add the gestalt module back as _gestalt

Modules/_gestalt.c

@@ -0,0 +1,72 @@
+/***********************************************************
+Copyright 1991-1997 by Stichting Mathematisch Centrum, Amsterdam,
+The Netherlands.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Macintosh Gestalt interface */
+
+#include "Python.h"
+
+#include <Carbon/Carbon.h>
+
+/* Convert a 4-char string object argument to an OSType value */
+static int
+convert_to_OSType(PyObject *v, OSType *pr)
+{
+    uint32_t tmp;
+    if (!PyUnicode_Check(v) || PyUnicode_GetSize(v) != 4) {
+        PyErr_SetString(PyExc_TypeError,
+			"OSType arg must be string of 4 chars");
+        return 0;
+    }
+    memcpy((char *)&tmp, PyUnicode_AsString(v), 4);
+    *pr = (OSType)ntohl(tmp);
+    return 1;
+}
+
+static PyObject *
+gestalt_gestalt(PyObject *self, PyObject *args)
+{
+    OSErr iErr;
+    OSType selector;
+    SInt32 response;
+    if (!PyArg_ParseTuple(args, "O&", convert_to_OSType, &selector))
+            return NULL;
+    iErr = Gestalt(selector, &response);
+    if (iErr != 0) {
+        PyErr_SetString(PyExc_OSError,
+                        "non-zero exit code!");
+        return NULL;
+    }
+    return PyLong_FromLong(response);
+}
+
+static struct PyMethodDef gestalt_methods[] = {
+    {"gestalt", gestalt_gestalt, METH_VARARGS},
+    {NULL, NULL} /* Sentinel */
+};
+
+void
+init_gestalt(void)
+{
+    Py_InitModule("_gestalt", gestalt_methods);
+}