CopyFile() for POSIX

1 files changed, 44 insertions, 7 deletions

diff --git a/zencore/filesystem.cpp b/zencore/filesystem.cpp
index 50a82c99b..181b879db 100644
--- a/zencore/filesystem.cpp
+++ b/zencore/filesystem.cpp
@@ -418,7 +418,6 @@ CloneFile(std::filesystem::path FromPath, std::filesystem::path ToPath)
 bool
 CopyFile(std::filesystem::path FromPath, std::filesystem::path ToPath, const CopyFileOptions& Options)
 {
-#if ZEN_PLATFORM_WINDOWS
 	bool Success = false;
 
 	if (Options.EnableClone)
@@ -436,6 +435,7 @@ CopyFile(std::filesystem::path FromPath, std::filesystem::path ToPath, const Cop
 		return false;
 	}
 
+#if ZEN_PLATFORM_WINDOWS
 	BOOL CancelFlag = FALSE;
 	Success			= !!::CopyFileExW(FromPath.c_str(),
 							  ToPath.c_str(),
@@ -443,17 +443,54 @@ CopyFile(std::filesystem::path FromPath, std::filesystem::path ToPath, const Cop
 							  /* lpData */ nullptr,
 							  &CancelFlag,
 							  /* dwCopyFlags */ 0);
+#else
+	using namespace fmt::literals;
 
-	if (!Success)
+	struct ScopedFd { ~ScopedFd() { close(Fd); } int Fd; };
+
+	// From file
+	int FromFd = open(FromPath.c_str(), O_RDONLY);
+	if (FromFd < 0)
 	{
-		throw std::system_error(std::error_code(::GetLastError(), std::system_category()), "file copy failed");
+		ThrowLastError("failed to open file {}"_format(FromPath));
 	}
+	ScopedFd $From = { FromFd };
 
-	return Success;
-#else
-	ZEN_ERROR("CopyFile() is not implemented on this platform");
-	return false;
+	// To file
+	int ToFd = open(ToPath.c_str(), O_WRONLY|O_CREAT|O_EXCL);
+	if (ToFd < 0)
+	{
+		ThrowLastError("failed to create file {}"_format(ToPath));
+	}
+	ScopedFd $To = { ToFd };
+
+	// Copy impl
+	static const size_t BufferSize = 64 << 10;
+	void* Buffer = malloc(BufferSize);
+	while (true)
+	{
+		int BytesRead = read(FromFd, Buffer, BufferSize);
+		if (BytesRead <= 0)
+		{
+			Success = (BytesRead == 0);
+			break;
+		}
+
+		if (write(ToFd, Buffer, BytesRead) != BufferSize)
+		{
+			Success = false;
+			break;
+		}
+	}
+	free(Buffer);
 #endif	// ZEN_PLATFORM_WINDOWS
+
+	if (!Success)
+	{
+		ThrowLastError("file copy failed"sv);
+	}
+
+	return true;
 }
 
 void