* libgfortran.h (GFC_ITOA_BUF_SIZE, GFC_XTOA_BUF_SIZE,
	GFC_OTOA_BUF_SIZE, GFC_BTOA_BUF_SIZE): Define.
	(gfc_itoa, xtoa): Add 2 extra arguments.
	* runtime/environ.c: Include stdio.h.
	(check_buffered): Use sprintf.
	* runtime/error.c: Include assert.h.
	(gfc_itoa, xtoa): Add 2 extra arguments, avoid using static
	buffers.
	(st_printf, st_sprintf): Adjust callers.
	* io/write.c (otoa, btoa): Add 2 extra arguments, avoid using
	static buffers.
	(write_int, write_decimal): Add 2 extra arguments to conv
	function pointer, adjust caller.
	(write_integer): Adjust gfc_itoa caller.

	* io/unit.c (get_array_unit_len): Return 0 rather than NULL.

	* io/read.c (read_f): Remove spurious pointer dereference.

From-SVN: r104855