71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include "locale_impl.h"
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#include "lock.h"
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#define malloc __libc_malloc
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#define calloc undef
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#define realloc undef
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#define free undef
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static int default_locale_init_done;
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static struct __locale_struct default_locale, default_ctype_locale;
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int __loc_is_allocated(locale_t loc)
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{
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return loc && loc != C_LOCALE && loc != UTF8_LOCALE
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&& loc != &default_locale && loc != &default_ctype_locale;
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}
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static locale_t do_newlocale(int mask, const char *name, locale_t loc)
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{
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struct __locale_struct tmp;
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for (int i=0; i<LC_ALL; i++) {
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tmp.cat[i] = (!(mask & (1<<i)) && loc) ? loc->cat[i] :
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__get_locale(i, (mask & (1<<i)) ? name : "");
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if (tmp.cat[i] == LOC_MAP_FAILED)
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return 0;
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}
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/* For locales with allocated storage, modify in-place. */
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if (__loc_is_allocated(loc)) {
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*loc = tmp;
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return loc;
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}
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/* Otherwise, first see if we can use one of the builtin locales.
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* This makes the common usage case for newlocale, getting a C locale
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* with predictable behavior, very fast, and more importantly, fail-safe. */
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if (!memcmp(&tmp, C_LOCALE, sizeof tmp)) return C_LOCALE;
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if (!memcmp(&tmp, UTF8_LOCALE, sizeof tmp)) return UTF8_LOCALE;
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/* And provide builtins for the initial default locale, and a
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* variant of the C locale honoring the default locale's encoding. */
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if (!default_locale_init_done) {
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for (int i=0; i<LC_ALL; i++)
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default_locale.cat[i] = __get_locale(i, "");
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default_ctype_locale.cat[LC_CTYPE] = default_locale.cat[LC_CTYPE];
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default_locale_init_done = 1;
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}
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if (!memcmp(&tmp, &default_locale, sizeof tmp)) return &default_locale;
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if (!memcmp(&tmp, &default_ctype_locale, sizeof tmp))
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return &default_ctype_locale;
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/* If no builtin locale matched, attempt to allocate and copy. */
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if ((loc = malloc(sizeof *loc))) *loc = tmp;
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return loc;
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}
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locale_t __newlocale(int mask, const char *name, locale_t loc)
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{
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LOCK(__locale_lock);
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loc = do_newlocale(mask, name, loc);
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UNLOCK(__locale_lock);
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return loc;
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}
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weak_alias(__newlocale, newlocale);
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