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objects.c
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/* Nitfol - z-machine interpreter using Glk for output.
Copyright (C) 1999 Evin Robertson
This program 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.
This program 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, USA.
The author can be reached at nitfol@deja.com
*/
#include "nitfol.h"
/* attribute/8 will be the byte offset into the object entry for attribute */
#define ATTRIBUTE(n, a) z_memory[z_objecttable + n * OBJSIZE + a / 8]
#define OBJ_ADDR(n) (z_objecttable + (n) * OBJSIZE)
#define PARENTP(n) (OBJ_ADDR(n) + oPARENT)
#define SIBLINGP(n) (OBJ_ADDR(n) + oSIBLING)
#define CHILDP(n) (OBJ_ADDR(n) + oCHILD)
#define PROPSP(n) (OBJ_ADDR(n) + oPROPS)
#define PARENT(n) LOWO(PARENTP(n))
#define SIBLING(n) LOWO(SIBLINGP(n))
#define CHILD(n) LOWO(CHILDP(n))
#define PROPS(n) LOWORD(PROPSP(n))
static zword OBJSIZE;
static zword oPARENT, oSIBLING, oCHILD, oPROPS;
static zword PROP_NUM_MASK, ATTR_COUNT;
static BOOL object_property_loop(zword object, zword *propnum,
zword *location, zword *len);
zword LOWO(zword p)
{
if(zversion >= 4)
return LOWORD(p);
return LOBYTE(p);
}
void LOWOcopy(zword a, zword b)
{
if(zversion >= 4) {
LOWORDcopy(a, b);
} else {
LOBYTEcopy(a, b);
}
}
void LOWOwrite(zword p, zword n)
{
if(zversion >= 4) {
LOWORDwrite(p, n);
} else {
LOBYTEwrite(p, n);
}
}
#ifdef FAST
#define check_obj_valid(obj) TRUE
#define check_attr_valid(attr) TRUE
#else
static BOOL check_obj_valid(zword object)
{
if(object > object_count) { /* Object past the first property table entry */
if(object > maxobjs) { /* Object past the end of dynamic memory */
n_show_error(E_OBJECT, "object number too large", object);
return FALSE;
}
n_show_warn(E_OBJECT, "object number probably too large", object);
}
if(object == 0) {
n_show_error(E_OBJECT, "vile object 0 error from hell", object);
return FALSE;
}
return TRUE;
}
static BOOL check_attr_valid(zword attr)
{
if(attr > ATTR_COUNT) {
n_show_error(E_OBJECT, "attempt to access illegal attribute", attr);
return FALSE;
}
return TRUE;
}
#endif
void objects_init(void)
{
zword object;
if(zversion >= 4) {
OBJSIZE = 14;
oPARENT = 6;
oSIBLING = 8;
oCHILD = 10;
oPROPS = 12;
PROP_NUM_MASK = 0x3f;
ATTR_COUNT = 47;
} else {
OBJSIZE = 9;
oPARENT = 4;
oSIBLING = 5;
oCHILD = 6;
oPROPS = 7;
PROP_NUM_MASK = 0x1f;
ATTR_COUNT = 31;
}
/* Address of objects; we want this to be one before the first object
because there's no object 0 */
z_objecttable = z_propdefaults + PROP_NUM_MASK * ZWORD_SIZE - OBJSIZE;
maxobjs = (dynamic_size - z_objecttable) / OBJSIZE;
obj_first_prop_addr = ZWORD_MASK;
obj_last_prop_addr = 0;
prop_table_start = ZWORD_MASK;
prop_table_end = 0;
/* Count objects in tree, assuming objects end where proptables begin */
for(object = 1; OBJ_ADDR(object) < prop_table_start; object++) {
zword propnum, location, len;
if(PROPS(object) < prop_table_start)
prop_table_start = PROPS(object);
location = 0;
while(object_property_loop(object, &propnum, &location, &len)) {
if(location < obj_first_prop_addr)
obj_first_prop_addr = location;
if(location > obj_last_prop_addr)
obj_last_prop_addr = location;
if(location + len > prop_table_end)
prop_table_end = location + len;
}
}
object_count = object - 1;
if(object_count > maxobjs)
object_count = maxobjs;
}
void op_get_child(void)
{
zword child;
if(!check_obj_valid(operand[0])) {
mop_store_result(0);
mop_skip_branch();
return;
}
debug_object(operand[0], OBJ_GET_INFO);
child = CHILD(operand[0]);
mop_store_result(child);
mop_cond_branch(child != 0);
}
void op_get_parent(void)
{
zword parent;
if(!check_obj_valid(operand[0])) {
mop_store_result(0);
return;
}
debug_object(operand[0], OBJ_GET_INFO);
parent = PARENT(operand[0]);
mop_store_result(parent);
}
void op_get_sibling(void)
{
zword sibling;
if(!check_obj_valid(operand[0])) {
mop_store_result(0);
mop_skip_branch();
return;
}
debug_object(operand[0], OBJ_GET_INFO);
sibling = SIBLING(operand[0]);
mop_store_result(sibling);
mop_cond_branch(sibling != 0);
}
void op_insert_obj(void)
{
zword object = operand[0], dest = operand[1];
if(!check_obj_valid(object) || !check_obj_valid(dest))
return;
#ifndef FAST
{
zword child = object;
int depth = 0;
while(child) {
if(child == dest) {
n_show_error(E_OBJECT, "attempt to place an object inside itself", object);
return;
}
child = CHILD(child);
depth++;
if(depth > maxobjs) {
n_show_error(E_OBJECT, "found objects inside themselves", child);
break;
}
}
}
#endif
op_remove_obj(); /* Remove object operand[0] from object tree */
debug_object(operand[1], OBJ_RECEIVE);
LOWOwrite(PARENTP(object), dest);
LOWOcopy(SIBLINGP(object), CHILDP(dest));
LOWOwrite(CHILDP(dest), object);
}
void op_jin(void)
{
if(!check_obj_valid(operand[0])) {
mop_skip_branch();
return;
}
debug_object(operand[0], OBJ_GET_INFO);
debug_object(operand[1], OBJ_GET_INFO);
mop_cond_branch(PARENT(operand[0]) == operand[1]);
}
void op_remove_obj(void)
{
zword parent, sibling, nextsibling;
zword object = operand[0];
if(!check_obj_valid(object))
return;
parent = PARENT(object);
if(!parent) /* If no parent, do nothing with no error message */
return;
if(!check_obj_valid(parent))
return;
debug_object(operand[0], OBJ_MOVE);
nextsibling = CHILD(parent);
if(nextsibling == object) { /* if it's the first child */
LOWOcopy(CHILDP(parent), SIBLINGP(object));
} else {
unsigned width = 0;
do { /* Loops until the SIBLING(sibling)==object so we can skip over it */
sibling = nextsibling;
if(!check_obj_valid(sibling))
return;
nextsibling = SIBLING(sibling);
#ifndef FAST
if(width++ > maxobjs) { /* If we've looped more times than reasonable */
n_show_error(E_OBJECT, "looped sibling list", parent);
return;
}
#endif
} while(nextsibling != object);
LOWOcopy(SIBLINGP(sibling), SIBLINGP(object));/*make the list skip object*/
}
LOWOwrite(PARENTP(object), 0);
LOWOwrite(SIBLINGP(object), 0);
}
offset object_name(zword object)
{
if(LOBYTE(PROPS(object)))
return PROPS(object) + 1;
else
return 0;
}
void op_print_obj(void)
{
offset short_name_off = object_name(operand[0]);
if(short_name_off)
decodezscii(short_name_off, output_char);
else
n_show_error(E_OBJECT, "attempt to print name of nameless object", operand[0]);
}
/* attribute opcodes: */
void op_clear_attr(void)
{
if(!check_obj_valid(operand[0]) || !check_attr_valid(operand[1]))
return;
debug_attrib(operand[1], operand[0]);
ATTRIBUTE(operand[0], operand[1]) &= ~(b10000000 >> (operand[1] & b0111));
/* shift top bit right to select the appropriate bit and make
a mask from the complement */
}
void op_set_attr(void)
{
if(!check_obj_valid(operand[0]) || !check_attr_valid(operand[1]))
return;
debug_attrib(operand[1], operand[0]);
/* select the bit to be set */
ATTRIBUTE(operand[0], operand[1]) |= (b10000000 >> (operand[1] & b0111));
}
void op_test_attr(void)
{
if(!check_obj_valid(operand[0]) || !check_attr_valid(operand[1])) {
mop_skip_branch();
return;
}
debug_attrib(operand[1], operand[0]);
/* select the bit to be tested */
if(ATTRIBUTE(operand[0], operand[1]) & (b10000000 >> (operand[1] & b0111)))
mop_take_branch();
else
mop_skip_branch();
}
/* property table opcodes: */
/* Helper functions */
/*
* Given the location of the sizebyte, returns the length of the following
* property and sets *size_length to the size of the sizebyte
*/
static zword get_prop_length(zword propoffset, int *size_length)
{
zword prop_length;
zbyte size_byte = LOBYTE(propoffset);
if(zversion >= 4) {
if(size_byte & b10000000) { /* top bit set means two bytes of size info */
*size_length = 2;
prop_length = LOBYTE(propoffset + 1) & b00111111;
if(prop_length == 0)
prop_length = 64;
} else { /* one byte of size info */
*size_length = 1;
if(size_byte & b01000000)
prop_length = 2;
else
prop_length = 1;
}
} else {
prop_length = (size_byte >> 5) + 1;
*size_length = 1;
}
return prop_length;
}
/*
* Loops over all properties of an object, returning FALSE if no more
* Before first call, set *location = 0;
*/
static BOOL object_property_loop(zword object, zword *propnum,
zword *location, zword *len)
{
zword proptable;
int size_byte, size_length;
if(!*location) {
*location = proptable = PROPS(object);
*len = LOBYTE(proptable) * 2 + 1; /* skip the header */
}
proptable = *location;
proptable += *len;
size_byte = LOBYTE(proptable);
*propnum = size_byte & PROP_NUM_MASK;
if(*propnum) {
*len = get_prop_length(proptable, &size_length);
proptable += size_length;
*location = proptable;
return TRUE;
}
return FALSE;
}
static zword get_prop_offset(zword object, zword property, zword *length)
{
zword propnum, location;
location = 0;
while(object_property_loop(object, &propnum, &location, length)) {
if(propnum == property)
return location;
}
return 0;
}
void op_get_next_prop(void)
{
zword proptable = 0;
zword prop_len;
zword prop_num;
if(!check_obj_valid(operand[0])) {
mop_store_result(0);
return;
}
if(operand[1] == 0) {
if(object_property_loop(operand[0], &prop_num, &proptable, &prop_len))
mop_store_result(prop_num);
else
mop_store_result(0);
return;
}
while(object_property_loop(operand[0], &prop_num, &proptable, &prop_len)) {
if(prop_num == operand[1]) {
if(object_property_loop(operand[0], &prop_num, &proptable, &prop_len))
mop_store_result(prop_num);
else
mop_store_result(0);
return;
}
}
n_show_error(E_OBJECT, "get_next_prop on nonexistent property", operand[1]);
mop_store_result(0);
return;
}
void op_get_prop_addr(void)
{
zword proptable;
zword prop_len;
if(!check_obj_valid(operand[0])) {
mop_store_result(0);
return;
}
proptable = get_prop_offset(operand[0], operand[1], &prop_len);
mop_store_result(proptable);
}
void op_get_prop_len(void)
{
int size_length;
zword prop_length;
#ifndef FAST
if(operand[0] < obj_first_prop_addr ||
operand[0] > obj_last_prop_addr) {
if(operand[0] < 64) {
n_show_error(E_OBJECT, "get property length in header", operand[0]);
mop_store_result(0);
return;
}
n_show_warn(E_OBJECT, "get property length at probably bad address", operand[0]);
}
#endif
operand[0]--; /* Skip back a byte for the size byte */
if(zversion >= 4)
if(LOBYTE(operand[0]) & 0x80) { /* test top bit - two bytes of size info */
operand[0]--; /* Skip back another byte */
}
prop_length = get_prop_length(operand[0], &size_length);
mop_store_result(prop_length);
}
void op_get_prop(void)
{
zword prop_length;
zword proptable;
if(!check_obj_valid(operand[0])) {
mop_store_result(0);
return;
}
proptable = get_prop_offset(operand[0], operand[1], &prop_length);
if(proptable == 0) { /* property not provided; use property default */
mop_store_result(LOWORD(z_propdefaults + (operand[1]-1) * ZWORD_SIZE));
return;
}
switch(prop_length) {
case 1:
mop_store_result(LOBYTE(proptable)); break;
#ifndef FAST
default:
n_show_port(E_OBJECT, "get_prop on property with bad length", operand[1]);
#endif
case ZWORD_SIZE:
mop_store_result(LOWORD(proptable));
}
}
void op_put_prop(void)
{
zword prop_length;
zword proptable;
if(!check_obj_valid(operand[0])) {
mop_store_result(0);
return;
}
proptable = get_prop_offset(operand[0], operand[1], &prop_length);
#ifndef FAST
if(proptable == 0) {
n_show_error(E_OBJECT, "attempt to write to nonexistent property", operand[1]);
return;
}
#endif
switch(prop_length) {
case 1:
LOBYTEwrite(proptable, operand[2]); break;
#ifndef FAST
default:
n_show_port(E_OBJECT, "put_prop on property with bad length", operand[1]);
#endif
case ZWORD_SIZE:
LOWORDwrite(proptable, operand[2]); break;
}
}
#ifdef DEBUGGING
BOOL infix_property_loop(zword object, zword *propnum, zword *location, zword *len, zword *nonindivloc, zword *nonindivlen)
{
BOOL status;
if(*location && *propnum > PROP_NUM_MASK) {
*location += *len;
*propnum = LOWORD(*location);
*location += ZWORD_SIZE;
*len = LOBYTE(*location);
(*location)++;
if(*propnum)
return TRUE;
*propnum = 0;
*location = *nonindivloc;
*len = *nonindivlen;
*nonindivloc = 0;
*nonindivlen = 0;
}
status = object_property_loop(object, propnum, location, len);
if(!status)
return FALSE;
if(*propnum == 3) { /* Individual property table */
zword iproptable = LOWORD(*location);
zword ilen;
*propnum = LOWORD(iproptable);
iproptable += ZWORD_SIZE;
ilen = LOBYTE(iproptable);
iproptable++;
if(!*propnum)
return infix_property_loop(object, propnum, location, len, nonindivloc, nonindivlen);
*nonindivloc = *location;
*nonindivlen = *len;
*location = iproptable;
*len = ilen;
}
return TRUE;
}
void infix_move(zword dest, zword object)
{
zword to1 = operand[0], to2 = operand[1];
operand[0] = object; operand[1] = dest;
op_insert_obj();
operand[0] = to1; operand[1] = to2;
}
void infix_remove(zword object)
{
zword to1 = operand[0];
operand[0] = object;
op_remove_obj();
operand[0] = to1;
}
zword infix_parent(zword object)
{
return PARENT(object);
}
zword infix_child(zword object)
{
return CHILD(object);
}
zword infix_sibling(zword object)
{
return SIBLING(object);
}
void infix_set_attrib(zword object, zword attrib)
{
zword to1 = operand[0], to2 = operand[1];
operand[0] = object; operand[1] = attrib;
op_set_attr();
operand[0] = to1; operand[1] = to2;
}
void infix_clear_attrib(zword object, zword attrib)
{
zword to1 = operand[0], to2 = operand[1];
operand[0] = object; operand[1] = attrib;
op_clear_attr();
operand[0] = to1; operand[1] = to2;
}
static void infix_property_display(unsigned prop,
offset proptable, unsigned prop_length)
{
BOOL do_number = TRUE;
BOOL do_name = TRUE;
unsigned i;
/* things we know to be objects/strings/routines */
static const char *decode_me_names[] = {
"n_to", "nw_to", "w_to", "sw_to", "s_to", "se_to", "e_to", "ne_to",
"in_to", "out_to", "u_to", "d_to",
"add_to_scope", "after", "article", "articles", "before", "cant_go",
"daemon", "describe", "door_dir", "door_to", "each_turn", "found_in",
"grammar", "initial", "inside_description", "invent", "life", "orders",
"parse_name", "plural", "react_after", "react_before",
"short_name", "short_name_indef", "time_out", "when_closed", "when_open",
"when_on", "when_off", "with_key",
"obj",
"description",
"ofclass"
};
/* things we know to be just plain numbers */
static const char *dont_decode_names[] = {
"capacity", "number", "time_left"
};
z_typed p;
const char *propname;
p.v = prop; p.t = Z_PROP;
propname = infix_get_name(p);
if(prop == 2)
propname = "ofclass";
infix_print_string(", ");
if(propname)
infix_print_string(propname);
else {
infix_print_string("P");
infix_print_number(prop);
}
infix_print_string(" =");
if(prop == 2) {
for(i = 0; i < prop_length; i+=ZWORD_SIZE) {
offset short_name_off = object_name(LOWORD(proptable + i));
if(short_name_off) {
infix_print_char(' ');
decodezscii(short_name_off, infix_print_char);
} else {
infix_print_string(" <badclass>");
}
}
return;
}
if(propname) {
if(n_strcmp(propname, "name") == 0) {
for(i = 0; i < prop_length; i+=ZWORD_SIZE) {
infix_print_string(" '");
decodezscii(LOWORD(proptable + i), infix_print_char);
infix_print_char('\'');
}
return;
}
for(i = 0; i < sizeof(decode_me_names) / sizeof(*decode_me_names); i++)
if(n_strcmp(decode_me_names[i], propname) == 0)
do_number = FALSE;
for(i = 0; i < sizeof(dont_decode_names) / sizeof(*dont_decode_names); i++)
if(n_strcmp(dont_decode_names[i], propname) == 0)
do_name = FALSE;
}
if(prop_length % ZWORD_SIZE || LOWORD(proptable) == 0) {
do_number = TRUE;
do_name = FALSE;
}
if(do_number) {
switch(prop_length) {
case 1:
infix_print_char(' ');
infix_print_znumber(LOBYTE(proptable));
break;
case ZWORD_SIZE:
infix_print_char(' ');
infix_print_znumber(LOWORD(proptable));
break;
default:
for(i = 0; i < prop_length; i++) {
infix_print_char(' ');
infix_print_znumber(LOBYTE(proptable + i));
}
}
}
if(do_name) {
for(i = 0; i < prop_length; i += ZWORD_SIZE) {
zword val = LOWORD(proptable + i);
const char *name = debug_decode_number(val);
if(name) {
infix_print_char(' ');
if(do_number)
infix_print_char('(');
infix_print_string(name);
if(do_number)
infix_print_char(')');
} else {
if(!do_number) {
infix_print_char(' ');
infix_print_znumber(val);
}
if(val <= object_count) {
offset short_name_off = object_name(val);
if(short_name_off) {
infix_print_char(' ');
infix_print_char('(');
decodezscii(short_name_off, infix_print_char);
infix_print_char(')');
}
}
}
}
}
}
static void infix_show_object(zword object)
{
const char *name;
if(!object) {
infix_print_string("0");
} else {
offset short_name_off;
z_typed o;
o.t = Z_OBJECT; o.v = object;
name = infix_get_name(o);
if(name) {
infix_print_string(name);
} else {
infix_print_number(object);
}
short_name_off = object_name(object);
if(short_name_off) {
infix_print_string(" \"");
decodezscii(short_name_off, infix_print_char);
infix_print_char('"');
} else if(!name) {
infix_print_string(" <nameless>");
}
}
}
zword infix_get_proptable(zword object, zword prop, zword *length)
{
zword propnum, location, nloc, nlen;
location = 0;
while(infix_property_loop(object, &propnum, &location, length, &nloc, &nlen)) {
if(propnum == prop)
return location;
}
return 0;
}
zword infix_get_prop(zword object, zword prop)
{
zword prop_length;
zword proptable = infix_get_proptable(object, prop, &prop_length);
if(!proptable) {
if(prop < PROP_NUM_MASK) { /* property defaults */
proptable = z_propdefaults + (prop - 1) * ZWORD_SIZE;
prop_length = ZWORD_SIZE;
} else {
return 0;
}
}
switch(prop_length) {
case 1:
return LOBYTE(proptable);
default:
case ZWORD_SIZE:
return LOWORD(proptable);
}
}
void infix_put_prop(zword object, zword prop, zword val)
{
zword prop_length;
zword proptable = infix_get_proptable(object, prop, &prop_length);
if(!proptable)
return;
switch(prop_length) {
case 1:
LOBYTEwrite(proptable, val);
default:
case ZWORD_SIZE:
LOWORDwrite(proptable, val);
}
}
BOOL infix_test_attrib(zword object, zword attrib)
{
if(!check_obj_valid(object) || !check_attr_valid(attrib)) {
return FALSE;
}
/* select the bit to be tested */
if(ATTRIBUTE(object, attrib) & (b10000000 >> (attrib & b0111)))
return TRUE;
else
return FALSE;
}
static char *trunk = NULL;
static int trunksize = 128;
static void infix_draw_trunk(int depth)
{
int i;
for(i = 1; i < depth; i++) {
if(trunk[i])
infix_print_fixed_string(" | ");
else
infix_print_fixed_string(" ");
}
}
static void infix_draw_branch(int depth)
{
infix_draw_trunk(depth);
if(depth)
infix_print_fixed_string(" +->");
}
static void infix_draw_object(zword object, int depth)
{
zword c;
unsigned width;
if(depth >= trunksize) {
trunksize *= 2;
trunk = (char *) n_realloc(trunk, trunksize);
}
infix_draw_branch(depth);
infix_show_object(object);
infix_print_char(10);
/* Do a sanity check before we print anything to avoid screenfulls of junk */
width = 0;
for(c = CHILD(object); c; c = SIBLING(c)) {
if(width++ > maxobjs) {
infix_print_string("looped sibling list.\n");
return;
}
}
for(c = CHILD(object); c; c = SIBLING(c)) {
if(PARENT(c) != object) { /* Section 12.5 (b) */
infix_print_string("object ");
infix_print_number(c);
infix_print_string(" is a child of object ");
infix_print_number(object);
infix_print_string(" but has ");
infix_print_number(PARENT(c));
infix_print_string(" listed as its parent.\n");
return;
}
trunk[depth+1] = (SIBLING(c) != 0);
infix_draw_object(c, depth+1);
}
}
void infix_object_tree(zword object)
{
trunk = (char *) n_malloc(trunksize);
if(object != 0) {
infix_draw_object(object, 0);
n_free(trunk);
return;
}
for(object = 1; object <= object_count; object++) {
if(!PARENT(object)) {
if(SIBLING(object)) { /* Section 12.5 (a) */
infix_print_string("Object ");
infix_print_number(object);
infix_print_string(" has no parent, but has sibling ");
infix_print_number(SIBLING(object));
infix_print_string(".\n");
return;
}
infix_draw_object(object, 0);