[ruby-core:30423] [Bug #3337] MS-DOS device names are identified as readable_real

Issue #3337 has been updated by caleb clausen.


I'm not certain that the above list is complete. Among other things, windows allows programs to define their own ms-dos device names using DefineDosDevice. It might be better (at least on windows) to query the system for the list of currently defined device names.

It appears that windows ce allows device names which begin with \$device\ or \$bus\.

Also, I'm puzzled by the fact that you require a / at the beginning of the device name, and allow . or / at the end. Microsoft's documentation only mentions allowing a : at the end.

I think this might be a better regexp to use (wince devices still not checked here, tho):
%r{\A(CON|PRN|AUX|NUL|COM[1-9]|LPT[1-9])([./:]?\z)}i

relevant pages on MSDN:

INFO: Understanding Device Names and Symbolic Links 
http://support.microsoft.com/kb/235128

Defining an MS-DOS Device Name
http://msdn.microsoft.com/en-us/library/aa363908(VS.85).aspx

DefineDosDevice Function
http://msdn.microsoft.com/en-us/library/aa363904(VS.85).aspx

Device File Names (for windows ce)
http://msdn.microsoft.com/en-us/library/aa447463.aspx

QueryDosDevice Function (can return a list of known devices???)
http://msdn.microsoft.com/en-us/library/aa365461(v=VS.85).aspx
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