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

kou · kou · commit 56a5ae9f5292 · 2021-12-24T14:35:33.000+09:00
GitHub: fix GH-228 Reported by Rafael Navaza. Thanks!!! ruby/csv@81f595b6a1
diff --git a/lib/csv/parser.rb b/lib/csv/parser.rb
@@ -768,7 +768,10 @@ def build_scanner
         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
