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changeset 1761:14b8e8de40c8

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(get_date): Reuse tm_isdst of first localtime call; this is an improvement on a bug fix suggested by martin@dresden.nacamar.de. Do not assume that localtime and gmtime return non-null. From Paul Eggert.
author Jim Meyering <jim@meyering.net>
date Sun, 28 Mar 1999 20:58:51 +0000
parents b9e8f52f49b4
children 9e049b469983
files lib/getdate.y
diffstat 1 files changed, 8 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/lib/getdate.y
+++ b/lib/getdate.y
@@ -906,12 +906,15 @@
   yyInput = p;
   Start = now ? *now : time ((time_t *) NULL);
   tmp = localtime (&Start);
+  if (!tmp)
+    return -1;
   yyYear = tmp->tm_year + TM_YEAR_ORIGIN;
   yyMonth = tmp->tm_mon + 1;
   yyDay = tmp->tm_mday;
   yyHour = tmp->tm_hour;
   yyMinutes = tmp->tm_min;
   yySeconds = tmp->tm_sec;
+  tm.tm_isdst = tmp->tm_isdst;
   yyMeridian = MER24;
   yyRelSeconds = 0;
   yyRelMinutes = 0;
@@ -947,7 +950,6 @@
   tm.tm_hour += yyRelHour;
   tm.tm_min += yyRelMinutes;
   tm.tm_sec += yyRelSeconds;
-  tm.tm_isdst = -1;
   tm0 = tm;
 
   Start = mktime (&tm);
@@ -994,7 +996,11 @@
 
   if (yyHaveZone)
     {
-      long delta = yyTimezone * 60L + difftm (&tm, gmtime (&Start));
+      long delta;
+      struct tm *gmt = gmtime (&Start);
+      if (!gmt)
+	return -1;
+      delta = yyTimezone * 60L + difftm (&tm, gmt);
       if ((Start + delta < Start) != (delta < 0))
 	return -1;		/* time_t overflow */
       Start += delta;