IFDPowerICC(): allow to use NULL for pucAtr and pdwAtrLen to make power

down easy with IFDPowerICC(rContext, IFD_POWER_DOWN, NULL, NULL);


git-svn-id: svn:https://anonscm.debian.org/svn/pcsclite/trunk/PCSC@5314 0ce88b0d-b2fd-0310-8134-9614164e65ea

src/ifdwrapper.c

@@ -333,6 +333,8 @@ LONG IFDPowerICC(READER_CONTEXT * rContext, DWORD dwAction,
 #endif
  DWORD dwStatus;
  UCHAR ucValue[1];
+ UCHAR dummyAtr[MAX_ATR_SIZE];
+ DWORD dummyAtrLen = sizeof(dummyAtr);
 
 #ifndef PCSCLITE_STATIC_DRIVER
  RESPONSECODE(*IFD_power_icc) (DWORD) = NULL;
@@ -346,6 +348,11 @@ LONG IFDPowerICC(READER_CONTEXT * rContext, DWORD dwAction,
  dwStatus = 0;
  ucValue[0] = 0;
 
+ if (NULL == pucAtr)
+ pucAtr = dummyAtr;
+ if (NULL == pdwAtrLen)
+ pdwAtrLen = &dummyAtrLen;
+
  /*
  * Check that the card is inserted first
  */