From f5fea3b8b85462bf2a42a6e2d2aa609b643ce7bc Mon Sep 17 00:00:00 2001
From: Sergey B Kirpichev <skirpichev@gmail.com>
Date: Wed, 18 Sep 2024 11:39:11 +0300
Subject: [PATCH] gh-119771: Set errno on overflows in _Py_c_pow() (#120256)

Before we did this in complex_pow() and behavior of the public C API
function _Py_c_pow() was different from the pure-python pow().
---
 Doc/c-api/complex.rst                                       | 2 ++
 Lib/test/test_capi/test_complex.py                          | 6 +++++-
 .../C API/2024-06-08-08-33-40.gh-issue-119771.Oip2dL.rst    | 2 ++
 Objects/complexobject.c                                     | 4 +++-
 4 files changed, 12 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/C API/2024-06-08-08-33-40.gh-issue-119771.Oip2dL.rst

diff --git a/Doc/c-api/complex.rst b/Doc/c-api/complex.rst
index 67d0c5f144e0753..16bd79475dc1e66 100644
--- a/Doc/c-api/complex.rst
+++ b/Doc/c-api/complex.rst
@@ -79,6 +79,8 @@ pointers.  This is consistent throughout the API.
    If *num* is null and *exp* is not a positive real number,
    this method returns zero and sets :c:data:`errno` to :c:macro:`!EDOM`.
 
+   Set :c:data:`errno` to :c:macro:`!ERANGE` on overflows.
+
 
 Complex Numbers as Python Objects
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/Lib/test/test_capi/test_complex.py b/Lib/test/test_capi/test_complex.py
index 328ea12f97462c1..368edfbf2ce97ee 100644
--- a/Lib/test/test_capi/test_complex.py
+++ b/Lib/test/test_capi/test_complex.py
@@ -226,7 +226,11 @@ def test_py_c_pow(self):
 
         self.assertEqual(_py_c_pow(0j, -1)[1], errno.EDOM)
         self.assertEqual(_py_c_pow(0j, 1j)[1], errno.EDOM)
-        self.assertEqual(_py_c_pow(*[DBL_MAX+1j]*2)[0], complex(*[INF]*2))
+        max_num = DBL_MAX+1j
+        self.assertEqual(_py_c_pow(max_num, max_num),
+                         (complex(INF, INF), errno.ERANGE))
+        self.assertEqual(_py_c_pow(max_num, 2),
+                         (complex(INF, INF), errno.ERANGE))
 
 
     def test_py_c_abs(self):
diff --git a/Misc/NEWS.d/next/C API/2024-06-08-08-33-40.gh-issue-119771.Oip2dL.rst b/Misc/NEWS.d/next/C API/2024-06-08-08-33-40.gh-issue-119771.Oip2dL.rst
new file mode 100644
index 000000000000000..61619082487c3b6
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2024-06-08-08-33-40.gh-issue-119771.Oip2dL.rst	
@@ -0,0 +1,2 @@
+Set :data:`errno` in :c:func:`_Py_c_pow` on overflows.  Patch by Sergey B
+Kirpichev.
diff --git a/Objects/complexobject.c b/Objects/complexobject.c
index 4a8dac6c53f5295..787235c63a6be12 100644
--- a/Objects/complexobject.c
+++ b/Objects/complexobject.c
@@ -173,6 +173,8 @@ _Py_c_pow(Py_complex a, Py_complex b)
         }
         r.real = len*cos(phase);
         r.imag = len*sin(phase);
+
+        _Py_ADJUST_ERANGE2(r.real, r.imag);
     }
     return r;
 }
@@ -567,12 +569,12 @@ complex_pow(PyObject *v, PyObject *w, PyObject *z)
     // a faster and more accurate algorithm.
     if (b.imag == 0.0 && b.real == floor(b.real) && fabs(b.real) <= 100.0) {
         p = c_powi(a, (long)b.real);
+        _Py_ADJUST_ERANGE2(p.real, p.imag);
     }
     else {
         p = _Py_c_pow(a, b);
     }
 
-    _Py_ADJUST_ERANGE2(p.real, p.imag);
     if (errno == EDOM) {
         PyErr_SetString(PyExc_ZeroDivisionError,
                         "zero to a negative or complex power");