~drizzle-trunk/drizzle/development

/* - mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 MySQL

 *

 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include <drizzled/server_includes.h>

#include <drizzled/field/double.h>

#include <drizzled/error.h>

#include <drizzled/table.h>

#include <drizzled/session.h>

#include <drizzled/protocol.h>

#include CMATH_H

#if defined(CMATH_NAMESPACE)

using namespace CMATH_NAMESPACE;

#endif

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

  double precision floating point numbers

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

int Field_double::store(const char *from,uint32_t len, const CHARSET_INFO * const cs)

{

  int error;

  char *end;

  double nr= my_strntod(cs,(char*) from, len, &end, &error);

  if (error || (!len || (((uint32_t) (end-from) != len) && table->in_use->count_cuted_fields)))

  {

    set_warning(DRIZZLE_ERROR::WARN_LEVEL_WARN,

                (error ? ER_WARN_DATA_OUT_OF_RANGE : ER_WARN_DATA_TRUNCATED), 1);

    error= error ? 1 : 2;

  }

  Field_double::store(nr);

  return error;

}

int Field_double::store(double nr)

{

  int error= truncate(&nr, DBL_MAX);

#ifdef WORDS_BIGENDIAN

  if (table->s->db_low_byte_first)

  {

    float8store(ptr,nr);

  }

  else

#endif

    doublestore(ptr,nr);

  return error;

}

int Field_double::store(int64_t nr, bool unsigned_val)

{

  return Field_double::store(unsigned_val ? uint64_t2double((uint64_t) nr) :

                             (double) nr);

}

double Field_double::val_real(void)

{

  double j;

#ifdef WORDS_BIGENDIAN

  if (table->s->db_low_byte_first)

  {

    float8get(j,ptr);

  }

  else

#endif

    doubleget(j,ptr);

  return j;

}

int64_t Field_double::val_int(void)

{

  double j;

  int64_t res;

#ifdef WORDS_BIGENDIAN

  if (table->s->db_low_byte_first)

  {

    float8get(j,ptr);

  }

  else

#endif

    doubleget(j,ptr);

  /* Check whether we fit into int64_t range */

  if (j <= (double) INT64_MIN)

  {

    res= (int64_t) INT64_MIN;

    goto warn;

  }

  if (j >= (double) (uint64_t) INT64_MAX)

  {

    res= (int64_t) INT64_MAX;

    goto warn;

  }

  return (int64_t) rint(j);

warn:

  {

    char buf[DOUBLE_TO_STRING_CONVERSION_BUFFER_SIZE];

    String tmp(buf, sizeof(buf), &my_charset_utf8_general_ci), *str;

    str= val_str(&tmp, &tmp);

    push_warning_printf(current_session, DRIZZLE_ERROR::WARN_LEVEL_WARN,

                        ER_TRUNCATED_WRONG_VALUE,

                        ER(ER_TRUNCATED_WRONG_VALUE), "INTEGER",

                        str->c_ptr());

  }

  return res;

}

String *Field_double::val_str(String *val_buffer,

			      String *)

{

  double nr;

#ifdef WORDS_BIGENDIAN

  if (table->s->db_low_byte_first)

  {

    float8get(nr,ptr);

  }

  else

#endif

    doubleget(nr,ptr);

  uint32_t to_length=cmax(field_length, (uint32_t)DOUBLE_TO_STRING_CONVERSION_BUFFER_SIZE);

  val_buffer->alloc(to_length);

  char *to=(char*) val_buffer->ptr();

  size_t len;

  if (dec >= NOT_FIXED_DEC)

    len= my_gcvt(nr, MY_GCVT_ARG_DOUBLE, to_length - 1, to, NULL);

  else

    len= my_fcvt(nr, dec, to, NULL);

  val_buffer->length((uint32_t) len);

  return val_buffer;

}

int Field_double::cmp(const unsigned char *a_ptr, const unsigned char *b_ptr)

{

  double a,b;

#ifdef WORDS_BIGENDIAN

  if (table->s->db_low_byte_first)

  {

    float8get(a,a_ptr);

    float8get(b,b_ptr);

  }

  else

#endif

  {

    doubleget(a, a_ptr);

    doubleget(b, b_ptr);

  }

  return (a < b) ? -1 : (a > b) ? 1 : 0;

}

/* The following should work for IEEE */

void Field_double::sort_string(unsigned char *to,uint32_t )

{

  double nr;

#ifdef WORDS_BIGENDIAN

  if (table->s->db_low_byte_first)

  {

    float8get(nr,ptr);

  }

  else

#endif

    doubleget(nr,ptr);

  change_double_for_sort(nr, to);

}

/**

   Save the field metadata for double fields.

   Saves the pack length in the first byte of the field metadata array

   at index of *metadata_ptr.

   @param   metadata_ptr   First byte of field metadata

   @returns number of bytes written to metadata_ptr

*/

int Field_double::do_save_field_metadata(unsigned char *metadata_ptr)

{

  *metadata_ptr= pack_length();

  return 1;

}

void Field_double::sql_type(String &res) const

{

  const CHARSET_INFO * const cs=res.charset();

  if (dec == NOT_FIXED_DEC)

  {

    res.set_ascii(STRING_WITH_LEN("double"));

  }

  else

  {

    res.length(cs->cset->snprintf(cs,(char*) res.ptr(),res.alloced_length(),

			    "double(%d,%d)",(int) field_length,dec));

  }

}