Three patches from issue #1047, by Amaury Forgeot d'Arc:

1/ getargs.diff adds the 'Z' and 'Z#' format specifiers for
PyArg_ParseTuple. They mimic z and z# for unicode strings, by accepting
a Unicode or None (in which case the Py_UNICODE* pointer is set to
NULL). With doc and tests.

2/ subprocess.diff converts file PC/_subprocess.c to unicode. We use the
Unicode version of the win32 api (and Z conversion from previous patch)

3/ stdout.diff: sys.stdout must not convert the line endings, Windows
already does it.
Without this patch, when redirecting the output of python, the file
contains \r\r\n for each line. (test_subprocess did catch this)

However, I (GvR) removed the change to _fileio.c (included in the
patches) that prevents closing file descripors < 3 from being closed;
I think that needs to be solved in a different way.

Doc/c-api/utilities.rst

@@ -484,6 +484,13 @@ variable(s) whose address should be passed.
    by interpreting their read-buffer pointer as pointer to a :ctype:`Py_UNICODE`
    array.
 
+``Z`` (Unicode or ``None``) [Py_UNICODE \*]
+   Like ``s``, but the Python object may also be ``None``, in which case the C
+   pointer is set to *NULL*.
+
+``Z#`` (Unicode or ``None``) [Py_UNICODE \*, int]
+   This is to ``u#`` as ``Z`` is to ``u``.
+
 ``es`` (string, Unicode object or character buffer compatible object) [const char \*encoding, char \*\*buffer]
    This variant on ``s`` is used for encoding Unicode and objects convertible to
    Unicode into a character buffer. It only works for encoded data without embedded

Lib/site.py

@@ -414,9 +414,9 @@ class open:
         def __new__(cls, *args, **kwds):
             return io.open(*args, **kwds)
     __builtin__.open = open
-    sys.__stdin__ = sys.stdin = io.open(0, "r")
-    sys.__stdout__ = sys.stdout = io.open(1, "w")
-    sys.__stderr__ = sys.stderr = io.open(2, "w")
+    sys.__stdin__ = sys.stdin = io.open(0, "r", newline='\n')
+    sys.__stdout__ = sys.stdout = io.open(1, "w", newline='\n')
+    sys.__stderr__ = sys.stderr = io.open(2, "w", newline='\n')
 
 
 def main():

Modules/_testcapimodule.c

@@ -497,6 +497,59 @@ test_u_code(PyObject *self)
 	return Py_None;
 }
 
+/* Test Z and Z# codes for PyArg_ParseTuple */
+static PyObject *
+test_Z_code(PyObject *self)
+{
+	PyObject *tuple, *obj;
+	Py_UNICODE *value1, *value2;
+	int len1, len2;
+
+        tuple = PyTuple_New(2);
+        if (tuple == NULL)
+        	return NULL;
+
+	obj = PyUnicode_FromString("test");
+	PyTuple_SET_ITEM(tuple, 0, obj);
+	Py_INCREF(Py_None);
+	PyTuple_SET_ITEM(tuple, 1, Py_None);
+
+	/* swap values on purpose */
+        value1 = NULL;
+	value2 = PyUnicode_AS_UNICODE(obj);
+
+	/* Test Z for both values */
+        if (PyArg_ParseTuple(tuple, "ZZ:test_Z_code", &value1, &value2) < 0)
+		return NULL;
+        if (value1 != PyUnicode_AS_UNICODE(obj))
+        	return raiseTestError("test_Z_code",
+			"Z code returned wrong value for 'test'");
+        if (value2 != NULL)
+        	return raiseTestError("test_Z_code",
+			"Z code returned wrong value for None");
+
+        value1 = NULL;
+	value2 = PyUnicode_AS_UNICODE(obj);
+	len1 = -1;
+	len2 = -1;
+
+	/* Test Z# for both values */
+        if (PyArg_ParseTuple(tuple, "Z#Z#:test_Z_code", &value1, &len1, 
+			     &value2, &len2) < 0)
+        	return NULL;
+        if (value1 != PyUnicode_AS_UNICODE(obj) ||
+	    len1 != PyUnicode_GET_SIZE(obj))
+        	return raiseTestError("test_Z_code",
+			"Z# code returned wrong values for 'test'");
+        if (value2 != NULL ||
+	    len2 != 0)
+        	return raiseTestError("test_Z_code",
+			"Z# code returned wrong values for None'");
+
+	Py_DECREF(tuple);
+	Py_RETURN_NONE;
+}
+
 static PyObject *
 codec_incrementalencoder(PyObject *self, PyObject *args)
 {
@@ -862,6 +915,7 @@ static PyMethodDef TestMethods[] = {
 	 (PyCFunction)codec_incrementaldecoder,	 METH_VARARGS},
 #endif
 	{"test_u_code",		(PyCFunction)test_u_code,	 METH_NOARGS},
+	{"test_Z_code",		(PyCFunction)test_Z_code,	 METH_NOARGS},
 #ifdef WITH_THREAD
 	{"_test_thread_state",  test_thread_state, 		 METH_VARARGS},
 #endif

PC/_subprocess.c

@@ -35,9 +35,6 @@
 /* Licensed to PSF under a Contributor Agreement. */
 /* See http://www.python.org/2.4/license for licensing details. */
 
-/* TODO: handle unicode command lines? */
-/* TODO: handle unicode environment? */
-
 #include "Python.h"
 
 #define WINDOWS_LEAN_AND_MEAN
@@ -272,7 +269,7 @@ gethandle(PyObject* obj, char* name)
 		PyErr_Clear(); /* FIXME: propagate error? */
 		return NULL;
 	}
-	if (Py_Type(&value) != &sp_handle_type)
+	if (Py_Type(value) != &sp_handle_type)
 		ret = NULL;
 	else
 		ret = value->handle;
@@ -287,7 +284,7 @@ getenvironment(PyObject* environment)
 	PyObject* out = NULL;
 	PyObject* keys;
 	PyObject* values;
-	char* p;
+	Py_UNICODE* p;
 
 	/* convert environment dictionary to windows enviroment string */
 	if (! PyMapping_Check(environment)) {
@@ -303,42 +300,42 @@ getenvironment(PyObject* environment)
 	if (!keys || !values)
 		goto error;
 
-	out = PyString_FromStringAndSize(NULL, 2048);
+	out = PyUnicode_FromUnicode(NULL, 2048);
 	if (! out)
 		goto error;
 
-	p = PyString_AS_STRING(out);
+	p = PyUnicode_AS_UNICODE(out);
 
 	for (i = 0; i < envsize; i++) {
 		int ksize, vsize, totalsize;
 		PyObject* key = PyList_GET_ITEM(keys, i);
 		PyObject* value = PyList_GET_ITEM(values, i);
 
-		if (! PyString_Check(key) || ! PyString_Check(value)) {
+		if (! PyUnicode_Check(key) || ! PyUnicode_Check(value)) {
 			PyErr_SetString(PyExc_TypeError,
 				"environment can only contain strings");
 			goto error;
 		}
-		ksize = PyString_GET_SIZE(key);
-		vsize = PyString_GET_SIZE(value);
-		totalsize = (p - PyString_AS_STRING(out)) + ksize + 1 +
+		ksize = PyUnicode_GET_SIZE(key);
+		vsize = PyUnicode_GET_SIZE(value);
+		totalsize = (p - PyUnicode_AS_UNICODE(out)) + ksize + 1 +
 							     vsize + 1 + 1;
-		if (totalsize > PyString_GET_SIZE(out)) {
-			int offset = p - PyString_AS_STRING(out);
-			_PyString_Resize(&out, totalsize + 1024);
-			p = PyString_AS_STRING(out) + offset;
+		if (totalsize > PyUnicode_GET_SIZE(out)) {
+			int offset = p - PyUnicode_AS_UNICODE(out);
+			PyUnicode_Resize(&out, totalsize + 1024);
+			p = PyUnicode_AS_UNICODE(out) + offset;
 		}
-		memcpy(p, PyString_AS_STRING(key), ksize);
+		Py_UNICODE_COPY(p, PyUnicode_AS_UNICODE(key), ksize);
 		p += ksize;
 		*p++ = '=';
-		memcpy(p, PyString_AS_STRING(value), vsize);
+		Py_UNICODE_COPY(p, PyUnicode_AS_UNICODE(value), vsize);
 		p += vsize;
 		*p++ = '\0';
 	}
 
 	/* add trailing null byte */
 	*p++ = '\0';
-	_PyString_Resize(&out, p - PyString_AS_STRING(out));
+	PyUnicode_Resize(&out, p - PyUnicode_AS_UNICODE(out));
 
 	/* PyObject_Print(out, stdout, 0); */
 
@@ -359,20 +356,20 @@ sp_CreateProcess(PyObject* self, PyObject* args)
 {
 	BOOL result;
 	PROCESS_INFORMATION pi;
-	STARTUPINFO si;
+	STARTUPINFOW si;
 	PyObject* environment;
 
-	char* application_name;
-	char* command_line;
+	Py_UNICODE* application_name;
+	Py_UNICODE* command_line;
 	PyObject* process_attributes; /* ignored */
 	PyObject* thread_attributes; /* ignored */
 	int inherit_handles;
 	int creation_flags;
 	PyObject* env_mapping;
-	char* current_directory;
+	Py_UNICODE* current_directory;
 	PyObject* startup_info;
 
-	if (! PyArg_ParseTuple(args, "zzOOiiOzO:CreateProcess",
+	if (! PyArg_ParseTuple(args, "ZZOOiiOZO:CreateProcess",
 			       &application_name,
 			       &command_line,
 			       &process_attributes,
@@ -406,13 +403,13 @@ sp_CreateProcess(PyObject* self, PyObject* args)
 	}
 
 	Py_BEGIN_ALLOW_THREADS
-	result = CreateProcess(application_name,
+	result = CreateProcessW(application_name,
 			       command_line,
 			       NULL,
 			       NULL,
 			       inherit_handles,
-			       creation_flags,
-			       environment ? PyString_AS_STRING(environment) : NULL,
+			       creation_flags | CREATE_UNICODE_ENVIRONMENT,
+			       environment ? PyUnicode_AS_UNICODE(environment) : NULL,
 			       current_directory,
 			       &si,
 			       &pi);
@@ -504,18 +501,18 @@ sp_GetModuleFileName(PyObject* self, PyObject* args)
 {
 	BOOL result;
 	long module;
-	TCHAR filename[MAX_PATH];
+	WCHAR filename[MAX_PATH];
 
 	if (! PyArg_ParseTuple(args, "l:GetModuleFileName", &module))
 		return NULL;
 
-	result = GetModuleFileName((HMODULE)module, filename, MAX_PATH);
+	result = GetModuleFileNameW((HMODULE)module, filename, MAX_PATH);
 	filename[MAX_PATH-1] = '\0';
 
 	if (! result)
 		return PyErr_SetFromWindowsErr(GetLastError());
 
-	return PyString_FromString(filename);
+	return PyUnicode_FromUnicode(filename, Py_UNICODE_strlen(filename));
 }
 
 static PyMethodDef sp_functions[] = {

Python/getargs.c

@@ -921,6 +921,34 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
 		break;
 	}
 	
+	case 'Z': {/* unicode, may be NULL (None) */
+		if (*format == '#') { /* any buffer-like object */
+			Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);
+			FETCH_SIZE;
+			
+			if (arg == Py_None) {
+				*p = 0;
+				STORE_SIZE(0);
+			}
+			else if (PyUnicode_Check(arg)) {
+				*p = PyUnicode_AS_UNICODE(arg);
+				STORE_SIZE(PyUnicode_GET_SIZE(arg));
+			}
+			format++;
+		} else {
+			Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);
+			
+			if (arg == Py_None)
+				*p = 0;
+			else if (PyUnicode_Check(arg))
+				*p = PyUnicode_AS_UNICODE(arg);
+			else
+				return converterr("string or None", 
+						  arg, msgbuf, bufsize);
+		}
+		break;
+	}
+	
 	case 'e': {/* encoded string */
 		char **buffer;
 		const char *encoding;