do a backport of r75928
The added test does not fail without the patch, but we still fix the issue of
surrogates being used in wide builds where they should not be.
diff --git a/Python/ast.c b/Python/ast.c
index 347da2a..7f379a5 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -3289,10 +3289,11 @@
u = NULL;
} else {
/* check for integer overflow */
- if (len > PY_SIZE_MAX / 4)
+ if (len > PY_SIZE_MAX / 6)
return NULL;
- /* "\XX" may become "\u005c\uHHLL" (12 bytes) */
- u = PyString_FromStringAndSize((char *)NULL, len * 4);
+ /* "<C3><A4>" (2 bytes) may become "\U000000E4" (10 bytes), or 1:5
+ "\ä" (3 bytes) may become "\u005c\U000000E4" (16 bytes), or ~1:6 */
+ u = PyString_FromStringAndSize((char *)NULL, len * 6);
if (u == NULL)
return NULL;
p = buf = PyString_AsString(u);
@@ -3309,19 +3310,21 @@
PyObject *w;
char *r;
Py_ssize_t rn, i;
- w = decode_utf8(c, &s, end, "utf-16-be");
+ w = decode_utf8(c, &s, end, "utf-32-be");
if (w == NULL) {
Py_DECREF(u);
return NULL;
}
r = PyString_AsString(w);
rn = PyString_Size(w);
- assert(rn % 2 == 0);
- for (i = 0; i < rn; i += 2) {
- sprintf(p, "\\u%02x%02x",
+ assert(rn % 4 == 0);
+ for (i = 0; i < rn; i += 4) {
+ sprintf(p, "\\U%02x%02x%02x%02x",
r[i + 0] & 0xFF,
- r[i + 1] & 0xFF);
- p += 6;
+ r[i + 1] & 0xFF,
+ r[i + 2] & 0xFF,
+ r[i + 3] & 0xFF);
+ p += 10;
}
Py_DECREF(w);
} else {