mariadb/libmysqld/libmysqld.c

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA */

#include "embedded_priv.h"
#include <my_sys.h>
#include <mysys_err.h>
#include <m_string.h>
#include <m_ctype.h>
#include "errmsg.h"
#include <violite.h>
#include <sys/stat.h>
#include <signal.h>
#include <time.h>
#ifdef	 HAVE_PWD_H
#include <pwd.h>
#endif
#if !defined(MSDOS) && !defined(__WIN__)
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef HAVE_SELECT_H
#  include <select.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif
#ifdef HAVE_SYS_UN_H
#  include <sys/un.h>
#endif
#ifndef INADDR_NONE
#define INADDR_NONE	-1
#endif

static my_bool	mysql_client_init=0;
uint		mysql_port=0;
my_string	mysql_unix_port=0;

#define CLIENT_CAPABILITIES	(CLIENT_LONG_PASSWORD | CLIENT_LONG_FLAG | CLIENT_TRANSACTIONS)

#if defined(MSDOS) || defined(__WIN__)
#define ERRNO WSAGetLastError()
#define perror(A)
#else
#include <errno.h>
#define ERRNO errno
#define SOCKET_ERROR -1
#define closesocket(A) close(A)
#endif

static void mysql_once_init(void);
static MYSQL_DATA *read_rows (MYSQL *mysql,MYSQL_FIELD *fields,
			      uint field_count);
static int read_one_row(MYSQL *mysql,uint fields,MYSQL_ROW row,
			ulong *lengths);
static void end_server(MYSQL *mysql);
static void read_user_name(char *name);
static void append_wild(char *to,char *end,const char *wild);
static int send_file_to_server(MYSQL *mysql,const char *filename);
static ulong mysql_sub_escape_string(CHARSET_INFO *charset_info, char *to,
				     const char *from, ulong length);

#define init_sigpipe_variables
#define set_sigpipe(mysql)
#define reset_sigpipe(mysql)

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

/*****************************************************************************
** read a packet from server. Give error message if socket was down
** or packet is an error message
*****************************************************************************/

static uint
net_safe_read(MYSQL *mysql)
{
  NET *net= &mysql->net;
  uint len=0;
  //init_sigpipe_variables
  /* Don't give sigpipe errors if the client doesn't want them */
  set_sigpipe(mysql);
  if (net->vio != 0)
    len=my_net_read(net);
  reset_sigpipe(mysql);
  if (len == packet_error || len == 0)
  {
    DBUG_PRINT("error",("Wrong connection or packet. fd: %s  len: %d",
			vio_description(net->vio),len));
    end_server(mysql);
    net->last_errno=(net->last_errno == ER_NET_PACKET_TOO_LARGE ? 
		     CR_NET_PACKET_TOO_LARGE:
		     CR_SERVER_LOST);
    strmov(net->last_error,ER(net->last_errno));
    return(packet_error);
  }
  if (net->read_pos[0] == 255)
  {

    if (len > 3)
    {
      char *pos=(char*) net->read_pos+1;
      if (mysql->protocol_version > 9)
      {						/* New client protocol */
	net->last_errno=uint2korr(pos);
	pos+=2;
	len-=2;
      }
      else
      {
	net->last_errno=CR_UNKNOWN_ERROR;
	len--;
      }
      (void) strmake(net->last_error,(char*) pos,
		     min(len,sizeof(net->last_error)-1));
    }
    else
    {
      net->last_errno=CR_UNKNOWN_ERROR;
      (void) strmov(net->last_error,ER(net->last_errno));
    }
    DBUG_PRINT("error",("Got error: %d (%s)", net->last_errno,
			net->last_error));
    return(packet_error);
  }
  return len;
}


/* Get the length of next field. Change parameter to point at fieldstart */
static ulong
net_field_length(uchar **packet)
{
  reg1 uchar *pos= *packet;
  if (*pos < 251)
  {
    (*packet)++;
    return (ulong) *pos;
  }
  if (*pos == 251)
  {
    (*packet)++;
    return NULL_LENGTH;
  }
  if (*pos == 252)
  {
    (*packet)+=3;
    return (ulong) uint2korr(pos+1);
  }
  if (*pos == 253)
  {
    (*packet)+=4;
    return (ulong) uint3korr(pos+1);
  }
  (*packet)+=9;					/* Must be 254 when here */
  return (ulong) uint4korr(pos+1);
}

/* Same as above, but returns ulonglong values */

static my_ulonglong
net_field_length_ll(uchar **packet)
{
  reg1 uchar *pos= *packet;
  if (*pos < 251)
  {
    (*packet)++;
    return (my_ulonglong) *pos;
  }
  if (*pos == 251)
  {
    (*packet)++;
    return (my_ulonglong) NULL_LENGTH;
  }
  if (*pos == 252)
  {
    (*packet)+=3;
    return (my_ulonglong) uint2korr(pos+1);
  }
  if (*pos == 253)
  {
    (*packet)+=4;
    return (my_ulonglong) uint3korr(pos+1);
  }
  (*packet)+=9;					/* Must be 254 when here */
#ifdef NO_CLIENT_LONGLONG
  return (my_ulonglong) uint4korr(pos+1);
#else
  return (my_ulonglong) uint8korr(pos+1);
#endif
}


static void free_rows(MYSQL_DATA *cur)
{
  if (cur)
  {
    free_root(&cur->alloc,MYF(0));
    my_free((gptr) cur,MYF(0));
  }
}


static int
simple_command(MYSQL *mysql,enum enum_server_command command, const char *arg,
	       uint length, my_bool skipp_check)
{
  NET *net= &mysql->net;
  int result= -1;

  /* Check that we are calling the client functions in right order */
  if (mysql->status != MYSQL_STATUS_READY)
  {
    strmov(net->last_error,ER(mysql->net.last_errno=CR_COMMANDS_OUT_OF_SYNC));
    goto end;
  }

  /* Clear result variables */
  mysql->net.last_error[0]=0;
  mysql->net.last_errno=0;
  mysql->info=0;
  mysql->affected_rows= ~(my_ulonglong) 0;

  /* Clear receive buffer and vio packet list */
  net_clear(net);
  vio_reset(net->vio);

  result = lib_dispatch_command(command, net, arg,length);
  if (!skipp_check)
    result= ((mysql->packet_length=net_safe_read(mysql)) == packet_error ?
	     -1 : 0);
 end:
  return result;
}


static void free_old_query(MYSQL *mysql)
{
  DBUG_ENTER("free_old_query");
  if (mysql->fields)
    free_root(&mysql->field_alloc,MYF(0));
  init_alloc_root(&mysql->field_alloc,8192,0);	/* Assume rowlength < 8192 */
  mysql->fields=0;
  mysql->field_count=0;				/* For API */
  DBUG_VOID_RETURN;
}

#ifdef HAVE_GETPWUID
struct passwd *getpwuid(uid_t);
char* getlogin(void);
#endif

#if !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__)
static 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;
/*#ifdef __cplusplus
    extern "C" struct passwd *getpwuid(uid_t);
    extern "C" { char* getlogin(void); }
#else
    char * getlogin();
    struct passwd *getpwuid(uid_t);
#endif
*/
    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 */

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

#endif

#ifdef __WIN__
static my_bool is_NT(void)
{
  char *os=getenv("OS");
  return (os && !strcmp(os, "Windows_NT")) ? 1 : 0;
}
#endif

/*
** Expand wildcard to a sql string
*/

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



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

void STDCALL
mysql_debug(const char *debug)
{
#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
}

/**************************************************************************
** Shut down connection
**************************************************************************/

static void
end_server(MYSQL *mysql)
{
  DBUG_ENTER("end_server");
  if (mysql->net.vio != 0)
  {
    end_embedded_connection(&mysql->net);
    mysql->net.vio= 0;          /* Marker */
  }
  net_end(&mysql->net);
  free_old_query(mysql);
  DBUG_VOID_RETURN;
}


void STDCALL
mysql_free_result(MYSQL_RES *result)
{
  DBUG_ENTER("mysql_free_result");
  DBUG_PRINT("enter",("mysql_res: %lx",result));
  if (result)
  {
    if (result->handle && result->handle->status == MYSQL_STATUS_USE_RESULT)
    {
      DBUG_PRINT("warning",("Not all rows in set were read; Ignoring rows"));
      for (;;)
      {
	uint pkt_len;
	if ((pkt_len=(uint) net_safe_read(result->handle)) == packet_error)
	  break;
	if (pkt_len == 1 && result->handle->net.read_pos[0] == 254)
	  break;				/* End of data */
      }
      result->handle->status=MYSQL_STATUS_READY;
    }
    free_rows(result->data);
    if (result->fields)
      free_root(&result->field_alloc,MYF(0));
    if (result->row)
      my_free((gptr) result->row,MYF(0));
    my_free((gptr) result,MYF(0));
  }
  DBUG_VOID_RETURN;
}


/****************************************************************************
** Get options from my.cnf
****************************************************************************/

static const char *default_options[]=
{"port","socket","compress","password","pipe", "timeout", "user",
 "init-command", "host", "database", "debug", "return-found-rows",
 "ssl_key" ,"ssl_cert" ,"ssl_ca" ,"ssl_capath",
 "character-set-dir", "default-character-set",
 NullS
};

static TYPELIB option_types={array_elements(default_options)-1,
			     "options",default_options};

static void mysql_read_default_options(struct st_mysql_options *options,
				       const char *filename,const char *group)
{
  int argc;
  char *argv_buff[1],**argv;
  const char *groups[3];
  DBUG_ENTER("mysql_read_default_options");
  DBUG_PRINT("enter",("file: %s  group: %s",filename,group ? group :"NULL"));

  argc=1; argv=argv_buff; argv_buff[0]= (char*) "client";
  groups[0]= (char*) "client"; groups[1]= (char*) group; groups[2]=0;

  load_defaults(filename, groups, &argc, &argv);
  if (argc != 1)				/* If some default option */
  {
    char **option=argv;
    while (*++option)
    {
      /* DBUG_PRINT("info",("option: %s",option[0])); */
      if (option[0][0] == '-' && option[0][1] == '-')
      {
	char *end=strcend(*option,'=');
	char *opt_arg=0;
	if (*end)
	{
	  opt_arg=end+1;
	  *end=0;				/* Remove '=' */
	}
	switch (find_type(*option+2,&option_types,2)) {
	case 1:				/* port */
	  if (opt_arg)
	    options->port=atoi(opt_arg);
	  break;
	case 2:				/* socket */
	  if (opt_arg)
	  {
	    my_free(options->unix_socket,MYF(MY_ALLOW_ZERO_PTR));
	    options->unix_socket=my_strdup(opt_arg,MYF(MY_WME));
	  }
	  break;
	case 3:				/* compress */
	  options->compress=1;
	  break;
	case 4:				/* password */
	  if (opt_arg)
	  {
	    my_free(options->password,MYF(MY_ALLOW_ZERO_PTR));
	    options->password=my_strdup(opt_arg,MYF(MY_WME));
	  }
	  break;
	case 5:				/* pipe */
	  options->named_pipe=1;	/* Force named pipe */
	  break;
	case 6:				/* timeout */
	  if (opt_arg)
	    options->connect_timeout=atoi(opt_arg);
	  break;
	case 7:				/* user */
	  if (opt_arg)
	  {
	    my_free(options->user,MYF(MY_ALLOW_ZERO_PTR));
	    options->user=my_strdup(opt_arg,MYF(MY_WME));
	  }
	  break;
	case 8:				/* init-command */
	  if (opt_arg)
	  {
	    my_free(options->init_command,MYF(MY_ALLOW_ZERO_PTR));
	    options->init_command=my_strdup(opt_arg,MYF(MY_WME));
	  }
	  break;
	case 9:				/* host */
	  if (opt_arg)
	  {
	    my_free(options->host,MYF(MY_ALLOW_ZERO_PTR));
	    options->host=my_strdup(opt_arg,MYF(MY_WME));
	  }
	  break;
	case 10:			/* database */
	  if (opt_arg)
	  {
	    my_free(options->db,MYF(MY_ALLOW_ZERO_PTR));
	    options->db=my_strdup(opt_arg,MYF(MY_WME));
	  }
	  break;
	case 11:			/* debug */
	  mysql_debug(opt_arg ? opt_arg : "d:t:o,/tmp/client.trace");
	  break;
	case 12:			/* return-found-rows */
	  options->client_flag|=CLIENT_FOUND_ROWS;
	  break;
	case 13:				/* Ignore SSL options */
	case 14:
	case 15:
	case 16:
	  break;
	case 17:			/* charset-lib */
	  my_free(options->charset_dir,MYF(MY_ALLOW_ZERO_PTR));
          options->charset_dir = my_strdup(opt_arg, MYF(MY_WME));
	  break;
	case 18:
	  my_free(options->charset_name,MYF(MY_ALLOW_ZERO_PTR));
          options->charset_name = my_strdup(opt_arg, MYF(MY_WME));
	  break;
	default:
	  DBUG_PRINT("warning",("unknown option: %s",option[0]));
	}
      }
    }
  }
  free_defaults(argv);
  DBUG_VOID_RETURN;
}


/***************************************************************************
** Change field rows to field structs
***************************************************************************/

static MYSQL_FIELD *
unpack_fields(MYSQL_DATA *data,MEM_ROOT *alloc,uint fields,
	      my_bool default_value, my_bool long_flag_protocol)
{
  MYSQL_ROWS	*row;
  MYSQL_FIELD	*field,*result;
  DBUG_ENTER("unpack_fields");

  field=result=(MYSQL_FIELD*) alloc_root(alloc,sizeof(MYSQL_FIELD)*fields);
  if (!result)
    DBUG_RETURN(0);

  for (row=data->data; row ; row = row->next,field++)
  {
    field->table=  strdup_root(alloc,(char*) row->data[0]);
    field->name=   strdup_root(alloc,(char*) row->data[1]);
    field->length= (uint) uint3korr(row->data[2]);
    field->type=   (enum enum_field_types) (uchar) row->data[3][0];
    if (long_flag_protocol)
    {
      field->flags=   uint2korr(row->data[4]);
      field->decimals=(uint) (uchar) row->data[4][2];
    }
    else
    {
      field->flags=   (uint) (uchar) row->data[4][0];
      field->decimals=(uint) (uchar) row->data[4][1];
    }
    if (INTERNAL_NUM_FIELD(field))
      field->flags|= NUM_FLAG;
    if (default_value && row->data[5])
      field->def=strdup_root(alloc,(char*) row->data[5]);
    else
      field->def=0;
    field->max_length= 0;
  }
  free_rows(data);				/* Free old data */
  DBUG_RETURN(result);
}


/* Read all rows (fields or data) from server */

static MYSQL_DATA *read_rows(MYSQL *mysql,MYSQL_FIELD *mysql_fields,
			     uint fields)
{
  uint	field,pkt_len;
  ulong len;
  uchar *cp;
  char	*to;
  MYSQL_DATA *result;
  MYSQL_ROWS **prev_ptr,*cur;
  NET *net = &mysql->net;
  DBUG_ENTER("read_rows");

  if ((pkt_len=(uint) net_safe_read(mysql)) == packet_error)
    DBUG_RETURN(0);
  if (!(result=(MYSQL_DATA*) my_malloc(sizeof(MYSQL_DATA),
				       MYF(MY_WME | MY_ZEROFILL))))
  {
    net->last_errno=CR_OUT_OF_MEMORY;
    strmov(net->last_error,ER(net->last_errno));
    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;
  result->fields=fields;

  while (*(cp=net->read_pos) != 254 || pkt_len != 1)
  {
    result->rows++;
    if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,
					    sizeof(MYSQL_ROWS))) ||
	!(cur->data= ((MYSQL_ROW)
		      alloc_root(&result->alloc,
				     (fields+1)*sizeof(char *)+pkt_len))))
    {
      free_rows(result);
      net->last_errno=CR_OUT_OF_MEMORY;
      strmov(net->last_error,ER(net->last_errno));
      DBUG_RETURN(0);
    }
    *prev_ptr=cur;
    prev_ptr= &cur->next;
    to= (char*) (cur->data+fields+1);
    for (field=0 ; field < fields ; field++)
    {
      if ((len=(ulong) net_field_length(&cp)) == NULL_LENGTH)
      {						/* null field */
	cur->data[field] = 0;
      }
      else
      {
	cur->data[field] = to;
	memcpy(to,(char*) cp,len); to[len]=0;
	to+=len+1;
	cp+=len;
	if (mysql_fields)
	{
	  if (mysql_fields[field].max_length < len)
	    mysql_fields[field].max_length=len;
	}
      }
    }
    cur->data[field]=to;			/* End of last field */
    if ((pkt_len=net_safe_read(mysql)) == packet_error)
    {
      free_rows(result);
      DBUG_RETURN(0);
    }
  }
  *prev_ptr=0;					/* last pointer is null */
  DBUG_PRINT("exit",("Got %d rows",result->rows));
  DBUG_RETURN(result);
}


/*
** Read one row. Uses packet buffer as storage for fields.
** When next packet is read, the previous field values are destroyed
*/


static int
read_one_row(MYSQL *mysql,uint fields,MYSQL_ROW row, ulong *lengths)
{
  uint field;
  ulong pkt_len,len;
  uchar *pos,*prev_pos;

  if ((pkt_len=(uint) net_safe_read(mysql)) == packet_error)
    return -1;
  if (pkt_len == 1 && mysql->net.read_pos[0] == 254)
    return 1;				/* End of data */
  prev_pos= 0;				/* allowed to write at packet[-1] */
  pos=mysql->net.read_pos;
  for (field=0 ; field < fields ; field++)
  {
    if ((len=(ulong) net_field_length(&pos)) == NULL_LENGTH)
    {						/* null field */
      row[field] = 0;
      *lengths++=0;
    }
    else
    {
      row[field] = (char*) pos;
      pos+=len;
      *lengths++=len;
    }
    if (prev_pos)
      *prev_pos=0;				/* Terminate prev field */
    prev_pos=pos;
  }
  row[field]=(char*) prev_pos+1;		/* End of last field */
  *prev_pos=0;					/* Terminate last field */
  return 0;
}

/* perform query on master */
int STDCALL mysql_master_query(MYSQL *mysql, const char *q,
					unsigned int length)
{
  if(mysql_master_send_query(mysql, q, length))
    return 1;
  return mysql_read_query_result(mysql);
}

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


/* perform query on slave */  
int STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
					unsigned int length)
{
  if(mysql_slave_send_query(mysql, q, length))
    return 1;
  return mysql_read_query_result(mysql);
}

int STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
					unsigned int length)
{
  MYSQL* last_used_slave, *slave_to_use = 0;
  
  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(!length)
    length = strlen(q);
  if(!slave_to_use->net.vio && !mysql_real_connect(slave_to_use, 0,0,0,
						   0,0,0,0))
    return 1;
  return simple_command(slave_to_use, COM_QUERY, q, length, 1);
}


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

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

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

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

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

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

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

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

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

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

  switch (mysql_num_fields(res))
  {
  case 3: has_auth_info = 0; break;
  case 5: has_auth_info = 1; break;
  default:
    goto err;
  }

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

    if (has_auth_info)
    {
      tmp_user = row[3];
      tmp_pass = row[4];
    }
    else
    {
      tmp_user = mysql->user;
      tmp_pass = mysql->passwd;
    }

    if(!(slave = spawn_init(mysql, row[1], atoi(row[2]),
			    tmp_user, tmp_pass)))
      goto err;
      
    /* Now add slave into the circular linked list */
    slave->next_slave = mysql->next_slave;
    mysql->next_slave = slave;
  }
  error = 0;
err:
  if(res)
   mysql_free_result(res);
  return error;
}

int STDCALL mysql_rpl_probe(MYSQL* mysql)
{
  MYSQL_RES* res = 0;
  MYSQL_ROW row;
  int error = 1;
  /* first determine the replication role of the server we connected to
     the most reliable way to do this is to run SHOW SLAVE STATUS and see
     if we have a non-empty master host. This is still not fool-proof -
     it is not a sin to have a master that has a dormant slave thread with
     a non-empty master host. However, it is more reliable to check 
     for empty master than whether the slave thread is actually running
  */
  if (mysql_query(mysql, "SHOW SLAVE STATUS") ||
     !(res = mysql_store_result(mysql)))
  {
    expand_error(mysql, CR_PROBE_SLAVE_STATUS);
    return 1;
  }
  
  if (!(row = mysql_fetch_row(res)))
    goto err;

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

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


/* make a not so fool-proof decision on where the query should go, to
   the master or the slave. Ideally the user should always make this
   decision himself with mysql_master_query() or mysql_slave_query().
   However, to be able to more easily port the old code, we support the
   option of an educated guess - this should work for most applications,
   however, it may make the wrong decision in some particular cases. If
   that happens, the user would have to change the code to call
   mysql_master_query() or mysql_slave_query() explicitly in the place
   where we have made the wrong decision
*/
enum mysql_rpl_type
STDCALL mysql_rpl_query_type(const char* q, int len)
{
  const char* q_end;
  q_end = (len) ? q + len : strend(q);
  for(; q < q_end; ++q)
  {
    char c;
    if(isalpha(c=*q))
      switch(tolower(c))
       {
       case 'i':  /* insert */
       case 'u':  /* update or unlock tables */
       case 'l':  /* lock tables or load data infile */
       case 'd':  /* drop or delete */
       case 'a':  /* alter */
	 return MYSQL_RPL_MASTER;
       case 'c':  /* create or check */
	 return tolower(q[1]) == 'h' ? MYSQL_RPL_ADMIN : MYSQL_RPL_MASTER ;
       case 's': /* select or show */
	 return tolower(q[1] == 'h') ? MYSQL_RPL_ADMIN : MYSQL_RPL_SLAVE;
       case 'f': /* flush */
       case 'r': /* repair */
       case 'g': /* grant */
	 return MYSQL_RPL_ADMIN;
       default:
	 return MYSQL_RPL_SLAVE;
       }
  }

  return 0;
}

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

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

/****************************************************************************
** Init MySQL structure or allocate one
****************************************************************************/

MYSQL * STDCALL
mysql_init(MYSQL *mysql)
{
  mysql_once_init();
  if (!mysql)
  {
    if (!(mysql=(MYSQL*) my_malloc(sizeof(*mysql),MYF(MY_WME | MY_ZEROFILL))))
      return 0;
    mysql->free_me=1;
    mysql->net.vio = 0;
  }
  else
    bzero((char*) (mysql),sizeof(*(mysql)));
  return mysql;
}


static void mysql_once_init()
{
  if (!mysql_client_init)
  {
    mysql_client_init=1;
    my_init();					/* Will init threads */
    init_client_errs();
    mysql_port = MYSQL_PORT;
    mysql_debug(NullS);
  }
#ifdef THREAD
  else
    my_thread_init();         /* Init if new thread */
#endif
}

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

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


/*
** Note that the mysql argument must be initialized with mysql_init()
** before calling mysql_real_connect !
*/

MYSQL * STDCALL
mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
		   const char *passwd, const char *db,
		   uint port, const char *unix_socket,uint client_flag)
{
  char		buff[100],charset_name_buff[16],*end,*host_info, *charset_name;
  uint		pkt_length;
  NET		*net= &mysql->net;
  DBUG_ENTER("mysql_real_connect");
  DBUG_PRINT("enter",("host: %s  db: %s  user: %s",
		      host ? host : "(Null)",
		      db ? db : "(Null)",
		      user ? user : "(Null)"));

  net->vio = 0;				/* If something goes wrong */
  /* use default options */
  if (mysql->options.my_cnf_file || mysql->options.my_cnf_group)
  {
    mysql_read_default_options(&mysql->options,
			       (mysql->options.my_cnf_file ?
				mysql->options.my_cnf_file : "my"),
			       mysql->options.my_cnf_group);
    my_free(mysql->options.my_cnf_file,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.my_cnf_group,MYF(MY_ALLOW_ZERO_PTR));
    mysql->options.my_cnf_file=mysql->options.my_cnf_group=0;
  }

  /* Some empty-string-tests are done because of ODBC */
  if (!host || !host[0])
    host=mysql->options.host;
  if (!user || !user[0])
    user=mysql->options.user;
  if (!passwd)
  {
    passwd=mysql->options.password;
  }
  if (!db || !db[0])
    db=mysql->options.db;
  port=0;
  unix_socket=0;
  mysql->reconnect=1;			/* Reconnect as default */
  mysql->server_status=SERVER_STATUS_AUTOCOMMIT;
  host_info=(char*) ER(CR_EMBEDDED_CONNECTION);
  if (my_net_init(net, net->vio))
  {
    vio_delete(net->vio);
    net->last_errno=CR_OUT_OF_MEMORY;
    strmov(net->last_error,ER(net->last_errno));
    goto error;
  }

  /* Get version info */
  mysql->protocol_version= PROTOCOL_VERSION;	/* Assume this */
  start_embedded_connection(net);

  if ((pkt_length=net_safe_read(mysql)) == packet_error)
    goto error;

  /* Check if version of protocoll matches current one */

  mysql->protocol_version= net->read_pos[0];
  DBUG_DUMP("packet",(char*) net->read_pos,10);
  DBUG_PRINT("info",("mysql protocol version %d, server=%d",
		     PROTOCOL_VERSION, mysql->protocol_version));
  if (mysql->protocol_version != PROTOCOL_VERSION &&
      mysql->protocol_version != PROTOCOL_VERSION-1)
  {
    net->last_errno= CR_VERSION_ERROR;
    sprintf(net->last_error, ER(CR_VERSION_ERROR), mysql->protocol_version,
	    PROTOCOL_VERSION);
    goto error;
  }
  end=strend((char*) net->read_pos+1);
  mysql->thread_id=uint4korr(end+1);
  end+=5;
  strmake(mysql->scramble_buff,end,8);
  end+=9;
  if (pkt_length >= (uint) (end+1 - (char*) net->read_pos))
    mysql->server_capabilities=uint2korr(end);
  if (pkt_length >= (uint) (end+18 - (char*) net->read_pos))
  {
    /* New protocol with 16 bytes to describe server characteristics */
    mysql->server_language=end[2];
    mysql->server_status=uint2korr(end+3);
  }

  /* Set character set */
  if ((charset_name=mysql->options.charset_name))
  {
    const char *save=charsets_dir;
    if (mysql->options.charset_dir)
      charsets_dir=mysql->options.charset_dir;
    mysql->charset=get_charset_by_name(mysql->options.charset_name,
                                       MYF(MY_WME));
    charsets_dir=save;
  }
  else if (mysql->server_language)
  {
    charset_name=charset_name_buff;
    sprintf(charset_name,"%d",mysql->server_language);	/* In case of errors */
    mysql->charset=get_charset((uint8) mysql->server_language, MYF(MY_WME));
  }
  else
    mysql->charset=default_charset_info;

  if (!mysql->charset)
  {
    net->last_errno=CR_CANT_READ_CHARSET;
    if (mysql->options.charset_dir)
      sprintf(net->last_error,ER(net->last_errno),
              charset_name ? charset_name : "unknown",
              mysql->options.charset_dir);
    else
    {
      char cs_dir_name[FN_REFLEN];
      get_charsets_dir(cs_dir_name);
      sprintf(net->last_error,ER(net->last_errno),
              charset_name ? charset_name : "unknown",
              cs_dir_name);
    }
    goto error;
  }

  /* Save connection information */
  if (!user) user="";
  if (!passwd) passwd="";
  host=LOCAL_HOST;
  if (!my_multi_malloc(MYF(0),
		       &mysql->host_info, (uint) strlen(host_info)+1,
		       &mysql->host,      (uint) strlen(host)+1,
		       &mysql->unix_socket,unix_socket ?
		       (uint) strlen(unix_socket)+1 : (uint) 1,
		       &mysql->server_version,
		       (uint) (end - (char*) net->read_pos),
		       NullS) ||
      !(mysql->user=my_strdup(user,MYF(0))) ||
      !(mysql->passwd=my_strdup(passwd,MYF(0))))
  {
    strmov(net->last_error, ER(net->last_errno=CR_OUT_OF_MEMORY));
    goto error;
  }
  strmov(mysql->host_info,host_info);
  strmov(mysql->host,host);
  if (unix_socket)
    strmov(mysql->unix_socket,unix_socket);
  else
    mysql->unix_socket=0;
  strmov(mysql->server_version,(char*) net->read_pos+1);
  mysql->port=port;
  mysql->client_flag=client_flag | mysql->options.client_flag;
  DBUG_PRINT("info",("Server version = '%s'  capabilites: %ld  status: %d",
		     mysql->server_version,mysql->server_capabilities,
		     mysql->server_status));

  /* Send client information for access check */
  client_flag|=CLIENT_CAPABILITIES;
  client_flag&= ~CLIENT_COMPRESS;
  if (db)
    client_flag|=CLIENT_CONNECT_WITH_DB;
  int2store(buff,client_flag);
  mysql->client_flag=client_flag;


  int3store(buff+2,max_allowed_packet);
  if (user && user[0])
    strmake(buff+5,user,32);
  else
    read_user_name((char*) buff+5);
#ifdef _CUSTOMCONFIG_
#include "_cust_libmysql.h";
#endif
  DBUG_PRINT("info",("user: %s",buff+5));
  end=scramble(strend(buff+5)+1, mysql->scramble_buff, passwd,
	       (my_bool) (mysql->protocol_version == 9));

  if (db)
  {
    end=strmov(end+1,db);
    mysql->db=my_strdup(db,MYF(MY_WME));
    db=0;
  }
  if (my_net_write(net,buff,(uint) (end-buff)) || net_flush(net))
    goto error;
	
  lib_connection_phase(net,2);
   
  if( net_safe_read(mysql) == packet_error)
    goto error;
  if (db && mysql_select_db(mysql,db))
    goto error;
  if (mysql->options.init_command)
  {
    my_bool reconnect=mysql->reconnect;
    mysql->reconnect=0;
    if (mysql_query(mysql,mysql->options.init_command))
      goto error;
    mysql_free_result(mysql_use_result(mysql));
    mysql->reconnect=reconnect;
  }

  DBUG_PRINT("exit",("Mysql handler: %lx",mysql));
  reset_sigpipe(mysql);
  DBUG_RETURN(mysql);

error:
  reset_sigpipe(mysql);
  DBUG_PRINT("error",("message: %u (%s)",net->last_errno,net->last_error));
  {
    /* Free alloced memory */
    my_bool free_me=mysql->free_me;
    end_server(mysql);
    mysql->free_me=0;
    mysql_close(mysql);
    mysql->free_me=free_me;
  }
  DBUG_RETURN(0);
}


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

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

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

  pos=strmov(pos,user)+1;
  pos=scramble(pos, mysql->scramble_buff, passwd,
	       (my_bool) (mysql->protocol_version == 9));
  pos=strmov(pos+1,db ? db : "");
  if (simple_command(mysql,COM_CHANGE_USER, buff,(uint) (pos-buff),0))
    DBUG_RETURN(1);

  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));

  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);
}


/**************************************************************************
** Set current database
**************************************************************************/

int STDCALL
mysql_select_db(MYSQL *mysql, const char *db)
{
  int error;
  DBUG_ENTER("mysql_select_db");
  DBUG_PRINT("enter",("db: '%s'",db));

  if ((error=simple_command(mysql,COM_INIT_DB,db,(uint) strlen(db),0)))
    DBUG_RETURN(error);
  my_free(mysql->db,MYF(MY_ALLOW_ZERO_PTR));
  mysql->db=my_strdup(db,MYF(MY_WME));
  DBUG_RETURN(0);
}


/*************************************************************************
** Send a QUIT to the server and close the connection
** If handle is alloced by mysql connect free it.
*************************************************************************/

void STDCALL
mysql_close(MYSQL *mysql)
{
  DBUG_ENTER("mysql_close");
  if (mysql)					/* Some simple safety */
  {
    if (mysql->net.vio != 0)
    {
      free_old_query(mysql);
      mysql->status=MYSQL_STATUS_READY; /* Force command */
      simple_command(mysql,COM_QUIT,"",0,1);
      end_server(mysql);
    }
    my_free((gptr) mysql->host_info,MYF(MY_ALLOW_ZERO_PTR));
    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));
    my_free(mysql->options.init_command,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.user,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.host,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.password,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.unix_socket,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.db,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.my_cnf_file,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.my_cnf_group,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.charset_dir,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->options.charset_name,MYF(MY_ALLOW_ZERO_PTR));
    /* Clear pointers for better safety */
    mysql->host_info=mysql->user=mysql->passwd=mysql->db=0;
    bzero((char*) &mysql->options,sizeof(mysql->options));
    mysql->net.vio = 0;
#ifdef HAVE_OPENSSL
    ((VioConnectorFd*)(mysql->connector_fd))->delete();
    mysql->connector_fd = 0;
#endif /* HAVE_OPENSSL */
    if (mysql->free_me)
      my_free((gptr) mysql,MYF(0));
  }
  DBUG_VOID_RETURN;
}


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

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

int STDCALL
mysql_send_query(MYSQL* mysql, const char* query, uint length)
{
  return simple_command(mysql, COM_QUERY, query, length, 1);
}


int STDCALL
mysql_read_query_result(MYSQL *mysql)
{
  uchar *pos;
  ulong field_count;
  MYSQL_DATA *fields;
  uint length;
  DBUG_ENTER("mysql_read_query_result");

  if ((length=net_safe_read(mysql)) == packet_error)
    DBUG_RETURN(-1);
  free_old_query(mysql);			/* Free old result */
get_info:
  pos=(uchar*) mysql->net.read_pos;
  if ((field_count= net_field_length(&pos)) == 0)
  {
    mysql->affected_rows= net_field_length_ll(&pos);
    mysql->insert_id=	  net_field_length_ll(&pos);
    if (mysql->server_capabilities & CLIENT_TRANSACTIONS)
    {
      mysql->server_status=uint2korr(pos); pos+=2;
    }
    if (pos < mysql->net.read_pos+length && net_field_length(&pos))
      mysql->info=(char*) pos;
    DBUG_RETURN(0);
  }
  if (field_count == NULL_LENGTH)		/* LOAD DATA LOCAL INFILE */
  {
    int error=send_file_to_server(mysql,(char*) pos);
    if ((length=net_safe_read(mysql)) == packet_error || error)
      DBUG_RETURN(-1);
    goto get_info;				/* Get info packet */
  }
  if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
    mysql->server_status|= SERVER_STATUS_IN_TRANS;

  mysql->extra_info= net_field_length_ll(&pos); /* Maybe number of rec */
  if (!(fields=read_rows(mysql,(MYSQL_FIELD*) 0,5)))
    DBUG_RETURN(-1);
  if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,
				    (uint) field_count,0,
				    (my_bool) test(mysql->server_capabilities &
						   CLIENT_LONG_FLAG))))
    DBUG_RETURN(-1);
  mysql->status=MYSQL_STATUS_GET_RESULT;
  mysql->field_count=field_count;
  DBUG_RETURN(0);
}

int STDCALL
mysql_real_query(MYSQL *mysql, const char *query, uint length)
{
  DBUG_ENTER("mysql_real_query");
  DBUG_PRINT("enter",("handle: %lx",mysql));
  DBUG_PRINT("query",("Query = \"%s\"",query));
  if (mysql_send_query(mysql, query, length))
    DBUG_RETURN(-1);
  DBUG_RETURN(mysql_read_query_result(mysql));
}


static int
send_file_to_server(MYSQL *mysql, const char *filename)
{
  int fd, readcount;
  char buf[IO_SIZE*15],*tmp_name;
  DBUG_ENTER("send_file_to_server");

  fn_format(buf,filename,"","",4);		/* Convert to client format */
  if (!(tmp_name=my_strdup(buf,MYF(0))))
  {
    strmov(mysql->net.last_error, ER(mysql->net.last_errno=CR_OUT_OF_MEMORY));
    DBUG_RETURN(-1);
  }
  if ((fd = my_open(tmp_name,O_RDONLY, MYF(0))) < 0)
  {
    mysql->net.last_errno=EE_FILENOTFOUND;
    sprintf(buf,EE(mysql->net.last_errno),tmp_name,errno);
    strmake(mysql->net.last_error,buf,sizeof(mysql->net.last_error)-1);
    my_net_write(&mysql->net,"",0); net_flush(&mysql->net);
    my_free(tmp_name,MYF(0));
    DBUG_RETURN(-1);
  }

  while ((readcount = (int) my_read(fd,buf,sizeof(buf),MYF(0))) > 0)
  {
    if (my_net_write(&mysql->net,buf,readcount))
    {
      mysql->net.last_errno=CR_SERVER_LOST;
      strmov(mysql->net.last_error,ER(mysql->net.last_errno));
      DBUG_PRINT("error",("Lost connection to MySQL server during LOAD DATA of local file"));
      (void) my_close(fd,MYF(0));
      my_free(tmp_name,MYF(0));
      DBUG_RETURN(-1);
    }
  }
  (void) my_close(fd,MYF(0));
  /* Send empty packet to mark end of file */
  if (my_net_write(&mysql->net,"",0) || net_flush(&mysql->net))
  {
    mysql->net.last_errno=CR_SERVER_LOST;
    sprintf(mysql->net.last_error,ER(mysql->net.last_errno),errno);
    my_free(tmp_name,MYF(0));
    DBUG_RETURN(-1);
  }
  if (readcount < 0)
  {
    mysql->net.last_errno=EE_READ; /* the errmsg for not entire file read */
    sprintf(buf,EE(mysql->net.last_errno),tmp_name,errno);
    strmake(mysql->net.last_error,buf,sizeof(mysql->net.last_error)-1);
    my_free(tmp_name,MYF(0));
    DBUG_RETURN(-1);
  }
  DBUG_RETURN(0);
}


/**************************************************************************
** Alloc result struct for buffered results. All rows are read to buffer.
** mysql_data_seek may be used.
**************************************************************************/

MYSQL_RES * STDCALL
mysql_store_result(MYSQL *mysql)
{
  MYSQL_RES *result;
  DBUG_ENTER("mysql_store_result");

  if (!mysql->fields)
    DBUG_RETURN(0);
  if (mysql->status != MYSQL_STATUS_GET_RESULT)
  {
    strmov(mysql->net.last_error,
	   ER(mysql->net.last_errno=CR_COMMANDS_OUT_OF_SYNC));
    DBUG_RETURN(0);
  }
  mysql->status=MYSQL_STATUS_READY;		/* server is ready */
  if (!(result=(MYSQL_RES*) my_malloc(sizeof(MYSQL_RES)+
				      sizeof(ulong)*mysql->field_count,
				      MYF(MY_WME | MY_ZEROFILL))))
  {
    mysql->net.last_errno=CR_OUT_OF_MEMORY;
    strmov(mysql->net.last_error, ER(mysql->net.last_errno));
    DBUG_RETURN(0);
  }
  result->eof=1;				/* Marker for buffered */
  result->lengths=(ulong*) (result+1);
  if (!(result->data=read_rows(mysql,mysql->fields,mysql->field_count)))
  {
    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=	mysql->fields;
  result->field_alloc=	mysql->field_alloc;
  result->field_count=	mysql->field_count;
  result->current_field=0;
  result->current_row=0;			/* Must do a fetch first */
  mysql->fields=0;				/* fields is now in result */
  DBUG_RETURN(result);				/* Data fetched */
}


/**************************************************************************
** Alloc struct for use with unbuffered reads. Data is fetched by domand
** when calling to mysql_fetch_row.
** mysql_data_seek is a noop.
**
** No other queries may be specified with the same MYSQL handle.
** There shouldn't be much processing per row because mysql server shouldn't
** have to wait for the client (and will not wait more than 30 sec/packet).
**************************************************************************/

MYSQL_RES * STDCALL
mysql_use_result(MYSQL *mysql)
{
  MYSQL_RES *result;
  DBUG_ENTER("mysql_use_result");

  if (!mysql->fields)
    DBUG_RETURN(0);
  if (mysql->status != MYSQL_STATUS_GET_RESULT)
  {
    strmov(mysql->net.last_error,
	   ER(mysql->net.last_errno=CR_COMMANDS_OUT_OF_SYNC));
    DBUG_RETURN(0);
  }
  if (!(result=(MYSQL_RES*) my_malloc(sizeof(*result)+
				      sizeof(ulong)*mysql->field_count,
				      MYF(MY_WME | MY_ZEROFILL))))
    DBUG_RETURN(0);
  result->lengths=(ulong*) (result+1);
  if (!(result->row=(MYSQL_ROW)
	my_malloc(sizeof(result->row[0])*(mysql->field_count+1), MYF(MY_WME))))
  {					/* Ptrs: to one row */
    my_free((gptr) result,MYF(0));
    DBUG_RETURN(0);
  }
  result->fields=	mysql->fields;
  result->field_alloc=	mysql->field_alloc;
  result->field_count=	mysql->field_count;
  result->current_field=0;
  result->handle=	mysql;
  result->current_row=	0;
  mysql->fields=0;			/* fields is now in result */
  mysql->status=MYSQL_STATUS_USE_RESULT;
  DBUG_RETURN(result);			/* Data is read to be fetched */
}



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

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


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

MYSQL_ROW STDCALL
mysql_fetch_row(MYSQL_RES *res)
{
  DBUG_ENTER("mysql_fetch_row");
  if (!res->data)
  {						/* Unbufferred fetch */
    if (!res->eof)
    {
      if (!(read_one_row(res->handle,res->field_count,res->row, res->lengths)))
      {
	res->row_count++;
	DBUG_RETURN(res->current_row=res->row);
      }
      else
      {
	DBUG_PRINT("info",("end of data"));
	res->eof=1;
	res->handle->status=MYSQL_STATUS_READY;
      }
    }
    DBUG_RETURN((MYSQL_ROW) NULL);
  }
  {
    MYSQL_ROW tmp;
    if (!res->data_cursor)
    {
      DBUG_PRINT("info",("end of data"));
      DBUG_RETURN(res->current_row=(MYSQL_ROW) NULL);
    }
    tmp = res->data_cursor->data;
    res->data_cursor = res->data_cursor->next;
    DBUG_RETURN(res->current_row=tmp);
  }
}

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

ulong * STDCALL
mysql_fetch_lengths(MYSQL_RES *res)
{
  ulong *lengths,*prev_length;
  byte *start;
  MYSQL_ROW column,end;

  if (!(column=res->current_row))
    return 0;					/* Something is wrong */
  if (res->data)
  {
    start=0;
    prev_length=0;				/* Keep gcc happy */
    lengths=res->lengths;
    for (end=column+res->field_count+1 ; column != end ; column++,lengths++)
    {
      if (!*column)
      {
	*lengths=0;				/* Null */
	continue;
      }
      if (start)				/* Found end of prev string */
	*prev_length= (uint) (*column-start-1);
      start= *column;
      prev_length=lengths;
    }
  }
  return res->lengths;
}

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

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

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

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


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

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

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

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


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

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

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


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

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

  LINT_INIT(query);

  end=strmake(strmake(buff, table,128)+1,wild ? wild : "",128);
  if (simple_command(mysql,COM_FIELD_LIST,buff,(uint) (end-buff),1) ||
      !(query = read_rows(mysql,(MYSQL_FIELD*) 0,6)))
    DBUG_RETURN(NULL);

  free_old_query(mysql);
  if (!(result = (MYSQL_RES *) my_malloc(sizeof(MYSQL_RES),
					 MYF(MY_WME | MY_ZEROFILL))))
  {
    free_rows(query);
    DBUG_RETURN(NULL);
  }
  result->field_alloc=mysql->field_alloc;
  mysql->fields=0;
  result->field_count = (uint) query->rows;
  result->fields= unpack_fields(query,&result->field_alloc,
				result->field_count,1,
				(my_bool) test(mysql->server_capabilities &
					       CLIENT_LONG_FLAG));
  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))
    DBUG_RETURN(0);
  free_old_query(mysql);
  pos=(uchar*) mysql->net.read_pos;
  field_count=(uint) net_field_length(&pos);
  if (!(fields = read_rows(mysql,(MYSQL_FIELD*) 0,5)))
    DBUG_RETURN(NULL);
  if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,field_count,0,
				    (my_bool) test(mysql->server_capabilities &
						   CLIENT_LONG_FLAG))))
    DBUG_RETURN(0);
  mysql->status=MYSQL_STATUS_GET_RESULT;
  mysql->field_count=field_count;
  DBUG_RETURN(mysql_store_result(mysql));
}


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


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


int STDCALL
mysql_shutdown(MYSQL *mysql)
{
  DBUG_ENTER("mysql_shutdown");
  DBUG_RETURN(simple_command(mysql,COM_SHUTDOWN,"",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)
{
  char buff[12];
  DBUG_ENTER("mysql_kill");
  int4store(buff,pid);
  DBUG_RETURN(simple_command(mysql,COM_PROCESS_KILL,buff,4,0));
}


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

char * STDCALL
mysql_stat(MYSQL *mysql)
{
  DBUG_ENTER("mysql_stat");
  if (simple_command(mysql,COM_STATISTICS,"",0,0))
    return mysql->net.last_error;
  mysql->net.read_pos[mysql->packet_length]=0;	/* End of stat string */
  if (!mysql->net.read_pos[0])
  {
    mysql->net.last_errno=CR_WRONG_HOST_INFO;
    strmov(mysql->net.last_error, ER(mysql->net.last_errno));
    return mysql->net.last_error;
  }
  DBUG_RETURN((char*) mysql->net.read_pos);
}


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


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


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


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

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


int STDCALL
mysql_options(MYSQL *mysql,enum mysql_option option, const char *arg)
{
  DBUG_ENTER("mysql_option");
  DBUG_PRINT("enter",("option: %d",(int) option));
  switch (option) {
  case MYSQL_OPT_CONNECT_TIMEOUT:
    mysql->options.connect_timeout= *(uint*) arg;
    break;
  case MYSQL_OPT_COMPRESS:
    mysql->options.compress=1;			/* Remember for connect */
    break;
  case MYSQL_OPT_NAMED_PIPE:
    mysql->options.named_pipe=1;		/* Force named pipe */
    break;
  case MYSQL_INIT_COMMAND:
    my_free(mysql->options.init_command,MYF(MY_ALLOW_ZERO_PTR));
    mysql->options.init_command=my_strdup(arg,MYF(MY_WME));
    break;
  case MYSQL_READ_DEFAULT_FILE:
    my_free(mysql->options.my_cnf_file,MYF(MY_ALLOW_ZERO_PTR));
    mysql->options.my_cnf_file=my_strdup(arg,MYF(MY_WME));
    break;
  case MYSQL_READ_DEFAULT_GROUP:
    my_free(mysql->options.my_cnf_group,MYF(MY_ALLOW_ZERO_PTR));
    mysql->options.my_cnf_group=my_strdup(arg,MYF(MY_WME));
    break;
  case MYSQL_SET_CHARSET_DIR:
    my_free(mysql->options.charset_dir,MYF(MY_ALLOW_ZERO_PTR));
    mysql->options.charset_dir=my_strdup(arg,MYF(MY_WME));
    break;
  case MYSQL_SET_CHARSET_NAME:
    my_free(mysql->options.charset_name,MYF(MY_ALLOW_ZERO_PTR));
    mysql->options.charset_name=my_strdup(arg,MYF(MY_WME));
    break;
  default:
    DBUG_RETURN(-1);
  }
  DBUG_RETURN(0);
}

/****************************************************************************
** Functions to get information from the MySQL structure
** These are functions to make shared libraries more usable.
****************************************************************************/

/* MYSQL_RES */
my_ulonglong STDCALL mysql_num_rows(MYSQL_RES *res)
{
  return res->row_count;
}

unsigned int STDCALL mysql_num_fields(MYSQL_RES *res)
{
  return res->field_count;
}

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

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

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

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

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

/* MYSQL */

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

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

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

uint STDCALL mysql_errno(MYSQL *mysql)
{
  return (mysql)->net.last_errno;
}

char * STDCALL mysql_error(MYSQL *mysql)
{
  return (mysql)->net.last_error;
}

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

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

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


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

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

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

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