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/*
Copyright (C) 2015-2020, 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: dk4maai.ctr
*/

/**	@file dk4maai.c The dk4maai module.
*/


#line 132 "dk4maai.ctr"

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maai.h"



int
dk4ma_int_abs(int a, dk4_er_t *erp)
{
  if (INT_MIN == a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return ((0 <= a) ? a : ((INT_MIN == a) ? INT_MAX : (0 - a)));
}



int
dk4ma_int_add(int a, int b, dk4_er_t *erp)
{
  if ((0 < a) && (0 < b)) {
    if ((INT_MAX - a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0 > a) && (0 > b)) {
      if (INT_MIN == a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      } else {
        if ((INT_MIN - a) > b) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      }
    }
  }
  return (a + b);
}



int
dk4ma_int_sub(int a, int b, dk4_er_t *erp)
{
  if ((0 < a) && (0 > b)) {
    if ((INT_MAX + b) < a) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0 > a) && (0 < b)) {
      if ((INT_MIN + b) > a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    }
  }
  return (a - b);
}



int
dk4ma_int_mul(int a, int b, dk4_er_t *erp)
{
  if ((0 != a) && (0 != b)) {
    if (INT_MIN == a) {
      if (1 != b) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    } else {
      if (INT_MIN == b) {
        if (1 != a) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      } else {
        if (0 < a) {
	  if (0 < b) {
	    if ((INT_MAX / a) < b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((INT_MIN / a) > b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	} else {
	  if (0 < b) {
	    if ((INT_MIN / b) > a) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((INT_MAX / (0 - a)) < (0 - b)) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	}
      }
    }
  }
  return (a * b);
}



int
dk4ma_int_div(int a, int b, dk4_er_t *erp)
{
  int		back	=	0;
  if (0 != b) {
    if ((INT_MIN == a) && (-1 == b)) {
      back = INT_MAX;
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    } else {
      back = a / b;
    }
  } else {
    if (0 < a) {
      back = INT_MAX;
    } else {
      if (0 > a) {
        back = INT_MIN;
      }
    }
    dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
  }
  return back;
}



int
dk4ma_int_from(dk4_im_t i, dk4_er_t *erp)
{
	if (((dk4_im_t)(INT_MAX) < i) || ((dk4_im_t)(INT_MIN) > i)) {
		dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
	return ((int)i);
}



int
dk4ma_int_from_double(double d, dk4_er_t *erp)
{
	int	back	= 0;
	if ((double)(INT_MIN) > d) {
		dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
		back = INT_MIN;
	}
	else {
		if ((double)(INT_MAX) < d) {
			dk4error_set_simple_error_code(erp,DK4_E_MATH_OVERFLOW);
			back = INT_MAX;
		}
		else {
			back = (int)d;
		}
	}
	return back;
}