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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: dk4maami.ctr
*/

/**	@file dk4maami.c The dk4maami module.
*/


#line 116 "dk4maami.ctr"

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maami.h"



#if DK4_HAVE_INTMAX_T

intmax_t
dk4ma_intmax_t_abs(intmax_t a, dk4_er_t *erp)
{
  if (INTMAX_MIN == a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return (((intmax_t)0L <= a) ? a : ((INTMAX_MIN == a) ? INTMAX_MAX : ((intmax_t)0L - a)));
}



intmax_t
dk4ma_intmax_t_add(intmax_t a, intmax_t b, dk4_er_t *erp)
{
  if (((intmax_t)0L < a) && ((intmax_t)0L < b)) {
    if ((INTMAX_MAX - a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if (((intmax_t)0L > a) && ((intmax_t)0L > b)) {
      if (INTMAX_MIN == a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      } else {
        if ((INTMAX_MIN - a) > b) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      }
    }
  }
  return (a + b);
}



intmax_t
dk4ma_intmax_t_sub(intmax_t a, intmax_t b, dk4_er_t *erp)
{
  if (((intmax_t)0L < a) && ((intmax_t)0L > b)) {
    if ((INTMAX_MAX + b) < a) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if (((intmax_t)0L > a) && ((intmax_t)0L < b)) {
      if ((INTMAX_MIN + b) > a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    }
  }
  return (a - b);
}



intmax_t
dk4ma_intmax_t_mul(intmax_t a, intmax_t b, dk4_er_t *erp)
{
  if (((intmax_t)0L != a) && ((intmax_t)0L != b)) {
    if (INTMAX_MIN == a) {
      if ((intmax_t)1L != b) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    } else {
      if (INTMAX_MIN == b) {
        if ((intmax_t)1L != a) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      } else {
        if ((intmax_t)0L < a) {
	  if ((intmax_t)0L < b) {
	    if ((INTMAX_MAX / a) < b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((INTMAX_MIN / a) > b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	} else {
	  if ((intmax_t)0L < b) {
	    if ((INTMAX_MIN / b) > a) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((INTMAX_MAX / ((intmax_t)0L - a)) < ((intmax_t)0L - b)) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	}
      }
    }
  }
  return (a * b);
}



intmax_t
dk4ma_intmax_t_div(intmax_t a, intmax_t b, dk4_er_t *erp)
{
  intmax_t		back	=	0;
  if ((intmax_t)0L != b) {
    if ((INTMAX_MIN == a) && ((intmax_t)(-1L) == b)) {
      back = INTMAX_MAX;
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    } else {
      back = a / b;
    }
  } else {
    if ((intmax_t)0L < a) {
      back = INTMAX_MAX;
    } else {
      if ((intmax_t)0L > a) {
        back = INTMAX_MIN;
      }
    }
    dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
  }
  return back;
}

#endif