From aa49419173e860db5a4f4d4c9cbb8182fea394e9 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Tue, 26 Nov 2019 14:32:59 +0100
Subject: [PATCH] LibCore: Make CFile::open() truncate when opening something
 "WriteOnly"

Unless we're also opening to append (and/or if the file is required to
be a new file), CFile::open(WriteOnly) will now truncate the file.
---
 Libraries/LibCore/CFile.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Libraries/LibCore/CFile.cpp b/Libraries/LibCore/CFile.cpp
index dfa5b2c073..91c0a09258 100644
--- a/Libraries/LibCore/CFile.cpp
+++ b/Libraries/LibCore/CFile.cpp
@@ -34,6 +34,9 @@ bool CFile::open(CIODevice::OpenMode mode)
         flags |= O_RDONLY;
     } else if (mode & CIODevice::WriteOnly) {
         flags |= O_WRONLY | O_CREAT;
+        bool should_truncate = !((mode & CIODevice::Append) || (mode & CIODevice::MustBeNew));
+        if (should_truncate)
+            flags |= O_TRUNC;
     }
     if (mode & CIODevice::Append)
         flags |= O_APPEND;