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 <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 }