fix localeconv field value for unavailable values
[musl] / src / locale / setlocale.c
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
8 static char buf[LC_ALL*(LOCALE_NAME_MAX+1)];
9
10 static 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
20 char *__strchrnul(const char *, int);
21
22 char *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 }