save fpu state properly-ish, add a guard to doom_malloc_wrapper, fix QueryPerformance* and GetSystemTimeAsFileTime

code/doom/doom.c

@@ -27,11 +27,12 @@ static void doom_print_wrapper(const char* msg)
 
 // ---------------------------------------------------------------------------
 // doom_malloc_fn / doom_free_fn
-// Heap handle 0, same convention as video.c.
 // ---------------------------------------------------------------------------
 static void* doom_malloc_wrapper(int size)
 {
-    return HeapAlloc(0, HEAP_ZERO_MEMORY, size);
+    void* p = HeapAlloc(0, HEAP_ZERO_MEMORY, size);
+    if (!p) ExitProcess(GetLastError());
+    return p;
 }
 
 static void doom_free_wrapper(void* ptr)
@@ -126,7 +127,7 @@ static void doom_exit_wrapper(int code)
 static char* doom_getenv_wrapper(const char* name)
 {
     if (strcmp(name, "HOME") == 0) {
-        static char home[] = "fs0:\\";
+        static char home[] = "c:";
         doom_print_wrapper("getenv: Returning HOME="); doom_print_wrapper(home); doom_print_wrapper("\n");
         return home;
     }