Add util::executable_path()

libs/util/include/psemek/util/executable_path.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <filesystem>
+
+namespace psemek::util
+{
+
+	std::filesystem::path executable_path();
+
+}

libs/util/source/executable_path.cpp

@@ -0,0 +1,36 @@
+#include <psemek/util/executable_path.hpp>
+#include <psemek/util/to_string.hpp>
+
+#ifdef WIN32
+#include <libloaderapi.h>
+#include <errhandlingapi.h>
+#include <winerror.h>
+#endif
+
+namespace psemek::util
+{
+
+	std::filesystem::path executable_path()
+	{
+#if defined WIN32
+		std::string result(256, '\0');
+		while (true)
+		{
+			GetModuleFileNameA(NULL, result.data(), result.size());
+			auto error = GetLastError();
+			if (error == ERROR_SUCCESS)
+				break;
+			else if (error == ERROR_INSUFFICIENT_BUFFER)
+				result.resize(result.size() * 2);
+			else
+				throw std::runtime_error(util::to_string("failed to retrieve executable path: ", std::hex, error));
+		}
+		return std::filesystem::path(result);
+#elif defined __linux__
+		return std::filesystem::canonical("/proc/self/exe");
+#else
+		throw std::runtime_error("executable_path() is not implemented for this platform");
+#endif
+	}
+
+}