src/locale/locale_map.c

   1 #include <locale.h>
   2 #include <string.h>
   3 #include "locale_impl.h"
   4 #include "libc.h"
   5 #include "atomic.h"
   6
   7 const char *__lctrans_impl(const char *msg, const struct __locale_map *lm)
   8 {
   9         const char *trans = 0;
  10         if (lm) trans = __mo_lookup(lm->map, lm->map_size, msg);
  11         return trans ? trans : msg;
  12 }
  13
  14 const unsigned char *__map_file(const char *, size_t *);
  15 int __munmap(void *, size_t);
  16 char *__strchrnul(const char *, int);
  17
  18 static const char envvars[][12] = {
  19         "LC_CTYPE",
  20         "LC_NUMERIC",
  21         "LC_TIME",
  22         "LC_COLLATE",
  23         "LC_MONETARY",
  24         "LC_MESSAGES",
  25 };
  26
  27 const struct __locale_map *__get_locale(int cat, const char *val)
  28 {
  29         static int lock[2];
  30         static void *volatile loc_head;
  31         const struct __locale_map *p;
  32         struct __locale_map *new = 0;
  33         const char *path = 0, *z;
  34         char buf[256];
  35         size_t l, n;
  36
  37         if (!*val) {
  38                 (val = getenv("LC_ALL")) && *val ||
  39                 (val = getenv(envvars[cat])) && *val ||
  40                 (val = getenv("LANG")) && *val ||
  41                 (val = "C.UTF-8");
  42         }
  43
  44         /* Limit name length and forbid leading dot or any slashes. */
  45         for (n=0; n<LOCALE_NAME_MAX && val[n] && val[n]!='/'; n++);
  46         if (val[0]=='.' || val[n]) val = "C.UTF-8";
  47         int builtin = (val[0]=='C' && !val[1])
  48                 || !strcmp(val, "C.UTF-8")
  49                 || !strcmp(val, "POSIX");
  50
  51         if (builtin) {
  52                 if (cat == LC_CTYPE && val[1]=='.')
  53                         return (void *)&__c_dot_utf8;
  54                 return 0;
  55         }
  56
  57         for (p=loc_head; p; p=p->next)
  58                 if (!strcmp(val, p->name)) return p;
  59
  60         LOCK(lock);
  61
  62         for (p=loc_head; p; p=p->next)
  63                 if (!strcmp(val, p->name)) {
  64                         UNLOCK(lock);
  65                         return p;
  66                 }
  67
  68         if (!libc.secure) path = getenv("MUSL_LOCPATH");
  69         /* FIXME: add a default path? */
  70
  71         if (path) for (; *path; path=z+!!*z) {
  72                 z = __strchrnul(path, ':');
  73                 l = z - path - !!*z;
  74                 if (l >= sizeof buf - n - 2) continue;
  75                 memcpy(buf, path, l);
  76                 buf[l] = '/';
  77                 memcpy(buf+l+1, val, n);
  78                 buf[l+1+n] = 0;
  79                 size_t map_size;
  80                 const void *map = __map_file(buf, &map_size);
  81                 if (map) {
  82                         new = malloc(sizeof *new);
  83                         if (!new) {
  84                                 __munmap((void *)map, map_size);
  85                                 break;
  86                         }
  87                         new->map = map;
  88                         new->map_size = map_size;
  89                         memcpy(new->name, val, n);
  90                         new->name[n] = 0;
  91                         new->next = loc_head;
  92                         loc_head = new;
  93                         break;
  94                 }
  95         }
  96
  97         /* If no locale definition was found, make a locale map
  98          * object anyway to store the name, which is kept for the
  99          * sake of being able to do message translations at the
 100          * application level. */
 101         if (!new && (new = malloc(sizeof *new))) {
 102                 new->map = __c_dot_utf8.map;
 103                 new->map_size = __c_dot_utf8.map_size;
 104                 memcpy(new->name, val, n);
 105                 new->name[n] = 0;
 106                 new->next = loc_head;
 107                 loc_head = new;
 108         }
 109
 110         /* For LC_CTYPE, never return a null pointer unless the
 111          * requested name was "C" or "POSIX". */
 112         if (!new && cat == LC_CTYPE) new = (void *)&__c_dot_utf8;
 113
 114         UNLOCK(lock);
 115         return new;
 116 }