From 4567db2fdb279026545195748964eb9f00fcef46 Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Thu, 12 May 2016 18:19:28 -0700
Subject: [PATCH] Add std::filesystem::filesystem_error object.

Not a standards-compliant implementation, but has the same vague shape, so should be easier to port later(?).
---
 firmware/application/file.cpp | 26 ++++++++++++++++++++++++++
 firmware/application/file.hpp | 10 ++++++++++
 2 files changed, 36 insertions(+)

diff --git a/firmware/application/file.cpp b/firmware/application/file.cpp
index 7c73a7298..7a815fc57 100644
--- a/firmware/application/file.cpp
+++ b/firmware/application/file.cpp
@@ -140,6 +140,32 @@ std::string next_filename_stem_matching_pattern(const std::string& filename_stem
 namespace std {
 namespace filesystem {
 
+std::string filesystem_error::what() const {
+	switch(err) {
+	case FR_OK: 					return "";
+	case FR_DISK_ERR:				return "disk error";
+	case FR_INT_ERR:				return "insanity detected";
+	case FR_NOT_READY:				return "not ready";
+	case FR_NO_FILE:				return "no file";
+	case FR_NO_PATH:				return "no path";
+	case FR_INVALID_NAME:			return "invalid name";
+	case FR_DENIED:					return "denied";
+	case FR_EXIST:					return "exists";
+	case FR_INVALID_OBJECT:			return "invalid object";
+	case FR_WRITE_PROTECTED:		return "write protected";
+	case FR_INVALID_DRIVE:			return "invalid drive";
+	case FR_NOT_ENABLED:			return "not enabled";
+	case FR_NO_FILESYSTEM:			return "no filesystem";
+	case FR_MKFS_ABORTED:			return "mkfs aborted";
+	case FR_TIMEOUT:				return "timeout";
+	case FR_LOCKED:					return "locked";
+	case FR_NOT_ENOUGH_CORE:		return "not enough core";
+	case FR_TOO_MANY_OPEN_FILES:	return "too many open files";
+	case FR_INVALID_PARAMETER:		return "invalid parameter";
+	default:						return "unknown";
+	}
+}
+
 directory_iterator::directory_iterator(
 	const char* path,
 	const char* wild
diff --git a/firmware/application/file.hpp b/firmware/application/file.hpp
index fde40db2b..56f9525d4 100644
--- a/firmware/application/file.hpp
+++ b/firmware/application/file.hpp
@@ -76,6 +76,16 @@ std::string next_filename_stem_matching_pattern(const std::string& filename_stem
 namespace std {
 namespace filesystem {
 
+struct filesystem_error {
+	const BYTE err;
+
+	operator bool() const {
+		return err != FR_OK;
+	}
+
+	std::string what() const;
+};
+
 using path = std::string;
 using file_status = BYTE;