I think the right thing is to not call the append() function at all
if there are no elements to output (nelem == 0). The problem itself
is in macro OUTPUT in append.c, which just think it's always called
with at least one record to print.

So, I believe this is 'correct' fix.

Jaromir

Index: fsort.c
===================================================================
RCS file: /cvsroot/basesrc/usr.bin/sort/fsort.c,v
retrieving revision 1.12
diff -u -p -r1.12 fsort.c
--- fsort.c	2001/02/05 14:25:34	1.12
+++ fsort.c	2001/02/15 19:26:41
@@ -209,7 +209,8 @@ fsort(binno, depth, top, filelist, nfile
 				: radixsort(keylist, nelem, weights, REC_D) )
 				err(2, NULL);
 			}
-			append(keylist, nelem, depth, outfp, putline, ftbl);
+			if (nelem > 0)
+			   append(keylist, nelem, depth, outfp, putline, ftbl);
 			break;					/* pop */
 		}
 		if (panic >= PANIC) {
-- 
Jaromir Dolecek <jdolecek@NetBSD.org>      http://www.ics.muni.cz/~dolecek/
@@@@  Wanna a real operating system ? Go and get NetBSD, dammit!  @@@@