stat: use e.g. %.3X instead of %X.%3:X for sub-second precision

* NEWS: Document this.
* doc/coreutils.texi (stat invocation): Likewise.
* gl/lib/fstimeprec.c, gl/lib/fstimeprec.h, gl/modules/fstimeprec:
* gl/modules/fstimeprec-tests, gl/tests/test-fstimeprec.c:
New files.
* bootstrap.conf (gnulib_modules): Add fstimeprec.
* src/stat.c: Include fstimeprec.h.  Don't include xstrtol.h.
(decimal_point, decimal_point_len): New static vars.
(main): Initialize them.
(epoch_sec, out_ns): Remove.
(out_int, out_uint): Now returns whatever printf returned.
(out_minus_zero, out_epoch_secs): New functions.
(print_stat): Use out_epoch_sec instead of out_ns and epoch_sec.
(print_stat, print_it, usage): Remove the %:X-style formats.
* tests/misc/stat-nanoseconds: Set TZ=UTC0 to avoid problems
with weird time zones.  Use a time stamp near the Epoch so that we
don't have to worry about leap seconds.  Redo test cases to match
new behavior.
* tests/touch/60-seconds: Change %Y.%:Y to %.9Y, to adjust to
new behavior.

1 files changed, 74 insertions, 0 deletions

diff --git a/gl/tests/test-fstimeprec.c b/gl/tests/test-fstimeprec.c
new file mode 100644
index 000000000..f699139df
--- /dev/null
+++ b/gl/tests/test-fstimeprec.c
@@ -0,0 +1,74 @@
+/* Test the fstimeprec module.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* written by Paul Eggert */
+
+#include <config.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+#define ASSERT(expr) \
+  do                                                                         \
+    {                                                                        \
+      if (!(expr))                                                           \
+        {                                                                    \
+          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);                                                   \
+          abort ();                                                          \
+        }                                                                    \
+    }                                                                        \
+  while (0)
+
+#include "fstimeprec.h"
+
+static int
+fstimeprec_file (struct fstimeprec *tab, char const *file)
+{
+  struct stat st;
+  if (stat (file, &st) != 0)
+    return 0;
+  return fstimeprec (tab, &st);
+}
+
+int
+main (void)
+{
+  struct fstimeprec *tab = fstimeprec_alloc ();
+  ASSERT (tab);
+
+  int m1 = fstimeprec_file (tab, "/");
+  int m2 = fstimeprec_file (tab, ".");
+  int m3 = fstimeprec_file (tab, "..");
+  ASSERT (0 <= m1 && m1 <= 9);
+  ASSERT (0 <= m2 && m2 <= 9);
+  ASSERT (0 <= m3 && m3 <= 9);
+
+  int n1 = fstimeprec_file (tab, "/");
+  int n2 = fstimeprec_file (tab, ".");
+  int n3 = fstimeprec_file (tab, "..");
+  ASSERT (0 <= n1 && n1 <= 9);
+  ASSERT (0 <= n2 && n2 <= 9);
+  ASSERT (0 <= n3 && n3 <= 9);
+
+  ASSERT (m1 <= n1);
+  ASSERT (m2 <= n2);
+  ASSERT (m3 <= n3);
+
+  fstimeprec_free (tab);
+
+  return 0;
+}