src/locale/locale_map.c

   1 #include <locale.h>
   2 #include <string.h>
   3 #include <sys/mman.h>
   4 #include "locale_impl.h"
   5 #include "libc.h"
   6 #include "lock.h"
   7
   8 const char *__lctrans_impl(const char *msg, const struct __locale_map *lm)
   9 {
  10         const char *trans = 0;
  11         if (lm) trans = __mo_lookup(lm->map, lm->map_size, msg);
  12         return trans ? trans : msg;
  13 }
  14
  15 static const char envvars[][12] = {
  16         "LC_CTYPE",
  17         "LC_NUMERIC",
  18         "LC_TIME",
  19         "LC_COLLATE",
  20         "LC_MONETARY",
  21         "LC_MESSAGES",
  22 };
  23
  24 const struct __locale_map *__get_locale(int cat, const char *val)
  25 {
  26         static volatile int lock[1];
  27         static void *volatile loc_head;
  28         const struct __locale_map *p;
  29         struct __locale_map *new = 0;
  30         const char *path = 0, *z;
  31         char buf[256];
  32         size_t l, n;
  33
  34         if (!*val) {
  35                 (val = getenv("LC_ALL")) && *val ||
  36                 (val = getenv(envvars[cat])) && *val ||
  37                 (val = getenv("LANG")) && *val ||
  38                 (val = "C.UTF-8");
  39         }
  40
  41         /* Limit name length and forbid leading dot or any slashes. */
  42         for (n=0; n<LOCALE_NAME_MAX && val[n] && val[n]!='/'; n++);
  43         if (val[0]=='.' || val[n]) val = "C.UTF-8";
  44         int builtin = (val[0]=='C' && !val[1])
  45                 || !strcmp(val, "C.UTF-8")
  46                 || !strcmp(val, "POSIX");
  47
  48         if (builtin) {
  49                 if (cat == LC_CTYPE && val[1]=='.')
  50                         return (void *)&__c_dot_utf8;
  51                 return 0;
  52         }
  53
  54         for (p=loc_head; p; p=p->next)
  55                 if (!strcmp(val, p->name)) return p;
  56
  57         LOCK(lock);
  58
  59         for (p=loc_head; p; p=p->next)
  60                 if (!strcmp(val, p->name)) {
  61                         UNLOCK(lock);
  62                         return p;
  63                 }
  64
  65         if (!libc.secure) path = getenv("MUSL_LOCPATH");
  66         /* FIXME: add a default path? */
  67
  68         if (path) for (; *path; path=z+!!*z) {
  69                 z = __strchrnul(path, ':');
  70                 l = z - path - !!*z;
  71                 if (l >= sizeof buf - n - 2) continue;
  72                 memcpy(buf, path, l);
  73                 buf[l] = '/';
  74                 memcpy(buf+l+1, val, n);
  75                 buf[l+1+n] = 0;
  76                 size_t map_size;
  77                 const void *map = __map_file(buf, &map_size);
  78                 if (map) {
  79                         new = malloc(sizeof *new);
  80                         if (!new) {
  81                                 __munmap((void *)map, map_size);
  82                                 break;
  83                         }
  84                         new->map = map;
  85                         new->map_size = map_size;
  86                         memcpy(new->name, val, n);
  87                         new->name[n] = 0;
  88                         new->next = loc_head;
  89                         loc_head = new;
  90                         break;
  91                 }
  92         }
  93
  94         /* If no locale definition was found, make a locale map
  95          * object anyway to store the name, which is kept for the
  96          * sake of being able to do message translations at the
  97          * application level. */
  98         if (!new && (new = malloc(sizeof *new))) {
  99                 new->map = __c_dot_utf8.map;
 100                 new->map_size = __c_dot_utf8.map_size;
 101                 memcpy(new->name, val, n);
 102                 new->name[n] = 0;
 103                 new->next = loc_head;
 104                 loc_head = new;
 105         }
 106
 107         /* For LC_CTYPE, never return a null pointer unless the
 108          * requested name was "C" or "POSIX". */
 109         if (!new && cat == LC_CTYPE) new = (void *)&__c_dot_utf8;
 110
 111         UNLOCK(lock);
 112         return new;
 113 }