From 8cd91f5a6a4069f5b09fd459c0959ea00839323c Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Mon, 10 Jul 2023 16:24:03 +0300
Subject: [PATCH] Userspace: add basic 'touch' command

---
 userspace/CMakeLists.txt       |  1 +
 userspace/touch/CMakeLists.txt | 16 ++++++++++++++++
 userspace/touch/main.cpp       | 21 +++++++++++++++++++++
 3 files changed, 38 insertions(+)
 create mode 100644 userspace/touch/CMakeLists.txt
 create mode 100644 userspace/touch/main.cpp

diff --git a/userspace/CMakeLists.txt b/userspace/CMakeLists.txt
index d0c3bf9e80..f71e801724 100644
--- a/userspace/CMakeLists.txt
+++ b/userspace/CMakeLists.txt
@@ -11,6 +11,7 @@ set(USERSPACE_PROJECTS
 	Shell
 	tee
 	test
+	touch
 	u8sum
 	yes
 )
diff --git a/userspace/touch/CMakeLists.txt b/userspace/touch/CMakeLists.txt
new file mode 100644
index 0000000000..34d61f6a8c
--- /dev/null
+++ b/userspace/touch/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(touch CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(touch ${SOURCES})
+target_compile_options(touch PUBLIC -O2 -g)
+target_link_libraries(touch PUBLIC libc)
+
+add_custom_target(touch-install
+	COMMAND cp ${CMAKE_CURRENT_BINARY_DIR}/touch ${BANAN_BIN}/
+	DEPENDS touch
+)
diff --git a/userspace/touch/main.cpp b/userspace/touch/main.cpp
new file mode 100644
index 0000000000..23ddd8ac93
--- /dev/null
+++ b/userspace/touch/main.cpp
@@ -0,0 +1,21 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+	for (int i = 1; i < argc; i++)
+	{
+		int fd = open(argv[i], O_WRONLY | O_CREAT, 0644);
+		if (fd == -1)
+		{
+			if (errno != EEXISTS)
+				perror(argv[i]);
+		}
+		else
+		{
+			close(fd);
+		}
+	}
+	return 0;
+}