bpo-34523: Fix C locale coercion on FreeBSD CURRENT (GH-10672) (GH-10673)

bpo-34523, bpo-35290: C locale coercion now resets the Python
internal "force ASCII" mode. This change fix the filesystem encoding
on FreeBSD CURRENT, which has a new "C.UTF-8" locale, when
the UTF-8 mode is disabled.

Add _Py_ResetForceASCII(): _Py_SetLocaleFromEnv() now calls it.

(cherry picked from commit 353933e712b6c7f7ba9a9a50bd5bd472db7c35d0)

2 files changed, 19 insertions, 4 deletions

diff --git a/Python/fileutils.c b/Python/fileutils.c
index b77e490ce2..5e71d37526 100644
--- a/Python/fileutils.c
+++ b/Python/fileutils.c
@@ -191,6 +191,12 @@ _Py_GetForceASCII(void)
 }
 
 
+void
+_Py_ResetForceASCII(void)
+{
+    force_ascii = -1;
+}
+
 
 static int
 encode_ascii(const wchar_t *text, char **str,
@@ -252,6 +258,12 @@ _Py_GetForceASCII(void)
 {
     return 0;
 }
+
+void
+_Py_ResetForceASCII(void)
+{
+    /* nothing to do */
+}
 #endif   /* !defined(__APPLE__) && !defined(__ANDROID__) && !defined(MS_WINDOWS) */
 
 
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 86f95de833..4b08c9c2b2 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -523,6 +523,7 @@ done:
 char *
 _Py_SetLocaleFromEnv(int category)
 {
+    char *res;
 #ifdef __ANDROID__
     const char *locale;
     const char **pvar;
@@ -569,10 +570,12 @@ _Py_SetLocaleFromEnv(int category)
         }
     }
 #endif
-    return setlocale(category, utf8_locale);
-#else /* __ANDROID__ */
-    return setlocale(category, "");
-#endif /* __ANDROID__ */
+    res = setlocale(category, utf8_locale);
+#else /* !defined(__ANDROID__) */
+    res = setlocale(category, "");
+#endif
+    _Py_ResetForceASCII();
+    return res;
 }