Add command line options

diff --git a/src/mercenary/main.c b/src/mercenary/main.c
index 4057676..10d002a 100644 (file)
--- a/src/mercenary/main.c
+++ b/src/mercenary/main.c
@@ -77,6 +77,72 @@ static const char *home_dir;
 
 static int quit = 0;
 
+int parse_args(int argc, char *argv[])
+{
+       int i = 1;
+
+       while (argc > i) {
+               if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
+                       printf("Usage: %s\n", argv[0]);
+                       printf(" -s --amiga-speed original | full\n");
+                       printf("        Set speed of rendering to original Amiga or full speed.\n");
+                       printf(" -v --video-filter on | off\n");
+                       printf("        Set video filter.\n");
+                       printf(" -a --audio-filter on | off\n");
+                       printf("        Set audio filter.\n");
+                       return -1;
+               } else
+               if (!strcmp(argv[i], "-s") || !strcmp(argv[i], "--amiga-speed")) {
+                       i++;
+                       if (argc == i) {
+missing_parameter:
+                               printf("Missing parameter, use '--help'!\n");
+                               return -1;
+                       }
+                       if (!strcmp(argv[i], "original"))
+                               config_amiga_speed = 1;
+                       else
+                       if (!strcmp(argv[i], "full"))
+                               config_amiga_speed = 0;
+                       else {
+illegal_parameter:
+                               printf("Illegal parameter, use '--help'!\n");
+                               return -1;
+                       }
+               } else
+               if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--video-filter")) {
+                       i++;
+                       if (argc == i)
+                               goto missing_parameter;
+                       if (!strcmp(argv[i], "on"))
+                               config_video_filter = 1;
+                       else
+                       if (!strcmp(argv[i], "off"))
+                               config_video_filter = 0;
+                       else
+                               goto illegal_parameter;
+               } else
+               if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--audio-filter")) {
+                       i++;
+                       if (argc == i)
+                               goto missing_parameter;
+                       if (!strcmp(argv[i], "on"))
+                               config_audio_filter = 1;
+                       else
+                       if (!strcmp(argv[i], "off"))
+                               config_audio_filter = 0;
+                       else
+                               goto illegal_parameter;
+               } else {
+                       printf("Illegal option '%s', use '--help'!\n", argv[i]);
+                       return -1;
+               }
+               i++;
+       }
+
+       return 0;
+}
+
 static void main_loop(void)
 {
        int had_first_irq = 0;
@@ -174,7 +240,7 @@ static void main_loop(void)
        }
 }
 
-int main(int __attribute__((unused)) argc, char *argv[])
+int main(int argc, char *argv[])
 {
        int rc;
        int sdl_sound_chunk;
@@ -183,6 +249,10 @@ int main(int __attribute__((unused)) argc, char *argv[])
        if (!home_dir)
                home_dir = "";
 
+       rc = parse_args(argc, argv);
+       if (rc)
+               return 0;
+
        /* allocate image */
        image = calloc(IMAGE_WIDTH * IMAGE_HEIGHT, 3);
        if (!image) {
@@ -251,14 +321,16 @@ int main(int __attribute__((unused)) argc, char *argv[])
        /* start cpu */
        reset_cpu();
 
-       printf("Welcome to Mercenary Reloaded!\n\n");
+       printf("**********************************\n");
+       printf("* Welcome to Mercenary Reloaded! *\n");
+       printf("**********************************\n\n");
        printf("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
        printf("Press CTRL + f to toggle full screen.\n");
        printf("Press CTRL + s to toggle rendering speed.\n");
        printf("Press CTRL + v to toggle video filter.\n");
        printf("Press CTRL + a to toggle audio filter.\n");
-       printf("Press CTRL + c to exit game.\n");
-       printf("\n");
+       printf("Press CTRL + c to exit game.\n\n");
+       printf("Use '--help' as command line option for configuration settings.\n\n");
 
        /* run game */
        main_loop();