include/SysfsRead.hpp

@@ -36,5 +36,9 @@ class SysfsReader
   SysfsStatus read_status() const;
 
  private:
+  /// @brief Helper method for trimming trailing whitespaces and
+  /// newline indicators
+  /// @param String from the m_path file
+  static void trim_in_place(std::string& string);
   std::filesystem::path m_path;  // Path to the input file.
 };

src/core/SysfsRead.cxx

@@ -5,11 +5,52 @@
 
 #include "SysfsRead.hpp"
 
+#include <algorithm>
+#include <fstream>
+
 SysfsReader::SysfsReader(const std::filesystem::path& input_path)
     : m_path(input_path)
 {
 }
+
 SysfsStatus SysfsReader::read_status() const
 {
+  std::ifstream input_file_stream(m_path);
+  if (!input_file_stream.is_open())
+  {
+    return SysfsStatus::Unreachable;
+  }
+  std::stringstream buffer;
+  buffer << input_file_stream.rdbuf();  // read entire stream into buffer
+  std::string contents = buffer.str();
+
+  trim_in_place(contents);  // clean input string
+  // compare
+  if (contents.empty())
+  {
+    return SysfsStatus::Empty;
+  }
+  if (contents == "1")
+  {
+    return SysfsStatus::Enabled;
+  }
+  if (contents == "error: temp too high")
+  {
+    return SysfsStatus::ErrorTempTooHigh;
+  }
   return SysfsStatus::UnexpectedValue;
 }
+
+void SysfsReader::trim_in_place(std::string& string)
+{
+  // left trim
+  string.erase(string.begin(),
+               std::find_if(string.begin(), string.end(), [](unsigned char ch)
+                            { return !std::isspace(ch); }));
+
+  // right trim
+  string.erase(std::find_if(string.rbegin(), string.rend(),
+                            [](unsigned char ch) { return !std::isspace(ch); })
+                   .base(),
+               string.end());
+}