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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	exact		Flag: Create exact representation.
	@param	minimize	Minimize exact representation.
	@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_c8_double(
  char *dptr, size_t szdptr, double v, int exact, int minimize, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4mao8dbl.h"
#include "dk4str8.h"


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



$!trace-include



/**	Format strings used for printf family.
*/
static const char * const dk4double_format_strings[] = {
/*  0 */	"%.*e",
/*  1 */	"%g",
/*  2 */	"C"
};



/**	Squeeze a double written to string.
	@param	buf	Buffer containing the string.
*/
static
void
dk4double_squeeze_c8_string(char *buf)
{
  char		*ptre	= NULL;
  char		*ptrdot	= NULL;
  char		*ptrcom	= NULL;
  char		*ptrcut	= NULL;
  char		*ptr;
  int		 useexp	= 1;
  $? "+ dk4double_squeeze_c8_string \"%s\"", TR_8STR(buf)
  if (NULL != buf) {
    ptr = buf;
    while('\0' != *ptr) {
      switch (*ptr) {
        case 'e': case 'E': {			$? ". exponent found"
	  if (NULL == ptre) { ptre = ptr; }
	} break;
	case '.': {				$? ". dot found"
	  if (NULL == ptrdot) { ptrdot = ptr; }
	} break;
	case ',': {
	  if (NULL == ptrcom) { ptrcom = ptr; }
	} break;
      }
      ptr++;
    }
    if (NULL != ptre) {				$? ". check exponent"
      *ptre = '\0';
      ptr = ptre;
      ptr++;					$? ". c=\"%c\"", *ptr
      if (('+' == *ptr) || ('0' == *ptr)) {	$? ". leading + or 0"
        useexp = 0;				$? ". useexp = 0"
	ptr++;
	while('\0' != *ptr) {			$? ". c=\"%c\"", *ptr
	  if ('0' != *ptr) {			$? ". non-0 char \"%c\"", *ptr
	    useexp = 1;				$? ". useexp = 1"
	  }
	  ptr++;
	}
      }
    }
    if (NULL != ptrdot) {
      ptrdot++;
      if ('\0' != *ptrdot) {			$? ". chars after dot"
        ptrdot++;
        while('\0' != *ptrdot) {		$? ". check \"%c\"", *ptrdot
          if ('0' == *ptrdot) {
	    if (NULL == ptrcut) {
	      ptrcut = ptrdot;			$? ". cut"
	    }
	  } else {
	    ptrcut = NULL;			$? ". no cut"
	  }
          ptrdot++;
        }
      }
    } else {
      if (NULL != ptrcom) {
        ptrcom++;
	if ('\0' != *ptrcom) {
	  ptrcom++;
	  while ('\0' != *ptrcom) {
	    if ('0' == *ptrcom) {
	      if (NULL == ptrcut) {
	        ptrcut = ptrcom;
	      }
	    } else {
	      ptrcut = NULL;
	    }
	    ptrcom++;
	  }
	}
      }
    }
    if ((NULL != ptre) && (0 != useexp)) {
      *ptre = 'e';
    }
    if (NULL != ptrcut) {
      if ((NULL != ptre) && (0 != useexp)) {
        while ('\0' != *ptre) {
	  *(ptrcut++) = *(ptre++);
	}
      }
      *ptrcut = '\0';
    }
  }
  $? "- dk4double_squeeze_c8_string \"%s\"", TR_8STR(buf)
}



static
int
dk4ma_internal_write_c8_double(
  char *dptr, size_t szdptr, double v, int exact, int minimize, 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)) {
    if (0 != exact) {
      res = _snprintf_s(
        buf, sizeof(buf), _TRUNCATE, dk4double_format_strings[0],
	(int)DK4_DBL_DIGITS, v
      );
      if ((0 < res) && ((size_t)res < sizeof(buf))) {
        buf[res] = '\0';
	if (0 != minimize) {
	  dk4double_squeeze_c8_string(buf);
	}
	back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {
      res = _snprintf_s(
        buf, sizeof(buf), _TRUNCATE, dk4double_format_strings[1], 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)) {
    if (0 != exact) {
      res = _snprintf(
        buf, sizeof(buf), dk4double_format_strings[0], (int)DK4_DBL_DIGITS, v
      );
      if ((0 < res) && ((size_t)res < sizeof(buf))) {
        buf[res] = '\0';
	if (0 != minimize) {
	  dk4double_squeeze_c8_string(buf);
	}
        back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {
      res = _snprintf(buf, sizeof(buf), dk4double_format_strings[1], 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)) {
    if (0 != exact) {
      res = snprintf(
        buf, sizeof(buf), dk4double_format_strings[0], (int)DK4_DBL_DIGITS, v
      );
      if ((0 < res) && ((size_t)res < sizeof(buf))) {
        buf[res] = '\0';
	if (0 != minimize) {
	  dk4double_squeeze_c8_string(buf);
	}
        back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {
      res = snprintf(buf, sizeof(buf), dk4double_format_strings[1], 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)) {
    if (0 != exact) {
      sprintf(buf, dk4double_format_strings[0], (int)DK4_DBL_DIGITS, v);
      if (0 != minimize) {
	dk4double_squeeze_c8_string(buf);
      }
      back = dk4str8_cpy_s(dptr, szdptr, buf, erp);
    } else {
      sprintf(buf, dk4double_format_strings[1], 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
}



int
dk4ma_write_c8_double(
  char *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, dk4double_format_strings[2]);
#endif
  back = dk4ma_internal_write_c8_double(dptr, szdptr, v, exact, minimize, erp);
#if	(DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC)
  (void)setlocale(LC_NUMERIC, oldloc);
#endif
  return back;
}