From a19fe8260a4e1f4cb9d523f5b2cb41eae0a61acd Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Fri, 23 Dec 2022 20:14:59 +0100
Subject: Add File::open_error().

---
 src/file.cc | 9 +++++++++
 src/file.h  | 8 ++++++++
 2 files changed, 17 insertions(+)

(limited to 'src')

diff --git a/src/file.cc b/src/file.cc
index b79051a3..e13954bd 100644
--- a/src/file.cc
+++ b/src/file.cc
@@ -51,11 +51,18 @@ File::File(boost::filesystem::path path, std::string mode)
 	: _path(path)
 {
 #ifdef LIBDCP_WINDOWS
+	SetLastError(0);
 	std::wstring mode_wide(mode.begin(), mode.end());
 	/* c_str() here should give a UTF-16 string */
 	_file = _wfopen(fix_long_path(path).c_str(), mode_wide.c_str());
+	if (!_file) {
+		_open_error = GetLastError();
+	}
 #else
         _file = fopen(path.c_str(), mode.c_str());
+	if (!_file) {
+		_open_error = errno;
+	}
 #endif
 }
 
@@ -63,6 +70,7 @@ File::File(boost::filesystem::path path, std::string mode)
 File::File(File&& other)
 	: _path(other._path)
 	, _file(other._file)
+	, _open_error(other._open_error)
 {
 	other._file = nullptr;
 }
@@ -74,6 +82,7 @@ File::operator=(File&& other)
 	if (*this != other) {
 		close();
 		_file = other._file;
+		_open_error = other._open_error;
 		other._file = nullptr;
 	}
 	return *this;
diff --git a/src/file.h b/src/file.h
index edc431bd..22083a9e 100644
--- a/src/file.h
+++ b/src/file.h
@@ -101,9 +101,17 @@ public:
 		return _file;
 	}
 
+	/** @return Error returned by the fopen / _wfopen call;
+	 *  errno on POSIX, GetLastError() on Windows.
+	 */
+	int open_error() const {
+		return _open_error;
+	}
+
 private:
 	boost::filesystem::path _path;
 	FILE* _file = nullptr;
+	int _open_error = 0;
 };
 
 
-- 
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