mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-12-29 17:01:44 +01:00
370 lines
9.8 KiB
Python
370 lines
9.8 KiB
Python
# -*- coding: utf-8 -*-
|
|
# This module is based on the excellent work by Adam Bartoš who
|
|
# provided a lot of what went into the implementation here in
|
|
# the discussion to issue1602 in the Python bug tracker.
|
|
#
|
|
# There are some general differences in regards to how this works
|
|
# compared to the original patches as we do not need to patch
|
|
# the entire interpreter but just work in our little world of
|
|
# echo and prmopt.
|
|
import ctypes
|
|
import io
|
|
import os
|
|
import sys
|
|
import time
|
|
import zlib
|
|
from ctypes import byref
|
|
from ctypes import c_char
|
|
from ctypes import c_char_p
|
|
from ctypes import c_int
|
|
from ctypes import c_ssize_t
|
|
from ctypes import c_ulong
|
|
from ctypes import c_void_p
|
|
from ctypes import POINTER
|
|
from ctypes import py_object
|
|
from ctypes import windll
|
|
from ctypes import WinError
|
|
from ctypes import WINFUNCTYPE
|
|
from ctypes.wintypes import DWORD
|
|
from ctypes.wintypes import HANDLE
|
|
from ctypes.wintypes import LPCWSTR
|
|
from ctypes.wintypes import LPWSTR
|
|
|
|
import msvcrt
|
|
|
|
from ._compat import _NonClosingTextIOWrapper
|
|
from ._compat import PY2
|
|
from ._compat import text_type
|
|
|
|
try:
|
|
from ctypes import pythonapi
|
|
|
|
PyObject_GetBuffer = pythonapi.PyObject_GetBuffer
|
|
PyBuffer_Release = pythonapi.PyBuffer_Release
|
|
except ImportError:
|
|
pythonapi = None
|
|
|
|
|
|
c_ssize_p = POINTER(c_ssize_t)
|
|
|
|
kernel32 = windll.kernel32
|
|
GetStdHandle = kernel32.GetStdHandle
|
|
ReadConsoleW = kernel32.ReadConsoleW
|
|
WriteConsoleW = kernel32.WriteConsoleW
|
|
GetConsoleMode = kernel32.GetConsoleMode
|
|
GetLastError = kernel32.GetLastError
|
|
GetCommandLineW = WINFUNCTYPE(LPWSTR)(("GetCommandLineW", windll.kernel32))
|
|
CommandLineToArgvW = WINFUNCTYPE(POINTER(LPWSTR), LPCWSTR, POINTER(c_int))(
|
|
("CommandLineToArgvW", windll.shell32)
|
|
)
|
|
LocalFree = WINFUNCTYPE(ctypes.c_void_p, ctypes.c_void_p)(
|
|
("LocalFree", windll.kernel32)
|
|
)
|
|
|
|
|
|
STDIN_HANDLE = GetStdHandle(-10)
|
|
STDOUT_HANDLE = GetStdHandle(-11)
|
|
STDERR_HANDLE = GetStdHandle(-12)
|
|
|
|
|
|
PyBUF_SIMPLE = 0
|
|
PyBUF_WRITABLE = 1
|
|
|
|
ERROR_SUCCESS = 0
|
|
ERROR_NOT_ENOUGH_MEMORY = 8
|
|
ERROR_OPERATION_ABORTED = 995
|
|
|
|
STDIN_FILENO = 0
|
|
STDOUT_FILENO = 1
|
|
STDERR_FILENO = 2
|
|
|
|
EOF = b"\x1a"
|
|
MAX_BYTES_WRITTEN = 32767
|
|
|
|
|
|
class Py_buffer(ctypes.Structure):
|
|
_fields_ = [
|
|
("buf", c_void_p),
|
|
("obj", py_object),
|
|
("len", c_ssize_t),
|
|
("itemsize", c_ssize_t),
|
|
("readonly", c_int),
|
|
("ndim", c_int),
|
|
("format", c_char_p),
|
|
("shape", c_ssize_p),
|
|
("strides", c_ssize_p),
|
|
("suboffsets", c_ssize_p),
|
|
("internal", c_void_p),
|
|
]
|
|
|
|
if PY2:
|
|
_fields_.insert(-1, ("smalltable", c_ssize_t * 2))
|
|
|
|
|
|
# On PyPy we cannot get buffers so our ability to operate here is
|
|
# serverly limited.
|
|
if pythonapi is None:
|
|
get_buffer = None
|
|
else:
|
|
|
|
def get_buffer(obj, writable=False):
|
|
buf = Py_buffer()
|
|
flags = PyBUF_WRITABLE if writable else PyBUF_SIMPLE
|
|
PyObject_GetBuffer(py_object(obj), byref(buf), flags)
|
|
try:
|
|
buffer_type = c_char * buf.len
|
|
return buffer_type.from_address(buf.buf)
|
|
finally:
|
|
PyBuffer_Release(byref(buf))
|
|
|
|
|
|
class _WindowsConsoleRawIOBase(io.RawIOBase):
|
|
def __init__(self, handle):
|
|
self.handle = handle
|
|
|
|
def isatty(self):
|
|
io.RawIOBase.isatty(self)
|
|
return True
|
|
|
|
|
|
class _WindowsConsoleReader(_WindowsConsoleRawIOBase):
|
|
def readable(self):
|
|
return True
|
|
|
|
def readinto(self, b):
|
|
bytes_to_be_read = len(b)
|
|
if not bytes_to_be_read:
|
|
return 0
|
|
elif bytes_to_be_read % 2:
|
|
raise ValueError(
|
|
"cannot read odd number of bytes from UTF-16-LE encoded console"
|
|
)
|
|
|
|
buffer = get_buffer(b, writable=True)
|
|
code_units_to_be_read = bytes_to_be_read // 2
|
|
code_units_read = c_ulong()
|
|
|
|
rv = ReadConsoleW(
|
|
HANDLE(self.handle),
|
|
buffer,
|
|
code_units_to_be_read,
|
|
byref(code_units_read),
|
|
None,
|
|
)
|
|
if GetLastError() == ERROR_OPERATION_ABORTED:
|
|
# wait for KeyboardInterrupt
|
|
time.sleep(0.1)
|
|
if not rv:
|
|
raise OSError("Windows error: {}".format(GetLastError()))
|
|
|
|
if buffer[0] == EOF:
|
|
return 0
|
|
return 2 * code_units_read.value
|
|
|
|
|
|
class _WindowsConsoleWriter(_WindowsConsoleRawIOBase):
|
|
def writable(self):
|
|
return True
|
|
|
|
@staticmethod
|
|
def _get_error_message(errno):
|
|
if errno == ERROR_SUCCESS:
|
|
return "ERROR_SUCCESS"
|
|
elif errno == ERROR_NOT_ENOUGH_MEMORY:
|
|
return "ERROR_NOT_ENOUGH_MEMORY"
|
|
return "Windows error {}".format(errno)
|
|
|
|
def write(self, b):
|
|
bytes_to_be_written = len(b)
|
|
buf = get_buffer(b)
|
|
code_units_to_be_written = min(bytes_to_be_written, MAX_BYTES_WRITTEN) // 2
|
|
code_units_written = c_ulong()
|
|
|
|
WriteConsoleW(
|
|
HANDLE(self.handle),
|
|
buf,
|
|
code_units_to_be_written,
|
|
byref(code_units_written),
|
|
None,
|
|
)
|
|
bytes_written = 2 * code_units_written.value
|
|
|
|
if bytes_written == 0 and bytes_to_be_written > 0:
|
|
raise OSError(self._get_error_message(GetLastError()))
|
|
return bytes_written
|
|
|
|
|
|
class ConsoleStream(object):
|
|
def __init__(self, text_stream, byte_stream):
|
|
self._text_stream = text_stream
|
|
self.buffer = byte_stream
|
|
|
|
@property
|
|
def name(self):
|
|
return self.buffer.name
|
|
|
|
def write(self, x):
|
|
if isinstance(x, text_type):
|
|
return self._text_stream.write(x)
|
|
try:
|
|
self.flush()
|
|
except Exception:
|
|
pass
|
|
return self.buffer.write(x)
|
|
|
|
def writelines(self, lines):
|
|
for line in lines:
|
|
self.write(line)
|
|
|
|
def __getattr__(self, name):
|
|
return getattr(self._text_stream, name)
|
|
|
|
def isatty(self):
|
|
return self.buffer.isatty()
|
|
|
|
def __repr__(self):
|
|
return "<ConsoleStream name={!r} encoding={!r}>".format(
|
|
self.name, self.encoding
|
|
)
|
|
|
|
|
|
class WindowsChunkedWriter(object):
|
|
"""
|
|
Wraps a stream (such as stdout), acting as a transparent proxy for all
|
|
attribute access apart from method 'write()' which we wrap to write in
|
|
limited chunks due to a Windows limitation on binary console streams.
|
|
"""
|
|
|
|
def __init__(self, wrapped):
|
|
# double-underscore everything to prevent clashes with names of
|
|
# attributes on the wrapped stream object.
|
|
self.__wrapped = wrapped
|
|
|
|
def __getattr__(self, name):
|
|
return getattr(self.__wrapped, name)
|
|
|
|
def write(self, text):
|
|
total_to_write = len(text)
|
|
written = 0
|
|
|
|
while written < total_to_write:
|
|
to_write = min(total_to_write - written, MAX_BYTES_WRITTEN)
|
|
self.__wrapped.write(text[written : written + to_write])
|
|
written += to_write
|
|
|
|
|
|
_wrapped_std_streams = set()
|
|
|
|
|
|
def _wrap_std_stream(name):
|
|
# Python 2 & Windows 7 and below
|
|
if (
|
|
PY2
|
|
and sys.getwindowsversion()[:2] <= (6, 1)
|
|
and name not in _wrapped_std_streams
|
|
):
|
|
setattr(sys, name, WindowsChunkedWriter(getattr(sys, name)))
|
|
_wrapped_std_streams.add(name)
|
|
|
|
|
|
def _get_text_stdin(buffer_stream):
|
|
text_stream = _NonClosingTextIOWrapper(
|
|
io.BufferedReader(_WindowsConsoleReader(STDIN_HANDLE)),
|
|
"utf-16-le",
|
|
"strict",
|
|
line_buffering=True,
|
|
)
|
|
return ConsoleStream(text_stream, buffer_stream)
|
|
|
|
|
|
def _get_text_stdout(buffer_stream):
|
|
text_stream = _NonClosingTextIOWrapper(
|
|
io.BufferedWriter(_WindowsConsoleWriter(STDOUT_HANDLE)),
|
|
"utf-16-le",
|
|
"strict",
|
|
line_buffering=True,
|
|
)
|
|
return ConsoleStream(text_stream, buffer_stream)
|
|
|
|
|
|
def _get_text_stderr(buffer_stream):
|
|
text_stream = _NonClosingTextIOWrapper(
|
|
io.BufferedWriter(_WindowsConsoleWriter(STDERR_HANDLE)),
|
|
"utf-16-le",
|
|
"strict",
|
|
line_buffering=True,
|
|
)
|
|
return ConsoleStream(text_stream, buffer_stream)
|
|
|
|
|
|
if PY2:
|
|
|
|
def _hash_py_argv():
|
|
return zlib.crc32("\x00".join(sys.argv[1:]))
|
|
|
|
_initial_argv_hash = _hash_py_argv()
|
|
|
|
def _get_windows_argv():
|
|
argc = c_int(0)
|
|
argv_unicode = CommandLineToArgvW(GetCommandLineW(), byref(argc))
|
|
if not argv_unicode:
|
|
raise WinError()
|
|
try:
|
|
argv = [argv_unicode[i] for i in range(0, argc.value)]
|
|
finally:
|
|
LocalFree(argv_unicode)
|
|
del argv_unicode
|
|
|
|
if not hasattr(sys, "frozen"):
|
|
argv = argv[1:]
|
|
while len(argv) > 0:
|
|
arg = argv[0]
|
|
if not arg.startswith("-") or arg == "-":
|
|
break
|
|
argv = argv[1:]
|
|
if arg.startswith(("-c", "-m")):
|
|
break
|
|
|
|
return argv[1:]
|
|
|
|
|
|
_stream_factories = {
|
|
0: _get_text_stdin,
|
|
1: _get_text_stdout,
|
|
2: _get_text_stderr,
|
|
}
|
|
|
|
|
|
def _is_console(f):
|
|
if not hasattr(f, "fileno"):
|
|
return False
|
|
|
|
try:
|
|
fileno = f.fileno()
|
|
except OSError:
|
|
return False
|
|
|
|
handle = msvcrt.get_osfhandle(fileno)
|
|
return bool(GetConsoleMode(handle, byref(DWORD())))
|
|
|
|
|
|
def _get_windows_console_stream(f, encoding, errors):
|
|
if (
|
|
get_buffer is not None
|
|
and encoding in ("utf-16-le", None)
|
|
and errors in ("strict", None)
|
|
and _is_console(f)
|
|
):
|
|
func = _stream_factories.get(f.fileno())
|
|
if func is not None:
|
|
if not PY2:
|
|
f = getattr(f, "buffer", None)
|
|
if f is None:
|
|
return None
|
|
else:
|
|
# If we are on Python 2 we need to set the stream that we
|
|
# deal with to binary mode as otherwise the exercise if a
|
|
# bit moot. The same problems apply as for
|
|
# get_binary_stdin and friends from _compat.
|
|
msvcrt.setmode(f.fileno(), os.O_BINARY)
|
|
return func(f)
|