From 3289b6a88746c264aa4304cf4869ca345f90cc16 Mon Sep 17 00:00:00 2001
From: Ariel Don <arieldn@protonmail.com>
Date: Sun, 11 Jul 2021 15:38:55 -0500
Subject: [PATCH] LibCore: Implement File::is_link()

It was already possible to check if a path was a directory or a device.
Now, it is possible to check if a path is a link in a similar manner.
---
 Userland/Libraries/LibCore/File.cpp | 16 ++++++++++++++++
 Userland/Libraries/LibCore/File.h   |  3 +++
 2 files changed, 19 insertions(+)

diff --git a/Userland/Libraries/LibCore/File.cpp b/Userland/Libraries/LibCore/File.cpp
index 0f30a995cb..8cdb47130a 100644
--- a/Userland/Libraries/LibCore/File.cpp
+++ b/Userland/Libraries/LibCore/File.cpp
@@ -130,6 +130,22 @@ bool File::is_directory(const String& filename)
     return S_ISDIR(st.st_mode);
 }
 
+bool File::is_link() const
+{
+    struct stat stat;
+    if (fstat(fd(), &stat) < 0)
+        return false;
+    return S_ISLNK(stat.st_mode);
+}
+
+bool File::is_link(const String& filename)
+{
+    struct stat st;
+    if (lstat(filename.characters(), &st) < 0)
+        return false;
+    return S_ISLNK(st.st_mode);
+}
+
 bool File::exists(const String& filename)
 {
     struct stat st;
diff --git a/Userland/Libraries/LibCore/File.h b/Userland/Libraries/LibCore/File.h
index cb81920d1d..86738aba94 100644
--- a/Userland/Libraries/LibCore/File.h
+++ b/Userland/Libraries/LibCore/File.h
@@ -30,6 +30,9 @@ public:
     bool is_device() const;
     static bool is_device(const String& filename);
 
+    bool is_link() const;
+    static bool is_link(const String& filename);
+
     static bool exists(const String& filename);
     static bool ensure_parent_directories(const String& path);