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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd

%%	header

/**	@file
	Arithmetic operations on signed char.
	
	CRT on Windows: Optional.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif



#ifdef __cplusplus
extern "C" {
#endif

/**	Absolute value.
        @param	a	Operand.
        @param	erp	Error report, may be NULL.
        @return	Result on success, SCHAR_MAX if a is SCHAR_MIN
        (overflow is reported in erp).
        
	Error codes: DK4_E_OVERFLOW.
*/
signed char
dk4ma_char_abs(signed char a, dk4_er_t *erp);

/**	Addition.
        @param	a	Left operand.
        @param	b	Right operand.
        @param	erp	Error report, may be NULL.
        @return	Result on success, least significant result bits
        on overflow (see ec component of erp).
        
	Error codes: DK4_E_OVERFLOW.
*/
signed char
dk4ma_char_add(signed char a, signed char b, dk4_er_t *erp);

/**	Subtraction.
        @param	a	Left operand.
        @param	b	Right operand.
        @param	erp	Error report, may be NULL.
        @return	Result on success, least significant result bits
        on overflow (see ec component of erp).
        
	Error codes: DK4_E_OVERFLOW.
*/
signed char
dk4ma_char_sub(signed char a, signed char b, dk4_er_t *erp);

/**	Multiplication.
        @param	a	Left factor.
        @param	b	right factor.
        @param	erp	Error report, may be NULL.
        @return	Result on success, least significant
        bits on overflow (see ec component of erp).
        
	Error codes: DK4_E_OVERFLOW.
*/
signed char
dk4ma_char_mul(signed char a, signed char b, dk4_er_t *erp);

/**	Division.
        @param	a	Counter (left operand).
        @param	b	Denominator (right operand).
        @param	erp	Error report, may be NULL.
        @return	Division result on success,
        SCHAR_MIN, SCHAR_MAX, or 0 on division by zero or overflow
        (see the ec component of erp).
        
	Error codes: DK4_E_OVERFLOW, DK4_E_DIVZERO.
*/
signed char
dk4ma_char_div(signed char a, signed char b, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif

%%	module

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maac.h"



$!trace-include



signed char
dk4ma_char_abs(signed char a, dk4_er_t *erp)
{
  if (SCHAR_MIN == a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return (signed char)((0 <= a) ? a : ((SCHAR_MIN == a) ? SCHAR_MAX : (0 - a)));
}



signed char
dk4ma_char_add(signed char a, signed char b, dk4_er_t *erp)
{
  if ((0 < a) && (0 < b)) {
    if ((SCHAR_MAX - a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0 > a) && (0 > b)) {
      if (SCHAR_MIN == a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      } else {
        if ((SCHAR_MIN - a) > b) {
          dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
        }
      }
    }
  }
  return (signed char)(a + b);
}



signed char
dk4ma_char_sub(signed char a, signed char b, dk4_er_t *erp)
{

  if ((0 < a) && (0 > b)) {
    if ((SCHAR_MAX + b) < a) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0 > a) && (0 < b)) {
      if ((SCHAR_MIN + b) > a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    }
  }
  return (signed char)(a - b);
}



signed char
dk4ma_char_mul(signed char a, signed char b, dk4_er_t *erp)
{
  $? "+ dk4ma_char_mul %d %d", (int)a, (int)b
  if ((0 != a) && (0 != b)) {
    if (SCHAR_MIN == a) {
      if ((signed char)1 != b) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    } else {
      if (SCHAR_MIN == b) {
        if ((signed char)1 != a) {
          dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
        }
      } else {
        if (0 < a) {
          if (0 < b) {
	    if ((SCHAR_MAX / a) < b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((SCHAR_MIN / a) > b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
        } else {
          if (0 < b) {
	    if ((SCHAR_MIN / b) > a) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((SCHAR_MAX / (0 - a)) < (0 - b)) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
        }
      }
    }
  }
  $? "- dk4ma_char_mul %d", (int)((signed char)(a * b))
  return (signed char)(a * b);
}



signed char
dk4ma_char_div(signed char a, signed char b, dk4_er_t *erp)
{
  signed char	back	=	0;
  if (0 != b) {
    if ((SCHAR_MIN == a) && (-1 == b)) {
      back = SCHAR_MAX;
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    } else {
      back = a / b;
    }
  } else {
    if (0 < a) back = SCHAR_MAX;
    if (0 > b) back = SCHAR_MIN;
    dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
  }
  return back;
}