From 43458cc74f83a47c05b8b43e038211e6ab164b16 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Thu, 7 Dec 2023 10:16:15 +0200
Subject: [PATCH] BAN: implement exchange sort and test for it

---
 BAN/include/BAN/Sort.h             | 20 ++++++++++++++++
 userspace/CMakeLists.txt           |  1 +
 userspace/test-sort/CMakeLists.txt | 16 +++++++++++++
 userspace/test-sort/main.cpp       | 37 ++++++++++++++++++++++++++++++
 4 files changed, 74 insertions(+)
 create mode 100644 BAN/include/BAN/Sort.h
 create mode 100644 userspace/test-sort/CMakeLists.txt
 create mode 100644 userspace/test-sort/main.cpp

diff --git a/BAN/include/BAN/Sort.h b/BAN/include/BAN/Sort.h
new file mode 100644
index 00000000..4f1f6ab2
--- /dev/null
+++ b/BAN/include/BAN/Sort.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <BAN/Swap.h>
+#include <BAN/Traits.h>
+
+namespace BAN
+{
+
+	template<typename It, typename Comp = less<typename It::value_type>>
+	void sort_exchange(It begin, It end, Comp comp = {})
+	{
+		for (It lhs = begin; lhs != end; ++lhs)
+			for (It rhs = lhs; ++rhs != end;)
+				if (!comp(*lhs, *rhs))
+					swap(*lhs, *rhs);
+	}
+
+
+
+}
diff --git a/userspace/CMakeLists.txt b/userspace/CMakeLists.txt
index 1c36198b..69031c7d 100644
--- a/userspace/CMakeLists.txt
+++ b/userspace/CMakeLists.txt
@@ -28,6 +28,7 @@ set(USERSPACE_PROJECTS
 	test
 	test-globals
 	test-framebuffer
+	test-sort
 	touch
 	u8sum
 	whoami
diff --git a/userspace/test-sort/CMakeLists.txt b/userspace/test-sort/CMakeLists.txt
new file mode 100644
index 00000000..1a88a60c
--- /dev/null
+++ b/userspace/test-sort/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(test-sort CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(test-sort ${SOURCES})
+target_compile_options(test-sort PUBLIC -O2 -g)
+target_link_libraries(test-sort PUBLIC libc)
+
+add_custom_target(test-sort-install
+	COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/test-sort ${BANAN_BIN}/
+	DEPENDS test-sort
+)
diff --git a/userspace/test-sort/main.cpp b/userspace/test-sort/main.cpp
new file mode 100644
index 00000000..0955f994
--- /dev/null
+++ b/userspace/test-sort/main.cpp
@@ -0,0 +1,37 @@
+#include <BAN/Vector.h>
+#include <BAN/Sort.h>
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+template<typename T>
+bool is_sorted(BAN::Vector<T>& vec)
+{
+	for (size_t i = 0; i < vec.size() - 1; i++)
+		if (vec[i] > vec[i + 1])
+			return false;
+	return true;
+}
+
+#define CURRENT_NS() ({ timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); ts.tv_sec * 1'000'000'000 + ts.tv_nsec; })
+
+#define TEST(name, function, count) do {												\
+		BAN::Vector<int> ivec(count, 0);												\
+		for (int& i : ivec)																\
+			i = rand() % 100;															\
+		uint64_t start_ns = CURRENT_NS();												\
+		function(ivec.begin(), ivec.end());												\
+		uint64_t end_ns = CURRENT_NS();													\
+		uint64_t dur_us = (end_ns - start_ns) / 1000;									\
+		printf(name " (" #count "): %s\n", is_sorted(ivec) ? "success" : "fail");		\
+		printf("  took %" PRIu64 ".%03" PRIu64 " ms\n", dur_us / 1000, dur_us % 1000);	\
+	} while (0)
+
+int main()
+{
+	srand(time(0));
+	TEST("exchange sort", BAN::sort_exchange, 100);
+	TEST("exchange sort", BAN::sort_exchange, 1000);
+	TEST("exchange sort", BAN::sort_exchange, 10000);
+}