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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* 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 Command definitions
*/
#include "config.h"
#include "libdrizzle/common.h"
/*
* State Definitions
*/
drizzle_return_t drizzle_state_command_write(drizzle_st *con)
{
unsigned char *start;
unsigned char *ptr;
drizzle_return_t ret;
if (con == NULL)
{
return DRIZZLE_RETURN_INVALID_ARGUMENT;
}
drizzle_log_debug(con, "drizzle_state_command_write");
if (con->command_data == NULL && con->command_total != 0 &&
con->command != DRIZZLE_COMMAND_CHANGE_USER)
{
return DRIZZLE_RETURN_PAUSE;
}
if (con->buffer_size == 0)
{
con->buffer_ptr= con->buffer;
start= con->buffer;
}
else
{
start= con->buffer_ptr + con->buffer_size;
}
if (con->command_offset == 0)
{
size_t free_size;
/* Make sure we can fit the largest non-streaming packet, currently a
DRIZZLE_COMMAND_CHANGE_USER command. */
con->packet_size= 1 /* Command */
+ strlen(con->user) + 1
+ 1 /* Scramble size */
+ DRIZZLE_MAX_SCRAMBLE_SIZE
+ strlen(con->db) + 1;
/* Flush buffer if there is not enough room. */
free_size= (size_t)DRIZZLE_MAX_BUFFER_SIZE - (size_t)(start - con->buffer);
if (free_size < con->packet_size)
{
drizzle_state_push(con, drizzle_state_write);
return DRIZZLE_RETURN_OK;
}
/* Store packet size at the end since it may change. */
con->packet_number= 1;
ptr= start;
ptr[3]= 0;
ptr[4]= (unsigned char)(con->command);
ptr+= 5;
if (con->command == DRIZZLE_COMMAND_CHANGE_USER)
{
ptr= drizzle_pack_auth(con, ptr, &ret);
if (ret != DRIZZLE_RETURN_OK)
return ret;
con->buffer_size+= (4 + con->packet_size);
}
else if (con->command_total == 0)
{
con->packet_size= 1;
con->buffer_size+= 5;
}
else
{
con->packet_size= 1 + con->command_total;
free_size-= 5;
/* Copy as much of the data in as we can into the write buffer. */
if (con->command_size <= free_size)
{
memcpy(ptr, con->command_data, con->command_size);
con->command_offset= con->command_size;
con->command_data= NULL;
con->buffer_size+= 5 + con->command_size;
}
else
{
memcpy(ptr, con->command_data, free_size);
con->command_offset= free_size;
con->command_data+= free_size;
con->command_size-= free_size;
con->buffer_size+= 5 + free_size;
}
}
/* Store packet size now. */
drizzle_set_byte3(start, con->packet_size);
}
else
{
/* Write directly from the caller buffer for the rest. */
con->buffer_ptr= con->command_data;
con->buffer_size= con->command_size;
con->command_offset+= con->command_size;
con->command_data= NULL;
}
if (con->command_offset == con->command_total)
{
drizzle_state_pop(con);
if (!(con->options & (DRIZZLE_CON_RAW_PACKET |
DRIZZLE_CON_NO_RESULT_READ)) &&
con->command != DRIZZLE_COMMAND_FIELD_LIST)
{
drizzle_state_push(con, drizzle_state_result_read);
drizzle_state_push(con, drizzle_state_packet_read);
}
}
drizzle_state_push(con, drizzle_state_write);
return DRIZZLE_RETURN_OK;
}
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