7f28c94eda
The interpreter more or less passes all the tests in the z-machine test suite. It should build for every target except Archos (for which it is disabled). git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24267 a1c6a512-1295-4272-9138-f99709370657
1003 lines
18 KiB
C
1003 lines
18 KiB
C
/* object.c - Object manipulation opcodes
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* Copyright (c) 1995-1997 Stefan Jokisch
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*
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* This file is part of Frotz.
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*
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* Frotz is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Frotz is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "frotz.h"
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#define MAX_OBJECT 2000
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#define O1_PARENT 4
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#define O1_SIBLING 5
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#define O1_CHILD 6
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#define O1_PROPERTY_OFFSET 7
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#define O1_SIZE 9
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#define O4_PARENT 6
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#define O4_SIBLING 8
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#define O4_CHILD 10
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#define O4_PROPERTY_OFFSET 12
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#define O4_SIZE 14
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/*
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* object_address
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*
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* Calculate the address of an object.
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*
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*/
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static zword object_address (zword obj)
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{
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/* zchar obj_num[10]; */
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/* Check object number */
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if (obj > ((h_version <= V3) ? 255 : MAX_OBJECT)) {
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print_string("@Attempt to address illegal object ");
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print_num(obj);
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print_string(". This is normally fatal.");
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new_line();
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runtime_error (ERR_ILL_OBJ);
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}
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/* Return object address */
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if (h_version <= V3)
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return h_objects + ((obj - 1) * O1_SIZE + 62);
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else
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return h_objects + ((obj - 1) * O4_SIZE + 126);
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}/* object_address */
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/*
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* object_name
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*
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* Return the address of the given object's name.
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*
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*/
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zword object_name (zword object)
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{
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zword obj_addr;
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zword name_addr;
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obj_addr = object_address (object);
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/* The object name address is found at the start of the properties */
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if (h_version <= V3)
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obj_addr += O1_PROPERTY_OFFSET;
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else
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obj_addr += O4_PROPERTY_OFFSET;
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LOW_WORD (obj_addr, name_addr)
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return name_addr;
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}/* object_name */
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/*
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* first_property
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*
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* Calculate the start address of the property list associated with
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* an object.
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*
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*/
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static zword first_property (zword obj)
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{
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zword prop_addr;
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zbyte size;
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/* Fetch address of object name */
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prop_addr = object_name (obj);
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/* Get length of object name */
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LOW_BYTE (prop_addr, size)
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/* Add name length to pointer */
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return prop_addr + 1 + 2 * size;
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}/* first_property */
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/*
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* next_property
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*
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* Calculate the address of the next property in a property list.
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*
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*/
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static zword next_property (zword prop_addr)
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{
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zbyte value;
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/* Load the current property id */
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LOW_BYTE (prop_addr, value)
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prop_addr++;
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/* Calculate the length of this property */
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if (h_version <= V3)
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value >>= 5;
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else if (!(value & 0x80))
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value >>= 6;
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else {
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LOW_BYTE (prop_addr, value)
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value &= 0x3f;
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if (value == 0) value = 64; /* demanded by Spec 1.0 */
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}
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/* Add property length to current property pointer */
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return prop_addr + value + 1;
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}/* next_property */
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/*
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* unlink_object
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*
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* Unlink an object from its parent and siblings.
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*
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*/
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static void unlink_object (zword object)
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{
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zword obj_addr;
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zword parent_addr;
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zword sibling_addr;
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if (object == 0) {
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runtime_error (ERR_REMOVE_OBJECT_0);
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return;
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}
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obj_addr = object_address (object);
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if (h_version <= V3) {
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zbyte parent;
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zbyte younger_sibling;
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zbyte older_sibling;
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zbyte zero = 0;
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/* Get parent of object, and return if no parent */
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obj_addr += O1_PARENT;
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LOW_BYTE (obj_addr, parent)
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if (!parent)
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return;
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/* Get (older) sibling of object and set both parent and sibling
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pointers to 0 */
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SET_BYTE (obj_addr, zero)
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obj_addr += O1_SIBLING - O1_PARENT;
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LOW_BYTE (obj_addr, older_sibling)
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SET_BYTE (obj_addr, zero)
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/* Get first child of parent (the youngest sibling of the object) */
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parent_addr = object_address (parent) + O1_CHILD;
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LOW_BYTE (parent_addr, younger_sibling)
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/* Remove object from the list of siblings */
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if (younger_sibling == object)
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SET_BYTE (parent_addr, older_sibling)
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else {
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do {
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sibling_addr = object_address (younger_sibling) + O1_SIBLING;
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LOW_BYTE (sibling_addr, younger_sibling)
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} while (younger_sibling != object);
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SET_BYTE (sibling_addr, older_sibling)
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}
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} else {
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zword parent;
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zword younger_sibling;
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zword older_sibling;
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zword zero = 0;
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/* Get parent of object, and return if no parent */
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obj_addr += O4_PARENT;
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LOW_WORD (obj_addr, parent)
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if (!parent)
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return;
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/* Get (older) sibling of object and set both parent and sibling
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pointers to 0 */
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SET_WORD (obj_addr, zero)
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obj_addr += O4_SIBLING - O4_PARENT;
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LOW_WORD (obj_addr, older_sibling)
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SET_WORD (obj_addr, zero)
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/* Get first child of parent (the youngest sibling of the object) */
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parent_addr = object_address (parent) + O4_CHILD;
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LOW_WORD (parent_addr, younger_sibling)
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/* Remove object from the list of siblings */
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if (younger_sibling == object)
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SET_WORD (parent_addr, older_sibling)
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else {
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do {
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sibling_addr = object_address (younger_sibling) + O4_SIBLING;
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LOW_WORD (sibling_addr, younger_sibling)
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} while (younger_sibling != object);
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SET_WORD (sibling_addr, older_sibling)
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}
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}
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}/* unlink_object */
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/*
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* z_clear_attr, clear an object attribute.
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*
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* zargs[0] = object
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* zargs[1] = number of attribute to be cleared
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*
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*/
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void z_clear_attr (void)
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{
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zword obj_addr;
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zbyte value;
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if (story_id == SHERLOCK)
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if (zargs[1] == 48)
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return;
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if (zargs[1] > ((h_version <= V3) ? 31 : 47))
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runtime_error (ERR_ILL_ATTR);
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/* If we are monitoring attribute assignment display a short note */
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if (f_setup.attribute_assignment) {
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stream_mssg_on ();
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print_string ("@clear_attr ");
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print_object (zargs[0]);
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print_string (" ");
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print_num (zargs[1]);
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stream_mssg_off ();
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}
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if (zargs[0] == 0) {
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runtime_error (ERR_CLEAR_ATTR_0);
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return;
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}
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/* Get attribute address */
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obj_addr = object_address (zargs[0]) + zargs[1] / 8;
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/* Clear attribute bit */
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LOW_BYTE (obj_addr, value)
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value &= ~(0x80 >> (zargs[1] & 7));
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SET_BYTE (obj_addr, value)
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}/* z_clear_attr */
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/*
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* z_jin, branch if the first object is inside the second.
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*
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* zargs[0] = first object
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* zargs[1] = second object
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*
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*/
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void z_jin (void)
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{
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zword obj_addr;
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/* If we are monitoring object locating display a short note */
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if (f_setup.object_locating) {
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stream_mssg_on ();
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print_string ("@jin ");
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print_object (zargs[0]);
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print_string (" ");
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print_object (zargs[1]);
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stream_mssg_off ();
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}
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if (zargs[0] == 0) {
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runtime_error (ERR_JIN_0);
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branch (0 == zargs[1]);
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return;
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}
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obj_addr = object_address (zargs[0]);
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if (h_version <= V3) {
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zbyte parent;
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/* Get parent id from object */
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obj_addr += O1_PARENT;
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LOW_BYTE (obj_addr, parent)
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/* Branch if the parent is obj2 */
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branch (parent == zargs[1]);
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} else {
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zword parent;
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/* Get parent id from object */
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obj_addr += O4_PARENT;
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LOW_WORD (obj_addr, parent)
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/* Branch if the parent is obj2 */
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branch (parent == zargs[1]);
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}
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}/* z_jin */
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/*
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* z_get_child, store the child of an object.
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*
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* zargs[0] = object
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*
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*/
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void z_get_child (void)
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{
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zword obj_addr;
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/* If we are monitoring object locating display a short note */
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if (f_setup.object_locating) {
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stream_mssg_on ();
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print_string ("@get_child ");
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print_object (zargs[0]);
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stream_mssg_off ();
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}
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if (zargs[0] == 0) {
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runtime_error (ERR_GET_CHILD_0);
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store (0);
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branch (FALSE);
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return;
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}
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obj_addr = object_address (zargs[0]);
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if (h_version <= V3) {
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zbyte child;
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/* Get child id from object */
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obj_addr += O1_CHILD;
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LOW_BYTE (obj_addr, child)
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/* Store child id and branch */
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store (child);
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branch (child);
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} else {
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zword child;
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/* Get child id from object */
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obj_addr += O4_CHILD;
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LOW_WORD (obj_addr, child)
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/* Store child id and branch */
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store (child);
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branch (child);
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}
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}/* z_get_child */
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/*
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* z_get_next_prop, store the number of the first or next property.
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*
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* zargs[0] = object
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* zargs[1] = address of current property (0 gets the first property)
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*
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*/
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void z_get_next_prop (void)
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{
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zword prop_addr;
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zbyte value;
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zbyte mask;
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if (zargs[0] == 0) {
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runtime_error (ERR_GET_NEXT_PROP_0);
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store (0);
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return;
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}
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/* Property id is in bottom five (six) bits */
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mask = (h_version <= V3) ? 0x1f : 0x3f;
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/* Load address of first property */
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prop_addr = first_property (zargs[0]);
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if (zargs[1] != 0) {
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/* Scan down the property list */
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do {
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LOW_BYTE (prop_addr, value)
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prop_addr = next_property (prop_addr);
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} while ((value & mask) > zargs[1]);
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/* Exit if the property does not exist */
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if ((value & mask) != zargs[1])
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runtime_error (ERR_NO_PROP);
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}
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/* Return the property id */
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LOW_BYTE (prop_addr, value)
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store ((zword) (value & mask));
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}/* z_get_next_prop */
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/*
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* z_get_parent, store the parent of an object.
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*
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* zargs[0] = object
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*
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*/
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void z_get_parent (void)
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{
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zword obj_addr;
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/* If we are monitoring object locating display a short note */
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if (f_setup.object_locating) {
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stream_mssg_on ();
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print_string ("@get_parent ");
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print_object (zargs[0]);
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stream_mssg_off ();
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}
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if (zargs[0] == 0) {
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runtime_error (ERR_GET_PARENT_0);
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store (0);
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return;
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}
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obj_addr = object_address (zargs[0]);
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if (h_version <= V3) {
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zbyte parent;
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/* Get parent id from object */
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obj_addr += O1_PARENT;
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LOW_BYTE (obj_addr, parent)
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/* Store parent */
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store (parent);
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} else {
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zword parent;
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/* Get parent id from object */
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obj_addr += O4_PARENT;
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LOW_WORD (obj_addr, parent)
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/* Store parent */
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store (parent);
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}
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}/* z_get_parent */
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/*
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* z_get_prop, store the value of an object property.
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*
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* zargs[0] = object
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* zargs[1] = number of property to be examined
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*
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*/
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void z_get_prop (void)
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{
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zword prop_addr;
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zword wprop_val;
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zbyte bprop_val;
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zbyte value;
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zbyte mask;
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if (zargs[0] == 0) {
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runtime_error (ERR_GET_PROP_0);
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store (0);
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return;
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}
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/* Property id is in bottom five (six) bits */
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mask = (h_version <= V3) ? 0x1f : 0x3f;
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/* Load address of first property */
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prop_addr = first_property (zargs[0]);
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/* Scan down the property list */
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for (;;) {
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LOW_BYTE (prop_addr, value)
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if ((value & mask) <= zargs[1])
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break;
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prop_addr = next_property (prop_addr);
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}
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if ((value & mask) == zargs[1]) { /* property found */
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/* Load property (byte or word sized) */
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prop_addr++;
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if ((h_version <= V3 && !(value & 0xe0)) || (h_version >= V4 && !(value & 0xc0))) {
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LOW_BYTE (prop_addr, bprop_val)
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wprop_val = bprop_val;
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} else LOW_WORD (prop_addr, wprop_val)
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} else { /* property not found */
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/* Load default value */
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prop_addr = h_objects + 2 * (zargs[1] - 1);
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LOW_WORD (prop_addr, wprop_val)
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}
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/* Store the property value */
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store (wprop_val);
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}/* z_get_prop */
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|
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/*
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* z_get_prop_addr, store the address of an object property.
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*
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* zargs[0] = object
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* zargs[1] = number of property to be examined
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*
|
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*/
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|
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void z_get_prop_addr (void)
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{
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zword prop_addr;
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zbyte value;
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zbyte mask;
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if (zargs[0] == 0) {
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runtime_error (ERR_GET_PROP_ADDR_0);
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store (0);
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return;
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}
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|
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if (story_id == BEYOND_ZORK)
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if (zargs[0] > MAX_OBJECT)
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{ store (0); return; }
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|
|
/* 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 */
|