Issue #18711: Add a new `PyErr_FormatV` function, similar to `PyErr_Format` but accepting a `va_list` argument.

1 files changed, 15 insertions, 10 deletions

diff --git a/Python/errors.c b/Python/errors.c
index 996292a044..fd55142525 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -749,19 +749,11 @@ PyErr_BadInternalCall(void)
 #define PyErr_BadInternalCall() _PyErr_BadInternalCall(__FILE__, __LINE__)
 
 
-
 PyObject *
-PyErr_Format(PyObject *exception, const char *format, ...)
+PyErr_FormatV(PyObject *exception, const char *format, va_list vargs)
 {
-    va_list vargs;
     PyObject* string;
 
-#ifdef HAVE_STDARG_PROTOTYPES
-    va_start(vargs, format);
-#else
-    va_start(vargs);
-#endif
-
 #ifdef Py_DEBUG
     /* in debug mode, PyEval_EvalFrameEx() fails with an assertion error
        if an exception is set when it is called */
@@ -771,11 +763,24 @@ PyErr_Format(PyObject *exception, const char *format, ...)
     string = PyUnicode_FromFormatV(format, vargs);
     PyErr_SetObject(exception, string);
     Py_XDECREF(string);
-    va_end(vargs);
     return NULL;
 }
 
 
+PyObject *
+PyErr_Format(PyObject *exception, const char *format, ...)
+{
+    va_list vargs;
+#ifdef HAVE_STDARG_PROTOTYPES
+    va_start(vargs, format);
+#else
+    va_start(vargs);
+#endif
+    PyErr_FormatV(exception, format, vargs);
+    va_end(vargs);
+    return NULL;
+}
+
 
 PyObject *
 PyErr_NewException(const char *name, PyObject *base, PyObject *dict)