More DOS friendly, report invalid options

1 files changed, 11 insertions, 5 deletions

diff --git a/src/main.c b/src/main.c
index 0b45bbe..bf37ff3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -22,9 +22,9 @@ int _crt0_startup_flags = _CRT0_FLAG_LOCK_MEMORY;
 static void run_help(const char *argv0)
 {
     printf("usage: %s\n\n"
-           "  -h\tthis help screen\n"
-           "  -v\tprint version and exit\n"
-           "  -ns\trun the game with no sound\n\n"
+           "  -h, /?  this help screen\n"
+           "  -v      print version and exit\n"
+           "  -ns     run the game with no sound\n\n"
            "More info and updates:\n\n"
            "  " GAME_URL "\n\n",
            argv0);
@@ -44,18 +44,24 @@ int main(int argc, char *argv[])
     if (argc > 1)
     {
         for (uint8_t i = 1; i < argc; i++)
-            if (!strcmp(argv[i], "-h"))
+            if (!strcmp(argv[i], "-h")
+                    || !strcmp(argv[i], "/?"))
             {
                 run_help(argv[0]);
                 return 0;
             }
             else if (!strcmp(argv[i], "-v"))
             {
-                printf(GAME_NAME " " GAME_VERSION "\n");
+                printf(GAME_NAME " version " GAME_VERSION "\n");
                 return 0;
             }
             else if (!strcmp(argv[i], "-ns"))
                 nosound = 1;
+            else
+            {
+                fprintf(stderr, "ERROR: invalid option, try -h\n");
+                return 1;
+            }
     }
 
     if (!sound_init(nosound))