Function decimal2bin

strings/decimal.c:1265–1381

Convert decimal to its binary fixed-length representation two representations of the same length can be compared with memcmp with the correct -1/0/+1 result SYNOPSIS decimal2bin() from - value to convert to - points to buffer where string representation should be stored precision/scale - see decimal_bin_size() below NOTE the buffer is assumed to be of th

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*/
int decimal2bin(decimal_t *from, uchar *to, int precision, int frac)
{
  dec1 mask=from->sign ? -1 : 0, *buf1=from->buf, *stop1;
  int error=E_DEC_OK, intg=precision-frac,
      isize1, intg1, intg1x, from_intg,
      intg0=intg/DIG_PER_DEC1,
      frac0=frac/DIG_PER_DEC1,
      intg0x=intg-intg0*DIG_PER_DEC1,
      frac0x=frac-frac0*DIG_PER_DEC1,
      frac1=from->frac/DIG_PER_DEC1,
      frac1x=from->frac-frac1*DIG_PER_DEC1,
      isize0=intg0*sizeof(dec1)+dig2bytes[intg0x],
      fsize0=frac0*sizeof(dec1)+dig2bytes[frac0x],
      fsize1=frac1*sizeof(dec1)+dig2bytes[frac1x];
  const int orig_isize0= isize0;
  const int orig_fsize0= fsize0;
  uchar *orig_to= to;

  buf1= remove_leading_zeroes(from, &from_intg);

  if (unlikely(from_intg+fsize1==0))
  {
    mask=0; /* just in case */
    intg=1;
    buf1=&mask;
  }

  intg1=from_intg/DIG_PER_DEC1;
  intg1x=from_intg-intg1*DIG_PER_DEC1;
  isize1=intg1*sizeof(dec1)+dig2bytes[intg1x];

  if (intg < from_intg)
  {
    buf1+=intg1-intg0+(intg1x>0)-(intg0x>0);
    intg1=intg0; intg1x=intg0x;
    error=E_DEC_OVERFLOW;
  }
  else if (isize0 > isize1)
  {
    while (isize0-- > isize1)
      *to++= (char)mask;
  }
  if (fsize0 < fsize1)
  {
    frac1=frac0; frac1x=frac0x;
    error=E_DEC_TRUNCATED;
  }
  else if (fsize0 > fsize1 && frac1x)
  {
    if (frac0 == frac1)
    {
      frac1x=frac0x;
      fsize0= fsize1;
    }
    else
    {
      frac1++;
      frac1x=0;