~drizzle-trunk/drizzle/development

/* Copyright (C) 2005-2006 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; version 2 of the License.

   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 <drizzled/server_includes.h>

#include <time.h>

#include <drizzled/error.h>

/**

  report result of decimal operation.

  @param result  decimal library return code (E_DEC_* see include/decimal.h)

  @todo

    Fix error messages

  @return

    result

*/

int decimal_operation_results(int result)

{

  switch (result) {

  case E_DEC_OK:

    break;

  case E_DEC_TRUNCATED:

    push_warning_printf(current_session, DRIZZLE_ERROR::WARN_LEVEL_WARN,

			ER_WARN_DATA_TRUNCATED, ER(ER_WARN_DATA_TRUNCATED),

			"", (long)-1);

    break;

  case E_DEC_OVERFLOW:

    push_warning_printf(current_session, DRIZZLE_ERROR::WARN_LEVEL_ERROR,

                        ER_TRUNCATED_WRONG_VALUE,

                        ER(ER_TRUNCATED_WRONG_VALUE),

			"DECIMAL", "");

    break;

  case E_DEC_DIV_ZERO:

    push_warning_printf(current_session, DRIZZLE_ERROR::WARN_LEVEL_ERROR,

			ER_DIVISION_BY_ZERO, ER(ER_DIVISION_BY_ZERO));

    break;

  case E_DEC_BAD_NUM:

    push_warning_printf(current_session, DRIZZLE_ERROR::WARN_LEVEL_ERROR,

			ER_TRUNCATED_WRONG_VALUE_FOR_FIELD,

			ER(ER_TRUNCATED_WRONG_VALUE_FOR_FIELD),

			"decimal", "", "", (long)-1);

    break;

  case E_DEC_OOM:

    my_error(ER_OUT_OF_RESOURCES, MYF(0));

    break;

  default:

    assert(0);

  }

  return result;

}

/**

  @brief Converting decimal to string

  @details Convert given my_decimal to String; allocate buffer as needed.

  @param[in]   mask        what problems to warn on (mask of E_DEC_* values)

  @param[in]   d           the decimal to print

  @param[in]   fixed_prec  overall number of digits if ZEROFILL, 0 otherwise

  @param[in]   fixed_dec   number of decimal places (if fixed_prec != 0)

  @param[in]   filler      what char to pad with (ZEROFILL et al.)

  @param[out]  *str        where to store the resulting string

  @return error coce

    @retval E_DEC_OK

    @retval E_DEC_TRUNCATED

    @retval E_DEC_OVERFLOW

    @retval E_DEC_OOM

*/

int my_decimal2string(uint32_t mask, const my_decimal *d,

                      uint32_t fixed_prec, uint32_t fixed_dec,

                      char filler, String *str)

{

  /*

    Calculate the size of the string: For DECIMAL(a,b), fixed_prec==a

    holds true iff the type is also ZEROFILL, which in turn implies

    UNSIGNED. Hence the buffer for a ZEROFILLed value is the length

    the user requested, plus one for a possible decimal point, plus

    one if the user only wanted decimal places, but we force a leading

    zero on them. Because the type is implicitly UNSIGNED, we do not

    need to reserve a character for the sign. For all other cases,

    fixed_prec will be 0, and my_decimal_string_length() will be called

    instead to calculate the required size of the buffer.

  */

  int length= (fixed_prec

               ? (fixed_prec + ((fixed_prec == fixed_dec) ? 1 : 0) + 1)

               : my_decimal_string_length(d));

  int result;

  if (str->alloc(length))

    return check_result(mask, E_DEC_OOM);

  result= decimal2string((decimal_t*) d, (char*) str->ptr(),

                         &length, (int)fixed_prec, fixed_dec,

                         filler);

  str->length(length);

  return check_result(mask, result);

}

/*

  Convert from decimal to binary representation

  SYNOPSIS

    my_decimal2binary()

    mask        error processing mask

    d           number for conversion

    bin         pointer to buffer where to write result

    prec        overall number of decimal digits

    scale       number of decimal digits after decimal point

  NOTE

    Before conversion we round number if it need but produce truncation

    error in this case

  RETURN

    E_DEC_OK

    E_DEC_TRUNCATED

    E_DEC_OVERFLOW

*/

int my_decimal2binary(uint32_t mask, const my_decimal *d, unsigned char *bin, int prec,

		      int scale)

{

  int err1= E_DEC_OK, err2;

  my_decimal rounded;

  my_decimal2decimal(d, &rounded);

  rounded.frac= decimal_actual_fraction(&rounded);

  if (scale < rounded.frac)

  {

    err1= E_DEC_TRUNCATED;

    /* decimal_round can return only E_DEC_TRUNCATED */

    decimal_round(&rounded, &rounded, scale, HALF_UP);

  }

  err2= decimal2bin(&rounded, bin, prec, scale);

  if (!err2)

    err2= err1;

  return check_result(mask, err2);

}

/*

  Convert string for decimal when string can be in some multibyte charset

  SYNOPSIS

    str2my_decimal()

    mask            error processing mask

    from            string to process

    length          length of given string

    charset         charset of given string

    decimal_value   buffer for result storing

  RESULT

    E_DEC_OK

    E_DEC_TRUNCATED

    E_DEC_OVERFLOW

    E_DEC_BAD_NUM

    E_DEC_OOM

*/

int str2my_decimal(uint32_t mask, const char *from, uint32_t length,

                   const CHARSET_INFO * charset, my_decimal *decimal_value)

{

  char *end, *from_end;

  int err;

  char buff[STRING_BUFFER_USUAL_SIZE];

  String tmp(buff, sizeof(buff), &my_charset_bin);

  if (charset->mbminlen > 1)

  {

    uint32_t dummy_errors;

    tmp.copy(from, length, charset, &my_charset_utf8_general_ci, &dummy_errors);

    from= tmp.ptr();

    length=  tmp.length();

    charset= &my_charset_bin;

  }

  from_end= end= (char*) from+length;

  err= string2decimal((char *)from, (decimal_t*) decimal_value, &end);

  if (end != from_end && !err)

  {

    /* Give warning if there is something other than end space */

    for ( ; end < from_end; end++)

    {

      if (!my_isspace(&my_charset_utf8_general_ci, *end))

      {

        err= E_DEC_TRUNCATED;

        break;

      }

    }

  }

  check_result_and_overflow(mask, err, decimal_value);

  return err;

}

my_decimal *date2my_decimal(DRIZZLE_TIME *ltime, my_decimal *dec)

{

  int64_t date;

  date = (ltime->year*100L + ltime->month)*100L + ltime->day;

  if (ltime->time_type > DRIZZLE_TIMESTAMP_DATE)

    date= ((date*100L + ltime->hour)*100L+ ltime->minute)*100L + ltime->second;

  if (int2my_decimal(E_DEC_FATAL_ERROR, date, false, dec))

    return dec;

  if (ltime->second_part)

  {

    dec->buf[(dec->intg-1) / 9 + 1]= ltime->second_part * 1000;

    dec->frac= 6;

  }

  return dec;

}

void my_decimal_trim(uint32_t *precision, uint32_t *scale)

{

  if (!(*precision) && !(*scale))

  {

    *precision= 10;

    *scale= 0;

    return;

  }

}