osutil.c: Support for py3k added.

This patch adds support for py3k in osutil.c. This is accomplished by including
a header file responsible for abstracting the API differences between python 2
and python 3.

listdir_stat_type is also changed in the following way: A previous call to
PyObject_HEAD_INIT is substituted to a call to PyVarObject_HEAD_INIT, which
makes the object buildable in both python 2.x and 3.x without weird warnings.

After testing on windows, some modifications were also made in the posixfile
function, as it calls PyFile_FromFile and PyFile_SetBufSize, which are gone in
py3k. In py3k the PyFile_* API is, actually a wrapper over the io module, and
code has been adapted accordingly to fit py3k.

mercurial/osutil.c

@@ -23,6 +23,8
 #include <unistd.h>
 #endif
 
+#include "util.h"
+
 /* some platforms lack the PATH_MAX definition (eg. GNU/Hurd) */
 #ifndef PATH_MAX
 #define PATH_MAX 4096
@@ -95,8 +97,7 static void listdir_stat_dealloc(PyObjec
 }
 
 static PyTypeObject listdir_stat_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                         /*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"osutil.stat",             /*tp_name*/
 	sizeof(struct listdir_stat), /*tp_basicsize*/
 	0,                         /*tp_itemsize*/
@@ -392,7 +393,7 static PyObject *listdir(PyObject *self,
 	wantstat = statobj && PyObject_IsTrue(statobj);
 
 	if (skipobj && skipobj != Py_None) {
-		skip = PyString_AsString(skipobj);
+		skip = PyBytes_AsString(skipobj);
 		if (!skip)
 			return NULL;
 	}
@@ -486,12 +487,13 static PyObject *posixfile(PyObject *sel
 	}
 
 	fd = _open_osfhandle((intptr_t)handle, flags);
+
 	if (fd == -1) {
 		CloseHandle(handle);
 		PyErr_SetFromErrnoWithFilename(PyExc_IOError, name);
 		goto bail;
 	}
-
+#ifndef IS_PY3K
 	fp = _fdopen(fd, fpmode);
 	if (fp == NULL) {
 		_close(fd);
@@ -506,6 +508,11 static PyObject *posixfile(PyObject *sel
 	}
 
 	PyFile_SetBufSize(file_obj, bufsize);
+#else
+	file_obj = PyFile_FromFd(fd, name, mode, bufsize, NULL, NULL, NULL, 1);
+	if (file_obj == NULL)
+		goto bail;
+#endif
 bail:
 	PyMem_Free(name);
 	return file_obj;
@@ -525,6 +532,23 static PyMethodDef methods[] = {
 	{NULL, NULL}
 };
 
+#ifdef IS_PY3K
+static struct PyModuleDef osutil_module = {
+	PyModuleDef_HEAD_INIT,
+	"osutil",
+	osutil_doc,
+	-1,
+	methods
+};
+
+PyMODINIT_FUNC PyInit_osutil(void)
+{
+	if (PyType_Ready(&listdir_stat_type) < 0)
+		return NULL;
+
+	return PyModule_Create(&osutil_module);
+}
+#else
 PyMODINIT_FUNC initosutil(void)
 {
 	if (PyType_Ready(&listdir_stat_type) == -1)
@@ -532,3 +556,4 PyMODINIT_FUNC initosutil(void)
 
 	Py_InitModule3("osutil", methods, osutil_doc);
 }
+#endif