From 54b15f3fd651ffb09260cee598f458c1fb29ce60 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Sat, 24 Dec 2016 16:13:42 +0100
Subject: extfs: Add label retrieval

---
 include/fs/extfs.hpp | 25 +++++++++++++++++++++++++
 src/extsh.cpp        |  8 ++++++--
 src/fs/extfs.cpp     | 10 ++++++++++
 3 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/include/fs/extfs.hpp b/include/fs/extfs.hpp
index 6430fe2..fb8f044 100644
--- a/include/fs/extfs.hpp
+++ b/include/fs/extfs.hpp
@@ -52,6 +52,31 @@ namespace fs
      */
     bool open() const;
 
+    /**
+     * @brief Get the label of the file system
+     *
+     * The ext2/3/4 file systems allow the use of a label for human readable identification of a file system. Because they are
+     * user configurable, there are no guarantees on whether or not the label is unique. Thus, a file system should never be
+     * identified solely by its label.
+     *
+     * @return A #std::string containing the file system label. The string might be empty if no label is set.
+     *
+     * @since 1.0
+     */
+    std::string label() const;
+
+    /**
+     * @brief Check if the file system has a label
+     *
+     * ext2/3/4 file systems may or may not have a label. If a label is present, it has a maximum length of 15 character in
+     * ISO-Latin-1 encoding.
+     *
+     * @return @p true, iff. the file system has a @p non-null label configured, @p false otherwise
+     *
+     * @since 1.0
+     */
+    bool has_label() const;
+
     private:
       std::fstream m_stream{};
       detail::extfs_superblock m_primarySuperblock{};
diff --git a/src/extsh.cpp b/src/extsh.cpp
index 87df7d3..07a7d47 100644
--- a/src/extsh.cpp
+++ b/src/extsh.cpp
@@ -10,10 +10,14 @@ int main(int argc, char const * argv[])
 
   if(disk.open())
     {
-    std::clog << "[EXT2] Successfully opened ext*fs at: '" << path << "'\n";
+    std::clog << "[EXTSH] Successfully opened ext*fs at: '" << path << "'\n";
+    if(disk.has_label())
+      {
+      std::clog << "[EXTSH] The filesystem is labeled '" << disk.label() << "'\n";
+      }
     }
   else
     {
-    std::clog << "[EXT2] Failed to open ext*fs at: '" << path << "'\n";
+    std::clog << "[EXTSH] Failed to open ext*fs at: '" << path << "'\n";
     }
   }
diff --git a/src/fs/extfs.cpp b/src/fs/extfs.cpp
index 55cffd8..671124d 100644
--- a/src/fs/extfs.cpp
+++ b/src/fs/extfs.cpp
@@ -32,4 +32,14 @@ namespace fs
     return m_stream && m_primarySuperblock.magic_number == kExtfsMagic;
     }
 
+  std::string extfs::label() const
+    {
+    return std::string{m_primarySuperblock.label.cbegin(), m_primarySuperblock.label.cend()};
+    }
+
+  bool extfs::has_label() const
+    {
+    return m_primarySuperblock.label[0];
+    }
+
   }
-- 
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