idevicedebug: Use getopt for option parsing

1 files changed, 89 insertions, 67 deletions

diff --git a/tools/idevicedebug.c b/tools/idevicedebug.c
index aa7a400..53e84b7 100644
--- a/tools/idevicedebug.c
+++ b/tools/idevicedebug.c
@@ -32,6 +32,7 @@
 #include <time.h>
 #include <unistd.h>
 #include <libgen.h>
+#include <getopt.h>
 
 #ifdef WIN32
 #include <windows.h>
@@ -173,28 +174,30 @@ static debugserver_error_t debugserver_client_handle_response(debugserver_client
         return dres;
 }
 
-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("Interact with the debugserver service of a device.\n");
-        printf("\n");
-        printf("Where COMMAND is one of:\n");
-        printf("  run BUNDLEID [ARGS...]\trun app with BUNDLEID and optional ARGS on device.\n");
-        printf("\n");
-        printf("The following OPTIONS are accepted:\n");
-        printf("  -u, --udid UDID\ttarget specific device by UDID\n");
-        printf("  -n, --network\t\tconnect to network device\n");
-        printf("      --detach\t\tdetach from app after launch, keeping it running\n");
-        printf("  -e, --env NAME=VALUE\tset environment variable NAME to VALUE\n");
-        printf("  -d, --debug\t\tenable communication debugging\n");
-        printf("  -h, --help\t\tprints usage information\n");
-        printf("  -v, --version\t\tprints version information\n");
-        printf("\n");
-        printf("Homepage:    <" PACKAGE_URL ">\n");
-        printf("Bug Reports: <" PACKAGE_BUGREPORT ">\n");
+        fprintf(is_error ? stderr : stdout, "Usage: %s [OPTIONS] COMMAND\n", (name ? name + 1: argv[0]));
+        fprintf(is_error ? stderr : stdout,
+                "\n" \
+                "Interact with the debugserver service of a device.\n" \
+                "\n" \
+                "Where COMMAND is one of:\n" \
+                "  run BUNDLEID [ARGS...]\trun app with BUNDLEID and optional ARGS on device.\n" \
+                "\n" \
+                "The following OPTIONS are accepted:\n" \
+                "  -u, --udid UDID\ttarget specific device by UDID\n" \
+                "  -n, --network\t\tconnect to network device\n" \
+                "      --detach\t\tdetach from app after launch, keeping it running\n" \
+                "  -e, --env NAME=VALUE\tset environment variable NAME to VALUE\n" \
+                "  -d, --debug\t\tenable communication debugging\n" \
+                "  -h, --help\t\tprints usage information\n" \
+                "  -v, --version\t\tprints version information\n" \
+                "\n" \
+                "Homepage:    <" PACKAGE_URL ">\n" \
+                "Bug Reports: <" PACKAGE_BUGREPORT ">\n"
+        );
 }
 
 int main(int argc, char *argv[])
@@ -220,6 +223,18 @@ int main(int argc, char *argv[])
         debugserver_command_t command = NULL;
         debugserver_error_t dres = DEBUGSERVER_E_UNKNOWN_ERROR;
 
+        int c = 0;
+        const struct option longopts[] = {
+                { "debug", no_argument, NULL, 'd' },
+                { "help", no_argument, NULL, 'h' },
+                { "udid", required_argument, NULL, 'u' },
+                { "network", no_argument, NULL, 'n' },
+                { "detach", no_argument, NULL, 1 },
+                { "env", required_argument, NULL, 'e' },
+                { "version", no_argument, NULL, 'v' },
+                { NULL, 0, NULL, 0 }
+        };
+
         /* map signals */
         signal(SIGINT, on_signal);
         signal(SIGTERM, on_signal);
@@ -228,32 +243,31 @@ int main(int argc, char *argv[])
         signal(SIGPIPE, SIG_IGN);
 #endif
 
-        /* parse command line arguments */
-        for (i = 1; i < argc; i++) {
-                if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--debug")) {
+        while ((c = getopt_long(argc, argv, "dhu:ne:v", longopts, NULL)) != -1) {
+                switch (c) {
+                case 'd':
                         debug_level++;
                         idevice_set_debug_level(debug_level);
-                        continue;
-                } else if (!strcmp(argv[i], "-u") || !strcmp(argv[i], "--udid")) {
-                        i++;
-                        if (!argv[i] || !*argv[i]) {
-                                print_usage(argc, argv);
-                                res = 0;
-                                goto cleanup;
+                        break;
+                case 'u':
+                        if (!*optarg) {
+                                fprintf(stderr, "ERROR: UDID must not be empty!\n");
+                                print_usage(argc, argv, 1);
+                                return 2;
                         }
-                        udid = argv[i];
-                        continue;
-                } else if (!strcmp(argv[i], "-n") || !strcmp(argv[i], "--network")) {
+                        udid = optarg;
+                        break;
+                case 'n':
                         use_network = 1;
-                        continue;
-                } else if (!strcmp(argv[i], "--detach")) {
+                        break;
+                case 1:
                         detach_after_start = 1;
-                        continue;
-                } else if (!strcmp(argv[i], "-e") || !strcmp(argv[i], "--env")) {
-                        i++;
-                        if (!argv[i] || (strlen(argv[i]) <= 1) || strchr(argv[i], '=') == NULL) {
-                                print_usage(argc, argv);
-                                res = 0;
+                        break;
+                case 'e':
+                        if (!*optarg || strchr(optarg, '=') == NULL) {
+                                fprintf(stderr, "ERROR: environment variables need to be specified as -e KEY=VALUE\n");
+                                print_usage(argc, argv, 1);
+                                res = 2;
                                 goto cleanup;
                         }
                         /* add environment variable */
@@ -261,50 +275,58 @@ int main(int argc, char *argv[])
                                 newlist = malloc((environment_count + 1) * sizeof(char*));
                         else
                                 newlist = realloc(environment, (environment_count + 1) * sizeof(char*));
-                        newlist[environment_count++] = strdup(argv[i]);
+                        newlist[environment_count++] = strdup(optarg);
                         environment = newlist;
-                        continue;
-                } else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
-                        print_usage(argc, argv);
+                        break;
+                case 'h':
+                        print_usage(argc, argv, 0);
                         res = 0;
                         goto cleanup;
-                } else if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--version")) {
+                        break;
+                case 'v':
                         printf("%s %s\n", TOOL_NAME, PACKAGE_VERSION);
                         res = 0;
                         goto cleanup;
-                } else if (!strcmp(argv[i], "run")) {
-                        cmd = CMD_RUN;
-
-                        i++;
-                        if (!argv[i]) {
-                                /* make sure at least the bundle identifier was provided */
-                                printf("Please supply the bundle identifier of the app to run.\n");
-                                print_usage(argc, argv);
-                                res = 0;
-                                goto cleanup;
-                        }
-                        /*  read bundle identifier */
-                        bundle_identifier = argv[i];
                         break;
-                } else {
-                        print_usage(argc, argv);
-                        res = 0;
-                        goto cleanup;
                 }
         }
 
-        if (environment) {
-                newlist = realloc(environment, (environment_count + 1) * sizeof(char*));
-                newlist[environment_count] = NULL;
-                environment = newlist;
+        argc -= optind;
+        argv += optind;
+
+        if (argc < 1) {
+                fprintf(stderr, "ERROR: Missing command.\n");
+                print_usage(argc+optind, argv-optind, 1);
+        }
+
+        if (!strcmp(argv[0], "run")) {
+                cmd = CMD_RUN;
+                if (argc < 2) {
+                        /* make sure at least the bundle identifier was provided */
+                        fprintf(stderr, "ERROR: Please supply the bundle identifier of the app to run.\n");
+                        print_usage(argc+optind, argv-optind, 1);
+                        res = 2;
+                        goto cleanup;
+                }
+                /*  read bundle identifier */
+                bundle_identifier = argv[1];
+                i = 1;
         }
 
         /* verify options */
         if (cmd == CMD_NONE) {
-                print_usage(argc, argv);
+                fprintf(stderr, "ERROR: Unsupported command specified.\n");
+                print_usage(argc+optind, argv-optind, 1);
+                res = 2;
                 goto cleanup;
         }
 
+        if (environment) {
+                newlist = realloc(environment, (environment_count + 1) * sizeof(char*));
+                newlist[environment_count] = NULL;
+                environment = newlist;
+        }
+
         /* connect to the device */
         ret = idevice_new_with_options(&device, udid, (use_network) ? IDEVICE_LOOKUP_NETWORK : IDEVICE_LOOKUP_USBMUX);
         if (ret != IDEVICE_E_SUCCESS) {