From: Simon Li (simon.li_at_[hidden])
Date: 2005-06-02 11:25:39
> From: boost-bounces_at_[hidden]
> [mailto:boost-bounces_at_[hidden]] On Behalf Of Beman Dawes
> A fix for both issues would be to introduce an escape
> sequence which means "slash and I really mean it", or an
> escape path prefix which means "don't modify this path in any way."
> Both of those seem like ugly warts, and I've been avoiding
> them until someone comes up with a compelling use case. I
> would hate to do something ugly that may have no practical
> use whatsoever.
> Hum... Gears clank in brain for awhile...
> In the past, whenever I thought about escape sequences, I
> assumed we would have to invent a new escape sequence, and
> that would be quite messy. But what about hijacking one of
> the existing escape sequences?
> Of all the C++ escape sequences, '\a' stands for BEL, and
> would seem to have the least probability of ever being a
> valid character in a path. It isn't valid at all for some
> OS's. If Boost.Filesystem hijacked it as an escape sequence
> meaning ""slash and I really mean it", we could use option
> (2) with all its advantages, yet if someone desperately needs
> more slashes for whatever reason, they have a way of doing so.
In the unlikely event that there is a filename with a BEL in it, is
there a way of "unescaping" the \a so that it isn't converted into a
If anyone's wondering about BEL being a valid filename character, I've
just done a quick test on Linux:
[0 simon_at_cstux test]$ mkdir `echo -e 'foo\abar'`
# The stuff with echo ensures the argument passed to mkdir is a
[0 simon_at_cstux test]$ ls
[0 simon_at_cstux test]$ ls | od -a
0000000 f o o bel b a r nl
# od -e converts its raw input into ascii chars, or their
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