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-rw-r--r--Python/_warnings.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/Python/_warnings.c b/Python/_warnings.c
index 458e346aa3..adebd51ed2 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -510,13 +510,14 @@ setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno,
kind = PyUnicode_KIND(*filename);
data = PyUnicode_DATA(*filename);
+#define ascii_lower(c) ((c <= 127) ? Py_TOLOWER(c) : 0)
/* if filename.lower().endswith((".pyc", ".pyo")): */
if (len >= 4 &&
PyUnicode_READ(kind, data, len-4) == '.' &&
- Py_UNICODE_TOLOWER(PyUnicode_READ(kind, data, len-3)) == 'p' &&
- Py_UNICODE_TOLOWER(PyUnicode_READ(kind, data, len-2)) == 'y' &&
- (Py_UNICODE_TOLOWER(PyUnicode_READ(kind, data, len-1)) == 'c' ||
- Py_UNICODE_TOLOWER(PyUnicode_READ(kind, data, len-1)) == 'o'))
+ ascii_lower(PyUnicode_READ(kind, data, len-3)) == 'p' &&
+ ascii_lower(PyUnicode_READ(kind, data, len-2)) == 'y' &&
+ (ascii_lower(PyUnicode_READ(kind, data, len-1)) == 'c' ||
+ ascii_lower(PyUnicode_READ(kind, data, len-1)) == 'o'))
{
*filename = PyUnicode_Substring(*filename, 0,
PyUnicode_GET_LENGTH(*filename)-1);