gh-107915: Handle errors in C API functions PyErr_Set*() and PyErr_Format() (GH-107918)

Such C API functions as PyErr_SetString(), PyErr_Format(),
PyErr_SetFromErrnoWithFilename() and many others no longer crash or
ignore errors if it failed to format the error message or decode the
filename. Instead, they keep a corresponding error.

1 files changed, 63 insertions, 1 deletions

diff --git a/Modules/_testcapi/clinic/exceptions.c.h b/Modules/_testcapi/clinic/exceptions.c.h
index 01730ff..16954a5 100644
--- a/Modules/_testcapi/clinic/exceptions.c.h
+++ b/Modules/_testcapi/clinic/exceptions.c.h
@@ -215,6 +215,68 @@ exit:
     return return_value;
 }
 
+PyDoc_STRVAR(_testcapi_err_setstring__doc__,
+"err_setstring($module, exc, value, /)\n"
+"--\n"
+"\n");
+
+#define _TESTCAPI_ERR_SETSTRING_METHODDEF    \
+    {"err_setstring", _PyCFunction_CAST(_testcapi_err_setstring), METH_FASTCALL, _testcapi_err_setstring__doc__},
+
+static PyObject *
+_testcapi_err_setstring_impl(PyObject *module, PyObject *exc,
+                             const char *value, Py_ssize_t value_length);
+
+static PyObject *
+_testcapi_err_setstring(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
+{
+    PyObject *return_value = NULL;
+    PyObject *exc;
+    const char *value;
+    Py_ssize_t value_length;
+
+    if (!_PyArg_ParseStack(args, nargs, "Oz#:err_setstring",
+        &exc, &value, &value_length)) {
+        goto exit;
+    }
+    return_value = _testcapi_err_setstring_impl(module, exc, value, value_length);
+
+exit:
+    return return_value;
+}
+
+PyDoc_STRVAR(_testcapi_err_setfromerrnowithfilename__doc__,
+"err_setfromerrnowithfilename($module, error, exc, value, /)\n"
+"--\n"
+"\n");
+
+#define _TESTCAPI_ERR_SETFROMERRNOWITHFILENAME_METHODDEF    \
+    {"err_setfromerrnowithfilename", _PyCFunction_CAST(_testcapi_err_setfromerrnowithfilename), METH_FASTCALL, _testcapi_err_setfromerrnowithfilename__doc__},
+
+static PyObject *
+_testcapi_err_setfromerrnowithfilename_impl(PyObject *module, int error,
+                                            PyObject *exc, const char *value,
+                                            Py_ssize_t value_length);
+
+static PyObject *
+_testcapi_err_setfromerrnowithfilename(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
+{
+    PyObject *return_value = NULL;
+    int error;
+    PyObject *exc;
+    const char *value;
+    Py_ssize_t value_length;
+
+    if (!_PyArg_ParseStack(args, nargs, "iOz#:err_setfromerrnowithfilename",
+        &error, &exc, &value, &value_length)) {
+        goto exit;
+    }
+    return_value = _testcapi_err_setfromerrnowithfilename_impl(module, error, exc, value, value_length);
+
+exit:
+    return return_value;
+}
+
 PyDoc_STRVAR(_testcapi_raise_exception__doc__,
 "raise_exception($module, exception, num_args, /)\n"
 "--\n"
@@ -426,4 +488,4 @@ _testcapi_unstable_exc_prep_reraise_star(PyObject *module, PyObject *const *args
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=fd6aef54f195c77b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d574342d716e98b5 input=a9049054013a1b77]*/