numfmt: add support for new SI prefixes

* src/dd, src/head.c, src/od.c, src/sort.c, src/stdbuf.c, src/tail.c:
(usage):
* src/system.h (emit_size_note):
Mention new SI prefixes.
* src/du.c (main):
* src/head.c (head_file):
* src/numfmt.c (suffix_power, suffix_power_char, prepare_padded_number):
* src/shred.c (main):
* src/sort.c (unit_order):
* src/tail.c (parse_options):
Support new SI prefixes.
* src/numfmt.c (MAX_ACCEPTABLE_DIGITS): Increase to 33.
(zero_and_valid_suffixes, valid_suffixes): New constants,
with new SI prefixes.
(valid_suffix, unit_to_umax): Use them.
(prepare_padded_number): Diagnose "999Q" instead of "999Y".
* tests/misc/numfmt.pl, tests/misc/sort.pl:
Adjust tests to match new max.

1 files changed, 6 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 04ee933c0..52c92ddb4 100644
--- a/NEWS
+++ b/NEWS
@@ -48,6 +48,12 @@ GNU coreutils NEWS                                    -*- outline -*-
 
 ** Changes in behavior
 
+  Programs now use the new SI prefixes R (10**27) and Q (10**30)
+  along with their binary counterparts Ri (2**90) and Qi (2**100).
+  In some cases (e.g., 'sort -h') these new prefixes simply work;
+  in others, where they exceed integer width limits, they now elicit
+  the same integer overflow diagnostics as other large prefixes.
+
   'cp --reflink=always A B' no longer leaves behind a newly created
   empty file B merely because copy-on-write clones are not supported.