the begginning

utils/mysqlcl_idb/state.cc

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+/*
+ * Drizzle Client & Protocol Library
+ *
+ * Copyright (C) 2008 Eric Day (eday@oddments.org)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ *     * The names of its contributors may not be used to endorse or
+ * promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/**
+ * @file
+ * @brief State machine definitions
+ */
+
+#include <libdrizzle-2.0/common.h>
+
+drizzle_return_t drizzle_state_loop(drizzle_con_st *con)
+{
+  while (drizzle_state_none(con) == false)
+  {
+    drizzle_return_t ret= con->state_stack[con->state_current - 1](con);
+    if (ret != DRIZZLE_RETURN_OK)
+    {
+      if (ret != DRIZZLE_RETURN_IO_WAIT && ret != DRIZZLE_RETURN_PAUSE &&
+          ret != DRIZZLE_RETURN_ERROR_CODE)
+      {
+        drizzle_con_close(con);
+      }
+
+      return ret;
+    }
+  }
+
+  return DRIZZLE_RETURN_OK;
+}
+
+drizzle_return_t drizzle_state_packet_read(drizzle_con_st *con)
+{
+  drizzle_log_debug(con->drizzle, "drizzle_state_packet_read");
+
+  if (con->buffer_size < 4)
+  {
+    drizzle_state_push(con, drizzle_state_read);
+    return DRIZZLE_RETURN_OK;
+  }
+
+  con->packet_size= drizzle_get_byte3(con->buffer_ptr);
+
+  if (con->packet_number != con->buffer_ptr[3])
+  {
+    drizzle_set_error(con->drizzle, "drizzle_state_packet_read",
+                      "bad packet number:%u:%u", con->packet_number,
+                      con->buffer_ptr[3]);
+    return DRIZZLE_RETURN_BAD_PACKET_NUMBER;
+  }
+
+  drizzle_log_debug(con->drizzle, "packet_size= %zu, packet_number= %u",
+                    con->packet_size, con->packet_number);
+
+  con->packet_number++;
+
+  con->buffer_ptr+= 4;
+  con->buffer_size-= 4;
+
+  drizzle_state_pop(con);
+  return DRIZZLE_RETURN_OK;
+}