/*
  Copyright 2019-2020 David Robillard <http://drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef SERD_DECIMAL_H
#define SERD_DECIMAL_H

#include <stdint.h>

typedef struct {
	unsigned count; ///< Number of digits
	int      expt;  ///< Power of 10 exponent
} SerdDecimalCount;

/// Return the number of decimal digits required to represent `n`
int
serd_count_digits(uint64_t i);

/**
   Write significant decimal digits for `d` into `buf`.

   Writes only significant digits, without any leading or trailing zeros.  The
   actual number is given by the exponent in the return value.

   @param d The number to convert to decimal, must be finite and non-zero.
   @param buf The output buffer at least `max_digits` long.
   @param max_digits The maximum number of digits to write.
*/
SerdDecimalCount
serd_decimals(double d, char* buf, unsigned max_digits);

#endif // SERD_DECIMAL_H