libmysql.c

/* Copyright (C) 2000-2004 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation.

   There are special exceptions to the terms and conditions of the GPL as it
   is applied to this software. View the full text of the exception in file
   EXCEPTIONS-CLIENT in the directory of this software distribution.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include <my_global.h>
#include <my_sys.h>
#include <my_time.h>
#include <mysys_err.h>
#include <m_string.h>
#include <m_ctype.h>
#include "mysql.h"
#include "mysql_version.h"
#include "mysqld_error.h"
#include "errmsg.h"
#include <violite.h>
#include <sys/stat.h>
#include <signal.h>
#include <time.h>
#ifdef	 HAVE_PWD_H
#include <pwd.h>
#endif
#if !defined(MSDOS) && !defined(__WIN__)
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef HAVE_SELECT_H
#include <select.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif /* !defined(MSDOS) && !defined(__WIN__) */
#ifdef HAVE_POLL
#include <sys/poll.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#if defined(THREAD) && !defined(__WIN__)
#include <my_pthread.h>				/* because of signal()	*/
#endif
#ifndef INADDR_NONE
#define INADDR_NONE	-1
#endif

#include <sql_common.h>
#include "client_settings.h"

#undef net_buffer_length
#undef max_allowed_packet

ulong 		net_buffer_length=8192;
ulong		max_allowed_packet= 1024L*1024L*1024L;
ulong		net_read_timeout=  CLIENT_NET_READ_TIMEOUT;
ulong		net_write_timeout= CLIENT_NET_WRITE_TIMEOUT;


#ifdef EMBEDDED_LIBRARY
#undef net_flush
my_bool	net_flush(NET *net);
#endif

#if defined(MSDOS) || defined(__WIN__)
/* socket_errno is defined in my_global.h for all platforms */
#define perror(A)
#else
#include <errno.h>
#define SOCKET_ERROR -1
#endif /* __WIN__ */

/*
  If allowed through some configuration, then this needs to
  be changed
*/
#define MAX_LONG_DATA_LENGTH 8192
#define unsigned_field(A) ((A)->flags & UNSIGNED_FLAG)

static void append_wild(char *to,char *end,const char *wild);
sig_handler pipe_sig_handler(int sig);

static my_bool mysql_client_init= 0;
static my_bool org_my_init_done= 0;


/*
  Initialize the MySQL client library

  SYNOPSIS
    mysql_server_init()

  NOTES
    Should be called before doing any other calls to the MySQL
    client library to initialize thread specific variables etc.
    It's called by mysql_init() to ensure that things will work for
    old not threaded applications that doesn't call mysql_server_init()
    directly.

  RETURN
    0  ok
    1  could not initialize environment (out of memory or thread keys)
*/

int STDCALL mysql_server_init(int argc __attribute__((unused)),
			      char **argv __attribute__((unused)),
			      char **groups __attribute__((unused)))
{
  int result= 0;
  if (!mysql_client_init)
  {
    mysql_client_init=1;
    org_my_init_done=my_init_done;
    if (my_init())				/* Will init threads */
      return 1;
    init_client_errs();
    if (!mysql_port)
    {
      mysql_port = MYSQL_PORT;
#ifndef MSDOS
      {
	struct servent *serv_ptr;
	char	*env;
	if ((serv_ptr = getservbyname("mysql", "tcp")))
	  mysql_port = (uint) ntohs((ushort) serv_ptr->s_port);
	if ((env = getenv("MYSQL_TCP_PORT")))
	  mysql_port =(uint) atoi(env);
      }
#endif
    }
    if (!mysql_unix_port)
    {
      char *env;
#ifdef __WIN__
      mysql_unix_port = (char*) MYSQL_NAMEDPIPE;
#else
      mysql_unix_port = (char*) MYSQL_UNIX_ADDR;
#endif
      if ((env = getenv("MYSQL_UNIX_PORT")))
	mysql_unix_port = env;
    }
    mysql_debug(NullS);
#if defined(SIGPIPE) && !defined(__WIN__) && !defined(__NETWARE__)
    (void) signal(SIGPIPE, SIG_IGN);
#endif
#ifdef EMBEDDED_LIBRARY
    result= init_embedded_server(argc, argv, groups);
#endif
  }
#ifdef THREAD
  else
    result= (int)my_thread_init();         /* Init if new thread */
#endif
  return result;
}


void STDCALL mysql_server_end()
{
#ifdef EMBEDDED_LIBRARY
  end_embedded_server();
#endif
  /* If library called my_init(), free memory allocated by it */
  if (!org_my_init_done)
  {
    my_end(0);
#ifndef THREAD
  /* Remove TRACING, if enabled by mysql_debug() */
    DBUG_POP();
#endif
  }
  else
    mysql_thread_end();
  mysql_client_init= org_my_init_done= 0;
}

static MYSQL_PARAMETERS mysql_internal_parameters=
{&max_allowed_packet, &net_buffer_length};

MYSQL_PARAMETERS *STDCALL mysql_get_parameters(void)
{
  return &mysql_internal_parameters;
}

my_bool STDCALL mysql_thread_init()
{
#ifdef THREAD
  return my_thread_init();
#else
  return 0;
#endif
}

void STDCALL mysql_thread_end()
{
#ifdef THREAD
  my_thread_end();
#endif
}

/*
  Let the user specify that we don't want SIGPIPE;  This doesn't however work
  with threaded applications as we can have multiple read in progress.
*/
static MYSQL* spawn_init(MYSQL* parent, const char* host,
			 unsigned int port,
			 const char* user,
			 const char* passwd);



/*
  Expand wildcard to a sql string
*/

static void
append_wild(char *to, char *end, const char *wild)
{
  end-=5;					/* Some extra */
  if (wild && wild[0])
  {
    to=strmov(to," like '");
    while (*wild && to < end)
    {
      if (*wild == '\\' || *wild == '\'')
	*to++='\\';
      *to++= *wild++;
    }
    if (*wild)					/* Too small buffer */
      *to++='%';				/* Nicer this way */
    to[0]='\'';
    to[1]=0;
  }
}


/**************************************************************************
  Init debugging if MYSQL_DEBUG environment variable is found
**************************************************************************/

void STDCALL
mysql_debug(const char *debug __attribute__((unused)))
{
#ifndef DBUG_OFF
  char	*env;
  if (_db_on_)
    return;					/* Already using debugging */
  if (debug)
  {
    DEBUGGER_ON;
    DBUG_PUSH(debug);
  }
  else if ((env = getenv("MYSQL_DEBUG")))
  {
    DEBUGGER_ON;
    DBUG_PUSH(env);
#if !defined(_WINVER) && !defined(WINVER)
    puts("\n-------------------------------------------------------");
    puts("MYSQL_DEBUG found. libmysql started with the following:");
    puts(env);
    puts("-------------------------------------------------------\n");
#else
    {
      char buff[80];
      buff[sizeof(buff)-1]= 0;
      strxnmov(buff,sizeof(buff)-1,"libmysql: ", env, NullS);
      MessageBox((HWND) 0,"Debugging variable MYSQL_DEBUG used",buff,MB_OK);
    }
#endif
  }
#endif
}


/**************************************************************************
  Close the server connection if we get a SIGPIPE
   ARGSUSED
**************************************************************************/

sig_handler
pipe_sig_handler(int sig __attribute__((unused)))
{
  DBUG_PRINT("info",("Hit by signal %d",sig));
#ifdef DONT_REMEMBER_SIGNAL
  (void) signal(SIGPIPE,pipe_sig_handler);
#endif
}

/* perform query on master */
my_bool STDCALL mysql_master_query(MYSQL *mysql, const char *q,
				   unsigned long length)
{
  DBUG_ENTER("mysql_master_query");
  if (mysql_master_send_query(mysql, q, length))
    DBUG_RETURN(1);
  DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
}

my_bool STDCALL mysql_master_send_query(MYSQL *mysql, const char *q,
					unsigned long length)
{
  MYSQL *master = mysql->master;
  DBUG_ENTER("mysql_master_send_query");
  if (!master->net.vio && !mysql_real_connect(master,0,0,0,0,0,0,0))
    DBUG_RETURN(1);
  mysql->last_used_con = master;
  DBUG_RETURN(simple_command(master, COM_QUERY, q, length, 1));
}


/* perform query on slave */
my_bool STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
				  unsigned long length)
{
  DBUG_ENTER("mysql_slave_query");
  if (mysql_slave_send_query(mysql, q, length))
    DBUG_RETURN(1);
  DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
}


my_bool STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
				   unsigned long length)
{
  MYSQL* last_used_slave, *slave_to_use = 0;
  DBUG_ENTER("mysql_slave_send_query");

  if ((last_used_slave = mysql->last_used_slave))
    slave_to_use = last_used_slave->next_slave;
  else
    slave_to_use = mysql->next_slave;
  /*
    Next_slave is always safe to use - we have a circular list of slaves
    if there are no slaves, mysql->next_slave == mysql
  */
  mysql->last_used_con = mysql->last_used_slave = slave_to_use;
  if (!slave_to_use->net.vio && !mysql_real_connect(slave_to_use, 0,0,0,
						    0,0,0,0))
    DBUG_RETURN(1);
  DBUG_RETURN(simple_command(slave_to_use, COM_QUERY, q, length, 1));
}


/* enable/disable parsing of all queries to decide
   if they go on master or slave */
void STDCALL mysql_enable_rpl_parse(MYSQL* mysql)
{
  mysql->options.rpl_parse = 1;
}

void STDCALL mysql_disable_rpl_parse(MYSQL* mysql)
{
  mysql->options.rpl_parse = 0;
}

/* get the value of the parse flag */
int STDCALL mysql_rpl_parse_enabled(MYSQL* mysql)
{
  return mysql->options.rpl_parse;
}

/*  enable/disable reads from master */
void STDCALL mysql_enable_reads_from_master(MYSQL* mysql)
{
  mysql->options.no_master_reads = 0;
}

void STDCALL mysql_disable_reads_from_master(MYSQL* mysql)
{
  mysql->options.no_master_reads = 1;
}

/* get the value of the master read flag */
my_bool STDCALL mysql_reads_from_master_enabled(MYSQL* mysql)
{
  return !(mysql->options.no_master_reads);
}


/*
  We may get an error while doing replication internals.
  In this case, we add a special explanation to the original
  error
*/

static void expand_error(MYSQL* mysql, int error)
{
  char tmp[MYSQL_ERRMSG_SIZE];
  char *p;
  uint err_length;
  strmake(tmp, mysql->net.last_error, MYSQL_ERRMSG_SIZE-1);
  p = strmake(mysql->net.last_error, ER(error), MYSQL_ERRMSG_SIZE-1);
  err_length= (uint) (p - mysql->net.last_error);
  strmake(p, tmp, MYSQL_ERRMSG_SIZE-1 - err_length);
  mysql->net.last_errno = error;
}

/*
  This function assumes we have just called SHOW SLAVE STATUS and have
  read the given result and row
*/

static my_bool get_master(MYSQL* mysql, MYSQL_RES* res, MYSQL_ROW row)
{
  MYSQL* master;
  DBUG_ENTER("get_master");
  if (mysql_num_fields(res) < 3)
    DBUG_RETURN(1); /* safety */

  /* use the same username and password as the original connection */
  if (!(master = spawn_init(mysql, row[0], atoi(row[2]), 0, 0)))
    DBUG_RETURN(1);
  mysql->master = master;
  DBUG_RETURN(0);
}


/*
  Assuming we already know that mysql points to a master connection,
  retrieve all the slaves
*/

static my_bool get_slaves_from_master(MYSQL* mysql)
{
  MYSQL_RES* res = 0;
  MYSQL_ROW row;
  my_bool error = 1;
  int has_auth_info;
  int port_ind;
  DBUG_ENTER("get_slaves_from_master");

  if (!mysql->net.vio && !mysql_real_connect(mysql,0,0,0,0,0,0,0))
  {
    expand_error(mysql, CR_PROBE_MASTER_CONNECT);
    DBUG_RETURN(1);
  }

  if (mysql_query(mysql, "SHOW SLAVE HOSTS") ||
      !(res = mysql_store_result(mysql)))
  {
    expand_error(mysql, CR_PROBE_SLAVE_HOSTS);
    DBUG_RETURN(1);
  }

  switch (mysql_num_fields(res)) {
  case 5:
    has_auth_info = 0;
    port_ind=2;
    break;
  case 7:
    has_auth_info = 1;
    port_ind=4;
    break;
  default:
    goto err;
  }

  while ((row = mysql_fetch_row(res)))
  {
    MYSQL* slave;
    const char* tmp_user, *tmp_pass;

    if (has_auth_info)
    {
      tmp_user = row[2];
      tmp_pass = row[3];
    }
    else
    {
      tmp_user = mysql->user;
      tmp_pass = mysql->passwd;
    }

    if (!(slave = spawn_init(mysql, row[1], atoi(row[port_ind]),
			     tmp_user, tmp_pass)))
      goto err;

    /* Now add slave into the circular linked list */
    slave->next_slave = mysql->next_slave;
    mysql->next_slave = slave;
  }
  error = 0;
err:
  if (res)
    mysql_free_result(res);
  DBUG_RETURN(error);
}


my_bool STDCALL mysql_rpl_probe(MYSQL* mysql)
{
  MYSQL_RES *res= 0;
  MYSQL_ROW row;
  my_bool error= 1;
  DBUG_ENTER("mysql_rpl_probe");

  /*
    First determine the replication role of the server we connected to
    the most reliable way to do this is to run SHOW SLAVE STATUS and see
    if we have a non-empty master host. This is still not fool-proof -
    it is not a sin to have a master that has a dormant slave thread with
    a non-empty master host. However, it is more reliable to check
    for empty master than whether the slave thread is actually running
  */
  if (mysql_query(mysql, "SHOW SLAVE STATUS") ||
      !(res = mysql_store_result(mysql)))
  {
    expand_error(mysql, CR_PROBE_SLAVE_STATUS);
    DBUG_RETURN(1);
  }

  row= mysql_fetch_row(res);
  /*
    Check master host for emptiness/NULL
    For MySQL 4.0 it's enough to check for row[0]
  */
  if (row && row[0] && *(row[0]))
  {
    /* this is a slave, ask it for the master */
    if (get_master(mysql, res, row) || get_slaves_from_master(mysql))
      goto err;
  }
  else
  {
    mysql->master = mysql;
    if (get_slaves_from_master(mysql))
      goto err;
  }

  error = 0;
err:
  if (res)
    mysql_free_result(res);
  DBUG_RETURN(error);
}


/*
  Make a not so fool-proof decision on where the query should go, to
  the master or the slave. Ideally the user should always make this
  decision himself with mysql_master_query() or mysql_slave_query().
  However, to be able to more easily port the old code, we support the
  option of an educated guess - this should work for most applications,
  however, it may make the wrong decision in some particular cases. If
  that happens, the user would have to change the code to call
  mysql_master_query() or mysql_slave_query() explicitly in the place
  where we have made the wrong decision
*/

enum mysql_rpl_type
STDCALL mysql_rpl_query_type(const char* q, int len)
{
  const char *q_end= q + len;
  for (; q < q_end; ++q)
  {
    char c;
    if (my_isalpha(&my_charset_latin1, (c= *q)))
    {
      switch (my_tolower(&my_charset_latin1,c)) {
      case 'i':  /* insert */
      case 'u':  /* update or unlock tables */
      case 'l':  /* lock tables or load data infile */
      case 'd':  /* drop or delete */
      case 'a':  /* alter */
	return MYSQL_RPL_MASTER;
      case 'c':  /* create or check */
	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
	  MYSQL_RPL_MASTER;
      case 's': /* select or show */
	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
	  MYSQL_RPL_SLAVE;
      case 'f': /* flush */
      case 'r': /* repair */
      case 'g': /* grant */
	return MYSQL_RPL_ADMIN;
      default:
	return MYSQL_RPL_SLAVE;
      }
    }
  }
  return MYSQL_RPL_MASTER;		/* By default, send to master */
}


/**************************************************************************
  Connect to sql server
  If host == 0 then use localhost
**************************************************************************/

#ifdef USE_OLD_FUNCTIONS
MYSQL * STDCALL
mysql_connect(MYSQL *mysql,const char *host,
	      const char *user, const char *passwd)
{
  MYSQL *res;
  mysql=mysql_init(mysql);			/* Make it thread safe */
  {
    DBUG_ENTER("mysql_connect");
    if (!(res=mysql_real_connect(mysql,host,user,passwd,NullS,0,NullS,0)))
    {
      if (mysql->free_me)
	my_free((gptr) mysql,MYF(0));
    }
    DBUG_RETURN(res);
  }
}
#endif


/**************************************************************************
  Change user and database
**************************************************************************/

int cli_read_change_user_result(MYSQL *mysql, char *buff, const char *passwd)
{
  NET *net= &mysql->net;
  ulong pkt_length;

  pkt_length= net_safe_read(mysql);
  
  if (pkt_length == packet_error)
    return 1;

  if (pkt_length == 1 && net->read_pos[0] == 254 &&
      mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
  {
    /*
      By sending this very specific reply server asks us to send scrambled
      password in old format. The reply contains scramble_323.
    */
    scramble_323(buff, mysql->scramble, passwd);
    if (my_net_write(net, buff, SCRAMBLE_LENGTH_323 + 1) || net_flush(net))
    {
      net->last_errno= CR_SERVER_LOST;
      strmov(net->sqlstate, unknown_sqlstate);
      strmov(net->last_error,ER(net->last_errno));
      return 1;
    }
    /* Read what server thinks about out new auth message report */
    if (net_safe_read(mysql) == packet_error)
      return 1;
  }
  return 0;
}


my_bool	STDCALL mysql_change_user(MYSQL *mysql, const char *user,
				  const char *passwd, const char *db)
{
  char buff[512],*end=buff;
  int rc;
  DBUG_ENTER("mysql_change_user");

  if (!user)
    user="";
  if (!passwd)
    passwd="";

  /* Store user into the buffer */
  end=strmov(end,user)+1;

  /* write scrambled password according to server capabilities */
  if (passwd[0])
  {
    if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
    {
      *end++= SCRAMBLE_LENGTH;
      scramble(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH;
    }
    else
    {
      scramble_323(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH_323 + 1;
    }
  }
  else
    *end++= '\0';                               /* empty password */
  /* Add database if needed */
  end= strmov(end, db ? db : "") + 1;

  /* Write authentication package */
  simple_command(mysql,COM_CHANGE_USER, buff,(ulong) (end-buff),1);

  rc= (*mysql->methods->read_change_user_result)(mysql, buff, passwd);

  /*
    The server will close all statements no matter was the attempt
    to change user successful or not.
  */
  mysql_detach_stmt_list(&mysql->stmts);
  if (rc == 0)
  {
    /* Free old connect information */
    my_free(mysql->user,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->passwd,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->db,MYF(MY_ALLOW_ZERO_PTR));

    /* alloc new connect information */
    mysql->user=  my_strdup(user,MYF(MY_WME));
    mysql->passwd=my_strdup(passwd,MYF(MY_WME));
    mysql->db=    db ? my_strdup(db,MYF(MY_WME)) : 0;
  }
  DBUG_RETURN(rc);
}

#if defined(HAVE_GETPWUID) && defined(NO_GETPWUID_DECL)
struct passwd *getpwuid(uid_t);
char* getlogin(void);
#endif

#if defined(__NETWARE__)
/* Default to value of USER on NetWare, if unset use "UNKNOWN_USER" */
void read_user_name(char *name)
{
  char *str=getenv("USER");
  strmake(name, str ? str : "UNKNOWN_USER", USERNAME_LENGTH);
}

#elif !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__) && !defined(OS2)

void read_user_name(char *name)
{
  DBUG_ENTER("read_user_name");
  if (geteuid() == 0)
    (void) strmov(name,"root");		/* allow use of surun */
  else
  {
#ifdef HAVE_GETPWUID
    struct passwd *skr;
    const char *str;
    if ((str=getlogin()) == NULL)
    {
      if ((skr=getpwuid(geteuid())) != NULL)
	str=skr->pw_name;
      else if (!(str=getenv("USER")) && !(str=getenv("LOGNAME")) &&
	       !(str=getenv("LOGIN")))
	str="UNKNOWN_USER";
    }
    (void) strmake(name,str,USERNAME_LENGTH);
#elif HAVE_CUSERID
    (void) cuserid(name);
#else
    strmov(name,"UNKNOWN_USER");
#endif
  }
  DBUG_VOID_RETURN;
}

#else /* If MSDOS || VMS */

void read_user_name(char *name)
{
  char *str=getenv("USER");		/* ODBC will send user variable */
  strmake(name,str ? str : "ODBC", USERNAME_LENGTH);
}

#endif

my_bool handle_local_infile(MYSQL *mysql, const char *net_filename)
{
  my_bool result= 1;
  uint packet_length=MY_ALIGN(mysql->net.max_packet-16,IO_SIZE);
  NET *net= &mysql->net;
  int readcount;
  void *li_ptr;          /* pass state to local_infile functions */
  char *buf;		/* buffer to be filled by local_infile_read */
  struct st_mysql_options *options= &mysql->options;
  DBUG_ENTER("handle_local_infile");

  /* check that we've got valid callback functions */
  if (!(options->local_infile_init &&
	options->local_infile_read &&
	options->local_infile_end &&
	options->local_infile_error))
  {
    /* if any of the functions is invalid, set the default */
    mysql_set_local_infile_default(mysql);
  }

  /* copy filename into local memory and allocate read buffer */
  if (!(buf=my_malloc(packet_length, MYF(0))))
  {
    strmov(net->sqlstate, unknown_sqlstate);
    strmov(net->last_error, ER(net->last_errno=CR_OUT_OF_MEMORY));
    DBUG_RETURN(1);
  }

  /* initialize local infile (open file, usually) */
  if ((*options->local_infile_init)(&li_ptr, net_filename,
    options->local_infile_userdata))
  {
    my_net_write(net,"",0);		/* Server needs one packet */
    net_flush(net);
    strmov(net->sqlstate, unknown_sqlstate);
    net->last_errno= (*options->local_infile_error)(li_ptr,
						    net->last_error,
						    sizeof(net->last_error)-1);
    goto err;
  }

  /* read blocks of data from local infile callback */
  while ((readcount =
	  (*options->local_infile_read)(li_ptr, buf,
					packet_length)) > 0)
  {
    if (my_net_write(net,buf,readcount))
    {
      DBUG_PRINT("error",
		 ("Lost connection to MySQL server during LOAD DATA of local file"));
      strmov(net->sqlstate, unknown_sqlstate);
      net->last_errno=CR_SERVER_LOST;
      strmov(net->last_error,ER(net->last_errno));
      goto err;
    }
  }

  /* Send empty packet to mark end of file */
  if (my_net_write(net,"",0) || net_flush(net))
  {
    strmov(net->sqlstate, unknown_sqlstate);
    net->last_errno=CR_SERVER_LOST;
    sprintf(net->last_error,ER(net->last_errno),errno);
    goto err;
  }

  if (readcount < 0)
  {
    net->last_errno= (*options->local_infile_error)(li_ptr,
						    net->last_error,
						    sizeof(net->last_error)-1);
    goto err;
  }

  result=0;					/* Ok */

err:
  /* free up memory allocated with _init, usually */
  (*options->local_infile_end)(li_ptr);
  DBUG_RETURN(result);
}


/****************************************************************************
  Default handlers for LOAD LOCAL INFILE
****************************************************************************/

typedef struct st_default_local_infile
{
  int fd;
  int error_num;
  const char *filename;
  char error_msg[LOCAL_INFILE_ERROR_LEN];
} default_local_infile_data;


/*
  Open file for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_init()
    ptr			Store pointer to internal data here
    filename		File name to open. This may be in unix format !


  NOTES
    Even if this function returns an error, the load data interface
    guarantees that default_local_infile_end() is called.

  RETURN
    0	ok
    1	error
*/

static int default_local_infile_init(void **ptr, const char *filename,
             void *userdata __attribute__ ((unused)))
{
  default_local_infile_data *data;
  char tmp_name[FN_REFLEN];

  if (!(*ptr= data= ((default_local_infile_data *)
		     my_malloc(sizeof(default_local_infile_data),  MYF(0)))))
    return 1; /* out of memory */

  data->error_msg[0]= 0;
  data->error_num=    0;
  data->filename= filename;

  fn_format(tmp_name, filename, "", "", MY_UNPACK_FILENAME);
  if ((data->fd = my_open(tmp_name, O_RDONLY, MYF(0))) < 0)
  {
    data->error_num= my_errno;
    my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
                EE(EE_FILENOTFOUND), tmp_name, data->error_num);
    return 1;
  }
  return 0; /* ok */
}


/*
  Read data for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_read()
    ptr			Points to handle allocated by _init
    buf			Read data here
    buf_len		Ammount of data to read

  RETURN
    > 0		number of bytes read
    == 0	End of data
    < 0		Error
*/

static int default_local_infile_read(void *ptr, char *buf, uint buf_len)
{
  int count;
  default_local_infile_data*data = (default_local_infile_data *) ptr;

  if ((count= (int) my_read(data->fd, (byte *) buf, buf_len, MYF(0))) < 0)
  {
    data->error_num= EE_READ; /* the errmsg for not entire file read */
    my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
		EE(EE_READ),
		data->filename, my_errno);
  }
  return count;
}


/*
  Read data for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_end()
    ptr			Points to handle allocated by _init
			May be NULL if _init failed!

  RETURN
*/

static void default_local_infile_end(void *ptr)
{
  default_local_infile_data *data= (default_local_infile_data *) ptr;
  if (data)					/* If not error on open */
  {
    if (data->fd >= 0)
      my_close(data->fd, MYF(MY_WME));
    my_free(ptr, MYF(MY_WME));
  }
}


/*
  Return error from LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_end()
    ptr			Points to handle allocated by _init
			May be NULL if _init failed!
    error_msg		Store error text here
    error_msg_len	Max lenght of error_msg

  RETURN
    error message number
*/

static int
default_local_infile_error(void *ptr, char *error_msg, uint error_msg_len)
{
  default_local_infile_data *data = (default_local_infile_data *) ptr;
  if (data)					/* If not error on open */
  {
    strmake(error_msg, data->error_msg, error_msg_len);
    return data->error_num;
  }
  /* This can only happen if we got error on malloc of handle */
  strmov(error_msg, ER(CR_OUT_OF_MEMORY));
  return CR_OUT_OF_MEMORY;
}


void
mysql_set_local_infile_handler(MYSQL *mysql,
                               int (*local_infile_init)(void **, const char *,
                               void *),
                               int (*local_infile_read)(void *, char *, uint),
                               void (*local_infile_end)(void *),
                               int (*local_infile_error)(void *, char *, uint),
                               void *userdata)
{
  mysql->options.local_infile_init=  local_infile_init;
  mysql->options.local_infile_read=  local_infile_read;
  mysql->options.local_infile_end=   local_infile_end;
  mysql->options.local_infile_error= local_infile_error;
  mysql->options.local_infile_userdata = userdata;
}


void mysql_set_local_infile_default(MYSQL *mysql)
{
  mysql->options.local_infile_init=  default_local_infile_init;
  mysql->options.local_infile_read=  default_local_infile_read;
  mysql->options.local_infile_end=   default_local_infile_end;
  mysql->options.local_infile_error= default_local_infile_error;
}


/**************************************************************************
  Do a query. If query returned rows, free old rows.
  Read data by mysql_store_result or by repeat call of mysql_fetch_row
**************************************************************************/

int STDCALL
mysql_query(MYSQL *mysql, const char *query)
{
  return mysql_real_query(mysql,query, (uint) strlen(query));
}


static MYSQL* spawn_init(MYSQL* parent, const char* host,
			 unsigned int port, const char* user,
			 const char* passwd)
{
  MYSQL* child;
  DBUG_ENTER("spawn_init");
  if (!(child= mysql_init(0)))
    DBUG_RETURN(0);

  child->options.user= my_strdup((user) ? user :
				 (parent->user ? parent->user :
				  parent->options.user), MYF(0));
  child->options.password= my_strdup((passwd) ? passwd :
				     (parent->passwd ?
				      parent->passwd :
				      parent->options.password), MYF(0));
  child->options.port= port;
  child->options.host= my_strdup((host) ? host :
				 (parent->host ?
				  parent->host :
				  parent->options.host), MYF(0));
  if (parent->db)
    child->options.db= my_strdup(parent->db, MYF(0));
  else if (parent->options.db)
    child->options.db= my_strdup(parent->options.db, MYF(0));

  /*
    rpl_pivot is set to 1 in mysql_init();  Reset it as we are not doing
    replication here
  */
  child->rpl_pivot= 0;
  DBUG_RETURN(child);
}


int
STDCALL mysql_set_master(MYSQL* mysql, const char* host,
			 unsigned int port, const char* user,
			 const char* passwd)
{
  if (mysql->master != mysql && !mysql->master->rpl_pivot)
    mysql_close(mysql->master);
  if (!(mysql->master = spawn_init(mysql, host, port, user, passwd)))
    return 1;
  return 0;
}


int
STDCALL mysql_add_slave(MYSQL* mysql, const char* host,
			unsigned int port,
			const char* user,
			const char* passwd)
{
  MYSQL* slave;
  if (!(slave = spawn_init(mysql, host, port, user, passwd)))
    return 1;
  slave->next_slave = mysql->next_slave;
  mysql->next_slave = slave;
  return 0;
}

/**************************************************************************
  Return next field of the query results
**************************************************************************/

MYSQL_FIELD * STDCALL
mysql_fetch_field(MYSQL_RES *result)
{
  if (result->current_field >= result->field_count)
    return(NULL);
  return &result->fields[result->current_field++];
}


/**************************************************************************
  Get column lengths of the current row
  If one uses mysql_use_result, res->lengths contains the length information,
  else the lengths are calculated from the offset between pointers.
**************************************************************************/

ulong * STDCALL
mysql_fetch_lengths(MYSQL_RES *res)
{
  MYSQL_ROW column;

  if (!(column=res->current_row))
    return 0;					/* Something is wrong */
  if (res->data)
    (*res->methods->fetch_lengths)(res->lengths, column, res->field_count);
  return res->lengths;
}


/**************************************************************************
  Move to a specific row and column
**************************************************************************/

void STDCALL
mysql_data_seek(MYSQL_RES *result, my_ulonglong row)
{
  MYSQL_ROWS	*tmp=0;
  DBUG_PRINT("info",("mysql_data_seek(%ld)",(long) row));
  if (result->data)
    for (tmp=result->data->data; row-- && tmp ; tmp = tmp->next) ;
  result->current_row=0;
  result->data_cursor = tmp;
}


/*************************************************************************
  put the row or field cursor one a position one got from mysql_row_tell()
  This doesn't restore any data. The next mysql_fetch_row or
  mysql_fetch_field will return the next row or field after the last used
*************************************************************************/

MYSQL_ROW_OFFSET STDCALL
mysql_row_seek(MYSQL_RES *result, MYSQL_ROW_OFFSET row)
{
  MYSQL_ROW_OFFSET return_value=result->data_cursor;
  result->current_row= 0;
  result->data_cursor= row;
  return return_value;
}


MYSQL_FIELD_OFFSET STDCALL
mysql_field_seek(MYSQL_RES *result, MYSQL_FIELD_OFFSET field_offset)
{
  MYSQL_FIELD_OFFSET return_value=result->current_field;
  result->current_field=field_offset;
  return return_value;
}


/*****************************************************************************
  List all databases
*****************************************************************************/

MYSQL_RES * STDCALL
mysql_list_dbs(MYSQL *mysql, const char *wild)
{
  char buff[255];
  DBUG_ENTER("mysql_list_dbs");

  append_wild(strmov(buff,"show databases"),buff+sizeof(buff),wild);
  if (mysql_query(mysql,buff))
    DBUG_RETURN(0);
  DBUG_RETURN (mysql_store_result(mysql));
}


/*****************************************************************************
  List all tables in a database
  If wild is given then only the tables matching wild is returned
*****************************************************************************/

MYSQL_RES * STDCALL
mysql_list_tables(MYSQL *mysql, const char *wild)
{
  char buff[255];
  DBUG_ENTER("mysql_list_tables");

  append_wild(strmov(buff,"show tables"),buff+sizeof(buff),wild);
  if (mysql_query(mysql,buff))
    DBUG_RETURN(0);
  DBUG_RETURN (mysql_store_result(mysql));
}


MYSQL_FIELD *cli_list_fields(MYSQL *mysql)
{
  MYSQL_DATA *query;
  if (!(query= cli_read_rows(mysql,(MYSQL_FIELD*) 0, 
			     protocol_41(mysql) ? 8 : 6)))
    return NULL;

  mysql->field_count= (uint) query->rows;
  return unpack_fields(query,&mysql->field_alloc,
		       mysql->field_count, 1, mysql->server_capabilities);
}


/**************************************************************************
  List all fields in a table
  If wild is given then only the fields matching wild is returned
  Instead of this use query:
  show fields in 'table' like "wild"
**************************************************************************/

MYSQL_RES * STDCALL
mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)
{
  MYSQL_RES   *result;
  MYSQL_FIELD *fields;
  char	     buff[257],*end;
  DBUG_ENTER("mysql_list_fields");
  DBUG_PRINT("enter",("table: '%s'  wild: '%s'",table,wild ? wild : ""));

  end=strmake(strmake(buff, table,128)+1,wild ? wild : "",128);
  free_old_query(mysql);
  if (simple_command(mysql,COM_FIELD_LIST,buff,(ulong) (end-buff),1) ||
      !(fields= (*mysql->methods->list_fields)(mysql)))
    DBUG_RETURN(NULL);

  if (!(result = (MYSQL_RES *) my_malloc(sizeof(MYSQL_RES),
					 MYF(MY_WME | MY_ZEROFILL))))
    DBUG_RETURN(NULL);

  result->methods= mysql->methods;
  result->field_alloc=mysql->field_alloc;
  mysql->fields=0;
  result->field_count = mysql->field_count;
  result->fields= fields;
  result->eof=1;
  DBUG_RETURN(result);
}

/* List all running processes (threads) in server */

MYSQL_RES * STDCALL
mysql_list_processes(MYSQL *mysql)
{
  MYSQL_DATA *fields;
  uint field_count;
  uchar *pos;
  DBUG_ENTER("mysql_list_processes");

  LINT_INIT(fields);
  if (simple_command(mysql,COM_PROCESS_INFO,0,0,0))
    DBUG_RETURN(0);
  free_old_query(mysql);
  pos=(uchar*) mysql->net.read_pos;
  field_count=(uint) net_field_length(&pos);
  if (!(fields = (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*) 0,
					      protocol_41(mysql) ? 7 : 5)))
    DBUG_RETURN(NULL);
  if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,field_count,0,
				    mysql->server_capabilities)))
    DBUG_RETURN(0);
  mysql->status=MYSQL_STATUS_GET_RESULT;
  mysql->field_count=field_count;
  DBUG_RETURN(mysql_store_result(mysql));
}


#ifdef USE_OLD_FUNCTIONS
int  STDCALL
mysql_create_db(MYSQL *mysql, const char *db)
{
  DBUG_ENTER("mysql_createdb");
  DBUG_PRINT("enter",("db: %s",db));
  DBUG_RETURN(simple_command(mysql,COM_CREATE_DB,db, (ulong) strlen(db),0));
}


int  STDCALL
mysql_drop_db(MYSQL *mysql, const char *db)
{
  DBUG_ENTER("mysql_drop_db");
  DBUG_PRINT("enter",("db: %s",db));
  DBUG_RETURN(simple_command(mysql,COM_DROP_DB,db,(ulong) strlen(db),0));
}
#endif


int STDCALL
mysql_shutdown(MYSQL *mysql, enum mysql_enum_shutdown_level shutdown_level)
{
  uchar level[1];
  DBUG_ENTER("mysql_shutdown");
  level[0]= (uchar) shutdown_level;
  DBUG_RETURN(simple_command(mysql, COM_SHUTDOWN, (char *)level, 1, 0));
}


int STDCALL
mysql_refresh(MYSQL *mysql,uint options)
{
  uchar bits[1];
  DBUG_ENTER("mysql_refresh");
  bits[0]= (uchar) options;
  DBUG_RETURN(simple_command(mysql,COM_REFRESH,(char*) bits,1,0));
}


int STDCALL
mysql_kill(MYSQL *mysql,ulong pid)
{
  char buff[4];
  DBUG_ENTER("mysql_kill");
  int4store(buff,pid);
  DBUG_RETURN(simple_command(mysql,COM_PROCESS_KILL,buff,sizeof(buff),0));
}


int STDCALL
mysql_set_server_option(MYSQL *mysql, enum enum_mysql_set_option option)
{
  char buff[2];
  DBUG_ENTER("mysql_set_server_option");
  int2store(buff, (uint) option);
  DBUG_RETURN(simple_command(mysql, COM_SET_OPTION, buff, sizeof(buff), 0));
}


int STDCALL
mysql_dump_debug_info(MYSQL *mysql)
{
  DBUG_ENTER("mysql_dump_debug_info");
  DBUG_RETURN(simple_command(mysql,COM_DEBUG,0,0,0));
}


const char *cli_read_statistics(MYSQL *mysql)
{
  mysql->net.read_pos[mysql->packet_length]=0;	/* End of stat string */
  if (!mysql->net.read_pos[0])
  {
    strmov(mysql->net.sqlstate, unknown_sqlstate);
    mysql->net.last_errno=CR_WRONG_HOST_INFO;
    strmov(mysql->net.last_error, ER(mysql->net.last_errno));
    return mysql->net.last_error;
  }
  return (char*) mysql->net.read_pos;
}


const char * STDCALL
mysql_stat(MYSQL *mysql)
{
  DBUG_ENTER("mysql_stat");
  if (simple_command(mysql,COM_STATISTICS,0,0,0))
    return mysql->net.last_error;
  DBUG_RETURN((*mysql->methods->read_statistics)(mysql));
}


int STDCALL
mysql_ping(MYSQL *mysql)
{
  DBUG_ENTER("mysql_ping");
  DBUG_RETURN(simple_command(mysql,COM_PING,0,0,0));
}


const char * STDCALL
mysql_get_server_info(MYSQL *mysql)
{
  return((char*) mysql->server_version);
}


/*
  Get version number for server in a form easy to test on

  SYNOPSIS
    mysql_get_server_version()
    mysql		Connection

  EXAMPLE
    4.1.0-alfa ->  40100
  
  NOTES
    We will ensure that a newer server always has a bigger number.

  RETURN
   Signed number > 323000
*/

ulong STDCALL
mysql_get_server_version(MYSQL *mysql)
{
  uint major, minor, version;
  char *pos= mysql->server_version, *end_pos;
  major=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
  minor=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
  version= (uint) strtoul(pos, &end_pos, 10);
  return (ulong) major*10000L+(ulong) (minor*100+version);
}


const char * STDCALL
mysql_get_host_info(MYSQL *mysql)
{
  return(mysql->host_info);
}


uint STDCALL
mysql_get_proto_info(MYSQL *mysql)
{
  return (mysql->protocol_version);
}

const char * STDCALL
mysql_get_client_info(void)
{
  return (char*) MYSQL_SERVER_VERSION;
}

ulong STDCALL mysql_get_client_version(void)
{
  return MYSQL_VERSION_ID;
}

my_bool STDCALL mysql_eof(MYSQL_RES *res)
{
  return res->eof;
}

MYSQL_FIELD * STDCALL mysql_fetch_field_direct(MYSQL_RES *res,uint fieldnr)
{
  return &(res)->fields[fieldnr];
}

MYSQL_FIELD * STDCALL mysql_fetch_fields(MYSQL_RES *res)
{
  return (res)->fields;
}

MYSQL_ROW_OFFSET STDCALL mysql_row_tell(MYSQL_RES *res)
{
  return res->data_cursor;
}

MYSQL_FIELD_OFFSET STDCALL mysql_field_tell(MYSQL_RES *res)
{
  return (res)->current_field;
}

/* MYSQL */

unsigned int STDCALL mysql_field_count(MYSQL *mysql)
{
  return mysql->last_used_con->field_count;
}

my_ulonglong STDCALL mysql_affected_rows(MYSQL *mysql)
{
  return mysql->last_used_con->affected_rows;
}

my_ulonglong STDCALL mysql_insert_id(MYSQL *mysql)
{
  return mysql->last_used_con->insert_id;
}

const char *STDCALL mysql_sqlstate(MYSQL *mysql)
{
  return mysql->net.sqlstate;
}

uint STDCALL mysql_warning_count(MYSQL *mysql)
{
  return mysql->warning_count;
}

const char *STDCALL mysql_info(MYSQL *mysql)
{
  return mysql->info;
}

ulong STDCALL mysql_thread_id(MYSQL *mysql)
{
  return (mysql)->thread_id;
}

const char * STDCALL mysql_character_set_name(MYSQL *mysql)
{
  return mysql->charset->name;
}


uint STDCALL mysql_thread_safe(void)
{
#ifdef THREAD
  return 1;
#else
  return 0;
#endif
}


my_bool STDCALL mysql_embedded(void)
{
#ifdef EMBEDDED_LIBRARY
  return 1;
#else
  return 0;
#endif
}

/****************************************************************************
  Some support functions
****************************************************************************/

/*
  Functions called my my_net_init() to set some application specific variables
*/

void my_net_local_init(NET *net)
{
  net->max_packet=   (uint) net_buffer_length;
  net->read_timeout= (uint) net_read_timeout;
  net->write_timeout=(uint) net_write_timeout;
  net->retry_count=  1;
  net->max_packet_size= max(net_buffer_length, max_allowed_packet);
}

/*
  This function is used to create HEX string that you
  can use in a SQL statement in of the either ways:
    INSERT INTO blob_column VALUES (0xAABBCC);  (any MySQL version)
    INSERT INTO blob_column VALUES (X'AABBCC'); (4.1 and higher)
  
  The string in "from" is encoded to a HEX string.
  The result is placed in "to" and a terminating null byte is appended.
  
  The string pointed to by "from" must be "length" bytes long.
  You must allocate the "to" buffer to be at least length*2+1 bytes long.
  Each character needs two bytes, and you need room for the terminating
  null byte. When mysql_hex_string() returns, the contents of "to" will
  be a null-terminated string. The return value is the length of the
  encoded string, not including the terminating null character.

  The return value does not contain any leading 0x or a leading X' and
  trailing '. The caller must supply whichever of those is desired.
*/

ulong STDCALL
mysql_hex_string(char *to, const char *from, ulong length)
{
  char *to0= to;
  const char *end;
            
  for (end= from + length; from < end; from++)
  {
    *to++= _dig_vec_upper[((unsigned char) *from) >> 4];
    *to++= _dig_vec_upper[((unsigned char) *from) & 0x0F];
  }
  *to= '\0';
  return (ulong) (to-to0);
}

/*
  Add escape characters to a string (blob?) to make it suitable for a insert
  to should at least have place for length*2+1 chars
  Returns the length of the to string
*/

ulong STDCALL
mysql_escape_string(char *to,const char *from,ulong length)
{
  return escape_string_for_mysql(default_charset_info, to, from, length);
}

ulong STDCALL
mysql_real_escape_string(MYSQL *mysql, char *to,const char *from,
			 ulong length)
{
  return escape_string_for_mysql(mysql->charset, to, from, length);
}


char * STDCALL
mysql_odbc_escape_string(MYSQL *mysql,
			 char *to, ulong to_length,
			 const char *from, ulong from_length,
			 void *param,
			 char * (*extend_buffer)
			 (void *, char *, ulong *))
{
  char *to_end=to+to_length-5;
  const char *end;
#ifdef USE_MB
  my_bool use_mb_flag=use_mb(mysql->charset);
#endif

  for (end=from+from_length; from != end ; from++)
  {
    if (to >= to_end)
    {
      to_length = (ulong) (end-from)+512;	/* We want this much more */
      if (!(to=(*extend_buffer)(param, to, &to_length)))
	return to;
      to_end=to+to_length-5;
    }
#ifdef USE_MB
    {
      int l;
      if (use_mb_flag && (l = my_ismbchar(mysql->charset, from, end)))
      {
	while (l--)
	  *to++ = *from++;
	from--;
	continue;
      }
    }
#endif
    switch (*from) {
    case 0:				/* Must be escaped for 'mysql' */
      *to++= '\\';
      *to++= '0';
      break;
    case '\n':				/* Must be escaped for logs */
      *to++= '\\';
      *to++= 'n';
      break;
    case '\r':
      *to++= '\\';
      *to++= 'r';
      break;
    case '\\':
      *to++= '\\';
      *to++= '\\';
      break;
    case '\'':
      *to++= '\\';
      *to++= '\'';
      break;
    case '"':				/* Better safe than sorry */
      *to++= '\\';
      *to++= '"';
      break;
    case '\032':			/* This gives problems on Win32 */
      *to++= '\\';
      *to++= 'Z';
      break;
    default:
      *to++= *from;
    }
  }
  return to;
}

void STDCALL
myodbc_remove_escape(MYSQL *mysql,char *name)
{
  char *to;
#ifdef USE_MB
  my_bool use_mb_flag=use_mb(mysql->charset);
  char *end;
  LINT_INIT(end);
  if (use_mb_flag)
    for (end=name; *end ; end++) ;
#endif

  for (to=name ; *name ; name++)
  {
#ifdef USE_MB
    int l;
    if (use_mb_flag && (l = my_ismbchar( mysql->charset, name , end ) ) )
    {
      while (l--)
	*to++ = *name++;
      name--;
      continue;
    }
#endif
    if (*name == '\\' && name[1])
      name++;
    *to++= *name;
  }
  *to=0;
}

/********************************************************************
 Implementation of new client API for 4.1 version.

 mysql_stmt_* are real prototypes used by applications.

 To make API work in embedded library all functions performing
 real I/O are prefixed with 'cli_' (abbreviated from 'Call Level
 Interface'). This functions are invoked via pointers set in
 MYSQL::methods structure. Embedded counterparts, prefixed with
 'emb_' reside in libmysqld/lib_sql.cc.
*********************************************************************/

/******************* Declarations ***********************************/


/*
  These functions are called by function pointer MYSQL_STMT::read_row_func.
  Each function corresponds to one of the read methods:
  - mysql_stmt_fetch without prior mysql_stmt_store_result,
  - mysql_stmt_fetch when result is stored,
  - mysql_stmt_fetch when there are no rows (always returns MYSQL_NO_DATA)
*/

static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_no_data(MYSQL_STMT *stmt, unsigned char **row);

/*
  This function is used in mysql_stmt_store_result if
  STMT_ATTR_UPDATE_MAX_LENGTH attribute is set.
*/
static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data);

/*
  Maximum sizes of MYSQL_TYPE_DATE, MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME
  values stored in network buffer.
*/

/* 1 (length) + 2 (year) + 1 (month) + 1 (day) */
#define MAX_DATE_REP_LENGTH 5

/*
  1 (length) + 1 (is negative) + 4 (day count) + 1 (hour)
  + 1 (minute) + 1 (seconds) + 4 (microseconds)
*/
#define MAX_TIME_REP_LENGTH 13

/*
  1 (length) + 2 (year) + 1 (month) + 1 (day) +
  1 (hour) + 1 (minute) + 1 (second) + 4 (microseconds)
*/
#define MAX_DATETIME_REP_LENGTH 12

#define MAX_DOUBLE_STRING_REP_LENGTH 331

/**************** Misc utility functions ****************************/

/*
  Reallocate the NET package to have at least length bytes available.

  SYNPOSIS
    my_realloc_str()
    net                 The NET structure to modify.
    length              Ensure that net->buff has space for at least
                        this number of bytes.

  RETURN VALUES
    0   Success.
    1   Error, i.e. out of memory or requested packet size is bigger
        than max_allowed_packet. The error code is stored in net->last_errno.
*/

static my_bool my_realloc_str(NET *net, ulong length)
{
  ulong buf_length= (ulong) (net->write_pos - net->buff);
  my_bool res=0;
  DBUG_ENTER("my_realloc_str");
  if (buf_length + length > net->max_packet)
  {
    res= net_realloc(net, buf_length + length);
    net->write_pos= net->buff+ buf_length;
  }
  DBUG_RETURN(res);
}


/*
  Set statement error code, sqlstate, and error message
  from given errcode and sqlstate.
*/

static void set_stmt_error(MYSQL_STMT * stmt, int errcode,
                           const char *sqlstate)
{
  DBUG_ENTER("set_stmt_error");
  DBUG_PRINT("enter", ("error: %d '%s'", errcode, ER(errcode)));
  DBUG_ASSERT(stmt != 0);

  stmt->last_errno= errcode;
  strmov(stmt->last_error, ER(errcode));
  strmov(stmt->sqlstate, sqlstate);

  DBUG_VOID_RETURN;
}


/*
  Set statement error code, sqlstate, and error message.
*/

void set_stmt_errmsg(MYSQL_STMT * stmt, const char *err, int errcode,
                     const char *sqlstate)
{
  DBUG_ENTER("set_stmt_errmsg");
  DBUG_PRINT("enter", ("error: %d/%s '%s'", errcode, sqlstate, err));
  DBUG_ASSERT(stmt != 0);

  stmt->last_errno= errcode;
  if (err && err[0])
    strmov(stmt->last_error, err);
  strmov(stmt->sqlstate, sqlstate);

  DBUG_VOID_RETURN;
}

/*
  Read and unpack server reply to COM_PREPARE command (sent from
  mysql_stmt_prepare).

  SYNOPSIS
    cli_read_prepare_result()
    mysql   connection handle
    stmt    statement handle

  RETURN VALUES
    0	ok
    1	error
*/

my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
{
  uchar *pos;
  uint field_count, param_count;
  MYSQL_DATA *fields_data;
  DBUG_ENTER("read_prepare_result");

  mysql= mysql->last_used_con;
  if (net_safe_read(mysql) == packet_error)
    DBUG_RETURN(1);

  pos= (uchar*) mysql->net.read_pos;
  stmt->stmt_id= uint4korr(pos+1); pos+= 5;
  /* Number of columns in result set */
  field_count=   uint2korr(pos);   pos+= 2;
  /* Number of placeholders in the statement */
  param_count=   uint2korr(pos);   pos+= 2;

  if (param_count != 0)
  {
    MYSQL_DATA *param_data;

    /* skip parameters data: we don't support it yet */
    if (!(param_data= (*mysql->methods->read_rows)(mysql, (MYSQL_FIELD*)0, 7)))
      DBUG_RETURN(1);
    free_rows(param_data);
  }

  if (field_count != 0)
  {
    if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
      mysql->server_status|= SERVER_STATUS_IN_TRANS;

    mysql->extra_info= net_field_length_ll(&pos);
    if (!(fields_data= (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,7)))
      DBUG_RETURN(1);
    if (!(stmt->fields= unpack_fields(fields_data,&stmt->mem_root,
				      field_count,0,
				      mysql->server_capabilities)))
      DBUG_RETURN(1);
  }
  stmt->field_count=  (uint) field_count;
  stmt->param_count=  (ulong) param_count;
  mysql->warning_count= 0;

  DBUG_RETURN(0);
}


/*
  Allocate memory and init prepared statement structure.

  SYNOPSIS
    mysql_stmt_init()
    mysql   connection handle

  DESCRIPTION
    This is an entry point of the new API. Returned handle stands for
    a server-side prepared statement. Memory for this structure (~700
    bytes) is allocated using 'malloc'. Once created, the handle can be
    reused many times. Created statement handle is bound to connection
    handle provided to this call: its lifetime is limited by lifetime
    of connection.
    'mysql_stmt_init()' is a pure local call, server side structure is
    created only in mysql_stmt_prepare.
    Next steps you may want to make:
    - set a statement attribute (mysql_stmt_attr_set()),
    - prepare statement handle with a query (mysql_stmt_prepare()),
    - close statement handle and free its memory (mysql_stmt_close()),
    - reset statement with mysql_stmt_reset() (a no-op which will
      just return).
    Behaviour of the rest of API calls on this statement is not defined yet
    (though we're working on making each wrong call sequence return
    error).

  RETURN VALUE
    statement structure upon success and NULL if out of
    memory
*/

MYSQL_STMT * STDCALL
mysql_stmt_init(MYSQL *mysql)
{
  MYSQL_STMT *stmt;
  DBUG_ENTER("mysql_stmt_init");

  if (!(stmt= (MYSQL_STMT *) my_malloc(sizeof(MYSQL_STMT),
                                       MYF(MY_WME | MY_ZEROFILL))))
  {
    set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }

  init_alloc_root(&stmt->mem_root, 2048, 2048);
  init_alloc_root(&stmt->result.alloc, 4096, 4096);
  stmt->result.alloc.min_malloc= sizeof(MYSQL_ROWS);
  mysql->stmts= list_add(mysql->stmts, &stmt->list);
  stmt->list.data= stmt;
  stmt->state= MYSQL_STMT_INIT_DONE;
  stmt->mysql= mysql;
  stmt->read_row_func= stmt_read_row_no_data;
  /* The rest of statement members was bzeroed inside malloc */

  DBUG_RETURN(stmt);
}


/*
  Prepare server side statement with query.

  SYNOPSIS
    mysql_stmt_prepare()
    stmt    statement handle
    query   statement to prepare
    length  statement length

  DESCRIPTION
    Associate statement with statement handle. This is done both on
    client and server sides. At this point the server parses given query
    and creates an internal structure to represent it.
    Next steps you may want to make:
    - find out if this statement returns a result set by
      calling mysql_stmt_field_count(), and get result set metadata
      with mysql_stmt_result_metadata(),
    - if query contains placeholders, bind input parameters to placeholders
      using mysql_stmt_bind_param(),
    - otherwise proceed directly to mysql_stmt_execute().

  IMPLEMENTATION NOTES
  - if this is a re-prepare of the statement, first close previous data
    structure on the server and free old statement data
  - then send the query to server and get back number of placeholders,
    number of columns in result set (if any), and result set metadata.
    At the same time allocate memory for input and output parameters
    to have less checks in mysql_stmt_bind_{param, result}.

  RETURN VALUES
    0  success
   !0  error
*/

int STDCALL
mysql_stmt_prepare(MYSQL_STMT *stmt, const char *query, ulong length)
{
  MYSQL *mysql= stmt->mysql;
  DBUG_ENTER("mysql_stmt_prepare");

  if (!mysql)
  {
    /* mysql can be reset in mysql_close called from mysql_reconnect */
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
    DBUG_RETURN(1);
  }

  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    /* This is second prepare with another statement */
    char buff[MYSQL_STMT_HEADER];               /* 4 bytes - stmt id */

    mysql_stmt_free_result(stmt);
    /*
      These members must be reset for API to
      function in case of error or misuse.
    */
    stmt->bind_param_done= stmt->bind_result_done= FALSE;
    stmt->param_count= stmt->field_count= 0;
    stmt->last_errno= 0;
    stmt->last_error[0]= '\0';
    free_root(&stmt->mem_root, MYF(MY_KEEP_PREALLOC));

    int4store(buff, stmt->stmt_id);
    /*
      If there was a 'use' result from another statement, or from
      mysql_use_result it won't be freed in mysql_stmt_free_result and
      we should get 'Commands out of sync' here.
    */
    if (simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1))
    {
      set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                      mysql->net.sqlstate);
      DBUG_RETURN(1);
    }
    stmt->state= MYSQL_STMT_INIT_DONE;
  }

  if (simple_command(mysql, COM_PREPARE, query, length, 1))
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
    DBUG_RETURN(1);
  }

  if ((*mysql->methods->read_prepare_result)(mysql, stmt))
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
    DBUG_RETURN(1);
  }

  /*
    alloc_root will return valid address even in case when param_count
    and field_count are zero. Thus we should never rely on stmt->bind
    or stmt->params when checking for existence of placeholders or
    result set.
  */
  if (!(stmt->params= (MYSQL_BIND *) alloc_root(&stmt->mem_root,
						sizeof(MYSQL_BIND)*
                                                (stmt->param_count +
                                                 stmt->field_count))))
  {
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(1);
  }
  stmt->bind= stmt->params + stmt->param_count;
  stmt->state= MYSQL_STMT_PREPARE_DONE;
  DBUG_PRINT("info", ("Parameter count: %ld", stmt->param_count));
  DBUG_RETURN(0);
}

/*
  Get result set metadata from reply to mysql_stmt_execute.
  This is used mainly for SHOW commands, as metadata for these
  commands is sent only with result set.
  To be removed when all commands will fully support prepared mode.
*/

static unsigned int alloc_stmt_fields(MYSQL_STMT *stmt)
{
  MYSQL_FIELD *fields, *field, *end;
  MEM_ROOT *alloc= &stmt->mem_root;
  MYSQL *mysql= stmt->mysql->last_used_con;

  stmt->field_count= mysql->field_count;

  /*
    Get the field information for non-select statements
    like SHOW and DESCRIBE commands
  */
  if (!(stmt->fields= (MYSQL_FIELD *) alloc_root(alloc,
						 sizeof(MYSQL_FIELD) *
						 stmt->field_count)) ||
      !(stmt->bind= (MYSQL_BIND *) alloc_root(alloc,
					      sizeof(MYSQL_BIND) *
					      stmt->field_count)))
    return 0;

  for (fields= mysql->fields, end= fields+stmt->field_count,
	 field= stmt->fields;
       field && fields < end; fields++, field++)
  {
    field->db       = strdup_root(alloc,fields->db);
    field->table    = strdup_root(alloc,fields->table);
    field->org_table= strdup_root(alloc,fields->org_table);
    field->name     = strdup_root(alloc,fields->name);
    field->org_name = strdup_root(alloc,fields->org_name);
    field->charsetnr= fields->charsetnr;
    field->length   = fields->length;
    field->type     = fields->type;
    field->flags    = fields->flags;
    field->decimals = fields->decimals;
    field->def      = fields->def ? strdup_root(alloc,fields->def): 0;
    field->max_length= 0;
  }
  return stmt->field_count;
}


/*
  Update result set columns metadata if it was sent again in
  reply to COM_EXECUTE.
*/

static void update_stmt_fields(MYSQL_STMT *stmt)
{
  MYSQL_FIELD *field= stmt->mysql->fields;
  MYSQL_FIELD *field_end= field + stmt->field_count;
  MYSQL_FIELD *stmt_field= stmt->fields;

  DBUG_ASSERT(stmt->field_count == stmt->mysql->field_count);

  for (; field < field_end; ++field, ++stmt_field)
  {
    stmt_field->charsetnr= field->charsetnr;
    stmt_field->length   = field->length;
    stmt_field->type     = field->type;
    stmt_field->flags    = field->flags;
    stmt_field->decimals = field->decimals;
  }
}

/*
  Returns prepared statement metadata in the form of a result set.

  SYNOPSIS
    mysql_stmt_result_metadata()
    stmt  statement handle

  DESCRIPTION
    This function should be used after mysql_stmt_execute().
    You can safely check that prepared statement has a result set by calling
    mysql_stmt_num_fields(): if number of fields is not zero, you can call
    this function to get fields metadata.
    Next steps you may want to make:
    - find out number of columns in result set by calling
      mysql_num_fields(res) (the same value is returned by
      mysql_stmt_num_fields)
    - fetch metadata for any column with mysql_fetch_field,
      mysql_fetch_field_direct, mysql_fetch_fields, mysql_field_seek.
    - free returned MYSQL_RES structure with mysql_free_result.
    - proceed to binding of output parameters.

  RETURN
    NULL  statement contains no result set or out of memory.
          In the latter case you can retreive error message
          with mysql_stmt_error.
    MYSQL_RES  a result set with no rows
*/

MYSQL_RES * STDCALL
mysql_stmt_result_metadata(MYSQL_STMT *stmt)
{
  MYSQL_RES *result;
  DBUG_ENTER("mysql_stmt_result_metadata");

  /*
    stmt->fields is only defined if stmt->field_count is not null;
    stmt->field_count is initialized in prepare.
  */
  if (!stmt->field_count)
     DBUG_RETURN(0);

  if (!(result=(MYSQL_RES*) my_malloc(sizeof(*result),
                                      MYF(MY_WME | MY_ZEROFILL))))
  {
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }

  result->methods=	stmt->mysql->methods;
  result->eof=		1;                      /* Marker for buffered */
  result->fields=	stmt->fields;
  result->field_count=	stmt->field_count;
  /* The rest of members of 'result' was bzeroed inside malloc */
  DBUG_RETURN(result);
}


/*
  Returns parameter columns meta information in the form of
  result set.

  SYNOPSYS
    mysql_stmt_param_metadata()
    stmt    statement handle

  DESCRIPTION
    This function can be called after you prepared the statement handle
    with mysql_stmt_prepare().
    XXX: not implemented yet.

  RETURN
    MYSQL_RES on success, 0 if there is no metadata.
    Currently this function always returns 0.
*/

MYSQL_RES * STDCALL
mysql_stmt_param_metadata(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_param_metadata");

  if (!stmt->param_count)
    DBUG_RETURN(0);

  /*
    TODO: Fix this when server sends the information.
    Till then keep a dummy prototype.
  */
  DBUG_RETURN(0); 
}


/* Store type of parameter in network buffer. */

static void store_param_type(char **pos, MYSQL_BIND *param)
{
  uint typecode= param->buffer_type | (param->is_unsigned ? 32768 : 0);
  int2store(*pos, typecode);
  *pos+= 2;
}


/*
  Functions to store parameter data in network packet.

  SYNOPSIS
    store_param_xxx()
    net			MySQL NET connection
    param		MySQL bind param

  DESCRIPTION
    These funtions are invoked from mysql_stmt_execute() by
    MYSQL_BIND::store_param_func pointer. This pointer is set once per
    many executions in mysql_stmt_bind_param(). The caller must ensure
    that network buffer have enough capacity to store parameter
    (MYSQL_BIND::buffer_length contains needed number of bytes).
*/

static void store_param_tinyint(NET *net, MYSQL_BIND *param)
{
  *(net->write_pos++)= *(uchar *) param->buffer;
}

static void store_param_short(NET *net, MYSQL_BIND *param)
{
  short value= *(short*) param->buffer;
  int2store(net->write_pos,value);
  net->write_pos+=2;
}

static void store_param_int32(NET *net, MYSQL_BIND *param)
{
  int32 value= *(int32*) param->buffer;
  int4store(net->write_pos,value);
  net->write_pos+=4;
}

static void store_param_int64(NET *net, MYSQL_BIND *param)
{
  longlong value= *(longlong*) param->buffer;
  int8store(net->write_pos,value);
  net->write_pos+= 8;
}

static void store_param_float(NET *net, MYSQL_BIND *param)
{
  float value= *(float*) param->buffer;
  float4store(net->write_pos, value);
  net->write_pos+= 4;
}

static void store_param_double(NET *net, MYSQL_BIND *param)
{
  double value= *(double*) param->buffer;
  float8store(net->write_pos, value);
  net->write_pos+= 8;
}

static void store_param_time(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  char buff[MAX_TIME_REP_LENGTH], *pos;
  uint length;

  pos= buff+1;
  pos[0]= tm->neg ? 1: 0;
  int4store(pos+1, tm->day);
  pos[5]= (uchar) tm->hour;
  pos[6]= (uchar) tm->minute;
  pos[7]= (uchar) tm->second;
  int4store(pos+8, tm->second_part);
  if (tm->second_part)
    length= 12;
  else if (tm->hour || tm->minute || tm->second || tm->day)
    length= 8;
  else
    length= 0;
  buff[0]= (char) length++;
  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void net_store_datetime(NET *net, MYSQL_TIME *tm)
{
  char buff[MAX_DATETIME_REP_LENGTH], *pos;
  uint length;

  pos= buff+1;

  int2store(pos, tm->year);
  pos[2]= (uchar) tm->month;
  pos[3]= (uchar) tm->day;
  pos[4]= (uchar) tm->hour;
  pos[5]= (uchar) tm->minute;
  pos[6]= (uchar) tm->second;
  int4store(pos+7, tm->second_part);
  if (tm->second_part)
    length= 11;
  else if (tm->hour || tm->minute || tm->second)
    length= 7;
  else if (tm->year || tm->month || tm->day)
    length= 4;
  else
    length= 0;
  buff[0]= (char) length++;
  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void store_param_date(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  tm->hour= tm->minute= tm->second= 0;
  tm->second_part= 0;
  net_store_datetime(net, tm);
}

static void store_param_datetime(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  net_store_datetime(net, tm);
}

static void store_param_str(NET *net, MYSQL_BIND *param)
{
  /* param->length is always set in mysql_stmt_bind_param */
  ulong length= *param->length;
  char *to= (char *) net_store_length((char *) net->write_pos, length);
  memcpy(to, param->buffer, length);
  net->write_pos= (uchar*) to+length;
}


/*
  Mark if the parameter is NULL.

  SYNOPSIS
    store_param_null()
    net			MySQL NET connection
    param		MySQL bind param

  DESCRIPTION
    A data package starts with a string of bits where we set a bit
    if a parameter is NULL. Unlike bit string in result set row, here
    we don't have reserved bits for OK/error packet.
*/

static void store_param_null(NET *net, MYSQL_BIND *param)
{
  uint pos= param->param_number;
  net->buff[pos/8]|=  (uchar) (1 << (pos & 7));
}


/*
  Store one parameter in network packet: data is read from
  client buffer and saved in network packet by means of one
  of store_param_xxxx functions.
*/

static my_bool store_param(MYSQL_STMT *stmt, MYSQL_BIND *param)
{
  NET *net= &stmt->mysql->net;
  DBUG_ENTER("store_param");
  DBUG_PRINT("enter",("type: %d, buffer:%lx, length: %lu  is_null: %d",
		      param->buffer_type,
		      param->buffer ? param->buffer : "0", *param->length,
		      *param->is_null));

  if (*param->is_null)
    store_param_null(net, param);
  else
  {
    /*
      Param->length should ALWAYS point to the correct length for the type
      Either to the length pointer given by the user or param->buffer_length
    */
    if ((my_realloc_str(net, *param->length)))
    {
      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
      DBUG_RETURN(1);
    }
    (*param->store_param_func)(net, param);
  }
  DBUG_RETURN(0);
}


/*
  Auxilary function to send COM_EXECUTE packet to server and read reply.
  Used from cli_stmt_execute, which is in turn used by mysql_stmt_execute.
*/

static my_bool execute(MYSQL_STMT *stmt, char *packet, ulong length)
{
  MYSQL *mysql= stmt->mysql;
  NET	*net= &mysql->net;
  char buff[4 /* size of stmt id */ +
            5 /* execution flags */];
  DBUG_ENTER("execute");
  DBUG_PRINT("enter",("packet: %s, length :%d",packet ? packet :" ", length));

  mysql->last_used_con= mysql;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
  buff[4]= (char) 0;                            /* no flags */
  int4store(buff+5, 1);                         /* iteration count */
  if (cli_advanced_command(mysql, COM_EXECUTE, buff, sizeof(buff),
                           packet, length, 1) ||
      (*mysql->methods->read_query_result)(mysql))
  {
    set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
    DBUG_RETURN(1);
  }
  stmt->affected_rows= mysql->affected_rows;
  stmt->insert_id= mysql->insert_id;
  DBUG_RETURN(0);
}


int cli_stmt_execute(MYSQL_STMT *stmt)
{
  DBUG_ENTER("cli_stmt_execute");

  if (stmt->param_count)
  {
    NET        *net= &stmt->mysql->net;
    MYSQL_BIND *param, *param_end;
    char       *param_data;
    ulong length;
    uint null_count;
    my_bool    result;

    if (!stmt->bind_param_done)
    {
      set_stmt_error(stmt, CR_PARAMS_NOT_BOUND, unknown_sqlstate);
      DBUG_RETURN(1);
    }

    net_clear(net);				/* Sets net->write_pos */
    /* Reserve place for null-marker bytes */
    null_count= (stmt->param_count+7) /8;
    if (my_realloc_str(net, null_count + 1))
    {
      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
      DBUG_RETURN(1);
    }
    bzero((char*) net->write_pos, null_count);
    net->write_pos+= null_count;
    param_end= stmt->params + stmt->param_count;

    /* In case if buffers (type) altered, indicate to server */
    *(net->write_pos)++= (uchar) stmt->send_types_to_server;
    if (stmt->send_types_to_server)
    {
      if (my_realloc_str(net, 2 * stmt->param_count))
      {
        set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
        DBUG_RETURN(1);
      }
      /*
	Store types of parameters in first in first package
	that is sent to the server.
      */
      for (param= stmt->params;	param < param_end ; param++)
        store_param_type((char**) &net->write_pos, param);
    }

    for (param= stmt->params; param < param_end; param++)
    {
      /* check if mysql_stmt_send_long_data() was used */
      if (param->long_data_used)
	param->long_data_used= 0;	/* Clear for next execute call */
      else if (store_param(stmt, param))
	DBUG_RETURN(1);
    }
    length= (ulong) (net->write_pos - net->buff);
    /* TODO: Look into avoding the following memdup */
    if (!(param_data= my_memdup((const char*) net->buff, length, MYF(0))))
    {
      set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
      DBUG_RETURN(1);
    }
    result= execute(stmt, param_data, length);
    stmt->send_types_to_server=0;
    my_free(param_data, MYF(MY_WME));
    DBUG_RETURN(result);
  }
  DBUG_RETURN((int) execute(stmt,0,0));
}

/*
  Read one row from buffered result set.  Result set is created by prior
  call to mysql_stmt_store_result().
  SYNOPSIS
    stmt_read_row_buffered()

  RETURN VALUE
    0             - success; *row is set to valid row pointer (row data
                    is stored in result set buffer)
    MYSQL_NO_DATA - end of result set. *row is set to NULL
*/

static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row)
{
  if (stmt->data_cursor)
  {
    *row= (uchar *) stmt->data_cursor->data;
    stmt->data_cursor= stmt->data_cursor->next;
    return 0;
  }
  *row= 0;
  return MYSQL_NO_DATA;
}

/*
  Read one row from network: unbuffered non-cursor fetch.
  If last row was read, or error occured, erase this statement
  from record pointing to object unbuffered fetch is performed from.

  SYNOPSIS
    stmt_read_row_unbuffered()
    stmt  statement handle
    row   pointer to write pointer to row data;

  RETURN VALUE
    0           - success; *row contains valid address of a row;
                  row data is stored in network buffer
    1           - error; error code is written to
                  stmt->last_{errno,error}; *row is not changed
  MYSQL_NO_DATA - end of file was read from network;
                  *row is set to NULL
*/

static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row)
{
  int rc= 1;
  MYSQL *mysql= stmt->mysql;
  /*
    This function won't be called if stmt->field_count is zero
    or execution wasn't done: this is ensured by mysql_stmt_execute.
  */
  if (!mysql)
  {
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
    return 1;
  }
  if (mysql->status != MYSQL_STATUS_GET_RESULT)
  {
    set_stmt_error(stmt, stmt->unbuffered_fetch_cancelled ?
                   CR_FETCH_CANCELED : CR_COMMANDS_OUT_OF_SYNC,
                   unknown_sqlstate);
    goto error;
  }
  if ((*mysql->methods->unbuffered_fetch)(mysql, (char**) row))
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
    /*
      If there was an error, there are no more pending rows:
      reset statement status to not hang up in following
      mysql_stmt_close (it will try to flush result set before
      closing the statement).
    */
    mysql->status= MYSQL_STATUS_READY;
    goto error;
  }
  if (!*row)
  {
    mysql->status= MYSQL_STATUS_READY;
    rc= MYSQL_NO_DATA;
    goto error;
  }
  return 0;
error:
  if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
    mysql->unbuffered_fetch_owner= 0;
  return rc;
}

/*
  Default read row function to not SIGSEGV in client in
  case of wrong sequence of API calls.
*/

static int
stmt_read_row_no_data(MYSQL_STMT *stmt  __attribute__((unused)),
                      unsigned char **row  __attribute__((unused)))
{
  if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
  {
    set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
    return 1;
  }
  return MYSQL_NO_DATA;
}


/*
  Get/set statement attributes

  SYNOPSIS
    mysql_stmt_attr_get()
    mysql_stmt_attr_set()

    attr_type  statement attribute
    value      casted to const void * pointer to value.

  RETURN VALUE
    0 success
   !0 wrong attribute type
*/

my_bool STDCALL mysql_stmt_attr_set(MYSQL_STMT *stmt,
                                    enum enum_stmt_attr_type attr_type,
                                    const void *value)
{
  switch (attr_type) {
  case STMT_ATTR_UPDATE_MAX_LENGTH:
    stmt->update_max_length= value ? *(const my_bool*) value : 0;
    break;
  default:
    return TRUE;
  }
  return FALSE;
}


my_bool STDCALL mysql_stmt_attr_get(MYSQL_STMT *stmt,
                                    enum enum_stmt_attr_type attr_type,
                                    void *value)
{
  switch (attr_type) {
  case STMT_ATTR_UPDATE_MAX_LENGTH:
    *(unsigned long *) value= stmt->update_max_length;
    break;
  default:
    return TRUE;
  }
  return FALSE;
}


/*
  Send placeholders data to server (if there are placeholders)
  and execute prepared statement.

  SYNOPSIS
    mysql_stmt_execute()
    stmt  statement handle. The handle must be created
          with mysql_stmt_init() and prepared with
          mysql_stmt_prepare(). If there are placeholders
          in the statement they must be bound to local
          variables with mysql_stmt_bind_param().

  DESCRIPTION
    This function will automatically flush pending result
    set (if there is one), send parameters data to the server
    and read result of statement execution.
    If previous result set was cached with mysql_stmt_store_result()
    it will also be freed in the beginning of this call.
    The server can return 3 types of responses to this command:
    - error, can be retrieved with mysql_stmt_error()
    - ok, no result set pending. In this case we just update
      stmt->insert_id and stmt->affected_rows.
    - the query returns a result set: there could be 0 .. N
    rows in it. In this case the server can also send updated
    result set metadata.

    Next steps you may want to make:
    - find out if there is result set with mysql_stmt_field_count().
    If there is one:
    - optionally, cache entire result set on client to unblock
    connection with mysql_stmt_store_result()
    - bind client variables to result set columns and start read rows
    with mysql_stmt_fetch().
    - reset statement with mysql_stmt_reset() or close it with
    mysql_stmt_close()
    Otherwise:
    - find out last insert id and number of affected rows with
    mysql_stmt_insert_id(), mysql_stmt_affected_rows()

  RETURN
    0   success
    1   error, message can be retrieved with mysql_stmt_error().
*/

int STDCALL mysql_stmt_execute(MYSQL_STMT *stmt)
{
  MYSQL *mysql= stmt->mysql;
  DBUG_ENTER("mysql_stmt_execute");

  if (!mysql)
  {
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
    DBUG_RETURN(1);
  }

  mysql_stmt_free_result(stmt);
  /*
    No need to check for stmt->state: if the statement wasn't
    prepared we'll get 'unknown statement handler' error from server.
  */
  if (mysql->methods->stmt_execute(stmt))
    DBUG_RETURN(1);
  if (mysql->field_count)
  {
    /* Server has sent result set metadata */
    if (stmt->field_count == 0)
    {
      /*
        This is 'SHOW'/'EXPLAIN'-like query. Current implementation of
        prepared statements can't send result set metadata for these queries
        on prepare stage. Read it now.
      */
      alloc_stmt_fields(stmt);
    }
    else
    {
      /*
        Update result set metadata if it for some reason changed between
        prepare and execute, i.e.:
        - in case of 'SELECT ?' we don't know column type unless data was
          supplied to mysql_stmt_execute, so updated column type is sent
          now.
        - if data dictionary changed between prepare and execute, for
          example a table used in the query was altered.
        Note, that now (4.1.3) we always send metadata in reply to
        COM_EXECUTE (even if it is not necessary), so either this or
        previous branch always works.
        TODO: send metadata only when it's really necessary and add a warning
        'Metadata changed' when it's sent twice.
      */
      update_stmt_fields(stmt);
    }
  }
  stmt->state= MYSQL_STMT_EXECUTE_DONE;
  if (stmt->field_count)
  {
    stmt->mysql->unbuffered_fetch_owner= &stmt->unbuffered_fetch_cancelled;
    stmt->unbuffered_fetch_cancelled= FALSE;
    stmt->read_row_func= stmt_read_row_unbuffered;
  }
  DBUG_RETURN(0);
}


/*
  Return total parameters count in the statement
*/

ulong STDCALL mysql_stmt_param_count(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_param_count");
  DBUG_RETURN(stmt->param_count);
}

/*
  Return total affected rows from the last statement
*/

my_ulonglong STDCALL mysql_stmt_affected_rows(MYSQL_STMT *stmt)
{
  return stmt->affected_rows;
}


/*
  Returns the number of result columns for the most recent query
  run on this statement.
*/

unsigned int STDCALL mysql_stmt_field_count(MYSQL_STMT *stmt)
{
  return stmt->field_count;
}

/*
  Return last inserted id for auto_increment columns.

  SYNOPSIS
    mysql_stmt_insert_id()
    stmt    statement handle

  DESCRIPTION
    Current implementation of this call has a caveat: stmt->insert_id is
    unconditionally updated from mysql->insert_id in the end of each
    mysql_stmt_execute(). This works OK if mysql->insert_id contains new
    value (sent in reply to mysql_stmt_execute()), otherwise stmt->insert_id
    value gets undefined, as it's updated from some arbitrary value saved in
    connection structure during some other call.
*/

my_ulonglong STDCALL mysql_stmt_insert_id(MYSQL_STMT *stmt)
{
  return stmt->insert_id;
}


static my_bool int_is_null_true= 1;		/* Used for MYSQL_TYPE_NULL */
static my_bool int_is_null_false= 0;


/*
  Set up input data buffers for a statement.

  SYNOPSIS
    mysql_stmt_bind_param()
    stmt    statement handle
            The statement must be prepared with mysql_stmt_prepare().
    bind    Array of mysql_stmt_param_count() bind parameters.
            This function doesn't check that size of this argument
            is >= mysql_stmt_field_count(): it's user's responsibility.

  DESCRIPTION
    Use this call after mysql_stmt_prepare() to bind user variables to
    placeholders.
    Each element of bind array stands for a placeholder. Placeholders
    are counted from 0.  For example statement
    'INSERT INTO t (a, b) VALUES (?, ?)'
    contains two placeholders, and for such statement you should supply
    bind array of two elements (MYSQL_BIND bind[2]).

    By properly initializing bind array you can bind virtually any
    C language type to statement's placeholders:
    First, it's strongly recommended to always zero-initialize entire
    bind structure before setting its members. This will both shorten
    your application code and make it robust to future extensions of
    MYSQL_BIND structure.
    Then you need to assign typecode of your application buffer to
    MYSQL_BIND::buffer_type. The following typecodes with their
    correspondence to C language types are supported:
    MYSQL_TYPE_TINY       for 8-bit integer variables. Normally it's
                          'signed char' and 'unsigned char';
    MYSQL_TYPE_SHORT      for 16-bit signed and unsigned variables. This
                          is usually 'short' and 'unsigned short';
    MYSQL_TYPE_LONG       for 32-bit signed and unsigned variables. It
                          corresponds to 'int' and 'unsigned int' on
                          vast majority of platforms. On IA-32 and some
                          other 32-bit systems you can also use 'long'
                          here;
    MYSQL_TYPE_LONGLONG   64-bit signed or unsigned integer.  Stands for
                          '[unsigned] long long' on most platforms;
    MYSQL_TYPE_FLOAT      32-bit floating point type, 'float' on most
                          systems;
    MYSQL_TYPE_DOUBLE     64-bit floating point type, 'double' on most
                          systems;
    MYSQL_TYPE_TIME       broken-down time stored in MYSQL_TIME
                          structure
    MYSQL_TYPE_DATE       date stored in MYSQL_TIME structure
    MYSQL_TYPE_DATETIME   datetime stored in MYSQL_TIME structure See
                          more on how to use these types for sending
                          dates and times below;
    MYSQL_TYPE_STRING     character string, assumed to be in
                          character-set-client. If character set of
                          client is not equal to character set of
                          column, value for this placeholder will be
                          converted to destination character set before
                          insert.
    MYSQL_TYPE_BLOB       sequence of bytes. This sequence is assumed to
                          be in binary character set (which is the same
                          as no particular character set), and is never
                          converted to any other character set. See also
                          notes about supplying string/blob length
                          below.
    MYSQL_TYPE_NULL       special typecode for binding nulls.
    These C/C++ types are not supported yet by the API: long double,
    bool.

    As you can see from the list above, it's responsibility of
    application programmer to ensure that chosen typecode properly
    corresponds to host language type. For example on all platforms
    where we build MySQL packages (as of MySQL 4.1.4) int is a 32-bit
    type. So for int you can always assume that proper typecode is
    MYSQL_TYPE_LONG (however queer it sounds, the name is legacy of the
    old MySQL API). In contrary sizeof(long) can be 4 or 8 8-bit bytes,
    depending on platform.

    TODO: provide client typedefs for each integer and floating point
    typecode, i. e. int8, uint8, float32, etc.

    Once typecode was set, it's necessary to assign MYSQL_BIND::buffer
    to point to the buffer of given type. Finally, additional actions
    may be taken for some types or use cases:

      Binding integer types.
    For integer types you might also need to set MYSQL_BIND::is_unsigned
    member. Set it to TRUE when binding unsigned char, unsigned short,
    unsigned int, unsigned long, unsigned long long.

      Binding floating point types.
    For floating point types you just need to set
    MYSQL_BIND::buffer_type and MYSQL_BIND::buffer. The rest of the
    members should be zero-initialized.

      Binding NULLs.
    You might have a column always NULL, never NULL, or sometimes NULL.
    For an always NULL column set MYSQL_BIND::buffer_type to
    MYSQL_TYPE_NULL.  The rest of the members just need to be
    zero-initialized.  For never NULL columns set MYSQL_BIND::is_null to
    0, or this has already been done if you zero-initialized the entire
    structure.  If you set MYSQL_TYPE::is_null to point to an
    application buffer of type 'my_bool', then this buffer will be
    checked on each execution: this way you can set the buffer to TRUE,
    or any non-0 value for NULLs, and to FALSE or 0 for not NULL data.

      Binding text strings and sequences of bytes.
    For strings, in addition to MYSQL_BIND::buffer_type and
    MYSQL_BIND::buffer you need to set MYSQL_BIND::length or
    MYSQL_BIND::buffer_length.
    If 'length' is set, 'buffer_length' is ignored. 'buffer_length'
    member should be used when size of string doesn't change between
    executions. If you want to vary buffer length for each value, set
    'length' to point to an application buffer of type 'unsigned long'
    and set this long to length of the string before each
    mysql_stmt_execute().

      Binding dates and times.
    For binding dates and times prepared statements API provides clients
    with MYSQL_TIME structure. A pointer to instance of this structure
    should be assigned to MYSQL_BIND::buffer whenever MYSQL_TYPE_TIME,
    MYSQL_TYPE_DATE, MYSQL_TYPE_DATETIME typecodes are used.  When
    typecode is MYSQL_TYPE_TIME, only members 'hour', 'minute', 'second'
    and 'neg' (is time offset negative) are used. These members only
    will be sent to the server.
    MYSQL_TYPE_DATE implies use of 'year', 'month', 'day', 'neg'.
    MYSQL_TYPE_DATETIME utilizes both parts of MYSQL_TIME structure.
    You don't have to set MYSQL_TIME::time_type member: it's not used
    when sending data to the server, typecode information is enough.
    'second_part' member can hold microsecond precision of time value,
    but now it's only supported on protocol level: you can't store
    microsecond in a column, or use in temporal calculations. However,
    if you send a time value with microsecond part for 'SELECT ?',
    statement, you'll get it back unchanged from the server.

      Data conversion.
    If conversion from host language type to data representation,
    corresponding to SQL type, is required it's done on the server.
    Data truncation is possible when conversion is lossy. For example,
    if you supply MYSQL_TYPE_DATETIME value out of valid SQL type
    TIMESTAMP range, the same conversion will be applied as if this
    value would have been sent as string in the old protocol.
    TODO: document how the server will behave in case of truncation/data
    loss.

    After variables were bound, you can repeatedly set/change their
    values and mysql_stmt_execute() the statement.

    See also: mysql_stmt_send_long_data() for sending long text/blob
    data in pieces, examples in tests/client_test.c.
    Next steps you might want to make:
    - execute statement with mysql_stmt_execute(),
    - reset statement using mysql_stmt_reset() or reprepare it with
      another query using mysql_stmt_prepare()
    - close statement with mysql_stmt_close().

  IMPLEMENTATION
    The function copies given bind array to internal storage of the
    statement, and sets up typecode-specific handlers to perform
    serialization of bound data. This means that although you don't need
    to call this routine after each assignment to bind buffers, you
    need to call it each time you change parameter typecodes, or other
    members of MYSQL_BIND array.
    This is a pure local call. Data types of client buffers are sent
    along with buffers' data at first execution of the statement.

  RETURN
    0  success
    1  error, can be retrieved with mysql_stmt_error.
*/

my_bool STDCALL mysql_stmt_bind_param(MYSQL_STMT *stmt, MYSQL_BIND *bind)
{
  uint count=0;
  MYSQL_BIND *param, *end;
  DBUG_ENTER("mysql_stmt_bind_param");

  if (!stmt->param_count)
  {
    if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
    {
      set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
      DBUG_RETURN(1);
    }
    DBUG_RETURN(0);
  }

  /* Allocated on prepare */
  memcpy((char*) stmt->params, (char*) bind,
	 sizeof(MYSQL_BIND) * stmt->param_count);

  for (param= stmt->params, end= param+stmt->param_count;
       param < end ;
       param++)
  {
    param->param_number= count++;
    param->long_data_used= 0;

    /* If param->is_null is not set, then the value can never be NULL */
    if (!param->is_null)
      param->is_null= &int_is_null_false;

    /* Setup data copy functions for the different supported types */
    switch (param->buffer_type) {
    case MYSQL_TYPE_NULL:
      param->is_null= &int_is_null_true;
      break;
    case MYSQL_TYPE_TINY:
      /* Force param->length as this is fixed for this type */
      param->length= &param->buffer_length;
      param->buffer_length= 1;
      param->store_param_func= store_param_tinyint;
      break;
    case MYSQL_TYPE_SHORT:
      param->length= &param->buffer_length;
      param->buffer_length= 2;
      param->store_param_func= store_param_short;
      break;
    case MYSQL_TYPE_LONG:
      param->length= &param->buffer_length;
      param->buffer_length= 4;
      param->store_param_func= store_param_int32;
      break;
    case MYSQL_TYPE_LONGLONG:
      param->length= &param->buffer_length;
      param->buffer_length= 8;
      param->store_param_func= store_param_int64;
      break;
    case MYSQL_TYPE_FLOAT:
      param->length= &param->buffer_length;
      param->buffer_length= 4;
      param->store_param_func= store_param_float;
      break;
    case MYSQL_TYPE_DOUBLE:
      param->length= &param->buffer_length;
      param->buffer_length= 8;
      param->store_param_func= store_param_double;
      break;
    case MYSQL_TYPE_TIME:
      param->store_param_func= store_param_time;
      param->buffer_length= MAX_TIME_REP_LENGTH;
      break;
    case MYSQL_TYPE_DATE:
      param->store_param_func= store_param_date;
      param->buffer_length= MAX_DATE_REP_LENGTH;
      break;
    case MYSQL_TYPE_DATETIME:
    case MYSQL_TYPE_TIMESTAMP:
      param->store_param_func= store_param_datetime;
      param->buffer_length= MAX_DATETIME_REP_LENGTH;
      break;
    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
    case MYSQL_TYPE_BLOB:
    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
      param->store_param_func= store_param_str;
      /*
        For variable length types user must set either length or
        buffer_length.
      */
      break;
    default:
      strmov(stmt->sqlstate, unknown_sqlstate);
      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
	      param->buffer_type, count);
      DBUG_RETURN(1);
    }
    /*
      If param->length is not given, change it to point to buffer_length.
      This way we can always use *param->length to get the length of data
    */
    if (!param->length)
      param->length= &param->buffer_length;
  }
  /* We have to send/resend type information to MySQL */
  stmt->send_types_to_server= TRUE;
  stmt->bind_param_done= TRUE;
  DBUG_RETURN(0);
}


/********************************************************************
 Long data implementation
*********************************************************************/

/*
  Send long data in pieces to the server

  SYNOPSIS
    mysql_stmt_send_long_data()
    stmt			Statement handler
    param_number		Parameter number (0 - N-1)
    data			Data to send to server
    length			Length of data to send (may be 0)

  DESCRIPTION
    This call can be used repeatedly to send long data in pieces
    for any string/binary placeholder. Data supplied for
    a placeholder is saved at server side till execute, and then
    used instead of value from MYSQL_BIND object. More precisely,
    if long data for a parameter was supplied, MYSQL_BIND object
    corresponding to this parameter is not sent to server. In the
    end of execution long data states of placeholders are reset,
    so next time values of such placeholders will be taken again
    from MYSQL_BIND array.
    The server does not reply to this call: if there was an error
    in data handling (which now only can happen if server run out
    of memory) it would be returned in reply to
    mysql_stmt_execute().
    You should choose type of long data carefully if you care
    about character set conversions performed by server when the
    statement is executed.  No conversion is performed at all for
    MYSQL_TYPE_BLOB and other binary typecodes. For
    MYSQL_TYPE_STRING and the rest of text placeholders data is
    converted from client character set to character set of
    connection. If these character sets are different, this
    conversion may require additional memory at server, equal to
    total size of supplied pieces.

  RETURN VALUES
    0	ok
    1	error
*/

my_bool STDCALL
mysql_stmt_send_long_data(MYSQL_STMT *stmt, uint param_number,
		     const char *data, ulong length)
{
  MYSQL_BIND *param;
  DBUG_ENTER("mysql_stmt_send_long_data");
  DBUG_ASSERT(stmt != 0);
  DBUG_PRINT("enter",("param no : %d, data : %lx, length : %ld",
		      param_number, data, length));

  /*
    We only need to check for stmt->param_count, if it's not null
    prepare was done.
  */
  if (param_number >= stmt->param_count)
  {
    set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
    DBUG_RETURN(1);
  }

  param= stmt->params+param_number;
  if (param->buffer_type < MYSQL_TYPE_TINY_BLOB ||
      param->buffer_type > MYSQL_TYPE_STRING)
  {
    /* Long data handling should be used only for string/binary types */
    strmov(stmt->sqlstate, unknown_sqlstate);
    sprintf(stmt->last_error, ER(stmt->last_errno= CR_INVALID_BUFFER_USE),
	    param->param_number);
    DBUG_RETURN(1);
  }

  /*
    Send long data packet if there is data or we're sending long data
    for the first time.
  */
  if (length || param->long_data_used == 0)
  {
    MYSQL *mysql= stmt->mysql;
    /* Packet header: stmt id (4 bytes), param no (2 bytes) */
    char buff[MYSQL_LONG_DATA_HEADER];

    int4store(buff, stmt->stmt_id);
    int2store(buff + 4, param_number);
    param->long_data_used= 1;

    /*
      Note that we don't get any ok packet from the server in this case
      This is intentional to save bandwidth.
    */
    if ((*mysql->methods->advanced_command)(mysql, COM_LONG_DATA, buff,
					    sizeof(buff), data, length, 1))
    {
      set_stmt_errmsg(stmt, mysql->net.last_error,
		      mysql->net.last_errno, mysql->net.sqlstate);
      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN(0);
}


/********************************************************************
 Fetch and conversion of result set rows (binary protocol).
*********************************************************************/

/*
  Read date, (time, datetime) value from network buffer and store it
  in MYSQL_TIME structure.

  SYNOPSIS
    read_binary_{date,time,datetime}()
    tm    MYSQL_TIME structure to fill
    pos   pointer to current position in network buffer.
          These functions increase pos to point to the beginning of the
          next column.

  Auxiliary functions to read time (date, datetime) values from network
  buffer and store in MYSQL_TIME structure. Jointly used by conversion
  and no-conversion fetching.
*/

static void read_binary_time(MYSQL_TIME *tm, uchar **pos)
{
  /* net_field_length will set pos to the first byte of data */
  uint length= net_field_length(pos);

  if (length)
  {
    uchar *to= *pos;
    tm->neg= (bool) to[0];

    tm->day=    (ulong) sint4korr(to+1);
    tm->hour=   (uint) to[5];
    tm->minute= (uint) to[6];
    tm->second= (uint) to[7];
    tm->second_part= (length > 8) ? (ulong) sint4korr(to+8) : 0;
    tm->year= tm->month= 0;
    if (tm->day)
    {
      /* Convert days to hours at once */
      tm->hour+= tm->day*24;
      tm->day= 0;
    }
    tm->time_type= MYSQL_TIMESTAMP_TIME;

    *pos+= length;
  }
  else
    set_zero_time(tm, MYSQL_TIMESTAMP_TIME);
}

static void read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
{
  uint length= net_field_length(pos);

  if (length)
  {
    uchar *to= *pos;

    tm->neg=    0;
    tm->year=   (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day=    (uint) to[3];

    if (length > 4)
    {
      tm->hour=   (uint) to[4];
      tm->minute= (uint) to[5];
      tm->second= (uint) to[6];
    }
    else
      tm->hour= tm->minute= tm->second= 0;
    tm->second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
    tm->time_type= MYSQL_TIMESTAMP_DATETIME;

    *pos+= length;
  }
  else
    set_zero_time(tm, MYSQL_TIMESTAMP_DATETIME);
}

static void read_binary_date(MYSQL_TIME *tm, uchar **pos)
{
  uint length= net_field_length(pos);

  if (length)
  {
    uchar *to= *pos;
    tm->year =  (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day= (uint) to[3];

    tm->hour= tm->minute= tm->second= 0;
    tm->second_part= 0;
    tm->neg= 0;
    tm->time_type= MYSQL_TIMESTAMP_DATE;

    *pos+= length;
  }
  else
    set_zero_time(tm, MYSQL_TIMESTAMP_DATE);
}


/*
  Convert string to supplied buffer of any type.

  SYNOPSIS
    fetch_string_with_conversion()
    param   output buffer descriptor
    value   column data
    length  data length
*/

static void fetch_string_with_conversion(MYSQL_BIND *param, char *value,
                                         uint length)
{
  char *buffer= (char *)param->buffer;
  int err= 0;

  /*
    This function should support all target buffer types: the rest
    of conversion functions can delegate conversion to it.
  */
  switch(param->buffer_type) {
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
  case MYSQL_TYPE_TINY:
  {
    uchar data= (uchar) my_strntol(&my_charset_latin1, value, length, 10,
                                   NULL, &err);
    *buffer= data;
    break;
  }
  case MYSQL_TYPE_SHORT:
  {
    short data= (short) my_strntol(&my_charset_latin1, value, length, 10,
                                   NULL, &err);
    shortstore(buffer, data);
    break;
  }
  case MYSQL_TYPE_LONG:
  {
    int32 data= (int32)my_strntol(&my_charset_latin1, value, length, 10,
                                  NULL, &err);
    longstore(buffer, data);
    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong data= my_strntoll(&my_charset_latin1, value, length, 10,
                               NULL, &err);
    longlongstore(buffer, data);
    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
    float data = (float) my_strntod(&my_charset_latin1, value, length,
                                    NULL, &err);
    floatstore(buffer, data);
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
    double data= my_strntod(&my_charset_latin1, value, length, NULL, &err);
    doublestore(buffer, data);
    break;
  }
  case MYSQL_TYPE_TIME:
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
    str_to_time(value, length, tm, &err);
    break;
  }
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
    str_to_datetime(value, length, tm, 0, &err);
    break;
  }
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  default:
  {
    /*
      Copy column data to the buffer taking into account offset,
      data length and buffer length.
    */
    char *start= value + param->offset;
    char *end= value + length;
    ulong copy_length;
    if (start < end)
    {
      copy_length= end - start;
      /* We've got some data beyond offset: copy up to buffer_length bytes */
      if (param->buffer_length)
        memcpy(buffer, start, min(copy_length, param->buffer_length));
    }
    else
      copy_length= 0;
    if (copy_length < param->buffer_length)
      buffer[copy_length]= '\0';
    /*
      param->length will always contain length of entire column;
      number of copied bytes may be way different:
    */
    *param->length= length;
    break;
  }
  }
}


/*
  Convert integer value to client buffer of any type.

  SYNOPSIS
    fetch_long_with_conversion()
    param   output buffer descriptor
    field   column metadata
    value   column data
*/

static void fetch_long_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                       longlong value)
{
  char *buffer= (char *)param->buffer;
  uint field_is_unsigned= field->flags & UNSIGNED_FLAG;

  switch (param->buffer_type) {
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
  case MYSQL_TYPE_TINY:
    *(uchar *)param->buffer= (uchar) value;
    break;
  case MYSQL_TYPE_SHORT:
    shortstore(buffer, value);
    break;
  case MYSQL_TYPE_LONG:
    longstore(buffer, value);
    break;
  case MYSQL_TYPE_LONGLONG:
    longlongstore(buffer, value);
    break;
  case MYSQL_TYPE_FLOAT:
  {
    float data= field_is_unsigned ? (float) ulonglong2double(value) :
                                    (float) value;
    floatstore(buffer, data);
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
    double data= field_is_unsigned ? ulonglong2double(value) :
                                     (double) value;
    doublestore(buffer, data);
    break;
  }
  default:
  {
    char buff[22];                              /* Enough for longlong */
    char *end= longlong10_to_str(value, buff, field_is_unsigned ? 10: -10);
    /* Resort to string conversion which supports all typecodes */
    uint length= (uint) (end-buff);

    if (field->flags & ZEROFILL_FLAG && length < field->length &&
        field->length < 21)
    {
      bmove_upp((char*) buff+field->length,buff+length, length);
      bfill((char*) buff, field->length - length,'0');
      length= field->length;
    }
    fetch_string_with_conversion(param, buff, length);
    break;
  }
  }
}


/*
  Convert double/float column to supplied buffer of any type.

  SYNOPSIS
    fetch_float_with_conversion()
    param   output buffer descriptor
    field   column metadata
    value   column data
    width   default number of significant digits used when converting
            float/double to string
*/

static void fetch_float_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                        double value, int width)
{
  char *buffer= (char *)param->buffer;

  switch (param->buffer_type) {
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
  case MYSQL_TYPE_TINY:
    *buffer= (uchar)value;
    break;
  case MYSQL_TYPE_SHORT:
    shortstore(buffer, (short)value);
    break;
  case MYSQL_TYPE_LONG:
    longstore(buffer, (long)value);
    break;
  case MYSQL_TYPE_LONGLONG:
  {
    longlong val= (longlong) value;
    longlongstore(buffer, val);
    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
    float data= (float) value;
    floatstore(buffer, data);
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
    doublestore(buffer, value);
    break;
  }
  default:
  {
    /*
      Resort to fetch_string_with_conversion: this should handle
      floating point -> string conversion nicely, honor all typecodes
      and param->offset possibly set in mysql_stmt_fetch_column
    */
    char buff[MAX_DOUBLE_STRING_REP_LENGTH];
    char *end;
    /* TODO: move this to a header shared between client and server. */
#define NOT_FIXED_DEC  31
    if (field->decimals >= NOT_FIXED_DEC)
#undef NOT_FIXED_DEC
    {
      /*
        The 14 below is to ensure that the server and client has the same
        precisions. This will ensure that on the same machine you get the
        same value as a string independent of the protocol you use.
      */
      sprintf(buff, "%-*.*g", (int) min(sizeof(buff)-1,
                                        param->buffer_length),
	      min(14,width), value);
      end= strcend(buff, ' ');
      *end= 0;
    }
    else
    {
      sprintf(buff, "%.*f", (int) field->decimals, value);
      end= strend(buff);
    }
    fetch_string_with_conversion(param, buff, (uint) (end - buff));
    break;
  }
  }
}


/*
  Fetch time/date/datetime to supplied buffer of any type

  SYNOPSIS
    param   output buffer descriptor
    time    column data
*/

static void fetch_datetime_with_conversion(MYSQL_BIND *param,
                                           MYSQL_TIME *time)
{
  switch (param->buffer_type) {
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
    /* XXX: should we copy only relevant members here? */
    *(MYSQL_TIME *)(param->buffer)= *time;
    break;
  default:
  {
    /*
      Convert time value  to string and delegate the rest to
      fetch_string_with_conversion:
    */
    char buff[MAX_DATE_STRING_REP_LENGTH];
    uint length= my_TIME_to_str(time, buff);
    /* Resort to string conversion */
    fetch_string_with_conversion(param, (char *)buff, length);
    break;
  }
  }
}


/*
  Fetch and convert result set column to output buffer.

  SYNOPSIS
    fetch_result_with_conversion()
    param   output buffer descriptor
    field   column metadata
    row     points to a column of result set tuple in binary format

  DESCRIPTION
    This is a fallback implementation of column fetch used
    if column and output buffer types do not match.
    Increases tuple pointer to point at the next column within the
    tuple.
*/

static void fetch_result_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                         uchar **row)
{
  enum enum_field_types field_type= field->type;
  uint field_is_unsigned= field->flags & UNSIGNED_FLAG;

  switch (field_type) {
  case MYSQL_TYPE_TINY:
  {
    uchar value= **row;
    /* sic: we need to cast to 'signed char' as 'char' may be unsigned */
    longlong data= field_is_unsigned ? (longlong) value :
                                       (longlong) (signed char) value;
    fetch_long_with_conversion(param, field, data);
    *row+= 1;
    break;
  }
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_YEAR:
  {
    short value= sint2korr(*row);
    longlong data= field_is_unsigned ? (longlong) (unsigned short) value :
                                       (longlong) value;
    fetch_long_with_conversion(param, field, data);
    *row+= 2;
    break;
  }
  case MYSQL_TYPE_INT24: /* mediumint is sent as 4 bytes int */
  case MYSQL_TYPE_LONG:
  {
    int32 value= sint4korr(*row);
    longlong data= field_is_unsigned ? (longlong) (uint32) value :
                                       (longlong) value;
    fetch_long_with_conversion(param, field, data);
    *row+= 4;
    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong value= (longlong)sint8korr(*row);
    fetch_long_with_conversion(param, field, value);
    *row+= 8;
    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
    float value;
    float4get(value,*row);
    fetch_float_with_conversion(param, field, value, FLT_DIG);
    *row+= 4;
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
    double value;
    float8get(value,*row);
    fetch_float_with_conversion(param, field, value, DBL_DIG);
    *row+= 8;
    break;
  }
  case MYSQL_TYPE_DATE:
  {
    MYSQL_TIME tm;

    read_binary_date(&tm, row);
    fetch_datetime_with_conversion(param, &tm);
    break;
  }
  case MYSQL_TYPE_TIME:
  {
    MYSQL_TIME tm;

    read_binary_time(&tm, row);
    fetch_datetime_with_conversion(param, &tm);
    break;
  }
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
  {
    MYSQL_TIME tm;

    read_binary_datetime(&tm, row);
    fetch_datetime_with_conversion(param, &tm);
    break;
  }
  default:
  {
    ulong length= net_field_length(row);
    fetch_string_with_conversion(param, (char*) *row, length);
    *row+= length;
    break;
  }
  }
}


/*
  Functions to fetch data to application buffers without conversion.

  All functions have the following characteristics:

  SYNOPSIS
    fetch_result_xxx()
    param   MySQL bind param
    pos     Row value

  DESCRIPTION
    These are no-conversion functions, used in binary protocol to store
    rows in application buffers. A function used only if type of binary data
    is compatible with type of application buffer.

  RETURN
    none
*/

static void fetch_result_tinyint(MYSQL_BIND *param, uchar **row)
{
  *(uchar *)param->buffer= **row;
  (*row)++;
}

static void fetch_result_short(MYSQL_BIND *param, uchar **row)
{
  short value = (short)sint2korr(*row);
  shortstore(param->buffer, value);
  *row+= 2;
}

static void fetch_result_int32(MYSQL_BIND *param, uchar **row)
{
  int32 value= (int32)sint4korr(*row);
  longstore(param->buffer, value);
  *row+= 4;
}

static void fetch_result_int64(MYSQL_BIND *param, uchar **row)
{
  longlong value= (longlong)sint8korr(*row);
  longlongstore(param->buffer, value);
  *row+= 8;
}

static void fetch_result_float(MYSQL_BIND *param, uchar **row)
{
  float value;
  float4get(value,*row);
  floatstore(param->buffer, value);
  *row+= 4;
}

static void fetch_result_double(MYSQL_BIND *param, uchar **row)
{
  double value;
  float8get(value,*row);
  doublestore(param->buffer, value);
  *row+= 8;
}

static void fetch_result_time(MYSQL_BIND *param, uchar **row)
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
  read_binary_time(tm, row);
}

static void fetch_result_date(MYSQL_BIND *param, uchar **row)
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
  read_binary_date(tm, row);
}

static void fetch_result_datetime(MYSQL_BIND *param, uchar **row)
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
  read_binary_datetime(tm, row);
}

static void fetch_result_bin(MYSQL_BIND *param, uchar **row)
{
  ulong length= net_field_length(row);
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
  *param->length= length;
  *row+= length;
}

static void fetch_result_str(MYSQL_BIND *param, uchar **row)
{
  ulong length= net_field_length(row);
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
  /* Add an end null if there is room in the buffer */
  if (copy_length != param->buffer_length)
    ((uchar *)param->buffer)[copy_length]= '\0';
  *param->length= length;			/* return total length */
  *row+= length;
}


/*
  functions to calculate max lengths for strings during
  mysql_stmt_store_result()
*/

static void skip_result_fixed(MYSQL_BIND *param,
			      MYSQL_FIELD *field __attribute__((unused)),
			      uchar **row)

{
  (*row)+= param->pack_length;
}


static void skip_result_with_length(MYSQL_BIND *param __attribute__((unused)),
				    MYSQL_FIELD *field __attribute__((unused)),
				    uchar **row)

{
  ulong length= net_field_length(row);
  (*row)+= length;
}


static void skip_result_string(MYSQL_BIND *param __attribute__((unused)),
			       MYSQL_FIELD *field,
			       uchar **row)

{
  ulong length= net_field_length(row);
  (*row)+= length;
  if (field->max_length < length)
    field->max_length= length;
}


/*
  Setup the bind buffers for resultset processing
*/

my_bool STDCALL mysql_stmt_bind_result(MYSQL_STMT *stmt, MYSQL_BIND *bind)
{
  MYSQL_BIND *param, *end;
  MYSQL_FIELD *field;
  ulong       bind_count= stmt->field_count;
  uint        param_count= 0;
  DBUG_ENTER("mysql_stmt_bind_result");
  DBUG_PRINT("enter",("field_count: %d", bind_count));

  if (!bind_count)
  {
    if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
    {
      set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
    }
    DBUG_RETURN(0);
  }

  /*
    We only need to check that stmt->field_count - if it is not null
    stmt->bind was initialized in mysql_stmt_prepare
   */

  memcpy((char*) stmt->bind, (char*) bind, sizeof(MYSQL_BIND) * bind_count);

  for (param= stmt->bind, end= param + bind_count, field= stmt->fields ;
       param < end ;
       param++, field++)
  {
    DBUG_PRINT("info",("buffer_type: %u  field_type: %u",
                       (uint) param->buffer_type, (uint) field->type));
    /*
      Set param->is_null to point to a dummy variable if it's not set.
      This is to make the execute code easier
    */
    if (!param->is_null)
      param->is_null= &param->internal_is_null;

    if (!param->length)
      param->length= &param->internal_length;

    param->param_number= param_count++;
    param->offset= 0;

    /* Setup data copy functions for the different supported types */
    switch (param->buffer_type) {
    case MYSQL_TYPE_NULL: /* for dummy binds */
      *param->length= 0;
      break;
    case MYSQL_TYPE_TINY:
      param->fetch_result= fetch_result_tinyint;
      *param->length= 1;
      break;
    case MYSQL_TYPE_SHORT:
    case MYSQL_TYPE_YEAR:
      param->fetch_result= fetch_result_short;
      *param->length= 2;
      break;
    case MYSQL_TYPE_INT24:
    case MYSQL_TYPE_LONG:
      param->fetch_result= fetch_result_int32;
      *param->length= 4;
      break;
    case MYSQL_TYPE_LONGLONG:
      param->fetch_result= fetch_result_int64;
      *param->length= 8;
      break;
    case MYSQL_TYPE_FLOAT:
      param->fetch_result= fetch_result_float;
      *param->length= 4;
      break;
    case MYSQL_TYPE_DOUBLE:
      param->fetch_result= fetch_result_double;
      *param->length= 8;
      break;
    case MYSQL_TYPE_TIME:
      param->fetch_result= fetch_result_time;
      *param->length= sizeof(MYSQL_TIME);
      break;
    case MYSQL_TYPE_DATE:
      param->fetch_result= fetch_result_date;
      *param->length= sizeof(MYSQL_TIME);
      break;
    case MYSQL_TYPE_DATETIME:
    case MYSQL_TYPE_TIMESTAMP:
      param->fetch_result= fetch_result_datetime;
      *param->length= sizeof(MYSQL_TIME);
      break;
    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
    case MYSQL_TYPE_BLOB:
      DBUG_ASSERT(param->buffer_length != 0);
      param->fetch_result= fetch_result_bin;
      break;
    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
      DBUG_ASSERT(param->buffer_length != 0);
      param->fetch_result= fetch_result_str;
      break;
    default:
      strmov(stmt->sqlstate, unknown_sqlstate);
      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
	      param->buffer_type, param_count);
      DBUG_RETURN(1);
    }

    /* Setup skip_result functions (to calculate max_length) */
    param->skip_result= skip_result_fixed;
    switch (field->type) {
    case MYSQL_TYPE_NULL: /* for dummy binds */
      param->pack_length= 0;
      field->max_length= 0;
      break;
    case MYSQL_TYPE_TINY:
      param->pack_length= 1;
      field->max_length= 4;                     /* as in '-127' */
      break;
    case MYSQL_TYPE_YEAR:
    case MYSQL_TYPE_SHORT:
      param->pack_length= 2;
      field->max_length= 6;                     /* as in '-32767' */
      break;
    case MYSQL_TYPE_INT24:
      field->max_length= 9;  /* as in '16777216' or in '-8388607' */
      param->pack_length= 4;
      break;
    case MYSQL_TYPE_LONG:
      field->max_length= 11;                    /* '-2147483647' */
      param->pack_length= 4;
      break;
    case MYSQL_TYPE_LONGLONG:
      field->max_length= 21;                    /* '18446744073709551616' */
      param->pack_length= 8;
      break;
    case MYSQL_TYPE_FLOAT:
      param->pack_length= 4;
      field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
      break;
    case MYSQL_TYPE_DOUBLE:
      param->pack_length= 8;
      field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
      break;
    case MYSQL_TYPE_TIME:
    case MYSQL_TYPE_DATE:
    case MYSQL_TYPE_DATETIME:
    case MYSQL_TYPE_TIMESTAMP:
      param->skip_result= skip_result_with_length;
      field->max_length= MAX_DATE_STRING_REP_LENGTH;
      break;
    case MYSQL_TYPE_DECIMAL:
    case MYSQL_TYPE_ENUM:
    case MYSQL_TYPE_SET:
    case MYSQL_TYPE_GEOMETRY:
    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
    case MYSQL_TYPE_BLOB:
    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
      param->skip_result= skip_result_string;
      break;
    default:
      strmov(stmt->sqlstate, unknown_sqlstate);
      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
	      field->type, param_count);
      DBUG_RETURN(1);
    }
  }
  stmt->bind_result_done= TRUE;
  DBUG_RETURN(0);
}


/*
  Fetch row data to bind buffers
*/

static int stmt_fetch_row(MYSQL_STMT *stmt, uchar *row)
{
  MYSQL_BIND  *bind, *end;
  MYSQL_FIELD *field;
  uchar *null_ptr, bit;
  /*
    Precondition: if stmt->field_count is zero or row is NULL, read_row_*
    function must return no data.
  */
  DBUG_ASSERT(stmt->field_count);
  DBUG_ASSERT(row);

  if (!stmt->bind_result_done)
  {
    /* If output parameters were not bound we should just return success */
    return 0;
  }

  null_ptr= row;
  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */

  /* Copy complete row to application buffers */
  for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
       bind < end ;
       bind++, field++)
  {
    if (*null_ptr & bit)
    {
      /*
        We should set both inter_buffer and is_null to be able to see
        nulls in mysql_stmt_fetch_column. This is because is_null may point
        to user data which can be overwritten between mysql_stmt_fetch and
        mysql_stmt_fetch_column, and in this case nullness of column will be
        lost. See mysql_stmt_fetch_column for details.
      */
      bind->inter_buffer= NULL;
      *bind->is_null= 1;
    }
    else
    {
      *bind->is_null= 0;
      bind->inter_buffer= row;
      if (field->type == bind->buffer_type)
        (*bind->fetch_result)(bind, &row);
      else
        fetch_result_with_conversion(bind, field, &row);
    }
    if (!((bit<<=1) & 255))
    {
      bit= 1;					/* To next byte */
      null_ptr++;
    }
  }
  return 0;
}


int cli_unbuffered_fetch(MYSQL *mysql, char **row)
{
  if (packet_error == net_safe_read(mysql))
    return 1;

  *row= ((mysql->net.read_pos[0] == 254) ? NULL :
	 (char*) (mysql->net.read_pos+1));
  return 0;
}


/*
  Fetch and return row data to bound buffers, if any
*/

int STDCALL mysql_stmt_fetch(MYSQL_STMT *stmt)
{
  int rc;
  uchar *row;
  DBUG_ENTER("mysql_stmt_fetch");

  if ((rc= (*stmt->read_row_func)(stmt, &row)) ||
      (rc= stmt_fetch_row(stmt, row)))
  {
    stmt->state= MYSQL_STMT_PREPARE_DONE;       /* XXX: this is buggy */
    stmt->read_row_func= stmt_read_row_no_data;
  }
  else
  {
    /* This is to know in mysql_stmt_fetch_column that data was fetched */
    stmt->state= MYSQL_STMT_FETCH_DONE;
  }
  DBUG_RETURN(rc);
}


/*
  Fetch data for one specified column data

  SYNOPSIS
    mysql_stmt_fetch_column()
    stmt		Prepared statement handler
    bind		Where data should be placed. Should be filled in as
			when calling mysql_stmt_bind_result()
    column		Column to fetch (first column is 0)
    ulong offset	Offset in result data (to fetch blob in pieces)
			This is normally 0
  RETURN
    0	ok
    1	error
*/

int STDCALL mysql_stmt_fetch_column(MYSQL_STMT *stmt, MYSQL_BIND *bind,
                                    uint column, ulong offset)
{
  MYSQL_BIND *param= stmt->bind+column;
  DBUG_ENTER("mysql_stmt_fetch_column");

  if ((int) stmt->state < (int) MYSQL_STMT_FETCH_DONE)
  {
    set_stmt_error(stmt, CR_NO_DATA, unknown_sqlstate);
    return 1;
  }
  if (column >= stmt->field_count)
  {
    set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
    DBUG_RETURN(1);
  }

  if (param->inter_buffer)
  {
    MYSQL_FIELD *field= stmt->fields+column;
    uchar *row= param->inter_buffer;
    bind->offset= offset;
    if (bind->is_null)
      *bind->is_null= 0;
    if (bind->length) /* Set the length if non char/binary types */
      *bind->length= *param->length;
    else
      bind->length= &param->internal_length;	/* Needed for fetch_result() */
    fetch_result_with_conversion(bind, field, &row);
  }
  else
  {
    if (bind->is_null)
      *bind->is_null= 1;
  }
  DBUG_RETURN(0);
}


/*
  Read all rows of data from server  (binary format)
*/

int cli_read_binary_rows(MYSQL_STMT *stmt)
{
  ulong      pkt_len;
  uchar      *cp;
  MYSQL      *mysql= stmt->mysql;
  MYSQL_DATA *result= &stmt->result;
  MYSQL_ROWS *cur, **prev_ptr= &result->data;
  NET        *net = &mysql->net;
  DBUG_ENTER("cli_read_binary_rows");

  mysql= mysql->last_used_con;

  while ((pkt_len= net_safe_read(mysql)) != packet_error)
  {
    cp= net->read_pos;
    if (cp[0] != 254 || pkt_len >= 8)
    {
      if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,
                                          sizeof(MYSQL_ROWS) + pkt_len - 1)))
      {
        set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
        goto err;
      }
      cur->data= (MYSQL_ROW) (cur+1);
      *prev_ptr= cur;
      prev_ptr= &cur->next;
      memcpy((char *) cur->data, (char *) cp+1, pkt_len-1);
      cur->length= pkt_len;		/* To allow us to do sanity checks */
      result->rows++;
    }
    else
    {
      /* end of data */
      *prev_ptr= 0;
      mysql->warning_count= uint2korr(cp+1);
      mysql->server_status= uint2korr(cp+3);
      DBUG_PRINT("info",("status: %u  warning_count: %u",
                         mysql->server_status, mysql->warning_count));
      DBUG_RETURN(0);
    }
  }
  set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);

err:
  DBUG_RETURN(1);
}


/*
  Update meta data for statement

  SYNOPSIS
    stmt_update_metadata()
    stmt			Statement handler
    row				Binary data

  NOTES
    Only updates MYSQL_FIELD->max_length for strings
*/

static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data)
{
  MYSQL_BIND  *bind, *end;
  MYSQL_FIELD *field;
  uchar *null_ptr, bit;
  uchar *row= (uchar*) data->data;
#ifndef DBUG_OFF
  uchar *row_end= row + data->length;
#endif

  null_ptr= row;
  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */

  /* Go throw all fields and calculate metadata */
  for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
       bind < end ;
       bind++, field++)
  {
    if (!(*null_ptr & bit))
      (*bind->skip_result)(bind, field, &row);
    DBUG_ASSERT(row <= row_end);
    if (!((bit<<=1) & 255))
    {
      bit= 1;					/* To next byte */
      null_ptr++;
    }
  }
}


/*
  Store or buffer the binary results to stmt
*/

int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
{
  MYSQL *mysql= stmt->mysql;
  MYSQL_DATA *result= &stmt->result;
  DBUG_ENTER("mysql_stmt_store_result");

  mysql= mysql->last_used_con;

  if (!stmt->field_count)
    DBUG_RETURN(0);
  if ((int) stmt->state < (int) MYSQL_STMT_EXECUTE_DONE ||
      mysql->status != MYSQL_STATUS_GET_RESULT)
  {
    set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
    DBUG_RETURN(1);
  }
  if (result->data)
  {
    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
    stmt->data_cursor= NULL;
  }

  if (stmt->update_max_length && !stmt->bind_result_done)
  {
    /*
      We must initalize the bind structure to be able to calculate
      max_length
    */
    MYSQL_BIND  *bind, *end;
    MYSQL_FIELD *field;
    bzero((char*) stmt->bind, sizeof(*stmt->bind)* stmt->field_count);

    for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields;
	 bind < end ;
	 bind++, field++)
    {
      bind->buffer_type= MYSQL_TYPE_NULL;
      bind->buffer_length=1;
    }

    if (mysql_stmt_bind_result(stmt, stmt->bind))
      DBUG_RETURN(1);
    stmt->bind_result_done= 0;			/* No normal bind done */
  }

  if ((*mysql->methods->read_binary_rows)(stmt))
  {
    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
    mysql->status= MYSQL_STATUS_READY;
    DBUG_RETURN(1);
  }

  if (stmt->update_max_length)
  {
    MYSQL_ROWS *cur= result->data;
    for(; cur; cur=cur->next)
      stmt_update_metadata(stmt, cur);
  }

  stmt->data_cursor= result->data;
  mysql->affected_rows= stmt->affected_rows= result->rows;
  stmt->read_row_func= stmt_read_row_buffered;
  mysql->unbuffered_fetch_owner= 0;             /* set in stmt_execute */
  mysql->status= MYSQL_STATUS_READY;		/* server is ready */
  DBUG_RETURN(0); /* Data buffered, must be fetched with mysql_stmt_fetch() */
}


/*
  Seek to desired row in the statement result set
*/

MYSQL_ROW_OFFSET STDCALL
mysql_stmt_row_seek(MYSQL_STMT *stmt, MYSQL_ROW_OFFSET row)
{
  MYSQL_ROW_OFFSET offset= stmt->data_cursor;
  DBUG_ENTER("mysql_stmt_row_seek");

  stmt->data_cursor= row;
  DBUG_RETURN(offset);
}


/*
  Return the current statement row cursor position
*/

MYSQL_ROW_OFFSET STDCALL
mysql_stmt_row_tell(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_row_tell");

  DBUG_RETURN(stmt->data_cursor);
}


/*
  Move the stmt result set data cursor to specified row
*/

void STDCALL
mysql_stmt_data_seek(MYSQL_STMT *stmt, my_ulonglong row)
{
  MYSQL_ROWS *tmp= stmt->result.data;
  DBUG_ENTER("mysql_stmt_data_seek");
  DBUG_PRINT("enter",("row id to seek: %ld",(long) row));

  for (; tmp && row; --row, tmp= tmp->next)
    ;
  stmt->data_cursor= tmp;
  if (!row && tmp)
  {
       /*  Rewind the counter */
    stmt->read_row_func= stmt_read_row_buffered;
    stmt->state= MYSQL_STMT_EXECUTE_DONE;
  }
  DBUG_VOID_RETURN;
}


/*
  Return total rows the current statement result set
*/

my_ulonglong STDCALL mysql_stmt_num_rows(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_num_rows");

  DBUG_RETURN(stmt->result.rows);
}

my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt)
{
  MYSQL_DATA *result= &stmt->result;
  DBUG_ENTER("mysql_stmt_free_result");

  DBUG_ASSERT(stmt != 0);

  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    MYSQL *mysql= stmt->mysql;

    if (result->data)
    {
      /* Result buffered */
      free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
      result->data= NULL;
      result->rows= 0;
      stmt->data_cursor= NULL;
    }

    if (mysql && stmt->field_count &&
        (int) stmt->state > (int) MYSQL_STMT_PREPARE_DONE)
    {
      if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
        mysql->unbuffered_fetch_owner= 0;
      if (mysql->status != MYSQL_STATUS_READY)
      {
        /* There is a result set and it belongs to this statement */
        (*mysql->methods->flush_use_result)(mysql);
        mysql->status= MYSQL_STATUS_READY;
      }
    }
    stmt->state= MYSQL_STMT_PREPARE_DONE;
    stmt->read_row_func= stmt_read_row_no_data;
  }
  DBUG_RETURN(0);
}

/********************************************************************
 statement error handling and close
*********************************************************************/

/*
  Close the statement handle by freeing all alloced resources

  SYNOPSIS
    mysql_stmt_close()
    stmt	       Statement handle

  RETURN VALUES
    0	ok
    1	error
*/

my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
{
  MYSQL *mysql= stmt->mysql;
  int rc= 0;
  DBUG_ENTER("mysql_stmt_close");

  free_root(&stmt->result.alloc, MYF(0));
  free_root(&stmt->mem_root, MYF(0));

  if (mysql)
  {
    mysql->stmts= list_delete(mysql->stmts, &stmt->list);
    if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
    {
      char buff[MYSQL_STMT_HEADER];             /* 4 bytes - stmt id */

      if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
        mysql->unbuffered_fetch_owner= 0;
      if (mysql->status != MYSQL_STATUS_READY)
      {
        /*
          Flush result set of the connection. If it does not belong
          to this statement, set a warning.
        */
        (*mysql->methods->flush_use_result)(mysql);
        if (mysql->unbuffered_fetch_owner)
          *mysql->unbuffered_fetch_owner= TRUE;
        mysql->status= MYSQL_STATUS_READY;
      }
      int4store(buff, stmt->stmt_id);
      if ((rc= simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1)))
      {
        set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                        mysql->net.sqlstate);
      }
    }
  }

  my_free((gptr) stmt, MYF(MY_WME));

  DBUG_RETURN(test(rc));
}

/*
  Reset the statement buffers in server
*/

my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
{
  char buff[MYSQL_STMT_HEADER]; /* packet header: 4 bytes for stmt id */
  MYSQL *mysql;
  MYSQL_BIND *param, *param_end;
  DBUG_ENTER("mysql_stmt_reset");
  DBUG_ASSERT(stmt != 0);

  /* If statement hasnt been prepared there is nothing to reset */
  if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
    DBUG_RETURN(0);

  mysql= stmt->mysql->last_used_con;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
  if ((*mysql->methods->advanced_command)(mysql, COM_RESET_STMT, buff,
                                          sizeof(buff), 0, 0, 0))
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
    DBUG_RETURN(1);
  }

  /* Clear long_data_used for next call (as we do in mysql_stmt_execute() */
  for (param= stmt->params, param_end= param + stmt->param_count;
       param < param_end;
       param++)
    param->long_data_used= 0;

  DBUG_RETURN(0);
}

/*
  Return statement error code
*/

uint STDCALL mysql_stmt_errno(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_errno");
  DBUG_RETURN(stmt->last_errno);
}

const char *STDCALL mysql_stmt_sqlstate(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_sqlstate");
  DBUG_RETURN(stmt->sqlstate);
}

/*
  Return statement error message
*/

const char *STDCALL mysql_stmt_error(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_error");
  DBUG_RETURN(stmt->last_error);
}


/********************************************************************
 Transactional APIs
*********************************************************************/

/*
  Commit the current transaction
*/

my_bool STDCALL mysql_commit(MYSQL * mysql)
{
  DBUG_ENTER("mysql_commit");
  DBUG_RETURN((my_bool) mysql_real_query(mysql, "commit", 6));
}

/*
  Rollback the current transaction
*/

my_bool STDCALL mysql_rollback(MYSQL * mysql)
{
  DBUG_ENTER("mysql_rollback");
  DBUG_RETURN((my_bool) mysql_real_query(mysql, "rollback", 8));
}


/*
  Set autocommit to either true or false
*/

my_bool STDCALL mysql_autocommit(MYSQL * mysql, my_bool auto_mode)
{
  DBUG_ENTER("mysql_autocommit");
  DBUG_PRINT("enter", ("mode : %d", auto_mode));

  if (auto_mode) /* set to true */
    DBUG_RETURN((my_bool) mysql_real_query(mysql, "set autocommit=1", 16));
  DBUG_RETURN((my_bool) mysql_real_query(mysql, "set autocommit=0", 16));
}


/********************************************************************
 Multi query execution + SPs APIs
*********************************************************************/

/*
  Returns true/false to indicate whether any more query results exist
  to be read using mysql_next_result()
*/

my_bool STDCALL mysql_more_results(MYSQL *mysql)
{
  my_bool res;
  DBUG_ENTER("mysql_more_results");

  res= ((mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS) ?
	1: 0);
  DBUG_PRINT("exit",("More results exists ? %d", res));
  DBUG_RETURN(res);
}


/*
  Reads and returns the next query results
*/
int STDCALL mysql_next_result(MYSQL *mysql)
{
  DBUG_ENTER("mysql_next_result");

  if (mysql->status != MYSQL_STATUS_READY)
  {
    strmov(mysql->net.sqlstate, unknown_sqlstate);
    strmov(mysql->net.last_error,
	   ER(mysql->net.last_errno=CR_COMMANDS_OUT_OF_SYNC));
    DBUG_RETURN(1);
  }

  mysql->net.last_error[0]= 0;
  mysql->net.last_errno= 0;
  strmov(mysql->net.sqlstate, not_error_sqlstate);
  mysql->affected_rows= ~(my_ulonglong) 0;

  if (mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS)
    DBUG_RETURN((*mysql->methods->next_result)(mysql));

  DBUG_RETURN(-1);				/* No more results */
}


MYSQL_RES * STDCALL mysql_use_result(MYSQL *mysql)
{
  return (*mysql->methods->use_result)(mysql);
}

my_bool STDCALL mysql_read_query_result(MYSQL *mysql)
{
  return (*mysql->methods->read_query_result)(mysql);
}