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%%	options

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



%%	header

/**	@file
	Retrieve dk4_um_t value from
	wchar_t string in decimal 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, 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.
	@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_dk4_um_t(
  dk4_um_t	 *rp,
  const wchar_t	 *src,
  const wchar_t	**endptr,
  int		  atg,
  dk4_er_t	 *erp
);

#ifdef __cplusplus
}
#endif



%%	module



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



$!trace-include



int
dk4ma_input_wc_dec_dk4_um_t(
  dk4_um_t	 *rp,
  const wchar_t	 *src,
  const wchar_t	**endptr,
  int		  atg,
  dk4_er_t	 *erp
)
{
  dk4_um_t	 result	=	(dk4_um_t)0UL;
  dk4_um_t	 op;
  const wchar_t	*ep	=	NULL;
  int		 found	=	0;
  int		 back	=	0;
  int		 cc	=	1;
  $? "+ dk4ma_input_wc_dec_dk4_um_t"
  if ((NULL != rp) && (NULL != src)) {
    do {
      op = (dk4_um_t)0UL;
#if	DK4_SIZEOF_WCHAR_T <= DK4_SIZEOF_INT
      switch (*src) {
        case L'0': { op = (dk4_um_t)0UL; } break;
        case L'1': { op = (dk4_um_t)1UL; } break;
        case L'2': { op = (dk4_um_t)2UL; } break;
        case L'3': { op = (dk4_um_t)3UL; } break;
        case L'4': { op = (dk4_um_t)4UL; } break;
        case L'5': { op = (dk4_um_t)5UL; } break;
        case L'6': { op = (dk4_um_t)6UL; } break;
        case L'7': { op = (dk4_um_t)7UL; } break;
        case L'8': { op = (dk4_um_t)8UL; } break;
        case L'9': { op = (dk4_um_t)9UL; } break;
	case L'\0': {			$? ". string finished"
	  cc = 0;			
	  if (0 != found) {		$? ". digits found"
	    back = 1;
	    *rp = result;
	  } else {			$? ". no digits found"
	    ep = src;			$? ". ep=%ls", TR_LSTR(ep)
	    dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	  }
	} break;
	default: {
	  cc = 0;			$? "! unexpected char"
	  ep = src;			$? ". ep=%ls", TR_LSTR(ep)
	  if (0 != found) {
	    switch (atg) {
	      case 2: {			$? ". trailing garbage allowed"
	        back = 1;
		*rp = result;
	      } break;
	      case 1: {			$? ". trailing whitespace allowed"
	        if (NULL == dk4strw_start(src, NULL)) {
		  back = 1;
		  *rp = result;
		} else {
		  dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
		}
	      } break;
	      default: {		$? ". no trailing chars allowed"
	        dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	      } break;
	    }
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
	  }
	} break;
      }
#else
      if (L'0' == *src) {
        op = (dk4_um_t)0UL;
      } else {
        if (L'1' == *src) {
	  op = (dk4_um_t)1UL;
	} else {
	  if (L'2' == *src) {
	    op = (dk4_um_t)2UL;
	  } else {
	    if (L'3' == *src) {
	      op = (dk4_um_t)3UL;
	    } else {
	      if (L'4' == *src) {
	        op = (dk4_um_t)4UL;
	      } else {
	        if (L'5' == *src) {
		  op = (dk4_um_t)5UL;
		} else {
		  if (L'6' == *src) {
		    op = (dk4_um_t)6UL;
		  } else {
		    if (L'7' == *src) {
		      op = (dk4_um_t)7UL;
		    } else {
		      if (L'8' == *src) {
		        op = (dk4_um_t)8UL;
		      } else {
		        if (L'9' == *src) {
			  op = (dk4_um_t)9UL;
			} else {
			  if (L'\0' == *src) {		/* finalizer */
			    cc = 0;
			    if (0 != found) {
			      back = 1;
			      *rp = result;
			    } else {
			      ep = src;
			      dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
			    }
			  } else {			/* any other */
			    cc = 0;
			    ep = src;
			    if (0 != found) {
			      switch (atg) {
			        case 2: {
				  back = 1;
				  *rp = result;
				} break;
				case 1: {
				  if (NULL == dk4strw_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);
			    }
			  }
			}
		      }
		    }
		  }
		}
	      }
	    }
	  }
	}
      }
#endif
      /* after switch */
      if (0 != cc) {
        found = 1;
	if ((DK4_UM_MAX / (dk4_um_t)10UL) >= result) {
	  result *= (dk4_um_t)10UL;
	  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);
	}
      }
      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_wc_dec_dk4_um_t %d", back
  return back;
}