[ruby/csv] Fix a bug that all of ARGF contents may not be consumed

GitHub: fix GH-228

Reported by Rafael Navaza. Thanks!!!

https://github.com/ruby/csv/commit/81f595b6a1

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/csv/parser.rb b/lib/csv/parser.rb
index f87db3bb12..ef33a69478 100644
--- a/lib/csv/parser.rb
+++ b/lib/csv/parser.rb
@@ -768,7 +768,10 @@ class CSV
         string = nil
         if @samples.empty? and @input.is_a?(StringIO)
           string = @input.read
-        elsif @samples.size == 1 and @input.respond_to?(:eof?) and @input.eof?
+        elsif @samples.size == 1 and
+              @input != ARGF and
+              @input.respond_to?(:eof?) and
+              @input.eof?
           string = @samples[0]
         end
         if string