1 files changed, 19 insertions, 0 deletions

diff --git a/src/ideviceinstaller.c b/src/ideviceinstaller.c
index 5758b46..59a6b38 100644
--- a/src/ideviceinstaller.c
+++ b/src/ideviceinstaller.c
@@ -330,6 +330,25 @@ static void parse_opts(int argc, char **argv)
                         break;
                 }
 
+                /* verify if multiple modes have been supplied */
+                switch (c) {
+                case 'l':
+                case 'i':
+                case 'g':
+                case 'L':
+                case 'a':
+                case 'r':
+                case 'R':
+                        if (cmd != CMD_NONE) {
+                                printf("ERROR: A mode has already been supplied. Multiple modes are not supported.\n");
+                                print_usage(argc, argv);
+                                exit(2);
+                        }
+                        break;
+                default:
+                        break;
+                }
+
                 switch (c) {
                 case 'h':
                         print_usage(argc, argv);