Description of problem:

If the current locale is Turkish, setting a new locale fails if
the locale contains an 'I'.


Steps to Reproduce:

Compile and run:

#include <stdio.h>
#include <locale.h>
int
main(void)
{
    char *s;
    printf("%s\n", setlocale(LC_CTYPE, "tr_TR"));
    printf("%s\n", setlocale(LC_CTYPE, NULL));
    s = setlocale(LC_CTYPE, "tr_TR.ISO8859-9");
    printf("%s\n", s ? s : "null");
    return 0;
}

  
Actual results:

[stefan@fedora-14-amd64 ~]$ ./xxx 
tr_TR
tr_TR
null


Expected results:

tr_TR
tr_TR
tr_TR.ISO8859-9


Additional info:

My guess is that somewhere tolower() fails to convert the 'I'
to a proper lowercase 'i' if LC_CTYPE is Turkish.

This issue currently causes failures in the Fedora buildbot for
the Python project:

http://www.python.org/dev/buildbot/all/builders/AMD64%20Fedora%20without%20threads%203.x/builds/457/steps/test/logs/stdio

======================================================================
ERROR: test_getsetlocale_issue1813 (test.test_locale.TestMiscellaneous)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/test/test_locale.py", line 406, in test_getsetlocale_issue1813
    locale.setlocale(locale.LC_CTYPE, loc)
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/locale.py", line 538, in setlocale
    return _setlocale(category, locale)
locale.Error: unsupported locale setting

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


See also: http://bugs.python.org/issue1813