This is the mail archive of the cygwin mailing list for the Cygwin project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: CR-LF handling behavior of SED changed recently - this breaks a lot of MinGW cross build scripts

On 6/13/2017 1:34 PM, Brian Inglis wrote:
> On 2017-06-13 08:11, cyg Simple wrote:
>> 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.  "wt" 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 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:
>> 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.
> There's no need for open mode "t", as text is the default mode unless
> "b" is specified, and assuming you use "cooked" line I/O functions like
> fgets/fputs, not "raw" binary I/O like fread/fwrite; fscanf ignores all
> line terminators unless you use formats like "%c" which could see them.

That isn't exactly true based on the MSDN[1] the "t" manages the CTRL-Z
EOF marker.  However, I agree that it worthless.  But regardless the C
standard states that "t" or whatever extra character can be added and
left to the implementing library to interpret or ignored.  If the C
runtime library doesn't use it or ignore it then it isn't complying to
the C standard.


Open in text (translated) mode. In this mode, CTRL+Z is interpreted as
an EOF character on input. In files that are opened for reading/writing
by using "a+", fopen checks for a CTRL+Z at the end of the file and
removes it, if it is possible. This is done because using fseek and
ftell to move within a file that ends with CTRL+Z may cause fseek to
behave incorrectly near the end of the file."

cyg Simple

Problem reports:
Unsubscribe info:

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]