apps: Add stat

apps/CMakeLists.txt

@@ -23,3 +23,4 @@ luna_app(chown.cpp chown OFF)
 luna_app(chmod.cpp chmod OFF)
 luna_app(mkdir.cpp mkdir OFF)
 luna_app(rm.cpp rm OFF)
+luna_app(stat.cpp stat OFF)

apps/stat.cpp

@@ -0,0 +1,38 @@
+#include <os/ArgumentParser.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+static const char* file_type(mode_t mode)
+{
+    switch (mode & S_IFMT)
+    {
+    case S_IFREG: return "regular file";
+    case S_IFDIR: return "directory";
+    case S_IFCHR: return "character special device";
+    default: return "unknown file type";
+    }
+}
+
+Result<int> luna_main(int argc, char** argv)
+{
+    StringView path;
+
+    os::ArgumentParser parser;
+    parser.add_description("Display file status.");
+    parser.add_positional_argument(path, "path", true);
+    parser.parse(argc, argv);
+
+    struct stat st;
+    if (stat(path.chars(), &st) < 0)
+    {
+        perror("stat");
+        return 1;
+    }
+
+    printf(" File: %s\n", path.chars());
+    printf(" Size: %zu (%s)\n", st.st_size, file_type(st.st_mode));
+    printf("Inode: %lu Links: %lu\n", st.st_ino, st.st_nlink);
+    printf(" Mode: %#o UID: %u GID: %u\n", st.st_mode & ~S_IFMT, st.st_uid, st.st_gid);
+
+    return 0;
+}