--- /dev/null
+/* object.c - Object manipulation opcodes
+ * Copyright (c) 1995-1997 Stefan Jokisch
+ *
+ * This file is part of Frotz.
+ *
+ * Frotz is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Frotz is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "frotz.h"
+
+#define MAX_OBJECT 2000
+
+#define O1_PARENT 4
+#define O1_SIBLING 5
+#define O1_CHILD 6
+#define O1_PROPERTY_OFFSET 7
+#define O1_SIZE 9
+
+#define O4_PARENT 6
+#define O4_SIBLING 8
+#define O4_CHILD 10
+#define O4_PROPERTY_OFFSET 12
+#define O4_SIZE 14
+
+/*
+ * object_address
+ *
+ * Calculate the address of an object.
+ *
+ */
+
+static zword object_address (zword obj)
+{
+/* zchar obj_num[10]; */
+
+ /* Check object number */
+
+ if (obj > ((h_version <= V3) ? 255 : MAX_OBJECT)) {
+ print_string("@Attempt to address illegal object ");
+ print_num(obj);
+ print_string(". This is normally fatal.");
+ new_line();
+ runtime_error (ERR_ILL_OBJ);
+ }
+
+ /* Return object address */
+
+ if (h_version <= V3)
+ return h_objects + ((obj - 1) * O1_SIZE + 62);
+ else
+ return h_objects + ((obj - 1) * O4_SIZE + 126);
+
+}/* object_address */
+
+/*
+ * object_name
+ *
+ * Return the address of the given object's name.
+ *
+ */
+
+zword object_name (zword object)
+{
+ zword obj_addr;
+ zword name_addr;
+
+ obj_addr = object_address (object);
+
+ /* The object name address is found at the start of the properties */
+
+ if (h_version <= V3)
+ obj_addr += O1_PROPERTY_OFFSET;
+ else
+ obj_addr += O4_PROPERTY_OFFSET;
+
+ LOW_WORD (obj_addr, name_addr)
+
+ return name_addr;
+
+}/* object_name */
+
+/*
+ * first_property
+ *
+ * Calculate the start address of the property list associated with
+ * an object.
+ *
+ */
+
+static zword first_property (zword obj)
+{
+ zword prop_addr;
+ zbyte size;
+
+ /* Fetch address of object name */
+
+ prop_addr = object_name (obj);
+
+ /* Get length of object name */
+
+ LOW_BYTE (prop_addr, size)
+
+ /* Add name length to pointer */
+
+ return prop_addr + 1 + 2 * size;
+
+}/* first_property */
+
+/*
+ * next_property
+ *
+ * Calculate the address of the next property in a property list.
+ *
+ */
+
+static zword next_property (zword prop_addr)
+{
+ zbyte value;
+
+ /* Load the current property id */
+
+ LOW_BYTE (prop_addr, value)
+ prop_addr++;
+
+ /* Calculate the length of this property */
+
+ if (h_version <= V3)
+ value >>= 5;
+ else if (!(value & 0x80))
+ value >>= 6;
+ else {
+
+ LOW_BYTE (prop_addr, value)
+ value &= 0x3f;
+
+ if (value == 0) value = 64; /* demanded by Spec 1.0 */
+
+ }
+
+ /* Add property length to current property pointer */
+
+ return prop_addr + value + 1;
+
+}/* next_property */
+
+/*
+ * unlink_object
+ *
+ * Unlink an object from its parent and siblings.
+ *
+ */
+
+static void unlink_object (zword object)
+{
+ zword obj_addr;
+ zword parent_addr;
+ zword sibling_addr;
+
+ if (object == 0) {
+ runtime_error (ERR_REMOVE_OBJECT_0);
+ return;
+ }
+
+ obj_addr = object_address (object);
+
+ if (h_version <= V3) {
+
+ zbyte parent;
+ zbyte younger_sibling;
+ zbyte older_sibling;
+ zbyte zero = 0;
+
+ /* Get parent of object, and return if no parent */
+
+ obj_addr += O1_PARENT;
+ LOW_BYTE (obj_addr, parent)
+ if (!parent)
+ return;
+
+ /* Get (older) sibling of object and set both parent and sibling
+ pointers to 0 */
+
+ SET_BYTE (obj_addr, zero)
+ obj_addr += O1_SIBLING - O1_PARENT;
+ LOW_BYTE (obj_addr, older_sibling)
+ SET_BYTE (obj_addr, zero)
+
+ /* Get first child of parent (the youngest sibling of the object) */
+
+ parent_addr = object_address (parent) + O1_CHILD;
+ LOW_BYTE (parent_addr, younger_sibling)
+
+ /* Remove object from the list of siblings */
+
+ if (younger_sibling == object)
+ SET_BYTE (parent_addr, older_sibling)
+ else {
+ do {
+ sibling_addr = object_address (younger_sibling) + O1_SIBLING;
+ LOW_BYTE (sibling_addr, younger_sibling)
+ } while (younger_sibling != object);
+ SET_BYTE (sibling_addr, older_sibling)
+ }
+
+ } else {
+
+ zword parent;
+ zword younger_sibling;
+ zword older_sibling;
+ zword zero = 0;
+
+ /* Get parent of object, and return if no parent */
+
+ obj_addr += O4_PARENT;
+ LOW_WORD (obj_addr, parent)
+ if (!parent)
+ return;
+
+ /* Get (older) sibling of object and set both parent and sibling
+ pointers to 0 */
+
+ SET_WORD (obj_addr, zero)
+ obj_addr += O4_SIBLING - O4_PARENT;
+ LOW_WORD (obj_addr, older_sibling)
+ SET_WORD (obj_addr, zero)
+
+ /* Get first child of parent (the youngest sibling of the object) */
+
+ parent_addr = object_address (parent) + O4_CHILD;
+ LOW_WORD (parent_addr, younger_sibling)
+
+ /* Remove object from the list of siblings */
+
+ if (younger_sibling == object)
+ SET_WORD (parent_addr, older_sibling)
+ else {
+ do {
+ sibling_addr = object_address (younger_sibling) + O4_SIBLING;
+ LOW_WORD (sibling_addr, younger_sibling)
+ } while (younger_sibling != object);
+ SET_WORD (sibling_addr, older_sibling)
+ }
+
+ }
+
+}/* unlink_object */
+
+/*
+ * z_clear_attr, clear an object attribute.
+ *
+ * zargs[0] = object
+ * zargs[1] = number of attribute to be cleared
+ *
+ */
+
+void z_clear_attr (void)
+{
+ zword obj_addr;
+ zbyte value;
+
+ if (story_id == SHERLOCK)
+ if (zargs[1] == 48)
+ return;
+
+ if (zargs[1] > ((h_version <= V3) ? 31 : 47))
+ runtime_error (ERR_ILL_ATTR);
+
+ /* If we are monitoring attribute assignment display a short note */
+
+ if (f_setup.attribute_assignment) {
+ stream_mssg_on ();
+ print_string ("@clear_attr ");
+ print_object (zargs[0]);
+ print_string (" ");
+ print_num (zargs[1]);
+ stream_mssg_off ();
+ }
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_CLEAR_ATTR_0);
+ return;
+ }
+
+ /* Get attribute address */
+
+ obj_addr = object_address (zargs[0]) + zargs[1] / 8;
+
+ /* Clear attribute bit */
+
+ LOW_BYTE (obj_addr, value)
+ value &= ~(0x80 >> (zargs[1] & 7));
+ SET_BYTE (obj_addr, value)
+
+}/* z_clear_attr */
+
+/*
+ * z_jin, branch if the first object is inside the second.
+ *
+ * zargs[0] = first object
+ * zargs[1] = second object
+ *
+ */
+
+void z_jin (void)
+{
+ zword obj_addr;
+
+ /* If we are monitoring object locating display a short note */
+
+ if (f_setup.object_locating) {
+ stream_mssg_on ();
+ print_string ("@jin ");
+ print_object (zargs[0]);
+ print_string (" ");
+ print_object (zargs[1]);
+ stream_mssg_off ();
+ }
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_JIN_0);
+ branch (0 == zargs[1]);
+ return;
+ }
+
+ obj_addr = object_address (zargs[0]);
+
+ if (h_version <= V3) {
+
+ zbyte parent;
+
+ /* Get parent id from object */
+
+ obj_addr += O1_PARENT;
+ LOW_BYTE (obj_addr, parent)
+
+ /* Branch if the parent is obj2 */
+
+ branch (parent == zargs[1]);
+
+ } else {
+
+ zword parent;
+
+ /* Get parent id from object */
+
+ obj_addr += O4_PARENT;
+ LOW_WORD (obj_addr, parent)
+
+ /* Branch if the parent is obj2 */
+
+ branch (parent == zargs[1]);
+
+ }
+
+}/* z_jin */
+
+/*
+ * z_get_child, store the child of an object.
+ *
+ * zargs[0] = object
+ *
+ */
+
+void z_get_child (void)
+{
+ zword obj_addr;
+
+ /* If we are monitoring object locating display a short note */
+
+ if (f_setup.object_locating) {
+ stream_mssg_on ();
+ print_string ("@get_child ");
+ print_object (zargs[0]);
+ stream_mssg_off ();
+ }
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_GET_CHILD_0);
+ store (0);
+ branch (FALSE);
+ return;
+ }
+
+ obj_addr = object_address (zargs[0]);
+
+ if (h_version <= V3) {
+
+ zbyte child;
+
+ /* Get child id from object */
+
+ obj_addr += O1_CHILD;
+ LOW_BYTE (obj_addr, child)
+
+ /* Store child id and branch */
+
+ store (child);
+ branch (child);
+
+ } else {
+
+ zword child;
+
+ /* Get child id from object */
+
+ obj_addr += O4_CHILD;
+ LOW_WORD (obj_addr, child)
+
+ /* Store child id and branch */
+
+ store (child);
+ branch (child);
+
+ }
+
+}/* z_get_child */
+
+/*
+ * z_get_next_prop, store the number of the first or next property.
+ *
+ * zargs[0] = object
+ * zargs[1] = address of current property (0 gets the first property)
+ *
+ */
+
+void z_get_next_prop (void)
+{
+ zword prop_addr;
+ zbyte value;
+ zbyte mask;
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_GET_NEXT_PROP_0);
+ store (0);
+ return;
+ }
+
+ /* Property id is in bottom five (six) bits */
+
+ mask = (h_version <= V3) ? 0x1f : 0x3f;
+
+ /* Load address of first property */
+
+ prop_addr = first_property (zargs[0]);
+
+ if (zargs[1] != 0) {
+
+ /* Scan down the property list */
+
+ do {
+ LOW_BYTE (prop_addr, value)
+ prop_addr = next_property (prop_addr);
+ } while ((value & mask) > zargs[1]);
+
+ /* Exit if the property does not exist */
+
+ if ((value & mask) != zargs[1])
+ runtime_error (ERR_NO_PROP);
+
+ }
+
+ /* Return the property id */
+
+ LOW_BYTE (prop_addr, value)
+ store ((zword) (value & mask));
+
+}/* z_get_next_prop */
+
+/*
+ * z_get_parent, store the parent of an object.
+ *
+ * zargs[0] = object
+ *
+ */
+
+void z_get_parent (void)
+{
+ zword obj_addr;
+
+ /* If we are monitoring object locating display a short note */
+
+ if (f_setup.object_locating) {
+ stream_mssg_on ();
+ print_string ("@get_parent ");
+ print_object (zargs[0]);
+ stream_mssg_off ();
+ }
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_GET_PARENT_0);
+ store (0);
+ return;
+ }
+
+ obj_addr = object_address (zargs[0]);
+
+ if (h_version <= V3) {
+
+ zbyte parent;
+
+ /* Get parent id from object */
+
+ obj_addr += O1_PARENT;
+ LOW_BYTE (obj_addr, parent)
+
+ /* Store parent */
+
+ store (parent);
+
+ } else {
+
+ zword parent;
+
+ /* Get parent id from object */
+
+ obj_addr += O4_PARENT;
+ LOW_WORD (obj_addr, parent)
+
+ /* Store parent */
+
+ store (parent);
+
+ }
+
+}/* z_get_parent */
+
+/*
+ * z_get_prop, store the value of an object property.
+ *
+ * zargs[0] = object
+ * zargs[1] = number of property to be examined
+ *
+ */
+
+void z_get_prop (void)
+{
+ zword prop_addr;
+ zword wprop_val;
+ zbyte bprop_val;
+ zbyte value;
+ zbyte mask;
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_GET_PROP_0);
+ store (0);
+ return;
+ }
+
+ /* Property id is in bottom five (six) bits */
+
+ mask = (h_version <= V3) ? 0x1f : 0x3f;
+
+ /* Load address of first property */
+
+ prop_addr = first_property (zargs[0]);
+
+ /* Scan down the property list */
+
+ for (;;) {
+ LOW_BYTE (prop_addr, value)
+ if ((value & mask) <= zargs[1])
+ break;
+ prop_addr = next_property (prop_addr);
+ }
+
+ if ((value & mask) == zargs[1]) { /* property found */
+
+ /* Load property (byte or word sized) */
+
+ prop_addr++;
+
+ if ((h_version <= V3 && !(value & 0xe0)) || (h_version >= V4 && !(value & 0xc0))) {
+
+ LOW_BYTE (prop_addr, bprop_val)
+ wprop_val = bprop_val;
+
+ } else LOW_WORD (prop_addr, wprop_val)
+
+ } else { /* property not found */
+
+ /* Load default value */
+
+ prop_addr = h_objects + 2 * (zargs[1] - 1);
+ LOW_WORD (prop_addr, wprop_val)
+
+ }
+
+ /* Store the property value */
+
+ store (wprop_val);
+
+}/* z_get_prop */
+
+/*
+ * z_get_prop_addr, store the address of an object property.
+ *
+ * zargs[0] = object
+ * zargs[1] = number of property to be examined
+ *
+ */
+
+void z_get_prop_addr (void)
+{
+ zword prop_addr;
+ zbyte value;
+ zbyte mask;
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_GET_PROP_ADDR_0);
+ store (0);
+ return;
+ }
+
+ if (story_id == BEYOND_ZORK)
+ if (zargs[0] > MAX_OBJECT)
+ { store (0); return; }
+
+ /* Property id is in bottom five (six) bits */
+
+ mask = (h_version <= V3) ? 0x1f : 0x3f;
+
+ /* Load address of first property */
+
+ prop_addr = first_property (zargs[0]);
+
+ /* Scan down the property list */
+
+ for (;;) {
+ LOW_BYTE (prop_addr, value)
+ if ((value & mask) <= zargs[1])
+ break;
+ prop_addr = next_property (prop_addr);
+ }
+
+ /* Calculate the property address or return zero */
+
+ if ((value & mask) == zargs[1]) {
+
+ if (h_version >= V4 && (value & 0x80))
+ prop_addr++;
+ store ((zword) (prop_addr + 1));
+
+ } else store (0);
+
+}/* z_get_prop_addr */
+
+/*
+ * z_get_prop_len, store the length of an object property.
+ *
+ * zargs[0] = address of property to be examined
+ *
+ */
+
+void z_get_prop_len (void)
+{
+ zword addr;
+ zbyte value;
+
+ /* Back up the property pointer to the property id */
+
+ addr = zargs[0] - 1;
+ LOW_BYTE (addr, value)
+
+ /* Calculate length of property */
+
+ if (h_version <= V3)
+ value = (value >> 5) + 1;
+ else if (!(value & 0x80))
+ value = (value >> 6) + 1;
+ else {
+
+ value &= 0x3f;
+
+ if (value == 0) value = 64; /* demanded by Spec 1.0 */
+
+ }
+
+ /* Store length of property */
+
+ store (value);
+
+}/* z_get_prop_len */
+
+/*
+ * z_get_sibling, store the sibling of an object.
+ *
+ * zargs[0] = object
+ *
+ */
+
+void z_get_sibling (void)
+{
+ zword obj_addr;
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_GET_SIBLING_0);
+ store (0);
+ branch (FALSE);
+ return;
+ }
+
+ obj_addr = object_address (zargs[0]);
+
+ if (h_version <= V3) {
+
+ zbyte sibling;
+
+ /* Get sibling id from object */
+
+ obj_addr += O1_SIBLING;
+ LOW_BYTE (obj_addr, sibling)
+
+ /* Store sibling and branch */
+
+ store (sibling);
+ branch (sibling);
+
+ } else {
+
+ zword sibling;
+
+ /* Get sibling id from object */
+
+ obj_addr += O4_SIBLING;
+ LOW_WORD (obj_addr, sibling)
+
+ /* Store sibling and branch */
+
+ store (sibling);
+ branch (sibling);
+
+ }
+
+}/* z_get_sibling */
+
+/*
+ * z_insert_obj, make an object the first child of another object.
+ *
+ * zargs[0] = object to be moved
+ * zargs[1] = destination object
+ *
+ */
+
+void z_insert_obj (void)
+{
+ zword obj1 = zargs[0];
+ zword obj2 = zargs[1];
+ zword obj1_addr;
+ zword obj2_addr;
+
+ /* If we are monitoring object movements display a short note */
+
+ if (f_setup.object_movement) {
+ stream_mssg_on ();
+ print_string ("@move_obj ");
+ print_object (obj1);
+ print_string (" ");
+ print_object (obj2);
+ stream_mssg_off ();
+ }
+
+ if (obj1 == 0) {
+ runtime_error (ERR_MOVE_OBJECT_0);
+ return;
+ }
+
+ if (obj2 == 0) {
+ runtime_error (ERR_MOVE_OBJECT_TO_0);
+ return;
+ }
+
+ /* Get addresses of both objects */
+
+ obj1_addr = object_address (obj1);
+ obj2_addr = object_address (obj2);
+
+ /* Remove object 1 from current parent */
+
+ unlink_object (obj1);
+
+ /* Make object 1 first child of object 2 */
+
+ if (h_version <= V3) {
+
+ zbyte child;
+
+ obj1_addr += O1_PARENT;
+ SET_BYTE (obj1_addr, obj2)
+ obj2_addr += O1_CHILD;
+ LOW_BYTE (obj2_addr, child)
+ SET_BYTE (obj2_addr, obj1)
+ obj1_addr += O1_SIBLING - O1_PARENT;
+ SET_BYTE (obj1_addr, child)
+
+ } else {
+
+ zword child;
+
+ obj1_addr += O4_PARENT;
+ SET_WORD (obj1_addr, obj2)
+ obj2_addr += O4_CHILD;
+ LOW_WORD (obj2_addr, child)
+ SET_WORD (obj2_addr, obj1)
+ obj1_addr += O4_SIBLING - O4_PARENT;
+ SET_WORD (obj1_addr, child)
+
+ }
+
+}/* z_insert_obj */
+
+/*
+ * z_put_prop, set the value of an object property.
+ *
+ * zargs[0] = object
+ * zargs[1] = number of property to set
+ * zargs[2] = value to set property to
+ *
+ */
+
+void z_put_prop (void)
+{
+ zword prop_addr;
+ zword value;
+ zbyte mask;
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_PUT_PROP_0);
+ return;
+ }
+
+ /* Property id is in bottom five or six bits */
+
+ mask = (h_version <= V3) ? 0x1f : 0x3f;
+
+ /* Load address of first property */
+
+ prop_addr = first_property (zargs[0]);
+
+ /* Scan down the property list */
+
+ for (;;) {
+ LOW_BYTE (prop_addr, value)
+ if ((value & mask) <= zargs[1])
+ break;
+ prop_addr = next_property (prop_addr);
+ }
+
+ /* Exit if the property does not exist */
+
+ if ((value & mask) != zargs[1])
+ runtime_error (ERR_NO_PROP);
+
+ /* Store the new property value (byte or word sized) */
+
+ prop_addr++;
+
+ if ((h_version <= V3 && !(value & 0xe0)) || (h_version >= V4 && !(value & 0xc0))) {
+ zbyte v = zargs[2];
+ SET_BYTE (prop_addr, v)
+ } else {
+ zword v = zargs[2];
+ SET_WORD (prop_addr, v)
+ }
+
+}/* z_put_prop */
+
+/*
+ * z_remove_obj, unlink an object from its parent and siblings.
+ *
+ * zargs[0] = object
+ *
+ */
+
+void z_remove_obj (void)
+{
+
+ /* If we are monitoring object movements display a short note */
+
+ if (f_setup.object_movement) {
+ stream_mssg_on ();
+ print_string ("@remove_obj ");
+ print_object (zargs[0]);
+ stream_mssg_off ();
+ }
+
+ /* Call unlink_object to do the job */
+
+ unlink_object (zargs[0]);
+
+}/* z_remove_obj */
+
+/*
+ * z_set_attr, set an object attribute.
+ *
+ * zargs[0] = object
+ * zargs[1] = number of attribute to set
+ *
+ */
+
+void z_set_attr (void)
+{
+ zword obj_addr;
+ zbyte value;
+
+ if (story_id == SHERLOCK)
+ if (zargs[1] == 48)
+ return;
+
+ if (zargs[1] > ((h_version <= V3) ? 31 : 47))
+ runtime_error (ERR_ILL_ATTR);
+
+ /* If we are monitoring attribute assignment display a short note */
+
+ if (f_setup.attribute_assignment) {
+ stream_mssg_on ();
+ print_string ("@set_attr ");
+ print_object (zargs[0]);
+ print_string (" ");
+ print_num (zargs[1]);
+ stream_mssg_off ();
+ }
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_SET_ATTR_0);
+ return;
+ }
+
+ /* Get attribute address */
+
+ obj_addr = object_address (zargs[0]) + zargs[1] / 8;
+
+ /* Load attribute byte */
+
+ LOW_BYTE (obj_addr, value)
+
+ /* Set attribute bit */
+
+ value |= 0x80 >> (zargs[1] & 7);
+
+ /* Store attribute byte */
+
+ SET_BYTE (obj_addr, value)
+
+}/* z_set_attr */
+
+/*
+ * z_test_attr, branch if an object attribute is set.
+ *
+ * zargs[0] = object
+ * zargs[1] = number of attribute to test
+ *
+ */
+
+void z_test_attr (void)
+{
+ zword obj_addr;
+ zbyte value;
+
+ if (zargs[1] > ((h_version <= V3) ? 31 : 47))
+ runtime_error (ERR_ILL_ATTR);
+
+ /* If we are monitoring attribute testing display a short note */
+
+ if (f_setup.attribute_testing) {
+ stream_mssg_on ();
+ print_string ("@test_attr ");
+ print_object (zargs[0]);
+ print_string (" ");
+ print_num (zargs[1]);
+ stream_mssg_off ();
+ }
+
+ if (zargs[0] == 0) {
+ runtime_error (ERR_TEST_ATTR_0);
+ branch (FALSE);
+ return;
+ }
+
+ /* Get attribute address */
+
+ obj_addr = object_address (zargs[0]) + zargs[1] / 8;
+
+ /* Load attribute byte */
+
+ LOW_BYTE (obj_addr, value)
+
+ /* Test attribute */
+
+ branch (value & (0x80 >> (zargs[1] & 7)));
+
+}/* z_test_attr */
projects / projects / chimara / chimara.git / blobdiff