writer_float_fixed.hpp

#pragma once
 
template <typename Float>
bool Writer::FormatFixedText(Float value, uint8_t precision, bool alternate, char* out,
                             size_t& out_size)
{
  Float rounded = RoundDecimal(value, precision);
  if (!std::isfinite(rounded))
  {
    return false;
  }
  auto normalized = NormalizeDecimal(rounded);
  int integer_exponent = (rounded == 0) ? 0 : normalized.exponent;
  int start_pos = (integer_exponent > 0) ? integer_exponent : 0;
  Float scale = Power10<Float>(start_pos);
 
  out_size = 0;
  for (int pos = start_pos; pos >= 0; --pos)
  {
    if (!AppendBufferChar(out, float_buffer_capacity, out_size,
                          static_cast<char>('0' + ExtractDigit(rounded, scale))))
    {
      return false;
    }
    scale /= 10;
  }
 
  if (precision != 0 || alternate)
  {
    if (!AppendBufferChar(out, float_buffer_capacity, out_size, '.'))
    {
      return false;
    }
  }
 
  for (uint8_t i = 0; i < precision; ++i)
  {
    if (!AppendBufferChar(out, float_buffer_capacity, out_size,
                          static_cast<char>('0' + ExtractDigit(rounded, scale))))
    {
      return false;
    }
    scale /= 10;
  }
 
  return true;
}