Match and link most of Runtime

Former-commit-id: 8b0c414ae0

libc/buffer_io.h

@@ -0,0 +1,14 @@
+#ifndef _BUFFER_IO
+#define _BUFFER_IO
+
+#include <stdio.h>
+
+enum { __align_buffer, __dont_align_buffer };
+
+void __convert_from_newlines(unsigned char* p, size_t* n);
+void __convert_to_newlines(unsigned char* p, size_t* n);
+void __prep_buffer(FILE*);
+int __load_buffer(FILE*, size_t* bytes_loaded, int alignment);
+int __flush_buffer(FILE*, size_t* bytes_flushed);
+
+#endif // _BUFFER_IO