Add support for printing the transfer status

diff --git a/hmcfgusb.c b/hmcfgusb.c
index bcb85a4a75e2417e6c26fa73e1ce5c8824a2e416..b9b0f2347df0dd9b7b283e7004cd85ed014fbb4a 100644 (file)
--- a/hmcfgusb.c
+++ b/hmcfgusb.c
@@ -99,6 +99,28 @@ static char * usb_strerror(int e)
        return unknerr;
 }
 
+static char * usb_str_transfer_status(int e)
+{
+       static char unknerr[256];
+
+       switch (e) {
+               case LIBUSB_TRANSFER_COMPLETED:
+                       return "Transfer completed";
+               case LIBUSB_TRANSFER_ERROR:
+                       return "Transfer error";
+               case LIBUSB_TRANSFER_TIMED_OUT:
+                       return "Transfer timed out";
+               case LIBUSB_TRANSFER_CANCELLED:
+                       return "Transfer cancelled";
+               case LIBUSB_TRANSFER_STALL:
+                       return "No device";
+               case LIBUSB_TRANSFER_OVERFLOW:
+                       return "Transfer overflow";
+       };
+       snprintf(unknerr, sizeof(unknerr), "Unknown transfer status %d / 0x%02x", e, e);
+       return unknerr;
+}
+
 static libusb_device_handle *hmcfgusb_find(int vid, int pid, char *serial) {
        libusb_device_handle *devh = NULL;
        libusb_device **list;
@@ -279,7 +301,7 @@ static void LIBUSB_CALL hmcfgusb_interrupt(struct libusb_transfer *transfer)
        if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
                if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT) {
                        if (transfer->status != LIBUSB_TRANSFER_CANCELLED)
-                               fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_strerror(transfer->status));
+                               fprintf(stderr, "Interrupt transfer not completed: %s!\n", usb_str_transfer_status(transfer->status));
 
                        quit = EIO;
                        goto out;