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authorRich Felker <dalias@aerifal.cx>2015-05-27 15:54:47 -0400
committerRich Felker <dalias@aerifal.cx>2015-05-27 15:54:47 -0400
commitaeeac9ca5490d7d90fe061ab72da446c01ddf746 (patch)
tree4f74e2fb42ef8ac46151fe9037c41bb8b5eff52b /src/locale
parent11858d31aa020df3e7e7dedf49f9870ce12f31cc (diff)
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implement fail-safe static locales for newlocale
this frees applications which need to make temporary use of the C locale (via uselocale) from the possibility that newlocale might fail. the C.UTF-8 locale is also provided as a static locale. presently they behave the same, but this may change in the future.
Diffstat (limited to 'src/locale')
-rw-r--r--src/locale/freelocale.c4
-rw-r--r--src/locale/locale_map.c6
-rw-r--r--src/locale/newlocale.c49
3 files changed, 46 insertions, 13 deletions
diff --git a/src/locale/freelocale.c b/src/locale/freelocale.c
index ee3f029a..c2ae1a31 100644
--- a/src/locale/freelocale.c
+++ b/src/locale/freelocale.c
@@ -2,9 +2,11 @@
#include "locale_impl.h"
#include "libc.h"
+int __loc_is_allocated(locale_t);
+
void freelocale(locale_t l)
{
- free(l);
+ if (__loc_is_allocated(l)) free(l);
}
weak_alias(freelocale, __freelocale);
diff --git a/src/locale/locale_map.c b/src/locale/locale_map.c
index 30aa7fcc..4346bb02 100644
--- a/src/locale/locale_map.c
+++ b/src/locale/locale_map.c
@@ -26,7 +26,7 @@ static const char envvars[][12] = {
static const uint32_t empty_mo[] = { 0x950412de, 0, -1, -1, -1 };
-static const struct __locale_map c_dot_utf8 = {
+const struct __locale_map __c_dot_utf8 = {
.map = empty_mo,
.map_size = sizeof empty_mo,
.name = "C.UTF-8"
@@ -58,7 +58,7 @@ const struct __locale_map *__get_locale(int cat, const char *val)
if (builtin) {
if (cat == LC_CTYPE && val[1]=='.')
- return (void *)&c_dot_utf8;
+ return (void *)&__c_dot_utf8;
return 0;
}
@@ -117,7 +117,7 @@ const struct __locale_map *__get_locale(int cat, const char *val)
/* For LC_CTYPE, never return a null pointer unless the
* requested name was "C" or "POSIX". */
- if (!new && cat == LC_CTYPE) new = (void *)&c_dot_utf8;
+ if (!new && cat == LC_CTYPE) new = (void *)&__c_dot_utf8;
UNLOCK(lock);
return new;
diff --git a/src/locale/newlocale.c b/src/locale/newlocale.c
index 4e0cbd34..89d36b1d 100644
--- a/src/locale/newlocale.c
+++ b/src/locale/newlocale.c
@@ -3,21 +3,52 @@
#include "locale_impl.h"
#include "libc.h"
+extern const struct __locale_map __c_dot_utf8;
+
+static const struct __locale_struct c_locale = { 0 };
+static const struct __locale_struct c_dot_utf8_locale = {
+ .cat[LC_CTYPE] = &__c_dot_utf8
+};
+
+int __loc_is_allocated(locale_t loc)
+{
+ return loc && loc != &c_locale && loc != &c_dot_utf8_locale;
+}
+
locale_t __newlocale(int mask, const char *name, locale_t loc)
{
- int i;
+ int i, j;
+ struct __locale_struct tmp;
+ const struct __locale_map *lm;
- if (!loc) {
- loc = malloc(sizeof *loc);
- if (!loc) return 0;
+ /* 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, "");
+ 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;
}
- for (i=0; i<LC_ALL; i++)
- if (mask & (1<<i))
- loc->cat[i] = __get_locale(i, name);
+ if (!j)
+ return (locale_t)&c_locale;
+ if (j==1 && tmp.cat[LC_CTYPE]==c_dot_utf8_locale.cat[LC_CTYPE])
+ return (locale_t)&c_dot_utf8_locale;
+
+ if ((loc = malloc(sizeof *loc))) *loc = tmp;
return loc;
}