+locale_t __newlocale(int mask, const char *name, locale_t loc)
+{
+ int i, j;
+ struct __locale_struct tmp;
+ const struct __locale_map *lm;
+
+ /* For locales with allocated storage, modify in-place. */
+ if (__loc_is_allocated(loc)) {
+ for (i=0; i<LC_ALL; i++)
+ if (mask & (1<<i))
+ loc->cat[i] = __get_locale(i, name);
+ return loc;
+ }
+
+ /* Otherwise, build a temporary locale object, which will only
+ * be instantiated in allocated storage if it does not match
+ * one of the built-in static locales. This makes the common
+ * usage case for newlocale, getting a C locale with predictable
+ * behavior, very fast, and more importantly, fail-safe. */
+ for (j=i=0; i<LC_ALL; i++) {
+ if (loc && !(mask & (1<<i)))
+ lm = loc->cat[i];
+ else
+ lm = __get_locale(i, mask & (1<<i) ? name : "");
+ if (lm) j++;
+ tmp.cat[i] = lm;
+ }
+
+ if (!j)
+ return C_LOCALE;
+ if (j==1 && tmp.cat[LC_CTYPE]==&__c_dot_utf8)
+ return UTF8_LOCALE;
+
+ if ((loc = malloc(sizeof *loc))) *loc = tmp;
+
+ return loc;
+}
+
+weak_alias(__newlocale, newlocale);