From ba28d817fbb38725cd5bcc5fe3c3c4d45ddfeace Mon Sep 17 00:00:00 2001
From: Romain Vimont <rom@rom1v.com>
Date: Sat, 1 Jan 2022 17:28:27 +0100
Subject: [PATCH] Fail on unsupported HID option

If the feature is not supported on the platform, fail during command
line parsing instead of using a fallback.
---
 app/src/cli.c    |  6 ++++++
 app/src/scrcpy.c | 11 ++++-------
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/app/src/cli.c b/app/src/cli.c
index f1f50049..b420996c 100644
--- a/app/src/cli.c
+++ b/app/src/cli.c
@@ -1300,7 +1300,13 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                 args->help = true;
                 break;
             case 'K':
+#ifdef HAVE_AOA_HID
                 opts->keyboard_input_mode = SC_KEYBOARD_INPUT_MODE_HID;
+#else
+                LOGE("HID over AOA (-K/--hid-keyboard) is not supported on "
+                     "this platform. It is only available on Linux.");
+                return false;
+#endif
                 break;
             case OPT_MAX_FPS:
                 if (!parse_max_fps(optarg, &opts->max_fps)) {
diff --git a/app/src/scrcpy.c b/app/src/scrcpy.c
index 9c2bd03b..3a271ee5 100644
--- a/app/src/scrcpy.c
+++ b/app/src/scrcpy.c
@@ -534,8 +534,8 @@ scrcpy(struct scrcpy_options *options) {
     struct sc_mouse_processor *mp = NULL;
 
     if (options->control) {
-        if (options->keyboard_input_mode == SC_KEYBOARD_INPUT_MODE_HID) {
 #ifdef HAVE_AOA_HID
+        if (options->keyboard_input_mode == SC_KEYBOARD_INPUT_MODE_HID) {
             bool aoa_hid_ok = false;
 
             bool ok = sc_aoa_init(&s->aoa, serial, acksync);
@@ -566,13 +566,10 @@ aoa_hid_end:
                      "(-K/--hid-keyboard ignored)");
                 options->keyboard_input_mode = SC_KEYBOARD_INPUT_MODE_INJECT;
             }
-#else
-            LOGE("HID over AOA is not supported on this platform, "
-                 "fallback to default keyboard injection method "
-                 "(-K/--hid-keyboard ignored)");
-            options->keyboard_input_mode = SC_KEYBOARD_INPUT_MODE_INJECT;
-#endif
         }
+#else
+        assert(options->keyboard_input_mode != SC_KEYBOARD_INPUT_MODE_HID);
+#endif
 
         // keyboard_input_mode may have been reset if HID mode failed
         if (options->keyboard_input_mode == SC_KEYBOARD_INPUT_MODE_INJECT) {