Make sure we wait for protocol-level EOF when ending binary COPY IN.

The previous coding just terminated the COPY immediately after seeing
the EOF marker (-1 where a row field count is expected).  The expected
CopyDone or CopyFail message just got thrown away later, since we weren't
in COPY mode anymore.  This behavior complicated matters for the JDBC
driver, and arguably was the wrong thing in any case since a CopyFail
message after the marker wouldn't be honored.

Note that there is a behavioral change here: extra data after the EOF
marker was silently ignored before, but now it will cause an error.
Hence not back-patching, although this is arguably a bug.

Per report and patch by Kris Jurka.

Author: tglsfdc

src/backend/commands/copy.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.329 2010/08/13 20:10:50 rhaas Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.330 2010/09/18 20:10:15 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2058,9 +2058,34 @@ CopyFrom(CopyState cstate)
 			int16		fld_count;
 			ListCell   *cur;
 
-			if (!CopyGetInt16(cstate, &fld_count) ||
-				fld_count == -1)
+			if (!CopyGetInt16(cstate, &fld_count))
 			{
+				/* EOF detected (end of file, or protocol-level EOF) */
+				done = true;
+				break;
+			}
+			
+			if (fld_count == -1)
+			{
+				/*
+				 * Received EOF marker.  In a V3-protocol copy, wait for
+				 * the protocol-level EOF, and complain if it doesn't come
+				 * immediately.  This ensures that we correctly handle
+				 * CopyFail, if client chooses to send that now.
+				 *
+				 * Note that we MUST NOT try to read more data in an
+				 * old-protocol copy, since there is no protocol-level EOF
+				 * marker then.  We could go either way for copy from file,
+				 * but choose to throw error if there's data after the EOF
+				 * marker, for consistency with the new-protocol case.
+				 */
+				char	dummy;
+
+				if (cstate->copy_dest != COPY_OLD_FE &&
+					CopyGetData(cstate, &dummy, 1, 1) > 0)
+					ereport(ERROR,
+							(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+							 errmsg("received copy data after EOF marker")));
 				done = true;
 				break;
 			}