Since the return type of format() is not a Decimal, raise ValueError instead of

InvalidOperation if the format specification (width, prec) exceeds the internal
limits of libmpdec.

1 files changed, 7 insertions, 1 deletions

diff --git a/Modules/_decimal/_decimal.c b/Modules/_decimal/_decimal.c
index 5e9fd67..89386ff 100644
--- a/Modules/_decimal/_decimal.c
+++ b/Modules/_decimal/_decimal.c
@@ -3222,7 +3222,13 @@ dec_format(PyObject *dec, PyObject *args)
 
     decstring = mpd_qformat_spec(MPD(dec), &spec, CTX(context), &status);
     if (decstring == NULL) {
-        dec_addstatus(context, status);
+        if (status & MPD_Malloc_error) {
+            PyErr_NoMemory();
+        }
+        else {
+            PyErr_SetString(PyExc_ValueError,
+                "format specification exceeds internal limits of _decimal");
+        }
         goto finish;
     }
     result = PyUnicode_DecodeUTF8(decstring, strlen(decstring), NULL);