Fix getProgramPath on macOS

Author: ruberith

Utilities/FileSystem.h

@@ -13,6 +13,9 @@
 #include <unistd.h>
 #include <dirent.h>
 #endif
+#ifdef __APPLE__
+#include <mach-o/dyld.h>
+#endif
 
 #ifndef S_ISDIR
 #define S_ISDIR(mode)  (((mode) & S_IFMT) == S_IFDIR)
@@ -217,6 +220,9 @@ namespace Utilities
 			char buffer[1000];
 #ifdef WIN32	
 			GetModuleFileName(NULL, buffer, 1000);
+#elif defined(__APPLE__)
+			uint32_t bufferSize = sizeof(buffer);
+			_NSGetExecutablePath(buffer, &bufferSize);
 #else
 			char szTmp[32];
 			sprintf(szTmp, "/proc/%d/exe", getpid());