add: end instruction

docs/documentation.md

@@ -82,6 +82,7 @@ The syntax is very close to x86 Intel Assembly. Here is a list of the operands a
 | **jna** foo      | Jumps to `foo` if `cmp` didn't return `CMP_ABOVE` | no |
 | **jmp** foo      | Jumps to `foo`                                    | no |
 | **ret**          | Returns from the callee to the caller             | no |
+| **end**          | Ends the program                                  | no |
 | **pop** a1       | Pops the first element of the stack into a1       | no |
 | **push** 69      | Pushes the value 69 to the top of the stack       | no |
 | **call** put     | Calls the `put` API                               | yes/no |

src/instructions.c

@@ -276,3 +276,7 @@ void xor () {
 
 	eax = get_value(args->arg1) ^ get_value(args->arg2);
 }
+
+void end() {
+	exit_code = 1;
+}

src/instructions.h

@@ -54,6 +54,7 @@ void push();
 void call();
 void and();
 void xor();
+void end();
 
 static const command_t command_map[] = {
     {.command = "add", .fptr = add},
@@ -75,6 +76,7 @@ static const command_t command_map[] = {
 	{.command = "call", .fptr = call},
 	{.command = "and", .fptr = and},
 	{.command = "xor", .fptr = xor},
+	{.command = "end", .fptr = end},
 
     {.command = NULL, .fptr = NULL}
 };

src/main.c

@@ -152,10 +152,7 @@ int main(int argc, char** argv) {
 		}
 
 		if (exit_code) {
-			free(args->arg1);
-			free(args->arg2);
-			free(args);
-			return 0;
+			break;
 		}
 
 		++line_number;