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%%	options

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



%%	header

/**	@file
	Retrieve size_t value from
	wchar_t string in decimal notation.
*/

#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

/**	Retrieve numeric value from string, decimal notation.
	@param	rp	Pointer to result variable for the found value.
	@param	src	String to check for numeric value.
	@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 in this
			variable.
			The variable points to the correct error position
			only if er.ec is DK4_E_SYNTAX.
	@param	atg	Allow trailing garbage:
			0=no unprocessable trailing bytes allowed,
			1=trailing whitespaces allowed,
			2=any trailing characters 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_MATH_OVERFLOW	if the number is out of range, or
	DK4_E_SYNTAX		if src contains illegal characters.
*/
int
dk4ma_input_wc_dec_size_t(
  size_t	 *rp,
  const wchar_t	 *src,
  const wchar_t	**endptr,
  int		  atg,
  dk4_er_t	 *erp
);

#ifdef __cplusplus
}
#endif

%%	module

#include "dk4maiwddu.h"
#include "dk4maiwdui.h"
#include "dk4numco.h"
#include "dk4strw.h"



#if 0
int
dk4ma_input_wc_dec_size_t(
  size_t	 *rp,
  const wchar_t	 *src,
  const wchar_t	**endptr,
  int		  atg,
  dk4_er_t	 *erp
)
{
  dk4_um_t	res;
  int		back = 0;
  if (0 != dk4ma_input_wc_dec_dk4_um_t(&res, src, endptr, atg, erp)) {
    if (((dk4_um_t)(SIZE_MAX)) >= res) {
      *rp = (size_t)res;
      back = 1;
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  }
  return back;
}
#endif



int
dk4ma_input_wc_dec_size_t(
  size_t	 *rp,
  const wchar_t	 *src,
  const wchar_t	**endptr,
  int		  atg,
  dk4_er_t	 *erp
)
{
  const	wchar_t	*myend	=	NULL;
  dk4_um_t	 um	=	(dk4_um_t)0UL;
  size_t	 res	=	0;
  size_t	 factor	=	1;
  size_t	 nloop	=	0;
  int		 back	=	0;

  if ((NULL != rp) && (NULL != src)) {
    if (0 != dk4ma_input_wc_dec_dk4_um_t(&um, src, &myend, 2, erp)) {
      if (((dk4_um_t)(SIZE_MAX)) >= um) {
        res = (size_t)um;
	if (NULL != myend) {
	  back = 1;
	  switch (*myend) {
	    case 'k': case 'K': { nloop = 1; myend++; } break;
	    case 'm': case 'M': { nloop = 2; myend++; } break;
	    case 'g': case 'G': { nloop = 3; myend++; } break;
	    case 't': case 'T': { nloop = 4; myend++; } break;
	  }
	  while (nloop--) {
	    if ((SIZE_MAX / 1024) >= factor) {
	      factor *= 1024;
	    } else {
	      back = 0;
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	  if (0 != back) {
	    if ((SIZE_MAX / factor) >= res) {
	      res *= factor;
	      switch (atg) {
	        case 2: {
		  *rp = res;
		} break;
		case 1: {
		  myend = dk4strw_start(myend, NULL);
		  if (NULL != myend) {
		    back = 0;
		    dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
		  } else {
		    *rp = res;
		  }
		} break;
		default: {
		  back = 0;
		  dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
		} break;
	      }
	    } else {
	      back = 0;
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	  }
	} else {
	  *rp = res;
	  back = 1;
	}
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  if (NULL != endptr) { *endptr = myend; }
  return back;
}