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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2014-xxxx
license		=	bsd



%%	header

/**	@file	dk3maod8.h Write numbers to decimal char strings.
*/

#include <dk3conf.h>

#include <stdio.h>
#if DK3_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if DK3_HAVE_STDINT
#include <stdint.h>
#endif
#if DK3_HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#if DK3_HAVE_LIMITS_H
#include <limits.h>
#endif
#if DK3_HAVE_MATH_H
#include <math.h>
#endif
#if DK3_HAVE_FLOAT_H
#include <float.h>
#endif

#include <dk3types.h>

#ifdef __cplusplus
extern "C" {
#endif

/**	Convert largest size integer to string.
	@param	rb	Result buffer.
	@param	sz	Result buffer size (number of bytes).
	@param	va	Value to convert.
	@return	1 on success, 0 on error.
*/
int
dk3ma_im_to_c8_string(char *rb, size_t sz, dk3_im_t va);

/**	Convert largest size unsigned integer to string.
	@param	rb	Result buffer.
	@param	sz	Result buffer size (number of bytes).
	@param	va	Value to convert.
	@return	1 on success, 0 on error.
*/
int
dk3ma_um_to_c8_string(char *rb, size_t sz, dk3_um_t va);

#ifdef __cplusplus
}
#endif

%%	module

#include "dk3ma.h"



$!trace-include



/**	Size correction for alignment.
*/
#define	DK3MAOD8_ALIGN(sz,al) \
((0 == (sz % al)) ? (sz) : (((sz / al) + 1) * al))


int
dk3ma_um_to_c8_string(char *rb, size_t sz, dk3_um_t va)
{
  char		 buf[DK3MAOD8_ALIGN((8*DK3_SIZEOF_UM),16)];
  char		*ptr;
  dk3_um_t	 x;
  size_t	 szmax	=	sizeof(buf);
  size_t	 szused	=	0;
  size_t	 i;
  int		 back	=	1;
  char		 c;

  if ((NULL != rb) && (0 < sz)) {
    rb[0] = '\0';
    ptr = buf;
    if (2 <= szmax) {
      do {
        x = va % 10;
        va = va / 10;
        c = '\0';
        switch((int)x) {
          case 0: { c = '0'; } break;
          case 1: { c = '1'; } break;
          case 2: { c = '2'; } break;
          case 3: { c = '3'; } break;
          case 4: { c = '4'; } break;
          case 5: { c = '5'; } break;
          case 6: { c = '6'; } break;
          case 7: { c = '7'; } break;
          case 8: { c = '8'; } break;
          case 9: { c = '9'; } break;
        }
        if (szused < szmax) {
          *(ptr++) = c;
	  szused++;
        } else {
          back = 0;
        }
      } while((DK3_UM_0 != va) && (szused < szmax) && (1 == back));
      if (szused < szmax) {
        buf[szused] = '\0';
      } else {
        back = 0;
        buf[szmax - 1] = '\0';
      }
      if (1 == back) {
        if (szused < sz) {
          for (i = 0; i < szused; i++) {
	    rb[i] = buf[szused - i - 1];
	  }
	  rb[szused] = '\0';
        } else {
          back = 0;
        }
      }
    }
  }
  return back;
}



int
dk3ma_im_to_c8_string(char *rb, size_t sz, dk3_im_t va)
{
  char		*orb;
  dk3_um_t	 umva;
  int		 back	=	0;
  if ((NULL != rb) && (0 < sz)) {
    orb = rb;
    rb[0] = '\0';
    if (2 < sz) {
      if (DK3_IM_0 > va) {
        *(rb++) = '-';
	sz--;
	if (DK3_IM_MIN == va) {
	  umva = (dk3_um_t)DK3_IM_MAX;
	  umva++;
	} else {
	  umva = (dk3_um_t)(DK3_IM_0 - va);
	}
      } else {
        umva = (dk3_um_t)va;
      }
      back = dk3ma_um_to_c8_string(rb, sz, umva);
    }
    if (0 == back) { *orb = '\0'; }
  }
  return back;
}