New rotating file logger that keeps on running regardless of errors (#495)

* New rotating file logger that keeps on running regardless of errors

1 files changed, 33 insertions, 1 deletions

diff --git a/src/zenutil/basicfile.cpp b/src/zenutil/basicfile.cpp
index 259d622c4..1dce71e60 100644
--- a/src/zenutil/basicfile.cpp
+++ b/src/zenutil/basicfile.cpp
@@ -365,7 +365,39 @@ BasicFile::FileSize()
 	int Fd = int(uintptr_t(m_FileHandle));
 	static_assert(sizeof(decltype(stat::st_size)) == sizeof(uint64_t), "fstat() doesn't support large files");
 	struct stat Stat;
-	fstat(Fd, &Stat);
+	if (fstat(Fd, &Stat) == -1)
+	{
+		ThrowSystemError(GetLastError(), fmt::format("Failed to get file size from file '{}'", PathFromHandle(m_FileHandle)));
+	}
+	return uint64_t(Stat.st_size);
+#endif
+}
+
+uint64_t
+BasicFile::FileSize(std::error_code& Ec)
+{
+#if ZEN_PLATFORM_WINDOWS
+	ULARGE_INTEGER liFileSize;
+	liFileSize.LowPart = ::GetFileSize(m_FileHandle, &liFileSize.HighPart);
+	if (liFileSize.LowPart == INVALID_FILE_SIZE)
+	{
+		int Error = zen::GetLastError();
+		if (Error)
+		{
+			Ec = MakeErrorCode(Error);
+			return 0;
+		}
+	}
+	return uint64_t(liFileSize.QuadPart);
+#else
+	int Fd = int(uintptr_t(m_FileHandle));
+	static_assert(sizeof(decltype(stat::st_size)) == sizeof(uint64_t), "fstat() doesn't support large files");
+	struct stat Stat;
+	if (fstat(Fd, &Stat) == -1)
+	{
+		Ec = MakeErrorCodeFromLastError();
+		return 0;
+	}
 	return uint64_t(Stat.st_size);
 #endif
 }