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;
}
void freelocale(locale_t l)
{
if (__loc_is_allocated(l)) free(l);
}