1 files changed, 115 insertions, 21 deletions

diff --git a/src/main.c b/src/main.c
index f1dfada..bef94b1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,15 +2,105 @@
 #include "video/interface.h"
 #include <unistd.h>
 #include "cpu/6502.h"
+#include "string.h"
 
 
-int main() {
+#define HelpPrintout "\
+Usage: apple-c [ options ]\n\
+An Apple-I emulator written in C.\n\
+\n\
+Options:\n\
+ -m, --memory [NUM]  Set RAM memory size to NUM pages; one page is 1024 bytes.\n\
+                     Value must be between 4-64. 4 is the default.\n\
+ -t, --terminal      Use ncurses (terminal) display mode. Default mode.\n\
+ -g, --graphical     Use SDL (graphical) display mode.\n\
+ -i, --information   Turn information overlay (default off).\n\
+ -l, --logging       Toggle logging of computer state every cycle (default off).\n\
+"
 
-	AppleOn();
+int main(int argc, char* argv[]) {
+
+	int print_info = 0;
+	int logging = 0;
+	int memory = 4;
+
+	//
+	// ARGUMENT PARSING
+	//
+
+	for (int i = 1; i < argc; i++) {
+
+		// Help
+
+		if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
+			// Print help and terminate straight away.
+			printf(HelpPrintout);
+			exit(0);
+		}
+
+		// Memory
+
+		if (!strcmp(argv[i], "-m") || !strcmp(argv[i], "--memory")) {
+			// Increment i, and check bounds.
+			if (++i >= argc) {
+				printf("Memory argument not set.\n");
+				exit(1);
+			}
+			// If able, get next argument, and set memory to it.
+			else {
+				memory = strtol(argv[i], NULL, 10);
+				if ((4 > memory) || (memory > 64)) {
+					printf("Invalid value for setting memory.\n");
+					exit(1);
+				}
+			}
+			goto SkipIteration;
+		}
+		
+		// Display
+		
+		if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--terminal")) {
+			SetDisplayMode(0);
+			goto SkipIteration;
+		}
+
+		if (!strcmp(argv[i], "-g") || !strcmp(argv[i], "--graphical")) {
+			SetDisplayMode(1);
+			goto SkipIteration;
+		}
+
+		// Logging
+
+		if (!strcmp(argv[i], "-l") || !strcmp(argv[i], "--information")) {
+			logging = 1;
+			goto SkipIteration;
+		}
+		
+		// Information Display
+
+		if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--information")) {
+			print_info = 1;
+			goto SkipIteration;
+		}
+		
+		printf("Unrecognized arguments.\n");
+		exit(1);
+	SkipIteration:
+	}
+
+	//
+	// EMULATION
+	//
+	
+	AppleOn(memory);
 	
 	DisplayInit();
 
-	FILE *Log = fopen("log/log.raw", "w+");
+	FILE *Log;
+	if (logging) {
+		Log = fopen("log/log.raw", "w+");
+	}
+	
 	int Time = 0;
 	
 	while(1) {
@@ -18,27 +108,31 @@ int main() {
 		CallInstructionTable();
 
 		// Logging
-		if (Time >= 0x2000)
-			// Stop logging after an arbitrary amount of time, so as to not create a huge file.
-			fclose(Log);
-		else {
-			fprintf(Log,
-				"%04x : %04x : %02x : %02x : %02x : %c%c_%c%c%c%c%c : %02x\n",
-				Time, PC, acc, X, Y,
-				GetFlag(flag_N) ? 'N':'.' ,
-				GetFlag(flag_V) ? 'V':'.' ,
-				GetFlag(flag_B) ? 'B':'.' ,
-				GetFlag(flag_D) ? 'D':'.' ,
-				GetFlag(flag_I) ? 'I':'.' ,
-				GetFlag(flag_Z) ? 'Z':'.' ,
-				GetFlag(flag_C) ? 'C':'.' ,
-				S);
-			fflush(Log);
-			Time++;
+		if (logging) {
+			if (Time >= 0x2000)
+				// Stop logging after an arbitrary amount of time, so as to not create a huge file.
+				fclose(Log);
+			else {
+				fprintf(Log,
+						"%04x : %04x : %02x : %02x : %02x : %c%c_%c%c%c%c%c : %02x\n",
+						Time, PC, acc, X, Y,
+						GetFlag(flag_N) ? 'N':'.' ,
+						GetFlag(flag_V) ? 'V':'.' ,
+						GetFlag(flag_B) ? 'B':'.' ,
+						GetFlag(flag_D) ? 'D':'.' ,
+						GetFlag(flag_I) ? 'I':'.' ,
+						GetFlag(flag_Z) ? 'Z':'.' ,
+						GetFlag(flag_C) ? 'C':'.' ,
+						S);
+				fflush(Log);
+				Time++;
+			}
 		}
 					
 		// Display information
-		PrintInfo();
+		if (print_info) {
+			PrintInfo();
+		}
 	}
 
 	DisplayClose();