stat: revert %X-%Y-%Z change; use e.g., %:X to print fractional seconds

This reverts part of the recent commit 9069af45,
"stat: print timestamps to full resolution", which made %X, %Y, %Z
print floating point numbers.  We prefer to retain portability of
%X, %Y and %Z uses, while still providing access to full-resolution
time stamps via modified format strings.  Also make the new
%W consistent.
* src/stat.c: Include "xstrtol.h".
(print_it): Accept a new %...:[XYZ] format directive,
e.g., %:X, to print the nanoseconds portion of the corresponding time.
For example, %3.3:Y prints the zero-padded, truncated, milliseconds
part of the time of last modification.
(print_it): Update print_func signature to match.
(neg_to_zero): New helper function.
(epoch_time): Remove function; replace with...
(epoch_sec): New function; use timetostr.
(out_ns): New function.  Use "09" only when no other modifier
is specified.
(print_statfs): Change type of "m" to unsigned int,
now that it must accommodate values larger than 255.
(print_stat): Likewise.
Map :X to a code of 'X' + 256.  Likewise for Y, Z and W.
(usage): Update.
* tests/touch/60-seconds: Use %Y.%:Y in place of %Y.
* tests/misc/stat-nanoseconds: New file.
* tests/Makefile.am (TESTS): Add it.
* NEWS (Changes in behavior): Mention this.
With improvements by Pádraig Brady.
Thanks to Andreas Schwab for raising the issue.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/touch/60-seconds b/tests/touch/60-seconds
index f98f0c5d1..d0082967c 100755
--- a/tests/touch/60-seconds
+++ b/tests/touch/60-seconds
@@ -30,7 +30,7 @@ echo 60.000000000 > exp || framework_failure
 # an `invalid date format'.  Specifying 60 seconds *is* valid.
 TZ=UTC0 touch -t 197001010000.60 f || fail=1
 
-stat --p='%Y\n' f > out || fail=1
+stat --p='%Y.%:Y\n' f > out || fail=1
 
 compare out exp || fail=1