Bug #31060: MySQL CLI parser bug 2

There was a problem when a DELIMITER COMMAND is not the first 
command on the line. I this case an extra line feed was added
to the glob buffer and this was causing subsequent attempts 
to enter this delimiter to fail.
Fixed by not adding a new line to the glob buffer if the 
command being added is a DELIMITER

client/mysql.cc:
  Bug #31060: Don't add a new line if DELIMTER is added to
  the glob buffer
mysql-test/r/mysql.result:
  Bug #31060: test case
mysql-test/t/mysql.test:
  Bug #31060: test case

client/mysql.cc

@@ -2222,8 +2222,22 @@ static bool add_line(String &buffer,char *line,char *in_string,
   }
   if (out != line || !buffer.is_empty())
   {
-    *out++='\n';
     uint length=(uint) (out-line);
+
+    if (length < 9 || 
+        my_strnncoll (charset_info, 
+                      (uchar *)line, 9, (const uchar *) "delimiter", 9))
+    {
+      /* 
+        Don't add a new line in case there's a DELIMITER command to be 
+        added to the glob buffer (e.g. on processing a line like 
+        "<command>;DELIMITER <non-eof>") : similar to how a new line is 
+        not added in the case when the DELIMITER is the first command 
+        entered with an empty glob buffer. 
+      */
+      *out++='\n';
+      length++;
+    }
     if (buffer.length() + length >= buffer.alloced_length())
       buffer.realloc(buffer.length()+length+IO_SIZE);
     if ((!*ml_comment || preserve_comments) && buffer.append(line, length))

mysql-test/r/mysql.result

@@ -188,4 +188,8 @@ delimiter
 2
 @z:='1'	@z=database()
 1	NULL
+1
+1
+1
+1
 End of 5.0 tests

mysql-test/t/mysql.test

@@ -314,4 +314,21 @@ remove_file $MYSQLTEST_VARDIR/tmp/bug38158.sql;
 #
 --exec $MYSQL -e "select @z:='1',@z=database()"
 
+
+#
+# Bug #31060: MySQL CLI parser bug 2
+#
+
+--write_file $MYSQLTEST_VARDIR/tmp/bug31060.sql
+;DELIMITER DELIMITER
+;
+SELECT 1DELIMITER
+DELIMITER ;
+SELECT 1;
+EOF
+
+--exec $MYSQL < $MYSQLTEST_VARDIR/tmp/bug31060.sql 2>&1
+
+remove_file $MYSQLTEST_VARDIR/tmp/bug31060.sql;
+
 --echo End of 5.0 tests