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%%	options


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


%%	header

/**	@file
	Convert dk4_um_t / dk4_im_t
	to 8 bit character strings in hexadecimal 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

/**	Write unsigned number to char string in hex notation.
	@param	dptr	Pointer to buffer for string.
	@param	sz	Buffer size (number of char).
	@param	val	Value to write.
	@param	padsz	Minimum number of digits, 1 for automatic choice.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
*/
int
dk4ma_write_c8_hex_unsigned(
  char *dptr, size_t sz, dk4_um_t val, size_t padsz, dk4_er_t *erp
);

/**	Write signed number to char string in hex notation.
	@param	dptr	Pointer to buffer for string.
	@param	sz	Buffer size (number of char).
	@param	val	Value to write.
	@param	padsz	Minimum number of digits, 1 for automatic choice.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
*/
int
dk4ma_write_c8_hex_signed(
  char *dptr, size_t sz, dk4_im_t val, size_t padsz, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif



%%	module


#include "dk4mao8h.h"
#include "dk4numco.h"
#include "dk4error.h"



$!trace-include



int
dk4ma_write_c8_hex_unsigned(
  char *dptr, size_t sz, dk4_um_t val, size_t padsz, dk4_er_t *erp
)
{
  char		 buf[4*sizeof(dk4_um_t) + 16];	/* Buffer */
  size_t	 used	=	0;		/* Number of used characters */
  size_t	 i	=	0;		/* Copy buffer to destination */
  int		 cc	=	1;		/* Flag: Can continue */
  int		 err	=	0;		/* Flag: Error occued */
  int		 back	=	0;		/* Function result */
  $? "+ dk4ma_write_c8_hex_unsigned"
  if (NULL != dptr) { *dptr = '\0'; }
  if (1 == padsz) { padsz = 2 * sizeof(dk4_um_t); }
  if ((NULL != dptr) && (0 < sz) && (padsz < sz)) {	$? ". args"
    do {						$? ". loop start"
      switch((int)(val % (dk4_um_t)16UL)) {
        case 0: {					$? ". 0"
	  if(used < sizeof(buf)) { buf[used++] = '0'; } else { err = 1; }
	} break;
	case 1: {					$? ". 1"
	  if(used < sizeof(buf)) { buf[used++] = '1'; } else { err = 1; }
	} break;
	case 2: {					$? ". 2"
	  if(used < sizeof(buf)) { buf[used++] = '2'; } else { err = 1; }
	} break;
	case 3: {					$? ". 3"
	  if(used < sizeof(buf)) { buf[used++] = '3'; } else { err = 1; }
	} break;
	case 4: {					$? ". 4"
	  if(used < sizeof(buf)) { buf[used++] = '4'; } else { err = 1; }
	} break;
	case 5: {					$? ". 5"
	  if(used < sizeof(buf)) { buf[used++] = '5'; } else { err = 1; }
	} break;
	case 6: {					$? ". 6"
	  if(used < sizeof(buf)) { buf[used++] = '6'; } else { err = 1; }
	} break;
	case 7: {					$? ". 7"
	  if(used < sizeof(buf)) { buf[used++] = '7'; } else { err = 1; }
	} break;
	case 8: {					$? ". 8"
	  if(used < sizeof(buf)) { buf[used++] = '8'; } else { err = 1; }
	} break;
	case 9: {					$? ". 9"
	  if(used < sizeof(buf)) { buf[used++] = '9'; } else { err = 1; }
	} break;
	case 10: {					$? ". A"
	  if(used < sizeof(buf)) { buf[used++] = 'A'; } else { err = 1; }
	} break;
	case 11: {					$? ". B"
	  if(used < sizeof(buf)) { buf[used++] = 'B'; } else { err = 1; }
	} break;
	case 12: {					$? ". C"
	  if(used < sizeof(buf)) { buf[used++] = 'C'; } else { err = 1; }
	} break;
	case 13: {					$? ". D"
	  if(used < sizeof(buf)) { buf[used++] = 'D'; } else { err = 1; }
	} break;
	case 14: {					$? ". E"
	  if(used < sizeof(buf)) { buf[used++] = 'E'; } else { err = 1; }
	} break;
	case 15: {					$? ". F"
	  if(used < sizeof(buf)) { buf[used++] = 'F'; } else { err = 1; }
	} break;
      }
      val = val / (dk4_um_t)16UL;
      if ((dk4_um_t)0UL == val) { cc = 0; }
    } while((1 == cc) && (0 == err));
    if (0 == err) {				$? ". no error"
      if (used < sz) {				$? ". sufficient place"
        if ((0 < padsz) && (used < padsz)) {	$? ". padding"
	  for (i = 0; i < (padsz - used); i++) {
	    dptr[i] = '0';
	  }
	  for (i = 0; i < used; i++) {
	    dptr[padsz - 1 - i] = buf[i];
	  }
	  dptr[padsz] = '\0';
	  back = 1;
	} else {				$? ". no padding"
          for (i = 0; i < used; i++) {
	    dptr[i] = buf[used - 1 - i];
	  }
	  dptr[used] = '\0';
	  back = 1;
	}
      } else {					$? "! insufficient place"
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {					$? "! error"
      dk4error_set_simple_error_code(erp, DK4_E_BUG);
    }
  } else {					$? "! args"
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4ma_write_c8_hex_unsigned %d", back
  return back;
}



int
dk4ma_write_c8_hex_signed(
  char *dptr, size_t sz, dk4_im_t val, size_t padsz, dk4_er_t *erp
)
{
  return (dk4ma_write_c8_hex_unsigned(dptr, sz, (dk4_um_t)val, padsz, erp));
}