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| 128 | |
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| 129 | return _strndup_r (rptr, p, (size_t)(end - p)); |
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| 130 | } |
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| 131 | |
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| 132 | /* |
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| 133 | * _iconv_resolve_encoding_name - resolves encoding's name by given alias. |
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| 134 | * |
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| 135 | * PARAMETERS: |
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| 136 | * struct _reent *rptr - reent structure of current thread/process. |
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| 137 | * const char *ca - encoding alias to resolve. |
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| 138 | * |
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| 139 | * DESCRIPTION: |
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| 140 | * First, tries to find 'ca' among built-in aliases. If not found, tries to |
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| 141 | * find it external file. |
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| 142 | * |
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| 143 | * RETURN: |
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| 144 | * Encoding name if found. In case of error returns NULL |
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| 145 | * and sets current thread's/process's errno. |
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| 146 | */ |
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| 147 | char * |
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| 148 | _iconv_resolve_encoding_name (struct _reent *rptr, |
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| 149 | const char *ca) |
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| 150 | { |
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| 151 | char *p = (char *)ca; |
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| 152 | |
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| 153 | /* Alias shouldn't contain white spaces, '\n' and '\r' symbols */ |
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| 154 | while (*p) |
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| 155 | if (*p == ' ' || *p == '\r' || *p++ == '\n') |
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| 156 | return NULL; |
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| 157 | |
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| 158 | if ((ca = canonical_form (rptr, ca)) == NULL) |
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| 159 | return NULL; |
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| 160 | |
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| 161 | p = find_alias (rptr, ca, _iconv_aliases, strlen (_iconv_aliases)); |
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| 162 | |
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| 163 | _free_r (rptr, (void *)ca); |
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| 164 | return p; |
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| 165 | } |
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| 166 | |
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