[PATCH libcacard 2/2] vreader: Handle read failure

[Jason Andryuk <jandryuk@xxxxxxxxx>]

If a command fails, card_status will not match VCARD_DONE.  That will
trigger the assert and abort the process.  Instead, handle VCARD_FAIL and
return an error in that case.  Client software can then deal with the
error, and we continue running to handle future commands.

This can be triggered by removing the physical smartcard mid-operation.

Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
---
 src/vreader.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/vreader.c b/src/vreader.c
index 2d8aa9f..148f65b 100644
--- a/src/vreader.c
+++ b/src/vreader.c
@@ -256,6 +256,7 @@ vreader_xfr_bytes(VReader *reader,
     VCardAPDU *apdu;
     VCardResponse *response = NULL;
     VCardStatus card_status;
+    VReaderStatus ret;
     unsigned short status;
     VCard *card = vreader_get_card(reader);
     int size;
@@ -279,14 +280,23 @@ vreader_xfr_bytes(VReader *reader,
                   response->b_sw2, response->b_len, response->b_total_len);
         }
     }
+    if (card_status == VCARD_FAIL) {
+        *receive_buf_len = 0;
+        ret = VREADER_NO_CARD;
+        goto exit;
+    }
+
     assert(card_status == VCARD_DONE && response);
     size = MIN(*receive_buf_len, response->b_total_len);
     memcpy(receive_buf, response->b_data, size);
     *receive_buf_len = size;
+    ret = VREADER_OK;
+
+ exit:
     vcard_response_delete(response);
     vcard_apdu_delete(apdu);
     vcard_free(card); /* free our reference */
-    return VREADER_OK;
+    return ret;
 }
 
 struct VReaderListStruct {
-- 
2.17.1

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