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/*
Copyright (C) 2014-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/

/*
	WARNING: This file was generated by the dkct program (see
	http://dktools.sourceforge.net/ for details).
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk3mai.ctr
*/

/**	@file dk3mai.c The dk3mai module.
*/


#line 108 "dk3mai.ctr"



#include "dk3ma.h"





#line 116 "dk3mai.ctr"



int
dk3ma_i_abs_ok(int a, int *ec)
{
  if (NULL != ec) { if (DK3_I_MIN == a) { *ec = DK3_ERROR_MATH_OVERFLOW; } }
  return ((0 <= a) ? a : (0 - a));
}



int
dk3ma_i_add_ok(int a, int b, int *ec)
{
  if (NULL != ec) {
    if ((0 < a) && (0 < b)) {
      if((DK3_I_MAX - a) < b) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    } else {
      if ((0 > a) && (0 > b)) {
        if (DK3_I_MIN == a) {
	  *ec = DK3_ERROR_MATH_OVERFLOW;
	} else {
	  if ((DK3_I_MIN - a) > b) {
	    *ec = DK3_ERROR_MATH_OVERFLOW;
	  }
	}
      }
    }
  }
  return (a + b);
}



int
dk3ma_i_sub_ok(int a, int b, int *ec)
{
  if (NULL != ec) {
    if ((0 < a) && (0 > b)) {
      if((DK3_I_MAX + b) < a) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    } else {
      if ((0 > a) && (0 < b)) {
        if((DK3_I_MIN + b) > a) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      }
    }
  }
  return (a - b);
}



#if VERSION_BEFORE_20141018
int
dk3ma_i_mul_ok(int a, int b, int *ec)
{
  if (NULL != ec) {
    if ((0 != a) && (0 != b)) {
      if ((DK3_I_MIN == a) && (1 != b)) {
        *ec = DK3_ERROR_MATH_OVERFLOW;
	goto checksfinished;
      }
      if ((DK3_I_MIN == b) && (1 != a)) {
        *ec = DK3_ERROR_MATH_OVERFLOW;
	goto checksfinished;
      }
      if ((DK3_I_MAX / dk3ma_i_abs_ok(a, ec)) < dk3ma_i_abs_ok(b, ec)) {
        *ec = DK3_ERROR_MATH_OVERFLOW;
	/* goto checksfinished; -- when adding further tests -- */
      }
    }
  }
  checksfinished:
  return (a * b);
}
#else
int
dk3ma_i_mul_ok(int a, int b, int *ec)
{
  if ((NULL != ec) && (0 != a) && (0 != b)) {
    if (DK3_I_MIN == a) {
      if (1 != b) {
        *ec = DK3_ERROR_MATH_OVERFLOW;
      }
      goto finished;
    }
    if (DK3_I_MIN == b) {
      if (1 != a) {
        *ec = DK3_ERROR_MATH_OVERFLOW;
      }
      goto finished;
    }
    if (0 < a) {
      if (0 < b) {
        if ((DK3_I_MAX / a) < b) {
	  *ec = DK3_ERROR_MATH_OVERFLOW;
	}
      } else {
        if ((DK3_I_MIN / a) > b) {
	  *ec = DK3_ERROR_MATH_OVERFLOW;
	}
      }
    } else {
      if (0 < b) {
        if ((DK3_I_MIN / b) > a) {
	  *ec = DK3_ERROR_MATH_OVERFLOW;
	}
      } else {
        if ((DK3_I_MAX / (0 - a)) < (0 - b)) {
	  *ec = DK3_ERROR_MATH_OVERFLOW;
	}
      }
    }
  }
finished:
  return (a * b);
}
#endif



int
dk3ma_i_div_ok(int a, int b, int *ec)
{
  int		back	= 0;
  if (0 != b) {
    if ((DK3_I_MIN == a) && (-1 == b)) {
      back = DK3_I_MAX;
      *ec = DK3_ERROR_MATH_OVERFLOW;
    } else {
      back = a / b;
    }
  } else {
    if (NULL != ec) { *ec = DK3_ERROR_MATH_DIVZERO; }
    if (0 <= a) { back = DK3_I_MAX; }
    else        { back = DK3_I_MIN; }
  }
  return back;
}



int
dk3ma_i_gcd_ok(int a, int b, int *ec)
{
  int	h;
  if (0 > a) {
    if (DK3_I_MIN == a) {
      a = 0;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      goto finished;
    } else {
      a = 0 - a;
    }
  }
  if (0 > b) {
    if (DK3_I_MIN == b) {
      a = 0;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      goto finished;
    } else {
      b = 0 - b;
    }
  }
  while (0 < b) {
    h = a % b;
    a = b;
    b = h;
  }
  if (0 == a) { a = 1; }
  finished:
  return a;
}