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%%	options

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



%%	header

/**	@file
	Retrieve dk4_um_t value from
	8 bit character string in hexadecimal notation.
	
	CRT on Windows: Optional, disabling CRT degrades performance.
*/

#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, hexadecimal 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_c8_hex_dk4_um_t(
  dk4_um_t	 *rp,
  const char	 *src,
  const char	**endptr,
  int		  atg,
  dk4_er_t	 *erp
);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4mai8hdu.h"
#include "dk4numco.h"
#include "dk4str8.h"



$!trace-include



int
dk4ma_input_c8_hex_dk4_um_t(
  dk4_um_t	 *rp,
  const char	 *src,
  const char	**endptr,
  int		  atg,
  dk4_er_t	 *erp
)
{
#if VERSION_BEFORE_20141007
  dk4_er_t	  er;
#endif
  dk4_um_t	  result=	(dk4_um_t)0UL;
  dk4_um_t	  op;
  const char	 *ep	=	NULL;
  int		  found	=	0;
  int		  back	=	0;
  int		  cc	=	1;
  $? "+ dk4ma_input_c8_hex_dk4_um_t \"%!8s\"", src
  if ((NULL != rp) && (NULL != src)) {
    if ('0' == src[0]) {
      if (('x' == src[1]) || ('X' == src[1])) { src++; src++; }
    }
#if VERSION_BEFORE_20141007
    dk4error_init(&er);
#endif
    do {
      $? ". src = \"%!8s\"", src
      op = (dk4_um_t)0UL;
      switch (*src) {
        case '0': { op = (dk4_um_t)0UL; } break;
        case '1': { op = (dk4_um_t)1UL; } break;
        case '2': { op = (dk4_um_t)2UL; } break;
        case '3': { op = (dk4_um_t)3UL; } break;
        case '4': { op = (dk4_um_t)4UL; } break;
        case '5': { op = (dk4_um_t)5UL; } break;
        case '6': { op = (dk4_um_t)6UL; } break;
        case '7': { op = (dk4_um_t)7UL; } break;
        case '8': { op = (dk4_um_t)8UL; } break;
        case '9': { op = (dk4_um_t)9UL; } break;
	case 'a': case 'A': { op = (dk4_um_t)10UL; } break;
	case 'b': case 'B': { op = (dk4_um_t)11UL; } break;
	case 'c': case 'C': { op = (dk4_um_t)12UL; } break;
	case 'd': case 'D': { op = (dk4_um_t)13UL; } break;
	case 'e': case 'E': { op = (dk4_um_t)14UL; } break;
	case 'f': case 'F': { op = (dk4_um_t)15UL; } break;
	case '\0': {			$? ". string finished"
	  cc = 0;
	  if (0 != found) {		$? ". digits found"
	    back = 1;
	    *rp = result;
	  } else {			$? ". no digits found"
	    ep = src;
	    dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	  }
	} break;
	default: {
	  cc = 0;
	  ep = src;
	  if (0 != found) {
	    switch (atg) {
	      case 2: {
	        back = 1;
		*rp = result;
	      } break;
	      case 1: {
	        if (NULL == dk4str8_start(src, NULL)) {
		  back = 1;
		  *rp = result;
		} else {
		  dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
		}
	      } break;
	      default: {
	        dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	      } break;
	    }
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	  }
	} break;
      }
      if (0 != cc) {
        found = 1;
#if VERSION_BEFORE_20141007
        result = dk4ma_um_add(
	  dk4ma_um_mul(result, (dk4_um_t)16UL, &er),
	  op, &er
	);
	if (DK4_E_NONE != er.ec) {
	  cc = 0;
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	  ep = src;
	}
#else
	if ((DK4_UM_MAX / (dk4_um_t)16UL) >= result) {
	  result *= (dk4_um_t)16UL;
	  if ((DK4_UM_MAX - op) >= result) {
	    result += op;
	  } else {
	    cc = 0;
	    ep = src;
	    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	  }
	} else {
	  cc = 0;
	  ep = src;
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
#endif
      }
      if (0 != cc) {
        src++;
      }
    } while (0 != cc);
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    if (NULL != src) { ep = src; }
  }
  if (NULL != endptr) { *endptr = ep; }
  $? "- dk4ma_input_c8_hex_dk4_um_t %d", back
  return back;
}