svn commit: r327317 - in head/lib/libutil: . tests

Bartek Rutkowski robak at FreeBSD.org
Thu Dec 28 22:57:36 UTC 2017


Author: robak (ports committer)
Date: Thu Dec 28 22:57:34 2017
New Revision: 327317
URL: https://svnweb.freebsd.org/changeset/base/327317

Log:
  humanize_number(3): fix math edge case in rounding large numbers
  
  Fix for remainder overflow, when in rare cases adding remainder to divider
  exceeded 1 and turned the total to 1000 in final formatting, taking up
  the space for the unit character.
  
  The fix continues the division of the original number if the above case
  happens -- added the appropriate check to the for loop performing
  the division. This lowers the value shown, to make it fit into the buffer
  space provided (1.0M for 4+1 character buffer, as used by ls).
  
  Add test case for the reported bug and extend test program to support
  providing buffer length (ls -lh uses 5, tests hard-coded 4).
  
  PR:		224498
  Submitted by:	Pawel Biernacki <pawel.biernacki at gmail.com>
  Reported by:	Masachika Ishizuka <ish at amail.plala.or.jp>
  Reviewed by:	cem, kib
  Approved by:	cem, kib
  MFC after:	1 week
  Sponsored by:	Mysterious Code Ltd.
  Differential Revision:	D13578

Modified:
  head/lib/libutil/humanize_number.3
  head/lib/libutil/humanize_number.c
  head/lib/libutil/tests/humanize_number_test.c

Modified: head/lib/libutil/humanize_number.3
==============================================================================
--- head/lib/libutil/humanize_number.3	Thu Dec 28 22:56:30 2017	(r327316)
+++ head/lib/libutil/humanize_number.3	Thu Dec 28 22:57:34 2017	(r327317)
@@ -200,3 +200,9 @@ The
 .Dv HN_IEC_PREFIXES
 flag was introduced in
 .Fx 9.0 .
+.Sh CAVEATS
+For numbers greater than 999 using buffer length of 4 and less can cause
+rounding errors.
+When using
+.Dv HN_IEC_PREFIXES
+the same error occurs for buffer length of 5 or less.

Modified: head/lib/libutil/humanize_number.c
==============================================================================
--- head/lib/libutil/humanize_number.c	Thu Dec 28 22:56:30 2017	(r327316)
+++ head/lib/libutil/humanize_number.c	Thu Dec 28 22:57:34 2017	(r327317)
@@ -145,7 +145,8 @@ humanize_number(char *buf, size_t len, int64_t quotien
 		 */
 		for (i = 0;
 		    (quotient >= max || (quotient == max - 1 &&
-		    remainder >= divisordeccut)) && i < maxscale; i++) {
+		    (remainder >= divisordeccut || remainder >=
+		    divisor / 2))) && i < maxscale; i++) {
 			remainder = quotient % divisor;
 			quotient /= divisor;
 		}

Modified: head/lib/libutil/tests/humanize_number_test.c
==============================================================================
--- head/lib/libutil/tests/humanize_number_test.c	Thu Dec 28 22:56:30 2017	(r327316)
+++ head/lib/libutil/tests/humanize_number_test.c	Thu Dec 28 22:57:34 2017	(r327317)
@@ -49,333 +49,337 @@ static struct {
 	int64_t num;
 	int flags;
 	int scale;
+	size_t buflen;
 } test_args[] = {
 	/* tests 0-13 test 1000 suffixes */
-	{ 2, "0 ", (int64_t)0L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 k", (int64_t)500L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 M", (int64_t)500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 G", (int64_t)500*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 T", (int64_t)500*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 P", (int64_t)500*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 E", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 2, "1 ", (int64_t)1L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "2 k", (int64_t)1500L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "2 M", (int64_t)1500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "2 G", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "2 T", (int64_t)1500*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "2 P", (int64_t)1500*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "2 E", (int64_t)1500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
+	{ 2, "0 ", (int64_t)0L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 k", (int64_t)500L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 M", (int64_t)500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 G", (int64_t)500*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 T", (int64_t)500*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 P", (int64_t)500*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 E", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 2, "1 ", (int64_t)1L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "2 k", (int64_t)1500L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "2 M", (int64_t)1500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "2 G", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "2 T", (int64_t)1500*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "2 P", (int64_t)1500*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "2 E", (int64_t)1500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
 
 	/* tests 14-27 test 1024 suffixes */
-	{ 2, "0 ", (int64_t)0L, 0, HN_AUTOSCALE },
-	{ 3, "1 K", (int64_t)512L, 0, HN_AUTOSCALE },
-	{ 3, "1 M", (int64_t)512*1024L, 0, HN_AUTOSCALE },
-	{ 3, "1 G", (int64_t)512*1024*1024L, 0, HN_AUTOSCALE },
-	{ 3, "1 T", (int64_t)512*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 3, "1 P", (int64_t)512*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 3, "1 E", (int64_t)512*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 2, "1 ", (int64_t)1L, 0, HN_AUTOSCALE },
-	{ 3, "2 K", (int64_t)1536L, 0, HN_AUTOSCALE },
-	{ 3, "2 M", (int64_t)1536*1024L, 0, HN_AUTOSCALE },
-	{ 3, "2 G", (int64_t)1536*1024*1024L, 0, HN_AUTOSCALE },
-	{ 3, "2 T", (int64_t)1536*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 3, "2 P", (int64_t)1536*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 3, "2 E", (int64_t)1536*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
+	{ 2, "0 ", (int64_t)0L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 K", (int64_t)512L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 M", (int64_t)512*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 G", (int64_t)512*1024*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 T", (int64_t)512*1024*1024*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 P", (int64_t)512*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 E", (int64_t)512*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 2, "1 ", (int64_t)1L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "2 K", (int64_t)1536L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "2 M", (int64_t)1536*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "2 G", (int64_t)1536*1024*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "2 T", (int64_t)1536*1024*1024*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "2 P", (int64_t)1536*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "2 E", (int64_t)1536*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 4 },
 
 	/* tests 28-37 test rounding */
-	{ 3, "0 M", (int64_t)500*1000L-1, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 M", (int64_t)500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "1 M", (int64_t)1000*1000L + 500*1000L-1, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "2 M", (int64_t)1000*1000L + 500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 3, "0 K", (int64_t)512L-1, 0, HN_AUTOSCALE },
-	{ 3, "1 K", (int64_t)512L, 0, HN_AUTOSCALE },
-	{ 3, "0 M", (int64_t)512*1024L-1, 0, HN_AUTOSCALE },
-	{ 3, "1 M", (int64_t)512*1024L, 0, HN_AUTOSCALE },
-	{ 3, "1 M", (int64_t)1024*1024L + 512*1024L-1, 0, HN_AUTOSCALE },
-	{ 3, "2 M", (int64_t)1024*1024L + 512*1024L, 0, HN_AUTOSCALE },
+	{ 3, "0 M", (int64_t)500*1000L-1, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 M", (int64_t)500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "1 M", (int64_t)1000*1000L + 500*1000L-1, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "2 M", (int64_t)1000*1000L + 500*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 4 },
+	{ 3, "0 K", (int64_t)512L-1, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 K", (int64_t)512L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "0 M", (int64_t)512*1024L-1, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 M", (int64_t)512*1024L, 0, HN_AUTOSCALE, 4 },
+	{ 3, "1 M", (int64_t)1024*1024L + 512*1024L-1, 0, HN_AUTOSCALE, 4 },
+	{ 3, "2 M", (int64_t)1024*1024L + 512*1024L, 0, HN_AUTOSCALE, 4 },
 
 	/* tests 38-61 test specific scale factors with 1000 divisor */
-	{ 3, "0 k", (int64_t)0L, HN_DIVISOR_1000, 1 },
-	{ 3, "1 k", (int64_t)500L, HN_DIVISOR_1000, 1 },
-	{ 3, "0 M", (int64_t)500L, HN_DIVISOR_1000, 2 },
-	{ 3, "1 M", (int64_t)500*1000L, HN_DIVISOR_1000, 2 },
-	{ 3, "0 G", (int64_t)500*1000L, HN_DIVISOR_1000, 3 },
-	{ 3, "1 G", (int64_t)500*1000*1000L, HN_DIVISOR_1000, 3 },
-	{ 3, "0 T", (int64_t)500*1000*1000L, HN_DIVISOR_1000, 4 },
-	{ 3, "1 T", (int64_t)500*1000*1000*1000L, HN_DIVISOR_1000, 4 },
-	{ 3, "0 P", (int64_t)500*1000*1000*1000L, HN_DIVISOR_1000, 5 },
-	{ 3, "1 P", (int64_t)500*1000*1000*1000*1000L, HN_DIVISOR_1000, 5 },
-	{ 3, "0 E", (int64_t)500*1000*1000*1000*1000L, HN_DIVISOR_1000, 6 },
-	{ 3, "1 E", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6 },
-	{ 3, "0 k", (int64_t)1L, HN_DIVISOR_1000, 1 },
-	{ 3, "2 k", (int64_t)1500L, HN_DIVISOR_1000, 1 },
-	{ 3, "0 M", (int64_t)1500L, HN_DIVISOR_1000, 2 },
-	{ 3, "2 M", (int64_t)1500*1000L, HN_DIVISOR_1000, 2 },
-	{ 3, "0 G", (int64_t)1500*1000L, HN_DIVISOR_1000, 3 },
-	{ 3, "2 G", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, 3 },
-	{ 3, "0 T", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, 4 },
-	{ 3, "2 T", (int64_t)1500*1000*1000*1000L, HN_DIVISOR_1000, 4 },
-	{ 3, "0 P", (int64_t)1500*1000*1000*1000L, HN_DIVISOR_1000, 5 },
-	{ 3, "2 P", (int64_t)1500*1000*1000*1000*1000L, HN_DIVISOR_1000, 5 },
-	{ 3, "0 E", (int64_t)1500*1000*1000*1000*1000L, HN_DIVISOR_1000, 6 },
-	{ 3, "2 E", (int64_t)1500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6 },
+	{ 3, "0 k", (int64_t)0L, HN_DIVISOR_1000, 1, 4 },
+	{ 3, "1 k", (int64_t)500L, HN_DIVISOR_1000, 1, 4 },
+	{ 3, "0 M", (int64_t)500L, HN_DIVISOR_1000, 2, 4 },
+	{ 3, "1 M", (int64_t)500*1000L, HN_DIVISOR_1000, 2, 4 },
+	{ 3, "0 G", (int64_t)500*1000L, HN_DIVISOR_1000, 3, 4 },
+	{ 3, "1 G", (int64_t)500*1000*1000L, HN_DIVISOR_1000, 3, 4 },
+	{ 3, "0 T", (int64_t)500*1000*1000L, HN_DIVISOR_1000, 4, 4 },
+	{ 3, "1 T", (int64_t)500*1000*1000*1000L, HN_DIVISOR_1000, 4, 4 },
+	{ 3, "0 P", (int64_t)500*1000*1000*1000L, HN_DIVISOR_1000, 5, 4 },
+	{ 3, "1 P", (int64_t)500*1000*1000*1000*1000L, HN_DIVISOR_1000, 5, 4 },
+	{ 3, "0 E", (int64_t)500*1000*1000*1000*1000L, HN_DIVISOR_1000, 6, 4 },
+	{ 3, "1 E", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6, 4 },
+	{ 3, "0 k", (int64_t)1L, HN_DIVISOR_1000, 1, 4 },
+	{ 3, "2 k", (int64_t)1500L, HN_DIVISOR_1000, 1, 4 },
+	{ 3, "0 M", (int64_t)1500L, HN_DIVISOR_1000, 2, 4 },
+	{ 3, "2 M", (int64_t)1500*1000L, HN_DIVISOR_1000, 2, 4 },
+	{ 3, "0 G", (int64_t)1500*1000L, HN_DIVISOR_1000, 3, 4 },
+	{ 3, "2 G", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, 3, 4 },
+	{ 3, "0 T", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, 4, 4 },
+	{ 3, "2 T", (int64_t)1500*1000*1000*1000L, HN_DIVISOR_1000, 4, 4 },
+	{ 3, "0 P", (int64_t)1500*1000*1000*1000L, HN_DIVISOR_1000, 5, 4 },
+	{ 3, "2 P", (int64_t)1500*1000*1000*1000*1000L, HN_DIVISOR_1000, 5, 4 },
+	{ 3, "0 E", (int64_t)1500*1000*1000*1000*1000L, HN_DIVISOR_1000, 6, 4 },
+	{ 3, "2 E", (int64_t)1500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6, 4 },
 
 	/* tests 62-85 test specific scale factors with 1024 divisor */
-	{ 3, "0 K", (int64_t)0L, 0, 1 },
-	{ 3, "1 K", (int64_t)512L, 0, 1 },
-	{ 3, "0 M", (int64_t)512L, 0, 2 },
-	{ 3, "1 M", (int64_t)512*1024L, 0, 2 },
-	{ 3, "0 G", (int64_t)512*1024L, 0, 3 },
-	{ 3, "1 G", (int64_t)512*1024*1024L, 0, 3 },
-	{ 3, "0 T", (int64_t)512*1024*1024L, 0, 4 },
-	{ 3, "1 T", (int64_t)512*1024*1024*1024L, 0, 4 },
-	{ 3, "0 P", (int64_t)512*1024*1024*1024L, 0, 5 },
-	{ 3, "1 P", (int64_t)512*1024*1024*1024*1024L, 0, 5 },
-	{ 3, "0 E", (int64_t)512*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "1 E", (int64_t)512*1024*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "0 K", (int64_t)1L, 0, 1 },
-	{ 3, "2 K", (int64_t)1536L, 0, 1 },
-	{ 3, "0 M", (int64_t)1536L, 0, 2 },
-	{ 3, "2 M", (int64_t)1536*1024L, 0, 2 },
-	{ 3, "0 G", (int64_t)1536*1024L, 0, 3 },
-	{ 3, "2 G", (int64_t)1536*1024*1024L, 0, 3 },
-	{ 3, "0 T", (int64_t)1536*1024*1024L, 0, 4 },
-	{ 3, "2 T", (int64_t)1536*1024*1024*1024L, 0, 4 },
-	{ 3, "0 P", (int64_t)1536*1024*1024*1024L, 0, 5 },
-	{ 3, "2 P", (int64_t)1536*1024*1024*1024*1024L, 0, 5 },
-	{ 3, "0 E", (int64_t)1536*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "2 E", (int64_t)1536*1024*1024*1024*1024*1024L, 0, 6 },
+	{ 3, "0 K", (int64_t)0L, 0, 1, 4 },
+	{ 3, "1 K", (int64_t)512L, 0, 1, 4 },
+	{ 3, "0 M", (int64_t)512L, 0, 2, 4 },
+	{ 3, "1 M", (int64_t)512*1024L, 0, 2, 4 },
+	{ 3, "0 G", (int64_t)512*1024L, 0, 3, 4 },
+	{ 3, "1 G", (int64_t)512*1024*1024L, 0, 3, 4 },
+	{ 3, "0 T", (int64_t)512*1024*1024L, 0, 4, 4 },
+	{ 3, "1 T", (int64_t)512*1024*1024*1024L, 0, 4, 4 },
+	{ 3, "0 P", (int64_t)512*1024*1024*1024L, 0, 5, 4 },
+	{ 3, "1 P", (int64_t)512*1024*1024*1024*1024L, 0, 5, 4 },
+	{ 3, "0 E", (int64_t)512*1024*1024*1024*1024L, 0, 6, 4 },
+	{ 3, "1 E", (int64_t)512*1024*1024*1024*1024*1024L, 0, 6, 4 },
+	{ 3, "0 K", (int64_t)1L, 0, 1, 4 },
+	{ 3, "2 K", (int64_t)1536L, 0, 1, 4 },
+	{ 3, "0 M", (int64_t)1536L, 0, 2, 4 },
+	{ 3, "2 M", (int64_t)1536*1024L, 0, 2, 4 },
+	{ 3, "0 G", (int64_t)1536*1024L, 0, 3, 4 },
+	{ 3, "2 G", (int64_t)1536*1024*1024L, 0, 3, 4 },
+	{ 3, "0 T", (int64_t)1536*1024*1024L, 0, 4, 4 },
+	{ 3, "2 T", (int64_t)1536*1024*1024*1024L, 0, 4, 4 },
+	{ 3, "0 P", (int64_t)1536*1024*1024*1024L, 0, 5, 4 },
+	{ 3, "2 P", (int64_t)1536*1024*1024*1024*1024L, 0, 5, 4 },
+	{ 3, "0 E", (int64_t)1536*1024*1024*1024*1024L, 0, 6, 4 },
+	{ 3, "2 E", (int64_t)1536*1024*1024*1024*1024*1024L, 0, 6, 4 },
 
 	/* tests 86-99 test invalid specific scale values of < 0 or >= 7 with
 	and without HN_DIVISOR_1000 set */
 	/*  all should return errors with new code; with old, the latter 3
 	are instead processed as if having AUTOSCALE and/or GETSCALE set */
-	{ -1, "", (int64_t)1L, 0, 7 },
-	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, 7 },
-	{ -1, "", (int64_t)1L, 0, 1000 },
-	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, 1000 },
-	{ -1, "", (int64_t)0L, 0, 1000*1000 },
-	{ -1, "", (int64_t)0L, HN_DIVISOR_1000, 1000*1000 },
-	{ -1, "", (int64_t)0L, 0, INT_MAX },
-	{ -1, "", (int64_t)0L, HN_DIVISOR_1000, INT_MAX },
+	{ -1, "", (int64_t)1L, 0, 7, 4 },
+	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, 7, 4 },
+	{ -1, "", (int64_t)1L, 0, 1000, 4 },
+	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, 1000, 4 },
+	{ -1, "", (int64_t)0L, 0, 1000*1000, 4 },
+	{ -1, "", (int64_t)0L, HN_DIVISOR_1000, 1000*1000, 4 },
+	{ -1, "", (int64_t)0L, 0, INT_MAX, 4 },
+	{ -1, "", (int64_t)0L, HN_DIVISOR_1000, INT_MAX, 4 },
 
 	/* Negative scale values are not handled well
 	 by the existing library routine - should report as error */
 	/*  all should return errors with new code, fail assertion with old */
 
-	{ -1, "", (int64_t)1L, 0, -1 },
-	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, -1 },
-	{ -1, "", (int64_t)1L, 0, -1000 },
-	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, -1000 },
+	{ -1, "", (int64_t)1L, 0, -1, 4 },
+	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, -1, 4 },
+	{ -1, "", (int64_t)1L, 0, -1000, 4 },
+	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, -1000, 4 },
 
 	/* __INT_MIN doesn't print properly, skipped. */
 
-	{ -1, "", (int64_t)1L, 0, -__INT_MAX },
-	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, -__INT_MAX },
+	{ -1, "", (int64_t)1L, 0, -__INT_MAX, 4 },
+	{ -1, "", (int64_t)1L, HN_DIVISOR_1000, -__INT_MAX, 4 },
 
 
 	/* tests for scale == 0, without autoscale */
 	/* tests 100-114 test scale 0 with 1000 divisor - print first N digits */
-	{ 2, "0 ", (int64_t)0L, HN_DIVISOR_1000, 0 },
-	{ 2, "1 ", (int64_t)1L, HN_DIVISOR_1000, 0 },
-	{ 3, "10 ", (int64_t)10L, HN_DIVISOR_1000, 0 },
-	{ 3, "0 M", (int64_t)150L, HN_DIVISOR_1000, HN_NOSPACE },
-	{ 3, "0 M", (int64_t)500L, HN_DIVISOR_1000, HN_NOSPACE },
-	{ 3, "0 M", (int64_t)999L, HN_DIVISOR_1000, HN_NOSPACE },
-	{ 4, "150", (int64_t)150L, HN_DIVISOR_1000, 0 },
-	{ 4, "500", (int64_t)500L, HN_DIVISOR_1000, 0 },
-	{ 4, "999", (int64_t)999L, HN_DIVISOR_1000, 0 },
-	{ 5, "100", (int64_t)1000L, HN_DIVISOR_1000, 0 },
-	{ 5, "150", (int64_t)1500L, HN_DIVISOR_1000, 0 },
-	{ 7, "500", (int64_t)500*1000L, HN_DIVISOR_1000, 0 },
-	{ 8, "150", (int64_t)1500*1000L, HN_DIVISOR_1000, 0 },
-	{ 10, "500", (int64_t)500*1000*1000L, HN_DIVISOR_1000, 0 },
-	{ 11, "150", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, 0 },
+	{ 2, "0 ", (int64_t)0L, HN_DIVISOR_1000, 0, 4 },
+	{ 2, "1 ", (int64_t)1L, HN_DIVISOR_1000, 0, 4 },
+	{ 3, "10 ", (int64_t)10L, HN_DIVISOR_1000, 0, 4 },
+	{ 3, "0 M", (int64_t)150L, HN_DIVISOR_1000, HN_NOSPACE, 4 },
+	{ 3, "0 M", (int64_t)500L, HN_DIVISOR_1000, HN_NOSPACE, 4 },
+	{ 3, "0 M", (int64_t)999L, HN_DIVISOR_1000, HN_NOSPACE, 4 },
+	{ 4, "150", (int64_t)150L, HN_DIVISOR_1000, 0, 4 },
+	{ 4, "500", (int64_t)500L, HN_DIVISOR_1000, 0, 4 },
+	{ 4, "999", (int64_t)999L, HN_DIVISOR_1000, 0, 4 },
+	{ 5, "100", (int64_t)1000L, HN_DIVISOR_1000, 0, 4 },
+	{ 5, "150", (int64_t)1500L, HN_DIVISOR_1000, 0, 4 },
+	{ 7, "500", (int64_t)500*1000L, HN_DIVISOR_1000, 0, 4 },
+	{ 8, "150", (int64_t)1500*1000L, HN_DIVISOR_1000, 0, 4 },
+	{ 10, "500", (int64_t)500*1000*1000L, HN_DIVISOR_1000, 0, 4 },
+	{ 11, "150", (int64_t)1500*1000*1000L, HN_DIVISOR_1000, 0, 4 },
 
 	/* tests 115-126 test scale 0 with 1024 divisor - print first N digits */
-	{ 2, "0 ", (int64_t)0L, 0, 0 },
-	{ 2, "1 ", (int64_t)1L, 0, 0 },
-	{ 3, "10 ", (int64_t)10L, 0, 0 },
-	{ 4, "150", (int64_t)150L, 0, 0 },
-	{ 4, "500", (int64_t)500L, 0, 0 },
-	{ 4, "999", (int64_t)999L, 0, 0 },
-	{ 5, "100", (int64_t)1000L, 0, 0 },
-	{ 5, "150", (int64_t)1500L, 0, 0 },
-	{ 7, "500", (int64_t)500*1000L, 0, 0 },
-	{ 8, "150", (int64_t)1500*1000L, 0, 0 },
-	{ 10, "500", (int64_t)500*1000*1000L, 0, 0 },
-	{ 11, "150", (int64_t)1500*1000*1000L, 0, 0 },
+	{ 2, "0 ", (int64_t)0L, 0, 0, 4 },
+	{ 2, "1 ", (int64_t)1L, 0, 0, 4 },
+	{ 3, "10 ", (int64_t)10L, 0, 0, 4 },
+	{ 4, "150", (int64_t)150L, 0, 0, 4 },
+	{ 4, "500", (int64_t)500L, 0, 0, 4 },
+	{ 4, "999", (int64_t)999L, 0, 0, 4 },
+	{ 5, "100", (int64_t)1000L, 0, 0, 4 },
+	{ 5, "150", (int64_t)1500L, 0, 0, 4 },
+	{ 7, "500", (int64_t)500*1000L, 0, 0, 4 },
+	{ 8, "150", (int64_t)1500*1000L, 0, 0, 4 },
+	{ 10, "500", (int64_t)500*1000*1000L, 0, 0, 4 },
+	{ 11, "150", (int64_t)1500*1000*1000L, 0, 0, 4 },
 
+	/* Test case for rounding of edge numbers around 999.5+, see PR224498.
+	 * Require buflen >= 5 */
+	{ 4, "1.0M", (int64_t)1023500, HN_DECIMAL|HN_B|HN_NOSPACE, HN_AUTOSCALE, 5 },
+
 	/* Test boundary cases for very large positive/negative number formatting */
 	/* Explicit scale, divisor 1024 */
 
-	/* XXX = requires length 5 (buflen 6) for some cases*/
-	/* KLUDGE - test loop below will bump length 5 up to 5 */
-	{ 3, "8 E",   INT64_MAX, 0, 6 },
-	{ 4, "-8 E", -INT64_MAX, 0, 6 },
-	{ 3, "0 E", (int64_t)92*1024*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "0 E", -(int64_t)92*1024*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "0 E", (int64_t)82*1024*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "0 E", -(int64_t)82*1024*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "0 E", (int64_t)81*1024*1024*1024*1024*1024L, 0, 6 },
-	{ 3, "0 E", -(int64_t)81*1024*1024*1024*1024*1024L, 0, 6 },
-	{ 4, "92 P", (int64_t)92*1024*1024*1024*1024*1024L, 0, 5 },
-	{ 5, "-92 P", -(int64_t)92*1024*1024*1024*1024*1024L, 0, 5 },
-	{ 4, "82 P", (int64_t)82*1024*1024*1024*1024*1024L, 0, 5 },
-	{ 5, "-82 P", -(int64_t)82*1024*1024*1024*1024*1024L, 0, 5 },
-	{ 4, "81 P", (int64_t)81*1024*1024*1024*1024*1024L, 0, 5 },
-	{ 5, "-81 P", -(int64_t)81*1024*1024*1024*1024*1024L, 0, 5 },
+	/* Requires buflen >= 6 */
+	{ 3, "8 E",   INT64_MAX, 0, 6, 6 },
+	{ 4, "-8 E", -INT64_MAX, 0, 6, 6 },
+	{ 3, "0 E", (int64_t)92*1024*1024*1024*1024*1024L, 0, 6, 6 },
+	{ 3, "0 E", -(int64_t)92*1024*1024*1024*1024*1024L, 0, 6, 6 },
+	{ 3, "0 E", (int64_t)82*1024*1024*1024*1024*1024L, 0, 6, 6 },
+	{ 3, "0 E", -(int64_t)82*1024*1024*1024*1024*1024L, 0, 6, 6 },
+	{ 3, "0 E", (int64_t)81*1024*1024*1024*1024*1024L, 0, 6, 6 },
+	{ 3, "0 E", -(int64_t)81*1024*1024*1024*1024*1024L, 0, 6, 6 },
+	{ 4, "92 P", (int64_t)92*1024*1024*1024*1024*1024L, 0, 5, 6 },
+	{ 5, "-92 P", -(int64_t)92*1024*1024*1024*1024*1024L, 0, 5, 6 },
+	{ 4, "82 P", (int64_t)82*1024*1024*1024*1024*1024L, 0, 5, 6 },
+	{ 5, "-82 P", -(int64_t)82*1024*1024*1024*1024*1024L, 0, 5, 6 },
+	{ 4, "81 P", (int64_t)81*1024*1024*1024*1024*1024L, 0, 5, 6 },
+	{ 5, "-81 P", -(int64_t)81*1024*1024*1024*1024*1024L, 0, 5, 6 },
 
 	/* Explicit scale, divisor 1000 */
-	{ 3, "9 E",   INT64_MAX, HN_DIVISOR_1000, 6 },
-	{ 4, "-9 E", -INT64_MAX, HN_DIVISOR_1000,  6 },
-	{ 3, "0 E", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6 },
-	{ 3, "0 E", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6 },
-	{ 3, "0 E", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6 },
-	{ 3, "0 E", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6 },
-	{ 4, "92 P", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5 },
-	{ 5, "-92 P", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5 },
-	{ 4, "91 P", (int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5 },
-	{ 5, "-91 P", -(int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5 },
+	{ 3, "9 E",   INT64_MAX, HN_DIVISOR_1000, 6, 6 },
+	{ 4, "-9 E", -INT64_MAX, HN_DIVISOR_1000,  6, 6 },
+	{ 3, "0 E", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6, 6 },
+	{ 3, "0 E", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6, 6 },
+	{ 3, "0 E", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6, 6 },
+	{ 3, "0 E", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  6, 6 },
+	{ 4, "92 P", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5, 6 },
+	{ 5, "-92 P", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5, 6 },
+	{ 4, "91 P", (int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5, 6 },
+	{ 5, "-91 P", -(int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  5, 6 },
 
 	/* Autoscale, divisor 1024 */
-	{ 3, "8 E",   INT64_MAX, 0, HN_AUTOSCALE },
-	{ 4, "-8 E", -INT64_MAX, 0, HN_AUTOSCALE },
-	{ 4, "92 P", (int64_t)92*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 5, "-92 P", -(int64_t)92*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 4, "82 P", (int64_t)82*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 5, "-82 P", -(int64_t)82*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 4, "81 P", (int64_t)81*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
-	{ 5, "-81 P", -(int64_t)81*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE },
+	{ 3, "8 E",   INT64_MAX, 0, HN_AUTOSCALE, 6 },
+	{ 4, "-8 E", -INT64_MAX, 0, HN_AUTOSCALE, 6 },
+	{ 4, "92 P", (int64_t)92*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 6 },
+	{ 5, "-92 P", -(int64_t)92*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 6 },
+	{ 4, "82 P", (int64_t)82*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 6 },
+	{ 5, "-82 P", -(int64_t)82*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 6 },
+	{ 4, "81 P", (int64_t)81*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 6 },
+	{ 5, "-81 P", -(int64_t)81*1024*1024*1024*1024*1024L, 0, HN_AUTOSCALE, 6 },
 	/* Autoscale, divisor 1000 */
-	{ 3, "9 E",   INT64_MAX, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 4, "-9 E", -INT64_MAX, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 4, "92 P", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "-92 P", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 4, "91 P", (int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "-91 P", -(int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE },
+	{ 3, "9 E",   INT64_MAX, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 4, "-9 E", -INT64_MAX, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 4, "92 P", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "-92 P", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 4, "91 P", (int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "-91 P", -(int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
 
 	/* 0 scale, divisor 1024 */
-	{ 12, "skdj",  INT64_MAX, 0, 0 },
-	{ 21, "-9223", -INT64_MAX, 0, 0 },
-	{ 19, "10358", (int64_t)92*1024*1024*1024*1024*1024L, 0, 0 },
-	{ 20, "-1035", -(int64_t)92*1024*1024*1024*1024*1024L, 0, 0 },
-	{ 18, "92323", (int64_t)82*1024*1024*1024*1024*1024L, 0, 0 },
-	{ 19, "-9232", -(int64_t)82*1024*1024*1024*1024*1024L, 0, 0 },
-	{ 18, "91197", (int64_t)81*1024*1024*1024*1024*1024L, 0, 0 },
-	{ 19, "-9119", -(int64_t)81*1024*1024*1024*1024*1024L, 0, 0 },
+	{ 12, "skdj",  INT64_MAX, 0, 0, 6 },
+	{ 21, "-9223", -INT64_MAX, 0, 0, 6 },
+	{ 19, "10358", (int64_t)92*1024*1024*1024*1024*1024L, 0, 0, 6 },
+	{ 20, "-1035", -(int64_t)92*1024*1024*1024*1024*1024L, 0, 0, 6 },
+	{ 18, "92323", (int64_t)82*1024*1024*1024*1024*1024L, 0, 0, 6 },
+	{ 19, "-9232", -(int64_t)82*1024*1024*1024*1024*1024L, 0, 0, 6 },
+	{ 18, "91197", (int64_t)81*1024*1024*1024*1024*1024L, 0, 0, 6 },
+	{ 19, "-9119", -(int64_t)81*1024*1024*1024*1024*1024L, 0, 0, 6 },
 
 	/* 0 scale, divisor 1000 */
 	/* XXX - why does this fail? */
-	{ -1, "", INT64_MAX, HN_DIVISOR_1000, 0 },
-	{ 21, "-9223", -INT64_MAX, HN_DIVISOR_1000,  0 },
-	{ 19, "10358", (int64_t)92*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0 },
-	{ 20, "-1035", -(int64_t)92*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0 },
-	{ 18, "92323", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0 },
-	{ 19, "-9232", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0 },
+	{ -1, "", INT64_MAX, HN_DIVISOR_1000, 0, 6 },
+	{ 21, "-9223", -INT64_MAX, HN_DIVISOR_1000,  0, 6 },
+	{ 19, "10358", (int64_t)92*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0, 6 },
+	{ 20, "-1035", -(int64_t)92*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0, 6 },
+	{ 18, "92323", (int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0, 6 },
+	{ 19, "-9232", -(int64_t)82*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0, 6 },
 	/* Expected to pass */
-	{ 18, "91197", (int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0 },
-	{ 19, "-9119", -(int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0 },
+	{ 18, "91197", (int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0, 6 },
+	{ 19, "-9119", -(int64_t)81*1024*1024*1024*1024*1024L, HN_DIVISOR_1000,  0, 6 },
 
 
 
 	/* Need to implement tests for GETSCALE */
-/*	{ ?, "", (int64_t)0L, HN_DIVISOR_1000, HN_GETSCALE },
+/*	{ ?, "", (int64_t)0L, HN_DIVISOR_1000, HN_GETSCALE, 6 },
 	...
 */
         /* Tests for HN_DECIMAL */
         /* Positive, Autoscale */
-	{ 5, "500 k", (int64_t)500*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "994 k", (int64_t)994*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "995 k", (int64_t)995*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "999 k", (int64_t)999*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "1.0 M", (int64_t)1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "1.5 M", (int64_t)1500*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "1.9 M", (int64_t)1949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "2.0 M", (int64_t)1950*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "9.9 M", (int64_t)9949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 4, "10 M", (int64_t)9950*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "500 M", (int64_t)500*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "994 M", (int64_t)994*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "995 M", (int64_t)995*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "999 M", (int64_t)999*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
+	{ 5, "500 k", (int64_t)500*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "994 k", (int64_t)994*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "995 k", (int64_t)995*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "999 k", (int64_t)999*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "1.0 M", (int64_t)1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "1.5 M", (int64_t)1500*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "1.9 M", (int64_t)1949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "2.0 M", (int64_t)1950*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "9.9 M", (int64_t)9949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 4, "10 M", (int64_t)9950*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "500 M", (int64_t)500*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "994 M", (int64_t)994*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "995 M", (int64_t)995*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "999 M", (int64_t)999*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
 
-	{ 5, "500 K", (int64_t)500*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "994 K", (int64_t)994*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "995 K", (int64_t)995*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "999 K", (int64_t)999*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "1.0 M", (int64_t)1000*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "1.0 M", (int64_t)1018*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "1.0 M", (int64_t)1019*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "1.5 M", (int64_t)1536*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "1.9 M", (int64_t)1996*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "2.0 M", (int64_t)1997*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "2.0 M", (int64_t)2047*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "2.0 M", (int64_t)2048*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "2.0 M", (int64_t)2099*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "2.1 M", (int64_t)2100*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "9.9 M", (int64_t)10188*1024L, HN_DECIMAL, HN_AUTOSCALE },
+	{ 5, "500 K", (int64_t)500*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "994 K", (int64_t)994*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "995 K", (int64_t)995*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "999 K", (int64_t)999*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "1.0 M", (int64_t)1000*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "1.0 M", (int64_t)1018*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "1.0 M", (int64_t)1019*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "1.5 M", (int64_t)1536*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "1.9 M", (int64_t)1996*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "2.0 M", (int64_t)1997*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "2.0 M", (int64_t)2047*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "2.0 M", (int64_t)2048*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "2.0 M", (int64_t)2099*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "2.1 M", (int64_t)2100*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "9.9 M", (int64_t)10188*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
 	/* XXX - shouldn't the following two be "10. M"? */
-	{ 4, "10 M", (int64_t)10189*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 4, "10 M", (int64_t)10240*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "500 M", (int64_t)500*1024*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "994 M", (int64_t)994*1024*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "995 M", (int64_t)995*1024*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "999 M", (int64_t)999*1024*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "1.0 G", (int64_t)1000*1024*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "1.0 G", (int64_t)1023*1024*1024L, HN_DECIMAL, HN_AUTOSCALE },
+	{ 4, "10 M", (int64_t)10189*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 4, "10 M", (int64_t)10240*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "500 M", (int64_t)500*1024*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "994 M", (int64_t)994*1024*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "995 M", (int64_t)995*1024*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "999 M", (int64_t)999*1024*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "1.0 G", (int64_t)1000*1024*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "1.0 G", (int64_t)1023*1024*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
 
         /* Negative, Autoscale - should pass */
-	{ 6, "-1.5 ", -(int64_t)1500*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 6, "-1.9 ", -(int64_t)1949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 6, "-9.9 ", -(int64_t)9949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
+	{ 6, "-1.5 ", -(int64_t)1500*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 6, "-1.9 ", -(int64_t)1949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 6, "-9.9 ", -(int64_t)9949*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
 
-	{ 6, "-1.5 ", -(int64_t)1536*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 6, "-1.9 ", -(int64_t)1949*1024L, HN_DECIMAL, HN_AUTOSCALE },
-	{ 6, "-9.7 ", -(int64_t)9949*1024L, HN_DECIMAL, HN_AUTOSCALE },
+	{ 6, "-1.5 ", -(int64_t)1536*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 6, "-1.9 ", -(int64_t)1949*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 6, "-9.7 ", -(int64_t)9949*1024L, HN_DECIMAL, HN_AUTOSCALE, 6 },
 
 	/* Positive/negative, at maximum scale */
-	{ 5, "500 P", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "1.9 E", (int64_t)1949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "8.9 E", (int64_t)8949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 5, "9.2 E", INT64_MAX, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
+	{ 5, "500 P", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "1.9 E", (int64_t)1949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "8.9 E", (int64_t)8949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 5, "9.2 E", INT64_MAX, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
         /* Negatives work with latest rev only: */
-	{ 6, "-9.2 ", -INT64_MAX, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
-	{ 6, "-8.9 ", -(int64_t)8949*1000*1000*1000*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE },
+	{ 6, "-9.2 ", -INT64_MAX, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
+	{ 6, "-8.9 ", -(int64_t)8949*1000*1000*1000*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, HN_AUTOSCALE, 6 },
 
-	{ 5, "8.0 E",   INT64_MAX, HN_DECIMAL, HN_AUTOSCALE },
-	{ 5, "7.9 E",   INT64_MAX-(int64_t)100*1024*1024*1024*1024*1024LL, HN_DECIMAL, HN_AUTOSCALE },
-	{ 6, "-8.0 ", -INT64_MAX, HN_DECIMAL, HN_AUTOSCALE },
-	{ 6, "-7.9 ",   -INT64_MAX+(int64_t)100*1024*1024*1024*1024*1024LL, HN_DECIMAL, HN_AUTOSCALE },
+	{ 5, "8.0 E",   INT64_MAX, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 5, "7.9 E",   INT64_MAX-(int64_t)100*1024*1024*1024*1024*1024LL, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 6, "-8.0 ", -INT64_MAX, HN_DECIMAL, HN_AUTOSCALE, 6 },
+	{ 6, "-7.9 ",   -INT64_MAX+(int64_t)100*1024*1024*1024*1024*1024LL, HN_DECIMAL, HN_AUTOSCALE, 6 },
 
 	/* Positive, Fixed scales */
-	{ 5, "500 k", (int64_t)500*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1 },
-	{ 5, "0.5 M", (int64_t)500*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "949 k", (int64_t)949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1 },
-	{ 5, "0.9 M", (int64_t)949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "950 k", (int64_t)950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1 },
-	{ 5, "1.0 M", (int64_t)950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "999 k", (int64_t)999*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1 },
-	{ 5, "1.0 M", (int64_t)999*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "1.5 M", (int64_t)1500*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "1.9 M", (int64_t)1949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "2.0 M", (int64_t)1950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "9.9 M", (int64_t)9949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 4, "10 M", (int64_t)9950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "500 M", (int64_t)500*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "0.5 G", (int64_t)500*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 3 },
-	{ 5, "999 M", (int64_t)999*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2 },
-	{ 5, "1.0 G", (int64_t)999*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 3 },
+	{ 5, "500 k", (int64_t)500*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1, 6 },
+	{ 5, "0.5 M", (int64_t)500*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "949 k", (int64_t)949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1, 6 },
+	{ 5, "0.9 M", (int64_t)949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "950 k", (int64_t)950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1, 6 },
+	{ 5, "1.0 M", (int64_t)950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "999 k", (int64_t)999*1000L, HN_DECIMAL|HN_DIVISOR_1000, 1, 6 },
+	{ 5, "1.0 M", (int64_t)999*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "1.5 M", (int64_t)1500*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "1.9 M", (int64_t)1949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "2.0 M", (int64_t)1950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "9.9 M", (int64_t)9949*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 4, "10 M", (int64_t)9950*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "500 M", (int64_t)500*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "0.5 G", (int64_t)500*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 3, 6 },
+	{ 5, "999 M", (int64_t)999*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 2, 6 },
+	{ 5, "1.0 G", (int64_t)999*1000*1000L, HN_DECIMAL|HN_DIVISOR_1000, 3, 6 },
 	/* Positive/negative, at maximum scale */
-	{ 5, "500 P", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 5 },
-	{ 5, "1.0 E", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6 },
-	{ 5, "1.9 E", (int64_t)1949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6 },
-	{ 5, "8.9 E", (int64_t)8949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6 },
-	{ 5, "9.2 E", INT64_MAX, HN_DECIMAL|HN_DIVISOR_1000, 6 },
+	{ 5, "500 P", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 5, 6 },
+	{ 5, "1.0 E", (int64_t)500*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6, 6 },
+	{ 5, "1.9 E", (int64_t)1949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6, 6 },
+	{ 5, "8.9 E", (int64_t)8949*1000*1000*1000*1000*1000L, HN_DIVISOR_1000, 6, 6 },
+	{ 5, "9.2 E", INT64_MAX, HN_DECIMAL|HN_DIVISOR_1000, 6, 6 },
 
 	/* HN_DECIMAL + binary + fixed scale cases not completed */
-	{ 5, "512 K", (int64_t)512*1024L, HN_DECIMAL, 1 },
-	{ 5, "0.5 M", (int64_t)512*1024L, HN_DECIMAL, 2 },
+	{ 5, "512 K", (int64_t)512*1024L, HN_DECIMAL, 1, 6 },
+	{ 5, "0.5 M", (int64_t)512*1024L, HN_DECIMAL, 2, 6 },
 
 	/* Negative, Fixed scales */
         /* Not yet added, but should work with latest rev */
@@ -439,9 +443,9 @@ static struct {
  } flags[] = {
 	{ HN_AUTOSCALE, "HN_AUTOSCALE" },
 	{ HN_GETSCALE, "HN_GETSCALE" },
-	{ HN_DIVISOR_1000, "HN_DIVISOR_1000"},
-	{ HN_B, "HN_B"},
-	{ HN_DECIMAL, "HN_DECIMAL"},
+	{ HN_DIVISOR_1000, "HN_DIVISOR_1000" },
+	{ HN_B, "HN_B" },
+	{ HN_DECIMAL, "HN_DECIMAL" },
 };
 
 static const char *separator = "|";
@@ -496,13 +500,14 @@ main(int argc, char * const argv[])
 {
 	char *buf;
 	char *flag_str, *scale_str;
-	size_t buflen, errcnt, i, skipped, tested;
+	size_t blen, buflen, errcnt, i, skipped, tested;
 	int r;
 	int includeNegScale;
 	int includeExabyteTests;
 	int verbose;
 
-	buflen = 4;
+	buf = NULL;
+	buflen = 0;
 	includeNegScale = 0;
 	includeExabyteTests = 0;
 	verbose = 0;
@@ -510,7 +515,6 @@ main(int argc, char * const argv[])
 	read_options(argc, argv, &buflen, &includeNegScale,
 	    &includeExabyteTests, &verbose);
 
-	buf = malloc(buflen);
 	errcnt = 0;
 	tested = 0;
 	skipped = 0;
@@ -520,16 +524,8 @@ main(int argc, char * const argv[])
 
 	printf("1..%zu\n", nitems(test_args));
 	for (i = 0; i < nitems(test_args); i++) {
-		/* KLUDGE */
-		if (test_args[i].num == INT64_MAX && buflen == 4) {
-		        /* Start final tests which require buffer of 6 */
-		        free(buf);
-		        buflen = 6;
-                        buf = malloc(buflen);
-                        if (verbose)
-                                printf("Buffer length increased to %zu\n",
-				    buflen);
-		}
+		blen = (buflen > 0) ? buflen : test_args[i].buflen;
+		buf = realloc(buf, blen);
 
 		if (test_args[i].scale < 0 && ! includeNegScale) {
 			skipped++;
@@ -542,7 +538,7 @@ main(int argc, char * const argv[])
 			continue;
 		}
 
-		r = humanize_number(buf, buflen, test_args[i].num, "",
+		r = humanize_number(buf, blen, test_args[i].num, "",
 		    test_args[i].scale, test_args[i].flags);
 		flag_str = str_flags(test_args[i].flags, "[no flags]");
 		scale_str = str_scale(test_args[i].scale);
@@ -553,7 +549,7 @@ main(int argc, char * const argv[])
 				    "buflen: %zu, got: %d + \"%s\", "
 				    "expected %d + \"%s\"; num = %jd, "
 				    "scale = %s, flags= %s.\n",
-				    i, buflen, r, buf, test_args[i].retval,
+				    i, blen, r, buf, test_args[i].retval,
 				    test_args[i].res,
 				    (intmax_t)test_args[i].num,
 				    scale_str, flag_str);
@@ -565,10 +561,10 @@ main(int argc, char * const argv[])
 			if (verbose)
 				printf("result mismatch on index %zu, got: "
 				    "\"%s\", expected \"%s\"; num = %jd, "
-				    "scale = %s, flags= %s.\n",
+				    "buflen: %zu, scale = %s, flags= %s.\n",
 				    i, buf, test_args[i].res,
 				    (intmax_t)test_args[i].num,
-				    scale_str, flag_str);
+				    blen, scale_str, flag_str);
 			else
 				printf("not ok %zu # buf \"%s\" != \"%s\"\n",
 				    i + 1, buf, test_args[i].res);
@@ -577,15 +573,15 @@ main(int argc, char * const argv[])
 			if (verbose)
 				printf("successful result on index %zu, "
 				    "returned %d, got: \"%s\"; num = %jd, "
-				    "scale = %s, flags= %s.\n",
-				    i, r, buf,
-				    (intmax_t)test_args[i].num,
-				    scale_str, flag_str);
+				    "buflen = %zd, scale = %s, flags= %s.\n",
+				    i, r, buf, (intmax_t)test_args[i].num,
+				    blen, scale_str, flag_str);
 			else
 				printf("ok %zu\n", i + 1);
 		}
 		tested++;
 	}
+	free(buf);
 
 	if (verbose)
 		printf("total errors: %zu/%zu tests, %zu skipped\n", errcnt,


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