Refactor l2vm

vm/vmstring.c

@@ -1,16 +1,21 @@
+#include "error.h"
 #include "vmstring.h"
 
 #include <string.h>
 #include <stdlib.h>
 
-void vm_string_init(struct vm_string *str, const char *text) {
+int vm_string_init(struct vm_string *str, const char *text) {
     if (text && *text) {
         str->data = strdup(text);
+        if (!str->data) {
+            return -ERR_OUT_OF_MEMORY;
+        }
         str->len = strlen(text);
         str->cap = str->len + 1;
     } else {
         vm_string_empty(str);
     }
+    return 0;
 }
 
 void vm_string_empty(struct vm_string *str) {