dcngettext.c raw
1 #include <libintl.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <errno.h>
5 #include <limits.h>
6 #include <sys/stat.h>
7 #include <sys/mman.h>
8 #include <ctype.h>
9 #include "locale_impl.h"
10 #include "atomic.h"
11 #include "pleval.h"
12 #include "lock.h"
13 #include "fork_impl.h"
14
15 #define malloc __libc_malloc
16 #define calloc __libc_calloc
17 #define realloc undef
18 #define free undef
19
20 struct binding {
21 struct binding *next;
22 int dirlen;
23 volatile int active;
24 char *domainname;
25 char *dirname;
26 char buf[];
27 };
28
29 static void *volatile bindings;
30
31 static char *gettextdir(const char *domainname, size_t *dirlen)
32 {
33 struct binding *p;
34 for (p=bindings; p; p=p->next) {
35 if (!strcmp(p->domainname, domainname) && p->active) {
36 *dirlen = p->dirlen;
37 return (char *)p->dirname;
38 }
39 }
40 return 0;
41 }
42
43 static volatile int lock[1];
44 volatile int *const __gettext_lockptr = lock;
45
46 char *bindtextdomain(const char *domainname, const char *dirname)
47 {
48 struct binding *p, *q;
49
50 if (!domainname) return 0;
51 if (!dirname) return gettextdir(domainname, &(size_t){0});
52
53 size_t domlen = strnlen(domainname, NAME_MAX+1);
54 size_t dirlen = strnlen(dirname, PATH_MAX);
55 if (domlen > NAME_MAX || dirlen >= PATH_MAX) {
56 errno = EINVAL;
57 return 0;
58 }
59
60 LOCK(lock);
61
62 for (p=bindings; p; p=p->next) {
63 if (!strcmp(p->domainname, domainname) &&
64 !strcmp(p->dirname, dirname)) {
65 break;
66 }
67 }
68
69 if (!p) {
70 p = calloc(sizeof *p + domlen + dirlen + 2, 1);
71 if (!p) {
72 UNLOCK(lock);
73 return 0;
74 }
75 p->next = bindings;
76 p->dirlen = dirlen;
77 p->domainname = p->buf;
78 p->dirname = p->buf + domlen + 1;
79 memcpy(p->domainname, domainname, domlen+1);
80 memcpy(p->dirname, dirname, dirlen+1);
81 a_cas_p(&bindings, bindings, p);
82 }
83
84 a_store(&p->active, 1);
85
86 for (q=bindings; q; q=q->next) {
87 if (!strcmp(q->domainname, domainname) && q != p)
88 a_store(&q->active, 0);
89 }
90
91 UNLOCK(lock);
92
93 return (char *)p->dirname;
94 }
95
96 static const char catnames[][12] = {
97 "LC_CTYPE",
98 "LC_NUMERIC",
99 "LC_TIME",
100 "LC_COLLATE",
101 "LC_MONETARY",
102 "LC_MESSAGES",
103 };
104
105 static const char catlens[] = { 8, 10, 7, 10, 11, 11 };
106
107 struct msgcat {
108 struct msgcat *next;
109 const void *map;
110 size_t map_size;
111 const char *plural_rule;
112 int nplurals;
113 struct binding *binding;
114 const struct __locale_map *lm;
115 int cat;
116 };
117
118 static char *dummy_gettextdomain()
119 {
120 return "messages";
121 }
122
123 weak_alias(dummy_gettextdomain, __gettextdomain);
124
125 char *dcngettext(const char *domainname, const char *msgid1, const char *msgid2, unsigned long int n, int category)
126 {
127 static struct msgcat *volatile cats;
128 struct msgcat *p;
129 struct __locale_struct *loc = CURRENT_LOCALE;
130 const struct __locale_map *lm;
131 size_t domlen;
132 struct binding *q;
133 int old_errno = errno;
134
135 /* match gnu gettext behaviour */
136 if (!msgid1) goto notrans;
137
138 if ((unsigned)category >= LC_ALL) goto notrans;
139
140 if (!domainname) domainname = __gettextdomain();
141
142 domlen = strnlen(domainname, NAME_MAX+1);
143 if (domlen > NAME_MAX) goto notrans;
144
145 for (q=bindings; q; q=q->next)
146 if (!strcmp(q->domainname, domainname) && q->active)
147 break;
148 if (!q) goto notrans;
149
150 lm = loc->cat[category];
151 if (!lm) {
152 notrans:
153 errno = old_errno;
154 return (char *) ((n == 1) ? msgid1 : msgid2);
155 }
156
157 for (p=cats; p; p=p->next)
158 if (p->binding == q && p->lm == lm && p->cat == category)
159 break;
160
161 if (!p) {
162 const char *dirname, *locname, *catname, *modname, *locp;
163 size_t dirlen, loclen, catlen, modlen, alt_modlen;
164 void *old_cats;
165 size_t map_size;
166
167 dirname = q->dirname;
168 locname = lm->name;
169 catname = catnames[category];
170
171 dirlen = q->dirlen;
172 loclen = strlen(locname);
173 catlen = catlens[category];
174
175 /* Logically split @mod suffix from locale name. */
176 modname = memchr(locname, '@', loclen);
177 if (!modname) modname = locname + loclen;
178 alt_modlen = modlen = loclen - (modname-locname);
179 loclen = modname-locname;
180
181 /* Drop .charset identifier; it is not used. */
182 const char *csp = memchr(locname, '.', loclen);
183 if (csp) loclen = csp-locname;
184
185 char name[dirlen+1 + loclen+modlen+1 + catlen+1 + domlen+3 + 1];
186 const void *map;
187
188 for (;;) {
189 snprintf(name, sizeof name, "%s/%.*s%.*s/%s/%s.mo\0",
190 dirname, (int)loclen, locname,
191 (int)alt_modlen, modname, catname, domainname);
192 if (map = __map_file(name, &map_size)) break;
193
194 /* Try dropping @mod, _YY, then both. */
195 if (alt_modlen) {
196 alt_modlen = 0;
197 } else if ((locp = memchr(locname, '_', loclen))) {
198 loclen = locp-locname;
199 alt_modlen = modlen;
200 } else {
201 break;
202 }
203 }
204 if (!map) goto notrans;
205
206 p = calloc(sizeof *p, 1);
207 if (!p) {
208 __munmap((void *)map, map_size);
209 goto notrans;
210 }
211 p->cat = category;
212 p->binding = q;
213 p->lm = lm;
214 p->map = map;
215 p->map_size = map_size;
216
217 const char *rule = "n!=1;";
218 unsigned long np = 2;
219 const char *r = __mo_lookup(p->map, p->map_size, "");
220 char *z;
221 while (r && strncmp(r, "Plural-Forms:", 13)) {
222 z = strchr(r, '\n');
223 r = z ? z+1 : 0;
224 }
225 if (r) {
226 r += 13;
227 while (isspace(*r)) r++;
228 if (!strncmp(r, "nplurals=", 9)) {
229 np = strtoul(r+9, &z, 10);
230 r = z;
231 }
232 while (*r && *r != ';') r++;
233 if (*r) {
234 r++;
235 while (isspace(*r)) r++;
236 if (!strncmp(r, "plural=", 7))
237 rule = r+7;
238 }
239 }
240 p->nplurals = np;
241 p->plural_rule = rule;
242
243 do {
244 old_cats = cats;
245 p->next = old_cats;
246 } while (a_cas_p(&cats, old_cats, p) != old_cats);
247 }
248
249 const char *trans = __mo_lookup(p->map, p->map_size, msgid1);
250 if (!trans) goto notrans;
251
252 /* Non-plural-processing gettext forms pass a null pointer as
253 * msgid2 to request that dcngettext suppress plural processing. */
254
255 if (msgid2 && p->nplurals) {
256 unsigned long plural = __pleval(p->plural_rule, n);
257 if (plural > p->nplurals) goto notrans;
258 while (plural--) {
259 size_t rem = p->map_size - (trans - (char *)p->map);
260 size_t l = strnlen(trans, rem);
261 if (l+1 >= rem)
262 goto notrans;
263 trans += l+1;
264 }
265 }
266 errno = old_errno;
267 return (char *)trans;
268 }
269
270 char *dcgettext(const char *domainname, const char *msgid, int category)
271 {
272 return dcngettext(domainname, msgid, 0, 1, category);
273 }
274
275 char *dngettext(const char *domainname, const char *msgid1, const char *msgid2, unsigned long int n)
276 {
277 return dcngettext(domainname, msgid1, msgid2, n, LC_MESSAGES);
278 }
279
280 char *dgettext(const char *domainname, const char *msgid)
281 {
282 return dcngettext(domainname, msgid, 0, 1, LC_MESSAGES);
283 }
284