From 4aa233d66405791aef44d47c6fc97b561a472528 Mon Sep 17 00:00:00 2001
From: Gary Talent <gtalent2@gmail.com>
Date: Thu, 6 Apr 2017 04:59:53 -0500
Subject: [PATCH] Add ox_memcmp.

---
 src/ox/std/CMakeLists.txt      |  4 ++++
 src/ox/std/memops.cpp          | 16 +++++++++++++++
 src/ox/std/memops.hpp          |  2 ++
 src/ox/std/test/CMakeLists.txt | 10 ++++++++++
 src/ox/std/test/tests.cpp      | 36 ++++++++++++++++++++++++++++++++++
 5 files changed, 68 insertions(+)
 create mode 100644 src/ox/std/test/CMakeLists.txt
 create mode 100644 src/ox/std/test/tests.cpp

diff --git a/src/ox/std/CMakeLists.txt b/src/ox/std/CMakeLists.txt
index efb6250b8..c2bba8567 100644
--- a/src/ox/std/CMakeLists.txt
+++ b/src/ox/std/CMakeLists.txt
@@ -15,3 +15,7 @@ install(
 	DESTINATION
 		include/ox/std
 )
+
+if(OX_BUILD_EXEC STREQUAL "ON")
+	add_subdirectory(test)
+endif()
diff --git a/src/ox/std/memops.cpp b/src/ox/std/memops.cpp
index b58713f37..f6641e30c 100644
--- a/src/ox/std/memops.cpp
+++ b/src/ox/std/memops.cpp
@@ -7,6 +7,22 @@
  */
 #include "memops.hpp"
 
+int ox_memcmp(const void *ptr1, const void *ptr2, size_t size) {
+	int retval = 0;
+	auto block1 = ((uint8_t*) ptr1);
+	auto block2 = ((uint8_t*) ptr2);
+	for (size_t i = 0; i < size; i++) {
+		if (block1[i] < block2[i]) {
+			retval = -1;
+			break;
+		} else if (block1[i] > block2[i]) {
+			retval = 1;
+			break;
+		}
+	}
+	return retval;
+}
+
 void *ox_memcpy(void *dest, const void *src, int64_t size) {
 	char *srcBuf = (char*) src;
 	char *dstBuf = (char*) dest;
diff --git a/src/ox/std/memops.hpp b/src/ox/std/memops.hpp
index d6b1dc9e1..810f0fca5 100644
--- a/src/ox/std/memops.hpp
+++ b/src/ox/std/memops.hpp
@@ -9,6 +9,8 @@
 
 #include "types.hpp"
 
+int ox_memcmp(const void *ptr1, const void *ptr2, size_t size);
+
 void *ox_memcpy(void *src, const void *dest, int64_t size);
 
 void *ox_memset(void *ptr, int val, int64_t size);
diff --git a/src/ox/std/test/CMakeLists.txt b/src/ox/std/test/CMakeLists.txt
new file mode 100644
index 000000000..31ef13785
--- /dev/null
+++ b/src/ox/std/test/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 2.8)
+
+add_executable(
+	StdTest
+		tests.cpp
+)
+
+target_link_libraries(StdTest OxStd)
+
+add_test("Test\\ ox_memcmp" StdTest "ox_memcmp")
diff --git a/src/ox/std/test/tests.cpp b/src/ox/std/test/tests.cpp
new file mode 100644
index 000000000..131560b34
--- /dev/null
+++ b/src/ox/std/test/tests.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 - 2016 gtalent2@gmail.com
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#include <iostream>
+#include <map>
+#include <functional>
+#include <ox/std/std.hpp>
+
+::std::map<std::string, std::function<int()>> tests = {
+	{
+		"ox_memcmp",
+		[]() {
+			int success = 1;
+			const char *data1 = "ABCDEFG";
+			const char *data2 = "HIJKLMN";
+			success &= ox_memcmp(data1, data2, 7) < 0;
+			success &= ox_memcmp(data2, data1, 7) > 0;
+			success &= ox_memcmp(data1, data1, 7) == 0;
+			return !success;
+		}
+	}
+};
+
+int main(int argc, const char **args) {
+	if (argc > 1) {
+		auto testName = args[1];
+		if (tests.find(testName) != tests.end()) {
+			return tests[testName]();
+		}
+	}
+	return -1;
+}