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""" Win32 utilities. See also twisted.python.shortcut. @var O_BINARY: the 'binary' mode flag on Windows, or 0 on other platforms, so it may safely be OR'ed into a mask for os.open. """ from __future__ import division, absolute_import import re import os # http://msdn.microsoft.com/library/default.asp?url=/library/en-us/debug/base/system_error_codes.asp ERROR_FILE_NOT_FOUND = 2 ERROR_PATH_NOT_FOUND = 3 ERROR_INVALID_NAME = 123 ERROR_DIRECTORY = 267 O_BINARY = getattr(os, "O_BINARY", 0) class FakeWindowsError(OSError): """ Stand-in for sometimes-builtin exception on platforms for which it is missing. """ try: WindowsError = WindowsError except NameError: WindowsError = FakeWindowsError _cmdLineQuoteRe = re.compile(r'(\\*)"') _cmdLineQuoteRe2 = re.compile(r'(\\+)\Z') def cmdLineQuote(s): """ Internal method for quoting a single command-line argument. @param s: an unquoted string that you want to quote so that something that does cmd.exe-style unquoting will interpret it as a single argument, even if it contains spaces. @type s: C{str} @return: a quoted string. @rtype: C{str} """ quote = ((" " in s) or ("\t" in s) or ('"' in s) or s == '') and '"' or '' return quote + _cmdLineQuoteRe2.sub(r"\1\1", _cmdLineQuoteRe.sub(r'\1\1\\"', s)) + quote def quoteArguments(arguments): """ Quote an iterable of command-line arguments for passing to CreateProcess or a similar API. This allows the list passed to C{reactor.spawnProcess} to match the child process's C{sys.argv} properly. @param arglist: an iterable of C{str}, each unquoted. @return: a single string, with the given sequence quoted as necessary. """ return ' '.join([cmdLineQuote(a) for a in arguments]) class _ErrorFormatter(object): """ Formatter for Windows error messages. @ivar winError: A callable which takes one integer error number argument and returns an L{exceptions.WindowsError} instance for that error (like L{ctypes.WinError}). @ivar formatMessage: A callable which takes one integer error number argument and returns a C{str} giving the message for that error (like L{win32api.FormatMessage}). @ivar errorTab: A mapping from integer error numbers to C{str} messages which correspond to those erorrs (like I{socket.errorTab}). """ def __init__(self, WinError, FormatMessage, errorTab): self.winError = WinError self.formatMessage = FormatMessage self.errorTab = errorTab def fromEnvironment(cls): """ Get as many of the platform-specific error translation objects as possible and return an instance of C{cls} created with them. """ try: from ctypes import WinError except ImportError: WinError = None try: from win32api import FormatMessage except ImportError: FormatMessage = None try: from socket import errorTab except ImportError: errorTab = None return cls(WinError, FormatMessage, errorTab) fromEnvironment = classmethod(fromEnvironment) def formatError(self, errorcode): """ Returns the string associated with a Windows error message, such as the ones found in socket.error. Attempts direct lookup against the win32 API via ctypes and then pywin32 if available), then in the error table in the socket module, then finally defaulting to C{os.strerror}. @param errorcode: the Windows error code @type errorcode: C{int} @return: The error message string @rtype: C{str} """ if self.winError is not None: return self.winError(errorcode).strerror if self.formatMessage is not None: return self.formatMessage(errorcode) if self.errorTab is not None: result = self.errorTab.get(errorcode) if result is not None: return result return os.strerror(errorcode) formatError = _ErrorFormatter.fromEnvironment().formatError