[Bug libc/649] New: printf("%.*s", str) bug in a Qt application, also sprintf(s, "%.*s", str) bug

["develop at durst dot de" <sourceware-bugzilla at sources dot redhat dot com>]

If the following program is built on SUSE LINUX 9.1 or newer then
the sprintf and printf calls result in an empty string to be written
if characters from ASCII 128-255 occur in the source string:
 
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <qapplication.h>
 
int main( int argc, char** argv )
{
  QApplication app( argc, argv ); // necessary to produce the bug
  char str[256], s[256];
  while (fgets(str, 250, stdin))
  {
    sprintf(s, "%.*s", 66, str);
    if (strncmp(s, str, 66))
      {
        printf("str: %.66s ", str);  // str not written
        printf("   strings differ, seems sprintf bug\n");
      }
    else
      printf("str: %.66s ", str);
  }
  return 0;
}
 
Build with: g++ test.cpp -o teste -I/usr/local/qt/include /usr/lib/libqt-mt.so.3
Run with: teste <test.txt
 
Contents of test.txt: 
test 75 24234 k ä 77
test 75 24234 k ö 77
test 75 24234 k ü 77
test 75 24234 k ß 77
test 75 24234 k Ä 77
test 75 24234 k Ö 77
test 75 24234 k Ü 77
test 75 24234 k ° 77
test 75 24234 k ± 77
test 75 24234 k ² 77
test 75 24234 k µ 77
test 75 24234 k ~ 77

-- 
           Summary:  printf("%.*s", str) bug in a Qt application, also
                    sprintf(s, "%.*s", str) bug
           Product: glibc
           Version: 2.3.3
            Status: NEW
          Severity: normal
          Priority: P1
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: develop at durst dot de
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-suse-linux
  GCC host triplet: i686-suse-linux
GCC target triplet: i686-suse-linux


http://sources.redhat.com/bugzilla/show_bug.cgi?id=649

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