From 23b21e63a010a55ba429e31415f8fa2e5c3117e2 Mon Sep 17 00:00:00 2001
From: nickofolas <nickofolas@gmail.com>
Date: Mon, 3 Jan 2022 17:00:32 -0600
Subject: [PATCH] Validate RAM amount in ns.purchaseServer()

---
 src/NetscriptFunctions.ts     | 2 +-
 src/Server/ServerPurchases.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/NetscriptFunctions.ts b/src/NetscriptFunctions.ts
index b52f1b83c..d9608de53 100644
--- a/src/NetscriptFunctions.ts
+++ b/src/NetscriptFunctions.ts
@@ -1639,7 +1639,7 @@ export function NetscriptFunctions(workerScript: WorkerScript): NS {
 
       const cost = getPurchaseServerCost(ram);
       if (cost === Infinity) {
-        workerScript.log("purchaseServer", () => `Invalid argument: ram='${ram}' must be power of 2`);
+        workerScript.log("purchaseServer", () => `Invalid argument: ram='${ram}' must be a positive power of 2`);
         return "";
       }
 
diff --git a/src/Server/ServerPurchases.ts b/src/Server/ServerPurchases.ts
index 1c7f6d08d..3cf62635d 100644
--- a/src/Server/ServerPurchases.ts
+++ b/src/Server/ServerPurchases.ts
@@ -20,7 +20,7 @@ import { isPowerOfTwo } from "../utils/helpers/isPowerOfTwo";
  */
 export function getPurchaseServerCost(ram: number): number {
   const sanitizedRam = Math.round(ram);
-  if (isNaN(sanitizedRam) || !isPowerOfTwo(sanitizedRam)) {
+  if (isNaN(sanitizedRam) || !isPowerOfTwo(sanitizedRam) || !(Math.sign(sanitizedRam) === 1)) {
     return Infinity;
   }