1 files changed, 50 insertions, 42 deletions

diff --git a/tools/idevicepair.c b/tools/idevicepair.c
index f42f498..dda02ec 100644
--- a/tools/idevicepair.c
+++ b/tools/idevicepair.c
@@ -144,42 +144,50 @@ static void print_error_message(lockdownd_error_t err)
         }
 }
 
-static void print_usage(int argc, char **argv)
+static void print_usage(int argc, char **argv, int is_error)
 {
-        char *name = NULL;
-
-        name = strrchr(argv[0], '/');
-        printf("Usage: %s [OPTIONS] COMMAND\n", (name ? name + 1: argv[0]));
-        printf("\n");
-        printf("Manage host pairings with devices and usbmuxd.\n");
-        printf("\n");
-        printf("Where COMMAND is one of:\n");
-        printf("  systembuid   print the system buid of the usbmuxd host\n");
-        printf("  hostid       print the host id for target device\n");
-        printf("  pair         pair device with this host\n");
-        printf("  validate     validate if device is paired with this host\n");
-        printf("  unpair       unpair device with this host\n");
-        printf("  list         list devices paired with this host\n");
-        printf("\n");
-        printf("The following OPTIONS are accepted:\n");
-        printf("  -u, --udid UDID  target specific device by UDID\n");
+        char *name = strrchr(argv[0], '/');
+        fprintf(is_error ? stderr : stdout, "Usage: %s [OPTIONS] COMMAND\n", (name ? name + 1: argv[0]));
+        fprintf(is_error ? stderr : stdout,
+                "\n"
+                "Manage host pairings with devices and usbmuxd.\n"
+                "\n"
+                "Where COMMAND is one of:\n"
+                "  systembuid   print the system buid of the usbmuxd host\n"
+                "  hostid       print the host id for target device\n"
+                "  pair         pair device with this host\n"
+                "  validate     validate if device is paired with this host\n"
+                "  unpair       unpair device with this host\n"
+                "  list         list devices paired with this host\n"
+                "\n"
+                "The following OPTIONS are accepted:\n"
+                "  -u, --udid UDID  target specific device by UDID\n"
+        );
 #ifdef HAVE_WIRELESS_PAIRING
-        printf("  -w, --wireless   perform wireless pairing (see NOTE)\n");
-        printf("  -n, --network    connect to network device (see NOTE)\n");
+        fprintf(is_error ? stderr : stdout,
+                "  -w, --wireless   perform wireless pairing (see NOTE)\n"
+                "  -n, --network    connect to network device (see NOTE)\n"
+        );
 #endif
-        printf("  -d, --debug      enable communication debugging\n");
-        printf("  -h, --help       prints usage information\n");
-        printf("  -v, --version    prints version information\n");
+        fprintf(is_error ? stderr : stdout,
+                "  -d, --debug      enable communication debugging\n"
+                "  -h, --help       prints usage information\n"
+                "  -v, --version    prints version information\n"
+        );
 #ifdef HAVE_WIRELESS_PAIRING
-        printf("\n");
-        printf("NOTE: Pairing over network (wireless pairing) is only supported by Apple TV\n");
-        printf("devices. To perform a wireless pairing, you need to use the -w command line\n");
-        printf("switch. Make sure to put the device into pairing mode first by opening\n");
-        printf("Settings > Remotes and Devices > Remote App and Devices.\n");
+        fprintf(is_error ? stderr : stdout,
+                "\n"
+                "NOTE: Pairing over network (wireless pairing) is only supported by Apple TV\n"
+                "devices. To perform a wireless pairing, you need to use the -w command line\n"
+                "switch. Make sure to put the device into pairing mode first by opening\n"
+                "Settings > Remotes and Devices > Remote App and Devices.\n"
+        );
 #endif
-        printf("\n");
-        printf("Homepage:    <" PACKAGE_URL ">\n");
-        printf("Bug Reports: <" PACKAGE_BUGREPORT ">\n");
+        fprintf(is_error ? stderr : stdout,
+                "\n"
+                "Homepage:    <" PACKAGE_URL ">\n"
+                "Bug Reports: <" PACKAGE_BUGREPORT ">\n"
+        );
 }
 
 int main(int argc, char **argv)
@@ -223,12 +231,12 @@ int main(int argc, char **argv)
         while ((c = getopt_long(argc, argv, SHORT_OPTIONS, longopts, NULL)) != -1) {
                 switch (c) {
                 case 'h':
-                        print_usage(argc, argv);
+                        print_usage(argc, argv, 0);
                         exit(EXIT_SUCCESS);
                 case 'u':
                         if (!*optarg) {
                                 fprintf(stderr, "ERROR: UDID must not be empty!\n");
-                                print_usage(argc, argv);
+                                print_usage(argc, argv, 1);
                                 result = EXIT_FAILURE;
                                 goto leave;
                         }
@@ -280,7 +288,7 @@ int main(int argc, char **argv)
                         result = EXIT_SUCCESS;
                         goto leave;
                 default:
-                        print_usage(argc, argv);
+                        print_usage(argc, argv, 1);
                         result = EXIT_FAILURE;
                         goto leave;
                 }
@@ -291,15 +299,15 @@ int main(int argc, char **argv)
 #endif
 
         if ((argc - optind) < 1) {
-                printf("ERROR: You need to specify a COMMAND!\n");
-                print_usage(argc, argv);
+                fprintf(stderr, "ERROR: You need to specify a COMMAND!\n");
+                print_usage(argc, argv, 1);
                 result = EXIT_FAILURE;
                 goto leave;
         }
 
         if (wireless_pairing && use_network) {
-                printf("ERROR: You cannot use -w and -n together.\n");
-                print_usage(argc, argv);
+                fprintf(stderr, "ERROR: You cannot use -w and -n together.\n");
+                print_usage(argc, argv, 1);
                 result = EXIT_FAILURE;
                 goto leave;
         }
@@ -319,16 +327,16 @@ int main(int argc, char **argv)
         } else if (!strcmp(cmd, "systembuid")) {
                 op = OP_SYSTEMBUID;
         } else {
-                printf("ERROR: Invalid command '%s' specified\n", cmd);
-                print_usage(argc, argv);
+                fprintf(stderr, "ERROR: Invalid command '%s' specified\n", cmd);
+                print_usage(argc, argv, 1);
                 result = EXIT_FAILURE;
                 goto leave;
         }
 
         if (wireless_pairing) {
                 if (op == OP_VALIDATE || op == OP_UNPAIR) {
-                        printf("ERROR: Command '%s' is not supported with -w\n", cmd);
-                        print_usage(argc, argv);
+                        fprintf(stderr, "ERROR: Command '%s' is not supported with -w\n", cmd);
+                        print_usage(argc, argv, 1);
                         result = EXIT_FAILURE;
                         goto leave;
                 }