locale "de_DE.UTF-8", fscanf problem?

locale "de_DE.UTF-8", fscanf problem?

[Tilman Kuepper]

Hello,

There seems to be an "unbalance" with fprintf and fscanf when using the 
"de_DE.UTF-8" locale.

The following program correctly writes "2,5" (decimal comma) to a file. But 
reading with fscanf fails - the decimal comma is treated as "end of number".

Regards,
Tilman

--------------

#include <locale.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    double test;
    setlocale(LC_NUMERIC, "de_DE.UTF-8");

    FILE* fp = fopen("test.txt", "w");
    fprintf(fp, "%f", 2.5);
    fclose(fp);

    printf("fprintf writes:\n");
    system("cat test.txt");

    fp = fopen("test.txt", "r");
    fscanf(fp, "%lf", &test);
    fclose(fp);

    printf("\nfscanf reads:\n%f\n", test);
    return 0;
}




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Re: locale "de_DE.UTF-8", fscanf problem?

[Corinna Vinschen]

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On Dec 17 10:09, Tilman Kuepper wrote:
> Hello,
> 
> There seems to be an "unbalance" with fprintf and fscanf when using
> the "de_DE.UTF-8" locale.
> 
> The following program correctly writes "2,5" (decimal comma) to a
> file. But reading with fscanf fails - the decimal comma is treated
> as "end of number".
> 
> Regards,
> Tilman
> 
> --------------
> [...testcase...]

Weird.  I was pretty sure that scanf is doing the right thing, but
apparently it doesn't.  Thanks a lot for the testcase, I'll have a look
into this issue.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: locale "de_DE.UTF-8", fscanf problem?

[Corinna Vinschen]

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On Dec 17 11:04, Corinna Vinschen wrote:
> On Dec 17 10:09, Tilman Kuepper wrote:
> > Hello,
> > 
> > There seems to be an "unbalance" with fprintf and fscanf when using
> > the "de_DE.UTF-8" locale.
> > 
> > The following program correctly writes "2,5" (decimal comma) to a
> > file. But reading with fscanf fails - the decimal comma is treated
> > as "end of number".
> > 
> > Regards,
> > Tilman
> > 
> > --------------
> > [...testcase...]
> 
> Weird.  I was pretty sure that scanf is doing the right thing, but
> apparently it doesn't.  Thanks a lot for the testcase, I'll have a look
> into this issue.

A generic solution for this problem is much more complex than I
anticipated.  I'll be looking into getting this into the next Cygwin
release, but it will take at least a couple of days to get this right,
so don't hold your breath for testing a fix within... uhm... the year
2013, I guess.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: locale "de_DE.UTF-8", fscanf problem?

[Corinna Vinschen]

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On Dec 17 17:49, Corinna Vinschen wrote:
> On Dec 17 11:04, Corinna Vinschen wrote:
> > On Dec 17 10:09, Tilman Kuepper wrote:
> > > Hello,
> > > 
> > > There seems to be an "unbalance" with fprintf and fscanf when using
> > > the "de_DE.UTF-8" locale.
> > > 
> > > The following program correctly writes "2,5" (decimal comma) to a
> > > file. But reading with fscanf fails - the decimal comma is treated
> > > as "end of number".
> > > 
> > > Regards,
> > > Tilman
> > > 
> > > --------------
> > > [...testcase...]
> > 
> > Weird.  I was pretty sure that scanf is doing the right thing, but
> > apparently it doesn't.  Thanks a lot for the testcase, I'll have a look
> > into this issue.
> 
> A generic solution for this problem is much more complex than I
> anticipated.  I'll be looking into getting this into the next Cygwin
> release, but it will take at least a couple of days to get this right,
> so don't hold your breath for testing a fix within... uhm... the year
> 2013, I guess.

I applied a newlib patch today.  Please give the next developer snapshot
from http://cygwin.com/snapshots/ a try.


Thanks,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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Re: locale "de_DE.UTF-8", fscanf problem?

[Tilman Kuepper]

> On Dec 17 17:49, Corinna Vinschen wrote:
> > On Dec 17 11:04, Corinna Vinschen wrote:
> > > On Dec 17 10:09, Tilman Kuepper wrote:
> > > > Hello,
> > > > 
> > > > There seems to be an "unbalance" with fprintf and fscanf when using
> > > > the "de_DE.UTF-8" locale.
> > > > 
> [...]
> 
> I applied a newlib patch today.  Please give the next developer snapshot
> from http://cygwin.com/snapshots/ a try.
> 
> Thanks,
> Corinna

Yes, it works, good job!  Thanks :-))

Happy New Year!
Tilman


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