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Subject:	Re: CR-LF handling behavior of SED changed recently - this breaks a lot of MinGW cross build scripts
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From:	cyg Simple <cygsimple AT gmail DOT com>
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Date:	Tue, 13 Jun 2017 10:11:11 -0400
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On 6/10/2017 10:30 PM, Eric Blake wrote:
> On 06/10/2017 08:48 AM, cyg Simple wrote:
> 
>>
>> Uhm, 'wt' and 'wb' came from MS itself.
> 
> Not quite. fopen(,"wb") comes from POSIX.  "wb" is probably a microsoft
> extension, but it is certainly not in POSIX nor in glibc.
> 

I think it's a C standard so it should be in glibc.  It may be mentioned
in the POSIX standard as in support of the C standard.

>>  GNU GCC was adapted to allow it
> 
> Huh? It's not whether the compiler allows it, but whether libc allows
> it.  ALL libc that are remotely close to POSIX compliant support
> fopen(,"wb"), but only Windows platforms (and NOT glibc) support
> fopen(,"wt").
> 

Looking at http://www.cplusplus.com/reference/cstdio/fopen/ I see:

"If additional characters follow the sequence, the behavior depends on
the library implementation: some implementations may ignore additional
characters so that for example an additional "t" (sometimes used to
explicitly state a text file) is accepted."

There is also a lot of discussion about the topic at:

https://stackoverflow.com/questions/229924/difference-between-files-writen-in-binary-and-text-mode

As for glibc, it will just ignore the extra character but it allows the
use of "wt"; it just means nothing to that C runtime library. It does
aide in portable code though.

As for me conflating GCC with a C runtime - please forgive my lapse in
memory.

-- 
cyg Simple

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