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Date: Fri, 08 Dec 2023 10:46:15 +0000
From: Alastair Houghton <ahoughton@...le.com>
To: musl@...ts.openwall.com
Cc: Rich Felker <dalias@...c.org>
Subject: Re: setlocale() again
On 5 Dec 2023, at 15:19, Alastair Houghton <ahoughton@...le.com> wrote:
>
>> Maybe I’ve missed a reply somewhere along the lines; here’s a tentative patch that just does the simple thing of making setlocale(LC_ALL, "") pick the C.UTF-8 locale if it’s unable to find the locale specified in the environment.
>
> [snip]
>
> Hah. So, testing that patch, having removed my hacks to avoid using Musl’s locale support, I find it doesn’t actually work (for two reasons; one, NULL doesn’t mean not found, it means “use ‘C’”; and two, there is some very odd code in setlocale.c that causes things to go wrong if the specified name is longer than LOCALE_NAME_MAX).
>
> I’ll come back with an updated patch in a bit.
Updated patch:
==== Cut here ====
diff --git a/src/locale/locale_map.c b/src/locale/locale_map.c
index da61f7fc..097da1ad 100644
--- a/src/locale/locale_map.c
+++ b/src/locale/locale_map.c
@@ -31,7 +31,7 @@ static const char envvars[][12] = {
volatile int __locale_lock[1];
volatile int *const __locale_lockptr = __locale_lock;
-const struct __locale_map *__get_locale(int cat, const char *val)
+const struct __locale_map *__get_locale(int cat, const char *locale)
{
static void *volatile loc_head;
const struct __locale_map *p;
@@ -39,6 +39,7 @@ const struct __locale_map *__get_locale(int cat, const char *val)
const char *path = 0, *z;
char buf[256];
size_t l, n;
+ const char *val = locale;
if (!*val) {
(val = getenv("LC_ALL")) && *val ||
@@ -92,22 +93,18 @@ const struct __locale_map *__get_locale(int cat, const char *val)
}
}
- /* If no locale definition was found, make a locale map
- * object anyway to store the name, which is kept for the
- * sake of being able to do message translations at the
- * application level. */
- if (!new && (new = malloc(sizeof *new))) {
- new->map = __c_dot_utf8.map;
- new->map_size = __c_dot_utf8.map_size;
- memcpy(new->name, val, n);
- new->name[n] = 0;
- new->next = loc_head;
- loc_head = new;
- }
+ /* If no locale definition was found, and we specified a
+ * locale name of "", return the C.UTF-8 locale. */
+ if (!new && !*locale) new = (void *)&__c_dot_utf8;
/* 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;
+ /* Returning NULL means "C locale"; if we get here and
+ * there's no locale, return failure instead. */
+ if (!new)
+ return LOC_MAP_FAILED;
+
return new;
}
diff --git a/src/locale/setlocale.c b/src/locale/setlocale.c
index 360c4437..9842d95d 100644
--- a/src/locale/setlocale.c
+++ b/src/locale/setlocale.c
@@ -28,12 +28,14 @@ char *setlocale(int cat, const char *name)
const char *p = name;
for (i=0; i<LC_ALL; i++) {
const char *z = __strchrnul(p, ';');
- if (z-p <= LOCALE_NAME_MAX) {
+ if (z-p > LOCALE_NAME_MAX)
+ lm = LOC_MAP_FAILED;
+ else {
memcpy(part, p, z-p);
part[z-p] = 0;
if (*z) p = z+1;
+ lm = __get_locale(i, part);
}
- lm = __get_locale(i, part);
if (lm == LOC_MAP_FAILED) {
UNLOCK(__locale_lock);
return 0;
==== Cut here ====
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