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1 /* Implementation of the bindtextdomain(3) function
2 Copyright (C) 1995-1998, 2000, 2001 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 <autoconf.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 _nl_default_dirname__
49 # define _nl_domain_bindings _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
62 /* List with bindings of specific domains. */
63 extern struct binding *_nl_domain_bindings;
64
65 /* Lock variable to protect the global data in the gettext implementation. */
66 __libc_rwlock_define (extern, _nl_state_lock)
67
68
69 /* Names for the libintl functions are a problem. They must not clash
70 with existing names and they should follow ANSI C. But this source
71 code is also used in GNU C Library where the names have a __
72 prefix. So we have to make a difference here. */
73 #ifdef _LIBC
74 # define BINDTEXTDOMAIN __bindtextdomain
75 # define BIND_TEXTDOMAIN_CODESET __bind_textdomain_codeset
76 # ifndef strdup
77 # define strdup(str) __strdup (str)
78 # endif
79 #else
80 # define BINDTEXTDOMAIN bindtextdomain__
81 # define BIND_TEXTDOMAIN_CODESET bind_textdomain_codeset__
82 #endif
83
84 /* Prototypes for local functions. */
85 static void set_binding_values PARAMS ((const char *domainname,
86 const char **dirnamep,
87 const char **codesetp));
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 (domainname, dirnamep, codesetp)
97 const char *domainname;
98 const char **dirnamep;
99 const char **codesetp;
100 {
101 struct binding *binding;
102 int modified;
103
104 /* Some sanity checks. */
105 if (domainname == NULL || domainname[0] == '\0')
106 {
107 if (dirnamep)
108 *dirnamep = NULL;
109 if (codesetp)
110 *codesetp = NULL;
111 return;
112 }
113
114 __libc_rwlock_wrlock (_nl_state_lock);
115
116 modified = 0;
117
118 for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
119 {
120 int compare = strcmp (domainname, binding->domainname);
121 if (compare == 0)
122 /* We found it! */
123 break;
124 if (compare < 0)
125 {
126 /* It is not in the list. */
127 binding = NULL;
128 break;
129 }
130 }
131
132 if (binding != NULL)
133 {
134 if (dirnamep)
135 {
136 const char *dirname = *dirnamep;
137
138 if (dirname == NULL)
139 /* The current binding has be to returned. */
140 *dirnamep = binding->dirname;
141 else
142 {
143 /* The domain is already bound. If the new value and the old
144 one are equal we simply do nothing. Otherwise replace the
145 old binding. */
146 char *result = binding->dirname;
147 if (strcmp (dirname, result) != 0)
148 {
149 if (strcmp (dirname, _nl_default_dirname) == 0)
150 result = (char *) _nl_default_dirname;
151 else
152 {
153 #if defined _LIBC || defined HAVE_STRDUP
154 result = strdup (dirname);
155 #else
156 size_t len = strlen (dirname) + 1;
157 result = (char *) malloc (len);
158 if (__builtin_expect (result != NULL, 1))
159 memcpy (result, dirname, len);
160 #endif
161 }
162
163 if (__builtin_expect (result != NULL, 1))
164 {
165 if (binding->dirname != _nl_default_dirname)
166 free (binding->dirname);
167
168 binding->dirname = result;
169 modified = 1;
170 }
171 }
172 *dirnamep = result;
173 }
174 }
175
176 if (codesetp)
177 {
178 const char *codeset = *codesetp;
179
180 if (codeset == NULL)
181 /* The current binding has be to returned. */
182 *codesetp = binding->codeset;
183 else
184 {
185 /* The domain is already bound. If the new value and the old
186 one are equal we simply do nothing. Otherwise replace the
187 old binding. */
188 char *result = binding->codeset;
189 if (result == NULL || strcmp (codeset, result) != 0)
190 {
191 #if defined _LIBC || defined HAVE_STRDUP
192 result = strdup (codeset);
193 #else
194 size_t len = strlen (codeset) + 1;
195 result = (char *) malloc (len);
196 if (__builtin_expect (result != NULL, 1))
197 memcpy (result, codeset, len);
198 #endif
199
200 if (__builtin_expect (result != NULL, 1))
201 {
202 if (binding->codeset != NULL)
203 free (binding->codeset);
204
205 binding->codeset = result;
206 binding->codeset_cntr++;
207 modified = 1;
208 }
209 }
210 *codesetp = result;
211 }
212 }
213 }
214 else if ((dirnamep == NULL || *dirnamep == NULL)
215 && (codesetp == NULL || *codesetp == NULL))
216 {
217 /* Simply return the default values. */
218 if (dirnamep)
219 *dirnamep = _nl_default_dirname;
220 if (codesetp)
221 *codesetp = NULL;
222 }
223 else
224 {
225 /* We have to create a new binding. */
226 size_t len = strlen (domainname) + 1;
227 struct binding *new_binding =
228 (struct binding *) malloc (offsetof (struct binding, domainname) + len);
229
230 if (__builtin_expect (new_binding == NULL, 0))
231 goto failed;
232
233 memcpy (new_binding->domainname, domainname, len);
234
235 if (dirnamep)
236 {
237 const char *dirname = *dirnamep;
238
239 if (dirname == NULL)
240 /* The default value. */
241 dirname = _nl_default_dirname;
242 else
243 {
244 if (strcmp (dirname, _nl_default_dirname) == 0)
245 dirname = _nl_default_dirname;
246 else
247 {
248 char *result;
249 #if defined _LIBC || defined HAVE_STRDUP
250 result = strdup (dirname);
251 if (__builtin_expect (result == NULL, 0))
252 goto failed_dirname;
253 #else
254 size_t len = strlen (dirname) + 1;
255 result = (char *) malloc (len);
256 if (__builtin_expect (result == NULL, 0))
257 goto failed_dirname;
258 memcpy (result, dirname, len);
259 #endif
260 dirname = result;
261 }
262 }
263 *dirnamep = dirname;
264 new_binding->dirname = (char *) dirname;
265 }
266 else
267 /* The default value. */
268 new_binding->dirname = (char *) _nl_default_dirname;
269
270 new_binding->codeset_cntr = 0;
271
272 if (codesetp)
273 {
274 const char *codeset = *codesetp;
275
276 if (codeset != NULL)
277 {
278 char *result;
279
280 #if defined _LIBC || defined HAVE_STRDUP
281 result = strdup (codeset);
282 if (__builtin_expect (result == NULL, 0))
283 goto failed_codeset;
284 #else
285 size_t len = strlen (codeset) + 1;
286 result = (char *) malloc (len);
287 if (__builtin_expect (result == NULL, 0))
288 goto failed_codeset;
289 memcpy (result, codeset, len);
290 #endif
291 codeset = result;
292 new_binding->codeset_cntr++;
293 }
294 *codesetp = codeset;
295 new_binding->codeset = (char *) codeset;
296 }
297 else
298 new_binding->codeset = NULL;
299
300 /* Now enqueue it. */
301 if (_nl_domain_bindings == NULL
302 || strcmp (domainname, _nl_domain_bindings->domainname) < 0)
303 {
304 new_binding->next = _nl_domain_bindings;
305 _nl_domain_bindings = new_binding;
306 }
307 else
308 {
309 binding = _nl_domain_bindings;
310 while (binding->next != NULL
311 && strcmp (domainname, binding->next->domainname) > 0)
312 binding = binding->next;
313
314 new_binding->next = binding->next;
315 binding->next = new_binding;
316 }
317
318 modified = 1;
319
320 /* Here we deal with memory allocation failures. */
321 if (0)
322 {
323 failed_codeset:
324 if (new_binding->dirname != _nl_default_dirname)
325 free (new_binding->dirname);
326 failed_dirname:
327 free (new_binding);
328 failed:
329 if (dirnamep)
330 *dirnamep = NULL;
331 if (codesetp)
332 *codesetp = NULL;
333 }
334 }
335
336 /* If we modified any binding, we flush the caches. */
337 if (modified)
338 ++_nl_msg_cat_cntr;
339
340 __libc_rwlock_unlock (_nl_state_lock);
341 }
342
343 /* Specify that the DOMAINNAME message catalog will be found
344 in DIRNAME rather than in the system locale data base. */
345 char *
346 BINDTEXTDOMAIN (domainname, dirname)
347 const char *domainname;
348 const char *dirname;
349 {
350 set_binding_values (domainname, &dirname, NULL);
351 return (char *) dirname;
352 }
353
354 /* Specify the character encoding in which the messages from the
355 DOMAINNAME message catalog will be returned. */
356 char *
357 BIND_TEXTDOMAIN_CODESET (domainname, codeset)
358 const char *domainname;
359 const char *codeset;
360 {
361 set_binding_values (domainname, NULL, &codeset);
362 return (char *) codeset;
363 }
364
365 #ifdef _LIBC
366 /* Aliases for function names in GNU C Library. */
367 weak_alias (__bindtextdomain, bindtextdomain);
368 weak_alias (__bind_textdomain_codeset, bind_textdomain_codeset);
369 #endif