unix.c (unix_stream): Rearrange struct members, remove small_buffer.

unix.c (unix_stream): Rearrange struct members, remove small_buffer.

2007-05-26  Janne Blomqvist  <jb@gcc.gnu.org>

	* io/unix.c (unix_stream): Rearrange struct members, remove
	small_buffer.
	(int_stream): New struct.
	(fd_alloc): Always use existing buffer, never reallocate.
	(fd_sfree): Remove check for buffer != small_buffer.
	(fd_close): Likewise.
	(mem_alloc_r_at): Change to use int_stream.
	(mem_alloc_w_at): Likewise.
	(mem_read): Likewise.
	(mem_write): Likewise.
	(mem_set): Likewise.
	(mem_truncate): Likewise.
	(mem_close): Likewise.
	(mem_sfree): Likewise.
	(empty_internal_buffer): Likewise.
	(open_internal): Likewise.

From-SVN: r125099