Print strerror of negated return values after failed usb_bulk_write/read.

Signed-off-by: Matt Colyer <matt@colyer.name>

1 files changed, 5 insertions, 4 deletions

diff --git a/src/iphone.c b/src/iphone.c
index 6833e4c..5aefbf6 100644
--- a/src/iphone.c
+++ b/src/iphone.c
@@ -87,14 +87,15 @@ iPhone *get_iPhone() {
         if (bytes < 20 && debug) {
                 printf("get_iPhone(): libusb did NOT send enough!\n");
                 if (bytes < 0) {
-                        printf("get_iPhone(): libusb gave me the error: %s\n", usb_strerror());
+                        printf("get_iPhone(): libusb gave me the error %d: %s (%s)\n",
+                                        bytes, usb_strerror(), strerror(-bytes));
                 }
         }
         bytes = usb_bulk_read(phone->device, BULKIN, (char*)version, sizeof(*version), 800);
         if (bytes < 20) {
                 free_iPhone(phone);
                 if (debug) printf("get_iPhone(): Invalid version message -- header too short.\n");
-                if (debug && bytes < 0) printf("get_iPhone(): libusb error message: %s\n", usb_strerror());
+                if (debug && bytes < 0) printf("get_iPhone(): libusb error message %d: %s (%s)\n", usb_strerror(), strerror(-bytes));
                 return NULL;
         } else { 
                 if (ntohl(version->major) == 1 && ntohl(version->minor) == 0) {
@@ -149,7 +150,7 @@ int send_to_phone(iPhone *phone, char *data, int datalen) {
         if (debug) printf("noooo...?\n");
         if (bytes < datalen) {
                 if(debug && bytes < 0)
-                        printf("send_to_iphone(): libusb gave me the error: %s\n", usb_strerror());
+                        printf("send_to_iphone(): libusb gave me the error %d: %s\n", bytes, usb_strerror(), strerror(-bytes));
                 return -1;
         } else {
                 return bytes;
@@ -173,7 +174,7 @@ int recv_from_phone(iPhone *phone, char *data, int datalen) {
         bytes = usb_bulk_read(phone->device, BULKIN, data, datalen, 3500);
         if(bytes < 0)
         {
-                if(debug) printf("recv_from_iphone(): libusb gave me the error: %s\n", usb_strerror());
+                if(debug) printf("recv_from_iphone(): libusb gave me the error %d: %s (%s)\n", bytes, usb_strerror(), strerror(-bytes));
                 return -1;
         }
         return bytes;