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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd


%%	header

/**	@file
	Double to char text conversion using the more secure functions
	_snprintf_s(), _snprintf() or snprintf() instead of sprintf()
	if available.

	CRT on Windows: Required.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#define STDLIB_H_INCLUDED 1
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**	Convert double value to string.
	@param	dptr	Destination buffer pointer.
	@param	szdptr	Size of destination buffer.
	@param	v	Value to convert.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if dptr is NULL or szdptr is less than 2,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if the destination buffer is too small to store the string.
*/
int
dk4double_to_string_c8(char *dptr, size_t szdptr, double v, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4dblc8.h"
#include "dk4str8.h"


int
dk4double_to_string_c8(char *dptr, size_t szdptr, double v, dk4_er_t *erp)
{
#if DK4_HAVE__SNPRINTF_S
  /* +++ _snprintf_s */
  char		 buf[64];
  int		 back	= 0;
  int		 res	= 0;
  if (NULL != dptr) { *dptr = '\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    res = _snprintf_s(buf, sizeof(buf), (sizeof(buf)-1), "%lg", v);
    if ((0 < res) && ((size_t)res < sizeof(buf))) {
      buf[res] = '\0';
      back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
  /* --- _snprintf_s */
#else
#if DK4_HAVE__SNPRINTF
  /* +++ _snprintf */
  char		 buf[64];
  int		 back	= 0;
  int		 res	= 0;
  if (NULL != dptr) { *dptr = '\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    res = _snprintf(buf, sizeof(buf), "%lg", v);
    if ((0 < res) && ((size_t)res < sizeof(buf))) {
      buf[res] = '\0';
      back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
  /* --- _snprintf */
#else
#if DK4_HAVE_SNPRINTF
  /* +++ snprintf */
  char		 buf[64];
  int		 back	= 0;
  int		 res	= 0;
  if (NULL != dptr) { *dptr = '\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    res = snprintf(buf, sizeof(buf), "%lg", v);
    if ((0 < res) && ((size_t)res < sizeof(buf))) {
      buf[res] = '\0';
      back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
  /* --- snprintf */
#else
  /* +++ sprintf */
  char		 buf[64];
  int		 back	= 0;
  int		 res	= 0;
  if (NULL != dptr) { *dptr = '\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    sprintf(buf, "%lg", v);
    back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
  /* --- sprintf */
#endif
#endif
#endif
}