/* Copyright (C) 2000-2003 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; 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,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

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


#include "mysql_priv.h"
#include <stdarg.h>

	/* Send a error string to client */

void send_error(NET *net, uint sql_errno, const char *err)
{
  uint length;
  char buff[MYSQL_ERRMSG_SIZE+2];
  THD *thd=current_thd;
  DBUG_ENTER("send_error");
  DBUG_PRINT("enter",("sql_errno: %d  err: %s", sql_errno,
		      err ? err : net->last_error[0] ?
		      net->last_error : "NULL")); 

  query_cache_abort(net);
  if (thd)
    thd->query_error = 1; // needed to catch query errors during replication
  if (!err)
  {
    if (sql_errno)
      err=ER(sql_errno);
    else
    {
      if ((err=net->last_error)[0])
	sql_errno=net->last_errno;
      else
      {
	sql_errno=ER_UNKNOWN_ERROR;
	err=ER(sql_errno);	 /* purecov: inspected */
      }
    }
  }
  if (net->vio == 0)
  {
    if (thd && thd->bootstrap)
    {
      /* In bootstrap it's ok to print on stderr */
      fprintf(stderr,"ERROR: %d  %s\n",sql_errno,err);
    }
    DBUG_VOID_RETURN;
  }

  if (net->return_errno)
  {				// new client code; Add errno before message
    int2store(buff,sql_errno);
    length= (uint) (strmake(buff+2,err,MYSQL_ERRMSG_SIZE-1) - buff);
    err=buff;
  }
  else
  {
    length=(uint) strlen(err);
    set_if_smaller(length,MYSQL_ERRMSG_SIZE);
  }
  VOID(net_write_command(net,(uchar) 255,(char*) err,length));
  if (thd)
    thd->fatal_error=0;			// Error message is given
  DBUG_VOID_RETURN;
}

/*
  At some point we need to be able to distinguish between warnings and
  errors; The following function will help make this easier.
*/

void send_warning(NET *net, uint sql_errno, const char *err)
{
  DBUG_ENTER("send_warning");
  send_error(net,sql_errno,err);
  DBUG_VOID_RETURN;
}


/*
   Write error package and flush to client
   It's a little too low level, but I don't want to allow another buffer
*/
/* VARARGS3 */

void
net_printf(NET *net, uint errcode, ...)
{
  va_list args;
  uint length,offset;
  const char *format,*text_pos;
  int head_length= NET_HEADER_SIZE;
  THD *thd=current_thd;
  DBUG_ENTER("net_printf");
  DBUG_PRINT("enter",("message: %u",errcode));

  if (thd)
    thd->query_error = 1;	// if we are here, something is wrong :-)
  query_cache_abort(net);	// Safety
  va_start(args,errcode);
  /*
    The following is needed to make net_printf() work with 0 argument for
    errorcode and use the argument after that as the format string. This
    is useful for rare errors that are not worth the hassle to put in
    errmsg.sys, but at the same time, the message is not fixed text
  */
  if (errcode)
    format= ER(errcode);
  else
  {
    format=va_arg(args,char*);
    errcode= ER_UNKNOWN_ERROR;
  }
  offset= net->return_errno ? 2 : 0;
  text_pos=(char*) net->buff+head_length+offset+1;
  (void) my_vsnprintf(my_const_cast(char*) (text_pos),
                      (char*)net->buff_end-text_pos,
                      format,args);
  length=(uint) strlen((char*) text_pos);
  if (length >= sizeof(net->last_error))
    length=sizeof(net->last_error)-1;		/* purecov: inspected */
  va_end(args);

  /* Replication slave relies on net->last_* to see if there was error */
  net->last_errno= errcode;
  strmake(net->last_error, text_pos, sizeof(net->last_error)-1);

  if (net->vio == 0)
  {
    if (thd && thd->bootstrap)
    {
      /*
	In bootstrap it's ok to print on stderr
	This may also happen when we get an error from a slave thread
      */
      fprintf(stderr,"ERROR: %d  %s\n",errcode,text_pos);
      thd->fatal_error=1;
    }
    DBUG_VOID_RETURN;
  }

  int3store(net->buff,length+1+offset);
  net->buff[3]= (net->compress) ? 0 : (uchar) (net->pkt_nr++);
  net->buff[head_length]=(uchar) 255;		// Error package
  if (offset)
    int2store(text_pos-2, errcode);
  VOID(net_real_write(net,(char*) net->buff,length+head_length+1+offset));
  if (thd)
    thd->fatal_error=0;			// Error message is given
  DBUG_VOID_RETURN;
}


void
send_ok(NET *net,ha_rows affected_rows,ulonglong id,const char *message)
{
  if (net->no_send_ok)				// hack for re-parsing queries
    return;

  char buff[MYSQL_ERRMSG_SIZE+10],*pos;
  DBUG_ENTER("send_ok");
  buff[0]=0;					// No fields
  pos=net_store_length(buff+1,(ulonglong) affected_rows);
  pos=net_store_length(pos, (ulonglong) id);
  if (net->return_status)
  {
    int2store(pos,*net->return_status);
    pos+=2;
  }
  if (message)
    pos=net_store_data((char*) pos,message);
  if (net->vio != 0)
  {
    VOID(my_net_write(net,buff,(uint) (pos-buff)));
    VOID(net_flush(net));
  }
  DBUG_VOID_RETURN;
}

void
send_eof(NET *net,bool no_flush)
{
  static char eof_buff[1]= { (char) 254 };	/* Marker for end of fields */
  DBUG_ENTER("send_eof");
  if (net->vio != 0)
  {
    VOID(my_net_write(net,eof_buff,1));
    if (!no_flush)
      VOID(net_flush(net));
  }
  DBUG_VOID_RETURN;
}


/****************************************************************************
** Store a field length in logical packet
****************************************************************************/

char *
net_store_length(char *pkg, ulonglong length)
{
  uchar *packet=(uchar*) pkg;
  if (length < LL(251))
  {
    *packet=(uchar) length;
    return (char*) packet+1;
  }
  /* 251 is reserved for NULL */
  if (length < LL(65536))
  {
    *packet++=252;
    int2store(packet,(uint) length);
    return (char*) packet+2;
  }
  if (length < LL(16777216))
  {
    *packet++=253;
    int3store(packet,(ulong) length);
    return (char*) packet+3;
  }
  *packet++=254;
  int8store(packet,length);
  return (char*) packet+8;
}

char *
net_store_length(char *pkg, uint length)
{
  uchar *packet=(uchar*) pkg;
  if (length < 251)
  {
    *packet=(uchar) length;
    return (char*) packet+1;
  }
  *packet++=252;
  int2store(packet,(uint) length);
  return (char*) packet+2;
}

/* The following will only be used for short strings < 65K */
char *
net_store_data(char *to,const char *from)
{
  uint length=(uint) strlen(from);
  to=net_store_length(to,length);
  memcpy(to,from,length);
  return to+length;
}


char *
net_store_data(char *to,int32 from)
{
  char buff[20];
  uint length=(uint) (int10_to_str(from,buff,10)-buff);
  to=net_store_length(to,length);
  memcpy(to,buff,length);
  return to+length;
}

char *
net_store_data(char *to,longlong from)
{
  char buff[22];
  uint length=(uint) (longlong10_to_str(from,buff,10)-buff);
  to=net_store_length(to,length);
  memcpy(to,buff,length);
  return to+length;
}


bool net_store_null(String *packet)
{
  return packet->append((char) 251);
}

bool
net_store_data(String *packet,const char *from,uint length)
{
  ulong packet_length=packet->length();
  if (packet_length+9+length > packet->alloced_length() &&
      packet->realloc(packet_length+9+length))
    return 1;
  char *to=(char*) net_store_length((char*) packet->ptr()+packet_length,
				    (ulonglong) length);
  memcpy(to,from,length);
  packet->length((uint) (to+length-packet->ptr()));
  return 0;
}

/* The following is only used at short, null terminated data */

bool
net_store_data(String *packet,const char *from)
{
  uint length=(uint) strlen(from);
  uint packet_length=packet->length();
  /*
    3 is the longest coding for storing a string with the used
    net_store_length() function. We use 5 here 'just in case'
  */
  if (packet_length+5+length > packet->alloced_length() &&
      packet->realloc(packet_length+5+length))
    return 1;
  char *to=(char*) net_store_length((char*) packet->ptr()+packet_length,
				    length);
  memcpy(to,from,length);
  packet->length((uint) (to+length-packet->ptr()));
  return 0;
}


bool
net_store_data(String *packet,uint32 from)
{
  char buff[20];
  return net_store_data(packet,(char*) buff,
			(uint) (int10_to_str(from,buff,10)-buff));
}

bool
net_store_data(String *packet, longlong from)
{
  char buff[22];
  return net_store_data(packet,(char*) buff,
			(uint) (longlong10_to_str(from,buff,10)-buff));
}

bool
net_store_data(String *packet,struct tm *tmp)
{
  char buff[20];
  sprintf(buff,"%04d-%02d-%02d %02d:%02d:%02d",
	  ((int) (tmp->tm_year+1900)) % 10000,
	  (int) tmp->tm_mon+1,
	  (int) tmp->tm_mday,
	  (int) tmp->tm_hour,
	  (int) tmp->tm_min,
	  (int) tmp->tm_sec);
  return net_store_data(packet,(char*) buff,19);
}

bool net_store_data(String* packet, I_List<i_string>* str_list)
{
  char buf[256];
  String tmp(buf, sizeof(buf));
  tmp.length(0);
  I_List_iterator<i_string> it(*str_list);
  i_string* s;

  while ((s=it++))
  {
    if (tmp.length())
      tmp.append(',');
    tmp.append(s->ptr);
  }

  return net_store_data(packet, (char*)tmp.ptr(), tmp.length());
}

/*
** translate and store data; These are mainly used by the SHOW functions
*/

bool
net_store_data(String *packet,CONVERT *convert, const char *from,uint length)
{
  if (convert)
    return convert->store(packet, from, length);
  return net_store_data(packet,from,length);
}

bool
net_store_data(String *packet, CONVERT *convert, const char *from)
{
  uint length=(uint) strlen(from);
  if (convert)
    return convert->store(packet, from, length);
  return net_store_data(packet,from,length);
}

/*
  Function called by my_net_init() to set some check variables
*/

extern "C" {
void my_net_local_init(NET *net)
{
  net->max_packet=   (uint) global_system_variables.net_buffer_length;
  net->read_timeout= (uint) global_system_variables.net_read_timeout;
  net->write_timeout=(uint) global_system_variables.net_write_timeout;
  net->retry_count=  (uint) global_system_variables.net_retry_count;
  net->max_packet_size= max(global_system_variables.net_buffer_length,
			    global_system_variables.max_allowed_packet);
}
}
