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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	exact	Flag: Write enough digits to allow exact restoration.
	@param	minimize	Minimize exact respresentation.
	@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
dk4ma_write_wc_double(
  wchar_t *dptr, size_t szdptr, double v, int exact, int minimize, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif


%%	module

#include "dk4conf.h"
#include "dk4types.h"

#if DK4_HAVE_LOCALE_H
#ifndef LOCALE_H_INCLUDED
#include <locale.h>
#define	LOCALE_H_INCLUDED 1
#endif
#endif

#include "dk4mem.h"
#include "dk4mao8dbl.h"
#include "dk4maowdbl.h"
#include "dk4str8.h"
#include "dk4strw.h"



/**	Locale to user for conversion.
*/
static const char	locale_kw[] = { "C" };



/**	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	exact	Flag: Write enough digits to allow exact restoration.
	@param	minimize	Minimize exact respresentation.
	@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.
*/
static
void
dk4double_squeeze_wc_string(wchar_t *buf)
{
  wchar_t	*ptre	= NULL;
  wchar_t	*ptrdot	= NULL;
  wchar_t	*ptrcom	= NULL;
  wchar_t	*ptrcut	= NULL;
  wchar_t	*ptr;
  int		 useexp	= 1;
  $? "+ dk4double_squeeze_wc_string \"%!ws\"", TR_LSTR(buf)
  if (NULL != buf) {
    ptr = buf;
    while(L'\0' != *ptr) {
      if ((L'e' == *ptr) || (L'E' == *ptr)) {
        if (NULL == ptre) { ptre = ptr; }
      } else {
        if (L'.' == *ptr) {
	  if (NULL == ptrdot) { ptrdot = ptr; }
	} else {
	  if (L',' == *ptr) {
	    if (NULL == ptrcom) { ptrcom = ptr; }
	  }
	}
      }
      ptr++;
    }
    if (NULL != ptre) {				$? ". check exponent"
      *ptre = '\0';
      ptr = ptre;
      ptr++;
      if ((L'+' == *ptr) || (L'0' == *ptr)) {	$? ". leading + or 0"
        useexp = 0;
	ptr++;
	while(L'\0' != *ptr) {
	  if (L'0' != *ptr) {			$? ". non-0 char \"%c\"", *ptr
	    useexp = 1;
	  }
	  ptr++;
	}
      }
    }
    if (NULL != ptrdot) {
      ptrdot++;
      if (L'\0' != *ptrdot) {			$? ". chars after dot"
        ptrdot++;
        while(L'\0' != *ptrdot) {		$? ". check \"%c\"", *ptrdot
          if (L'0' == *ptrdot) {
	    if (NULL == ptrcut) {
	      ptrcut = ptrdot;			$? ". cut"
	    }
	  } else {
	    ptrcut = NULL;			$? ". no cut"
	  }
          ptrdot++;
        }
      }
    } else {
      if (NULL != ptrcom) {
        ptrcom++;
	if (L'\0' != *ptrcom) {
	  ptrcom++;
	  while (L'\0' != *ptrcom) {
	    if (L'0' == *ptrcom) {
	      if (NULL == ptrcut) {
	        ptrcut = ptrcom;
	      }
	    } else {
	      ptrcut = NULL;
	    }
	    ptrcom++;
	  }
	}
      }
    }
    if ((NULL != ptre) && (0 != useexp)) {
      *ptre = L'e';
    }
    if (NULL != ptrcut) {
      if ((NULL != ptre) && (0 != useexp)) {
        while (L'\0' != *ptre) {
	  *(ptrcut++) = *(ptre++);
	}
      }
      *ptrcut = L'\0';
    }
  }
  $? "- dk4double_squeeze_wc_string \"%!ws\"", TR_LSTR(buf)
}



static
int
dk4ma_internal_write_wc_double(
  wchar_t *dptr, size_t szdptr, double v, int exact, int minimize, 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)) {
    if (0 != exact) {
      res = _snwprintf_s(
        buf, DK4_SIZEOF(buf,dkChar), _TRUNCATE, L"%.*e", (int)DK4_DBL_DIGITS, v
      );
      if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
        buf[res] = L'\0';
	if (0 != minimize) {
	  dk4double_squeeze_wc_string(buf);
	}
        back = dk4strw_cpy_s(dptr, szdptr, buf, erp);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {
      res = _snwprintf_s(
        buf, DK4_SIZEOF(buf,dkChar), _TRUNCATE, L"%g", 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)) {
    if (0 != exact) {
      0 = _snwprintf(
        buf, DK4_SIZEOF(buf,dkChar), L"%.*e", (int)DK4_DBL_DIGITS, v
      );
      if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
        buf[res] = L'\0';
	if (0 != minimize) {
	  dk4double_squeeze_wc_string(buf);
	}
        back = dk4strw_cpy_s(dptr, szdptr, buf, erp);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {
      0 = _snwprintf(
        buf, DK4_SIZEOF(buf,dkChar), L"%g", 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)) {
    if (0 != exact) {
      res = snwprintf(buf,DK4_SIZEOF(buf,dkChar),L"%.*e",(int)DK4_DBL_DIGITS,v);
      if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
        buf[res] = L'\0';
	if (0 != minimize) {
	  dk4double_squeeze_wc_string(buf);
	}
        back = dk4strw_cpy_s(dptr, szdptr, buf, erp);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {
      res = snwprintf(buf, DK4_SIZEOF(buf,dkChar), L"%g", 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)) {
    if (0 != exact) {
      res = swprintf(buf,DK4_SIZEOF(buf,dkChar),L"%.*e",(int)DK4_DBL_DIGITS,v);
      if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) {
        buf[res] = L'\0';
	if (0 != minimize) {
	  dk4double_squeeze_wc_string(buf);
	}
        back = dk4strw_cpy_s(dptr, szdptr, buf, erp);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {
      res = swprintf(buf, DK4_SIZEOF(buf,dkChar), L"%g", 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 != dk4ma_write_c8_double(buf,sizeof(buf),v,exact,minimize,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
}



int
dk4ma_write_wc_double(
  wchar_t *dptr, size_t szdptr, double v, int exact, int minimize, dk4_er_t *erp
)
{

#if	(DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC)
  char		*oldloc	= NULL;
#endif
  int		 back	= 0;

#if	(DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC)
  oldloc = setlocale(LC_NUMERIC, NULL);
  (void)setlocale(LC_NUMERIC, locale_kw);
#endif
  back = dk4ma_internal_write_wc_double(dptr, szdptr, v, exact, minimize, erp);
#if	(DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC)
  (void)setlocale(LC_NUMERIC, oldloc);
#endif
  return back;
}