use write and move in place for safer writing of files (#70)

* use write and move in place for safer writing of files

1 files changed, 20 insertions, 0 deletions

diff --git a/src/zenutil/basicfile.cpp b/src/zenutil/basicfile.cpp
index f553fe5a0..d837c2caf 100644
--- a/src/zenutil/basicfile.cpp
+++ b/src/zenutil/basicfile.cpp
@@ -560,6 +560,26 @@ TemporaryFile::MoveTemporaryIntoPlace(std::filesystem::path FinalFileName, std::
 
 //////////////////////////////////////////////////////////////////////////
 
+void
+TemporaryFile::SafeWriteFile(std::filesystem::path Path, MemoryView Data)
+{
+	TemporaryFile	TempFile;
+	std::error_code Ec;
+	TempFile.CreateTemporary(Path.parent_path(), Ec);
+	if (Ec)
+	{
+		throw std::system_error(Ec, fmt::format("Failed to create temp file for file at '{}'", Path));
+	}
+	TempFile.Write(Data, 0);
+	TempFile.MoveTemporaryIntoPlace(Path, Ec);
+	if (Ec)
+	{
+		throw std::system_error(Ec, fmt::format("Failed to move temp file '{}' to '{}'", TempFile.GetPath(), Path));
+	}
+}
+
+//////////////////////////////////////////////////////////////////////////
+
 LockFile::LockFile()
 {
 }