[Bug libc/14586] New: sscanf: "%[^a]s %s" stopped working

["temp78593 at mutluit dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14586

             Bug #: 14586
           Summary: sscanf: "%[^a]s %s" stopped working
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: critical
          Priority: P2
         Component: libc
        AssignedTo: unassigned@sourceware.org
        ReportedBy: temp78593@mutluit.com
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


#include <cstdio>
#include <cstdlib>
int main()
  {
    const char*    psz = " PROTO=TCP SPT=6004 DPT=26532 ";

    char           szProto[256] = "";
    unsigned short usSrcPort = 0, usDstPort = 0;
    const int c = sscanf(psz, " PROTO=%255[^ \t\n]s SPT=%hu DPT=%hu",
                                 szProto, &usSrcPort, &usDstPort);
    printf("%s\n", c == 3 ? "OK" : "ERROR");
    //...

    return 0;
  }

It fills only the first field --> c=1 --> ERROR
This code was working fine in prev. compiler/library versions.
# g++ --version
g++ (Debian 4.7.1-7) 4.7.1

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