src/locale/locale_map.c

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