308 lines
8.8 KiB
Python
308 lines
8.8 KiB
Python
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# -*- coding: utf-8 -*-
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# This module is based on the excellent work by Adam Bartoš who
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# provided a lot of what went into the implementation here in
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# the discussion to issue1602 in the Python bug tracker.
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#
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# There are some general differences in regards to how this works
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# compared to the original patches as we do not need to patch
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# the entire interpreter but just work in our little world of
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# echo and prmopt.
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import io
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import os
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import sys
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import zlib
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import time
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import ctypes
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import msvcrt
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from ._compat import _NonClosingTextIOWrapper, text_type, PY2
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from ctypes import byref, POINTER, c_int, c_char, c_char_p, \
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c_void_p, py_object, c_ssize_t, c_ulong, windll, WINFUNCTYPE
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try:
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from ctypes import pythonapi
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PyObject_GetBuffer = pythonapi.PyObject_GetBuffer
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PyBuffer_Release = pythonapi.PyBuffer_Release
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except ImportError:
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pythonapi = None
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from ctypes.wintypes import LPWSTR, LPCWSTR
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c_ssize_p = POINTER(c_ssize_t)
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kernel32 = windll.kernel32
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GetStdHandle = kernel32.GetStdHandle
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ReadConsoleW = kernel32.ReadConsoleW
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WriteConsoleW = kernel32.WriteConsoleW
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GetLastError = kernel32.GetLastError
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GetCommandLineW = WINFUNCTYPE(LPWSTR)(
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('GetCommandLineW', windll.kernel32))
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CommandLineToArgvW = WINFUNCTYPE(
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POINTER(LPWSTR), LPCWSTR, POINTER(c_int))(
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('CommandLineToArgvW', windll.shell32))
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STDIN_HANDLE = GetStdHandle(-10)
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STDOUT_HANDLE = GetStdHandle(-11)
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STDERR_HANDLE = GetStdHandle(-12)
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PyBUF_SIMPLE = 0
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PyBUF_WRITABLE = 1
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ERROR_SUCCESS = 0
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ERROR_NOT_ENOUGH_MEMORY = 8
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ERROR_OPERATION_ABORTED = 995
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STDIN_FILENO = 0
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STDOUT_FILENO = 1
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STDERR_FILENO = 2
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EOF = b'\x1a'
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MAX_BYTES_WRITTEN = 32767
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class Py_buffer(ctypes.Structure):
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_fields_ = [
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('buf', c_void_p),
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('obj', py_object),
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('len', c_ssize_t),
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('itemsize', c_ssize_t),
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('readonly', c_int),
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('ndim', c_int),
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('format', c_char_p),
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('shape', c_ssize_p),
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('strides', c_ssize_p),
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('suboffsets', c_ssize_p),
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('internal', c_void_p)
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]
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if PY2:
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_fields_.insert(-1, ('smalltable', c_ssize_t * 2))
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# On PyPy we cannot get buffers so our ability to operate here is
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# serverly limited.
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if pythonapi is None:
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get_buffer = None
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else:
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def get_buffer(obj, writable=False):
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buf = Py_buffer()
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flags = PyBUF_WRITABLE if writable else PyBUF_SIMPLE
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PyObject_GetBuffer(py_object(obj), byref(buf), flags)
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try:
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buffer_type = c_char * buf.len
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return buffer_type.from_address(buf.buf)
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finally:
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PyBuffer_Release(byref(buf))
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class _WindowsConsoleRawIOBase(io.RawIOBase):
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def __init__(self, handle):
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self.handle = handle
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def isatty(self):
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io.RawIOBase.isatty(self)
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return True
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class _WindowsConsoleReader(_WindowsConsoleRawIOBase):
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def readable(self):
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return True
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def readinto(self, b):
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bytes_to_be_read = len(b)
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if not bytes_to_be_read:
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return 0
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elif bytes_to_be_read % 2:
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raise ValueError('cannot read odd number of bytes from '
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'UTF-16-LE encoded console')
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buffer = get_buffer(b, writable=True)
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code_units_to_be_read = bytes_to_be_read // 2
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code_units_read = c_ulong()
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rv = ReadConsoleW(self.handle, buffer, code_units_to_be_read,
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byref(code_units_read), None)
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if GetLastError() == ERROR_OPERATION_ABORTED:
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# wait for KeyboardInterrupt
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time.sleep(0.1)
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if not rv:
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raise OSError('Windows error: %s' % GetLastError())
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if buffer[0] == EOF:
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return 0
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return 2 * code_units_read.value
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class _WindowsConsoleWriter(_WindowsConsoleRawIOBase):
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def writable(self):
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return True
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@staticmethod
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def _get_error_message(errno):
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if errno == ERROR_SUCCESS:
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return 'ERROR_SUCCESS'
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elif errno == ERROR_NOT_ENOUGH_MEMORY:
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return 'ERROR_NOT_ENOUGH_MEMORY'
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return 'Windows error %s' % errno
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def write(self, b):
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bytes_to_be_written = len(b)
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buf = get_buffer(b)
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code_units_to_be_written = min(bytes_to_be_written,
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MAX_BYTES_WRITTEN) // 2
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code_units_written = c_ulong()
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WriteConsoleW(self.handle, buf, code_units_to_be_written,
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byref(code_units_written), None)
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bytes_written = 2 * code_units_written.value
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if bytes_written == 0 and bytes_to_be_written > 0:
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raise OSError(self._get_error_message(GetLastError()))
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return bytes_written
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class ConsoleStream(object):
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def __init__(self, text_stream, byte_stream):
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self._text_stream = text_stream
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self.buffer = byte_stream
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@property
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def name(self):
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return self.buffer.name
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def write(self, x):
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if isinstance(x, text_type):
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return self._text_stream.write(x)
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try:
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self.flush()
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except Exception:
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pass
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return self.buffer.write(x)
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def writelines(self, lines):
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for line in lines:
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self.write(line)
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def __getattr__(self, name):
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return getattr(self._text_stream, name)
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def isatty(self):
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return self.buffer.isatty()
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def __repr__(self):
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return '<ConsoleStream name=%r encoding=%r>' % (
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self.name,
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self.encoding,
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)
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class WindowsChunkedWriter(object):
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"""
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Wraps a stream (such as stdout), acting as a transparent proxy for all
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attribute access apart from method 'write()' which we wrap to write in
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limited chunks due to a Windows limitation on binary console streams.
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"""
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def __init__(self, wrapped):
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# double-underscore everything to prevent clashes with names of
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# attributes on the wrapped stream object.
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self.__wrapped = wrapped
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def __getattr__(self, name):
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return getattr(self.__wrapped, name)
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def write(self, text):
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total_to_write = len(text)
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written = 0
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while written < total_to_write:
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to_write = min(total_to_write - written, MAX_BYTES_WRITTEN)
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self.__wrapped.write(text[written:written+to_write])
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written += to_write
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_wrapped_std_streams = set()
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def _wrap_std_stream(name):
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# Python 2 & Windows 7 and below
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if PY2 and sys.getwindowsversion()[:2] <= (6, 1) and name not in _wrapped_std_streams:
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setattr(sys, name, WindowsChunkedWriter(getattr(sys, name)))
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_wrapped_std_streams.add(name)
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def _get_text_stdin(buffer_stream):
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text_stream = _NonClosingTextIOWrapper(
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io.BufferedReader(_WindowsConsoleReader(STDIN_HANDLE)),
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'utf-16-le', 'strict', line_buffering=True)
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return ConsoleStream(text_stream, buffer_stream)
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def _get_text_stdout(buffer_stream):
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text_stream = _NonClosingTextIOWrapper(
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io.BufferedWriter(_WindowsConsoleWriter(STDOUT_HANDLE)),
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'utf-16-le', 'strict', line_buffering=True)
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return ConsoleStream(text_stream, buffer_stream)
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def _get_text_stderr(buffer_stream):
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text_stream = _NonClosingTextIOWrapper(
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io.BufferedWriter(_WindowsConsoleWriter(STDERR_HANDLE)),
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'utf-16-le', 'strict', line_buffering=True)
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return ConsoleStream(text_stream, buffer_stream)
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if PY2:
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def _hash_py_argv():
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return zlib.crc32('\x00'.join(sys.argv[1:]))
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_initial_argv_hash = _hash_py_argv()
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def _get_windows_argv():
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argc = c_int(0)
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argv_unicode = CommandLineToArgvW(GetCommandLineW(), byref(argc))
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argv = [argv_unicode[i] for i in range(0, argc.value)]
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if not hasattr(sys, 'frozen'):
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argv = argv[1:]
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while len(argv) > 0:
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arg = argv[0]
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if not arg.startswith('-') or arg == '-':
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break
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argv = argv[1:]
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if arg.startswith(('-c', '-m')):
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break
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return argv[1:]
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_stream_factories = {
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0: _get_text_stdin,
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1: _get_text_stdout,
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2: _get_text_stderr,
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}
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def _get_windows_console_stream(f, encoding, errors):
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if get_buffer is not None and \
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encoding in ('utf-16-le', None) \
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and errors in ('strict', None) and \
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hasattr(f, 'isatty') and f.isatty():
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func = _stream_factories.get(f.fileno())
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if func is not None:
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if not PY2:
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f = getattr(f, 'buffer', None)
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if f is None:
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return None
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else:
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# If we are on Python 2 we need to set the stream that we
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# deal with to binary mode as otherwise the exercise if a
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# bit moot. The same problems apply as for
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# get_binary_stdin and friends from _compat.
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msvcrt.setmode(f.fileno(), os.O_BINARY)
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return func(f)
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