rcs problem

[Mark Callow]

The rcs distributed with 4.2 contains the following code fragment
(in src/rdiff/diff.c):

	static	char sccsid[] = "@(#)diff.c 4.1 10/9/80";

	extern	char _sobuf[];

	main(argc, argv)
		int argc;
		char **argv;
	{
		.
		.
		setbuf(stdout, _sobuf);
		.
	}

_sobuf is a buffer declared deep within the stdio library.  Needless
to say this undocumented buffer does not appear in all stdio libraries
as I discovered while porting rcs to Sun Unix 4.2BSD.
(It worked in Sun 4.1c).

Does anyone know what this setbuf is for?  I've just removed it for now.
Walter Tichy are you out there?
-- 
>From the Tardis of Mark Callow
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