lift child restrictions after multi-threaded fork
[musl.git] / src / locale / dcngettext.c
blobd1e6c6d13af33d6f095a58ed583502214fa2bcad
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"
15 #define malloc __libc_malloc
16 #define calloc __libc_calloc
17 #define realloc undef
18 #define free undef
20 struct binding {
21 struct binding *next;
22 int dirlen;
23 volatile int active;
24 char *domainname;
25 char *dirname;
26 char buf[];
29 static void *volatile bindings;
31 static char *gettextdir(const char *domainname, size_t *dirlen)
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;
40 return 0;
43 static volatile int lock[1];
44 volatile int *const __gettext_lockptr = lock;
46 char *bindtextdomain(const char *domainname, const char *dirname)
48 struct binding *p, *q;
50 if (!domainname) return 0;
51 if (!dirname) return gettextdir(domainname, &(size_t){0});
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;
60 LOCK(lock);
62 for (p=bindings; p; p=p->next) {
63 if (!strcmp(p->domainname, domainname) &&
64 !strcmp(p->dirname, dirname)) {
65 break;
69 if (!p) {
70 p = calloc(sizeof *p + domlen + dirlen + 2, 1);
71 if (!p) {
72 UNLOCK(lock);
73 return 0;
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);
84 a_store(&p->active, 1);
86 for (q=bindings; q; q=q->next) {
87 if (!strcmp(q->domainname, domainname) && q != p)
88 a_store(&q->active, 0);
91 UNLOCK(lock);
93 return (char *)p->dirname;
96 static const char catnames[][12] = {
97 "LC_CTYPE",
98 "LC_NUMERIC",
99 "LC_TIME",
100 "LC_COLLATE",
101 "LC_MONETARY",
102 "LC_MESSAGES",
105 static const char catlens[] = { 8, 10, 7, 10, 11, 11 };
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;
118 static char *dummy_gettextdomain()
120 return "messages";
123 weak_alias(dummy_gettextdomain, __gettextdomain);
125 char *dcngettext(const char *domainname, const char *msgid1, const char *msgid2, unsigned long int n, int category)
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;
135 if ((unsigned)category >= LC_ALL) goto notrans;
137 if (!domainname) domainname = __gettextdomain();
139 domlen = strnlen(domainname, NAME_MAX+1);
140 if (domlen > NAME_MAX) goto notrans;
142 for (q=bindings; q; q=q->next)
143 if (!strcmp(q->domainname, domainname) && q->active)
144 break;
145 if (!q) goto notrans;
147 lm = loc->cat[category];
148 if (!lm) {
149 notrans:
150 errno = old_errno;
151 return (char *) ((n == 1) ? msgid1 : msgid2);
154 for (p=cats; p; p=p->next)
155 if (p->binding == q && p->lm == lm && p->cat == category)
156 break;
158 if (!p) {
159 const char *dirname, *locname, *catname, *modname, *locp;
160 size_t dirlen, loclen, catlen, modlen, alt_modlen;
161 void *old_cats;
162 size_t map_size;
164 dirname = q->dirname;
165 locname = lm->name;
166 catname = catnames[category];
168 dirlen = q->dirlen;
169 loclen = strlen(locname);
170 catlen = catlens[category];
172 /* Logically split @mod suffix from locale name. */
173 modname = memchr(locname, '@', loclen);
174 if (!modname) modname = locname + loclen;
175 alt_modlen = modlen = loclen - (modname-locname);
176 loclen = modname-locname;
178 /* Drop .charset identifier; it is not used. */
179 const char *csp = memchr(locname, '.', loclen);
180 if (csp) loclen = csp-locname;
182 char name[dirlen+1 + loclen+modlen+1 + catlen+1 + domlen+3 + 1];
183 const void *map;
185 for (;;) {
186 snprintf(name, sizeof name, "%s/%.*s%.*s/%s/%s.mo\0",
187 dirname, (int)loclen, locname,
188 (int)alt_modlen, modname, catname, domainname);
189 if (map = __map_file(name, &map_size)) break;
191 /* Try dropping @mod, _YY, then both. */
192 if (alt_modlen) {
193 alt_modlen = 0;
194 } else if ((locp = memchr(locname, '_', loclen))) {
195 loclen = locp-locname;
196 alt_modlen = modlen;
197 } else {
198 break;
201 if (!map) goto notrans;
203 p = calloc(sizeof *p, 1);
204 if (!p) {
205 __munmap((void *)map, map_size);
206 goto notrans;
208 p->cat = category;
209 p->binding = q;
210 p->lm = lm;
211 p->map = map;
212 p->map_size = map_size;
214 const char *rule = "n!=1;";
215 unsigned long np = 2;
216 const char *r = __mo_lookup(p->map, p->map_size, "");
217 char *z;
218 while (r && strncmp(r, "Plural-Forms:", 13)) {
219 z = strchr(r, '\n');
220 r = z ? z+1 : 0;
222 if (r) {
223 r += 13;
224 while (isspace(*r)) r++;
225 if (!strncmp(r, "nplurals=", 9)) {
226 np = strtoul(r+9, &z, 10);
227 r = z;
229 while (*r && *r != ';') r++;
230 if (*r) {
231 r++;
232 while (isspace(*r)) r++;
233 if (!strncmp(r, "plural=", 7))
234 rule = r+7;
237 p->nplurals = np;
238 p->plural_rule = rule;
240 do {
241 old_cats = cats;
242 p->next = old_cats;
243 } while (a_cas_p(&cats, old_cats, p) != old_cats);
246 const char *trans = __mo_lookup(p->map, p->map_size, msgid1);
247 if (!trans) goto notrans;
249 /* Non-plural-processing gettext forms pass a null pointer as
250 * msgid2 to request that dcngettext suppress plural processing. */
252 if (msgid2 && p->nplurals) {
253 unsigned long plural = __pleval(p->plural_rule, n);
254 if (plural > p->nplurals) goto notrans;
255 while (plural--) {
256 size_t rem = p->map_size - (trans - (char *)p->map);
257 size_t l = strnlen(trans, rem);
258 if (l+1 >= rem)
259 goto notrans;
260 trans += l+1;
263 errno = old_errno;
264 return (char *)trans;
267 char *dcgettext(const char *domainname, const char *msgid, int category)
269 return dcngettext(domainname, msgid, 0, 1, category);
272 char *dngettext(const char *domainname, const char *msgid1, const char *msgid2, unsigned long int n)
274 return dcngettext(domainname, msgid1, msgid2, n, LC_MESSAGES);
277 char *dgettext(const char *domainname, const char *msgid)
279 return dcngettext(domainname, msgid, 0, 1, LC_MESSAGES);