On Thu, Jan 29, 2004 at 02:53:21PM -0000, Simon Marlow wrote:
After Googling around a bit, I found this description of exactly how Windows interprets command lines in the C runtime:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng /htm/progs_12.asp
As you can see, the rules are indeed very strange,
Very strange indeed.
but they are invertible. I think this code should do the trick:
translate :: String -> String translate str = '"' : snd (foldr escape (True,"\"") str) where escape '"' (_, str) = (True, '\\' : '"' : str) escape '\\' (True, str) = (True, '\\' : '\\' : str) escape '\\' (False, str) = (False, '\\' : str) escape c (_, str) = (False, c : str)
Neat. If I understand the specs correctly, the following should also work. translate str = '"' : foldr escape ('"':[]) str where escape '"' t = '\\':'"':t escape '\\' t = '\\':'\\':'"':'"':t escape c t = c:t Who is going to write the unit test for that? And assuming both of our solutions satisfy the specs, which one will work for more versions of Windows? :-) Greetings, Carsten -- Carsten Schultz (2:38, 33:47), FB Mathematik, FU Berlin http://carsten.codimi.de/ PGP/GPG key on the pgp.net key servers, fingerprint on my home page.