On 13/01/2016 9:48 PM, David Macek wrote:
> On 13. 1. 2016 12:47, Andrew Lowe wrote:
>> On 13/01/2016 7:08 PM, Paul Moore wrote:
>>> On 13 January 2016 at 10:57, Andrew Lowe <[email protected]> wrote:
>>>> /* * Activity Name:
>> [snip]
>>
>>>> -----------------------------
>>>>
>>>> I've compiled this using the latest, as of a week ago, versions
>>>> of both clang and gcc and the behaviour is the same.
>>>
>>> This appears to be a buffering issue. When you write to stdout,
>>> the data is buffered. You could try adding a fflush(stdout) just
>>> before your scanf call. See
>>> http://stackoverflow.com/questions/3723795/is-stdout-line-buffered-unbuffered-or-indeterminate-by-default
>>>
>>>
>>
>>>
for a discussion.
>>>
>>> Paul
>>>
>> Thanks for the thought but that's not going to work. I can't go
>> placing more road blocks in front of the students. It's hard enough
>> as it is to get them to do/understand what's going on without
>> adding fflush() to the mix.
>>
>> I just need the same behaviour as cmd.exe and bash under Linux. Is
>> there something in Mintty/bash that I can "turn on/off"?
>
> See either <https://code.google.com/p/mintty/issues/detail?id=218> or
> <https://github.com/mintty/mintty/issues/218>.
>
> The proposed `winpty ./a.exe` works.
See my just previous comment
>
> I googled for a way to disable output buffering without changing the
> program code and only idea that showed some promise was a DLL
> injector that would automatically hook all child processes of mintty
> and call `fflush` (periodically) or `setvbuf` (at the right moment
> after stream set-up) on their behalf.
>
I had a look at the mintty bug you referenced and that offers a glimmer
of hope. I have placed the line in my app and it fixes the problem. I
have had the students create a template file, which was basically my
original example code without the printf() and scanf() which sits in the
root of their work dir. Whenever they start a new app, they create it
from this template, "cp ../template.c assign04.c". I can place the call
to setvbuf() in the template and tell the students it has to be there
and DON'T TOUCH.
I usually use Linux or the "graphical" front end of Windows so I'm
still finding my feet with this "Command line stuff under Windows" type
of thing. Is ConEmu similar to mintty? If it is, is it worth my while
trying to see if it solves the problem?
Regards,
Andrew
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