From 4b73023b4313e433ded8680d07f1116f98ff1f39 Mon Sep 17 00:00:00 2001
From: Serhiy Mytrovtsiy <mitrovtsiy@ukr.net>
Date: Mon, 30 Nov 2020 17:02:53 +0100
Subject: [PATCH] - fix app crash with old version of IntelPowerGadget (#202)

---
 Modules/CPU/readers.swift | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/Modules/CPU/readers.swift b/Modules/CPU/readers.swift
index ca46c669..958aee32 100644
--- a/Modules/CPU/readers.swift
+++ b/Modules/CPU/readers.swift
@@ -280,11 +280,26 @@ public class FrequencyReader: Reader<Double> {
             return
         }
         
-        let PG_InitializePointer = CFBundleGetFunctionPointerForName(self.bundle, "PG_Initialize" as CFString)
-        let PG_ShutdownPointer = CFBundleGetFunctionPointerForName(self.bundle, "PG_Shutdown" as CFString)
-        let PG_ReadSamplePointer = CFBundleGetFunctionPointerForName(self.bundle, "PG_ReadSample" as CFString)
-        let PGSample_GetIAFrequencyPointer = CFBundleGetFunctionPointerForName(self.bundle, "PGSample_GetIAFrequency" as CFString)
-        let PGSample_ReleasePointer = CFBundleGetFunctionPointerForName(self.bundle, "PGSample_Release" as CFString)
+        guard let PG_InitializePointer = CFBundleGetFunctionPointerForName(self.bundle, "PG_Initialize" as CFString) else {
+            os_log(.error, log: log, "failed to find PG_Initialize")
+            return
+        }
+        guard let PG_ShutdownPointer = CFBundleGetFunctionPointerForName(self.bundle, "PG_Shutdown" as CFString) else {
+            os_log(.error, log: log, "failed to find PG_Shutdown")
+            return
+        }
+        guard let PG_ReadSamplePointer = CFBundleGetFunctionPointerForName(self.bundle, "PG_ReadSample" as CFString) else {
+            os_log(.error, log: log, "failed to find PG_ReadSample")
+            return
+        }
+        guard let PGSample_GetIAFrequencyPointer = CFBundleGetFunctionPointerForName(self.bundle, "PGSample_GetIAFrequency" as CFString) else {
+            os_log(.error, log: log, "failed to find PGSample_GetIAFrequency")
+            return
+        }
+        guard let PGSample_ReleasePointer = CFBundleGetFunctionPointerForName(self.bundle, "PGSample_Release" as CFString) else {
+            os_log(.error, log: log, "failed to find PGSample_Release")
+            return
+        }
         
         let PG_Initialize = unsafeBitCast(PG_InitializePointer, to: PG_InitializePointerFunction.self)
         self.PG_Shutdown = unsafeBitCast(PG_ShutdownPointer, to: PG_ShutdownPointerFunction.self)