1#include <stdlib.h>
 2#include <string.h>
 3#include <pthread.h>
 4#include "locale_impl.h"
 5#include "lock.h"
 6
 7#define malloc __libc_malloc
 8#define calloc undef
 9#define realloc undef
10#define free undef
11
12static int default_locale_init_done;
13static struct __locale_struct default_locale, default_ctype_locale;
14
15int __loc_is_allocated(locale_t loc)
16{
17	return loc && loc != C_LOCALE && loc != UTF8_LOCALE
18		&& loc != &default_locale && loc != &default_ctype_locale;
19}
20
21static locale_t do_newlocale(int mask, const char *name, locale_t loc)
22{
23	struct __locale_struct tmp;
24
25	for (int i=0; i<LC_ALL; i++) {
26		tmp.cat[i] = (!(mask & (1<<i)) && loc) ? loc->cat[i] :
27			__get_locale(i, (mask & (1<<i)) ? name : "");
28		if (tmp.cat[i] == LOC_MAP_FAILED)
29			return 0;
30	}
31
32	/* For locales with allocated storage, modify in-place. */
33	if (__loc_is_allocated(loc)) {
34		*loc = tmp;
35		return loc;
36	}
37
38	/* Otherwise, first see if we can use one of the builtin locales.
39	 * This makes the common usage case for newlocale, getting a C locale
40	 * with predictable behavior, very fast, and more importantly, fail-safe. */
41	if (!memcmp(&tmp, C_LOCALE, sizeof tmp)) return C_LOCALE;
42	if (!memcmp(&tmp, UTF8_LOCALE, sizeof tmp)) return UTF8_LOCALE;
43
44	/* And provide builtins for the initial default locale, and a
45	 * variant of the C locale honoring the default locale's encoding. */
46	if (!default_locale_init_done) {
47		for (int i=0; i<LC_ALL; i++)
48			default_locale.cat[i] = __get_locale(i, "");
49		default_ctype_locale.cat[LC_CTYPE] = default_locale.cat[LC_CTYPE];
50		default_locale_init_done = 1;
51	}
52	if (!memcmp(&tmp, &default_locale, sizeof tmp)) return &default_locale;
53	if (!memcmp(&tmp, &default_ctype_locale, sizeof tmp))
54		return &default_ctype_locale;
55
56	/* If no builtin locale matched, attempt to allocate and copy. */
57	if ((loc = malloc(sizeof *loc))) *loc = tmp;
58
59	return loc;
60}
61
62locale_t __newlocale(int mask, const char *name, locale_t loc)
63{
64	LOCK(__locale_lock);
65	loc = do_newlocale(mask, name, loc);
66	UNLOCK(__locale_lock);
67	return loc;
68}
69
70weak_alias(__newlocale, newlocale);