Standard I/O Packages

The Standard I/O packages described in Annex A for

• Ada.Text_IO
• Ada.Text_IO.Complex_IO
• Ada.Text_IO.Text_Streams,
• Ada.Wide_Text_IO
• Ada.Wide_Text_IO.Complex_IO,
• Ada.Wide_Text_IO.Text_Streams
• Ada.Stream_IO
• Ada.Sequential_IO
• Ada.Direct_IO

are implemented using the C library streams facility; where

• All files are opened using fopen.
• All input/output operations use fread/fwrite.

There is no internal buffering of any kind at the Ada library level. The only buffering is that provided at the system level in the implementation of the C library routines that support streams. This facilitates shared use of these streams by mixed language programs.