io.c: update argf lineno

* io.c (argf_rewind): rewind line number in non-global ARGF
  instance.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57125 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

io.c

@@ -11098,11 +11098,19 @@ argf_set_pos(VALUE argf, VALUE offset)
 static VALUE
 argf_rewind(VALUE argf)
 {
+    VALUE ret;
+    int old_lineno;
+
     if (!next_argv()) {
 	rb_raise(rb_eArgError, "no stream to rewind");
     }
     ARGF_FORWARD(0, 0);
-    return rb_io_rewind(ARGF.current_file);
+    old_lineno = RFILE(ARGF.current_file)->fptr->lineno;
+    ret = rb_io_rewind(ARGF.current_file);
+    if (!global_argf_p(argf)) {
+	ARGF.last_lineno = ARGF.lineno -= old_lineno;
+    }
+    return ret;
 }
 
 /*

test/ruby/test_argf.rb

@@ -78,15 +78,15 @@ class TestArgf < Test::Unit::TestCase
       p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["2", 2, "2", 2]
       a.rewind
       b.rewind
-      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["1", 1, "1", 3]
-      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["2", 2, "2", 4]
-      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["3", 3, "3", 5]
-      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["4", 4, "4", 6]
-      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["5", 5, "5", 7]
+      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["1", 1, "1", 1]
+      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["2", 2, "2", 2]
+      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["3", 3, "3", 3]
+      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["4", 4, "4", 4]
+      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["5", 5, "5", 5]
       a.rewind
       b.rewind
-      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["5", 5, "5", 8]
-      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["6", 6, "6", 9]
+      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["5", 5, "5", 5]
+      p [a.gets.chomp, a.lineno, b.gets.chomp, b.lineno] #=> ["6", 6, "6", 6]
     SRC
   end
 
@@ -144,6 +144,9 @@ class TestArgf < Test::Unit::TestCase
     assert_equal(3, f.lineno)
     assert_equal((1..3).map {|i| [i, "#{i}\n"]}, result)
 
+    f.rewind
+    assert_equal(2, f.lineno)
+
     f = ARGF.class.new(@t1.path, @t2.path, @t3.path)
     f.each_char.to_a
     assert_equal(0, f.lineno)