Backport of several functions from Python 3.0 to 2.6 including PyUnicode_FromString, PyUnicode_Format and PyLong_From/AsSsize_t. The functions are partly required for the backport of the bytearray type and _fileio module. They should also make it easier to port C to 3.0.

First chapter of the Python 3.0 io framework back port: _fileio
The next step depends on a working bytearray type which itself depends on a backport of the nwe buffer API.

Include/longintrepr.h

@@ -24,11 +24,11 @@ typedef unsigned int wdigit; /* digit widened to parameter size */
 typedef unsigned BASE_TWODIGITS_TYPE twodigits;
 typedef BASE_TWODIGITS_TYPE stwodigits; /* signed variant of twodigits */
 
-#define SHIFT	15
+#define PyLong_SHIFT    15
-#define BASE	((digit)1 << SHIFT)
+#define PyLong_BASE     ((digit)1 << PyLong_SHIFT)
-#define MASK	((int)(BASE - 1))
+#define PyLong_MASK     ((int)(PyLong_BASE - 1))
 
-#if SHIFT % 5 != 0
+#if PyLong_SHIFT % 5 != 0
 #error "longobject.c requires that SHIFT be divisible by 5"
 #endif
 

Include/longobject.h

@@ -18,14 +18,17 @@ PyAPI_DATA(PyTypeObject) PyLong_Type;
 PyAPI_FUNC(PyObject *) PyLong_FromLong(long);
 PyAPI_FUNC(PyObject *) PyLong_FromUnsignedLong(unsigned long);
 PyAPI_FUNC(PyObject *) PyLong_FromDouble(double);
+PyAPI_FUNC(PyObject *) PyLong_FromSize_t(size_t);
+PyAPI_FUNC(PyObject *) PyLong_FromSsize_t(Py_ssize_t);
 PyAPI_FUNC(long) PyLong_AsLong(PyObject *);
 PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLong(PyObject *);
 PyAPI_FUNC(unsigned long) PyLong_AsUnsignedLongMask(PyObject *);
+PyAPI_FUNC(Py_ssize_t) PyLong_AsSsize_t(PyObject *);
 
 /* For use by intobject.c only */
-PyAPI_FUNC(Py_ssize_t) _PyLong_AsSsize_t(PyObject *);
+#define _PyLong_AsSsize_t PyLong_AsSsize_t
-PyAPI_FUNC(PyObject *) _PyLong_FromSize_t(size_t);
+#define _PyLong_FromSize_t PyLong_FromSize_t
-PyAPI_FUNC(PyObject *) _PyLong_FromSsize_t(Py_ssize_t);
+#define _PyLong_FromSsize_t PyLong_FromSsize_t
 PyAPI_DATA(int) _PyLong_DigitValue[256];
 
 /* _PyLong_AsScaledDouble returns a double x and an exponent e such that

Include/unicodeobject.h

@@ -183,6 +183,10 @@ typedef PY_UNICODE_TYPE Py_UNICODE;
 # define PyUnicode_FromObject PyUnicodeUCS2_FromObject
 # define PyUnicode_FromOrdinal PyUnicodeUCS2_FromOrdinal
 # define PyUnicode_FromUnicode PyUnicodeUCS2_FromUnicode
+# define PyUnicode_FromString PyUnicodeUCS2_FromString
+# define PyUnicode_FromStringAndSize PyUnicodeUCS2_FromStringAndSize
+# define PyUnicode_FromFormatV PyUnicodeUCS2_FromFormatV
+# define PyUnicode_FromFormat PyUnicodeUCS2_FromFormat
 # define PyUnicode_FromWideChar PyUnicodeUCS2_FromWideChar
 # define PyUnicode_GetDefaultEncoding PyUnicodeUCS2_GetDefaultEncoding
 # define PyUnicode_GetMax PyUnicodeUCS2_GetMax
@@ -265,6 +269,10 @@ typedef PY_UNICODE_TYPE Py_UNICODE;
 # define PyUnicode_FromObject PyUnicodeUCS4_FromObject
 # define PyUnicode_FromOrdinal PyUnicodeUCS4_FromOrdinal
 # define PyUnicode_FromUnicode PyUnicodeUCS4_FromUnicode
+# define PyUnicode_FromString PyUnicodeUCS4_FromString
+# define PyUnicode_FromStringAndSize PyUnicodeUCS4_FromStringAndSize
+# define PyUnicode_FromFormatV PyUnicodeUCS4_FromFormatV
+# define PyUnicode_FromFormat PyUnicodeUCS4_FromFormat
 # define PyUnicode_FromWideChar PyUnicodeUCS4_FromWideChar
 # define PyUnicode_GetDefaultEncoding PyUnicodeUCS4_GetDefaultEncoding
 # define PyUnicode_GetMax PyUnicodeUCS4_GetMax
@@ -442,6 +450,18 @@ PyAPI_FUNC(PyObject*) PyUnicode_FromUnicode(
     Py_ssize_t size             /* size of buffer */
     );
 
+/* Similar to PyUnicode_FromUnicode(), but u points to Latin-1 encoded bytes */
+PyAPI_FUNC(PyObject*) PyUnicode_FromStringAndSize(
+    const char *u,        /* char buffer */
+    Py_ssize_t size       /* size of buffer */
+    );
+
+/* Similar to PyUnicode_FromUnicode(), but u points to null-terminated
+   Latin-1 encoded bytes */
+PyAPI_FUNC(PyObject*) PyUnicode_FromString(
+    const char *u        /* string */
+    );
+
 /* Return a read-only pointer to the Unicode object's internal
    Py_UNICODE buffer. */
 
@@ -517,6 +537,9 @@ PyAPI_FUNC(PyObject*) PyUnicode_FromObject(
     register PyObject *obj 	/* Object */
     );
 
+PyAPI_FUNC(PyObject *) PyUnicode_FromFormatV(const char*, va_list);
+PyAPI_FUNC(PyObject *) PyUnicode_FromFormat(const char*, ...);
+
 /* --- wchar_t support for platforms which support it --------------------- */
 
 #ifdef HAVE_WCHAR_H

Misc/NEWS

@@ -1,4 +1,4 @@
-+++++++++++
++++++++++++
 Python News
 +++++++++++
 
@@ -12,6 +12,10 @@ What's New in Python 2.6 alpha 1?
 Core and builtins
 -----------------
 
+- Backport of PyUnicode_FromString(), _FromStringAndSize(), _Format and
+  _FormatV from Python 3.0. Made PyLong_AsSsize_t and PyLong_FromSsize_t
+  public functions.
+
 - Issue #1920: "while 0" statements were completely removed by the compiler,
   even in the presence of an "else" clause, which is supposed to be run when 
   the condition is false. Now the compiler correctly emits bytecode for the
@@ -1102,6 +1106,8 @@ Library
 Extension Modules
 -----------------
 
+- Backport of _fileio module from Python 3.0.
+
 - #1087741: mmap.mmap is now a class, not a factory function. It is also
   subclassable now.
 

Modules/_fileio.c

@@ -0,0 +1,927 @@
+/* Author: Daniel Stutzbach */
+
+#define PY_SSIZE_T_CLEAN
+#include "Python.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stddef.h> /* For offsetof */
+
+/*
+ * Known likely problems:
+ *
+ * - Files larger then 2**32-1
+ * - Files with unicode filenames
+ * - Passing numbers greater than 2**32-1 when an integer is expected
+ * - Making it work on Windows and other oddball platforms
+ *
+ * To Do:
+ *
+ * - autoconfify header file inclusion
+ */
+
+#ifdef MS_WINDOWS
+/* can simulate truncate with Win32 API functions; see file_truncate */
+#define HAVE_FTRUNCATE
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+typedef struct {
+	PyObject_HEAD
+	int fd;
+	unsigned readable : 1;
+	unsigned writable : 1;
+	int seekable : 2; /* -1 means unknown */
+	int closefd : 1;
+	PyObject *weakreflist;
+} PyFileIOObject;
+
+PyTypeObject PyFileIO_Type;
+
+#define PyFileIO_Check(op) (PyObject_TypeCheck((op), &PyFileIO_Type))
+
+/* Returns 0 on success, errno (which is < 0) on failure. */
+static int
+internal_close(PyFileIOObject *self)
+{
+	int save_errno = 0;
+	if (self->fd >= 0) {
+		int fd = self->fd;
+		self->fd = -1;
+		Py_BEGIN_ALLOW_THREADS
+		if (close(fd) < 0)
+			save_errno = errno;
+		Py_END_ALLOW_THREADS
+	}
+	return save_errno;
+}
+
+static PyObject *
+fileio_close(PyFileIOObject *self)
+{
+	if (!self->closefd) {
+		if (PyErr_WarnEx(PyExc_RuntimeWarning,
+				 "Trying to close unclosable fd!", 3) < 0) {
+			return NULL;
+		}
+		Py_RETURN_NONE;
+	}
+	errno = internal_close(self);
+	if (errno < 0) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_RETURN_NONE;
+}
+
+static PyObject *
+fileio_new(PyTypeObject *type, PyObject *args, PyObject *kews)
+{
+	PyFileIOObject *self;
+
+	assert(type != NULL && type->tp_alloc != NULL);
+
+	self = (PyFileIOObject *) type->tp_alloc(type, 0);
+	if (self != NULL) {
+		self->fd = -1;
+		self->weakreflist = NULL;
+	}
+
+	return (PyObject *) self;
+}
+
+/* On Unix, open will succeed for directories.
+   In Python, there should be no file objects referring to
+   directories, so we need a check.  */
+
+static int
+dircheck(PyFileIOObject* self)
+{
+#if defined(HAVE_FSTAT) && defined(S_IFDIR) && defined(EISDIR)
+	struct stat buf;
+	if (self->fd < 0)
+		return 0;
+	if (fstat(self->fd, &buf) == 0 && S_ISDIR(buf.st_mode)) {
+#ifdef HAVE_STRERROR
+		char *msg = strerror(EISDIR);
+#else
+		char *msg = "Is a directory";
+#endif
+		PyObject *exc;
+		internal_close(self);
+
+		exc = PyObject_CallFunction(PyExc_IOError, "(is)",
+					    EISDIR, msg);
+		PyErr_SetObject(PyExc_IOError, exc);
+		Py_XDECREF(exc);
+		return -1;
+	}
+#endif
+	return 0;
+}
+
+
+static int
+fileio_init(PyObject *oself, PyObject *args, PyObject *kwds)
+{
+	PyFileIOObject *self = (PyFileIOObject *) oself;
+	static char *kwlist[] = {"file", "mode", "closefd", NULL};
+	char *name = NULL;
+	char *mode = "r";
+	char *s;
+#ifdef MS_WINDOWS
+	Py_UNICODE *widename = NULL;
+#endif
+	int ret = 0;
+	int rwa = 0, plus = 0, append = 0;
+	int flags = 0;
+	int fd = -1;
+	int closefd = 1;
+
+	assert(PyFileIO_Check(oself));
+	if (self->fd >= 0) {
+		/* Have to close the existing file first. */
+		if (internal_close(self) < 0)
+			return -1;
+	}
+
+	if (PyArg_ParseTupleAndKeywords(args, kwds, "i|si:fileio",
+					kwlist, &fd, &mode, &closefd)) {
+		if (fd < 0) {
+			PyErr_SetString(PyExc_ValueError,
+					"Negative filedescriptor");
+			return -1;
+		}
+	}
+	else {
+		PyErr_Clear();
+
+#ifdef Py_WIN_WIDE_FILENAMES
+	    if (GetVersion() < 0x80000000) {
+		/* On NT, so wide API available */
+		PyObject *po;
+		if (PyArg_ParseTupleAndKeywords(args, kwds, "U|si:fileio",
+						kwlist, &po, &mode, &closefd)
+						) {
+			widename = PyUnicode_AS_UNICODE(po);
+		} else {
+			/* Drop the argument parsing error as narrow
+			   strings are also valid. */
+			PyErr_Clear();
+		}
+	    }
+	    if (widename == NULL)
+#endif
+	    {
+		if (!PyArg_ParseTupleAndKeywords(args, kwds, "et|si:fileio",
+						 kwlist,
+						 Py_FileSystemDefaultEncoding,
+						 &name, &mode, &closefd))
+			goto error;
+	    }
+	}
+
+	self->readable = self->writable = 0;
+	self->seekable = -1;
+	s = mode;
+	while (*s) {
+		switch (*s++) {
+		case 'r':
+			if (rwa) {
+			bad_mode:
+				PyErr_SetString(PyExc_ValueError,
+						"Must have exactly one of read/write/append mode");
+				goto error;
+			}
+			rwa = 1;
+			self->readable = 1;
+			break;
+		case 'w':
+			if (rwa)
+				goto bad_mode;
+			rwa = 1;
+			self->writable = 1;
+			flags |= O_CREAT | O_TRUNC;
+			break;
+		case 'a':
+			if (rwa)
+				goto bad_mode;
+			rwa = 1;
+			self->writable = 1;
+			flags |= O_CREAT;
+			append = 1;
+			break;
+		case '+':
+			if (plus)
+				goto bad_mode;
+			self->readable = self->writable = 1;
+			plus = 1;
+			break;
+		default:
+			PyErr_Format(PyExc_ValueError,
+				     "invalid mode: %.200s", mode);
+			goto error;
+		}
+	}
+
+	if (!rwa)
+		goto bad_mode;
+
+	if (self->readable && self->writable)
+		flags |= O_RDWR;
+	else if (self->readable)
+		flags |= O_RDONLY;
+	else
+		flags |= O_WRONLY;
+
+#ifdef O_BINARY
+	flags |= O_BINARY;
+#endif
+
+#ifdef O_APPEND
+	if (append)
+		flags |= O_APPEND;
+#endif
+
+	if (fd >= 0) {
+		self->fd = fd;
+		self->closefd = closefd;
+	}
+	else {
+		self->closefd = 1;
+		if (!closefd) {
+			PyErr_SetString(PyExc_ValueError,
+                            "Cannot use closefd=True with file name");
+			goto error;
+		}
+
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+#ifdef MS_WINDOWS
+		if (widename != NULL)
+			self->fd = _wopen(widename, flags, 0666);
+		else
+#endif
+			self->fd = open(name, flags, 0666);
+		Py_END_ALLOW_THREADS
+		if (self->fd < 0 || dircheck(self) < 0) {
+#ifdef MS_WINDOWS
+			PyErr_SetFromErrnoWithUnicodeFilename(PyExc_IOError, widename);
+#else
+			PyErr_SetFromErrnoWithFilename(PyExc_IOError, name);
+#endif
+			goto error;
+		}
+	}
+
+	goto done;
+
+ error:
+	ret = -1;
+
+ done:
+	PyMem_Free(name);
+	return ret;
+}
+
+static void
+fileio_dealloc(PyFileIOObject *self)
+{
+	if (self->weakreflist != NULL)
+		PyObject_ClearWeakRefs((PyObject *) self);
+
+	if (self->fd >= 0 && self->closefd) {
+		errno = internal_close(self);
+		if (errno < 0) {
+#ifdef HAVE_STRERROR
+			PySys_WriteStderr("close failed: [Errno %d] %s\n",
+                                          errno, strerror(errno));
+#else
+			PySys_WriteStderr("close failed: [Errno %d]\n", errno);
+#endif
+		}
+	}
+
+	Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static PyObject *
+err_closed(void)
+{
+	PyErr_SetString(PyExc_ValueError, "I/O operation on closed file");
+	return NULL;
+}
+
+static PyObject *
+err_mode(char *action)
+{
+	PyErr_Format(PyExc_ValueError, "File not open for %s", action);
+	return NULL;
+}
+
+static PyObject *
+fileio_fileno(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	return PyInt_FromLong((long) self->fd);
+}
+
+static PyObject *
+fileio_readable(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	return PyBool_FromLong((long) self->readable);
+}
+
+static PyObject *
+fileio_writable(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	return PyBool_FromLong((long) self->writable);
+}
+
+static PyObject *
+fileio_seekable(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	if (self->seekable < 0) {
+		int ret;
+		Py_BEGIN_ALLOW_THREADS
+		ret = lseek(self->fd, 0, SEEK_CUR);
+		Py_END_ALLOW_THREADS
+		if (ret < 0)
+			self->seekable = 0;
+		else
+			self->seekable = 1;
+	}
+	return PyBool_FromLong((long) self->seekable);
+}
+
+static PyObject *
+fileio_readinto(PyFileIOObject *self, PyObject *args)
+{
+	char *ptr;
+	Py_ssize_t n;
+
+	if (self->fd < 0)
+		return err_closed();
+	if (!self->readable)
+		return err_mode("reading");
+
+	if (!PyArg_ParseTuple(args, "w#", &ptr, &n))
+		return NULL;
+
+	Py_BEGIN_ALLOW_THREADS
+	errno = 0;
+	n = read(self->fd, ptr, n);
+	Py_END_ALLOW_THREADS
+	if (n < 0) {
+		if (errno == EAGAIN)
+			Py_RETURN_NONE;
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return PyLong_FromSsize_t(n);
+}
+
+#define DEFAULT_BUFFER_SIZE (8*1024)
+
+static PyObject *
+fileio_readall(PyFileIOObject *self)
+{
+	PyObject *result;
+	Py_ssize_t total = 0;
+	int n;
+
+	result = PyString_FromStringAndSize(NULL, DEFAULT_BUFFER_SIZE);
+	if (result == NULL)
+		return NULL;
+
+	while (1) {
+		Py_ssize_t newsize = total + DEFAULT_BUFFER_SIZE;
+		if (PyString_GET_SIZE(result) < newsize) {
+			if (_PyString_Resize(&result, newsize) < 0) {
+				if (total == 0) {
+					Py_DECREF(result);
+					return NULL;
+				}
+				PyErr_Clear();
+				break;
+			}
+		}
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+		n = read(self->fd,
+			 PyString_AS_STRING(result) + total,
+			 newsize - total);
+		Py_END_ALLOW_THREADS
+		if (n == 0)
+			break;
+		if (n < 0) {
+			if (total > 0)
+				break;
+			if (errno == EAGAIN) {
+				Py_DECREF(result);
+				Py_RETURN_NONE;
+			}
+			Py_DECREF(result);
+			PyErr_SetFromErrno(PyExc_IOError);
+			return NULL;
+		}
+		total += n;
+	}
+
+	if (PyString_GET_SIZE(result) > total) {
+		if (_PyString_Resize(&result, total) < 0) {
+			/* This should never happen, but just in case */
+			Py_DECREF(result);
+			return NULL;
+		}
+	}
+	return result;
+}
+
+static PyObject *
+fileio_read(PyFileIOObject *self, PyObject *args)
+{
+	char *ptr;
+	Py_ssize_t n;
+	Py_ssize_t size = -1;
+	PyObject *bytes;
+
+	if (self->fd < 0)
+		return err_closed();
+	if (!self->readable)
+		return err_mode("reading");
+
+	if (!PyArg_ParseTuple(args, "|n", &size))
+		return NULL;
+
+        if (size < 0) {
+		return fileio_readall(self);
+	}
+
+	bytes = PyString_FromStringAndSize(NULL, size);
+	if (bytes == NULL)
+		return NULL;
+	ptr = PyString_AS_STRING(bytes);
+
+	Py_BEGIN_ALLOW_THREADS
+	errno = 0;
+	n = read(self->fd, ptr, size);
+	Py_END_ALLOW_THREADS
+
+	if (n < 0) {
+		if (errno == EAGAIN)
+			Py_RETURN_NONE;
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	if (n != size) {
+		if (_PyString_Resize(&bytes, n) < 0) {
+			Py_DECREF(bytes);
+			return NULL;
+		}
+	}
+
+	return (PyObject *) bytes;
+}
+
+static PyObject *
+fileio_write(PyFileIOObject *self, PyObject *args)
+{
+	Py_ssize_t n;
+	char *ptr;
+
+	if (self->fd < 0)
+		return err_closed();
+	if (!self->writable)
+		return err_mode("writing");
+
+	if (!PyArg_ParseTuple(args, "s#", &ptr, &n))
+		return NULL;
+
+	Py_BEGIN_ALLOW_THREADS
+	errno = 0;
+	n = write(self->fd, ptr, n);
+	Py_END_ALLOW_THREADS
+
+	if (n < 0) {
+		if (errno == EAGAIN)
+			Py_RETURN_NONE;
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return PyLong_FromSsize_t(n);
+}
+
+/* XXX Windows support below is likely incomplete */
+
+#if defined(MS_WIN64) || defined(MS_WINDOWS)
+typedef PY_LONG_LONG Py_off_t;
+#else
+typedef off_t Py_off_t;
+#endif
+
+/* Cribbed from posix_lseek() */
+static PyObject *
+portable_lseek(int fd, PyObject *posobj, int whence)
+{
+	Py_off_t pos, res;
+
+#ifdef SEEK_SET
+	/* Turn 0, 1, 2 into SEEK_{SET,CUR,END} */
+	switch (whence) {
+#if SEEK_SET != 0
+	case 0: whence = SEEK_SET; break;
+#endif
+#if SEEK_CUR != 1
+	case 1: whence = SEEK_CUR; break;
+#endif
+#if SEEL_END != 2
+	case 2: whence = SEEK_END; break;
+#endif
+	}
+#endif /* SEEK_SET */
+
+	if (posobj == NULL)
+		pos = 0;
+	else {
+		if(PyFloat_Check(posobj)) {
+			PyErr_SetString(PyExc_TypeError, "an integer is required");
+			return NULL;
+		}
+#if !defined(HAVE_LARGEFILE_SUPPORT)
+		pos = PyLong_AsLong(posobj);
+#else
+		pos = PyLong_Check(posobj) ?
+			PyLong_AsLongLong(posobj) : PyLong_AsLong(posobj);
+#endif
+		if (PyErr_Occurred())
+			return NULL;
+	}
+
+	Py_BEGIN_ALLOW_THREADS
+#if defined(MS_WIN64) || defined(MS_WINDOWS)
+	res = _lseeki64(fd, pos, whence);
+#else
+	res = lseek(fd, pos, whence);
+#endif
+	Py_END_ALLOW_THREADS
+	if (res < 0)
+		return PyErr_SetFromErrno(PyExc_IOError);
+
+#if !defined(HAVE_LARGEFILE_SUPPORT)
+	return PyLong_FromLong(res);
+#else
+	return PyLong_FromLongLong(res);
+#endif
+}
+
+static PyObject *
+fileio_seek(PyFileIOObject *self, PyObject *args)
+{
+	PyObject *posobj;
+	int whence = 0;
+
+	if (self->fd < 0)
+		return err_closed();
+
+	if (!PyArg_ParseTuple(args, "O|i", &posobj, &whence))
+		return NULL;
+
+	return portable_lseek(self->fd, posobj, whence);
+}
+
+static PyObject *
+fileio_tell(PyFileIOObject *self, PyObject *args)
+{
+	if (self->fd < 0)
+		return err_closed();
+
+	return portable_lseek(self->fd, NULL, 1);
+}
+
+#ifdef HAVE_FTRUNCATE
+static PyObject *
+fileio_truncate(PyFileIOObject *self, PyObject *args)
+{
+	PyObject *posobj = NULL;
+	Py_off_t pos;
+	int ret;
+	int fd;
+
+	fd = self->fd;
+	if (fd < 0)
+		return err_closed();
+	if (!self->writable)
+		return err_mode("writing");
+
+	if (!PyArg_ParseTuple(args, "|O", &posobj))
+		return NULL;
+
+	if (posobj == Py_None || posobj == NULL) {
+                posobj = portable_lseek(fd, NULL, 1);
+                if (posobj == NULL)
+                  return NULL;
+        }
+        else {
+		Py_INCREF(posobj);
+        }
+
+#if !defined(HAVE_LARGEFILE_SUPPORT)
+	pos = PyLong_AsLong(posobj);
+#else
+	pos = PyLong_Check(posobj) ?
+		PyLong_AsLongLong(posobj) : PyLong_AsLong(posobj);
+#endif
+	if (PyErr_Occurred()) {
+		Py_DECREF(posobj);
+		return NULL;
+	}
+
+#ifdef MS_WINDOWS
+	/* MS _chsize doesn't work if newsize doesn't fit in 32 bits,
+	   so don't even try using it. */
+	{
+		HANDLE hFile;
+		PyObject *pos2, *oldposobj;
+
+		/* store the current position */
+		oldposobj = portable_lseek(self->fd, NULL, 1);
+		if (oldposobj == NULL) {
+			Py_DECREF(posobj);
+			return NULL;
+		}
+
+		/* Have to move current pos to desired endpoint on Windows. */
+		errno = 0;
+		pos2 = portable_lseek(fd, posobj, SEEK_SET);
+		if (pos2 == NULL) {
+			Py_DECREF(posobj);
+			Py_DECREF(oldposobj);
+			return NULL;
+		}
+		Py_DECREF(pos2);
+
+		/* Truncate.  Note that this may grow the file! */
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+		hFile = (HANDLE)_get_osfhandle(fd);
+		ret = hFile == (HANDLE)-1;
+		if (ret == 0) {
+			ret = SetEndOfFile(hFile) == 0;
+			if (ret)
+				errno = EACCES;
+		}
+		Py_END_ALLOW_THREADS
+
+		if (ret == 0) {
+			/* Move to the previous position in the file */
+			pos2 = portable_lseek(fd, oldposobj, SEEK_SET);
+			if (pos2 == NULL) {
+				Py_DECREF(posobj);
+				Py_DECREF(oldposobj);
+				return NULL;
+			}
+		}
+		Py_DECREF(pos2);
+		Py_DECREF(oldposobj);
+	}
+#else
+	Py_BEGIN_ALLOW_THREADS
+	errno = 0;
+	ret = ftruncate(fd, pos);
+	Py_END_ALLOW_THREADS
+#endif /* !MS_WINDOWS */
+
+	if (ret != 0) {
+		Py_DECREF(posobj);
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return posobj;
+}
+#endif
+
+static char *
+mode_string(PyFileIOObject *self)
+{
+	if (self->readable) {
+		if (self->writable)
+			return "r+";
+		else
+			return "r";
+	}
+	else
+		return "w";
+}
+
+static PyObject *
+fileio_repr(PyFileIOObject *self)
+{
+        if (self->fd < 0)
+		return PyString_FromFormat("_fileio._FileIO(-1)");
+
+	return PyString_FromFormat("_fileio._FileIO(%d, '%s')",
+				   self->fd, mode_string(self));
+}
+
+static PyObject *
+fileio_isatty(PyFileIOObject *self)
+{
+	long res;
+
+	if (self->fd < 0)
+		return err_closed();
+	Py_BEGIN_ALLOW_THREADS
+	res = isatty(self->fd);
+	Py_END_ALLOW_THREADS
+	return PyBool_FromLong(res);
+}
+
+
+PyDoc_STRVAR(fileio_doc,
+"file(name: str[, mode: str]) -> file IO object\n"
+"\n"
+"Open a file.  The mode can be 'r', 'w' or 'a' for reading (default),\n"
+"writing or appending.	The file will be created if it doesn't exist\n"
+"when opened for writing or appending; it will be truncated when\n"
+"opened for writing.  Add a '+' to the mode to allow simultaneous\n"
+"reading and writing.");
+
+PyDoc_STRVAR(read_doc,
+"read(size: int) -> bytes.  read at most size bytes, returned as bytes.\n"
+"\n"
+"Only makes one system call, so less data may be returned than requested\n"
+"In non-blocking mode, returns None if no data is available.\n"
+"On end-of-file, returns ''.");
+
+PyDoc_STRVAR(readall_doc,
+"readall() -> bytes.  read all data from the file, returned as bytes.\n"
+"\n"
+"In non-blocking mode, returns as much as is immediately available,\n"
+"or None if no data is available.  On end-of-file, returns ''.");
+
+PyDoc_STRVAR(write_doc,
+"write(b: bytes) -> int.  Write bytes b to file, return number written.\n"
+"\n"
+"Only makes one system call, so not all of the data may be written.\n"
+"The number of bytes actually written is returned.");
+
+PyDoc_STRVAR(fileno_doc,
+"fileno() -> int. \"file descriptor\".\n"
+"\n"
+"This is needed for lower-level file interfaces, such the fcntl module.");
+
+PyDoc_STRVAR(seek_doc,
+"seek(offset: int[, whence: int]) -> None.  Move to new file position.\n"
+"\n"
+"Argument offset is a byte count.  Optional argument whence defaults to\n"
+"0 (offset from start of file, offset should be >= 0); other values are 1\n"
+"(move relative to current position, positive or negative), and 2 (move\n"
+"relative to end of file, usually negative, although many platforms allow\n"
+"seeking beyond the end of a file)."
+"\n"
+"Note that not all file objects are seekable.");
+
+#ifdef HAVE_FTRUNCATE
+PyDoc_STRVAR(truncate_doc,
+"truncate([size: int]) -> None.	 Truncate the file to at most size bytes.\n"
+"\n"
+"Size defaults to the current file position, as returned by tell().");
+#endif
+
+PyDoc_STRVAR(tell_doc,
+"tell() -> int.	 Current file position");
+
+PyDoc_STRVAR(readinto_doc,
+"readinto() -> Undocumented.  Don't use this; it may go away.");
+
+PyDoc_STRVAR(close_doc,
+"close() -> None.  Close the file.\n"
+"\n"
+"A closed file cannot be used for further I/O operations.  close() may be\n"
+"called more than once without error.  Changes the fileno to -1.");
+
+PyDoc_STRVAR(isatty_doc,
+"isatty() -> bool.  True if the file is connected to a tty device.");
+
+PyDoc_STRVAR(seekable_doc,
+"seekable() -> bool.  True if file supports random-access.");
+
+PyDoc_STRVAR(readable_doc,
+"readable() -> bool.  True if file was opened in a read mode.");
+
+PyDoc_STRVAR(writable_doc,
+"writable() -> bool.  True if file was opened in a write mode.");
+
+static PyMethodDef fileio_methods[] = {
+	{"read",     (PyCFunction)fileio_read,	   METH_VARARGS, read_doc},
+	{"readall",  (PyCFunction)fileio_readall,  METH_NOARGS,  readall_doc},
+	{"readinto", (PyCFunction)fileio_readinto, METH_VARARGS, readinto_doc},
+	{"write",    (PyCFunction)fileio_write,	   METH_VARARGS, write_doc},
+	{"seek",     (PyCFunction)fileio_seek,	   METH_VARARGS, seek_doc},
+	{"tell",     (PyCFunction)fileio_tell,	   METH_VARARGS, tell_doc},
+#ifdef HAVE_FTRUNCATE
+	{"truncate", (PyCFunction)fileio_truncate, METH_VARARGS, truncate_doc},
+#endif
+	{"close",    (PyCFunction)fileio_close,	   METH_NOARGS,	 close_doc},
+	{"seekable", (PyCFunction)fileio_seekable, METH_NOARGS,	 seekable_doc},
+	{"readable", (PyCFunction)fileio_readable, METH_NOARGS,	 readable_doc},
+	{"writable", (PyCFunction)fileio_writable, METH_NOARGS,	 writable_doc},
+	{"fileno",   (PyCFunction)fileio_fileno,   METH_NOARGS,	 fileno_doc},
+	{"isatty",   (PyCFunction)fileio_isatty,   METH_NOARGS,	 isatty_doc},
+	{NULL,	     NULL}	       /* sentinel */
+};
+
+/* 'closed' and 'mode' are attributes for backwards compatibility reasons. */
+
+static PyObject *
+get_closed(PyFileIOObject *self, void *closure)
+{
+	return PyBool_FromLong((long)(self->fd < 0));
+}
+
+static PyObject *
+get_mode(PyFileIOObject *self, void *closure)
+{
+	return PyString_FromString(mode_string(self));
+}
+
+static PyGetSetDef fileio_getsetlist[] = {
+	{"closed", (getter)get_closed, NULL, "True if the file is closed"},
+	{"mode", (getter)get_mode, NULL, "String giving the file mode"},
+	{0},
+};
+
+PyTypeObject PyFileIO_Type = {
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
+	"_FileIO",
+	sizeof(PyFileIOObject),
+	0,
+	(destructor)fileio_dealloc,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_compare */
+	(reprfunc)fileio_repr,			/* tp_repr */
+	0,					/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	0,					/* tp_hash */
+	0,					/* tp_call */
+	0,					/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
+	fileio_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	0,					/* tp_richcompare */
+	offsetof(PyFileIOObject, weakreflist),	/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	fileio_methods,				/* tp_methods */
+	0,					/* tp_members */
+	fileio_getsetlist,			/* tp_getset */
+	0,					/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	fileio_init,				/* tp_init */
+	PyType_GenericAlloc,			/* tp_alloc */
+	fileio_new,				/* tp_new */
+	PyObject_Del,				/* tp_free */
+};
+
+static PyMethodDef module_methods[] = {
+	{NULL, NULL}
+};
+
+PyMODINIT_FUNC
+init_fileio(void)
+{
+	PyObject *m;	/* a module object */
+
+	m = Py_InitModule3("_fileio", module_methods,
+			   "Fast implementation of io.FileIO.");
+	if (m == NULL)
+		return;
+	if (PyType_Ready(&PyFileIO_Type) < 0)
+		return;
+	Py_INCREF(&PyFileIO_Type);
+	PyModule_AddObject(m, "_FileIO", (PyObject *) &PyFileIO_Type);
+}

Objects/longobject.c

@@ -11,7 +11,7 @@
 
 /* For long multiplication, use the O(N**2) school algorithm unless
  * both operands contain more than KARATSUBA_CUTOFF digits (this
- * being an internal Python long digit, in base BASE).
+ * being an internal Python long digit, in base PyLong_BASE).
  */
 #define KARATSUBA_CUTOFF 70
 #define KARATSUBA_SQUARE_CUTOFF (2 * KARATSUBA_CUTOFF)
@@ -115,7 +115,7 @@ PyLong_FromLong(long ival)
 	t = (unsigned long)ival;
 	while (t) {
 		++ndigits;
-		t >>= SHIFT;
+		t >>= PyLong_SHIFT;
 	}
 	v = _PyLong_New(ndigits);
 	if (v != NULL) {
@@ -123,8 +123,8 @@ PyLong_FromLong(long ival)
 		v->ob_size = negative ? -ndigits : ndigits;
 		t = (unsigned long)ival;
 		while (t) {
-			*p++ = (digit)(t & MASK);
+			*p++ = (digit)(t & PyLong_MASK);
-			t >>= SHIFT;
+			t >>= PyLong_SHIFT;
 		}
 	}
 	return (PyObject *)v;
@@ -143,15 +143,15 @@ PyLong_FromUnsignedLong(unsigned long ival)
 	t = (unsigned long)ival;
 	while (t) {
 		++ndigits;
-		t >>= SHIFT;
+		t >>= PyLong_SHIFT;
 	}
 	v = _PyLong_New(ndigits);
 	if (v != NULL) {
 		digit *p = v->ob_digit;
 		Py_SIZE(v) = ndigits;
 		while (ival) {
-			*p++ = (digit)(ival & MASK);
+			*p++ = (digit)(ival & PyLong_MASK);
-			ival >>= SHIFT;
+			ival >>= PyLong_SHIFT;
 		}
 	}
 	return (PyObject *)v;
@@ -181,16 +181,16 @@ PyLong_FromDouble(double dval)
 	frac = frexp(dval, &expo); /* dval = frac*2**expo; 0.0 <= frac < 1.0 */
 	if (expo <= 0)
 		return PyLong_FromLong(0L);
-	ndig = (expo-1) / SHIFT + 1; /* Number of 'digits' in result */
+	ndig = (expo-1) / PyLong_SHIFT + 1; /* Number of 'digits' in result */
 	v = _PyLong_New(ndig);
 	if (v == NULL)
 		return NULL;
-	frac = ldexp(frac, (expo-1) % SHIFT + 1);
+	frac = ldexp(frac, (expo-1) % PyLong_SHIFT + 1);
 	for (i = ndig; --i >= 0; ) {
 		long bits = (long)frac;
 		v->ob_digit[i] = (digit) bits;
 		frac = frac - (double)bits;
-		frac = ldexp(frac, SHIFT);
+		frac = ldexp(frac, PyLong_SHIFT);
 	}
 	if (neg)
 		Py_SIZE(v) = -(Py_SIZE(v));
@@ -237,8 +237,8 @@ PyLong_AsLong(PyObject *vv)
 	}
 	while (--i >= 0) {
 		prev = x;
-		x = (x << SHIFT) + v->ob_digit[i];
+		x = (x << PyLong_SHIFT) + v->ob_digit[i];
-		if ((x >> SHIFT) != prev)
+		if ((x >> PyLong_SHIFT) != prev)
 			goto overflow;
 	}
 	/* Haven't lost any bits, but casting to long requires extra care
@@ -262,7 +262,7 @@ PyLong_AsLong(PyObject *vv)
    Returns -1 and sets an error condition if overflow occurs. */
 
 Py_ssize_t
-_PyLong_AsSsize_t(PyObject *vv) {
+PyLong_AsSsize_t(PyObject *vv) {
 	register PyLongObject *v;
 	size_t x, prev;
 	Py_ssize_t i;
@@ -282,8 +282,8 @@ _PyLong_AsSsize_t(PyObject *vv) {
 	}
 	while (--i >= 0) {
 		prev = x;
-		x = (x << SHIFT) + v->ob_digit[i];
+		x = (x << PyLong_SHIFT) + v->ob_digit[i];
-		if ((x >> SHIFT) != prev)
+		if ((x >> PyLong_SHIFT) != prev)
 			goto overflow;
 	}
 	/* Haven't lost any bits, but casting to a signed type requires
@@ -336,8 +336,8 @@ PyLong_AsUnsignedLong(PyObject *vv)
 	}
 	while (--i >= 0) {
 		prev = x;
-		x = (x << SHIFT) + v->ob_digit[i];
+		x = (x << PyLong_SHIFT) + v->ob_digit[i];
-		if ((x >> SHIFT) != prev) {
+		if ((x >> PyLong_SHIFT) != prev) {
 			PyErr_SetString(PyExc_OverflowError,
 				"long int too large to convert");
 			return (unsigned long) -1;
@@ -372,7 +372,7 @@ PyLong_AsUnsignedLongMask(PyObject *vv)
 		i = -i;
 	}
 	while (--i >= 0) {
-		x = (x << SHIFT) + v->ob_digit[i];
+		x = (x << PyLong_SHIFT) + v->ob_digit[i];
 	}
 	return x * sign;
 }
@@ -402,8 +402,8 @@ _PyLong_NumBits(PyObject *vv)
 	if (ndigits > 0) {
 		digit msd = v->ob_digit[ndigits - 1];
 
-		result = (ndigits - 1) * SHIFT;
+		result = (ndigits - 1) * PyLong_SHIFT;
-		if (result / SHIFT != (size_t)(ndigits - 1))
+		if (result / PyLong_SHIFT != (size_t)(ndigits - 1))
 			goto Overflow;
 		do {
 			++result;
@@ -473,9 +473,9 @@ _PyLong_FromByteArray(const unsigned char* bytes, size_t n,
 	}
 
 	/* How many Python long digits do we need?  We have
-	   8*numsignificantbytes bits, and each Python long digit has SHIFT
+	   8*numsignificantbytes bits, and each Python long digit has PyLong_SHIFT
 	   bits, so it's the ceiling of the quotient. */
-	ndigits = (numsignificantbytes * 8 + SHIFT - 1) / SHIFT;
+	ndigits = (numsignificantbytes * 8 + PyLong_SHIFT - 1) / PyLong_SHIFT;
 	if (ndigits > (size_t)INT_MAX)
 		return PyErr_NoMemory();
 	v = _PyLong_New((int)ndigits);
@@ -505,17 +505,17 @@ _PyLong_FromByteArray(const unsigned char* bytes, size_t n,
 			   so needs to be prepended to accum. */
 			accum |= thisbyte << accumbits;
 			accumbits += 8;
-			if (accumbits >= SHIFT) {
+			if (accumbits >= PyLong_SHIFT) {
 				/* There's enough to fill a Python digit. */
 				assert(idigit < (int)ndigits);
-				v->ob_digit[idigit] = (digit)(accum & MASK);
+				v->ob_digit[idigit] = (digit)(accum & PyLong_MASK);
 				++idigit;
-				accum >>= SHIFT;
+				accum >>= PyLong_SHIFT;
-				accumbits -= SHIFT;
+				accumbits -= PyLong_SHIFT;
-				assert(accumbits < SHIFT);
+				assert(accumbits < PyLong_SHIFT);
 			}
 		}
-		assert(accumbits < SHIFT);
+		assert(accumbits < PyLong_SHIFT);
 		if (accumbits) {
 			assert(idigit < (int)ndigits);
 			v->ob_digit[idigit] = (digit)accum;
@@ -569,7 +569,7 @@ _PyLong_AsByteArray(PyLongObject* v,
 
 	/* Copy over all the Python digits.
 	   It's crucial that every Python digit except for the MSD contribute
-	   exactly SHIFT bits to the total, so first assert that the long is
+	   exactly PyLong_SHIFT bits to the total, so first assert that the long is
 	   normalized. */
 	assert(ndigits == 0 || v->ob_digit[ndigits - 1] != 0);
 	j = 0;
@@ -579,15 +579,15 @@ _PyLong_AsByteArray(PyLongObject* v,
 	for (i = 0; i < ndigits; ++i) {
 		twodigits thisdigit = v->ob_digit[i];
 		if (do_twos_comp) {
-			thisdigit = (thisdigit ^ MASK) + carry;
+			thisdigit = (thisdigit ^ PyLong_MASK) + carry;
-			carry = thisdigit >> SHIFT;
+			carry = thisdigit >> PyLong_SHIFT;
-			thisdigit &= MASK;
+			thisdigit &= PyLong_MASK;
 		}
 		/* Because we're going LSB to MSB, thisdigit is more
 		   significant than what's already in accum, so needs to be
 		   prepended to accum. */
 		accum |= thisdigit << accumbits;
-		accumbits += SHIFT;
+		accumbits += PyLong_SHIFT;
 
 		/* The most-significant digit may be (probably is) at least
 		   partly empty. */
@@ -598,9 +598,9 @@ _PyLong_AsByteArray(PyLongObject* v,
 			 * First shift conceptual sign bit to real sign bit.
 			 */
 			stwodigits s = (stwodigits)(thisdigit <<
-				(8*sizeof(stwodigits) - SHIFT));
+				(8*sizeof(stwodigits) - PyLong_SHIFT));
 			unsigned int nsignbits = 0;
-			while ((s < 0) == do_twos_comp && nsignbits < SHIFT) {
+			while ((s < 0) == do_twos_comp && nsignbits < PyLong_SHIFT) {
 				++nsignbits;
 				s <<= 1;
 			}
@@ -680,7 +680,7 @@ _PyLong_AsScaledDouble(PyObject *vv, int *exponent)
 #define NBITS_WANTED 57
 	PyLongObject *v;
 	double x;
-	const double multiplier = (double)(1L << SHIFT);
+	const double multiplier = (double)(1L << PyLong_SHIFT);
 	Py_ssize_t i;
 	int sign;
 	int nbitsneeded;
@@ -707,10 +707,10 @@ _PyLong_AsScaledDouble(PyObject *vv, int *exponent)
 	while (i > 0 && nbitsneeded > 0) {
 		--i;
 		x = x * multiplier + (double)v->ob_digit[i];
-		nbitsneeded -= SHIFT;
+		nbitsneeded -= PyLong_SHIFT;
 	}
 	/* There are i digits we didn't shift in.  Pretending they're all
-	   zeroes, the true value is x * 2**(i*SHIFT). */
+	   zeroes, the true value is x * 2**(i*PyLong_SHIFT). */
 	*exponent = i;
 	assert(x > 0.0);
 	return x * sign;
@@ -735,10 +735,10 @@ PyLong_AsDouble(PyObject *vv)
 	/* 'e' initialized to -1 to silence gcc-4.0.x, but it should be
 	   set correctly after a successful _PyLong_AsScaledDouble() call */
 	assert(e >= 0);
-	if (e > INT_MAX / SHIFT)
+	if (e > INT_MAX / PyLong_SHIFT)
 		goto overflow;
 	errno = 0;
-	x = ldexp(x, e * SHIFT);
+	x = ldexp(x, e * PyLong_SHIFT);
 	if (Py_OVERFLOWED(x))
 		goto overflow;
 	return x;
@@ -846,7 +846,7 @@ PyLong_FromLongLong(PY_LONG_LONG ival)
 	t = (unsigned PY_LONG_LONG)ival;
 	while (t) {
 		++ndigits;
-		t >>= SHIFT;
+		t >>= PyLong_SHIFT;
 	}
 	v = _PyLong_New(ndigits);
 	if (v != NULL) {
@@ -854,8 +854,8 @@ PyLong_FromLongLong(PY_LONG_LONG ival)
 		Py_SIZE(v) = negative ? -ndigits : ndigits;
 		t = (unsigned PY_LONG_LONG)ival;
 		while (t) {
-			*p++ = (digit)(t & MASK);
+			*p++ = (digit)(t & PyLong_MASK);
-			t >>= SHIFT;
+			t >>= PyLong_SHIFT;
 		}
 	}
 	return (PyObject *)v;
@@ -874,15 +874,15 @@ PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG ival)
 	t = (unsigned PY_LONG_LONG)ival;
 	while (t) {
 		++ndigits;
-		t >>= SHIFT;
+		t >>= PyLong_SHIFT;
 	}
 	v = _PyLong_New(ndigits);
 	if (v != NULL) {
 		digit *p = v->ob_digit;
 		Py_SIZE(v) = ndigits;
 		while (ival) {
-			*p++ = (digit)(ival & MASK);
+			*p++ = (digit)(ival & PyLong_MASK);
-			ival >>= SHIFT;
+			ival >>= PyLong_SHIFT;
 		}
 	}
 	return (PyObject *)v;
@@ -891,7 +891,7 @@ PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG ival)
 /* Create a new long int object from a C Py_ssize_t. */
 
 PyObject *
-_PyLong_FromSsize_t(Py_ssize_t ival)
+PyLong_FromSsize_t(Py_ssize_t ival)
 {
 	Py_ssize_t bytes = ival;
 	int one = 1;
@@ -903,7 +903,7 @@ _PyLong_FromSsize_t(Py_ssize_t ival)
 /* Create a new long int object from a C size_t. */
 
 PyObject *
-_PyLong_FromSize_t(size_t ival)
+PyLong_FromSize_t(size_t ival)
 {
 	size_t bytes = ival;
 	int one = 1;
@@ -1015,7 +1015,7 @@ PyLong_AsUnsignedLongLongMask(PyObject *vv)
 		i = -i;
 	}
 	while (--i >= 0) {
-		x = (x << SHIFT) + v->ob_digit[i];
+		x = (x << PyLong_SHIFT) + v->ob_digit[i];
 	}
 	return x * sign;
 }
@@ -1069,14 +1069,14 @@ v_iadd(digit *x, Py_ssize_t m, digit *y, Py_ssize_t n)
 	assert(m >= n);
 	for (i = 0; i < n; ++i) {
 		carry += x[i] + y[i];
-		x[i] = carry & MASK;
+		x[i] = carry & PyLong_MASK;
-		carry >>= SHIFT;
+		carry >>= PyLong_SHIFT;
 		assert((carry & 1) == carry);
 	}
 	for (; carry && i < m; ++i) {
 		carry += x[i];
-		x[i] = carry & MASK;
+		x[i] = carry & PyLong_MASK;
-		carry >>= SHIFT;
+		carry >>= PyLong_SHIFT;
 		assert((carry & 1) == carry);
 	}
 	return carry;
@@ -1095,14 +1095,14 @@ v_isub(digit *x, Py_ssize_t m, digit *y, Py_ssize_t n)
 	assert(m >= n);
 	for (i = 0; i < n; ++i) {
 		borrow = x[i] - y[i] - borrow;
-		x[i] = borrow & MASK;
+		x[i] = borrow & PyLong_MASK;
-		borrow >>= SHIFT;
+		borrow >>= PyLong_SHIFT;
 		borrow &= 1;	/* keep only 1 sign bit */
 	}
 	for (; borrow && i < m; ++i) {
 		borrow = x[i] - borrow;
-		x[i] = borrow & MASK;
+		x[i] = borrow & PyLong_MASK;
-		borrow >>= SHIFT;
+		borrow >>= PyLong_SHIFT;
 		borrow &= 1;
 	}
 	return borrow;
@@ -1130,8 +1130,8 @@ muladd1(PyLongObject *a, wdigit n, wdigit extra)
 		return NULL;
 	for (i = 0; i < size_a; ++i) {
 		carry += (twodigits)a->ob_digit[i] * n;
-		z->ob_digit[i] = (digit) (carry & MASK);
+		z->ob_digit[i] = (digit) (carry & PyLong_MASK);
-		carry >>= SHIFT;
+		carry >>= PyLong_SHIFT;
 	}
 	z->ob_digit[i] = (digit) carry;
 	return long_normalize(z);
@@ -1148,12 +1148,12 @@ inplace_divrem1(digit *pout, digit *pin, Py_ssize_t size, digit n)
 {
 	twodigits rem = 0;
 
-	assert(n > 0 && n <= MASK);
+	assert(n > 0 && n <= PyLong_MASK);
 	pin += size;
 	pout += size;
 	while (--size >= 0) {
 		digit hi;
-		rem = (rem << SHIFT) + *--pin;
+		rem = (rem << PyLong_SHIFT) + *--pin;
 		*--pout = hi = (digit)(rem / n);
 		rem -= hi * n;
 	}
@@ -1170,7 +1170,7 @@ divrem1(PyLongObject *a, digit n, digit *prem)
 	const Py_ssize_t size = ABS(Py_SIZE(a));
 	PyLongObject *z;
 
-	assert(n > 0 && n <= MASK);
+	assert(n > 0 && n <= PyLong_MASK);
 	z = _PyLong_New(size);
 	if (z == NULL)
 		return NULL;
@@ -1208,9 +1208,9 @@ long_format(PyObject *aa, int base, int addL)
 		i >>= 1;
 	}
 	i = 5 + (addL ? 1 : 0);
-	j = size_a*SHIFT + bits-1;
+	j = size_a*PyLong_SHIFT + bits-1;
 	sz = i + j / bits;
-	if (j / SHIFT < size_a || sz < i) {
+	if (j / PyLong_SHIFT < size_a || sz < i) {
 		PyErr_SetString(PyExc_OverflowError,
 				"long is too large to format");
 		return NULL;
@@ -1239,7 +1239,7 @@ long_format(PyObject *aa, int base, int addL)
 
 		for (i = 0; i < size_a; ++i) {
 			accum |= (twodigits)a->ob_digit[i] << accumbits;
-			accumbits += SHIFT;
+			accumbits += PyLong_SHIFT;
 			assert(accumbits >= basebits);
 			do {
 				char cdigit = (char)(accum & (base - 1));
@@ -1264,7 +1264,7 @@ long_format(PyObject *aa, int base, int addL)
 		int power = 1;
 		for (;;) {
 			unsigned long newpow = powbase * (unsigned long)base;
-			if (newpow >> SHIFT)  /* doesn't fit in a digit */
+			if (newpow >> PyLong_SHIFT)  /* doesn't fit in a digit */
 				break;
 			powbase = (digit)newpow;
 			++power;
@@ -1390,14 +1390,14 @@ long_from_binary_base(char **str, int base)
 	while (_PyLong_DigitValue[Py_CHARMASK(*p)] < base)
 		++p;
 	*str = p;
-	/* n <- # of Python digits needed, = ceiling(n/SHIFT). */
+	/* n <- # of Python digits needed, = ceiling(n/PyLong_SHIFT). */
-	n = (p - start) * bits_per_char + SHIFT - 1;
+	n = (p - start) * bits_per_char + PyLong_SHIFT - 1;
 	if (n / bits_per_char < p - start) {
 		PyErr_SetString(PyExc_ValueError,
 				"long string too large to convert");
 		return NULL;
 	}
-	n = n / SHIFT;
+	n = n / PyLong_SHIFT;
 	z = _PyLong_New(n);
 	if (z == NULL)
 		return NULL;
@@ -1412,16 +1412,16 @@ long_from_binary_base(char **str, int base)
 		assert(k >= 0 && k < base);
 		accum |= (twodigits)(k << bits_in_accum);
 		bits_in_accum += bits_per_char;
-		if (bits_in_accum >= SHIFT) {
+		if (bits_in_accum >= PyLong_SHIFT) {
-			*pdigit++ = (digit)(accum & MASK);
+			*pdigit++ = (digit)(accum & PyLong_MASK);
 			assert(pdigit - z->ob_digit <= (int)n);
-			accum >>= SHIFT;
+			accum >>= PyLong_SHIFT;
-			bits_in_accum -= SHIFT;
+			bits_in_accum -= PyLong_SHIFT;
-			assert(bits_in_accum < SHIFT);
+			assert(bits_in_accum < PyLong_SHIFT);
 		}
 	}
 	if (bits_in_accum) {
-		assert(bits_in_accum <= SHIFT);
+		assert(bits_in_accum <= PyLong_SHIFT);
 		*pdigit++ = (digit)accum;
 		assert(pdigit - z->ob_digit <= (int)n);
 	}
@@ -1478,18 +1478,18 @@ First some math:  the largest integer that can be expressed in N base-B digits
 is B**N-1.  Consequently, if we have an N-digit input in base B, the worst-
 case number of Python digits needed to hold it is the smallest integer n s.t.
 
-    BASE**n-1 >= B**N-1  [or, adding 1 to both sides]
+    PyLong_BASE**n-1 >= B**N-1  [or, adding 1 to both sides]
-    BASE**n >= B**N      [taking logs to base BASE]
+    PyLong_BASE**n >= B**N      [taking logs to base PyLong_BASE]
-    n >= log(B**N)/log(BASE) = N * log(B)/log(BASE)
+    n >= log(B**N)/log(PyLong_BASE) = N * log(B)/log(PyLong_BASE)
 
-The static array log_base_BASE[base] == log(base)/log(BASE) so we can compute
+The static array log_base_PyLong_BASE[base] == log(base)/log(PyLong_BASE) so we can compute
 this quickly.  A Python long with that much space is reserved near the start,
 and the result is computed into it.
 
 The input string is actually treated as being in base base**i (i.e., i digits
 are processed at a time), where two more static arrays hold:
 
-    convwidth_base[base] = the largest integer i such that base**i <= BASE
+    convwidth_base[base] = the largest integer i such that base**i <= PyLong_BASE
     convmultmax_base[base] = base ** convwidth_base[base]
 
 The first of these is the largest i such that i consecutive input digits
@@ -1506,37 +1506,37 @@ where B = convmultmax_base[base].
 Error analysis:  as above, the number of Python digits `n` needed is worst-
 case
 
-    n >= N * log(B)/log(BASE)
+    n >= N * log(B)/log(PyLong_BASE)
 
 where `N` is the number of input digits in base `B`.  This is computed via
 
-    size_z = (Py_ssize_t)((scan - str) * log_base_BASE[base]) + 1;
+    size_z = (Py_ssize_t)((scan - str) * log_base_PyLong_BASE[base]) + 1;
 
 below.  Two numeric concerns are how much space this can waste, and whether
-the computed result can be too small.  To be concrete, assume BASE = 2**15,
+the computed result can be too small.  To be concrete, assume PyLong_BASE = 2**15,
 which is the default (and it's unlikely anyone changes that).
 
 Waste isn't a problem:  provided the first input digit isn't 0, the difference
 between the worst-case input with N digits and the smallest input with N
-digits is about a factor of B, but B is small compared to BASE so at most
+digits is about a factor of B, but B is small compared to PyLong_BASE so at most
 one allocated Python digit can remain unused on that count.  If
-N*log(B)/log(BASE) is mathematically an exact integer, then truncating that
+N*log(B)/log(PyLong_BASE) is mathematically an exact integer, then truncating that
 and adding 1 returns a result 1 larger than necessary.  However, that can't
 happen:  whenever B is a power of 2, long_from_binary_base() is called
 instead, and it's impossible for B**i to be an integer power of 2**15 when
-B is not a power of 2 (i.e., it's impossible for N*log(B)/log(BASE) to be
+B is not a power of 2 (i.e., it's impossible for N*log(B)/log(PyLong_BASE) to be
 an exact integer when B is not a power of 2, since B**i has a prime factor
 other than 2 in that case, but (2**15)**j's only prime factor is 2).
 
-The computed result can be too small if the true value of N*log(B)/log(BASE)
+The computed result can be too small if the true value of N*log(B)/log(PyLong_BASE)
 is a little bit larger than an exact integer, but due to roundoff errors (in
-computing log(B), log(BASE), their quotient, and/or multiplying that by N)
+computing log(B), log(PyLong_BASE), their quotient, and/or multiplying that by N)
 yields a numeric result a little less than that integer.  Unfortunately, "how
 close can a transcendental function get to an integer over some range?"
 questions are generally theoretically intractable.  Computer analysis via
-continued fractions is practical:  expand log(B)/log(BASE) via continued
+continued fractions is practical:  expand log(B)/log(PyLong_BASE) via continued
 fractions, giving a sequence i/j of "the best" rational approximations.  Then
-j*log(B)/log(BASE) is approximately equal to (the integer) i.  This shows that
+j*log(B)/log(PyLong_BASE) is approximately equal to (the integer) i.  This shows that
 we can get very close to being in trouble, but very rarely.  For example,
 76573 is a denominator in one of the continued-fraction approximations to
 log(10)/log(2**15), and indeed:
@@ -1562,19 +1562,19 @@ digit beyond the first.
 		digit *pz, *pzstop;
 		char* scan;
 
-		static double log_base_BASE[37] = {0.0e0,};
+		static double log_base_PyLong_BASE[37] = {0.0e0,};
 		static int convwidth_base[37] = {0,};
 		static twodigits convmultmax_base[37] = {0,};
 
-		if (log_base_BASE[base] == 0.0) {
+		if (log_base_PyLong_BASE[base] == 0.0) {
 			twodigits convmax = base;
 			int i = 1;
 
-			log_base_BASE[base] = log((double)base) /
+			log_base_PyLong_BASE[base] = log((double)base) /
-						log((double)BASE);
+						log((double)PyLong_BASE);
 			for (;;) {
 				twodigits next = convmax * base;
-				if (next > BASE)
+				if (next > PyLong_BASE)
 					break;
 				convmax = next;
 				++i;
@@ -1594,7 +1594,7 @@ digit beyond the first.
 		 * need to initialize z->ob_digit -- no slot is read up before
 		 * being stored into.
 		 */
-		size_z = (Py_ssize_t)((scan - str) * log_base_BASE[base]) + 1;
+		size_z = (Py_ssize_t)((scan - str) * log_base_PyLong_BASE[base]) + 1;
 		/* Uncomment next line to test exceedingly rare copy code */
 		/* size_z = 1; */
 		assert(size_z > 0);
@@ -1616,7 +1616,7 @@ digit beyond the first.
 			for (i = 1; i < convwidth && str != scan; ++i, ++str) {
 				c = (twodigits)(c *  base +
 					_PyLong_DigitValue[Py_CHARMASK(*str)]);
-				assert(c < BASE);
+				assert(c < PyLong_BASE);
 			}
 
 			convmult = convmultmax;
@@ -1634,12 +1634,12 @@ digit beyond the first.
 			pzstop = pz + Py_SIZE(z);
 			for (; pz < pzstop; ++pz) {
 				c += (twodigits)*pz * convmult;
-				*pz = (digit)(c & MASK);
+				*pz = (digit)(c & PyLong_MASK);
-				c >>= SHIFT;
+				c >>= PyLong_SHIFT;
 			}
 			/* carry off the current end? */
 			if (c) {
-				assert(c < BASE);
+				assert(c < PyLong_BASE);
 				if (Py_SIZE(z) < size_z) {
 					*pz = (digit)c;
 					++Py_SIZE(z);
@@ -1783,7 +1783,7 @@ static PyLongObject *
 x_divrem(PyLongObject *v1, PyLongObject *w1, PyLongObject **prem)
 {
 	Py_ssize_t size_v = ABS(Py_SIZE(v1)), size_w = ABS(Py_SIZE(w1));
-	digit d = (digit) ((twodigits)BASE / (w1->ob_digit[size_w-1] + 1));
+	digit d = (digit) ((twodigits)PyLong_BASE / (w1->ob_digit[size_w-1] + 1));
 	PyLongObject *v = mul1(v1, d);
 	PyLongObject *w = mul1(w1, d);
 	PyLongObject *a;
@@ -1815,28 +1815,28 @@ x_divrem(PyLongObject *v1, PyLongObject *w1, PyLongObject **prem)
 			break;
 		})
 		if (vj == w->ob_digit[size_w-1])
-			q = MASK;
+			q = PyLong_MASK;
 		else
-			q = (((twodigits)vj << SHIFT) + v->ob_digit[j-1]) /
+			q = (((twodigits)vj << PyLong_SHIFT) + v->ob_digit[j-1]) /
 				w->ob_digit[size_w-1];
 
 		while (w->ob_digit[size_w-2]*q >
 				((
-					((twodigits)vj << SHIFT)
+					((twodigits)vj << PyLong_SHIFT)
 					+ v->ob_digit[j-1]
 					- q*w->ob_digit[size_w-1]
-								) << SHIFT)
+								) << PyLong_SHIFT)
 				+ v->ob_digit[j-2])
 			--q;
 
 		for (i = 0; i < size_w && i+k < size_v; ++i) {
 			twodigits z = w->ob_digit[i] * q;
-			digit zz = (digit) (z >> SHIFT);
+			digit zz = (digit) (z >> PyLong_SHIFT);
 			carry += v->ob_digit[i+k] - z
-				+ ((twodigits)zz << SHIFT);
+				+ ((twodigits)zz << PyLong_SHIFT);
-			v->ob_digit[i+k] = (digit)(carry & MASK);
+			v->ob_digit[i+k] = (digit)(carry & PyLong_MASK);
-			carry = Py_ARITHMETIC_RIGHT_SHIFT(BASE_TWODIGITS_TYPE,
+			carry = Py_ARITHMETIC_RIGHT_SHIFT(PyLong_BASE_TWODIGITS_TYPE,
-							  carry, SHIFT);
+							  carry, PyLong_SHIFT);
 			carry -= zz;
 		}
 
@@ -1853,10 +1853,10 @@ x_divrem(PyLongObject *v1, PyLongObject *w1, PyLongObject **prem)
 			carry = 0;
 			for (i = 0; i < size_w && i+k < size_v; ++i) {
 				carry += v->ob_digit[i+k] + w->ob_digit[i];
-				v->ob_digit[i+k] = (digit)(carry & MASK);
+				v->ob_digit[i+k] = (digit)(carry & PyLong_MASK);
 				carry = Py_ARITHMETIC_RIGHT_SHIFT(
-						BASE_TWODIGITS_TYPE,
+						PyLong_BASE_TWODIGITS_TYPE,
-						carry, SHIFT);
+						carry, PyLong_SHIFT);
 			}
 		}
 	} /* for j, k */
@@ -1940,13 +1940,13 @@ long_hash(PyLongObject *v)
 		sign = -1;
 		i = -(i);
 	}
-#define LONG_BIT_SHIFT	(8*sizeof(long) - SHIFT)
+#define LONG_BIT_PyLong_SHIFT	(8*sizeof(long) - PyLong_SHIFT)
 	/* The following loop produces a C long x such that (unsigned long)x
 	   is congruent to the absolute value of v modulo ULONG_MAX.  The
 	   resulting x is nonzero if and only if v is. */
 	while (--i >= 0) {
 		/* Force a native long #-bits (32 or 64) circular shift */
-		x = ((x << SHIFT) & ~MASK) | ((x >> LONG_BIT_SHIFT) & MASK);
+		x = ((x << PyLong_SHIFT) & ~PyLong_MASK) | ((x >> LONG_BIT_PyLong_SHIFT) & PyLong_MASK);
 		x += v->ob_digit[i];
 		/* If the addition above overflowed (thinking of x as
 		   unsigned), we compensate by incrementing.  This preserves
@@ -1954,7 +1954,7 @@ long_hash(PyLongObject *v)
 		if ((unsigned long)x < v->ob_digit[i])
 			x++;
 	}
-#undef LONG_BIT_SHIFT
+#undef LONG_BIT_PyLong_SHIFT
 	x = x * sign;
 	if (x == -1)
 		x = -2;
@@ -1984,13 +1984,13 @@ x_add(PyLongObject *a, PyLongObject *b)
 		return NULL;
 	for (i = 0; i < size_b; ++i) {
 		carry += a->ob_digit[i] + b->ob_digit[i];
-		z->ob_digit[i] = carry & MASK;
+		z->ob_digit[i] = carry & PyLong_MASK;
-		carry >>= SHIFT;
+		carry >>= PyLong_SHIFT;
 	}
 	for (; i < size_a; ++i) {
 		carry += a->ob_digit[i];
-		z->ob_digit[i] = carry & MASK;
+		z->ob_digit[i] = carry & PyLong_MASK;
-		carry >>= SHIFT;
+		carry >>= PyLong_SHIFT;
 	}
 	z->ob_digit[i] = carry;
 	return long_normalize(z);
@@ -2033,16 +2033,16 @@ x_sub(PyLongObject *a, PyLongObject *b)
 		return NULL;
 	for (i = 0; i < size_b; ++i) {
 		/* The following assumes unsigned arithmetic
-		   works module 2**N for some N>SHIFT. */
+		   works module 2**N for some N>PyLong_SHIFT. */
 		borrow = a->ob_digit[i] - b->ob_digit[i] - borrow;
-		z->ob_digit[i] = borrow & MASK;
+		z->ob_digit[i] = borrow & PyLong_MASK;
-		borrow >>= SHIFT;
+		borrow >>= PyLong_SHIFT;
 		borrow &= 1; /* Keep only one sign bit */
 	}
 	for (; i < size_a; ++i) {
 		borrow = a->ob_digit[i] - borrow;
-		z->ob_digit[i] = borrow & MASK;
+		z->ob_digit[i] = borrow & PyLong_MASK;
-		borrow >>= SHIFT;
+		borrow >>= PyLong_SHIFT;
 		borrow &= 1; /* Keep only one sign bit */
 	}
 	assert(borrow == 0);
@@ -2140,9 +2140,9 @@ x_mul(PyLongObject *a, PyLongObject *b)
 			})
 
 			carry = *pz + f * f;
-			*pz++ = (digit)(carry & MASK);
+			*pz++ = (digit)(carry & PyLong_MASK);
-			carry >>= SHIFT;
+			carry >>= PyLong_SHIFT;
-			assert(carry <= MASK);
+			assert(carry <= PyLong_MASK);
 
 			/* Now f is added in twice in each column of the
 			 * pyramid it appears.  Same as adding f<<1 once.
@@ -2150,18 +2150,18 @@ x_mul(PyLongObject *a, PyLongObject *b)
 			f <<= 1;
 			while (pa < paend) {
 				carry += *pz + *pa++ * f;
-				*pz++ = (digit)(carry & MASK);
+				*pz++ = (digit)(carry & PyLong_MASK);
-				carry >>= SHIFT;
+				carry >>= PyLong_SHIFT;
-				assert(carry <= (MASK << 1));
+				assert(carry <= (PyLong_MASK << 1));
 			}
 			if (carry) {
 				carry += *pz;
-				*pz++ = (digit)(carry & MASK);
+				*pz++ = (digit)(carry & PyLong_MASK);
-				carry >>= SHIFT;
+				carry >>= PyLong_SHIFT;
 			}
 			if (carry)
-				*pz += (digit)(carry & MASK);
+				*pz += (digit)(carry & PyLong_MASK);
-			assert((carry >> SHIFT) == 0);
+			assert((carry >> PyLong_SHIFT) == 0);
 		}
 	}
 	else {	/* a is not the same as b -- gradeschool long mult */
@@ -2179,13 +2179,13 @@ x_mul(PyLongObject *a, PyLongObject *b)
 
 			while (pb < pbend) {
 				carry += *pz + *pb++ * f;
-				*pz++ = (digit)(carry & MASK);
+				*pz++ = (digit)(carry & PyLong_MASK);
-				carry >>= SHIFT;
+				carry >>= PyLong_SHIFT;
-				assert(carry <= MASK);
+				assert(carry <= PyLong_MASK);
 			}
 			if (carry)
-				*pz += (digit)(carry & MASK);
+				*pz += (digit)(carry & PyLong_MASK);
-			assert((carry >> SHIFT) == 0);
+			assert((carry >> PyLong_SHIFT) == 0);
 		}
 	}
 	return long_normalize(z);
@@ -2304,7 +2304,7 @@ k_mul(PyLongObject *a, PyLongObject *b)
 	 * 4. Subtract al*bl from the result, starting at shift.  This may
 	 *    underflow (borrow out of the high digit), but we don't care:
 	 *    we're effectively doing unsigned arithmetic mod
-	 *    BASE**(sizea + sizeb), and so long as the *final* result fits,
+	 *    PyLong_BASE**(sizea + sizeb), and so long as the *final* result fits,
 	 *    borrows and carries out of the high digit can be ignored.
 	 * 5. Subtract ah*bh from the result, starting at shift.
 	 * 6. Compute (ah+al)*(bh+bl), and add it into the result starting
@@ -2431,7 +2431,7 @@ the question reduces to whether asize digits is enough to hold
 (asize == bsize ? c(bsize/2) : f(bsize/2)) digits + 2 bits.  If asize < bsize,
 then we're asking whether asize digits >= f(bsize/2) digits + 2 bits.  By #4,
 asize is at least f(bsize/2)+1 digits, so this in turn reduces to whether 1
-digit is enough to hold 2 bits.  This is so since SHIFT=15 >= 2.  If
+digit is enough to hold 2 bits.  This is so since PyLong_SHIFT=15 >= 2.  If
 asize == bsize, then we're asking whether bsize digits is enough to hold
 c(bsize/2) digits + 2 bits, or equivalently (by #1) whether f(bsize/2) digits
 is enough to hold 2 bits.  This is so if bsize >= 2, which holds because
@@ -2643,15 +2643,15 @@ long_true_divide(PyObject *v, PyObject *w)
 		return NULL;
 	}
 
-	/* True value is very close to ad/bd * 2**(SHIFT*(aexp-bexp)) */
+	/* True value is very close to ad/bd * 2**(PyLong_SHIFT*(aexp-bexp)) */
 	ad /= bd;	/* overflow/underflow impossible here */
 	aexp -= bexp;
-	if (aexp > INT_MAX / SHIFT)
+	if (aexp > INT_MAX / PyLong_SHIFT)
 		goto overflow;
-	else if (aexp < -(INT_MAX / SHIFT))
+	else if (aexp < -(INT_MAX / PyLong_SHIFT))
 		return PyFloat_FromDouble(0.0);	/* underflow to 0 */
 	errno = 0;
-	ad = ldexp(ad, aexp * SHIFT);
+	ad = ldexp(ad, aexp * PyLong_SHIFT);
 	if (Py_OVERFLOWED(ad)) /* ignore underflow to 0.0 */
 		goto overflow;
 	return PyFloat_FromDouble(ad);
@@ -2837,7 +2837,7 @@ long_pow(PyObject *v, PyObject *w, PyObject *x)
 		for (i = Py_SIZE(b) - 1; i >= 0; --i) {
 			digit bi = b->ob_digit[i];
 
-			for (j = 1 << (SHIFT-1); j != 0; j >>= 1) {
+			for (j = 1 << (PyLong_SHIFT-1); j != 0; j >>= 1) {
 				MULT(z, z, z)
 				if (bi & j)
 					MULT(z, a, z)
@@ -2854,7 +2854,7 @@ long_pow(PyObject *v, PyObject *w, PyObject *x)
 		for (i = Py_SIZE(b) - 1; i >= 0; --i) {
 			const digit bi = b->ob_digit[i];
 
-			for (j = SHIFT - 5; j >= 0; j -= 5) {
+			for (j = PyLong_SHIFT - 5; j >= 0; j -= 5) {
 				const int index = (bi >> j) & 0x1f;
 				for (k = 0; k < 5; ++k)
 					MULT(z, z, z)
@@ -2973,7 +2973,7 @@ long_rshift(PyLongObject *v, PyLongObject *w)
 					"negative shift count");
 			goto rshift_error;
 		}
-		wordshift = shiftby / SHIFT;
+		wordshift = shiftby / PyLong_SHIFT;
 		newsize = ABS(Py_SIZE(a)) - wordshift;
 		if (newsize <= 0) {
 			z = _PyLong_New(0);
@@ -2981,10 +2981,10 @@ long_rshift(PyLongObject *v, PyLongObject *w)
 			Py_DECREF(b);
 			return (PyObject *)z;
 		}
-		loshift = shiftby % SHIFT;
+		loshift = shiftby % PyLong_SHIFT;
-		hishift = SHIFT - loshift;
+		hishift = PyLong_SHIFT - loshift;
 		lomask = ((digit)1 << hishift) - 1;
-		himask = MASK ^ lomask;
+		himask = PyLong_MASK ^ lomask;
 		z = _PyLong_New(newsize);
 		if (z == NULL)
 			goto rshift_error;
@@ -3029,9 +3029,9 @@ long_lshift(PyObject *v, PyObject *w)
 				"outrageous left shift count");
 		goto lshift_error;
 	}
-	/* wordshift, remshift = divmod(shiftby, SHIFT) */
+	/* wordshift, remshift = divmod(shiftby, PyLong_SHIFT) */
-	wordshift = (int)shiftby / SHIFT;
+	wordshift = (int)shiftby / PyLong_SHIFT;
-	remshift  = (int)shiftby - wordshift * SHIFT;
+	remshift  = (int)shiftby - wordshift * PyLong_SHIFT;
 
 	oldsize = ABS(a->ob_size);
 	newsize = oldsize + wordshift;
@@ -3047,8 +3047,8 @@ long_lshift(PyObject *v, PyObject *w)
 	accum = 0;
 	for (i = wordshift, j = 0; j < oldsize; i++, j++) {
 		accum |= (twodigits)a->ob_digit[j] << remshift;
-		z->ob_digit[i] = (digit)(accum & MASK);
+		z->ob_digit[i] = (digit)(accum & PyLong_MASK);
-		accum >>= SHIFT;
+		accum >>= PyLong_SHIFT;
 	}
 	if (remshift)
 		z->ob_digit[newsize-1] = (digit)accum;
@@ -3069,7 +3069,7 @@ long_bitwise(PyLongObject *a,
 	     int op,  /* '&', '|', '^' */
 	     PyLongObject *b)
 {
-	digit maska, maskb; /* 0 or MASK */
+	digit maska, maskb; /* 0 or PyLong_MASK */
 	int negz;
 	Py_ssize_t size_a, size_b, size_z;
 	PyLongObject *z;
@@ -3081,7 +3081,7 @@ long_bitwise(PyLongObject *a,
 		a = (PyLongObject *) long_invert(a);
 		if (a == NULL)
 			return NULL;
-		maska = MASK;
+		maska = PyLong_MASK;
 	}
 	else {
 		Py_INCREF(a);
@@ -3093,7 +3093,7 @@ long_bitwise(PyLongObject *a,
 			Py_DECREF(a);
 			return NULL;
 		}
-		maskb = MASK;
+		maskb = PyLong_MASK;
 	}
 	else {
 		Py_INCREF(b);
@@ -3104,23 +3104,23 @@ long_bitwise(PyLongObject *a,
 	switch (op) {
 	case '^':
 		if (maska != maskb) {
-			maska ^= MASK;
+			maska ^= PyLong_MASK;
 			negz = -1;
 		}
 		break;
 	case '&':
 		if (maska && maskb) {
 			op = '|';
-			maska ^= MASK;
+			maska ^= PyLong_MASK;
-			maskb ^= MASK;
+			maskb ^= PyLong_MASK;
 			negz = -1;
 		}
 		break;
 	case '|':
 		if (maska || maskb) {
 			op = '&';
-			maska ^= MASK;
+			maska ^= PyLong_MASK;
-			maskb ^= MASK;
+			maskb ^= PyLong_MASK;
 			negz = -1;
 		}
 		break;

Objects/unicodeobject.c

@@ -397,6 +397,57 @@ PyObject *PyUnicode_FromUnicode(const Py_UNICODE *u,
     return (PyObject *)unicode;
 }
 
+PyObject *PyUnicode_FromStringAndSize(const char *u, Py_ssize_t size)
+{
+    PyUnicodeObject *unicode;
+    /* If the Unicode data is known at construction time, we can apply
+       some optimizations which share commonly used objects.
+       Also, this means the input must be UTF-8, so fall back to the
+       UTF-8 decoder at the end. */
+    if (u != NULL) {
+
+	/* Optimization for empty strings */
+	if (size == 0 && unicode_empty != NULL) {
+	    Py_INCREF(unicode_empty);
+	    return (PyObject *)unicode_empty;
+	}
+
+	/* Single characters are shared when using this constructor.
+           Restrict to ASCII, since the input must be UTF-8. */
+	if (size == 1 && Py_CHARMASK(*u) < 128) {
+	    unicode = unicode_latin1[Py_CHARMASK(*u)];
+	    if (!unicode) {
+		unicode = _PyUnicode_New(1);
+		if (!unicode)
+		    return NULL;
+		unicode->str[0] = Py_CHARMASK(*u);
+		unicode_latin1[Py_CHARMASK(*u)] = unicode;
+	    }
+	    Py_INCREF(unicode);
+	    return (PyObject *)unicode;
+	}
+
+        return PyUnicode_DecodeUTF8(u, size, NULL);
+    }
+
+    unicode = _PyUnicode_New(size);
+    if (!unicode)
+        return NULL;
+
+    return (PyObject *)unicode;
+}
+
+PyObject *PyUnicode_FromString(const char *u)
+{
+    size_t size = strlen(u);
+    if (size > PY_SSIZE_T_MAX) {
+        PyErr_SetString(PyExc_OverflowError, "input too long");
+        return NULL;
+    }
+
+    return PyUnicode_FromStringAndSize(u, size);
+}
+
 #ifdef HAVE_WCHAR_H
 
 PyObject *PyUnicode_FromWideChar(register const wchar_t *w,
@@ -429,6 +480,420 @@ PyObject *PyUnicode_FromWideChar(register const wchar_t *w,
     return (PyObject *)unicode;
 }
 
+static void
+makefmt(char *fmt, int longflag, int size_tflag, int zeropad, int width, int precision, char c)
+{
+	*fmt++ = '%';
+	if (width) {
+		if (zeropad)
+			*fmt++ = '0';
+		fmt += sprintf(fmt, "%d", width);
+	}
+	if (precision)
+		fmt += sprintf(fmt, ".%d", precision);
+	if (longflag)
+		*fmt++ = 'l';
+	else if (size_tflag) {
+		char *f = PY_FORMAT_SIZE_T;
+		while (*f)
+			*fmt++ = *f++;
+	}
+	*fmt++ = c;
+	*fmt = '\0';
+}
+
+#define appendstring(string) {for (copy = string;*copy;) *s++ = *copy++;}
+
+PyObject *
+PyUnicode_FromFormatV(const char *format, va_list vargs)
+{
+	va_list count;
+	Py_ssize_t callcount = 0;
+	PyObject **callresults = NULL;
+	PyObject **callresult = NULL;
+	Py_ssize_t n = 0;
+	int width = 0;
+	int precision = 0;
+	int zeropad;
+	const char* f;
+	Py_UNICODE *s;
+	PyObject *string;
+	/* used by sprintf */
+	char buffer[21];
+	/* use abuffer instead of buffer, if we need more space
+	 * (which can happen if there's a format specifier with width). */
+	char *abuffer = NULL;
+	char *realbuffer;
+	Py_ssize_t abuffersize = 0;
+	char fmt[60]; /* should be enough for %0width.precisionld */
+	const char *copy;
+
+#ifdef VA_LIST_IS_ARRAY
+	Py_MEMCPY(count, vargs, sizeof(va_list));
+#else
+#ifdef  __va_copy
+	__va_copy(count, vargs);
+#else
+	count = vargs;
+#endif
+#endif
+	/* step 1: count the number of %S/%R format specifications
+	 * (we call PyObject_Str()/PyObject_Repr() for these objects
+	 * once during step 3 and put the result in an array) */
+	for (f = format; *f; f++) {
+		if (*f == '%' && (*(f+1)=='S' || *(f+1)=='R'))
+			++callcount;
+	}
+	/* step 2: allocate memory for the results of
+	 * PyObject_Str()/PyObject_Repr() calls */
+	if (callcount) {
+		callresults = PyMem_Malloc(sizeof(PyObject *)*callcount);
+		if (!callresults) {
+			PyErr_NoMemory();
+			return NULL;
+		}
+		callresult = callresults;
+	}
+	/* step 3: figure out how large a buffer we need */
+	for (f = format; *f; f++) {
+		if (*f == '%') {
+			const char* p = f;
+			width = 0;
+			while (isdigit(*f))
+				width = (width*10) + *f++ - '0';
+			while (*++f && *f != '%' && !isalpha(*f))
+				;
+
+			/* skip the 'l' or 'z' in {%ld, %zd, %lu, %zu} since
+			 * they don't affect the amount of space we reserve.
+			 */
+			if ((*f == 'l' || *f == 'z') &&
+					(f[1] == 'd' || f[1] == 'u'))
+                                ++f;
+
+			switch (*f) {
+			case 'c':
+				(void)va_arg(count, int);
+				/* fall through... */
+			case '%':
+				n++;
+				break;
+			case 'd': case 'u': case 'i': case 'x':
+				(void) va_arg(count, int);
+				/* 20 bytes is enough to hold a 64-bit
+				   integer.  Decimal takes the most space.
+				   This isn't enough for octal.
+				   If a width is specified we need more
+				   (which we allocate later). */
+				if (width < 20)
+					width = 20;
+				n += width;
+				if (abuffersize < width)
+					abuffersize = width;
+				break;
+			case 's':
+			{
+				/* UTF-8 */
+				unsigned char*s;
+				s = va_arg(count, unsigned char*);
+				while (*s) {
+					if (*s < 128) {
+						n++; s++;
+					} else if (*s < 0xc0) {
+						/* invalid UTF-8 */
+						n++; s++;
+					} else if (*s < 0xc0) {
+						n++;
+						s++; if(!*s)break;
+						s++;
+					} else if (*s < 0xe0) {
+						n++;
+						s++; if(!*s)break;
+						s++; if(!*s)break;
+						s++;
+					} else {
+						#ifdef Py_UNICODE_WIDE
+						n++;
+						#else
+						n+=2;
+						#endif
+						s++; if(!*s)break;
+						s++; if(!*s)break;
+						s++; if(!*s)break;
+						s++;
+					}
+				}
+				break;
+			}
+			case 'U':
+			{
+				PyObject *obj = va_arg(count, PyObject *);
+				assert(obj && PyUnicode_Check(obj));
+				n += PyUnicode_GET_SIZE(obj);
+				break;
+			}
+			case 'V':
+			{
+				PyObject *obj = va_arg(count, PyObject *);
+				const char *str = va_arg(count, const char *);
+				assert(obj || str);
+				assert(!obj || PyUnicode_Check(obj));
+				if (obj)
+					n += PyUnicode_GET_SIZE(obj);
+				else
+					n += strlen(str);
+				break;
+			}
+			case 'S':
+			{
+				PyObject *obj = va_arg(count, PyObject *);
+				PyObject *str;
+				assert(obj);
+				str = PyObject_Str(obj);
+				if (!str)
+					goto fail;
+				n += PyUnicode_GET_SIZE(str);
+				/* Remember the str and switch to the next slot */
+				*callresult++ = str;
+				break;
+			}
+			case 'R':
+			{
+				PyObject *obj = va_arg(count, PyObject *);
+				PyObject *repr;
+				assert(obj);
+				repr = PyObject_Repr(obj);
+				if (!repr)
+					goto fail;
+				n += PyUnicode_GET_SIZE(repr);
+				/* Remember the repr and switch to the next slot */
+				*callresult++ = repr;
+				break;
+			}
+			case 'p':
+				(void) va_arg(count, int);
+				/* maximum 64-bit pointer representation:
+				 * 0xffffffffffffffff
+				 * so 19 characters is enough.
+				 * XXX I count 18 -- what's the extra for?
+				 */
+				n += 19;
+				break;
+			default:
+				/* if we stumble upon an unknown
+				   formatting code, copy the rest of
+				   the format string to the output
+				   string. (we cannot just skip the
+				   code, since there's no way to know
+				   what's in the argument list) */
+				n += strlen(p);
+				goto expand;
+			}
+		} else
+			n++;
+	}
+ expand:
+	if (abuffersize > 20) {
+		abuffer = PyMem_Malloc(abuffersize);
+		if (!abuffer) {
+			PyErr_NoMemory();
+			goto fail;
+		}
+		realbuffer = abuffer;
+	}
+	else
+		realbuffer = buffer;
+	/* step 4: fill the buffer */
+	/* Since we've analyzed how much space we need for the worst case,
+	   we don't have to resize the string.
+	   There can be no errors beyond this point. */
+	string = PyUnicode_FromUnicode(NULL, n);
+	if (!string)
+		goto fail;
+
+	s = PyUnicode_AS_UNICODE(string);
+	callresult = callresults;
+
+	for (f = format; *f; f++) {
+		if (*f == '%') {
+			const char* p = f++;
+			int longflag = 0;
+			int size_tflag = 0;
+			zeropad = (*f == '0');
+			/* parse the width.precision part */
+			width = 0;
+			while (isdigit(*f))
+				width = (width*10) + *f++ - '0';
+			precision = 0;
+			if (*f == '.') {
+				f++;
+				while (isdigit(*f))
+					precision = (precision*10) + *f++ - '0';
+			}
+			/* handle the long flag, but only for %ld and %lu.
+			   others can be added when necessary. */
+			if (*f == 'l' && (f[1] == 'd' || f[1] == 'u')) {
+				longflag = 1;
+				++f;
+			}
+			/* handle the size_t flag. */
+			if (*f == 'z' && (f[1] == 'd' || f[1] == 'u')) {
+				size_tflag = 1;
+				++f;
+			}
+
+			switch (*f) {
+			case 'c':
+				*s++ = va_arg(vargs, int);
+				break;
+			case 'd':
+				makefmt(fmt, longflag, size_tflag, zeropad, width, precision, 'd');
+				if (longflag)
+					sprintf(realbuffer, fmt, va_arg(vargs, long));
+				else if (size_tflag)
+					sprintf(realbuffer, fmt, va_arg(vargs, Py_ssize_t));
+				else
+					sprintf(realbuffer, fmt, va_arg(vargs, int));
+				appendstring(realbuffer);
+				break;
+			case 'u':
+				makefmt(fmt, longflag, size_tflag, zeropad, width, precision, 'u');
+				if (longflag)
+					sprintf(realbuffer, fmt, va_arg(vargs, unsigned long));
+				else if (size_tflag)
+					sprintf(realbuffer, fmt, va_arg(vargs, size_t));
+				else
+					sprintf(realbuffer, fmt, va_arg(vargs, unsigned int));
+				appendstring(realbuffer);
+				break;
+			case 'i':
+				makefmt(fmt, 0, 0, zeropad, width, precision, 'i');
+				sprintf(realbuffer, fmt, va_arg(vargs, int));
+				appendstring(realbuffer);
+				break;
+			case 'x':
+				makefmt(fmt, 0, 0, zeropad, width, precision, 'x');
+				sprintf(realbuffer, fmt, va_arg(vargs, int));
+				appendstring(realbuffer);
+				break;
+			case 's':
+			{
+				/* Parameter must be UTF-8 encoded.
+				   In case of encoding errors, use
+				   the replacement character. */
+				PyObject *u;
+				p = va_arg(vargs, char*);
+				u = PyUnicode_DecodeUTF8(p, strlen(p), 
+							 "replace");
+				if (!u)
+					goto fail;
+				Py_UNICODE_COPY(s, PyUnicode_AS_UNICODE(u),
+						PyUnicode_GET_SIZE(u));
+				s += PyUnicode_GET_SIZE(u);
+				Py_DECREF(u);
+				break;
+			}
+			case 'U':
+			{
+				PyObject *obj = va_arg(vargs, PyObject *);
+				Py_ssize_t size = PyUnicode_GET_SIZE(obj);
+				Py_UNICODE_COPY(s, PyUnicode_AS_UNICODE(obj), size);
+				s += size;
+				break;
+			}
+			case 'V':
+			{
+				PyObject *obj = va_arg(vargs, PyObject *);
+				const char *str = va_arg(vargs, const char *);
+				if (obj) {
+					Py_ssize_t size = PyUnicode_GET_SIZE(obj);
+					Py_UNICODE_COPY(s, PyUnicode_AS_UNICODE(obj), size);
+					s += size;
+				} else {
+					appendstring(str);
+				}
+				break;
+			}
+			case 'S':
+			case 'R':
+			{
+				Py_UNICODE *ucopy;
+				Py_ssize_t usize;
+				Py_ssize_t upos;
+				/* unused, since we already have the result */
+				(void) va_arg(vargs, PyObject *);
+				ucopy = PyUnicode_AS_UNICODE(*callresult);
+				usize = PyUnicode_GET_SIZE(*callresult);
+				for (upos = 0; upos<usize;)
+					*s++ = ucopy[upos++];
+				/* We're done with the unicode()/repr() => forget it */
+				Py_DECREF(*callresult);
+				/* switch to next unicode()/repr() result */
+				++callresult;
+				break;
+			}
+			case 'p':
+				sprintf(buffer, "%p", va_arg(vargs, void*));
+				/* %p is ill-defined:  ensure leading 0x. */
+				if (buffer[1] == 'X')
+					buffer[1] = 'x';
+				else if (buffer[1] != 'x') {
+					memmove(buffer+2, buffer, strlen(buffer)+1);
+					buffer[0] = '0';
+					buffer[1] = 'x';
+				}
+				appendstring(buffer);
+				break;
+			case '%':
+				*s++ = '%';
+				break;
+			default:
+				appendstring(p);
+				goto end;
+			}
+		} else
+			*s++ = *f;
+	}
+
+ end:
+	if (callresults)
+		PyMem_Free(callresults);
+	if (abuffer)
+		PyMem_Free(abuffer);
+	_PyUnicode_Resize(&string, s - PyUnicode_AS_UNICODE(string));
+	return string;
+ fail:
+	if (callresults) {
+		PyObject **callresult2 = callresults;
+		while (callresult2 < callresult) {
+			Py_DECREF(*callresult2);
+			++callresult2;
+		}
+		PyMem_Free(callresults);
+	}
+	if (abuffer)
+		PyMem_Free(abuffer);
+	return NULL;
+}
+
+#undef appendstring
+
+PyObject *
+PyUnicode_FromFormat(const char *format, ...)
+{
+	PyObject* ret;
+	va_list vargs;
+
+#ifdef HAVE_STDARG_PROTOTYPES
+	va_start(vargs, format);
+#else
+	va_start(vargs);
+#endif
+	ret = PyUnicode_FromFormatV(format, vargs);
+	va_end(vargs);
+	return ret;
+}
+
 Py_ssize_t PyUnicode_AsWideChar(PyUnicodeObject *unicode,
 				wchar_t *w,
 				Py_ssize_t size)

setup.py

@@ -420,6 +420,8 @@ class PyBuildExt(build_ext):
         exts.append( Extension("_heapq", ["_heapqmodule.c"]) )
         # operator.add() and similar goodies
         exts.append( Extension('operator', ['operator.c']) )
+        # Python 3.0 _fileio module
+        exts.append( Extension("_fileio", ["_fileio.c"]) )
         # _functools
         exts.append( Extension("_functools", ["_functoolsmodule.c"]) )
         # Python C API test module