command line arguments, cleanup

Makefile

@@ -1,7 +1,5 @@
 all:
-	gcc ./main.c -std=c99
-	./a.out
+	gcc ./main.c -std=c99 -o tasm
 
 d:
-	gcc -g -std=c99 ./main.c
-	gdb ./a.out
+	gcc -g -std=c99 ./main.c -o tasm

main.c

@@ -67,12 +67,36 @@ void asm_to_hex(char *_asm, int *opcode, int *in0, int *in1, int *out){
 }
 
 
-int main() {
-	FILE *dest_asm = fopen("assembly.txt", "w");
-	FILE *src_asm = fopen("src.asm", "r");
-	unsigned int size=0;
+int main(int argc, char **argv) {
 
-	fprintf(dest_asm,"00000\n");
+	FILE *dest_asm;
+	FILE *src_asm;
+	if (argc > 2) {
+		for (int i = 1 ; i < argc; i++) {
+			if (strcmp("-i", argv[i]) == 0 || strcmp("--input", argv[i]) == 0) {
+				src_asm = fopen(argv[i+1], "r");
+				i=i+1;
+			} else if (strcmp("-o", argv[i]) == 0 || strcmp("--output", argv[i]) == 0) {
+				dest_asm = fopen(argv[i+1], "w");
+				i=i+1;
+			} else if (strcmp("-h", argv[i]) == 0 || strcmp("--help", argv[i]) == 0) {
+				printf("Usage: tasm [options] file...\n");
+				printf("Options:\n");
+				printf("-h,--help		Prints this information\n");
+				printf("-i,--input <arg> 	Path of input file\n");
+				printf("-o,--output <arg>	Path of output file\n");
+				return 0; 
+			} else {
+				printf("unknown argument: %s\n", argv[i]);
+				return 1;
+			}
+		}
+	} else {
+		printf("tasm: no input file\n");
+		return 1;
+	}
+
+	unsigned int size=0; //keeps the size of the assembled program
 	char in_asm[64];
 	char out_asm[27];
 
@@ -81,10 +105,7 @@ int main() {
 	int hex_in1;
 	int hex_out;
 
-	fgets(in_asm, 64, src_asm);
-
-
-	while(!feof(src_asm)) {
+	while(fgets(in_asm, sizeof(in_asm), src_asm)) {
 		hex_op = 0;
 		hex_in0 = 0;
 		hex_in1 = 0;
@@ -101,7 +122,6 @@ int main() {
 		fprintf(dest_asm,"%.5x \n", hex_out);
 		// Write the hex to a file
 
-		fgets(in_asm, 64, src_asm);
 		size++;
 
 	}