Revert r56044 (which changed the %c format specifier to accept a

unicode char into an int variable) and add %C which does this.

Modules/arraymodule.c

@@ -1785,7 +1785,7 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 	if (type == &Arraytype && !_PyArg_NoKeywords("array.array()", kwds))
 		return NULL;
 
-	if (!PyArg_ParseTuple(args, "c|O:array", &c, &initial))
+	if (!PyArg_ParseTuple(args, "C|O:array", &c, &initial))
 		return NULL;
 
 	if (!(initial == NULL || PyList_Check(initial)

Modules/datetimemodule.c

@@ -4033,7 +4033,7 @@ datetime_isoformat(PyDateTime_DateTime *self, PyObject *args, PyObject *kw)
 	PyObject *result;
 	int us = DATE_GET_MICROSECOND(self);
 
-	if (!PyArg_ParseTupleAndKeywords(args, kw, "|c:isoformat", keywords, &sep))
+	if (!PyArg_ParseTupleAndKeywords(args, kw, "|C:isoformat", keywords, &sep))
 		return NULL;
 	if (us)
 		result = PyUnicode_FromFormat("%04d-%02d-%02d%c%02d:%02d:%02d.%06d",

Python/getargs.c

@@ -761,6 +761,19 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
 #endif /* WITHOUT_COMPLEX */
 	
 	case 'c': {/* char */
+		char *p = va_arg(*p_va, char *);
+		if (PyString_Check(arg) && PyString_Size(arg) == 1)
+			*p = PyString_AS_STRING(arg)[0];
+		else if (PyUnicode_Check(arg) &&
+			 PyUnicode_GET_SIZE(arg) == 1 &&
+			 PyUnicode_AS_UNICODE(arg)[0] < 256)
+			*p = PyUnicode_AS_UNICODE(arg)[0];
+		else
+			return converterr("char < 256", arg, msgbuf, bufsize);
+		break;
+	}
+	
+	case 'C': {/* unicode char */
 		int *p = va_arg(*p_va, int *);
 		if (PyString_Check(arg) && PyString_Size(arg) == 1)
 			*p = PyString_AS_STRING(arg)[0];

Python/modsupport.c

@@ -384,6 +384,12 @@ do_mkvalue(const char **p_format, va_list *p_va, int flags)
 #endif /* WITHOUT_COMPLEX */
 
 		case 'c':
+		{
+			char p[1];
+			p[0] = (char)va_arg(*p_va, int);
+			return PyString_FromStringAndSize(p, 1);
+		}
+		case 'C':
 		{
 			int i = va_arg(*p_va, int);
 			Py_UNICODE c;