From cb7d5c9d0949b8b80ac516488b8fc58032f0d8df Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Thu, 5 Dec 2024 08:30:30 +0200
Subject: [PATCH] userspace: Implement `dirname` utility

---
 userspace/programs/CMakeLists.txt         |  1 +
 userspace/programs/dirname/CMakeLists.txt |  8 ++++++++
 userspace/programs/dirname/main.cpp       | 18 ++++++++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 userspace/programs/dirname/CMakeLists.txt
 create mode 100644 userspace/programs/dirname/main.cpp

diff --git a/userspace/programs/CMakeLists.txt b/userspace/programs/CMakeLists.txt
index ec6ce9ce..93c98441 100644
--- a/userspace/programs/CMakeLists.txt
+++ b/userspace/programs/CMakeLists.txt
@@ -7,6 +7,7 @@ set(USERSPACE_PROGRAMS
 	cp
 	dd
 	dhcp-client
+	dirname
 	DynamicLoader
 	echo
 	env
diff --git a/userspace/programs/dirname/CMakeLists.txt b/userspace/programs/dirname/CMakeLists.txt
new file mode 100644
index 00000000..f8b22d47
--- /dev/null
+++ b/userspace/programs/dirname/CMakeLists.txt
@@ -0,0 +1,8 @@
+set(SOURCES
+	main.cpp
+)
+
+add_executable(dirname ${SOURCES})
+banan_link_library(dirname libc)
+
+install(TARGETS dirname OPTIONAL)
diff --git a/userspace/programs/dirname/main.cpp b/userspace/programs/dirname/main.cpp
new file mode 100644
index 00000000..1fe01ab7
--- /dev/null
+++ b/userspace/programs/dirname/main.cpp
@@ -0,0 +1,18 @@
+#include <libgen.h>
+#include <stdio.h>
+
+int usage(const char* argv0, int ret)
+{
+	FILE* fout = ret ? stderr : stdout;
+	fprintf(fout, "usage: %s STRING\n", argv0);
+	return ret;
+}
+
+int main(int argc, const char* argv[])
+{
+	if (argc != 2)
+		return usage(argv[0], 1);
+	const char* result = dirname(const_cast<char*>(argv[1]));
+	printf("%s\n", result);
+	return 0;
+}