/* -*- c -*- */

/* This include file is a template for defining arithmetic binary operations 
 * on arithmetic types.  I realize that doing it this way is not very
 * elegant but it minimizes the number of lines of code and I believe it 
 * promotes clarity.
 */

/* The following macros should be properly defined before including this file:
 *
 *   GENERIC_BINARY_FUNCTION:   The name of the binary function
 *   GENERIC_TYPE:              The class data type
 *   MOD_FUNCTION:	        The function to use for mod
 *   ABS_FUNCTION:              Name of the abs function
 *   SIGN_FUNCTION:             Name of the sign function
 *   GENERIC_UNARY_FUNCTION     Name of the unary function
 *
 * If GENERIC_BIT_OPERATIONS is defined, the bit-level binary operators 
 * will get include.  If the data type has a power operation (SLANG_POW), 
 * then POW_FUNCTION should be defined to return POW_RESULT_TYPE.
 */
#ifdef GENERIC_BINARY_FUNCTION

static int GENERIC_BINARY_FUNCTION 
(int op,
 unsigned char a_type, VOID_STAR ap, unsigned int na,
 unsigned char b_type, VOID_STAR bp, unsigned int nb,
 VOID_STAR cp)
{
   GENERIC_TYPE *c, *a, *b;
#ifdef POW_FUNCTION
   POW_RESULT_TYPE *d;
#endif
   unsigned int n, n_max;
   unsigned int da, db;
   char *cc;

   (void) a_type;		       /* Both SLANG_INT_TYPE */
   (void) b_type;

   a = (GENERIC_TYPE *) ap;
   b = (GENERIC_TYPE *) bp;
   c = (GENERIC_TYPE *) cp;
   cc = (char *) cp;

   if (na == 1) da = 0; else da = 1;
   if (nb == 1) db = 0; else db = 1;

   if (na > nb) n_max = na; else n_max = nb;

   switch (op)
     {
      default:
	return 0;
#ifdef POW_FUNCTION
      case SLANG_POW:
	d = (POW_RESULT_TYPE *) cp;
	for (n = 0; n < n_max; n++)
	  {
	     d[n] = POW_FUNCTION(*a, *b);
	     a += da; b += db;
	  }
	break;
#endif
      case SLANG_PLUS:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a + *b); a += da; b += db;
	  }
	break;

      case SLANG_MINUS:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a - *b); a += da; b += db;
	  }
	break;

      case SLANG_TIMES:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a * *b); a += da; b += db;
	  }
	break;

      case SLANG_DIVIDE:
	for (n = 0; n < n_max; n++)
	  {
	     if (*b == 0)
	       {
		  SLang_Error = SL_DIVIDE_ERROR;
		  return -1;
	       }
	     c[n] = (*a / *b); a += da; b += db;
	  }
	break;

      case SLANG_MOD:
	for (n = 0; n < n_max; n++)
	  {
	     if (*b == 0)
	       {
		  SLang_Error = SL_DIVIDE_ERROR;
		  return -1;
	       }
	     c[n] = MOD_FUNCTION(*a, *b); a += da; b += db;
	  }
	break;

#ifdef GENERIC_BIT_OPERATIONS
      case SLANG_BAND:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a & *b); a += da; b += db;
	  }
	break;

      case SLANG_BXOR:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a ^ *b); a += da; b += db;
	  }
	break;

      case SLANG_BOR:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a | *b); a += da; b += db;
	  }
	break;

      case SLANG_SHL:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a << *b); a += da; b += db;
	  }
	break;

      case SLANG_SHR:
	for (n = 0; n < n_max; n++)
	  {
	     c[n] = (*a >> *b); a += da; b += db;
	  }
	break;
#endif				       /* GENERIC_BIT_OPERATIONS */
      case SLANG_EQ:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a == *b); a += da; b += db;
	  }
	break;

      case SLANG_NE:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a != *b); a += da; b += db;
	  }
	break;

      case SLANG_GT:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a > *b); a += da; b += db;
	  }
	break;

      case SLANG_GE:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a >= *b); a += da; b += db;
	  }
	break;

      case SLANG_LT:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a < *b); a += da; b += db;
	  }
	break;

      case SLANG_LE:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a <= *b); a += da; b += db;
	  }
	break;

      case SLANG_OR:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a || *b); a += da; b += db;
	  }
	break;

      case SLANG_AND:
	for (n = 0; n < n_max; n++)
	  {
	     cc[n] = (*a && *b); a += da; b += db;
	  }
	break;

     }
   return 1;
}

#endif				       /* GENERIC_BINARY_FUNCTION */


#ifdef GENERIC_UNARY_FUNCTION

static int GENERIC_UNARY_FUNCTION
(int op,
 unsigned char a_type, VOID_STAR ap, unsigned int na,
 VOID_STAR bp
 )
{
   GENERIC_TYPE *a, *b;
   unsigned int n;
   int *ib;

   (void) a_type;

   a = (GENERIC_TYPE *) ap;
   b = (GENERIC_TYPE *) bp;

   switch (op)
     {
      default:
	return 0;

      case SLANG_PLUSPLUS:
	for (n = 0; n < na; n++) b[n] = (a[n] + 1);
	break;
      case SLANG_MINUSMINUS:
	for (n = 0; n < na; n++) b[n] = (a[n] - 1);
	break;
      case SLANG_CHS:
	for (n = 0; n < na; n++) b[n] = (GENERIC_TYPE) -(a[n]);
	break;
      case SLANG_SQR:
	for (n = 0; n < na; n++) b[n] = (a[n] * a[n]);
	break;
      case SLANG_MUL2:
	for (n = 0; n < na; n++) b[n] = (2 * a[n]);
	break;
      case SLANG_ABS:
	for (n = 0; n < na; n++) b[n] = ABS_FUNCTION (a[n]);
	break;
      case SLANG_SIGN:
	ib = (int *) bp;
	for (n = 0; n < na; n++)
	  ib[n] = SIGN_FUNCTION(a[n]);
	break;

#ifdef GENERIC_BIT_OPERATIONS
      case SLANG_NOT:
	for (n = 0; n < na; n++) b[n] = !(a[n]);
	break;
      case SLANG_BNOT:
	for (n = 0; n < na; n++) b[n] = ~(a[n]);
	break;
#endif
     }

   return 1;
}
#endif				       /* GENERIC_UNARY_FUNCTION */


#ifdef SCALAR_BINARY_FUNCTION

static int SCALAR_BINARY_FUNCTION (GENERIC_TYPE a, GENERIC_TYPE b, int op)
{
   switch (op)
     {
      default:
	return 1;
	
#ifdef POW_FUNCTION
      case SLANG_POW:
	return PUSH_POW_OBJ_FUN(POW_FUNCTION(a, b));
#endif
      case SLANG_PLUS:
	return PUSH_SCALAR_OBJ_FUN (a + b);
      case SLANG_MINUS:
	return PUSH_SCALAR_OBJ_FUN (a - b);
      case SLANG_TIMES:
	return PUSH_SCALAR_OBJ_FUN (a * b);
      case SLANG_DIVIDE:
	if (b == 0)
	  {
	     SLang_Error = SL_DIVIDE_ERROR;
	     return -1;
	  }
	return PUSH_SCALAR_OBJ_FUN (a / b);
      case SLANG_MOD:
	if (b == 0)
	  {
	     SLang_Error = SL_DIVIDE_ERROR;
	     return -1;
	  }
	return PUSH_SCALAR_OBJ_FUN (MOD_FUNCTION(a,b));
#ifdef GENERIC_BIT_OPERATIONS
      case SLANG_BAND:
	return PUSH_SCALAR_OBJ_FUN (a & b);
      case SLANG_BXOR:
	return PUSH_SCALAR_OBJ_FUN (a ^ b);
      case SLANG_BOR:
	return PUSH_SCALAR_OBJ_FUN (a | b);
      case SLANG_SHL:
	return PUSH_SCALAR_OBJ_FUN (a << b);
      case SLANG_SHR:
	return PUSH_SCALAR_OBJ_FUN (a >> b);
#endif
      case SLANG_GT: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a > b));
      case SLANG_LT: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a < b));
      case SLANG_GE: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a >= b));
      case SLANG_LE: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a <= b));
      case SLANG_EQ: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a == b));
      case SLANG_NE: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a != b));
      case SLANG_OR: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a || b));
      case SLANG_AND: return SLclass_push_char_obj (SLANG_CHAR_TYPE, (char)(a && b));
     }
}

#endif				       /* SCALAR_BINARY_FUNCTION */

#ifdef CMP_FUNCTION
static int CMP_FUNCTION (unsigned char unused, VOID_STAR a, VOID_STAR b, int *c)
{
   GENERIC_TYPE x, y;

   (void) unused;
   x = *(GENERIC_TYPE *) a;
   y = *(GENERIC_TYPE *) b;
   
   if (x > y) *c = 1;
   else if (x == y) *c = 0;
   else *c = -1;
   
   return 0;
}
#endif

#undef CMP_FUNCTION
#undef SCALAR_BINARY_FUNCTION
#undef PUSH_POW_OBJ_FUN
#undef PUSH_SCALAR_OBJ_FUN
#undef GENERIC_BINARY_FUNCTION
#undef GENERIC_UNARY_FUNCTION
#undef GENERIC_BIT_OPERATIONS
#undef GENERIC_TYPE
#undef POW_FUNCTION
#undef POW_RESULT_TYPE
#undef MOD_FUNCTION
#undef ABS_FUNCTION
#undef SIGN_FUNCTION