Use high-precision timestamps for manual pages

* lib/util.c (is_changed): Compare high-precision timestamps.
* libdb/db_storage.h (FIELDS): Increment to 10.
(struct mandata): Change "time_t _st_mtime" to "struct timespec
mtime".
* libdb/db_lookup.c (dbprintf): Update mtime display.
(split_content): Store two fields for the mtime (seconds and
nanoseconds).
(make_content): Expect two fields for the mtime.
* libdb/db_store.c (replace_if_necessary): Compare high-precision
timestamps.
* src/check_mandirs.c (test_manfile): Likewise.
* src/man.c (maybe_update_file): Likewise.
* src/straycats.c (check_for_stray): Update initialisation of struct
mandata.
* src/tests/testlib.sh (accessdb_filter): Adjust for new format.
* manual/db.me (Contents of an index database): Describe new format.
(Example database): Update example output.
* NEWS: Document this.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/util.c b/lib/util.c
index 978a16e4..faa5d643 100644
--- a/lib/util.c
+++ b/lib/util.c
@@ -44,6 +44,8 @@
 #include <unistd.h>
 #include <locale.h>
 
+#include "stat-time.h"
+#include "timespec.h"
 #include "xvasprintf.h"
 
 #include "gettext.h"
@@ -97,7 +99,8 @@ int is_changed (const char *fa, const char *fb)
 	if (fb_sb.st_size == 0)
 		status |= 4;
 
-	status |= (fa_sb.st_mtime != fb_sb.st_mtime);
+	status |= (timespec_cmp (get_stat_mtime (&fa_sb),
+				 get_stat_mtime (&fb_sb)) != 0);
 
 	debug (" (%d)\n", status);
 	return status;