BUG: WSALookupServiceNext Returns Incomplete Data (250461)

MORE INFORMATION

#include <stdio.h>      // Standard I/O
#include <winsock2.h>   // winsock 2.0
#include <svcguid.h>    // guids

int main(int argc, char * argv[])
{
  WSADATA wsaData;
  DWORD dwResult;
  HANDLE hLookup = 0;
  WSAQUERYSET lpRestrictions;
  GUID guid = SVCID_HOSTNAME;

  dwResult = WSAStartup(MAKEWORD(2,2), &wsaData);

  if (dwResult != 0)
    {
    printf("Cannot startup Winsock: %d\n", dwResult);
    exit(1);
    }

  ZeroMemory(&lpRestrictions, sizeof(WSAQUERYSET));
  lpRestrictions.dwSize = sizeof(WSAQUERYSET);
  lpRestrictions.lpServiceClassId = &guid;

  dwResult = WSALookupServiceBegin(&lpRestrictions, LUP_RETURN_NAME, &hLookup);
  if (dwResult != SOCKET_ERROR)
    {
    DWORD dwLength = 0;
    WSAQUERYSET * pqs = NULL;
    
    // 
    // picking an arbitrary value works fine 
    // 
    // UNCOMMENT below for success on Windows 2000
    // 
    // pqs = (WSAQUERYSET *) malloc(sizeof(WSAQUERYSET) + 100);
    // dwLength = sizeof(WSAQUERYSET) + 100;
    // 

    do
      {
      if (WSALookupServiceNext(hLookup, 0, &dwLength, pqs) != 0)
        dwResult = WSAGetLastError();
      else
        dwResult = 0;

      if (dwResult == WSAEFAULT)
        {
        if (pqs) 
          free(pqs);
        pqs = (WSAQUERYSET *) malloc(dwLength);
        if (!pqs)
          {
          printf("Could not allocate memory: %d\n", GetLastError());
          exit(2);
          }
        else          
          continue;
        }
      
      // output it since we have it now        
      if ((dwResult == 0) && (pqs))
        printf("%s\n", pqs->lpszServiceInstanceName);

      }
      while ((dwResult != WSA_E_NO_MORE) && (dwResult != WSAENOMORE));      
    
    // clean-up
    free(pqs);
    WSALookupServiceEnd(hLookup);
    }
  else
    {
    printf("Error on WSALookupServiceBegin: %d\n", WSAGetLastError());
    exit(3);
    }
  

  WSACleanup();

  return 0;
}