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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: dk4maal.ctr
*/

/**	@file dk4maal.c The dk4maal module.
*/


#line 132 "dk4maal.ctr"

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maal.h"



long
dk4ma_long_abs(long a, dk4_er_t *erp)
{
  if (LONG_MIN == a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return ((0L <= a) ? a : ((LONG_MIN == a) ? LONG_MAX : (0L - a)));
}



long
dk4ma_long_add(long a, long b, dk4_er_t *erp)
{
  if ((0L < a) && (0L < b)) {
    if ((LONG_MAX - a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0L > a) && (0L > b)) {
      if (LONG_MIN == a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      } else {
        if ((LONG_MIN - a) > b) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      }
    }
  }
  return (a + b);
}



long
dk4ma_long_sub(long a, long b, dk4_er_t *erp)
{
  if ((0L < a) && (0L > b)) {
    if ((LONG_MAX + b) < a) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0L > a) && (0L < b)) {
      if ((LONG_MIN + b) > a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    }
  }
  return (a - b);
}



long
dk4ma_long_mul(long a, long b, dk4_er_t *erp)
{
  if ((0L != a) && (0L != b)) {
    if (LONG_MIN == a) {
      if (1L != b) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    } else {
      if (LONG_MIN == b) {
        if (1L != a) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      } else {
        if (0L < a) {
	  if (0L < b) {
	    if ((LONG_MAX / a) < b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((LONG_MIN / a) > b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	} else {
	  if (0L < b) {
	    if ((LONG_MIN / b) > a) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((LONG_MAX / (0L - a)) < (0L - b)) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	}
      }
    }
  }
  return (a * b);
}



long
dk4ma_long_div(long a, long b, dk4_er_t *erp)
{
  long		back	=	0;
  if (0L != b) {
    if ((LONG_MIN == a) && (-1L == b)) {
      back = LONG_MAX;
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    } else {
      back = a / b;
    }
  } else {
    if (0L < a) {
      back = LONG_MAX;
    } else {
      if (0L > a) {
        back = LONG_MIN;
      }
    }
    dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
  }
  return back;
}



long
dk4ma_long_from(dk4_im_t i, dk4_er_t *erp)
{
	if (((dk4_im_t)(LONG_MAX) < i) || ((dk4_im_t)(LONG_MIN) > i)) {
		dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
	return ((long)i);
}



long
dk4ma_long_from_double(double d, dk4_er_t *erp)
{
	long	back	= 0L;
	if ((double)(LONG_MIN) > d) {
		dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
		back = LONG_MIN;
	}
	else {
		if ((double)(LONG_MAX) < d) {
			dk4error_set_simple_error_code(erp,DK4_E_MATH_OVERFLOW);
			back = LONG_MAX;
		}
		else {
			back = (long)d;
		}
	}
	return back;
}