From dc04a129229f5840bdb5629d186f64962a1838c1 Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Sat, 18 Jan 2020 22:16:47 +0100
Subject: [PATCH] Spectre/System/File: add getErrorMessage()

---
 include/Spectre/System/File.h |  6 ++++++
 source/System/File.cpp        | 16 +++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/Spectre/System/File.h b/include/Spectre/System/File.h
index adfc611..5adb044 100644
--- a/include/Spectre/System/File.h
+++ b/include/Spectre/System/File.h
@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <string>
+#include <system_error>
 
 namespace sp {
 
@@ -54,6 +55,8 @@ public :
 	// Close the file.
 	void close();
 
+	std::string getErrorMessage() const;
+
 	// Get the current position in the file.
 	size_t pos();
 
@@ -103,6 +106,9 @@ public :
 private :
 
 	FILE *m_handle;
+
+	// Error
+	mutable std::error_condition m_error;
 };
 
 } //namespace sp
diff --git a/source/System/File.cpp b/source/System/File.cpp
index acc6870..2cc24d3 100644
--- a/source/System/File.cpp
+++ b/source/System/File.cpp
@@ -1,6 +1,7 @@
 
 #include <string.h>
 #include <stdio.h>
+#include <system_error>
 #include <Spectre/System/File.h>
 
 namespace sp {
@@ -54,6 +55,7 @@ bool File::open(const std::string& filename, Access access, unsigned int mode)
 	if (mode & CREATE && (access == Access::WRITE || access == Access::READ_WRITE)) {
 		m_handle = fopen(filename.c_str(), "a");
 		if (!m_handle) {
+			m_error.assign(errno, std::generic_category());
 			return false;
 		}
 		fclose(m_handle);
@@ -70,12 +72,18 @@ bool File::open(const std::string& filename, Access access, unsigned int mode)
 		}
 		return true;
 	}
+
+	m_error.assign(errno, std::generic_category());
 	return false;
 }
 
 bool File::isOpen() const
 {
-	return m_handle != NULL;
+	if (m_handle == NULL) {
+		m_error = std::errc::bad_file_descriptor;
+		return false;
+	}
+	return true;
 }
 
 void File::close()
@@ -84,6 +92,12 @@ void File::close()
 		fclose(m_handle);
 		m_handle = NULL;
 	}
+	m_error.clear();
+}
+
+std::string File::getErrorMessage() const
+{
+	return m_error.message();
 }
 
 size_t File::pos()