i can compile slang and newt with dietlibc now

1 files changed, 1391 insertions, 0 deletions

diff --git a/mdk-stage1/slang/slclass.c b/mdk-stage1/slang/slclass.c
new file mode 100644
index 000000000..733888cb8
--- /dev/null
+++ b/mdk-stage1/slang/slclass.c
@@ -0,0 +1,1391 @@
+/* User defined objects */
+/* Copyright (c) 1992, 1999, 2001 John E. Davis
+ * This file is part of the S-Lang library.
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Perl Artistic License.
+ */
+#include "slinclud.h"
+
+#include "slang.h"
+#include "_slang.h"
+
+#if _SLANG_OPTIMIZE_FOR_SPEED
+unsigned char _SLclass_Class_Type [256];
+#endif
+
+static SLang_Class_Type *Registered_Types[256];
+SLang_Class_Type *_SLclass_get_class (unsigned char type)
+{
+   SLang_Class_Type *cl;
+
+   cl = Registered_Types [type];
+   if (cl == NULL)
+     SLang_exit_error ("Application error: Type %d not registered", (int) type);
+
+   return cl;
+}
+
+int SLclass_is_class_defined (unsigned char type)
+{
+   return (NULL != Registered_Types[type]);
+}
+
+VOID_STAR _SLclass_get_ptr_to_value (SLang_Class_Type *cl,
+				     SLang_Object_Type *obj)
+{
+   VOID_STAR p;
+
+   switch (cl->cl_class_type)
+     {
+      case SLANG_CLASS_TYPE_MMT:
+      case SLANG_CLASS_TYPE_PTR:
+      case SLANG_CLASS_TYPE_SCALAR:
+	p = (VOID_STAR) &obj->v;
+	break;
+
+      case SLANG_CLASS_TYPE_VECTOR:
+	p = obj->v.ptr_val;
+	break;
+
+      default:
+	p = NULL;
+     }
+   return p;
+}
+
+char *SLclass_get_datatype_name (unsigned char stype)
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (stype);
+   return cl->cl_name;
+}
+
+static int method_undefined_error (unsigned char type, char *method, char *name)
+{
+   if (name == NULL) name = SLclass_get_datatype_name (type);
+
+   SLang_verror (SL_TYPE_MISMATCH, "%s method not defined for %s",
+		 method, name);
+   return -1;
+}
+
+static int
+scalar_vector_bin_op_result (int op, unsigned char a, unsigned char b,
+			     unsigned char *c)
+{
+   (void) a; (void) b;
+   switch (op)
+     {
+      case SLANG_NE:
+      case SLANG_EQ:
+	*c = SLANG_INT_TYPE;
+	return 1;
+     }
+   return 0;
+}
+
+static int
+scalar_vector_bin_op (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)
+{
+   int *c;
+   char *a, *b;
+   unsigned int da, db;
+   unsigned int n, n_max;
+   unsigned int data_type_len;
+   SLang_Class_Type *cl;
+
+   (void) b_type;
+   cl = _SLclass_get_class (a_type);
+
+   data_type_len = cl->cl_sizeof_type;
+
+   a = (char *) ap;
+   b = (char *) bp;
+   c = (int *) cp;
+
+   if (na == 1) da = 0; else da = data_type_len;
+   if (nb == 1) db = 0; else db = data_type_len;
+   if (na > nb) n_max = na; else n_max = nb;
+
+   switch (op)
+     {
+      default:
+	return 0;
+
+      case SLANG_NE:
+	for (n = 0; n < n_max; n++)
+	  {
+	     c[n] = (0 != SLMEMCMP(a, b, data_type_len));
+	     a += da; b += db;
+	  }
+	break;
+
+      case SLANG_EQ:
+	for (n = 0; n < n_max; n++)
+	  {
+	     c[n] = (0 == SLMEMCMP(a, b, data_type_len));
+	     a += da; b += db;
+	  }
+	break;
+     }
+   return 1;
+}
+
+static int scalar_fread (unsigned char type, FILE *fp, VOID_STAR ptr,
+			 unsigned int desired, unsigned int *actual)
+{
+   unsigned int n;
+
+   n = fread ((char *) ptr, _SLclass_get_class (type)->cl_sizeof_type,
+	      desired, fp);
+   *actual = n;
+   return 0;
+}
+
+static int scalar_fwrite (unsigned char type, FILE *fp, VOID_STAR ptr,
+			  unsigned int desired, unsigned int *actual)
+{
+   unsigned int n;
+
+   n = fwrite ((char *) ptr, _SLclass_get_class (type)->cl_sizeof_type,
+	       desired, fp);
+   *actual = n;
+   return 0;
+}
+
+static int vector_apush (unsigned char type, VOID_STAR ptr)
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   return (*cl->cl_push)(type, (VOID_STAR) &ptr);
+}
+
+static int vector_apop (unsigned char type, VOID_STAR ptr)
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   return (*cl->cl_pop)(type, (VOID_STAR) &ptr);
+}
+
+static int default_push_mmt (unsigned char type_unused, VOID_STAR ptr)
+{
+   SLang_MMT_Type *ref;
+
+   (void) type_unused;
+   ref = *(SLang_MMT_Type **) ptr;
+   return SLang_push_mmt (ref);
+}
+
+static void default_destroy_simple (unsigned char type_unused, VOID_STAR ptr_unused)
+{
+   (void) type_unused;
+   (void) ptr_unused;
+}
+
+static void default_destroy_user (unsigned char type, VOID_STAR ptr)
+{
+   (void) type;
+   SLang_free_mmt (*(SLang_MMT_Type **) ptr);
+}
+
+static int default_pop (unsigned char type, VOID_STAR ptr)
+{
+   return SLclass_pop_ptr_obj (type, (VOID_STAR *) ptr);
+}
+
+static int default_datatype_deref (unsigned char type)
+{
+   return method_undefined_error (type, "datatype_deref", NULL);
+}
+
+static int default_acopy (unsigned char type, VOID_STAR from, VOID_STAR to)
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   if (-1 == (*cl->cl_apush) (type, from))
+     return -1;
+   return (*cl->cl_apop) (type, to);
+}
+
+static int default_dereference_object (unsigned char type, VOID_STAR ptr)
+{
+   (void) ptr;
+   return method_undefined_error (type, "dereference", NULL);
+}
+
+static char *default_string (unsigned char stype, VOID_STAR v)
+{
+   char buf [256];
+   char *s;
+#if SLANG_HAS_COMPLEX
+   double *cplx;
+#endif
+   s = buf;
+
+   switch (stype)
+     {
+      case SLANG_STRING_TYPE:
+	s = *(char **) v;
+	break;
+
+      case SLANG_NULL_TYPE:
+	s = "NULL";
+	break;
+
+      case SLANG_DATATYPE_TYPE:
+	s = SLclass_get_datatype_name ((unsigned char) *(int *)v);
+	break;
+
+#if SLANG_HAS_COMPLEX
+      case SLANG_COMPLEX_TYPE:
+	cplx = *(double **) v;
+	if (cplx[1] < 0)
+	  sprintf (s, "(%g - %gi)", cplx [0], -cplx [1]);
+	else
+	  sprintf (s, "(%g + %gi)", cplx [0], cplx [1]);
+	break;
+#endif
+      default:
+	s = SLclass_get_datatype_name (stype);
+     }
+
+   return SLmake_string (s);
+}
+
+static int
+use_cmp_bin_op_result (int op, unsigned char a, unsigned char b,
+		       unsigned char *c)
+{
+   if (a != b)
+     return 0;
+   switch (op)
+     {
+      case SLANG_NE:
+      case SLANG_EQ:
+      case SLANG_LT:
+      case SLANG_LE:
+      case SLANG_GT:
+      case SLANG_GE:
+	*c = SLANG_INT_TYPE;
+	return 1;
+     }
+   return 0;
+}
+
+static int
+use_cmp_bin_op (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)
+{
+   int *c;
+   char *a, *b;
+   unsigned int da, db;
+   unsigned int n, n_max;
+   unsigned int data_type_len;
+   SLang_Class_Type *cl;
+   int (*cmp)(unsigned char, VOID_STAR, VOID_STAR, int *);
+
+   (void) b_type;
+   cl = _SLclass_get_class (a_type);
+   cmp = cl->cl_cmp;
+   data_type_len = cl->cl_sizeof_type;
+
+   a = (char *) ap;
+   b = (char *) bp;
+   c = (int *) cp;
+
+   if (na == 1) da = 0; else da = data_type_len;
+   if (nb == 1) db = 0; else db = data_type_len;
+   if (na > nb) n_max = na; else n_max = nb;
+
+   switch (op)
+     {
+	int result;
+	
+      default:
+	return 0;
+
+      case SLANG_NE:
+	for (n = 0; n < n_max; n++)
+	  {
+	     if (-1 == (*cmp) (a_type, (VOID_STAR)a, (VOID_STAR)b, &result))
+	       return -1;
+	     c[n] = (result != 0);
+	     a += da; b += db;
+	  }
+	break;
+
+      case SLANG_EQ:
+	for (n = 0; n < n_max; n++)
+	  {
+	     if (-1 == (*cmp) (a_type, (VOID_STAR)a, (VOID_STAR)b, &result))
+	       return -1;
+	     c[n] = (result == 0);
+	     a += da; b += db;
+	  }
+	break;
+
+      case SLANG_GT:
+	for (n = 0; n < n_max; n++)
+	  {
+	     if (-1 == (*cmp) (a_type, (VOID_STAR)a, (VOID_STAR)b, &result))
+	       return -1;
+	     c[n] = (result > 0);
+	     a += da; b += db;
+	  }
+	break;
+      case SLANG_GE:
+	for (n = 0; n < n_max; n++)
+	  {
+	     if (-1 == (*cmp) (a_type, (VOID_STAR)a, (VOID_STAR)b, &result))
+	       return -1;
+	     c[n] = (result >= 0);
+	     a += da; b += db;
+	  }
+	break;
+      case SLANG_LT:
+	for (n = 0; n < n_max; n++)
+	  {
+	     if (-1 == (*cmp) (a_type, (VOID_STAR)a, (VOID_STAR)b, &result))
+	       return -1;
+	     c[n] = (result < 0);
+	     a += da; b += db;
+	  }
+	break;
+      case SLANG_LE:
+	for (n = 0; n < n_max; n++)
+	  {
+	     if (-1 == (*cmp) (a_type, (VOID_STAR)a, (VOID_STAR)b, &result))
+	       return -1;
+	     c[n] = (result <= 0);
+	     a += da; b += db;
+	  }
+	break;
+     }
+   return 1;
+}
+
+
+int SLclass_get_class_id (SLang_Class_Type *cl)
+{
+   if (cl == NULL)
+     return -1;
+   return (int) cl->cl_data_type;
+}
+
+SLang_Class_Type *SLclass_allocate_class (char *name)
+{
+   SLang_Class_Type *cl;
+   unsigned int i;
+
+   for (i = 0; i < 256; i++)
+     {
+	cl = Registered_Types [i];
+	if ((cl != NULL)
+	    && (0 == strcmp (cl->cl_name, name)))
+	  {
+	     SLang_verror (SL_DUPLICATE_DEFINITION, "Type name %s already exists", name);
+	     return NULL;
+	  }
+     }
+
+   cl = (SLang_Class_Type *) SLmalloc (sizeof (SLang_Class_Type));
+   if (cl == NULL) return NULL;
+
+   SLMEMSET ((char *) cl, 0, sizeof (SLang_Class_Type));
+
+   if (NULL == (cl->cl_name = SLang_create_slstring (name)))
+     {
+	SLfree ((char *) cl);
+	return NULL;
+     }
+
+   return cl;
+}
+
+static int DataType_Ids [256];
+
+int _SLang_push_datatype (unsigned char data_type)
+{
+   /* This data type could be a copy of another type, e.g., short and
+    * int if they are the same size (Int16 == Short).  So, make sure
+    * we push the original and not the copy. 
+    */
+   data_type = _SLclass_get_class (data_type)->cl_data_type;
+   return SLclass_push_int_obj (SLANG_DATATYPE_TYPE, (int) data_type);
+}
+
+static int datatype_deref (unsigned char type, VOID_STAR ptr)
+{
+   SLang_Class_Type *cl;
+   int status;
+
+   /* The parser generated code for this as if a function call were to be
+    * made.  However, we are calling the deref object routine
+    * instead of the function call.  So, I must simulate the function call.
+    */
+   if (-1 == _SL_increment_frame_pointer ())
+     return -1;
+
+   type = (unsigned char) *(int *) ptr;
+   cl = _SLclass_get_class (type);
+   status = (*cl->cl_datatype_deref) (type);
+
+   (void) _SL_decrement_frame_pointer ();
+   return status;
+}
+
+static int datatype_push (unsigned char type_unused, VOID_STAR ptr)
+{
+   (void) type_unused;
+   return _SLang_push_datatype (*(int *) ptr);
+}
+
+int _SLang_pop_datatype (unsigned char *type)
+{
+   int i;
+
+   if (-1 == SLclass_pop_int_obj (SLANG_DATATYPE_TYPE, &i))
+     return -1;
+
+   *type = (unsigned char) i;
+   return 0;
+}
+
+static int datatype_pop (unsigned char type, VOID_STAR ptr)
+{
+   if (-1 == _SLang_pop_datatype (&type))
+     return -1;
+
+   *(int *) ptr = type;
+   return 0;
+}
+
+int _SLclass_init (void)
+{
+   SLang_Class_Type *cl;
+
+   /* First initialize the container classes.  This is so binary operations
+    * added later will work with them.
+    */
+   if (-1 == _SLarray_init_slarray ())
+     return -1;
+
+   /* DataType_Type */
+   if (NULL == (cl = SLclass_allocate_class ("DataType_Type")))
+     return -1;
+   cl->cl_pop = datatype_pop;
+   cl->cl_push = datatype_push;
+   cl->cl_dereference = datatype_deref;
+   if (-1 == SLclass_register_class (cl, SLANG_DATATYPE_TYPE, sizeof(int),
+				     SLANG_CLASS_TYPE_SCALAR))
+     return -1;
+
+   return 0;
+}
+
+static int register_new_datatype (char *name, unsigned char type)
+{
+   DataType_Ids [type] = type;
+   return SLadd_intrinsic_variable (name, (VOID_STAR) (DataType_Ids + type),
+				    SLANG_DATATYPE_TYPE, 1);
+}
+
+int SLclass_create_synonym (char *name, unsigned char type)
+{
+   if (NULL == _SLclass_get_class (type))
+     return -1;
+
+   return register_new_datatype (name, type);
+}
+
+int _SLclass_copy_class (unsigned char to, unsigned char from)
+{
+   SLang_Class_Type *cl = _SLclass_get_class (from);
+
+   if (Registered_Types[to] != NULL)
+     SLang_exit_error ("Application error: Class already exists");
+
+   Registered_Types[to] = cl;
+
+#if _SLANG_OPTIMIZE_FOR_SPEED
+   if (to != SLANG_UNDEFINED_TYPE)
+     _SLclass_Class_Type [to] = cl->cl_class_type;
+#endif
+   return 0;
+}
+
+int SLclass_register_class (SLang_Class_Type *cl, unsigned char type, unsigned int type_size, unsigned char class_type)
+{
+   char *name;
+   unsigned int i;
+   int can_binop = 1;		       /* scalar_vector_bin_op should work
+					* for all data types.
+					*/
+
+   if (type == SLANG_VOID_TYPE) for (i = 0; i < 256; i++)
+     {
+	if ((Registered_Types[i] == NULL)
+	    && (i != SLANG_VOID_TYPE))
+	  {
+	     type = (unsigned char) i;
+	     break;
+	  }
+     }
+
+   if ((NULL != Registered_Types [type])
+       || (type == SLANG_VOID_TYPE))
+     {
+	SLang_verror (SL_APPLICATION_ERROR, "Class type %d already in use", (int) type);
+	return -1;
+     }
+
+   cl->cl_data_type = type;
+   cl->cl_class_type = class_type;
+   name = cl->cl_name;
+
+   switch (class_type)
+     {
+      case SLANG_CLASS_TYPE_MMT:
+	if (cl->cl_push == NULL) cl->cl_push = default_push_mmt;
+	if (cl->cl_destroy == NULL)
+	  return method_undefined_error (type, "destroy", name);
+	cl->cl_user_destroy_fun = cl->cl_destroy;
+	cl->cl_destroy = default_destroy_user;
+	type_size = sizeof (VOID_STAR);
+	break;
+
+      case SLANG_CLASS_TYPE_SCALAR:
+	if (cl->cl_destroy == NULL) cl->cl_destroy = default_destroy_simple;
+	if ((type_size == 0)
+	    || (type_size > sizeof (_SL_Object_Union_Type)))
+	  {
+	     SLang_verror (SL_INVALID_PARM,
+			   "Type size for %s not appropriate for SCALAR type",
+			   name);
+	     return -1;
+	  }
+	if (cl->cl_pop == NULL)
+	  return method_undefined_error (type, "pop", name);
+	if (cl->cl_fread == NULL) cl->cl_fread = scalar_fread;
+	if (cl->cl_fwrite == NULL) cl->cl_fwrite = scalar_fwrite;
+
+	can_binop = 1;
+	break;
+
+      case SLANG_CLASS_TYPE_PTR:
+	if (cl->cl_destroy == NULL)
+	  return method_undefined_error (type, "destroy", name);
+	type_size = sizeof (VOID_STAR);
+	break;
+
+      case SLANG_CLASS_TYPE_VECTOR:
+	if (cl->cl_destroy == NULL)
+	  return method_undefined_error (type, "destroy", name);
+	if (cl->cl_pop == NULL)
+	  return method_undefined_error (type, "pop", name);
+	cl->cl_apop = vector_apop;
+	cl->cl_apush = vector_apush;
+	cl->cl_adestroy = default_destroy_simple;
+	if (cl->cl_fread == NULL) cl->cl_fread = scalar_fread;
+	if (cl->cl_fwrite == NULL) cl->cl_fwrite = scalar_fwrite;
+	can_binop = 1;
+	break;
+
+      default:
+	SLang_verror (SL_INVALID_PARM, "%s: unknown class type (%d)", name, class_type);
+	return -1;
+     }
+
+#if _SLANG_OPTIMIZE_FOR_SPEED
+   if (type != SLANG_UNDEFINED_TYPE)
+     _SLclass_Class_Type [type] = class_type;
+#endif
+
+   if (type_size == 0)
+     {
+	SLang_verror (SL_INVALID_PARM, "type size must be non-zero for %s", name);
+	return -1;
+     }
+
+   if (cl->cl_string == NULL) cl->cl_string = default_string;
+   if (cl->cl_acopy == NULL) cl->cl_acopy = default_acopy;
+   if (cl->cl_datatype_deref == NULL) cl->cl_datatype_deref = default_datatype_deref;
+
+   if (cl->cl_pop == NULL) cl->cl_pop = default_pop;
+
+   if (cl->cl_push == NULL)
+     return method_undefined_error (type, "push", name);
+
+   if (cl->cl_byte_code_destroy == NULL)
+     cl->cl_byte_code_destroy = cl->cl_destroy;
+   if (cl->cl_push_literal == NULL)
+     cl->cl_push_literal = cl->cl_push;
+
+   if (cl->cl_dereference == NULL)
+     cl->cl_dereference = default_dereference_object;
+
+   if (cl->cl_apop == NULL) cl->cl_apop = cl->cl_pop;
+   if (cl->cl_apush == NULL) cl->cl_apush = cl->cl_push;
+   if (cl->cl_adestroy == NULL) cl->cl_adestroy = cl->cl_destroy;
+   if (cl->cl_push_intrinsic == NULL) cl->cl_push_intrinsic = cl->cl_push;
+
+   if ((cl->cl_foreach == NULL)
+       || (cl->cl_foreach_open == NULL)
+       || (cl->cl_foreach_close == NULL))
+     {
+	cl->cl_foreach = _SLarray_cl_foreach;
+	cl->cl_foreach_open = _SLarray_cl_foreach_open;
+	cl->cl_foreach_close = _SLarray_cl_foreach_close;
+     }
+
+   cl->cl_sizeof_type = type_size;
+
+   if (NULL == (cl->cl_transfer_buf = (VOID_STAR) SLmalloc (type_size)))
+     return -1;
+
+   Registered_Types[type] = cl;
+
+   if (-1 == register_new_datatype (name, type))
+     return -1;
+
+   if (cl->cl_cmp != NULL)
+     {
+	if (-1 == SLclass_add_binary_op (type, type, use_cmp_bin_op, use_cmp_bin_op_result))
+	  return -1;
+     }
+   else if (can_binop
+	    && (-1 == SLclass_add_binary_op (type, type, scalar_vector_bin_op, scalar_vector_bin_op_result)))
+     return -1;
+
+   cl->cl_anytype_typecast = _SLanytype_typecast;
+
+   return 0;
+}
+
+int SLclass_add_math_op (unsigned char type,
+			 int (*handler)(int,
+					unsigned char, VOID_STAR, unsigned int,
+					VOID_STAR),
+			 int (*result) (int, unsigned char, unsigned char *))
+{
+   SLang_Class_Type *cl = _SLclass_get_class (type);
+
+   cl->cl_math_op = handler;
+   cl->cl_math_op_result_type = result;
+   return 0;
+}
+
+int SLclass_add_binary_op (unsigned char a, unsigned char b,
+			   int (*f) (int,
+				     unsigned char, VOID_STAR, unsigned int,
+				     unsigned char, VOID_STAR, unsigned int,
+				     VOID_STAR),
+			   int (*r) (int, unsigned char, unsigned char, unsigned char *))
+{
+   SLang_Class_Type *cl;
+   SL_OOBinary_Type *ab;
+
+   if ((f == NULL) || (r == NULL))
+     {
+	SLang_verror (SL_INVALID_PARM, "SLclass_add_binary_op");
+	return -1;
+     }
+
+   cl = _SLclass_get_class (a);
+   (void) _SLclass_get_class (b);
+
+   if (NULL == (ab = (SL_OOBinary_Type *) SLmalloc (sizeof(SL_OOBinary_Type))))
+     return -1;
+
+   ab->data_type = b;
+   ab->binary_function = f;
+   ab->binary_result = r;
+   ab->next = cl->cl_binary_ops;
+   cl->cl_binary_ops = ab;
+
+   if ((a != SLANG_ARRAY_TYPE)
+       && (b != SLANG_ARRAY_TYPE))
+     {
+	if ((-1 == _SLarray_add_bin_op (a))
+	    || (-1 == _SLarray_add_bin_op (b)))
+	  return -1;
+     }
+
+   return 0;
+}
+
+int SLclass_add_unary_op (unsigned char type,
+			  int (*f)(int,
+				   unsigned char, VOID_STAR, unsigned int,
+				   VOID_STAR),
+			  int (*r)(int, unsigned char, unsigned char *))
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   if ((f == NULL) || (r == NULL))
+     {
+	SLang_verror (SL_INVALID_PARM, "SLclass_add_unary_op");
+	return -1;
+     }
+
+   cl->cl_unary_op = f;
+   cl->cl_unary_op_result_type = r;
+
+   return 0;
+}
+
+int SLclass_add_app_unary_op (unsigned char type,
+			      int (*f)(int,
+				       unsigned char, VOID_STAR, unsigned int,
+				       VOID_STAR),
+			      int (*r)(int, unsigned char, unsigned char *))
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   if ((f == NULL) || (r == NULL))
+     {
+	SLang_verror (SL_INVALID_PARM, "SLclass_add_app_unary_op");
+	return -1;
+     }
+
+   cl->cl_app_unary_op = f;
+   cl->cl_app_unary_op_result_type = r;
+
+   return 0;
+}
+
+int SLclass_set_pop_function (SLang_Class_Type *cl, int (*f)(unsigned char, VOID_STAR))
+{
+   if (cl == NULL) return -1;
+   cl->cl_pop = f;
+
+   return 0;
+}
+
+int SLclass_set_push_function (SLang_Class_Type *cl, int (*f)(unsigned char, VOID_STAR))
+{
+   if (cl == NULL) return -1;
+   cl->cl_push = f;
+
+   return 0;
+}
+
+int SLclass_set_string_function (SLang_Class_Type *cl, char *(*f)(unsigned char, VOID_STAR))
+{
+   if (cl == NULL) return -1;
+
+   cl->cl_string = f;
+   return 0;
+}
+
+int SLclass_set_destroy_function (SLang_Class_Type *cl, void (*f)(unsigned char, VOID_STAR))
+{
+   if (cl == NULL) return -1;
+
+   cl->cl_destroy = f;
+   return 0;
+}
+
+int SLclass_set_sget_function (SLang_Class_Type *cl, int (*f)(unsigned char, char *))
+{
+   if (cl == NULL) return -1;
+   cl->cl_sget = f;
+   return 0;
+}
+
+int SLclass_set_sput_function (SLang_Class_Type *cl, int (*f)(unsigned char, char *))
+{
+   if (cl == NULL) return -1;
+   cl->cl_sput = f;
+   return 0;
+}
+
+int SLclass_set_aget_function (SLang_Class_Type *cl, int (*f)(unsigned char, unsigned int))
+{
+   if (cl == NULL) return -1;
+   cl->cl_aget = f;
+   return 0;
+}
+
+int SLclass_set_aput_function (SLang_Class_Type *cl, int (*f)(unsigned char, unsigned int))
+{
+   if (cl == NULL) return -1;
+   cl->cl_aput = f;
+   return 0;
+}
+
+int SLclass_set_anew_function (SLang_Class_Type *cl, int (*f)(unsigned char, unsigned int))
+{
+   if (cl == NULL) return -1;
+   cl->cl_anew = f;
+   return 0;
+}
+
+/* Misc */
+void _SLclass_type_mismatch_error (unsigned char a, unsigned char b)
+{
+   SLang_verror (SL_TYPE_MISMATCH, "Expecting %s, found %s",
+		 SLclass_get_datatype_name (a),
+		 SLclass_get_datatype_name (b));
+}
+
+/* */
+
+static int null_binary_fun (int op,
+			    unsigned char a, VOID_STAR ap, unsigned int na,
+			    unsigned char b, VOID_STAR bp, unsigned int nb,
+			    VOID_STAR cp)
+{
+   int *ic;
+   unsigned int i;
+   int c;
+
+   (void) ap; (void) bp;
+
+   switch (op)
+     {
+      case SLANG_EQ:
+	c = (a == b);
+	break;
+
+      case SLANG_NE:
+	c = (a != b);
+	break;
+
+      default:
+	return 0;
+     }
+
+   if (na > nb) nb = na;
+   ic = (int *) cp;
+   for (i = 0; i < nb; i++)
+     ic[i] = c;
+
+   return 1;
+}
+
+static char *get_binary_op_string (int op)
+{
+   static char *ops[SLANG_MOD] =
+     {
+	"+", "=", "*", "/", "==", "!=", ">", ">=", "<", "<=", "^",
+	"or", "and", "&", "|", "xor", "shl", "shr", "mod"
+     };
+
+   if ((op > SLANG_MOD) || (op <= 0))
+     return "??";
+   return ops[op - 1];
+}
+
+int (*_SLclass_get_binary_fun (int op,
+			       SLang_Class_Type *a_cl, SLang_Class_Type *b_cl,
+			       SLang_Class_Type **c_cl, int do_error))
+(int,
+ unsigned char, VOID_STAR, unsigned int,
+ unsigned char, VOID_STAR, unsigned int,
+ VOID_STAR)
+{
+   SL_OOBinary_Type *bt;
+   unsigned char a, b, c;
+
+   a = a_cl->cl_data_type;
+   b = b_cl->cl_data_type;
+
+   if ((a == SLANG_NULL_TYPE) || (b == SLANG_NULL_TYPE))
+     {
+	*c_cl = _SLclass_get_class (SLANG_INT_TYPE);
+	return null_binary_fun;
+     }
+
+   bt = a_cl->cl_binary_ops;
+
+   while (bt != NULL)
+     {
+	if (bt->data_type == b)
+	  {
+	     if (1 != (*bt->binary_result)(op, a, b, &c))
+	       break;
+
+	     if (c == a) *c_cl = a_cl;
+	     else if (c == b) *c_cl = b_cl;
+	     else *c_cl = _SLclass_get_class (c);
+
+	     return bt->binary_function;
+	  }
+
+	bt = bt->next;
+     }
+
+   if (do_error)
+     SLang_verror (SL_TYPE_MISMATCH, "%s %s %s is not possible",
+		   a_cl->cl_name, get_binary_op_string (op), b_cl->cl_name);
+
+   *c_cl = NULL;
+   return NULL;
+}
+
+int (*_SLclass_get_unary_fun (int op,
+			      SLang_Class_Type *a_cl,
+			      SLang_Class_Type **b_cl,
+			      int utype))
+(int, unsigned char, VOID_STAR, unsigned int, VOID_STAR)
+{
+   int (*f)(int, unsigned char, VOID_STAR, unsigned int, VOID_STAR);
+   int (*r)(int, unsigned char, unsigned char *);
+   unsigned char a;
+   unsigned char b;
+
+   switch (utype)
+     {
+      case _SLANG_BC_UNARY:
+	f = a_cl->cl_unary_op;
+	r = a_cl->cl_unary_op_result_type;
+	break;
+
+      case _SLANG_BC_MATH_UNARY:
+	f = a_cl->cl_math_op;
+	r = a_cl->cl_math_op_result_type;
+	break;
+
+      case _SLANG_BC_APP_UNARY:
+	f = a_cl->cl_app_unary_op;
+	r = a_cl->cl_app_unary_op_result_type;
+	break;
+
+      default:
+	f = NULL;
+	r = NULL;
+     }
+
+   a = a_cl->cl_data_type;
+   if ((f != NULL) && (r != NULL) && (1 == (*r) (op, a, &b)))
+     {
+	if (a == b)
+	  *b_cl = a_cl;
+	else
+	  *b_cl = _SLclass_get_class (b);
+	return f;
+     }
+
+   SLang_verror (SL_TYPE_MISMATCH, "undefined unary operation/function on %s",
+		 a_cl->cl_name);
+
+   *b_cl = NULL;
+
+   return NULL;
+}
+
+int
+SLclass_typecast (unsigned char to_type, int is_implicit, int allow_array)
+{
+   unsigned char from_type;
+   SLang_Class_Type *cl_to, *cl_from;
+   SLang_Object_Type obj;
+   VOID_STAR ap;
+   VOID_STAR bp;
+   int status;
+
+   if (-1 == SLang_pop (&obj))
+     return -1;
+
+   from_type = obj.data_type;
+   if (from_type == to_type)
+     {
+	SLang_push (&obj);
+	return 0;
+     }
+
+   cl_from = _SLclass_get_class (from_type);
+   
+   /* Since the typecast functions are designed to work on arrays, 
+    * get the pointer to the value instead of just &obj.v.
+    */
+   ap = _SLclass_get_ptr_to_value (cl_from, &obj);
+
+   if ((from_type == SLANG_ARRAY_TYPE)
+       && (allow_array || (to_type != SLANG_ANY_TYPE)))
+     {
+	if (allow_array == 0)
+	  goto return_error;
+
+	cl_to = _SLclass_get_class (SLANG_ARRAY_TYPE);
+	bp = cl_to->cl_transfer_buf;
+	status = _SLarray_typecast (from_type, ap, 1, to_type, bp, is_implicit);
+     }
+   else
+     {
+	int (*t) (unsigned char, VOID_STAR, unsigned int, unsigned char, VOID_STAR);
+
+	if (NULL == (t = _SLclass_get_typecast (from_type, to_type, is_implicit)))
+	  {
+	     SLang_free_object (&obj);
+	     return -1;
+	  }
+
+	cl_to = _SLclass_get_class (to_type);
+	bp = cl_to->cl_transfer_buf;
+	status = (*t) (from_type, ap, 1, to_type, bp);
+     }
+
+   if (1 == status)
+     {
+	if (-1 == (*cl_to->cl_apush)(to_type, bp))
+	  {
+	     (*cl_to->cl_adestroy) (to_type, bp);
+	     SLang_free_object (&obj);
+	     return -1;
+	  }
+
+	/* cl_apush will push a copy, so destry this one */
+	(*cl_to->cl_adestroy) (to_type, bp);
+	SLang_free_object (&obj);
+	return 0;
+     }
+
+   return_error:
+
+   SLang_verror (SL_TYPE_MISMATCH, "Unable to typecast %s to %s",
+		 cl_from->cl_name,
+		 SLclass_get_datatype_name (to_type));
+   SLang_free_object (&obj);
+   return -1;
+}
+
+int (*_SLclass_get_typecast (unsigned char from, unsigned char to, int is_implicit))
+(unsigned char, VOID_STAR, unsigned int,
+ unsigned char, VOID_STAR)
+{
+   SL_Typecast_Type *t;
+   SLang_Class_Type *cl_from;
+
+   cl_from = _SLclass_get_class (from);
+
+   t = cl_from->cl_typecast_funs;
+   while (t != NULL)
+     {
+	if (t->data_type != to)
+	  {
+	     t = t->next;
+	     continue;
+	  }
+
+	if (is_implicit && (t->allow_implicit == 0))
+	  break;
+
+	return t->typecast;
+     }
+
+   if (to == SLANG_ANY_TYPE)
+     return _SLanytype_typecast;
+
+   if ((is_implicit == 0)
+       && (cl_from->cl_void_typecast != NULL))
+     return cl_from->cl_void_typecast;
+
+   SLang_verror (SL_TYPE_MISMATCH, "Unable to typecast %s to %s",
+		 cl_from->cl_name,
+		 SLclass_get_datatype_name (to));
+
+   return NULL;
+}
+
+int
+SLclass_add_typecast (unsigned char from, unsigned char to,
+		      int (*f)_PROTO((unsigned char, VOID_STAR, unsigned int,
+				      unsigned char, VOID_STAR)),
+		      int allow_implicit)
+{
+   SL_Typecast_Type *t;
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (from);
+   if (to == SLANG_VOID_TYPE)
+     {
+	cl->cl_void_typecast = f;
+	return 0;
+     }
+
+   (void) _SLclass_get_class (to);
+
+   if (NULL == (t = (SL_Typecast_Type *) SLmalloc (sizeof (SL_Typecast_Type))))
+     return -1;
+
+   SLMEMSET((char *) t, 0, sizeof(SL_Typecast_Type));
+   t->data_type = to;
+   t->next = cl->cl_typecast_funs;
+   t->typecast = f;
+   t->allow_implicit = allow_implicit;
+
+   cl->cl_typecast_funs = t;
+
+   return 0;
+}
+
+SLang_MMT_Type *SLang_pop_mmt (unsigned char type) /*{{{*/
+{
+   SLang_MMT_Type *mmt;
+
+   if (-1 == SLclass_pop_ptr_obj (type, (VOID_STAR *) &mmt))
+     mmt = NULL;
+   return mmt;
+
+#if 0
+   SLang_Object_Type obj;
+   SLang_Class_Type *cl;
+
+   if (_SLang_pop_object_of_type (type, &obj))
+     return NULL;
+
+   cl = _SLclass_get_class (type);
+   if ((cl->cl_class_type == SLANG_CLASS_TYPE_MMT)
+       && (obj.data_type == type))
+     {
+	return obj.v.ref;
+     }
+
+   _SLclass_type_mismatch_error (type, obj.data_type);
+   SLang_free_object (&obj);
+   return NULL;
+#endif
+}
+
+/*}}}*/
+
+int SLang_push_mmt (SLang_MMT_Type *ref) /*{{{*/
+{
+   if (ref == NULL)
+     return SLang_push_null ();
+
+   ref->count += 1;
+
+   if (0 == SLclass_push_ptr_obj (ref->data_type, (VOID_STAR) ref))
+     return 0;
+
+   ref->count -= 1;
+   return -1;
+}
+
+/*}}}*/
+
+void SLang_inc_mmt (SLang_MMT_Type *ref)
+{
+   if (ref != NULL)
+     ref->count += 1;
+}
+
+VOID_STAR SLang_object_from_mmt (SLang_MMT_Type *ref)
+{
+   if (ref == NULL)
+     return NULL;
+
+   return ref->user_data;
+}
+
+SLang_MMT_Type *SLang_create_mmt (unsigned char t, VOID_STAR p)
+{
+   SLang_MMT_Type *ref;
+
+   (void) _SLclass_get_class (t);      /* check to see if it is registered */
+
+   if (NULL == (ref = (SLang_MMT_Type *) SLmalloc (sizeof (SLang_MMT_Type))))
+     return NULL;
+
+   SLMEMSET ((char *) ref, 0, sizeof (SLang_MMT_Type));
+
+   ref->data_type = t;
+   ref->user_data = p;
+   /* FIXME!!  To be consistent with other types, the reference count should 
+    * be set to 1 here.  However, doing so will require other code changes
+    * involving the use of MMTs.  For instance, SLang_free_mmt would have
+    * to be called after every push of the MMT.
+    */
+   return ref;
+}
+
+void SLang_free_mmt (SLang_MMT_Type *ref)
+{
+   unsigned char type;
+   SLang_Class_Type *cl;
+
+   if (ref == NULL)
+     return;
+
+   /* This can be zero if SLang_create_mmt is called followed
+    * by this routine before anything gets a chance to attach itself
+    * to it.
+    */
+   if (ref->count > 1)
+     {
+	ref->count -= 1;
+	return;
+     }
+
+   type = ref->data_type;
+   cl = _SLclass_get_class (type);
+   (*cl->cl_user_destroy_fun) (type, ref->user_data);
+   SLfree ((char *)ref);
+}
+
+int SLang_push_value (unsigned char type, VOID_STAR v)
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   return (*cl->cl_apush)(type, v);
+}
+
+int SLang_pop_value (unsigned char type, VOID_STAR v)
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   return (*cl->cl_apop)(type, v);
+}
+
+void SLang_free_value (unsigned char type, VOID_STAR v)
+{
+   SLang_Class_Type *cl;
+
+   cl = _SLclass_get_class (type);
+   (*cl->cl_adestroy) (type, v);
+}
+
+/* These routines are very low-level and are designed for application data
+ * types to access the stack from their push/pop methods.  The int and
+ * pointer versions are in slang.c
+ */
+#if SLANG_HAS_FLOAT
+int SLclass_push_double_obj (unsigned char type, double x)
+{
+   SLang_Object_Type obj;
+   obj.data_type = type;
+   obj.v.double_val = x;
+   return SLang_push (&obj);
+}
+int SLclass_push_float_obj (unsigned char type, float x)
+{
+   SLang_Object_Type obj;
+   obj.data_type = type;
+   obj.v.float_val = x;
+   return SLang_push (&obj);
+}
+
+#endif
+
+int SLclass_push_long_obj (unsigned char type, long x)
+{
+   SLang_Object_Type obj;
+   obj.data_type = type;
+   obj.v.long_val = x;
+   return SLang_push (&obj);
+}
+
+int SLclass_push_short_obj (unsigned char type, short x)
+{
+   SLang_Object_Type obj;
+   obj.data_type = type;
+   obj.v.short_val = x;
+   return SLang_push (&obj);
+}
+
+int SLclass_push_char_obj (unsigned char type, char x)
+{
+   SLang_Object_Type obj;
+   obj.data_type = type;
+   obj.v.char_val = x;
+   return SLang_push (&obj);
+}
+
+#if SLANG_HAS_FLOAT
+int SLclass_pop_double_obj (unsigned char type, double *x)
+{
+   SLang_Object_Type obj;
+
+   if (-1 == _SLang_pop_object_of_type (type, &obj, 0))
+     return -1;
+
+   *x = obj.v.double_val;
+   return 0;
+}
+
+int SLclass_pop_float_obj (unsigned char type, float *x)
+{
+   SLang_Object_Type obj;
+
+   if (-1 == _SLang_pop_object_of_type (type, &obj, 0))
+     return -1;
+
+   *x = obj.v.float_val;
+   return 0;
+}
+#endif
+
+int SLclass_pop_long_obj (unsigned char type, long *x)
+{
+   SLang_Object_Type obj;
+
+   if (-1 == _SLang_pop_object_of_type (type, &obj, 0))
+     return -1;
+
+   *x = obj.v.long_val;
+   return 0;
+}
+
+int SLclass_pop_int_obj (unsigned char type, int *x)
+{
+   SLang_Object_Type obj;
+
+   if (-1 == _SLang_pop_object_of_type (type, &obj, 0))
+     return -1;
+
+   *x = obj.v.int_val;
+   return 0;
+}
+
+int SLclass_pop_short_obj (unsigned char type, short *x)
+{
+   SLang_Object_Type obj;
+
+   if (-1 == _SLang_pop_object_of_type (type, &obj, 0))
+     return -1;
+
+   *x = obj.v.short_val;
+   return 0;
+}
+
+int SLclass_pop_char_obj (unsigned char type, char *x)
+{
+   SLang_Object_Type obj;
+
+   if (-1 == _SLang_pop_object_of_type (type, &obj, 0))
+     return -1;
+
+   *x = obj.v.char_val;
+   return 0;
+}
+
+int SLclass_pop_ptr_obj (unsigned char type, VOID_STAR *s)
+{
+   SLang_Object_Type obj;
+
+   if (-1 == _SLang_pop_object_of_type (type, &obj, 0))
+     {
+	*s = (VOID_STAR) NULL;
+	return -1;
+     }
+   *s = obj.v.ptr_val;
+   return 0;
+}
+