command line arguments

src/main.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <assert.h>
 #include "tinyriscv.h"
 
 void regdump(const trv_cpu* cpu){
@@ -17,48 +18,60 @@ void help(void){
 	printf("  --help               Display this information.\n");
 	printf("  --bin <file>         Load <file> into memory.\n");
 	printf("  --mem_size <size>    Set memory to have <size> bytes.\n");
+	printf("  --regdump            Dump registers at execution halt.\n");
 
 	exit(0);
 }
 
 int main(int argc, char** argv){
-
+	char file_path[256] = "";
 	size_t mem_size = 4096;
+	unsigned int do_regdump = 0;
 
-	for(unsigned int i = 0; i < argc; i++){
-		if(!strcmp(argv[i], "--help")) help();
-			
-			else if(!strcmp(argv[i], "--mem_size")){
-			if(!argv[i + 1]){
-				printf("")		
-			}
-		} mem_size = atoi(argv[i + 1]);
-	}
-
+ 	//command line arguments
 	if(argc < 2){
-		//printf("USAGE: tinyricv <file_path>\n");
-		exit(0);
+		printf("Not enough arguments.\n");
+		help();
 	}
-
-	FILE* file = fopen(argv[1], "rb");
-	if(!file){
-		perror("ERROR: Can't open file: ");
-		exit(-1);
+	for(unsigned int i = 1; i < argc; i++){
+		if(!strcmp(argv[i], "--help")) help();
+		else if(!strcmp(argv[i], "--bin")){
+			assert("Invalid file path." && argv[i + 1]);
+			strncpy(file_path, argv[i++ + 1], 256);
+		}
+		else if(!strcmp(argv[i], "--mem_size")){
+			assert("Invalid [mem_size] value." && argv[i + 1]);
+			mem_size = atoi(argv[i++ + 1]);
+		}
+		else if(!strcmp(argv[i], "--regdump")) do_regdump = 1;
+		else{
+			printf("Invalid argument: %s\n", argv[i]);			
+			help();
+		}
 	}
 
 	trv_cpu cpu;
-	cpu.mem = malloc(4096);
+	cpu.mem = malloc(mem_size);
 
+	//file handling
+	FILE* file = fopen(file_path, "rb");
+	if(!file){
+		perror("ERROR: Can't open file");
+		exit(-1);
+	}
+
+	//load program into memory
 	fseek(file, 0, SEEK_END);
-	unsigned int file_size = ftell(file);
+	const unsigned int file_size = ftell(file);
 	rewind(file);
 	fread(cpu.mem, 1, file_size, file);
 	fclose(file);
 
+	//program execution
 	trv_init(&cpu);
-
 	while(cpu.pc < file_size + trv_MEM_OFFSET) trv_step(&cpu);
 
-	regdump(&cpu);
+	//cleanup
+	if(do_regdump) regdump(&cpu);
 	free(cpu.mem);
 }