1#include <locale.h>
2#include <stdlib.h>
3#include <string.h>
4#include "locale_impl.h"
5#include "libc.h"
6#include "atomic.h"
7
8static char buf[LC_ALL*(LOCALE_NAME_MAX+1)];
9
10static char *setlocale_one_unlocked(int cat, const char *name)
11{
12	const struct __locale_map *lm;
13
14	if (name) libc.global_locale.cat[cat] = lm = __get_locale(cat, name);
15	else lm = libc.global_locale.cat[cat];
16
17	return lm ? (char *)lm->name : "C";
18}
19
20char *__strchrnul(const char *, int);
21
22char *setlocale(int cat, const char *name)
23{
24	static volatile int lock[2];
25
26	if ((unsigned)cat > LC_ALL) return 0;
27
28	LOCK(lock);
29
30	/* For LC_ALL, setlocale is required to return a string which
31	 * encodes the current setting for all categories. The format of
32	 * this string is unspecified, and only the following code, which
33	 * performs both the serialization and deserialization, depends
34	 * on the format, so it can easily be changed if needed. */
35	if (cat == LC_ALL) {
36		int i;
37		if (name) {
38			char part[LOCALE_NAME_MAX+1] = "C.UTF-8";
39			const char *p = name;
40			for (i=0; i<LC_ALL; i++) {
41				const char *z = __strchrnul(p, ';');
42				if (z-p <= LOCALE_NAME_MAX) {
43					memcpy(part, p, z-p);
44					part[z-p] = 0;
45					if (*z) p = z+1;
46				}
47				setlocale_one_unlocked(i, part);
48			}
49		}
50		char *s = buf;
51		for (i=0; i<LC_ALL; i++) {
52			const struct __locale_map *lm =
53				libc.global_locale.cat[i];
54			const char *part = lm ? lm->name : "C";
55			size_t l = strlen(part);
56			memcpy(s, part, l);
57			s[l] = ';';
58			s += l+1;
59		}
60		*--s = 0;
61		UNLOCK(lock);
62		return buf;
63	}
64
65	char *ret = setlocale_one_unlocked(cat, name);
66
67	UNLOCK(lock);
68
69	return ret;
70}
71