re PR libstdc++/7220 (g++ 3.1: basic_istream::ignore(0,delimiter) issue.)

2002-07-25  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/7220
	* include/bits/istream.tcc (istream::ignore): Don't extract on
	zero.
	* testsuite/27_io/istream_unformatted.cc (test10): Add.

From-SVN: r55763

libstdc++-v3/ChangeLog

 2002-07-25  Benjamin Kosnik  <bkoz@redhat.com>
 
+	PR libstdc++/7220
+	* include/bits/istream.tcc (istream::ignore): Don't extract on
+	zero.
+	* testsuite/27_io/istream_unformatted.cc (test10): Add.
+	
+2002-07-25  Benjamin Kosnik  <bkoz@redhat.com>
+
 	* testsuite/27_io/ios_base_type.cc: Move to...
 	* testsuite/27_io/ios_base_types.cc: ...here.
 	

libstdc++-v3/include/bits/istream.tcc

@@ -708,7 +708,7 @@ namespace std
     {
       _M_gcount = 0;
       sentry __cerb(*this, true);
-      if (__cerb) 
+      if (__cerb && __n > 0) 
 	{
 	  try 
 	    {

libstdc++-v3/testsuite/27_io/istream_unformatted.cc

@@ -514,6 +514,43 @@ test09()
   VERIFY( test );
 }
 
+// libstdc++/70220
+void
+test10()
+{
+  using namespace std;
+  bool test = true;
+  typedef string string_type;
+  typedef stringbuf stringbuf_type;
+  typedef istream istream_type;
+
+  int res = 0;
+  streamsize n;
+  string_type  input("abcdefg\n");
+  stringbuf_type sbuf(input);
+  istream_type  istr(&sbuf);
+  
+  istr.ignore(0);
+  if (istr.gcount() != 0) 
+    test = false;
+  VERIFY( test );
+  
+  istr.ignore(0, 'b');
+  if (istr.gcount() != 0) 
+    test = false;
+  VERIFY( test );
+  
+  istr.ignore();	// Advance to next position.
+  istr.ignore(0, 'b');
+  if ((n=istr.gcount()) != 0) 
+    test = false;
+  VERIFY( test );
+  
+  if (istr.peek() != 'b')
+    test = false;
+  VERIFY( test );
+}
+
 int 
 main()
 {
@@ -526,6 +563,7 @@ main()
   test07();
   test08();
   test09();
+  test10();
 
   return 0;
 }