From 7b8088c78d66f4d4a551c626971276d148907820 Mon Sep 17 00:00:00 2001
From: Samuel Bowman <sam@sambowman.tech>
Date: Sun, 26 Jun 2022 19:04:06 -0400
Subject: [PATCH] LibCore: Add File::is_{block,char}_device() helpers

The existing File::is_device() helpers don't distinguish between
block and char devices. This commit adds File::is_block_device() and
File::is_char_device() helpers which are more specific.
---
 Userland/Libraries/LibCore/File.cpp | 32 +++++++++++++++++++++++++++++
 Userland/Libraries/LibCore/File.h   |  4 ++++
 2 files changed, 36 insertions(+)

diff --git a/Userland/Libraries/LibCore/File.cpp b/Userland/Libraries/LibCore/File.cpp
index 1f9596cc810..436ac612bd5 100644
--- a/Userland/Libraries/LibCore/File.cpp
+++ b/Userland/Libraries/LibCore/File.cpp
@@ -115,6 +115,38 @@ bool File::is_device(String const& filename)
     return S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode);
 }
 
+bool File::is_block_device() const
+{
+    struct stat stat;
+    if (fstat(fd(), &stat) < 0)
+        return false;
+    return S_ISBLK(stat.st_mode);
+}
+
+bool File::is_block_device(String const& filename)
+{
+    struct stat st;
+    if (stat(filename.characters(), &st) < 0)
+        return false;
+    return S_ISBLK(st.st_mode);
+}
+
+bool File::is_char_device() const
+{
+    struct stat stat;
+    if (fstat(fd(), &stat) < 0)
+        return false;
+    return S_ISCHR(stat.st_mode);
+}
+
+bool File::is_char_device(String const& filename)
+{
+    struct stat st;
+    if (stat(filename.characters(), &st) < 0)
+        return false;
+    return S_ISCHR(st.st_mode);
+}
+
 bool File::is_directory() const
 {
     struct stat stat;
diff --git a/Userland/Libraries/LibCore/File.h b/Userland/Libraries/LibCore/File.h
index b9394b53d7f..6037ff4c993 100644
--- a/Userland/Libraries/LibCore/File.h
+++ b/Userland/Libraries/LibCore/File.h
@@ -28,6 +28,10 @@ public:
 
     bool is_device() const;
     static bool is_device(String const& filename);
+    bool is_block_device() const;
+    static bool is_block_device(String const& filename);
+    bool is_char_device() const;
+    static bool is_char_device(String const& filename);
 
     bool is_link() const;
     static bool is_link(String const& filename);