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%%	options

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



%%	header

/**	@file
	Read double value from char string.
	
	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

#ifdef __cplusplus
extern "C" {
#endif

/**	Read double value from char string.
	The function temporarily resets the LC_NUMERIC locale setting
	to "C" to retrieve the number and returns the setting to the
	original value before returning.
	@param	rp	Address of result variable.
	@param	src	String to process.
	@param	endptr	Address of pointer variable.
			A pointer to the first character not processed
			is stored here. The function may also store
			a NULL pointer here.
			The pointer variable is probably left unchanged
			on errors or if strtod() is not available on your
			system (the sscanf() function is used as fallback).
	@param	atg	Allow trailing garbage:
			0=no unprocessable trailing bytes allowed,
			1=trailing whitespaces allowed,
			2=any trailing characaters allowed.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	DK4_E_INVALID_ARGUMENTS	if rp or src is NULL,
	DK4_E_SYNTAX		if there are unexpected characters in the
				string,
	DK4_E_MATH_OVERFLOW	if a mathematical overflow occurs,
	DK4_E_MATH_UNDERFLOW	if a mathematical underflow occurs.
*/

int
dk4ma_input_c8_double(
  double	 *rp,
  const char	 *src,
  const char	**endptr,
  int		  atg,
  dk4_er_t	 *erp
);

#ifdef __cplusplus
}
#endif


%%	module


#include "dk4mai8dbl.h"

#include "dk4str8.h"

#if DK4_HAVE_ERRNO_H
#ifndef ERRNO_H_INCLUDED
#include <errno.h>
#define	ERRNO_H_INCLUDED 1
#endif
#endif

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

#if DK4_HAVE_STDLIB_H
#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#define	STDLIB_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_MATH_H
#ifndef MATH_H_INCLUDED
#include <math.h>
#define	MATH_H_INCLUDED 1
#endif
#endif



/**	Default locale to use.
*/
static const char	locale_kw[] = { "C" };



/**	Read double value from char string.
	@param	rp	Address of result variable.
	@param	src	String to process.
	@param	endptr	Address of pointer variable.
			A pointer to the first character not processed
			is stored here. The function may also store
			a NULL pointer here.
			The pointer variable is probably left unchanged
			on errors or if strtod() is not available on your
			system (the sscanf() function is used as fallback).
	@param	atg	Allow trailing garbage:
			0=no unprocessable trailing bytes allowed,
			1=trailing whitespaces allowed,
			2=any trailing characaters allowed.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	DK4_E_INVALID_ARGUMENTS	if rp or src is NULL,
	DK4_E_SYNTAX		if there are unexpected characters in the
				string,
	DK4_E_MATH_OVERFLOW	if a mathematical overflow occurs,
	DK4_E_MATH_UNDERFLOW	if a mathematical underflow occurs.
*/

static
int
dk4ma_internal_input_c8_double(
  double	 *rp,
  const char	 *src,
  const char	**endptr,
  int		  atg,
  dk4_er_t	 *erp
)
{
#if DK4_HAVE_STRTOD || DK4_HAVE__STRTOD
  double	 val	= 0.0;
  char		*myend	= NULL;
  int		 back	= 0;
  int		 xerr	= 0;
  if ((NULL != rp) && (NULL != src)) {
    errno = 0;
#if DK4_HAVE_STRTOD
    val = strtod(src, &myend);
#else
    val = _strtod(src, &myend);
#endif
    xerr = errno;
    if (NULL != endptr) { *endptr = myend; }
    if (myend != src) {
      switch (atg) {
        case 2: {
	  back = 1;
	} break;
	case 1: {
	  if (NULL != dk4str8_start(myend, NULL)) {
	    dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	  } else {
	    back = 1;
	  }
	} break;
	default: {
	  if ('\0' == *myend) {
	    back = 1;
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	  }
	} break;
      }
      if (1 == back) {
        if (ERANGE == xerr) {
	  if (HUGE_VAL == val) {
	    back = 0;
	    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	  }
	  if ((-HUGE_VAL) == val) {
	    back = 0;
	    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	  }
	  if (0.0 == val) {
	    back = 0;
	    dk4error_set_simple_error_code(erp, DK4_E_MATH_UNDERFLOW);
	  }
	}
      }
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
    }
    if (1 == back) {
      *rp = val;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
#else
#if DK4_USE_PRINTF_SCANF
  double	val	= 0.0;
  int	 	back	= 0;
  if ((NULL != rp) && (NULL != src)) {
    if (1 == sscanf(src, "%lf", &val)) {
      *rp = val;
      back = 1;
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
#else
  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
  return 0;
#endif
#endif
}



int
dk4ma_input_c8_double(
  double	 *rp,
  const char	 *src,
  const char	**endptr,
  int		  atg,
  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);
  back = dk4ma_internal_input_c8_double(rp, src, endptr, atg, erp);
  (void)setlocale(LC_NUMERIC, oldloc);
#else
  back = dk4ma_internal_input_c8_double(rp, src, endptr, atg, erp);
#endif
  return back;
}