From e7b4d2cddf76c95a5de81802e69f0d22484455ce Mon Sep 17 00:00:00 2001
From: Andreas Eversberg <jolly@eversberg.eu>
Date: Sat, 3 Mar 2018 22:43:52 +0100
Subject: [PATCH] Add command line options

---
 src/mercenary/main.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 76 insertions(+), 4 deletions(-)

diff --git a/src/mercenary/main.c b/src/mercenary/main.c
index 4057676..10d002a 100644
--- 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();
-- 
2.13.6