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Re: sed strips CRs

From: Paolo Bonzini
Subject: Re: sed strips CRs
Date: Mon, 13 Feb 2012 20:48:44 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20120131 Thunderbird/10.0

On 02/13/2012 08:42 PM, John Cowan wrote:
> By the way, I'm still opening the script file with "rt".  I cannot think
> of any case when you would want to keep CRs there.
You wouldn't, but the point is that "rt" isn't defined on Posix systems.
If it happens to be the same as "r", good, but that isn't guaranteed.

Yes, I added a configure-time check too. I assume that if "rt" works, it can be used instead of "r".

And the only time "rt" does anything different from "r" on a Win32 system
is when you have:

1) linked your executable with the system-supplied 'binmode.obj' file

2) set the global variable _fmode to O_BINARY

3) invoked _set_fmode(O_BINARY)

all of which make "r" synonymous with "rb".  Programs which don't do any
of these should use "r" rather than "rt", as it is guaranteed to do the
right thing for text on both Win32 and Posix systems.

No, "rt" also does something different than "r" on Cygwin with binary-mounts.

If you meant that "rt" should be restricted to cygwin, that's also fine by me but in general I prefer feature tests to OS tests.


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