From: Jim Meyering <jim@meyering.net>
Date: Tue, 2 Jan 2001 07:18:56 +0000 (+0000)
Subject: (print_long_format):
X-Git-Tag: FILEUTILS-4_0_36~111
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1efbe325bda465bab5f532359381a9e996eed93a;p=thirdparty%2Fcoreutils.git

(print_long_format):
Report the year for files even slightly in the future.
Avoid overflow problems near Y2038 on 32-bit hosts.
To calculate "six months", take half the average Gregorian
year, not 180 days.
---

diff --git a/src/ls.c b/src/ls.c
index fd85ef2f01..4b17742f19 100644
--- a/src/ls.c
+++ b/src/ls.c
@@ -2445,13 +2445,19 @@ print_long_format (const struct fileinfo *f)
 
   if ((when_local = localtime (&when)))
     {
-      /* The file is recent if it is neither old nor in the future.
-	 POSIX says the cutoff is 6 months old;
-	 approximate this by 6*30 days.
-	 Allow a 1 hour slop factor for what is considered "the future",
-	 to allow for NFS server/client clock disagreement.  */
-      int recent = (current_time <= when + 6L * 30L * 24L * 60L * 60L
-		    && when - 60L * 60L <= current_time);
+      /* If the file appears to be in the future, update the current
+	 time, in case the file happens to have been modified since
+	 the last time we checked the clock.  */
+      time_t now = (current_time < when
+		    ? (current_time = time (NULL))
+		    : current_time);
+
+      /* Consider a time to be recent if it is within the past six
+	 months.  A Gregorian year has 365.2425 * 24 * 60 * 60 ==
+	 31556952 seconds on the average.  Write this value as an
+	 integer constant to avoid floating point hassles.  */
+      time_t six_months_ago = now - 31556952 / 2;
+      int recent = six_months_ago <= when && when <= now;
 
       char const *fmt = long_time_format[recent];
       *p = '\1';