1 | /* Find matching transformation algorithms and initialize steps. |
2 | Copyright (C) 1997-2017 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <errno.h> |
21 | #include <locale.h> |
22 | #include "../locale/localeinfo.h" |
23 | #include <stdlib.h> |
24 | #include <string.h> |
25 | |
26 | #include <gconv_int.h> |
27 | |
28 | |
29 | int |
30 | internal_function |
31 | __gconv_open (const char *toset, const char *fromset, __gconv_t *handle, |
32 | int flags) |
33 | { |
34 | struct __gconv_step *steps; |
35 | size_t nsteps; |
36 | __gconv_t result = NULL; |
37 | size_t cnt = 0; |
38 | int res; |
39 | int conv_flags = 0; |
40 | const char *errhand; |
41 | const char *ignore; |
42 | bool translit = false; |
43 | |
44 | /* Find out whether any error handling method is specified. */ |
45 | errhand = strchr (toset, '/'); |
46 | if (errhand != NULL) |
47 | errhand = strchr (errhand + 1, '/'); |
48 | if (__glibc_likely (errhand != NULL)) |
49 | { |
50 | if (*++errhand == '\0') |
51 | errhand = NULL; |
52 | else |
53 | { |
54 | /* Make copy without the error handling description. */ |
55 | char *newtoset = (char *) alloca (errhand - toset + 1); |
56 | char *tok; |
57 | char *ptr = NULL /* Work around a bogus warning */; |
58 | |
59 | newtoset[errhand - toset] = '\0'; |
60 | toset = memcpy (newtoset, toset, errhand - toset); |
61 | |
62 | /* Find the appropriate transliteration handlers. */ |
63 | tok = strdupa (errhand); |
64 | |
65 | tok = __strtok_r (tok, "," , &ptr); |
66 | while (tok != NULL) |
67 | { |
68 | if (__strcasecmp_l (tok, "TRANSLIT" , _nl_C_locobj_ptr) == 0) |
69 | translit = true; |
70 | else if (__strcasecmp_l (tok, "IGNORE" , _nl_C_locobj_ptr) == 0) |
71 | /* Set the flag to ignore all errors. */ |
72 | conv_flags |= __GCONV_IGNORE_ERRORS; |
73 | |
74 | tok = __strtok_r (NULL, "," , &ptr); |
75 | } |
76 | } |
77 | } |
78 | |
79 | /* For the source character set we ignore the error handler specification. |
80 | XXX Is this really always the best? */ |
81 | ignore = strchr (fromset, '/'); |
82 | if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL |
83 | && *++ignore != '\0') |
84 | { |
85 | char *newfromset = (char *) alloca (ignore - fromset + 1); |
86 | |
87 | newfromset[ignore - fromset] = '\0'; |
88 | fromset = memcpy (newfromset, fromset, ignore - fromset); |
89 | } |
90 | |
91 | /* If the string is empty define this to mean the charset of the |
92 | currently selected locale. */ |
93 | if (strcmp (toset, "//" ) == 0) |
94 | { |
95 | const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET); |
96 | size_t len = strlen (codeset); |
97 | char *dest; |
98 | toset = dest = (char *) alloca (len + 3); |
99 | memcpy (__mempcpy (dest, codeset, len), "//" , 3); |
100 | } |
101 | if (strcmp (fromset, "//" ) == 0) |
102 | { |
103 | const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET); |
104 | size_t len = strlen (codeset); |
105 | char *dest; |
106 | fromset = dest = (char *) alloca (len + 3); |
107 | memcpy (__mempcpy (dest, codeset, len), "//" , 3); |
108 | } |
109 | |
110 | res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags); |
111 | if (res == __GCONV_OK) |
112 | { |
113 | /* Allocate room for handle. */ |
114 | result = (__gconv_t) malloc (sizeof (struct __gconv_info) |
115 | + (nsteps |
116 | * sizeof (struct __gconv_step_data))); |
117 | if (result == NULL) |
118 | res = __GCONV_NOMEM; |
119 | else |
120 | { |
121 | /* Remember the list of steps. */ |
122 | result->__steps = steps; |
123 | result->__nsteps = nsteps; |
124 | |
125 | /* Clear the array for the step data. */ |
126 | memset (result->__data, '\0', |
127 | nsteps * sizeof (struct __gconv_step_data)); |
128 | |
129 | /* Call all initialization functions for the transformation |
130 | step implementations. */ |
131 | for (cnt = 0; cnt < nsteps; ++cnt) |
132 | { |
133 | size_t size; |
134 | |
135 | /* Would have to be done if we would not clear the whole |
136 | array above. */ |
137 | #if 0 |
138 | /* Reset the counter. */ |
139 | result->__data[cnt].__invocation_counter = 0; |
140 | |
141 | /* It's a regular use. */ |
142 | result->__data[cnt].__internal_use = 0; |
143 | #endif |
144 | |
145 | /* We use the `mbstate_t' member in DATA. */ |
146 | result->__data[cnt].__statep = &result->__data[cnt].__state; |
147 | |
148 | /* The builtin transliteration handling only |
149 | supports the internal encoding. */ |
150 | if (translit |
151 | && __strcasecmp_l (steps[cnt].__from_name, |
152 | "INTERNAL" , _nl_C_locobj_ptr) == 0) |
153 | conv_flags |= __GCONV_TRANSLIT; |
154 | |
155 | /* If this is the last step we must not allocate an |
156 | output buffer. */ |
157 | if (cnt < nsteps - 1) |
158 | { |
159 | result->__data[cnt].__flags = conv_flags; |
160 | |
161 | /* Allocate the buffer. */ |
162 | size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to); |
163 | |
164 | result->__data[cnt].__outbuf = malloc (size); |
165 | if (result->__data[cnt].__outbuf == NULL) |
166 | { |
167 | res = __GCONV_NOMEM; |
168 | goto bail; |
169 | } |
170 | |
171 | result->__data[cnt].__outbufend = |
172 | result->__data[cnt].__outbuf + size; |
173 | } |
174 | else |
175 | { |
176 | /* Handle the last entry. */ |
177 | result->__data[cnt].__flags = conv_flags | __GCONV_IS_LAST; |
178 | |
179 | break; |
180 | } |
181 | } |
182 | } |
183 | |
184 | if (res != __GCONV_OK) |
185 | { |
186 | /* Something went wrong. Free all the resources. */ |
187 | int serrno; |
188 | bail: |
189 | serrno = errno; |
190 | |
191 | if (result != NULL) |
192 | { |
193 | while (cnt-- > 0) |
194 | free (result->__data[cnt].__outbuf); |
195 | |
196 | free (result); |
197 | result = NULL; |
198 | } |
199 | |
200 | __gconv_close_transform (steps, nsteps); |
201 | |
202 | __set_errno (serrno); |
203 | } |
204 | } |
205 | |
206 | *handle = result; |
207 | return res; |
208 | } |
209 | |