src/locale/dcngettext.c

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