generate lc3os.c as part of the build, add function for loading OS

Author: rpendleton

.gitignore

@@ -1 +1,2 @@
 lc3sim
+lc3os.c

Makefile

@@ -1,2 +1,5 @@
-lc3sim: main.c lc3os.h lc3os.c vm.h vm.c
+lc3sim: main.c lc3os.c vm.h vm.c
 	gcc --std=c11 -o lc3sim *.c
+
+lc3os.c: lc3os.obj
+	xxd -i lc3os.obj > lc3os.c

lc3os.c

@@ -41,7 +41,7 @@ int main(int argc, const char * argv[]) {
     signal(SIGINT, handle_signal);
 
     vm_ctx vm = vm_create();
-    vm_load_data(vm, lc3os_obj, lc3os_obj_len);
+    vm_load_os(vm);
     vm_load_file(vm, argv[1]);
     vm_run(vm);
     vm_destroy(vm);

lc3os.h

@@ -16,6 +16,9 @@
 
 #include "vm.h"
 
+extern unsigned char lc3os_obj[];
+extern unsigned int lc3os_obj_len;
+
 // MARK: - Types
 
 #define VM_ADDR_MAX UINT16_MAX
@@ -144,6 +147,10 @@ static void vm_write(vm_ctx vm, vm_addr addr, vm_byte val) {
     vm->mem[addr] = val;
 }
 
+void vm_load_os(vm_ctx vm) {
+    vm_load_data(vm, lc3os_obj, lc3os_obj_len);
+}
+
 void vm_load_file(vm_ctx vm, const char *file) {
     int fd, ret;
     struct stat statbuf;

lc3os.obj

@@ -5,13 +5,12 @@
 
 #pragma once
 
-#include "lc3os.h"
-
 typedef struct vm_impl* vm_ctx;
 
 vm_ctx vm_create(void);
 void vm_destroy(vm_ctx vm);
 
+void vm_load_os(vm_ctx vm);
 void vm_load_file(vm_ctx vm, const char *file);
 void vm_load_data(vm_ctx vm, unsigned const char *data, size_t length);