add ykpiv_disconnect()

lib/ykpiv.c

@@ -57,10 +57,25 @@ ykpiv_rc ykpiv_init(ykpiv_state **state, int verbose) {
 }
 
 ykpiv_rc ykpiv_done(ykpiv_state *state) {
+  ykpiv_disconnect(state);
   free(state);
   return YKPIV_OK;
 }
 
+ykpiv_rc ykpiv_disconnect(ykpiv_state *state) {
+  if(state->card) {
+    SCardDisconnect(state->card, SCARD_RESET_CARD);
+    state->card = 0;
+  }
+
+  if(state->context) {
+    SCardReleaseContext(state->context);
+    state->context = 0;
+  }
+
+  return YKPIV_OK;
+}
+
 ykpiv_rc ykpiv_connect(ykpiv_state *state, const char *wanted) {
   unsigned long num_readers = 0;
   unsigned long active_protocol;

lib/ykpiv.h

@@ -58,6 +58,7 @@ extern "C"
 	ykpiv_rc ykpiv_init(ykpiv_state **state, int verbose);
 	ykpiv_rc ykpiv_done(ykpiv_state *state);
 	ykpiv_rc ykpiv_connect(ykpiv_state *state, const char *wanted);
+	ykpiv_rc ykpiv_disconnect(ykpiv_state *state);
 	ykpiv_rc ykpiv_transfer_data(ykpiv_state *state, const unsigned char *templ,
 			const unsigned char *in_data, long in_len,
 			unsigned char *out_data, unsigned long *out_len, int *sw);

lib/ykpiv.map

@@ -33,6 +33,7 @@ global:
 	ykpiv_init;
 	ykpiv_done;
 	ykpiv_connect;
+	ykpiv_disconnect;
 	ykpiv_send_data;
 	ykpiv_transfer_data;
 	ykpiv_authenticate;