2 files changed, 12 insertions, 0 deletions
diff --git a/Userland/Libraries/LibC/stdio.cpp b/Userland/Libraries/LibC/stdio.cpp
index ebbccb3ab5..28486b2cb4 100644
--- a/Userland/Libraries/LibC/stdio.cpp
+++ b/Userland/Libraries/LibC/stdio.cpp
@@ -1328,6 +1328,17 @@ void __fpurge(FILE* stream)
     stream->purge();
 }
 
+size_t __freadahead(FILE* stream)
+{
+    VERIFY(stream);
+
+    ScopedFileLock lock(stream);
+
+    size_t available_size;
+    stream->readptr(available_size);
+    return available_size;
+}
+
 char const* __freadptr(FILE* stream, size_t* sizep)
 {
     VERIFY(stream);
diff --git a/Userland/Libraries/LibC/stdio_ext.h b/Userland/Libraries/LibC/stdio_ext.h
index 3dda605f6f..5484ee172f 100644
--- a/Userland/Libraries/LibC/stdio_ext.h
+++ b/Userland/Libraries/LibC/stdio_ext.h
@@ -15,6 +15,7 @@ int __freading(FILE*);
 int __fwriting(FILE*);
 void __fpurge(FILE*);
 
+size_t __freadahead(FILE*);
 char const* __freadptr(FILE*, size_t*);
 
 __END_DECLS