src/locale/newlocale.c

   1 #include <stdlib.h>
   2 #include <string.h>
   3 #include "locale_impl.h"
   4 #include "libc.h"
   5
   6 int __loc_is_allocated(locale_t loc)
   7 {
   8         return loc && loc != C_LOCALE && loc != UTF8_LOCALE;
   9 }
  10
  11 locale_t __newlocale(int mask, const char *name, locale_t loc)
  12 {
  13         int i, j;
  14         struct __locale_struct tmp;
  15         const struct __locale_map *lm;
  16
  17         /* For locales with allocated storage, modify in-place. */
  18         if (__loc_is_allocated(loc)) {
  19                 for (i=0; i<LC_ALL; i++)
  20                         if (mask & (1<<i))
  21                                 loc->cat[i] = __get_locale(i, name);
  22                 return loc;
  23         }
  24
  25         /* Otherwise, build a temporary locale object, which will only
  26          * be instantiated in allocated storage if it does not match
  27          * one of the built-in static locales. This makes the common
  28          * usage case for newlocale, getting a C locale with predictable
  29          * behavior, very fast, and more importantly, fail-safe. */
  30         for (j=i=0; i<LC_ALL; i++) {
  31                 if (loc && !(mask & (1<<i)))
  32                         lm = loc->cat[i];
  33                 else
  34                         lm = __get_locale(i, mask & (1<<i) ? name : "");
  35                 if (lm) j++;
  36                 tmp.cat[i] = lm;
  37         }
  38
  39         if (!j)
  40                 return C_LOCALE;
  41         if (j==1 && tmp.cat[LC_CTYPE]==&__c_dot_utf8)
  42                 return UTF8_LOCALE;
  43
  44         if ((loc = malloc(sizeof *loc))) *loc = tmp;
  45
  46         return loc;
  47 }
  48
  49 weak_alias(__newlocale, newlocale);