re PR libstdc++/13217 (basic_filebuf::underflow doesn't deal gracefully with read errors)

2003-12-10  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/13217
	* include/bits/fstream.tcc (underflow): Deal gracefully with
	read errors: throw ios_base::failure.

From-SVN: r74506

libstdc++-v3/ChangeLog

+2003-12-10  Paolo Carlini  <pcarlini@suse.de>
+
+	PR libstdc++/13217
+	* include/bits/fstream.tcc (underflow): Deal gracefully with
+	read errors: throw ios_base::failure.
+
 2003-12-10  Benjamin Kosnik  <bkoz@redhat.com>
 
 	PR libstdc++/10063
@@ -358,7 +364,7 @@
 
 	PR libstdc++/11544
 	PR libstdc++/11603
-	* include/bits/fstream.tcc (underflow): Throw ios_base:failure
+	* include/bits/fstream.tcc (underflow): Throw ios_base::failure
 	upon incomplete or invalid byte sequences in the file.
 	* testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-1.cc: New.
 	* testsuite/27_io/basic_filebuf/underflow/wchar_t/11544-2.cc: New.

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

@@ -258,6 +258,8 @@ namespace std
 		      streamsize __elen = _M_file.xsgetn(_M_ext_end, __rlen);
 		      if (__elen == 0)
 			__got_eof = true;
+		      else if (__elen == -1)
+			break;
 		      _M_ext_end += __elen;
 		    }
 
@@ -306,9 +308,12 @@ namespace std
 		__throw_ios_failure("basic_filebuf::underflow "
 				    "incomplete character in file");
 	    }
-	  else
+	  else if (__r == codecvt_base::error)
 	    __throw_ios_failure("basic_filebuf::underflow "
 				"invalid byte sequence in file");
+	  else
+	    __throw_ios_failure("basic_filebuf::underflow "
+				"error reading the file");	    
 	}
       return __ret;
     }