Added arithmetics operations, updated readme

README.md

@@ -1,6 +1,12 @@
 # stack_vm
 
-Stack based virtual machine
+Stack based virtual machine and assembly code compiler
+
+## Features
+
+- Assembly
+  - Stack operations (push & pop)
+  - Arithmetics operations
 
 ## TODO
 

command.c

@@ -3,4 +3,9 @@
 cmd_desc_t cmd_desc[] = {
     {PUSH, 1, "PUSH"},
     {POP, 0, "POP"},
+    {ADD, 0, "ADD"},
+    {SUB, 0, "SUB"},
+    {MUL, 0, "MUL"},
+    {DIV, 0, "DIV"},
+    {MOD, 0, "MOD"},
     {NONE, 0, "NONE"}}

command.h

@@ -5,6 +5,11 @@ enum command_e
 {
   PUSH,
   POP,
+  ADD,
+  SUB,
+  MUL,
+  DIV,
+  MOD,
   NONE
 };
 

run.c

@@ -25,6 +25,46 @@ int exec(command_t cmd, stack_t *stack)
   case POP:
     stack_pop(stack);
     break;
+  case ADD:
+  {
+    int b = stack_pop(stack);
+    int a = stack_pop(stack);
+
+    stack_push(stack, a + b);
+  }
+  break;
+  case SUB:
+  {
+    int b = stack_pop(stack);
+    int a = stack_pop(stack);
+
+    stack_push(stack, a - b);
+  }
+  break;
+  case MUL:
+  {
+    int b = stack_pop(stack);
+    int a = stack_pop(stack);
+
+    stack_push(stack, a * b);
+  }
+  break;
+  case DIV:
+  {
+    int b = stack_pop(stack);
+    int a = stack_pop(stack);
+
+    stack_push(stack, a / b);
+  }
+  break;
+  case MOD:
+  {
+    int b = stack_pop(stack);
+    int a = stack_pop(stack);
+
+    stack_push(stack, a % b);
+  }
+  break;
   case NONE:
     break;
   default: