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