memory/string support cleanup and additions (#220)

* removed unused memory classes
* added align.h alignment helpers used in upcoming changes
* added char16_t StringLength
* avoid memory alloc in SetCurrentThreadName
* added command line parsing helpers to zencore/commandline.h
* removed IoBuffer direct VirtualAlloc path

1 files changed, 72 insertions, 0 deletions

diff --git a/src/zencore/commandline.cpp b/src/zencore/commandline.cpp
new file mode 100644
index 000000000..c801bf151
--- /dev/null
+++ b/src/zencore/commandline.cpp
@@ -0,0 +1,72 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zencore/commandline.h>
+#include <zencore/string.h>
+
+#if ZEN_PLATFORM_WINDOWS
+#	include <zencore/windows.h>
+ZEN_THIRD_PARTY_INCLUDES_START
+#	include <shellapi.h>  // For command line parsing
+ZEN_THIRD_PARTY_INCLUDES_END
+#endif
+
+#include <functional>
+
+namespace zen {
+
+void
+IterateCommandlineArgs(std::function<void(const std::string_view& Arg)>& ProcessArg)
+{
+#if ZEN_PLATFORM_WINDOWS
+	int			  ArgC	  = 0;
+	const LPWSTR  CmdLine = ::GetCommandLineW();
+	const LPWSTR* ArgV	  = ::CommandLineToArgvW(CmdLine, &ArgC);
+
+	if (ArgC > 1)
+	{
+		for (int i = 1; i < ArgC; ++i)
+		{
+			StringBuilder<4096> ArgString8;
+
+			WideToUtf8(ArgV[i], ArgString8);
+
+			ProcessArg(ArgString8);
+		}
+	}
+
+	::LocalFree(HLOCAL(ArgV));
+#elif ZEN_PLATFORM_LINUX || ZEN_PLATFORM_MAC
+	if (FILE* CmdLineFile = fopen("/proc/self/cmdline", "r"))
+	{
+		const char* ArgV[255] = {};
+		int			ArgC	  = 0;
+
+		char*  Arg	= nullptr;
+		size_t Size = 0;
+		while (getdelim(&Arg, &Size, 0, CmdLineFile) != -1)
+		{
+			ArgV[ArgC++] = Arg;
+			Arg			 = nullptr;	 // getdelim will allocate buffer for next Arg
+		}
+		fclose(CmdLineFile);
+
+		if (ArgC > 1)
+		{
+			for (int i = 1; i < ArgC; ++i)
+			{
+				ProcessArg(ArgV[i]);
+			}
+		}
+
+		// cleanup after getdelim
+		while (ArgC > 0)
+		{
+			free((void*)ArgV[--ArgC]);
+		}
+	}
+#else
+#	error Unknown platform
+#endif
+}
+
+}  // namespace zen