[Bug libc/15736] New: mismatch between strcasecmp and toupper/tolower in tr_TR.iso88599 locale

["vincent-srcware at vinc17 dot net" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15736

            Bug ID: 15736
           Summary: mismatch between strcasecmp and toupper/tolower in
                    tr_TR.iso88599 locale
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: vincent-srcware at vinc17 dot net
                CC: drepper.fsp at gmail dot com

There is a mismatch between strcasecmp and toupper/tolower in the
tr_TR.iso88599 locale:

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

int main (void)
{
  int i, j, k;
  char *infs[] = { "INF", "inf" };

  if (setlocale (LC_ALL, "") == NULL)
    {
      fprintf (stderr, "locale-test: can't set locales\n");
      exit (EXIT_FAILURE);
    }

  for (i = 0; i < 2; i++)
    for (j = 0; j < 4; j++)
      {
        char s[4];
        for (k = 0; k < 3; k++)
          {
            s[k] = infs[i][k];
            if (j > k)
              s[k] = (i ? toupper : tolower)(s[k]);
          }
        s[3] = '\0';
        printf ("%d%d %s\n",
                !strcasecmp (s, "INF"), !strcasecmp (s, "inf"), s);
      }

  return 0;
}

gives:

11 INF
00 ÄNF
00 ÄnF
00 Änf
11 inf
00 Änf
00 ÄNf
00 ÄNF

Since the modifications of the string have been done with toupper and tolower,
I would have expected 11 everywhere.

Tested on Debian/unstable (amd64). Corresponding bug report:
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=716775

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