From 313b00b11fc6bf3896cd2f386463f46393f95626 Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Thu, 10 Aug 2023 11:15:17 +0300
Subject: [PATCH] Userspace: implement basic stat

I tried to format the output pretty much how linux does, except for
uid and git -> name resolution which is not implemented
---
 userspace/CMakeLists.txt      |  1 +
 userspace/stat/CMakeLists.txt | 16 ++++++++
 userspace/stat/main.cpp       | 75 +++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+)
 create mode 100644 userspace/stat/CMakeLists.txt
 create mode 100644 userspace/stat/main.cpp

diff --git a/userspace/CMakeLists.txt b/userspace/CMakeLists.txt
index 0e761a5f0..7acbbd810 100644
--- a/userspace/CMakeLists.txt
+++ b/userspace/CMakeLists.txt
@@ -9,6 +9,7 @@ set(USERSPACE_PROJECTS
 	init
 	ls
 	Shell
+	stat
 	tee
 	test
 	touch
diff --git a/userspace/stat/CMakeLists.txt b/userspace/stat/CMakeLists.txt
new file mode 100644
index 000000000..13e0b6019
--- /dev/null
+++ b/userspace/stat/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(stat CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(stat ${SOURCES})
+target_compile_options(stat PUBLIC -O2 -g)
+target_link_libraries(stat PUBLIC libc ban)
+
+add_custom_target(stat-install
+	COMMAND cp ${CMAKE_CURRENT_BINARY_DIR}/stat ${BANAN_BIN}/
+	DEPENDS stat
+)
diff --git a/userspace/stat/main.cpp b/userspace/stat/main.cpp
new file mode 100644
index 000000000..7d72f81e3
--- /dev/null
+++ b/userspace/stat/main.cpp
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+
+#include <BAN/Time.h>
+
+void print_timestamp(timespec ts)
+{
+	auto time = BAN::from_unix_time(ts.tv_sec);
+	printf("%04d-%02d-%02d %02d:%02d:%02d.%09d",
+		time.year, time.month, time.day,
+		time.hour, time.minute, time.second,
+		ts.tv_nsec
+	);
+}
+
+int main(int argc, char** argv)
+{
+	for (int i = 1; i < argc; i++)
+	{
+		struct stat st;
+		if (stat(argv[i], &st) == -1)
+		{
+			perror("stat");
+			continue;
+		}
+
+		char access[11];
+		const char* type = nullptr;
+		if (S_ISBLK(st.st_mode)) {
+			access[0] = 'b';
+			type = "block special file";
+		} else if (S_ISCHR(st.st_mode)) {
+			access[0] = 'c';
+			type = "character special file";
+		} else if (S_ISDIR(st.st_mode)) {
+			access[0] = 'd';
+			type = "directory";
+		} else if (S_ISFIFO(st.st_mode)) {
+			access[0] = 'f';
+			type = "fifo";
+		} else if (S_ISREG(st.st_mode)) {
+			access[0] = '-';
+			type = "regular file";
+		} else if (S_ISLNK(st.st_mode)) {
+			access[0] = 'l';
+			type = "symbolic link";
+		} else if (S_ISSOCK(st.st_mode)) {
+			access[0] = 's';
+			type = "socket";
+		} else {
+			access[0] = '-';
+			type = "unknown";
+		}
+
+		access[1] = (st.st_mode & S_IRUSR) ? 'r' : '-';
+		access[2] = (st.st_mode & S_IWUSR) ? 'w' : '-';
+		access[3] = (st.st_mode & S_IXUSR) ? 'x' : '-';
+		access[4] = (st.st_mode & S_IRGRP) ? 'r' : '-';
+		access[5] = (st.st_mode & S_IWGRP) ? 'w' : '-';
+		access[6] = (st.st_mode & S_IXGRP) ? 'x' : '-';
+		access[7] = (st.st_mode & S_IROTH) ? 'r' : '-';
+		access[8] = (st.st_mode & S_IWOTH) ? 'w' : '-';
+		access[9] = (st.st_mode & S_IXOTH) ? 'x' : '-';
+		access[10] = '\0';
+
+		printf("  File: %s\n", argv[i]);
+		printf("  Size: %-15d Blocks: %-10d IO Block: %-6d %s\n", (int)st.st_size, (int)st.st_blocks, (int)st.st_blksize, type);
+		printf("Device: %d,%-5d Inode: %-11d Links: %-5d Device type: %d,%d\n", (int)major(st.st_dev), (int)minor(st.st_dev), (int)st.st_ino, (int)st.st_nlink, (int)major(st.st_rdev), (int)minor(st.st_rdev));
+		printf("Access: (%04o/%s)  Uid: %5d Gid: %5d\n", (int)(st.st_mode & S_IRWXMASK), access, (int)st.st_uid, (int)st.st_gid);
+		printf("Access: "); print_timestamp(st.st_atim); printf("\n");
+		printf("Modify: "); print_timestamp(st.st_mtim); printf("\n");
+		printf("Change: "); print_timestamp(st.st_ctim); printf("\n");
+	}
+}