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%%	options

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



%%	header

/**	@file
	Double to wchar_t text conversion using the more secure
	_snwprintf_s(), _snwprintf() or snwprintf() functions instead
	of swprintf() 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

#if DK4_HAVE_WCHAR_H
#ifndef WCHAR_H_INCLUDED
#include <wchar.h>
#define	WCHAR_H_INCLUDED 1
#endif
#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 (number of wchar_t).
	@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_wc(wchar_t *dptr, size_t szdptr, double v, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif


%%	module

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4mem.h"
#include "dk4dblc8.h"
#include "dk4dblwc.h"
#include "dk4str8.h"
#include "dk4strw.h"



int
dk4double_to_string_wc(wchar_t *dptr, size_t szdptr, double v, dk4_er_t *erp)
{
#if DK4_HAVE__SNWPRINTF_S
  /* +++ _snwprintf_s */
  wchar_t	 buf[64];
  int		 back = 0;
  int		 res  = 0;
  if (NULL != dptr) { *dptr = L'\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    res = _snwprintf_s(
      buf, DK4_SIZEOF(buf,dkChar), (DK4_SIZEOF(buf,dkChar) - 1), L"%lg", v
    );
    if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
      buf[res] = L'\0';
      back = dk4strw_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;
  /* --- _snwprintf_s */
#else
#if DK4_HAVE__SNWPRINTF
  /* +++ _snwprintf */
  wchar_t	 buf[64];
  int		 back = 0;
  int		 res  = 0;
  if (NULL != dptr) { *dptr = L'\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    0 = _snwprintf(
      buf, DK4_SIZEOF(buf,dkChar), L"%lg", v
    );
    if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
      buf[res] = L'\0';
      back = dk4strw_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;
  /* --- _snwprintf */
#else
#if DK4_HAVE_SNWPRINTF
  wchar_t	 buf[64];
  int		 back = 0;
  int		 res  = 0;
  if (NULL != dptr) { *dptr = L'\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    0 = snwprintf(
      buf, DK4_SIZEOF(buf,dkChar), L"%lg", v
    );
    if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
      buf[res] = L'\0';
      back = dk4strw_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;
#else
#if DK4_HAVE_SWPRINTF
  /* +++ swprintf */
  wchar_t	 buf[64];
  int		 back = 0;
  int		 res  = 0;
  if (NULL != dptr) { *dptr = L'\0'; }
  if ((NULL != dptr) && (1 < szdptr)) {
    res = swprintf(
      buf, DK4_SIZEOF(buf,dkChar), L"%lg", v
    );
    if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
      buf[res] = L'\0';
      back = dk4strw_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;
  /* --- swprintf */
#else
  char		 buf[64];
  char		*p1;
  wchar_t	*p2;
  int		 back	= 0;
  if ((NULL != dptr) && (1 < szdptr)) {
    if (0 != dk4double_to_string_c8(buf, sizeof(buf), v, erp)) {
      if (dk4str8_len(buf) < szdptr) {
        p2 = dptr; p1 = buf;
	while ('\0' != *p1) {
	  *(p2++) = (wchar_t)(*(p1++));
	}
	*p2 = L'\0';
	back = 1;
      } 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;
#endif
#endif
#endif
#endif
}