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Re: textmode for stdout, what is "correct" now?




On Feb 15 08:56, Michael Haubenwallner wrote:
> On 2/14/19 5:20 PM, Corinna Vinschen wrote:
> > On Feb 14 16:23, Michael Haubenwallner wrote:
> >> Hi,
> >>
> >> so I find myself struggling with textmode versus binmode for stdio again.
> >>
> >> Running the openssl command (from within the apps/ build directory here) does
> >> yield different results regarding carriage return depending on the version:
> >>
> >> $ ./apps/openssl version
> >> OpenSSL 1.0.2p  14 Aug 2018
> >> $ ./apps/openssl x509 -hash -noout -in /etc/pki/tls/cert.pem | xxd
> >> 00000000: 6139 3464 3039 6535 0a                   a94d09e5.
> >>
> >>
> >> $ ./apps/openssl version
> >> OpenSSL 1.1.0j  20 Nov 2018
> >> $ ./apps/openssl x509 -hash -noout -in /etc/pki/tls/cert.pem | xxd
> >> 00000000: 6139 3464 3039 6535 0d0a                 a94d09e5..
> >>
> >> Some subsequent shell script does create wrong symlink filenames
> >> (with embedded CR) when used with openssl-1.1.x.
> >>
> >> The commit that changed this behaviour in openssl-1.1 is:
> >> https://github.com/openssl/openssl/commit/bdd58d98467e9f0f6635c1628e1eae304383afb1
> >>
> >> >From an openssl developer's point of view, I can understand to set
> >> textmode when the intent is to output some text, and to set
> >> binmode when the intent is to output some binary data.
> > 
> > How do you create \r\n in this case?  The upstream patch never
> > adds the explicit 't' flag.  It only adds 'b' or nothing.  So
> > the output should be \n only unless you write to a file on a
> > text mode mount.  What am I missing?
> 
> Down the line in their BIO module they do use setmode(fd, O_TEXT),
> which is the one that does introduce the \r, as far as I know.

This one is not so nice.  Somebody should tell upstream we only
want explicit O_BINARY these days, but no explicit O_TEXT.

> The backtrace in openssl-1.1.1a in this use case is:
> [...]
> >> Question now is: These days, what is the correct way to handle this?

Telling upstream not to use O_TEXT on Cygwin in the first place, I think.

For scripting, d2u should help.


Corinna

-- 
Corinna Vinschen
Cygwin Maintainer

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