usa	2019-01-31 19:59:53 +0900 (Thu, 31 Jan 2019)

  New Revision: 66967

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66967

  Log:
    merge revision(s) 65974: [Backport #15340]
    
    Normalize month-mday before finding epoch
    
    Especially over the year 2038, 30 Feb and so on may cause odd behavior
    on validating found epoch with given year-month-day [Bug #15340]

  Modified directories:
    branches/ruby_2_4/
  Modified files:
    branches/ruby_2_4/test/ruby/test_time.rb
    branches/ruby_2_4/time.c
    branches/ruby_2_4/version.h
Index: ruby_2_4/time.c
===================================================================
--- ruby_2_4/time.c	(revision 66966)
+++ ruby_2_4/time.c	(revision 66967)
@@ -2574,6 +2574,29 @@ time_arg(int argc, VALUE *argv, struct v https://github.com/ruby/ruby/blob/trunk/ruby_2_4/time.c#L2574
 	vtm->mday = obj2ubits(v[2], 5);
     }
 
+    /* normalize month-mday */
+    switch (vtm->mon) {
+      case 2:
+        {
+            /* this drops higher bits but it's not a problem to calc leap year */
+            unsigned int mday2 = leap_year_v_p(vtm->year) ? 29 : 28;
+            if (vtm->mday > mday2) {
+                vtm->mday -= mday2;
+                vtm->mon++;
+            }
+        }
+        break;
+      case 4:
+      case 6:
+      case 9:
+      case 11:
+        if (vtm->mday == 31) {
+            vtm->mon++;
+            vtm->mday = 1;
+        }
+        break;
+    }
+
     vtm->hour = NIL_P(v[3])?0:obj2ubits(v[3], 5);
 
     vtm->min  = NIL_P(v[4])?0:obj2ubits(v[4], 6);
Index: ruby_2_4/version.h
===================================================================
--- ruby_2_4/version.h	(revision 66966)
+++ ruby_2_4/version.h	(revision 66967)
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/ruby_2_4/version.h#L1
 #define RUBY_VERSION "2.4.6"
 #define RUBY_RELEASE_DATE "2019-01-31"
-#define RUBY_PATCHLEVEL 342
+#define RUBY_PATCHLEVEL 343
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 1
Index: ruby_2_4/test/ruby/test_time.rb
===================================================================
--- ruby_2_4/test/ruby/test_time.rb	(revision 66966)
+++ ruby_2_4/test/ruby/test_time.rb	(revision 66967)
@@ -1043,6 +1043,29 @@ class TestTime < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/ruby_2_4/test/ruby/test_time.rb#L1043
       assert_equal(min, t.min)
       assert_equal(sec, t.sec)
     }
+    assert_equal(Time.local(2038,3,1), Time.local(2038,2,29))
+    assert_equal(Time.local(2038,3,2), Time.local(2038,2,30))
+    assert_equal(Time.local(2038,3,3), Time.local(2038,2,31))
+    assert_equal(Time.local(2040,2,29), Time.local(2040,2,29))
+    assert_equal(Time.local(2040,3,1), Time.local(2040,2,30))
+    assert_equal(Time.local(2040,3,2), Time.local(2040,2,31))
+    n = 2 ** 64
+    n += 400 - n % 400 # n is over 2^64 and multiple of 400
+    assert_equal(Time.local(n,2,29),Time.local(n,2,29))
+    assert_equal(Time.local(n,3,1), Time.local(n,2,30))
+    assert_equal(Time.local(n,3,2), Time.local(n,2,31))
+    n += 100
+    assert_equal(Time.local(n,3,1), Time.local(n,2,29))
+    assert_equal(Time.local(n,3,2), Time.local(n,2,30))
+    assert_equal(Time.local(n,3,3), Time.local(n,2,31))
+    n += 4
+    assert_equal(Time.local(n,2,29),Time.local(n,2,29))
+    assert_equal(Time.local(n,3,1), Time.local(n,2,30))
+    assert_equal(Time.local(n,3,2), Time.local(n,2,31))
+    n += 1
+    assert_equal(Time.local(n,3,1), Time.local(n,2,29))
+    assert_equal(Time.local(n,3,2), Time.local(n,2,30))
+    assert_equal(Time.local(n,3,3), Time.local(n,2,31))
   end
 
   def test_future
Index: ruby_2_4
===================================================================
--- ruby_2_4	(revision 66966)
+++ ruby_2_4	(revision 66967)

Property changes on: ruby_2_4
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /trunk:r65974

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