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
  14 struct binding {
  15         struct binding *next;
  16         int dirlen;
  17         volatile int active;
  18         char *domainname;
  19         char *dirname;
  20         char buf[];
  21 };
  22
  23 static void *volatile bindings;
  24
  25 static char *gettextdir(const char *domainname, size_t *dirlen)
  26 {
  27         struct binding *p;
  28         for (p=bindings; p; p=p->next) {
  29                 if (!strcmp(p->domainname, domainname) && p->active) {
  30                         *dirlen = p->dirlen;
  31                         return (char *)p->dirname;
  32                 }
  33         }
  34         return 0;
  35 }
  36
  37 char *bindtextdomain(const char *domainname, const char *dirname)
  38 {
  39         static volatile int lock[1];
  40         struct binding *p, *q;
  41
  42         if (!domainname) return 0;
  43         if (!dirname) return gettextdir(domainname, &(size_t){0});
  44
  45         size_t domlen = strnlen(domainname, NAME_MAX+1);
  46         size_t dirlen = strnlen(dirname, PATH_MAX);
  47         if (domlen > NAME_MAX || dirlen >= PATH_MAX) {
  48                 errno = EINVAL;
  49                 return 0;
  50         }
  51
  52         LOCK(lock);
  53
  54         for (p=bindings; p; p=p->next) {
  55                 if (!strcmp(p->domainname, domainname) &&
  56                     !strcmp(p->dirname, dirname)) {
  57                         break;
  58                 }
  59         }
  60
  61         if (!p) {
  62                 p = calloc(sizeof *p + domlen + dirlen + 2, 1);
  63                 if (!p) {
  64                         UNLOCK(lock);
  65                         return 0;
  66                 }
  67                 p->next = bindings;
  68                 p->dirlen = dirlen;
  69                 p->domainname = p->buf;
  70                 p->dirname = p->buf + domlen + 1;
  71                 memcpy(p->domainname, domainname, domlen+1);
  72                 memcpy(p->dirname, dirname, dirlen+1);
  73                 a_cas_p(&bindings, bindings, p);
  74         }
  75
  76         a_store(&p->active, 1);
  77
  78         for (q=bindings; q; q=q->next) {
  79                 if (!strcmp(q->domainname, domainname) && q != p)
  80                         a_store(&q->active, 0);
  81         }
  82
  83         UNLOCK(lock);
  84
  85         return (char *)p->dirname;
  86 }
  87
  88 static const char catnames[][12] = {
  89         "LC_CTYPE",
  90         "LC_NUMERIC",
  91         "LC_TIME",
  92         "LC_COLLATE",
  93         "LC_MONETARY",
  94         "LC_MESSAGES",
  95 };
  96
  97 static const char catlens[] = { 8, 10, 7, 10, 11, 11 };
  98
  99 struct msgcat {
 100         struct msgcat *next;
 101         const void *map;
 102         size_t map_size;
 103         const char *plural_rule;
 104         int nplurals;
 105         struct binding *binding;
 106         const struct __locale_map *lm;
 107         int cat;
 108 };
 109
 110 static char *dummy_gettextdomain()
 111 {
 112         return "messages";
 113 }
 114
 115 weak_alias(dummy_gettextdomain, __gettextdomain);
 116
 117 char *dcngettext(const char *domainname, const char *msgid1, const char *msgid2, unsigned long int n, int category)
 118 {
 119         static struct msgcat *volatile cats;
 120         struct msgcat *p;
 121         struct __locale_struct *loc = CURRENT_LOCALE;
 122         const struct __locale_map *lm;
 123         size_t domlen;
 124         struct binding *q;
 125         int old_errno = errno;
 126
 127         if ((unsigned)category >= LC_ALL) goto notrans;
 128
 129         if (!domainname) domainname = __gettextdomain();
 130
 131         domlen = strnlen(domainname, NAME_MAX+1);
 132         if (domlen > NAME_MAX) goto notrans;
 133
 134         for (q=bindings; q; q=q->next)
 135                 if (!strcmp(q->domainname, domainname) && q->active)
 136                         break;
 137         if (!q) goto notrans;
 138
 139         lm = loc->cat[category];
 140         if (!lm) {
 141 notrans:
 142                 errno = old_errno;
 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
 206                 const char *rule = "n!=1;";
 207                 unsigned long np = 2;
 208                 const char *r = __mo_lookup(p->map, p->map_size, "");
 209                 char *z;
 210                 while (r && strncmp(r, "Plural-Forms:", 13)) {
 211                         z = strchr(r, '\n');
 212                         r = z ? z+1 : 0;
 213                 }
 214                 if (r) {
 215                         r += 13;
 216                         while (isspace(*r)) r++;
 217                         if (!strncmp(r, "nplurals=", 9)) {
 218                                 np = strtoul(r+9, &z, 10);
 219                                 r = z;
 220                         }
 221                         while (*r && *r != ';') r++;
 222                         if (*r) {
 223                                 r++;
 224                                 while (isspace(*r)) r++;
 225                                 if (!strncmp(r, "plural=", 7))
 226                                         rule = r+7;
 227                         }
 228                 }
 229                 p->nplurals = np;
 230                 p->plural_rule = rule;
 231
 232                 do {
 233                         old_cats = cats;
 234                         p->next = old_cats;
 235                 } while (a_cas_p(&cats, old_cats, p) != old_cats);
 236         }
 237
 238         const char *trans = __mo_lookup(p->map, p->map_size, msgid1);
 239         if (!trans) goto notrans;
 240
 241         /* Non-plural-processing gettext forms pass a null pointer as
 242          * msgid2 to request that dcngettext suppress plural processing. */
 243
 244         if (msgid2 && p->nplurals) {
 245                 unsigned long plural = __pleval(p->plural_rule, n);
 246                 if (plural > p->nplurals) goto notrans;
 247                 while (plural--) {
 248                         size_t rem = p->map_size - (trans - (char *)p->map);
 249                         size_t l = strnlen(trans, rem);
 250                         if (l+1 >= rem)
 251                                 goto notrans;
 252                         trans += l+1;
 253                 }
 254         }
 255         errno = old_errno;
 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 }