libmysql.c 85.1 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   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; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   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 */
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#include <my_global.h>
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#include <my_sys.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>
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#include <assert.h> /* for DBUG_ASSERT() */
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#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
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#include <select.h>
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#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
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#endif /* !defined(MSDOS) && !defined(__WIN__) */
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#ifdef HAVE_POLL
#include <sys/poll.h>
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#endif
#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
#if defined(THREAD) && !defined(__WIN__)
#include <my_pthread.h>				/* because of signal()	*/
#endif
#ifndef INADDR_NONE
#define INADDR_NONE	-1
#endif

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#include <sql_common.h>
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#include "client_settings.h"
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ulong 		net_buffer_length=8192;
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ulong		max_allowed_packet= 1024L*1024L*1024L;
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ulong		net_read_timeout=  CLIENT_NET_READ_TIMEOUT;
ulong		net_write_timeout= CLIENT_NET_WRITE_TIMEOUT;
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#ifdef EMBEDDED_LIBRARY
#undef net_flush
my_bool	net_flush(NET *net);
#endif

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#if defined(MSDOS) || defined(__WIN__)
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/* socket_errno is defined in my_global.h for all platforms */
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#define perror(A)
#else
#include <errno.h>
#define SOCKET_ERROR -1
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#endif /* __WIN__ */
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/*
  If allowed through some configuration, then this needs to
  be changed
*/
#define MAX_LONG_DATA_LENGTH 8192
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#define unsigned_field(A) ((A)->flags & UNSIGNED_FLAG)

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static void append_wild(char *to,char *end,const char *wild);
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sig_handler pipe_sig_handler(int sig);
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static ulong mysql_sub_escape_string(CHARSET_INFO *charset_info, char *to,
				     const char *from, ulong length);
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my_bool stmt_close(MYSQL_STMT *stmt, my_bool skip_list);
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static my_bool mysql_client_init= 0;
static my_bool org_my_init_done= 0;

void mysql_once_init(void)
{
  if (!mysql_client_init)
  {
    mysql_client_init=1;
    org_my_init_done=my_init_done;
    my_init();					/* Will init threads */
    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);
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#if defined(SIGPIPE) && !defined(__WIN__)
    (void) signal(SIGPIPE, SIG_IGN);
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#endif
  }
#ifdef THREAD
  else
    my_thread_init();         /* Init if new thread */
#endif
}

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#ifndef EMBEDDED_LIBRARY
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int STDCALL mysql_server_init(int argc __attribute__((unused)),
			      char **argv __attribute__((unused)),
			      char **groups __attribute__((unused)))
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{
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  mysql_once_init();
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  return 0;
}
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void STDCALL mysql_server_end()
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{
  /* If library called my_init(), free memory allocated by it */
  if (!org_my_init_done)
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  {
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    my_end(0);
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#ifndef THREAD
  /* Remove TRACING, if enabled by mysql_debug() */
    DBUG_POP();
#endif
  }
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  else
    mysql_thread_end();
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  mysql_client_init= org_my_init_done= 0;
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}
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#endif /*EMBEDDED_LIBRARY*/
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my_bool STDCALL mysql_thread_init()
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{
#ifdef THREAD
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  return my_thread_init();
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#else
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  return 0;
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#endif
}

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

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/*
  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.
*/
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static MYSQL* spawn_init(MYSQL* parent, const char* host,
			 unsigned int port,
			 const char* user,
			 const char* passwd);

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/*
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  Expand wildcard to a sql string
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*/

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;
  }
}


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

void STDCALL
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mysql_debug(const char *debug __attribute__((unused)))
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{
#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];
      strmov(strmov(buff,"libmysql: "),env);
      MessageBox((HWND) 0,"Debugging variable MYSQL_DEBUG used",buff,MB_OK);
    }
#endif
  }
#endif
}


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

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sig_handler
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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
}

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


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


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my_bool STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
				   unsigned long length)
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{
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  MYSQL* last_used_slave, *slave_to_use = 0;
  DBUG_ENTER("mysql_slave_send_query");
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  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,
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						    0,0,0,0))
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    DBUG_RETURN(1);
  DBUG_RETURN(simple_command(slave_to_use, COM_QUERY, q, length, 1));
}
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/* enable/disable parsing of all queries to decide
   if they go on master or slave */
void STDCALL mysql_enable_rpl_parse(MYSQL* mysql)
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{
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  mysql->options.rpl_parse = 1;
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}

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

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

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/*  enable/disable reads from master */
void STDCALL mysql_enable_reads_from_master(MYSQL* mysql)
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{
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  mysql->options.no_master_reads = 0;
}
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void STDCALL mysql_disable_reads_from_master(MYSQL* mysql)
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{
  mysql->options.no_master_reads = 1;
}

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

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/*
  We may get an error while doing replication internals.
  In this case, we add a special explanation to the original
  error
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*/
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static void expand_error(MYSQL* mysql, int error)
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{
  char tmp[MYSQL_ERRMSG_SIZE];
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  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);
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  mysql->net.last_errno = error;
}

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/*
  This function assumes we have just called SHOW SLAVE STATUS and have
  read the given result and row
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*/
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static my_bool get_master(MYSQL* mysql, MYSQL_RES* res, MYSQL_ROW row)
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{
  MYSQL* master;
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  DBUG_ENTER("get_master");
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  if (mysql_num_fields(res) < 3)
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    DBUG_RETURN(1); /* safety */
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  /* use the same username and password as the original connection */
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  if (!(master = spawn_init(mysql, row[0], atoi(row[2]), 0, 0)))
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    DBUG_RETURN(1);
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  mysql->master = master;
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  DBUG_RETURN(0);
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}

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/*
  Assuming we already know that mysql points to a master connection,
  retrieve all the slaves
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*/
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static my_bool get_slaves_from_master(MYSQL* mysql)
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{
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  MYSQL_RES* res = 0;
  MYSQL_ROW row;
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  my_bool error = 1;
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  int has_auth_info;
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  int port_ind;
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  DBUG_ENTER("get_slaves_from_master");
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  if (!mysql->net.vio && !mysql_real_connect(mysql,0,0,0,0,0,0,0))
  {
    expand_error(mysql, CR_PROBE_MASTER_CONNECT);
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    DBUG_RETURN(1);
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  }

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

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

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

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

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    if (!(slave = spawn_init(mysql, row[1], atoi(row[port_ind]),
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			     tmp_user, tmp_pass)))
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      goto err;
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    /* Now add slave into the circular linked list */
    slave->next_slave = mysql->next_slave;
    mysql->next_slave = slave;
  }
  error = 0;
err:
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  if (res)
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    mysql_free_result(res);
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  DBUG_RETURN(error);
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}

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

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  /*
    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
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    a non-empty master host. However, it is more reliable to check
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    for empty master than whether the slave thread is actually running
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  */
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  if (mysql_query(mysql, "SHOW SLAVE STATUS") ||
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      !(res = mysql_store_result(mysql)))
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  {
    expand_error(mysql, CR_PROBE_SLAVE_STATUS);
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    DBUG_RETURN(1);
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  }
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  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]))
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  {
    /* this is a slave, ask it for the master */
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    if (get_master(mysql, res, row) || get_slaves_from_master(mysql))
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      goto err;
  }
  else
  {
    mysql->master = mysql;
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    if (get_slaves_from_master(mysql))
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      goto err;
  }

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


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/*
  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
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*/
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enum mysql_rpl_type
STDCALL mysql_rpl_query_type(const char* q, int len)
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{
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  const char *q_end= q + len;
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  for (; q < q_end; ++q)
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  {
    char c;
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    if (my_isalpha(&my_charset_latin1, (c= *q)))
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    {
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      switch (my_tolower(&my_charset_latin1,c)) {
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      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 */
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	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
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	  MYSQL_RPL_MASTER;
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      case 's': /* select or show */
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	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
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	  MYSQL_RPL_SLAVE;
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      case 'f': /* flush */
      case 'r': /* repair */
      case 'g': /* grant */
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	return MYSQL_RPL_ADMIN;
      default:
	return MYSQL_RPL_SLAVE;
      }
    }
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  }
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  return MYSQL_RPL_MASTER;		/* By default, send to master */
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}


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/**************************************************************************
  Connect to sql server
  If host == 0 then use localhost
**************************************************************************/
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#ifdef USE_OLD_FUNCTIONS
MYSQL * STDCALL
mysql_connect(MYSQL *mysql,const char *host,
	      const char *user, const char *passwd)
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{
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  MYSQL *res;
  mysql=mysql_init(mysql);			/* Make it thread safe */
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  {
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    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);
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  }
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}
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#endif
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/**************************************************************************
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  Change user and database
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**************************************************************************/

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my_bool	STDCALL mysql_change_user(MYSQL *mysql, const char *user,
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				  const char *passwd, const char *db)
{
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  char buff[512],*end=buff;
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  NET *net= &mysql->net;
  ulong pkt_length;
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  DBUG_ENTER("mysql_change_user");

  if (!user)
    user="";
  if (!passwd)
    passwd="";
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  /* Store user into the buffer */
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  end=strmov(end,user)+1;
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  /* write scrambled password according to server capabilities */
  if (passwd[0])
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  {
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    if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
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    {
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      *end++= SCRAMBLE_LENGTH;
      scramble(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH;
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    }
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    else
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    {
      scramble_323(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH_323 + 1;
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    }
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  }
  else
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    *end++= '\0';                               /* empty password */
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  /* Add database if needed */
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  end= strmov(end, db ? db : "") + 1;
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  /* Write authentication package */
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  simple_command(mysql,COM_CHANGE_USER, buff,(ulong) (end-buff),1);
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  pkt_length= net_safe_read(mysql);
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  if (pkt_length == packet_error)
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    goto error;
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  if (pkt_length == 1 && net->read_pos[0] == 254 &&
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      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.
    */
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    scramble_323(buff, mysql->scramble, passwd);
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    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));
      goto error;
    }
    /* Read what server thinks about out new auth message report */
    if (net_safe_read(mysql) == packet_error)
      goto error;
  }

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  /* Free old connect information */
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  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));

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  /* alloc new connect information */
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  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(0);
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error:
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  DBUG_RETURN(1);
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}

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

#if defined(__NETWARE__)
/* default to "root" on NetWare */
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 send_file_to_server(MYSQL *mysql, const char *filename)
{
  int fd, readcount;
  my_bool result= 1;
  uint packet_length=MY_ALIGN(mysql->net.max_packet-16,IO_SIZE);
  char *buf, tmp_name[FN_REFLEN];
  NET *net= &mysql->net;
  DBUG_ENTER("send_file_to_server");

  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);
  }

  fn_format(tmp_name,filename,"","",4);		/* Convert to client format */
  if ((fd = my_open(tmp_name,O_RDONLY, MYF(0))) < 0)
  {
    my_net_write(net,"",0);		/* Server needs one packet */
    net_flush(net);
    strmov(net->sqlstate, unknown_sqlstate);
    net->last_errno=EE_FILENOTFOUND;
    my_snprintf(net->last_error,sizeof(net->last_error)-1,
		EE(net->last_errno),tmp_name, errno);
    goto err;
  }

  while ((readcount = (int) my_read(fd,(byte*) buf,packet_length,MYF(0))) > 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)
  {
    strmov(net->sqlstate, unknown_sqlstate);
    net->last_errno=EE_READ; /* the errmsg for not entire file read */
    my_snprintf(net->last_error,sizeof(net->last_error)-1,
		tmp_name,errno);
    goto err;
  }
  result=0;					/* Ok */

err:
  if (fd >= 0)
    (void) my_close(fd,MYF(0));
  my_free(buf,MYF(0));
  DBUG_RETURN(result);
}


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

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

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static MYSQL* spawn_init(MYSQL* parent, const char* host,
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			 unsigned int port, const char* user,
			 const char* passwd)
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{
  MYSQL* child;
  if (!(child = mysql_init(0)))
    return 0;
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  child->options.user = my_strdup((user) ? user :
				  (parent->user ? parent->user :
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				   parent->options.user), MYF(0));
  child->options.password = my_strdup((passwd) ? passwd :
				      (parent->passwd ?
				       parent->passwd :
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				       parent->options.password), MYF(0));
  child->options.port = port;
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  child->options.host = my_strdup((host) ? host :
				  (parent->host ?
				   parent->host :
				   parent->options.host), MYF(0));
  if (parent->db)
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    child->options.db = my_strdup(parent->db, MYF(0));
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  else if (parent->options.db)
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    child->options.db = my_strdup(parent->options.db, MYF(0));

  child->options.rpl_parse = child->options.rpl_probe = child->rpl_pivot = 0;
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  return child;
}


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

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

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

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

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/**************************************************************************
  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.
**************************************************************************/

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

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/**************************************************************************
  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;
}


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/*************************************************************************
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  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
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*************************************************************************/

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;
}

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

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));
}


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

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));
}

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

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


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/**************************************************************************
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  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"
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**************************************************************************/

MYSQL_RES * STDCALL
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mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)
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{
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  MYSQL_RES   *result;
  MYSQL_FIELD *fields;
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  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);
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  free_old_query(mysql);
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  if (simple_command(mysql,COM_FIELD_LIST,buff,(ulong) (end-buff),1) ||
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      !(fields= (*mysql->methods->list_fields)(mysql)))
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    DBUG_RETURN(NULL);

  if (!(result = (MYSQL_RES *) my_malloc(sizeof(MYSQL_RES),
					 MYF(MY_WME | MY_ZEROFILL))))
    DBUG_RETURN(NULL);
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  result->methods= mysql->methods;
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  result->field_alloc=mysql->field_alloc;
  mysql->fields=0;
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  result->field_count = mysql->field_count;
  result->fields= fields;
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  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);
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  if (!(fields = (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*) 0,
					      protocol_41(mysql) ? 7 : 5)))
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    DBUG_RETURN(NULL);
  if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,field_count,0,
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				    mysql->server_capabilities)))
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    DBUG_RETURN(0);
  mysql->status=MYSQL_STATUS_GET_RESULT;
  mysql->field_count=field_count;
  DBUG_RETURN(mysql_store_result(mysql));
}

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


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


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)
{
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  char buff[4];
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  DBUG_ENTER("mysql_kill");
  int4store(buff,pid);
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  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));
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}


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

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


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


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


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/*
  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);
}


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


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

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

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ulong STDCALL mysql_get_client_version(void)
{
  return MYSQL_VERSION_ID;
}

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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;
}

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

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

/* MYSQL */

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

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

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

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

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

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

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
}

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

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/*
  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;
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  net->retry_count=  1;
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  net->max_packet_size= max(net_buffer_length, max_allowed_packet);
}

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/*
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  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
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*/

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

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


static ulong
mysql_sub_escape_string(CHARSET_INFO *charset_info, char *to,
			const char *from, ulong length)
{
  const char *to_start=to;
  const char *end;
#ifdef USE_MB
  my_bool use_mb_flag=use_mb(charset_info);
#endif
  for (end=from+length; from != end ; from++)
  {
#ifdef USE_MB
    int l;
    if (use_mb_flag && (l = my_ismbchar(charset_info, from, end)))
    {
      while (l--)
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	*to++ = *from++;
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      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;
    }
  }
  *to=0;
  return (ulong) (to-to_start);
}


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;
}
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/********************************************************************

 Implementation of new client-server prototypes for 4.1 version
 starts from here ..

 mysql_* are real prototypes used by applications

*********************************************************************/

/********************************************************************
 Misc Utility functions
********************************************************************/

/*
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  Set the internal stmt error messages
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*/

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

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

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/*
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  Copy error message to statement handler
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*/

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

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

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/*
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  Set the internal error message to mysql handler
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*/

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

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  mysql->net.last_errno= errcode;
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  strmov(mysql->net.last_error, ER(errcode));
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  strmov(mysql->net.sqlstate, sqlstate);
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}


/*
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  Reallocate the NET package to be at least of 'length' bytes
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  SYNPOSIS
   my_realloc_str()
   net			The NET structure to modify
   int length		Ensure that net->buff is at least this big
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  RETURN VALUES
  0	ok
  1	Error
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*/

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

/********************************************************************
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  Prepare related implementations
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********************************************************************/

/*
  Read the prepare statement results ..
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  NOTE
    This is only called for connection to servers that supports
    prepared statements (and thus the 4.1 protocol)

  RETURN VALUES
    0	ok
    1	error
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*/

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my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
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{
  uchar *pos;
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  uint field_count;
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  ulong length, param_count;
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  MYSQL_DATA *fields_data;
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  DBUG_ENTER("read_prepare_result");
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  mysql= mysql->last_used_con;
  if ((length= net_safe_read(mysql)) == packet_error)
    DBUG_RETURN(1);
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  pos= (uchar*) mysql->net.read_pos;
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  stmt->stmt_id= uint4korr(pos+1); pos+= 5;
  field_count=   uint2korr(pos);   pos+= 2;
  param_count=   uint2korr(pos);   pos+= 2;
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  if (field_count != 0)
  {
    if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
      mysql->server_status|= SERVER_STATUS_IN_TRANS;
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    mysql->extra_info= net_field_length_ll(&pos);
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    if (!(fields_data= (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,7)))
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      DBUG_RETURN(1);
    if (!(stmt->fields= unpack_fields(fields_data,&stmt->mem_root,
				      field_count,0,
				      mysql->server_capabilities)))
      DBUG_RETURN(1);
  }
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  stmt->field_count=  (uint) field_count;
  stmt->param_count=  (ulong) param_count;
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  DBUG_RETURN(0);
}


/*
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  Prepare the query and return the new statement handle to
  caller.

  Also update the total parameter count along with resultset
  metadata information by reading from server
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*/

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MYSQL_STMT *STDCALL
mysql_prepare(MYSQL  *mysql, const char *query, ulong length)
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{
  MYSQL_STMT  *stmt;
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  DBUG_ENTER("mysql_prepare");
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  DBUG_ASSERT(mysql != 0);

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#ifdef CHECK_EXTRA_ARGUMENTS
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  if (!query)
  {
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    set_mysql_error(mysql, CR_NULL_POINTER, unknown_sqlstate);
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    DBUG_RETURN(0);
  }
#endif

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  if (!(stmt= (MYSQL_STMT *) my_malloc(sizeof(MYSQL_STMT),
				       MYF(MY_WME | MY_ZEROFILL))) ||
      !(stmt->query= my_strdup_with_length((byte *) query, length, MYF(0))))
  {
    my_free((gptr) stmt, MYF(MY_ALLOW_ZERO_PTR));
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    set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
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    DBUG_RETURN(0);
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  }
  if (simple_command(mysql, COM_PREPARE, query, length, 1))
  {
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    stmt_close(stmt, 1);
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    DBUG_RETURN(0);
  }

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  init_alloc_root(&stmt->mem_root,8192,0);
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  if ((*mysql->methods->read_prepare_result)(mysql, stmt))
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  {
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    stmt_close(stmt, 1);
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    DBUG_RETURN(0);
  }
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  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(0);
  }
  stmt->bind= stmt->params + stmt->param_count;
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  stmt->state= MY_ST_PREPARE;
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  stmt->mysql= mysql;
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  mysql->stmts= list_add(mysql->stmts, &stmt->list);
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  mysql->status= MYSQL_STATUS_READY;
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  stmt->list.data= stmt;
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  DBUG_PRINT("info", ("Parameter count: %ld", stmt->param_count));
  DBUG_RETURN(stmt);
}

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/*
  Get the execute query meta information for non-select 
  statements (on demand).
*/

unsigned int alloc_stmt_fields(MYSQL_STMT *stmt)
{
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  MYSQL_FIELD *fields, *field, *end;
  MEM_ROOT *alloc= &stmt->mem_root;
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  MYSQL *mysql= stmt->mysql->last_used_con;
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  if (stmt->state != MY_ST_EXECUTE || !mysql->field_count)
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    return 0;
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  stmt->field_count= mysql->field_count;
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  /*
    Get the field information for non-select statements 
    like SHOW and DESCRIBE commands
  */
  if (!(stmt->fields= (MYSQL_FIELD *) alloc_root(alloc, 
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						 sizeof(MYSQL_FIELD) *
						 stmt->field_count)) || 
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      !(stmt->bind= (MYSQL_BIND *) alloc_root(alloc, 
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					      sizeof(MYSQL_BIND) *
					      stmt->field_count)))
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    return 0;
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  for (fields= mysql->fields, end= fields+stmt->field_count, 
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	 field= stmt->fields;
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       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);
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    field->charsetnr= fields->charsetnr;
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    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;
  }
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  return stmt->field_count;
}
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/*
  Returns prepared meta information in the form of resultset
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  to client.
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*/

MYSQL_RES * STDCALL
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mysql_get_metadata(MYSQL_STMT *stmt)
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{
  MYSQL_RES *result;
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  DBUG_ENTER("mysql_get_metadata");
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  if (!stmt->field_count || !stmt->fields)
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  {
    if (!alloc_stmt_fields(stmt))
      DBUG_RETURN(0);
  }  
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  if (!(result=(MYSQL_RES*) my_malloc(sizeof(*result)+
				      sizeof(ulong)*stmt->field_count,
				      MYF(MY_WME | MY_ZEROFILL))))
    return 0;

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  result->methods= stmt->mysql->methods;
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  result->eof=1;	/* Marker for buffered */
  result->fields=	stmt->fields;
  result->field_count=	stmt->field_count;
  DBUG_RETURN(result);
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}

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

MYSQL_RES * STDCALL
mysql_param_result(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_param_result");
  
  if (!stmt->param_count)
    DBUG_RETURN(0);

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


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/********************************************************************
 Prepare-execute, and param handling
*********************************************************************/

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/*
  Store the buffer type
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*/

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static void store_param_type(NET *net, uint type)
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{
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  int2store(net->write_pos, type);
  net->write_pos+=2;
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}

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/****************************************************************************
  Functions to store parameter data from a prepared statement.
1802

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  All functions has the following characteristics:
1804

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

  RETURN VALUES
    0	ok
    1	Error	(Can't alloc net->buffer)
****************************************************************************/

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

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static void store_param_short(NET *net, MYSQL_BIND *param)
{
  short value= *(short*) param->buffer;
  int2store(net->write_pos,value);
  net->write_pos+=2;
}
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static void store_param_int32(NET *net, MYSQL_BIND *param)
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{
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  int32 value= *(int32*) param->buffer;
  int4store(net->write_pos,value);
  net->write_pos+=4;
}
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static void store_param_int64(NET *net, MYSQL_BIND *param)
{
  longlong value= *(longlong*) param->buffer;
  int8store(net->write_pos,value);
  net->write_pos+= 8;
}
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static void store_param_float(NET *net, MYSQL_BIND *param)
{
  float value= *(float*) param->buffer;
  float4store(net->write_pos, value);
  net->write_pos+= 4;
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}

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static void store_param_double(NET *net, MYSQL_BIND *param)
{
  double value= *(double*) param->buffer;
  float8store(net->write_pos, value);
  net->write_pos+= 8;
}
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static void store_param_time(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  char buff[15], *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= 11;
  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[12], *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);
}
    
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static void store_param_str(NET *net, MYSQL_BIND *param)
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{
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  ulong length= param->length ? *param->length : param->buffer_length;
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  char *to= (char *) net_store_length((char *) net->write_pos, length);
  memcpy(to, param->buffer, length);
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  net->write_pos= (uchar*) to+length;
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}

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/*
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  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
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*/

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static void store_param_null(NET *net, MYSQL_BIND *param)
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{
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  uint pos= param->param_number;
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  net->buff[pos/8]|=  (uchar) (1 << (pos & 7));
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}
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/*
  Set parameter data by reading from input buffers from the
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  client application
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*/

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static my_bool store_param(MYSQL_STMT *stmt, MYSQL_BIND *param)
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{
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  MYSQL *mysql= stmt->mysql;
  NET	*net  = &mysql->net;
  DBUG_ENTER("store_param");
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  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)
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    store_param_null(net, param);
  else
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  {
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    /*
      Param->length should ALWAYS point to the correct length for the type
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      Either to the length pointer given by the user or param->buffer_length
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    */
    if ((my_realloc_str(net, 9 + *param->length)))
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    {
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      set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
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      DBUG_RETURN(1);
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    }
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    (*param->store_param_func)(net, param);
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  }
  DBUG_RETURN(0);
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}

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/*
  Send the prepare query to server for execution
*/

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static my_bool execute(MYSQL_STMT * stmt, char *packet, ulong length)
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{
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  MYSQL *mysql= stmt->mysql;
  NET	*net= &mysql->net;
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  char buff[MYSQL_STMT_HEADER];
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  DBUG_ENTER("execute");
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  DBUG_PRINT("enter",("packet: %s, length :%d",packet ? packet :" ", length));

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  mysql->last_used_con= mysql;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
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  if (cli_advanced_command(mysql, COM_EXECUTE, buff, 
			    MYSQL_STMT_HEADER, packet, 
			    length, 1) ||
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      (*mysql->methods->read_query_result)(mysql))
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  {
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    set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
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    DBUG_RETURN(1);
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  }
  DBUG_RETURN(0);
}

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int cli_stmt_execute(MYSQL_STMT *stmt)
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{
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  DBUG_ENTER("cli_stmt_execute");
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  if (stmt->param_count)
  {
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    NET        *net= &stmt->mysql->net;
    MYSQL_BIND *param, *param_end;
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    char       *param_data;
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    ulong length;
    uint null_count;
    my_bool    result;
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#ifdef CHECK_EXTRA_ARGUMENTS
    if (!stmt->param_buffers)
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    {
      /* Parameters exists, but no bound buffers */
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      set_stmt_error(stmt, CR_NOT_ALL_PARAMS_BOUND, unknown_sqlstate);
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      DBUG_RETURN(1);
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    }
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#endif
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    net_clear(net);				/* Sets net->write_pos */
    /* Reserve place for null-marker bytes */
    null_count= (stmt->param_count+7) /8;
    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 */
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    *(net->write_pos)++= (uchar) stmt->send_types_to_server;
    if (stmt->send_types_to_server)
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    {
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      /*
	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(net, (uint) param->buffer_type);
    }

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

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/*
  Execute the prepare query
*/

int STDCALL mysql_execute(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_execute");

  if (stmt->state == MY_ST_UNKNOWN)
  {
    set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
    DBUG_RETURN(1);
  }
  if ((*stmt->mysql->methods->stmt_execute)(stmt))
    DBUG_RETURN(1);
      
  stmt->state= MY_ST_EXECUTE;
  mysql_free_result(stmt->result);
  stmt->result= (MYSQL_RES *)0;
  stmt->result_buffered= 0;
  stmt->current_row= 0;
  DBUG_RETURN(0);
}

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/*
  Return total parameters count in the statement
*/

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

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

my_ulonglong STDCALL mysql_stmt_affected_rows(MYSQL_STMT *stmt)
{
  return stmt->mysql->last_used_con->affected_rows;
}
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static my_bool int_is_null_true= 1;		/* Used for MYSQL_TYPE_NULL */
static my_bool int_is_null_false= 0;

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/*
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  Setup the parameter data buffers from application
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*/

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

#ifdef CHECK_EXTRA_ARGUMENTS
  if (stmt->state == MY_ST_UNKNOWN)
  {
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    set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
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    DBUG_RETURN(1);
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  }
  if (!stmt->param_count)
  {
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    set_stmt_error(stmt, CR_NO_PARAMETERS_EXISTS, unknown_sqlstate);
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    DBUG_RETURN(1);
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  }
#endif

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  /* 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++)
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  {
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    param->param_number= count++;
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    param->long_data_used= 0;

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    /*
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      If param->length is not given, change it to point to buffer_length.
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      This way we can always use *param->length to get the length of data
    */
    if (!param->length)
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      param->length= &param->buffer_length;
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    /* 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;

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    /* Setup data copy functions for the different supported types */
    switch (param->buffer_type) {
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    case MYSQL_TYPE_NULL:
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      param->is_null= &int_is_null_true;
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      break;
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    case MYSQL_TYPE_TINY:
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      /* Force param->length as this is fixed for this type */
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      param->length= &param->buffer_length;
      param->buffer_length= 1;
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      param->store_param_func= store_param_tinyint;
      break;
    case MYSQL_TYPE_SHORT:
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      param->length= &param->buffer_length;
      param->buffer_length= 2;
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      param->store_param_func= store_param_short;
      break;
    case MYSQL_TYPE_LONG:
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      param->length= &param->buffer_length;
      param->buffer_length= 4;
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      param->store_param_func= store_param_int32;
      break;
    case MYSQL_TYPE_LONGLONG:
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      param->length= &param->buffer_length;
      param->buffer_length= 8;
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      param->store_param_func= store_param_int64;
      break;
    case MYSQL_TYPE_FLOAT:
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      param->length= &param->buffer_length;
      param->buffer_length= 4;
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      param->store_param_func= store_param_float;
      break;
    case MYSQL_TYPE_DOUBLE:
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      param->length= &param->buffer_length;
      param->buffer_length= 8;
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      param->store_param_func= store_param_double;
      break;
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    case MYSQL_TYPE_TIME:
      /* Buffer length ignored for DATE, TIME and DATETIME */
      param->store_param_func= store_param_time;
      break;
    case MYSQL_TYPE_DATE:
      param->store_param_func= store_param_date;
      break;
    case MYSQL_TYPE_DATETIME:
    case MYSQL_TYPE_TIMESTAMP:
      param->store_param_func= store_param_datetime;
      break;
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    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
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    case MYSQL_TYPE_BLOB:
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    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
      param->store_param_func= store_param_str;
      break;
    default:
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      strmov(stmt->sqlstate, unknown_sqlstate);
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      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
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	      param->buffer_type, count);
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      DBUG_RETURN(1);
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    }
  }
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  /* We have to send/resendtype information to MySQL */
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  stmt->send_types_to_server= 1;
  stmt->param_buffers= 1;
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  DBUG_RETURN(0);
}

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

/*
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  Send long data in pieces to the server

  SYNOPSIS
    mysql_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)
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  RETURN VALUES
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    0	ok
    1	error
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*/


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my_bool STDCALL
mysql_send_long_data(MYSQL_STMT *stmt, uint param_number,
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		     const char *data, ulong length)
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{
  MYSQL_BIND *param;
  DBUG_ENTER("mysql_send_long_data");
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  DBUG_ASSERT(stmt != 0);
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  DBUG_PRINT("enter",("param no : %d, data : %lx, length : %ld",
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		      param_number, data, length));
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  if (param_number >= stmt->param_count)
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  {
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    set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
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    DBUG_RETURN(1);
  }
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  param= stmt->params+param_number;
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  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 only
    */
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    strmov(stmt->sqlstate, unknown_sqlstate);
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    sprintf(stmt->last_error, ER(stmt->last_errno= CR_INVALID_BUFFER_USE),
	    param->param_number);
    DBUG_RETURN(1);
  }
  /* Mark for execute that the result is already sent */
  param->long_data_used= 1;
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  if (length)
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  {
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    MYSQL *mysql= stmt->mysql;
    char   *packet, extra_data[MYSQL_LONG_DATA_HEADER];

    packet= extra_data;
    int4store(packet, stmt->stmt_id);	   packet+=4;
    int2store(packet, param_number);	   packet+=2;
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    /*
      Note that we don't get any ok packet from the server in this case
      This is intentional to save bandwidth.
    */
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    if ((*mysql->methods->advanced_command)(mysql, COM_LONG_DATA, extra_data,
					    MYSQL_LONG_DATA_HEADER, data, 
					    length, 1))
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    {
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      set_stmt_errmsg(stmt, mysql->net.last_error,
		      mysql->net.last_errno, mysql->net.sqlstate);
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      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN(0);
}

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/********************************************************************
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  Fetch-bind related implementations
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*********************************************************************/

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/****************************************************************************
  Functions to fetch data to application buffers

  All functions has the following characteristics:

  SYNOPSIS
    fetch_result_xxx()
    param   MySQL bind param
    row     Row value

  RETURN VALUES
    0	ok
    1	Error	(Can't alloc net->buffer)
****************************************************************************/

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static void set_zero_time(MYSQL_TIME *tm)
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{
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  tm->year= tm->month= tm->day= 0;
  tm->hour= tm->minute= tm->second= 0;
  tm->second_part= 0;
  tm->neg= (bool)0;
}

/* Read TIME from binary packet and return it to MYSQL_TIME */
static uint read_binary_time(MYSQL_TIME *tm, uchar **pos)
{
  uchar *to;
  uint  length;
 
  if (!(length= net_field_length(pos)))
  {
    set_zero_time(tm);
    return 0;
  }
  
  to= *pos;     
  tm->second_part= (length > 8 ) ? (ulong) sint4korr(to+7): 0;

  tm->day=    (ulong) sint4korr(to+1);
  tm->hour=   (uint) to[5];
  tm->minute= (uint) to[6];
  tm->second= (uint) to[7];

  tm->year= tm->month= 0;
  tm->neg= (bool)to[0];
  return length;
}

/* Read DATETIME from binary packet and return it to MYSQL_TIME */
static uint read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
{
  uchar *to;
  uint  length;
 
  if (!(length= net_field_length(pos)))
  {
    set_zero_time(tm);
    return 0;
  }
  
  to= *pos;     
  tm->second_part= (length > 7 ) ? (ulong) sint4korr(to+7): 0;
    
  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->year=   (uint) sint2korr(to);
  tm->month=  (uint) to[2];
  tm->day=    (uint) to[3];
  tm->neg=    0;
  return length;
}

/* Read DATE from binary packet and return it to MYSQL_TIME */
static uint read_binary_date(MYSQL_TIME *tm, uchar **pos)
{
  uchar *to;
  uint  length;
 
  if (!(length= net_field_length(pos)))
  {
    set_zero_time(tm);
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    return 0;
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  }
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  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;
  return length;
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}

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/* Convert Numeric to buffer types */
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static void send_data_long(MYSQL_BIND *param, longlong value)
{  
  char *buffer= param->buffer;
  
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  switch (param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
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  case MYSQL_TYPE_TINY:
    *param->buffer= (uchar) value;
    break;
  case MYSQL_TYPE_SHORT:
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    int2store(buffer, value);
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    break;
  case MYSQL_TYPE_LONG:
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    int4store(buffer, value);
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    break;
  case MYSQL_TYPE_LONGLONG:
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    int8store(buffer, value);
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    break;
  case MYSQL_TYPE_FLOAT:
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  {
    float data= (float)value;
    float4store(buffer, data);
    break;
  }
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  case MYSQL_TYPE_DOUBLE:
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  {
    double data= (double)value;
    float8store(buffer, data);
    break;
  }
2451
  default:
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  {
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    char tmp[22];				/* Enough for longlong */
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    uint length= (uint)(longlong10_to_str(value,(char *)tmp,10)-tmp);
    ulong copy_length= min((ulong)length-param->offset, param->buffer_length);
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    if ((long) copy_length < 0)
      copy_length=0;
    else
      memcpy(buffer, (char *)tmp+param->offset, copy_length);
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    *param->length= length;		
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    if (copy_length != param->buffer_length)
      *(buffer+copy_length)= '\0';
  }
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  } 
}

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2469
/* Convert Double to buffer types */
2470

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static void send_data_double(MYSQL_BIND *param, double value)
{  
  char *buffer= param->buffer;

  switch(param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
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  case MYSQL_TYPE_TINY:
    *buffer= (uchar)value;
    break;
  case MYSQL_TYPE_SHORT:
    int2store(buffer, (short)value);
    break;
  case MYSQL_TYPE_LONG:
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    int4store(buffer, (long)value);
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    break;
  case MYSQL_TYPE_LONGLONG:
    int8store(buffer, (longlong)value);
    break;
  case MYSQL_TYPE_FLOAT:
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  {
    float data= (float)value;
    float4store(buffer, data);
    break;
  }
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  case MYSQL_TYPE_DOUBLE:
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  {
    double data= (double)value;
    float8store(buffer, data);
    break;
  }
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  default:
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  {
2504
    char tmp[128];
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    uint length= my_sprintf(tmp,(tmp,"%g",value));
    ulong copy_length= min((ulong)length-param->offset, param->buffer_length);
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    if ((long) copy_length < 0)
      copy_length=0;
    else
      memcpy(buffer, (char *)tmp+param->offset, copy_length);
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    *param->length= length;		
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    if (copy_length != param->buffer_length)
      *(buffer+copy_length)= '\0';
  }
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  } 
}

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2520
/* Convert string to buffer types */
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2522
static void send_data_str(MYSQL_BIND *param, char *value, uint length)
2523 2524
{  
  char *buffer= param->buffer;
2525
  int err=0;
2526 2527

  switch(param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
2530
  case MYSQL_TYPE_TINY:
2531
  {
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    uchar data= (uchar)my_strntol(&my_charset_latin1,value,length,10,NULL,
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				  &err);
2534
    *buffer= data;
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    break;
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  }
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  case MYSQL_TYPE_SHORT:
  {
2539
    short data= (short)my_strntol(&my_charset_latin1,value,length,10,NULL,
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				  &err);
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    int2store(buffer, data);
    break;
  }
  case MYSQL_TYPE_LONG:
  {
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    int32 data= (int32)my_strntol(&my_charset_latin1,value,length,10,NULL,
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				  &err);
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    int4store(buffer, data);    
    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
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    longlong data= my_strntoll(&my_charset_latin1,value,length,10,NULL,&err);
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    int8store(buffer, data);
    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
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    float data = (float)my_strntod(&my_charset_latin1,value,length,NULL,&err);
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    float4store(buffer, data);
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
2565
    double data= my_strntod(&my_charset_latin1,value,length,NULL,&err);
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    float8store(buffer, data);
    break;
  }
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  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
    *param->length= length;
    length= min(length-param->offset, param->buffer_length);
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    if ((long) length > 0)
      memcpy(buffer, value+param->offset, length);
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    break;
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  default:
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    *param->length= length;
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    length= min(length-param->offset, param->buffer_length);
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    if ((long) length < 0)
      length= 0;
    else
      memcpy(buffer, value+param->offset, length);
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    if (length != param->buffer_length)
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      buffer[length]= '\0';
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  }
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}

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static void send_data_time(MYSQL_BIND *param, MYSQL_TIME ltime, 
                           uint length)
{
  switch (param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
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  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
    
    tm->year= ltime.year;
    tm->month= ltime.month;
    tm->day= ltime.day;

    tm->hour= ltime.hour;
    tm->minute= ltime.minute;
    tm->second= ltime.second;

    tm->second_part= ltime.second_part;
    tm->neg= ltime.neg;
    break;   
  }
  default:
  {
    char buff[25];
    
    if (!length)
      ltime.time_type= MYSQL_TIMESTAMP_NONE;
    switch (ltime.time_type) {
    case MYSQL_TIMESTAMP_DATE:
      length= my_sprintf(buff,(buff, "%04d-%02d-%02d", ltime.year,
2626
			       ltime.month,ltime.day));      
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      break;
    case MYSQL_TIMESTAMP_FULL:
      length= my_sprintf(buff,(buff, "%04d-%02d-%02d %02d:%02d:%02d",
	                       ltime.year,ltime.month,ltime.day,
	                       ltime.hour,ltime.minute,ltime.second));
      break;
    case MYSQL_TIMESTAMP_TIME:
      length= my_sprintf(buff, (buff, "%02d:%02d:%02d",
2635
				ltime.hour,ltime.minute,ltime.second));
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      break;
    default:
      length= 0;
      buff[0]='\0';
    }
    send_data_str(param, (char *)buff, length); 
  }
  }
}
                              

2647
/* Fetch data to buffers */
2648

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static void fetch_results(MYSQL_BIND *param, MYSQL_FIELD *field, uchar **row)
2650 2651
{
  ulong length;
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  enum enum_field_types field_type= field->type;

2654 2655 2656
  switch (field_type) {
  case MYSQL_TYPE_TINY:
  {
2657
    char value= (char) **row;
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    uint field_is_unsigned= (field->flags & UNSIGNED_FLAG);
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    longlong data= ((field_is_unsigned) ? (longlong) (unsigned char) value:
		    (longlong) value);
2661
    send_data_long(param,data);
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    length= 1;
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    break;
  }
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_YEAR:
  {
2668
    short value= sint2korr(*row);
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    uint field_is_unsigned= (field->flags & UNSIGNED_FLAG);
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    longlong data= ((field_is_unsigned) ? (longlong) (unsigned short) value:
		    (longlong) value);
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    send_data_long(param,data);
    length= 2;    
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    break;
  }
  case MYSQL_TYPE_LONG:
  {
2678
    long value= sint4korr(*row);
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    uint field_is_unsigned= (field->flags & UNSIGNED_FLAG);
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    longlong data= ((field_is_unsigned) ? (longlong) (unsigned long) value:
		    (longlong) value);
2682
    send_data_long(param,data);
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    length= 4;
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    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong value= (longlong)sint8korr(*row);
    send_data_long(param,value);
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    length= 8;
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    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
    float value;
    float4get(value,*row);
2697
    send_data_double(param,value);
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    length= 4;
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    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
    double value;
    float8get(value,*row);
2705
    send_data_double(param,value);
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    length= 8;
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    break;
  }
  case MYSQL_TYPE_DATE:
  {
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    MYSQL_TIME tm;
 
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    length= read_binary_date(&tm, row);
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    tm.time_type= MYSQL_TIMESTAMP_DATE;
    send_data_time(param, tm, length);
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    break;
  }
  case MYSQL_TYPE_TIME:
  {
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    MYSQL_TIME tm;
 
    length= read_binary_time(&tm, row);
    tm.time_type= MYSQL_TIMESTAMP_TIME;
    send_data_time(param, tm, length);
    break;
  }
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
  {
    MYSQL_TIME tm;
 
    length= read_binary_datetime(&tm, row);
    tm.time_type= MYSQL_TIMESTAMP_FULL;
    send_data_time(param, tm, length);
2735 2736 2737 2738
    break;
  }
  default:      
    length= net_field_length(row); 
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    send_data_str(param,(char*) *row,length);
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    break;
  }
  *row+= length;
}

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static void fetch_result_tinyint(MYSQL_BIND *param, uchar **row)
{
  *param->buffer= (uchar) **row;
2749
  (*row)++;
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}

static void fetch_result_short(MYSQL_BIND *param, uchar **row)
{
2754 2755 2756
  short value = (short)sint2korr(*row);
  int2store(param->buffer, value);
  *row+= 2;
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}

static void fetch_result_int32(MYSQL_BIND *param, uchar **row)
{
2761
  int32 value= (int32)sint4korr(*row);
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  int4store(param->buffer, value);
2763
  *row+= 4;
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}

static void fetch_result_int64(MYSQL_BIND *param, uchar **row)
2767 2768
{  
  longlong value= (longlong)sint8korr(*row);
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  int8store(param->buffer, value);
2770
  *row+= 8;
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}

static void fetch_result_float(MYSQL_BIND *param, uchar **row)
{
  float value;
  float4get(value,*row);
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  float4store(param->buffer, value);
2778
  *row+= 4;
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}

static void fetch_result_double(MYSQL_BIND *param, uchar **row)
{
  double value;
  float8get(value,*row);
  float8store(param->buffer, value);
2786
  *row+= 8;
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}

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

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

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

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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;
}
2815

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static void fetch_result_str(MYSQL_BIND *param, uchar **row)
{
  ulong length= net_field_length(row);
2819 2820
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
2821 2822 2823
  /* Add an end null if there is room in the buffer */
  if (copy_length != param->buffer_length)
    *(param->buffer+copy_length)= '\0';
2824
  *param->length= length;			/* return total length */
2825
  *row+= length;
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}

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2829
/*
2830
  Setup the bind buffers for resultset processing
2831 2832
*/

2833
my_bool STDCALL mysql_bind_result(MYSQL_STMT *stmt, MYSQL_BIND *bind)
2834
{
2835 2836
  MYSQL_BIND *param, *end;
  ulong       bind_count;
2837
  uint        param_count= 0;
2838 2839 2840
  DBUG_ENTER("mysql_bind_result");
  DBUG_ASSERT(stmt != 0);

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#ifdef CHECK_EXTRA_ARGUMENTS
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  if (stmt->state == MY_ST_UNKNOWN)
  {
2844
    set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
2845 2846
    DBUG_RETURN(1);
  }
2847 2848
  if (!bind)
  {
2849
    set_stmt_error(stmt, CR_NULL_POINTER, unknown_sqlstate);
2850
    DBUG_RETURN(1);
2851
  }
2852
#endif
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  if (!(bind_count= stmt->field_count) && 
      !(bind_count= alloc_stmt_fields(stmt)))
    DBUG_RETURN(0);
  
2857 2858
  memcpy((char*) stmt->bind, (char*) bind,
	 sizeof(MYSQL_BIND)*bind_count);
2859

2860
  for (param= stmt->bind, end= param+bind_count; param < end ; param++)
2861
  {
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    /*
      Set param->is_null to point to a dummy variable if it's not set.
      This is to make the excute code easier
    */
    if (!param->is_null)
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      param->is_null= &param->internal_is_null;
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    if (!param->length)
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      param->length= &param->internal_length;
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2872
    param->param_number= param_count++;
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    param->offset= 0;

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    /* Setup data copy functions for the different supported types */
    switch (param->buffer_type) {
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    case MYSQL_TYPE_NULL: /* for dummy binds */
      break;
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    case MYSQL_TYPE_TINY:
      param->fetch_result= fetch_result_tinyint;
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      *param->length= 1;
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      break;
    case MYSQL_TYPE_SHORT:
      param->fetch_result= fetch_result_short;
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      *param->length= 2;
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      break;
    case MYSQL_TYPE_LONG:
      param->fetch_result= fetch_result_int32;
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      *param->length= 4;
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      break;
    case MYSQL_TYPE_LONGLONG:
      param->fetch_result= fetch_result_int64;
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      *param->length= 8;
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      break;
    case MYSQL_TYPE_FLOAT:
      param->fetch_result= fetch_result_float;
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      *param->length= 4;
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      break;
    case MYSQL_TYPE_DOUBLE:
      param->fetch_result= fetch_result_double;
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      *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);
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      break;
    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
2919
    case MYSQL_TYPE_BLOB:
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      DBUG_ASSERT(param->buffer_length != 0);
      param->fetch_result= fetch_result_bin;
      break;
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    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
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      DBUG_ASSERT(param->buffer_length != 0);
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      param->fetch_result= fetch_result_str;
      break;
    default:
2929
      strmov(stmt->sqlstate, unknown_sqlstate);
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      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
2932
	      param->buffer_type, param_count);
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      DBUG_RETURN(1);
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    }
2935
  }
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  stmt->res_buffers= 1;
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  DBUG_RETURN(0);
}

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2941
/*
2942
  Fetch row data to bind buffers
2943 2944
*/

2945
static int stmt_fetch_row(MYSQL_STMT *stmt, uchar *row)
2946
{
2947
  MYSQL_BIND  *bind, *end;
2948
  MYSQL_FIELD *field, *field_end;
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  uchar *null_ptr, bit;
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  if (!row || !stmt->res_buffers)
    return 0;
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  null_ptr= row; 
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  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */
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  /* Copy complete row to application buffers */
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  for (bind= stmt->bind, end= (MYSQL_BIND *) bind + stmt->field_count, 
2960 2961
	 field= stmt->fields, 
	 field_end= (MYSQL_FIELD *)stmt->fields+stmt->field_count;
2962
       bind < end && field < field_end;
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       bind++, field++)
  {         
2965
    if (*null_ptr & bit)
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      *bind->is_null= bind->null_field= 1;
2967
    else
2968
    { 
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      *bind->is_null= bind->null_field= 0;
      bind->inter_buffer= row;
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      if (field->type == bind->buffer_type)
        (*bind->fetch_result)(bind, &row);
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      else 
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        fetch_results(bind, field, &row);
2975
    }
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    if (!((bit<<=1) & 255))
2977
    {
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      bit= 1;					/* To next byte */
2979
      null_ptr++;
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    }
  }
  return 0;
}

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

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  *row= ((mysql->net.read_pos[0] == 254) ? NULL :
	 (char*) (mysql->net.read_pos+1));
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  return 0;
}
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2995
/*
2996
  Fetch and return row data to bound buffers, if any
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*/

2999
int STDCALL mysql_fetch(MYSQL_STMT *stmt)
3000
{
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  MYSQL *mysql= stmt->mysql;
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  uchar *row;
3003 3004
  DBUG_ENTER("mysql_fetch");

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  stmt->last_fetched_column= 0;			/* reset */
  if (stmt->result_buffered)			/* buffered */
3007
  {
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    MYSQL_RES *res;
    
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    if (!(res= stmt->result))
3011
      goto no_data;
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    if (!res->data_cursor) 
    {
3015
      stmt->current_row= 0;
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      goto no_data;
    }    
3018 3019
    row= (uchar *)res->data_cursor->data;
    res->data_cursor= res->data_cursor->next;
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  }
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  else						/* un-buffered */
3022
  {
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    if((*mysql->methods->unbuffered_fetch)(mysql, ( char **)&row))
3024
    {
3025 3026
      set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
		      mysql->net.sqlstate);
3027 3028
      DBUG_RETURN(1);
    }
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    if (!row)
3030 3031
    {
      mysql->status= MYSQL_STATUS_READY;
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      stmt->current_row= 0;
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      goto no_data;
    }
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  }

3037
  stmt->current_row= row;    
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  DBUG_RETURN(stmt_fetch_row(stmt, row));

no_data:
  DBUG_PRINT("info", ("end of data"));    
  DBUG_RETURN(MYSQL_NO_DATA); /* no more data */
}

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/*
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  Fetch datat for one specified column data

  SYNOPSIS
    mysql_fetch_column()
    stmt		Prepared statement handler
    bind		Where date should be placed. Should be filled in as
			when calling mysql_bind_param()
    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
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*/

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

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  if (!stmt->current_row)
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    goto no_data;

#ifdef CHECK_EXTRA_ARGUMENTS  
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  if (column >= stmt->field_count)
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  {
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    set_stmt_errmsg(stmt, "Invalid column descriptor",1, unknown_sqlstate);
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    DBUG_RETURN(1);
  }
#endif

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

no_data:
  DBUG_PRINT("info", ("end of data"));    
  DBUG_RETURN(MYSQL_NO_DATA); /* no more data */
}


3105
/*
3106 3107 3108
  Read all rows of data from server  (binary format)
*/

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MYSQL_DATA *cli_read_binary_rows(MYSQL_STMT *stmt)
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120
{
  ulong      pkt_len;
  uchar      *cp;
  MYSQL      *mysql= stmt->mysql;
  MYSQL_DATA *result;
  MYSQL_ROWS *cur, **prev_ptr;
  NET        *net = &mysql->net;
  DBUG_ENTER("read_binary_rows");
 
  mysql= mysql->last_used_con;
  if ((pkt_len= net_safe_read(mysql)) == packet_error)
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  {
3122 3123 3124
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
		    mysql->net.sqlstate);

3125 3126 3127 3128 3129 3130 3131 3132
    DBUG_RETURN(0);
  }
  if (mysql->net.read_pos[0] == 254) /* end of data */
    return 0;				

  if (!(result=(MYSQL_DATA*) my_malloc(sizeof(MYSQL_DATA),
				       MYF(MY_WME | MY_ZEROFILL))))
  {
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    set_stmt_errmsg(stmt, ER(CR_OUT_OF_MEMORY), CR_OUT_OF_MEMORY,
		    unknown_sqlstate);
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    DBUG_RETURN(0);
  }
  init_alloc_root(&result->alloc,8192,0);	/* Assume rowlength < 8192 */
  result->alloc.min_malloc= sizeof(MYSQL_ROWS);
  prev_ptr= &result->data;
  result->rows= 0;

  while (*(cp=net->read_pos) != 254 || pkt_len >= 8)
  {
    result->rows++;

    if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,sizeof(MYSQL_ROWS))) ||
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	!(cur->data= ((MYSQL_ROW) alloc_root(&result->alloc, pkt_len))))
3148 3149
    {
      free_rows(result);
3150 3151
      set_stmt_errmsg(stmt, ER(CR_OUT_OF_MEMORY), CR_OUT_OF_MEMORY,
		      unknown_sqlstate);
3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173
      DBUG_RETURN(0);
    }
    *prev_ptr= cur;
    prev_ptr= &cur->next;
    memcpy(cur->data, (char*)cp+1, pkt_len-1); 
	  
    if ((pkt_len=net_safe_read(mysql)) == packet_error)
    {
      free_rows(result);
      DBUG_RETURN(0);
    }
  }
  *prev_ptr= 0;
  if (pkt_len > 1)
  {
    mysql->warning_count= uint2korr(cp+1);
    DBUG_PRINT("info",("warning_count:  %ld", mysql->warning_count));
  }
  DBUG_PRINT("exit",("Got %d rows",result->rows));
  DBUG_RETURN(result);
}

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3175 3176 3177 3178 3179 3180 3181 3182
/*
  Store or buffer the binary results to stmt
*/

int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
{
  MYSQL *mysql= stmt->mysql;
  MYSQL_RES *result;
3183
  DBUG_ENTER("mysql_stmt_store_result");
3184 3185 3186 3187 3188 3189 3190

  mysql= mysql->last_used_con;

  if (!stmt->field_count)
    DBUG_RETURN(0);
  if (mysql->status != MYSQL_STATUS_GET_RESULT)
  {
3191
    set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
3192
    DBUG_RETURN(1);
3193 3194 3195
  }
  mysql->status= MYSQL_STATUS_READY;		/* server is ready */
  if (!(result= (MYSQL_RES*) my_malloc((uint) (sizeof(MYSQL_RES)+
3196 3197 3198
					       sizeof(ulong) *
					       stmt->field_count),
				       MYF(MY_WME | MY_ZEROFILL))))
3199
  {
3200
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
3201
    DBUG_RETURN(1);
3202
  }
3203
  result->methods= mysql->methods;
3204
  stmt->result_buffered= 1;
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  if (!(result->data= (*stmt->mysql->methods->read_binary_rows)(stmt)))
3206 3207 3208 3209 3210 3211 3212 3213 3214 3215
  {
    my_free((gptr) result,MYF(0));
    DBUG_RETURN(0);
  }
  mysql->affected_rows= result->row_count= result->data->rows;
  result->data_cursor=	result->data->data;
  result->fields=	stmt->fields;
  result->field_count=	stmt->field_count;
  stmt->result= result;
  DBUG_RETURN(0); /* Data buffered, must be fetched with mysql_fetch() */
3216 3217
}

3218

3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240
/*
  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_RES *result;
  DBUG_ENTER("mysql_stmt_row_seek");
  
  if ((result= stmt->result))
  {
    MYSQL_ROW_OFFSET return_value= result->data_cursor;
    result->current_row= 0;
    result->data_cursor= row;
    DBUG_RETURN(return_value);
  }
  
  DBUG_PRINT("exit", ("stmt doesn't contain any resultset"));
  DBUG_RETURN(0);
}

3241

3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257
/*
  Return the current statement row cursor position
*/

MYSQL_ROW_OFFSET STDCALL 
mysql_stmt_row_tell(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_row_tell");
  
  if (stmt->result)
    DBUG_RETURN(stmt->result->data_cursor);
  
  DBUG_PRINT("exit", ("stmt doesn't contain any resultset"));
  DBUG_RETURN(0);
}

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3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269
/*
  Move the stmt result set data cursor to specified row
*/

void STDCALL
mysql_stmt_data_seek(MYSQL_STMT *stmt, my_ulonglong row)
{
  MYSQL_RES   *result;
  DBUG_ENTER("mysql_stmt_data_seek");
  DBUG_PRINT("enter",("row id to seek: %ld",(long) row));
  
3270
  if ((result= stmt->result))
3271 3272 3273 3274 3275 3276 3277
  {
    MYSQL_ROWS	*tmp= 0;
    if (result->data)
      for (tmp=result->data->data; row-- && tmp ; tmp = tmp->next) ;
    result->current_row= 0;
    result->data_cursor= tmp;
  }
3278 3279
  else
    DBUG_PRINT("exit", ("stmt doesn't contain any resultset"));
3280
  DBUG_VOID_RETURN;
3281 3282
}

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3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296
/*
  Return total rows the current statement result set
*/

my_ulonglong STDCALL mysql_stmt_num_rows(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_num_rows");
    
  if (stmt->result)
    DBUG_RETURN(stmt->result->row_count);
  
  DBUG_PRINT("exit", ("stmt doesn't contain any resultset"));
  DBUG_RETURN(0);
3297
}
3298 3299

/********************************************************************
3300
 statement error handling and close
3301
*********************************************************************/
3302

3303
/*
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  Close the statement handle by freeing all alloced resources
3305

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3306 3307 3308 3309 3310 3311 3312 3313
  SYNOPSIS
    mysql_stmt_close()
    stmt	       Statement handle
    skip_list    Flag to indicate delete from list or not
  RETURN VALUES
    0	ok
    1	error
*/
3314 3315 3316

my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt)
{ 
3317
  MYSQL *mysql;
3318
  DBUG_ENTER("mysql_stmt_free_result");
3319

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  DBUG_ASSERT(stmt != 0);
3321
  
3322
  mysql= stmt->mysql;
3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
  if (mysql->status != MYSQL_STATUS_READY)
  {
    /* Clear the current execution status */
    DBUG_PRINT("warning",("Not all packets read, clearing them"));
    for (;;)
    {
      ulong pkt_len;
      if ((pkt_len= net_safe_read(mysql)) == packet_error)
        break;
      if (pkt_len <= 8 && mysql->net.read_pos[0] == 254)
        break;	
    }
    mysql->status= MYSQL_STATUS_READY;
  }
3337
  mysql_free_result(stmt->result);
3338 3339 3340
  stmt->result= 0;
  stmt->result_buffered= 0;
  stmt->current_row= 0;
3341 3342 3343
  DBUG_RETURN(0);
}

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3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357
my_bool stmt_close(MYSQL_STMT *stmt, my_bool skip_list)
{
  MYSQL *mysql;
  DBUG_ENTER("mysql_stmt_close");

  DBUG_ASSERT(stmt != 0);
  
  if (!(mysql= stmt->mysql))
  {
    my_free((gptr) stmt, MYF(MY_WME));
    DBUG_RETURN(0);
  }
  mysql_stmt_free_result(stmt);
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  if (stmt->state == MY_ST_PREPARE || stmt->state == MY_ST_EXECUTE)
3359 3360 3361
  {
    char buff[4];
    int4store(buff, stmt->stmt_id);
3362 3363
    if (simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1))
    {
3364 3365
      set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
		      mysql->net.sqlstate);
3366 3367 3368
      stmt->mysql= NULL; /* connection isn't valid anymore */
      DBUG_RETURN(1);
    }
3369
  }
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  stmt->field_count= 0;
3371 3372 3373 3374
  free_root(&stmt->mem_root, MYF(0));
  if (!skip_list)
    mysql->stmts= list_delete(mysql->stmts, &stmt->list);
  mysql->status= MYSQL_STATUS_READY;
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  my_free((gptr) stmt->query, MYF(MY_WME));
3376 3377
  my_free((gptr) stmt, MYF(MY_WME));
  DBUG_RETURN(0);
3378 3379
}

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3380

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3381 3382 3383 3384 3385
my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
{
  return stmt_close(stmt, 0);
}

3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398
/*
  Reset the statement buffers in server
*/

my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
{
  char buff[MYSQL_STMT_HEADER];
  MYSQL *mysql;
  DBUG_ENTER("mysql_stmt_reset");
  DBUG_ASSERT(stmt != 0);
  
  mysql= stmt->mysql->last_used_con;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
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  if ((*mysql->methods->advanced_command)(mysql, COM_RESET_STMT,buff,MYSQL_STMT_HEADER,0,0,1))
3400 3401 3402 3403 3404 3405 3406 3407
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno, 
                    mysql->net.sqlstate);
    DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}

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/*
  Return statement error code
*/

uint STDCALL mysql_stmt_errno(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_errno");
3415
  DBUG_RETURN(stmt->last_errno);
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}

3418 3419 3420 3421 3422 3423
const char *STDCALL mysql_stmt_sqlstate(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_sqlstate");
  DBUG_RETURN(stmt->sqlstate);
}

3424 3425 3426 3427 3428 3429 3430
/*
  Return statement error message
*/

const char *STDCALL mysql_stmt_error(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_error");
3431
  DBUG_RETURN(stmt->last_error);
3432 3433
}

3434 3435 3436 3437
/********************************************************************
 Transactional APIs
*********************************************************************/

3438 3439 3440 3441
/*
  Commit the current transaction
*/

3442
my_bool STDCALL mysql_commit(MYSQL * mysql)
3443 3444
{
  DBUG_ENTER("mysql_commit");
3445
  DBUG_RETURN((my_bool) mysql_real_query(mysql, "commit", 6));
3446 3447 3448
}

/*
3449
  Rollback the current transaction
3450 3451
*/

3452
my_bool STDCALL mysql_rollback(MYSQL * mysql)
3453 3454
{
  DBUG_ENTER("mysql_rollback");
3455
  DBUG_RETURN((my_bool) mysql_real_query(mysql, "rollback", 8));
3456 3457 3458 3459 3460 3461 3462
}


/*
  Set autocommit to either true or false
*/

3463
my_bool STDCALL mysql_autocommit(MYSQL * mysql, my_bool auto_mode)
3464 3465 3466 3467 3468
{
  DBUG_ENTER("mysql_autocommit");
  DBUG_PRINT("enter", ("mode : %d", auto_mode));

  if (auto_mode) /* set to true */
3469 3470
    DBUG_RETURN((my_bool) mysql_real_query(mysql, "set autocommit=1", 16));
  DBUG_RETURN((my_bool) mysql_real_query(mysql, "set autocommit=0", 16));
3471
}
3472 3473 3474


/********************************************************************
3475
 Multi query execution + SPs APIs
3476 3477 3478 3479 3480 3481 3482 3483 3484
*********************************************************************/

/*
  Returns if there are any more query results exists to be read using 
  mysql_next_result()
*/

my_bool STDCALL mysql_more_results(MYSQL *mysql)
{
3485
  my_bool res;
3486 3487
  DBUG_ENTER("mysql_more_results");
  
3488 3489 3490 3491
  res= ((mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS) ? 
	1: 0);
  DBUG_PRINT("exit",("More results exists ? %d", res)); 
  DBUG_RETURN(res);
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}

3494

3495 3496 3497 3498
/*
  Reads and returns the next query results
*/

3499
int STDCALL mysql_next_result(MYSQL *mysql)
3500
{
3501
  DBUG_ENTER("mysql_next_result");
3502
  
3503 3504 3505 3506 3507 3508 3509 3510
  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);
  }

3511 3512
  mysql->net.last_error[0]= 0;
  mysql->net.last_errno= 0;
3513
  strmov(mysql->net.sqlstate, not_error_sqlstate);
3514 3515 3516
  mysql->affected_rows= ~(my_ulonglong) 0;

  if (mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS)
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    DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
3518
  
3519
  DBUG_RETURN(-1);				/* No more results */
3520
}
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3522

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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);
}