merge revision(s) 2f1895fa: [Backport #16767]

Fixed formatted substring expansion [Bug #16767]

	---
	 strftime.c             | 2 ++
	 test/ruby/test_time.rb | 7 +++++++
	 2 files changed, 9 insertions(+)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

strftime.c

@@ -326,7 +326,9 @@ rb_strftime_with_timespec(VALUE ftime, const char *format, size_t format_len,
 			s += len; \
 			if (i > 0) case_conv(s, i, flags); \
 			if (precision > i) {\
+				s += i; \
 				NEEDS(precision); \
+				s -= i; \
 				memmove(s + precision - i, s, i);\
 				memset(s, padding ? padding : ' ', precision - i); \
 				s += precision;	\

test/ruby/test_time.rb

@@ -851,6 +851,13 @@ class TestTime < Test::Unit::TestCase
     assert_equal(8192, Time.now.strftime('%8192z').size)
   end
 
+  def test_strftime_wide_precision
+    t2000 = get_t2000
+    s = t2000.strftime("%28c")
+    assert_equal(28, s.size)
+    assert_equal(t2000.strftime("%c"), s.strip)
+  end
+
   def test_strfimte_zoneoffset
     t2000 = get_t2000
     t = t2000.getlocal("+09:00:00")

version.h

@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.6.7"
 #define RUBY_RELEASE_DATE "2021-04-05"
-#define RUBY_PATCHLEVEL 175
+#define RUBY_PATCHLEVEL 176
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 4