Add function name to PyArg_ParseTuple()

This causes the supplied function name to appear in any error message, making the error message friendlier and relieving us from having to provide our own in some cases.

Author: petere

src/pl/plpython/plpy_cursorobject.c

@@ -406,7 +406,7 @@ PLy_cursor_fetch(PyObject *self, PyObject *args)
 volatile ResourceOwner oldowner;
 Portalportal;
 
-if (!PyArg_ParseTuple(args, "i", &count))
+if (!PyArg_ParseTuple(args, "i:fetch", &count))
 return NULL;
 
 cursor = (PLyCursorObject *) self;

src/pl/plpython/plpy_planobject.c

@@ -114,12 +114,11 @@ PLy_plan_dealloc(PyObject *arg)
 static PyObject *
 PLy_plan_status(PyObject *self, PyObject *args)
 {
-if (PyArg_ParseTuple(args, ""))
+if (PyArg_ParseTuple(args, ":status"))
 {
 Py_INCREF(Py_True);
 return Py_True;
 /* return PyInt_FromLong(self->status); */
 }
-PLy_exception_set(PLy_exc_error, "plan.status takes no arguments");
 return NULL;
 }

src/pl/plpython/plpy_plpymodule.c

@@ -323,7 +323,7 @@ PLy_quote_literal(PyObject *self, PyObject *args)
 char *quoted;
 PyObject *ret;
 
-if (!PyArg_ParseTuple(args, "s", &str))
+if (!PyArg_ParseTuple(args, "s:quote_literal", &str))
 return NULL;
 
 quoted = quote_literal_cstr(str);
@@ -340,7 +340,7 @@ PLy_quote_nullable(PyObject *self, PyObject *args)
 char *quoted;
 PyObject *ret;
 
-if (!PyArg_ParseTuple(args, "z", &str))
+if (!PyArg_ParseTuple(args, "z:quote_nullable", &str))
 return NULL;
 
 if (str == NULL)
@@ -360,7 +360,7 @@ PLy_quote_ident(PyObject *self, PyObject *args)
 const char *quoted;
 PyObject *ret;
 
-if (!PyArg_ParseTuple(args, "s", &str))
+if (!PyArg_ParseTuple(args, "s:quote_ident", &str))
 return NULL;
 
 quoted = quote_identifier(str);

src/pl/plpython/plpy_spi.c

@@ -51,7 +51,7 @@ PLy_spi_prepare(PyObject *self, PyObject *args)
 volatile ResourceOwner oldowner;
 volatile int nargs;
 
-if (!PyArg_ParseTuple(args, "s|O", &query, &list))
+if (!PyArg_ParseTuple(args, "s|O:prepare", &query, &list))
 return NULL;
 
 if (list && (!PySequence_Check(list)))