1 /* Implementation of the bindtextdomain(3) function
2 Copyright (C) 1995-1998, 2000-2003 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Library General Public License as published
6 by 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 GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public
15 License along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 USA. */
18
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 #include <stddef.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #ifdef _LIBC
28 # include <libintl.h>
29 #else
30 # include "libgnuintl.h"
31 #endif
32 #include "gettextP.h"
33
34 #ifdef _LIBC
35 /* We have to handle multi-threaded applications. */
36 # include <bits/libc-lock.h>
37 #else
38 /* Provide dummy implementation if this is outside glibc. */
39 # define __libc_rwlock_define(CLASS, NAME)
40 # define __libc_rwlock_wrlock(NAME)
41 # define __libc_rwlock_unlock(NAME)
42 #endif
43
44 /* The internal variables in the standalone libintl.a must have different
45 names than the internal variables in GNU libc, otherwise programs
46 using libintl.a cannot be linked statically. */
47 #if !defined _LIBC
48 # define _nl_default_dirname libintl_nl_default_dirname
49 # define _nl_domain_bindings libintl_nl_domain_bindings
50 #endif
51
52 /* Some compilers, like SunOS4 cc, don't have offsetof in <stddef.h>. */
53 #ifndef offsetof
54 # define offsetof(type,ident) ((size_t)&(((type*)0)->ident))
55 #endif
56
57 /* @@ end of prolog @@ */
58
59 /* Contains the default location of the message catalogs. */
60 extern const char _nl_default_dirname[];
61 #ifdef _LIBC
62 extern const char _nl_default_dirname_internal[] attribute_hidden;
63 #else
64 # define INTUSE(name) name
65 #endif
66
67 /* List with bindings of specific domains. */
68 extern struct binding *_nl_domain_bindings;
69
70 /* Lock variable to protect the global data in the gettext implementation. */
__libc_rwlock_define(extern,_nl_state_lock attribute_hidden)71 __libc_rwlock_define (extern, _nl_state_lock attribute_hidden)
72
73
74 /* Names for the libintl functions are a problem. They must not clash
75 with existing names and they should follow ANSI C. But this source
76 code is also used in GNU C Library where the names have a __
77 prefix. So we have to make a difference here. */
78 #ifdef _LIBC
79 # define BINDTEXTDOMAIN __bindtextdomain
80 # define BIND_TEXTDOMAIN_CODESET __bind_textdomain_codeset
81 # ifndef strdup
82 # define strdup(str) __strdup (str)
83 # endif
84 #else
85 # define BINDTEXTDOMAIN libintl_bindtextdomain
86 # define BIND_TEXTDOMAIN_CODESET libintl_bind_textdomain_codeset
87 #endif
88
89 /* Specifies the directory name *DIRNAMEP and the output codeset *CODESETP
90 to be used for the DOMAINNAME message catalog.
91 If *DIRNAMEP or *CODESETP is NULL, the corresponding attribute is not
92 modified, only the current value is returned.
93 If DIRNAMEP or CODESETP is NULL, the corresponding attribute is neither
94 modified nor returned. */
95 static void
96 set_binding_values (const char *domainname,
97 const char **dirnamep, const char **codesetp)
98 {
99 struct binding *binding;
100 int modified;
101
102 /* Some sanity checks. */
103 if (domainname == NULL || domainname[0] == '\0')
104 {
105 if (dirnamep)
106 *dirnamep = NULL;
107 if (codesetp)
108 *codesetp = NULL;
109 return;
110 }
111
112 __libc_rwlock_wrlock (_nl_state_lock);
113
114 modified = 0;
115
116 for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
117 {
118 int compare = strcmp (domainname, binding->domainname);
119 if (compare == 0)
120 /* We found it! */
121 break;
122 if (compare < 0)
123 {
124 /* It is not in the list. */
125 binding = NULL;
126 break;
127 }
128 }
129
130 if (binding != NULL)
131 {
132 if (dirnamep)
133 {
134 const char *dirname = *dirnamep;
135
136 if (dirname == NULL)
137 /* The current binding has be to returned. */
138 *dirnamep = binding->dirname;
139 else
140 {
141 /* The domain is already bound. If the new value and the old
142 one are equal we simply do nothing. Otherwise replace the
143 old binding. */
144 char *result = binding->dirname;
145 if (strcmp (dirname, result) != 0)
146 {
147 if (strcmp (dirname, INTUSE(_nl_default_dirname)) == 0)
148 result = (char *) INTUSE(_nl_default_dirname);
149 else
150 {
151 #if defined _LIBC || defined HAVE_STRDUP
152 result = strdup (dirname);
153 #else
154 size_t len = strlen (dirname) + 1;
155 result = (char *) malloc (len);
156 if (__builtin_expect (result != NULL, 1))
157 memcpy (result, dirname, len);
158 #endif
159 }
160
161 if (__builtin_expect (result != NULL, 1))
162 {
163 if (binding->dirname != INTUSE(_nl_default_dirname))
164 free (binding->dirname);
165
166 binding->dirname = result;
167 modified = 1;
168 }
169 }
170 *dirnamep = result;
171 }
172 }
173
174 if (codesetp)
175 {
176 const char *codeset = *codesetp;
177
178 if (codeset == NULL)
179 /* The current binding has be to returned. */
180 *codesetp = binding->codeset;
181 else
182 {
183 /* The domain is already bound. If the new value and the old
184 one are equal we simply do nothing. Otherwise replace the
185 old binding. */
186 char *result = binding->codeset;
187 if (result == NULL || strcmp (codeset, result) != 0)
188 {
189 #if defined _LIBC || defined HAVE_STRDUP
190 result = strdup (codeset);
191 #else
192 size_t len = strlen (codeset) + 1;
193 result = (char *) malloc (len);
194 if (__builtin_expect (result != NULL, 1))
195 memcpy (result, codeset, len);
196 #endif
197
198 if (__builtin_expect (result != NULL, 1))
199 {
200 free (binding->codeset);
201
202 binding->codeset = result;
203 binding->codeset_cntr++;
204 modified = 1;
205 }
206 }
207 *codesetp = result;
208 }
209 }
210 }
211 else if ((dirnamep == NULL || *dirnamep == NULL)
212 && (codesetp == NULL || *codesetp == NULL))
213 {
214 /* Simply return the default values. */
215 if (dirnamep)
216 *dirnamep = INTUSE(_nl_default_dirname);
217 if (codesetp)
218 *codesetp = NULL;
219 }
220 else
221 {
222 /* We have to create a new binding. */
223 size_t len = strlen (domainname) + 1;
224 struct binding *new_binding =
225 (struct binding *) malloc (offsetof (struct binding, domainname) + len);
226
227 if (__builtin_expect (new_binding == NULL, 0))
228 goto failed;
229
230 memcpy (new_binding->domainname, domainname, len);
231
232 if (dirnamep)
233 {
234 const char *dirname = *dirnamep;
235
236 if (dirname == NULL)
237 /* The default value. */
238 dirname = INTUSE(_nl_default_dirname);
239 else
240 {
241 if (strcmp (dirname, INTUSE(_nl_default_dirname)) == 0)
242 dirname = INTUSE(_nl_default_dirname);
243 else
244 {
245 char *result;
246 #if defined _LIBC || defined HAVE_STRDUP
247 result = strdup (dirname);
248 if (__builtin_expect (result == NULL, 0))
249 goto failed_dirname;
250 #else
251 size_t len = strlen (dirname) + 1;
252 result = (char *) malloc (len);
253 if (__builtin_expect (result == NULL, 0))
254 goto failed_dirname;
255 memcpy (result, dirname, len);
256 #endif
257 dirname = result;
258 }
259 }
260 *dirnamep = dirname;
261 new_binding->dirname = (char *) dirname;
262 }
263 else
264 /* The default value. */
265 new_binding->dirname = (char *) INTUSE(_nl_default_dirname);
266
267 new_binding->codeset_cntr = 0;
268
269 if (codesetp)
270 {
271 const char *codeset = *codesetp;
272
273 if (codeset != NULL)
274 {
275 char *result;
276
277 #if defined _LIBC || defined HAVE_STRDUP
278 result = strdup (codeset);
279 if (__builtin_expect (result == NULL, 0))
280 goto failed_codeset;
281 #else
282 size_t len = strlen (codeset) + 1;
283 result = (char *) malloc (len);
284 if (__builtin_expect (result == NULL, 0))
285 goto failed_codeset;
286 memcpy (result, codeset, len);
287 #endif
288 codeset = result;
289 new_binding->codeset_cntr++;
290 }
291 *codesetp = codeset;
292 new_binding->codeset = (char *) codeset;
293 }
294 else
295 new_binding->codeset = NULL;
296
297 /* Now enqueue it. */
298 if (_nl_domain_bindings == NULL
299 || strcmp (domainname, _nl_domain_bindings->domainname) < 0)
300 {
301 new_binding->next = _nl_domain_bindings;
302 _nl_domain_bindings = new_binding;
303 }
304 else
305 {
306 binding = _nl_domain_bindings;
307 while (binding->next != NULL
308 && strcmp (domainname, binding->next->domainname) > 0)
309 binding = binding->next;
310
311 new_binding->next = binding->next;
312 binding->next = new_binding;
313 }
314
315 modified = 1;
316
317 /* Here we deal with memory allocation failures. */
318 if (0)
319 {
320 failed_codeset:
321 if (new_binding->dirname != INTUSE(_nl_default_dirname))
322 free (new_binding->dirname);
323 failed_dirname:
324 free (new_binding);
325 failed:
326 if (dirnamep)
327 *dirnamep = NULL;
328 if (codesetp)
329 *codesetp = NULL;
330 }
331 }
332
333 /* If we modified any binding, we flush the caches. */
334 if (modified)
335 ++_nl_msg_cat_cntr;
336
337 __libc_rwlock_unlock (_nl_state_lock);
338 }
339
340 /* Specify that the DOMAINNAME message catalog will be found
341 in DIRNAME rather than in the system locale data base. */
342 char *
BINDTEXTDOMAIN(const char * domainname,const char * dirname)343 BINDTEXTDOMAIN (const char *domainname, const char *dirname)
344 {
345 set_binding_values (domainname, &dirname, NULL);
346 return (char *) dirname;
347 }
348
349 /* Specify the character encoding in which the messages from the
350 DOMAINNAME message catalog will be returned. */
351 char *
BIND_TEXTDOMAIN_CODESET(const char * domainname,const char * codeset)352 BIND_TEXTDOMAIN_CODESET (const char *domainname, const char *codeset)
353 {
354 set_binding_values (domainname, NULL, &codeset);
355 return (char *) codeset;
356 }
357
358 #ifdef _LIBC
359 /* Aliases for function names in GNU C Library. */
360 weak_alias (__bindtextdomain, bindtextdomain);
361 weak_alias (__bind_textdomain_codeset, bind_textdomain_codeset);
362 #endif
363