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%%	options

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



%%	header

/**	@file	dk4maodo.h	Octal output.
*/

#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 octal 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_octal_unsigned(
  dkChar *dptr, size_t sz, dk4_um_t val, size_t padsz, dk4_er_t *erp
);

#ifdef __cplusplus
}
#endif


%%	module

#include "dk4maodo.h"



$!trace-include



int
dk4ma_write_octal_unsigned(
  dkChar *dptr, size_t sz, dk4_um_t val, size_t padsz, dk4_er_t *erp
)
{
  dkChar	 buf[4*sizeof(dk4_um_t)+16];	/* Buffer */
  size_t	 used		= 0;		/* Number of used chars */
  size_t	 i		= 0;		/* Copy buffer to destination */
  int		 cc		= 1;		/* Flag: Can continue */
  int		 err		= 0;		/* Flag: Error occured */
  int		 back		= 0;		/* Result */
  if ((NULL != dptr) && (0 < sz)) { *dptr = dkT('\0'); }
  if (1 == padsz) {
    padsz = (8 * sizeof(dk4_um_t)) / 3;
    if (0 != ((8 * sizeof(dk4_um_t)) % 3)) {
      padsz++;
    }
  }
  if ((NULL != dptr) && (0 < sz) && (padsz < sz)) {
    do {
      switch ((int)(val % (dk4_um_t)8UL)) {
        case 0: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('0'); } else { err = 1; }
	} break;
	case 1: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('1'); } else { err = 1; }
	} break;
	case 2: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('2'); } else { err = 1; }
	} break;
	case 3: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('3'); } else { err = 1; }
	} break;
	case 4: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('4'); } else { err = 1; }
	} break;
	case 5: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('5'); } else { err = 1; }
	} break;
	case 6: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('6'); } else { err = 1; }
	} break;
	case 7: {
	  if (used < sizeof(buf)) { buf[used++] = dkT('7'); } else { err = 1; }
	} break;
      }
      val = val / (dk4_um_t)8UL;
      if ((dk4_um_t) 0UL == val) { cc = 0; }
    } while ((1 == cc) && (0 == err));
    if (0 == err) {
      if (used < sz) {
        if ((0 < padsz) && (used < padsz)) {
	  for (i = 0; i < (padsz - used); i++) {
	    dptr[i] = dkT('0');
	  }
	  for (i = 0; i < used; i++) {
	    dptr[padsz - 1 -i] = buf[i];
	  }
	  dptr[padsz] = dkT('\0');
	  back = 1;
	} else {
	  for (i = 0; i < used; i++) {
	    dptr[i] = buf[used - 1 - i];
	  }
	  dptr[used] = dkT('\0');
	  back = 1;
	}
      } else {
        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
      }
    } else {					$? "! error, bug"
      dk4error_set_simple_error_code(erp, DK4_E_BUG);
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}