From 49e531bd7cebb01088233374dda28b7be40a4343 Mon Sep 17 00:00:00 2001
From: Sam Bingner <sam@bingner.com>
Date: Thu, 24 Oct 2019 16:36:31 -1000
Subject: gssc <capability> was broken

---
 gssc.mm | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/gssc.mm b/gssc.mm
index 74ef336..e4fb37e 100644
--- a/gssc.mm
+++ b/gssc.mm
@@ -59,6 +59,7 @@
 
 static CFArrayRef (*$GSSystemCopyCapability)(CFStringRef);
 static CFArrayRef (*$GSSystemGetCapability)(CFStringRef);
+static CFTypeRef (*$MGCopyAnswer)(CFStringRef);
 
 void OnGSCapabilityChanged(
     CFNotificationCenterRef center,
@@ -79,7 +80,7 @@ int main(int argc, char *argv[]) {
     NSString *name = nil;
 
     if (argc == 2)
-        name = [objc_getClass("NSString") stringWithUTF8String:argv[0]];
+        name = [objc_getClass("NSString") stringWithUTF8String:argv[1]];
     else if (argc > 2) {
         fprintf(stderr, "usage: %s [capability]\n", argv[0]);
         exit(1);
@@ -109,8 +110,13 @@ int main(int argc, char *argv[]) {
         } else {
             capability = nil;
 
-            if (void *libMobileGestalt = dlopen("/usr/lib/libMobileGestalt.dylib", RTLD_GLOBAL | RTLD_LAZY))
-                if (CFTypeRef (*$MGCopyAnswer)(CFStringRef) = reinterpret_cast<CFTypeRef (*)(CFStringRef)>(dlsym(libMobileGestalt, "MGCopyAnswer"))) {
+            void *libMobileGestalt = dlopen("/usr/lib/libMobileGestalt.dylib", RTLD_GLOBAL | RTLD_LAZY);
+            if (libMobileGestalt && ($MGCopyAnswer = reinterpret_cast<CFTypeRef (*)(CFStringRef)>(dlsym(libMobileGestalt, "MGCopyAnswer")))) {
+                if (name) {
+                    capability = reinterpret_cast<const NSDictionary *>($MGCopyAnswer(reinterpret_cast<CFStringRef>(name)));
+                    if (capability != nil)
+                        capability = [capability autorelease];
+                } else {
                     NSMutableDictionary *answers([NSMutableDictionary dictionary]);
                     for (NSString *name in [NSArray arrayWithObjects:
                         @"1080p",
@@ -713,6 +719,7 @@ int main(int argc, char *argv[]) {
                         }
                     capability = answers;
                 }
+            }
         }
 
         if (capability != nil) {
-- 
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