* time.c (search_time_t): limit guess range by mktime if it is

  available.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@6050 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/time.c b/time.c
index d72d3a42b9..a81c3bb789 100644
--- a/time.c
+++ b/time.c
@@ -440,6 +440,15 @@ search_time_t(tptr, utc_p)
                (1UL << (8 * sizeof(time_t) - 1)) - 1 :
 	       ~(time_t)0;
 
+#if defined(HAVE_MKTIME)
+    if ((guess = mktime(tptr)) != -1) {
+      if (guess_lo < guess - 24 * 60 * 60)
+        guess_lo = guess - 24 * 60 * 60;
+      if (guess + 24 * 60 * 60 < guess_hi)
+        guess_hi = guess + 24 * 60 * 60;
+    }
+#endif
+
     tm = (utc_p ? gmtime : localtime)(&guess_lo);
     if (!tm) goto error;
     d = tmcmp(tptr, tm);