}/* z_print_char */
/*
* z_print_form, print a formatted table.
*
* zargs[0] = address of formatted table to be printed
*
*/
internal static void z_print_form()
{
zword count;
zword addr = Process.zargs[0];
bool first = true;
for (;;)
{
FastMem.LOW_WORD(addr, out count);
addr += 2;
if (count == 0)
{
break;
}
if (!first)
{
Buffer.new_line();
}
while (count-- > 0)
{
zbyte c;
FastMem.LOW_BYTE(addr, out c);
addr++;
Buffer.print_char(translate_from_zscii(c));
}
first = false;
}
}/* z_print_form */
}/* memory_open */
/*
* memory_new_line
*
* Redirect a newline to the memory of the Z-machine.
*
*/
internal static void memory_new_line()
{
zword size;
zword addr;
redirect[depth].total += redirect[depth].width;
redirect[depth].width = 0;
addr = redirect[depth].table;
FastMem.LOW_WORD(addr, out size);
addr += 2;
if (redirect[depth].xsize != 0xffff)
{
redirect[depth].table = (zword)(addr + size);
size = 0;
}
else
{
FastMem.storeb((zword)(addr + (size++)), 13);
}
FastMem.storew(redirect[depth].table, size);
}/* memory_new_line */
}/* z_print_num */
/*
* print_object
*
* Print an object description.
*
*/
internal static void print_object(zword object_var)
{
zword addr = CObject.object_name(object_var);
zword code = 0x94a5;
zbyte length;
FastMem.LOW_BYTE(addr, out length);
addr++;
if (length != 0)
{
FastMem.LOW_WORD(addr, out code);
}
if (code == 0x94a5) /* encoded text 0x94a5 == empty string */
{
print_string("object#"); /* supply a generic name */
print_num(object_var); /* for anonymous objects */
}
else
{
decode_text(string_type.LOW_STRING, addr);
}
}/* print_object */
internal static void z_make_menu()
{
/* This opcode was only used for the Macintosh version of Journey.
* It controls menus with numbers greater than 2 (menus 0, 1 and 2
* are system menus). */
if (Process.zargs[0] < 3)
{
Process.branch(false);
return;
}
if (Process.zargs[1] != 0)
{
zword items;
int i;
FastMem.LOW_WORD(Process.zargs[1], out items);
for (i = 0; i < items; i++)
{
zword item;
zbyte length;
zbyte c;
int j;
FastMem.LOW_WORD(Process.zargs[1] + 2 + (2 * i), out item);
FastMem.LOW_BYTE(item, out length);
if (length > 31)
{
length = 31;
}
menu[length] = 0;
for (j = 0; j < length; j++)
{
FastMem.LOW_BYTE(item + j + 1, out c);
menu[j] = Text.translate_from_zscii(c);
}
if (i == 0)
{
os_.menu(ZMachine.MENU_NEW, Process.zargs[0], menu);
}
else
{
os_.menu(ZMachine.MENU_ADD, Process.zargs[0], menu);
}
}
}
else
{
os_.menu(ZMachine.MENU_REMOVE, Process.zargs[0], new zword[0]);
}
Process.branch(true);
}/* z_make_menu */
}/* z_loadb */
/*
* z_loadw, store a value from a table of words.
*
* zargs[0] = address of table
* zargs[1] = index of table entry to store
*
*/
internal static void z_loadw()
{
zword addr = (zword)(Process.zargs[0] + 2 * Process.zargs[1]);
zword value;
FastMem.LOW_WORD(addr, out value);
Process.store(value);
}/* z_loadw */
/*
* translate_from_zscii
*
* Map a ZSCII character into Unicode.
*
*/
internal static zword translate_from_zscii(zbyte c)
{
if (c == 0xfc)
{
return(CharCodes.ZC_MENU_CLICK);
}
if (c == 0xfd)
{
return(CharCodes.ZC_DOUBLE_CLICK);
}
if (c == 0xfe)
{
return(CharCodes.ZC_SINGLE_CLICK);
}
if (c >= 0x9b && main.story_id != Story.BEYOND_ZORK)
{
if (main.hx_unicode_table != 0) /* game has its own Unicode table */
{
zbyte N;
FastMem.LOW_BYTE(main.hx_unicode_table, out N);
if (c - 0x9b < N)
{
zword addr = (zword)(main.hx_unicode_table + 1 + 2 * (c - 0x9b));
zword unicode;
FastMem.LOW_WORD(addr, out unicode);
if (unicode < 0x20)
{
return('?');
}
return(unicode);
}
else
{
return('?');
}
}
else /* game uses standard set */
if (c <= 0xdf)
{
return(zscii_to_latin1[c - 0x9b]);
}
else
{
return('?');
}
}
return((zword)c);
}/* translate_from_zscii */
}/* z_jin */
/*
* z_get_child, store the child of an object.
*
* Process.zargs[0] = object
*
*/
internal static void z_get_child()
{
zword obj_addr;
/* If we are monitoring object locating display a short note */
if (main.option_object_locating == true)
{
Stream.stream_mssg_on();
Text.print_string("@get_child ");
Text.print_object(Process.zargs[0]);
Stream.stream_mssg_off();
}
if (Process.zargs[0] == 0)
{
Err.runtime_error(ErrorCodes.ERR_GET_CHILD_0);
Process.store(0);
Process.branch(false);
return;
}
obj_addr = object_address(Process.zargs[0]);
if (main.h_version <= ZMachine.V3)
{
zbyte child;
/* Get child id from object */
obj_addr += O1_CHILD;
FastMem.LOW_BYTE(obj_addr, out child);
/* Store child id and branch */
Process.store(child);
Process.branch(child > 0);
}
else
{
zword child;
/* Get child id from object */
obj_addr += O4_CHILD;
FastMem.LOW_WORD(obj_addr, out child);
/* Store child id and branch */
Process.store(child);
Process.branch(child > 0);
}
}/* z_get_child */
}/* z_clear_attr */
/*
* z_jin, branch if the first object is inside the second.
*
* Process.zargs[0] = first object
* Process.zargs[1] = second object
*
*/
internal static void z_jin()
{
zword obj_addr;
/* If we are monitoring object locating display a short note */
if (main.option_object_locating == true)
{
Stream.stream_mssg_on();
Text.print_string("@jin ");
Text.print_object(Process.zargs[0]);
Text.print_string(" ");
Text.print_object(Process.zargs[1]);
Stream.stream_mssg_off();
}
if (Process.zargs[0] == 0)
{
Err.runtime_error(ErrorCodes.ERR_JIN_0);
Process.branch(0 == Process.zargs[1]);
return;
}
obj_addr = object_address(Process.zargs[0]);
if (main.h_version <= ZMachine.V3)
{
zbyte parent;
/* Get parent id from object */
obj_addr += O1_PARENT;
FastMem.LOW_BYTE(obj_addr, out parent);
/* Branch if the parent is obj2 */
Process.branch(parent == Process.zargs[1]);
}
else
{
zword parent;
/* Get parent id from object */
obj_addr += O4_PARENT;
FastMem.LOW_WORD(obj_addr, out parent);
/* Branch if the parent is obj2 */
Process.branch(parent == Process.zargs[1]);
}
}/* z_jin */
}/* z_loadw */
/*
* z_scan_table, find and store the address of a target within a table.
*
* zargs[0] = target value to be searched for
* zargs[1] = address of table
* zargs[2] = number of table entries to check value against
* zargs[3] = type of table (optional, defaults to 0x82)
*
* Note: The table is a word array if bit 7 of zargs[3] is set; otherwise
* it's a byte array. The lower bits hold the address step.
*
*/
internal static void z_scan_table()
{
zword addr = Process.zargs[1];
int i;
/* Supply default arguments */
if (Process.zargc < 4)
{
Process.zargs[3] = 0x82;
}
/* Scan byte or word array */
for (i = 0; i < Process.zargs[2]; i++)
{
if ((Process.zargs[3] & 0x80) > 0) /* scan word array */
{
zword wvalue;
FastMem.LOW_WORD(addr, out wvalue);
if (wvalue == Process.zargs[0])
{
goto finished;
}
}
else /* scan byte array */
{
zbyte bvalue;
FastMem.LOW_BYTE(addr, out bvalue);
if (bvalue == Process.zargs[0])
{
goto finished;
}
}
addr += (zword)(Process.zargs[3] & 0x7f);
}
addr = 0;
finished:
Process.store(addr);
Process.branch(addr > 0);
}/* z_scan_table */
}/* z_pop_stack */
/*
* z_pull, pop a value off...
*
* a) ...the game or a user stack and store it (V6)
*
* zargs[0] = address of user stack (optional)
*
* b) ...the game stack and write it to a variable (other than V6)
*
* zargs[0] = variable to write value to
*
*/
internal static void z_pull()
{
zword value;
if (main.h_version != ZMachine.V6) /* not a V6 game, pop stack and write */
{
value = main.stack[main.sp++];
if (Process.zargs[0] == 0)
{
main.stack[main.sp] = value;
}
else if (Process.zargs[0] < 16)
{
// *(fp - Process.zargs[0]) = value;
main.stack[main.fp - Process.zargs[0]] = value;
}
else
{
zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16));
FastMem.SET_WORD(addr, value);
}
}
else /* it's V6, but is there a user stack? */
{
if (Process.zargc == 1) /* it's a user stack */
{
zword size;
zword addr = Process.zargs[0];
FastMem.LOW_WORD(addr, out size);
size++;
FastMem.storew(addr, size);
addr += (zword)(2 * size);
FastMem.LOW_WORD(addr, out value);
}
else
{
value = main.stack[main.sp++]; // value = *sp++; /* it's the game stack */
}
Process.store(value);
}
}/* z_pull */
}/* z_push */
/*
* z_push_stack, push a value onto a user stack then branch if successful.
*
* zargs[0] = value to push onto the stack
* zargs[1] = address of user stack
*
*/
internal static void z_push_stack()
{
zword size;
zword addr = Process.zargs[1];
FastMem.LOW_WORD(addr, out size);
if (size != 0)
{
FastMem.storew((zword)(addr + 2 * size), Process.zargs[0]);
size--;
FastMem.storew(addr, size);
}
Process.branch(size > 0); // TODO I think that's what's expected here
}/* z_push_stack */
}/* translate_from_zscii */
/*
* unicode_to_zscii
*
* Convert a Unicode character to ZSCII, returning 0 on failure.
*
*/
internal static zbyte unicode_to_zscii(zword c)
{
int i;
if (c >= CharCodes.ZC_LATIN1_MIN)
{
if (main.hx_unicode_table != 0) /* game has its own Unicode table */
{
zbyte N;
FastMem.LOW_BYTE(main.hx_unicode_table, out N);
for (i = 0x9b; i < 0x9b + N; i++)
{
zword addr = (zword)(main.hx_unicode_table + 1 + 2 * (i - 0x9b));
zword unicode;
FastMem.LOW_WORD(addr, out unicode);
if (c == unicode)
{
return((zbyte)i);
}
}
return(0);
}
else /* game uses standard set */
{
for (i = 0x9b; i <= 0xdf; i++)
{
if (c == zscii_to_latin1[i - 0x9b])
{
return((zbyte)i);
}
}
return(0);
}
}
return((zbyte)c);
}/* unicode_to_zscii */
}/* z_pop */
/*
* z_pop_stack, pop n values off the game or user stack and discard them.
*
* zargs[0] = number of values to discard
* zargs[1] = address of user stack (optional)
*
*/
internal static void z_pop_stack()
{
if (Process.zargc == 2) /* it's a user stack */
{
zword size;
zword addr = Process.zargs[1];
FastMem.LOW_WORD(addr, out size);
size += Process.zargs[0];
FastMem.storew(addr, size);
}
else
{
main.sp += Process.zargs[0]; /* it's the game stack */
}
}/* z_pop_stack */
}/* z_get_prop_len */
/*
* z_get_sibling, store the sibling of an object.
*
* Process.zargs[0] = object
*
*/
internal static void z_get_sibling()
{
zword obj_addr;
if (Process.zargs[0] == 0)
{
Err.runtime_error(ErrorCodes.ERR_GET_SIBLING_0);
Process.store(0);
Process.branch(false);
return;
}
obj_addr = object_address(Process.zargs[0]);
if (main.h_version <= ZMachine.V3)
{
zbyte sibling;
/* Get sibling id from object */
obj_addr += O1_SIBLING;
FastMem.LOW_BYTE(obj_addr, out sibling);
/* Store sibling and branch */
Process.store(sibling);
Process.branch(sibling > 0); // TODO I'm not sure about this logic Process.branch (sibling);
// I think it means if the sibling isn't zero, jump..
}
else
{
zword sibling;
/* Get sibling id from object */
obj_addr += O4_SIBLING;
FastMem.LOW_WORD(obj_addr, out sibling);
/* Store sibling and branch */
Process.store(sibling);
Process.branch(sibling > 0);
}
}/* z_get_sibling */
}/* z_dec_chk */
/*
* z_inc, increment a variable.
*
* zargs[0] = variable to increment
*
*/
internal static void z_inc()
{
zword value;
if (Process.zargs[0] == 0)
{
main.stack[main.sp]++; // (*sp)++;
}
else if (Process.zargs[0] < 16)
{
(main.stack[main.fp - Process.zargs[0]])++;
}
else
{
zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16));
FastMem.LOW_WORD(addr, out value);
value++;
FastMem.SET_WORD(addr, value);
}
}/* z_inc */
}/* z_inc_chk */
/*
* z_load, store the value of a variable.
*
* zargs[0] = variable to store
*
*/
internal static void z_load()
{
zword value;
if (Process.zargs[0] == 0)
{
value = main.stack[main.sp];
}
else if (Process.zargs[0] < 16)
{
value = main.stack[main.fp - Process.zargs[0]];
}
else
{
zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16));
FastMem.LOW_WORD(addr, out value);
}
Process.store(value);
}/* z_load */
}/* memory_new_line */
/*
* memory_word
*
* Redirect a string of characters to the memory of the Z-machine.
*
*/
internal static void memory_word(zword[] s)
{
zword size;
zword addr;
zword c;
int pos = 0;
if (main.h_version == ZMachine.V6)
{
int width = os_.string_width(s);
if (redirect[depth].xsize != 0xffff)
{
if (redirect[depth].width + width > redirect[depth].xsize)
{
if (s[pos] == ' ' || s[pos] == CharCodes.ZC_INDENT || s[pos] == CharCodes.ZC_GAP)
{
width = os_.string_width(s, ++pos);
}
memory_new_line();
}
}
redirect[depth].width += (zword)width;
}
addr = redirect[depth].table;
FastMem.LOW_WORD(addr, out size);
addr += 2;
while ((c = s[pos++]) != 0)
{
FastMem.storeb((zword)(addr + (size++)), Text.translate_to_zscii(c));
}
FastMem.storew(redirect[depth].table, size);
}/* memory_word */
}/* z_dec */
/*
* z_dec_chk, decrement a variable and branch if now less than value.
*
* zargs[0] = variable to decrement
* zargs[1] = value to check variable against
*
*/
internal static void z_dec_chk()
{
zword value;
if (Process.zargs[0] == 0)
{
value = --(main.stack[main.sp]);
}
else if (Process.zargs[0] < 16)
{
value = --(main.stack[main.fp - Process.zargs[0]]);
}
else
{
zword addr = (zword)(main.h_globals + 2 * (Process.zargs[0] - 16));
FastMem.LOW_WORD(addr, out value);
value--;
FastMem.SET_WORD(addr, value);
}
Process.branch((short)value < (short)Process.zargs[1]);
}/* z_dec_chk */
/*
* load_operand
*
* Load an operand, either a variable or a constant.
*
*/
static void load_operand(zbyte type)
{
zword value;
if ((type & 2) > 0)
{ /* variable */
zbyte variable;
FastMem.CODE_BYTE(out variable);
if (variable == 0)
{
value = main.stack[main.sp++];
}
else if (variable < 16)
{
value = main.stack[main.fp - variable];
}
else
{
zword addr = (zword)(main.h_globals + 2 * (variable - 16)); // TODO Make sure this logic
FastMem.LOW_WORD(addr, out value);
}
}
else if ((type & 1) > 0)
{ /* small constant */
zbyte bvalue;
FastMem.CODE_BYTE(out bvalue);
value = bvalue;
}
else
{
FastMem.CODE_WORD(out value); /* large constant */
}
zargs[zargc++] = value;
DebugState.Output(" Storing operand: {0} -> {1}", zargc - 1, value);
}/* load_operand */
}/* object_address */
/*
* object_name
*
* Return the address of the given object's name.
*
*/
internal static zword object_name(zword object_var)
{
zword obj_addr;
zword name_addr;
obj_addr = object_address(object_var);
/* The object name address is found at the start of the properties */
if (main.h_version <= ZMachine.V3)
{
obj_addr += O1_PROPERTY_OFFSET;
}
else
{
obj_addr += O4_PROPERTY_OFFSET;
}
FastMem.LOW_WORD(obj_addr, out name_addr);
return(name_addr);
}/* object_name */
static void decode_text(string_type st, zword addr)
{
// zword* ptr;
long byte_addr;
zword c2;
zword code;
zbyte c, prev_c = 0;
int shift_state = 0;
int shift_lock = 0;
int status = 0;
// ptr = NULL; /* makes compilers shut up */
byte_addr = 0;
if (resolution == 0)
{
find_resolution();
}
/* Calculate the byte address if necessary */
if (st == string_type.ABBREVIATION)
{
byte_addr = (long)addr << 1;
}
else if (st == string_type.HIGH_STRING)
{
if (main.h_version <= ZMachine.V3)
{
byte_addr = (long)addr << 1;
}
else if (main.h_version <= ZMachine.V5)
{
byte_addr = (long)addr << 2;
}
else if (main.h_version <= ZMachine.V7)
{
byte_addr = ((long)addr << 2) + ((long)main.h_strings_offset << 3);
}
else /* (h_version <= V8) */
{
byte_addr = (long)addr << 3;
}
if (byte_addr >= main.story_size)
{
Err.runtime_error(ErrorCodes.ERR_ILL_PRINT_ADDR);
}
}
/* Loop until a 16bit word has the highest bit set */
if (st == string_type.VOCABULARY)
{
ptrDt = 0;
}
do
{
int i;
/* Fetch the next 16bit word */
if (st == string_type.LOW_STRING || st == string_type.VOCABULARY)
{
FastMem.LOW_WORD(addr, out code);
addr += 2;
}
else if (st == string_type.HIGH_STRING || st == string_type.ABBREVIATION)
{
FastMem.HIGH_WORD(byte_addr, out code);
byte_addr += 2;
}
else
{
FastMem.CODE_WORD(out code);
}
/* Read its three Z-characters */
for (i = 10; i >= 0; i -= 5)
{
zword abbr_addr;
zword ptr_addr;
zword zc;
c = (zbyte)((code >> i) & 0x1f);
switch (status)
{
case 0: /* normal operation */
if (shift_state == 2 && c == 6)
{
status = 2;
}
else if (main.h_version == ZMachine.V1 && c == 1)
{
Buffer.new_line();
}
else if (main.h_version >= ZMachine.V2 && shift_state == 2 && c == 7)
{
Buffer.new_line();
}
else if (c >= 6)
{
outchar(st, alphabet(shift_state, c - 6));
}
else if (c == 0)
{
outchar(st, ' ');
}
else if (main.h_version >= ZMachine.V2 && c == 1)
{
status = 1;
}
else if (main.h_version >= ZMachine.V3 && c <= 3)
{
status = 1;
}
else
{
shift_state = (shift_lock + (c & 1) + 1) % 3;
if (main.h_version <= ZMachine.V2 && c >= 4)
{
shift_lock = shift_state;
}
break;
}
shift_state = shift_lock;
break;
case 1: /* abbreviation */
ptr_addr = (zword)(main.h_abbreviations + 64 * (prev_c - 1) + 2 * c);
FastMem.LOW_WORD(ptr_addr, out abbr_addr);
decode_text(string_type.ABBREVIATION, abbr_addr);
status = 0;
break;
case 2: /* ZSCII character - first part */
status = 3;
break;
case 3: /* ZSCII character - second part */
zc = (zword)((prev_c << 5) | c);
c2 = translate_from_zscii((zbyte)zc); // TODO This doesn't seem right
outchar(st, c2);
status = 0;
break;
}
prev_c = c;
}
} while (!((code & 0x8000) > 0));
if (st == string_type.VOCABULARY)
{
ptrDt = 0;
}
}/* decode_text */
}/* z_print_unicode */
/*
* lookup_text
*
* Scan a dictionary searching for the given word. The first argument
* can be
*
* 0x00 - find the first word which is >= the given one
* 0x05 - find the word which exactly matches the given one
* 0x1f - find the last word which is <= the given one
*
* The return value is 0 if the search fails.
*
*/
internal static zword lookup_text(int padding, zword dct)
{
zword entry_addr;
zword entry_count;
zword entry;
zword addr;
zbyte entry_len;
zbyte sep_count;
int entry_number;
int lower, upper;
int i;
bool sorted;
if (resolution == 0)
{
find_resolution();
}
Text.encode_text(padding);
FastMem.LOW_BYTE(dct, out sep_count); /* skip word separators */
dct += (zword)(1 + sep_count);
FastMem.LOW_BYTE(dct, out entry_len); /* get length of entries */
dct += 1;
FastMem.LOW_WORD(dct, out entry_count); /* get number of entries */
dct += 2;
if ((short)entry_count < 0) /* bad luck, entries aren't sorted */
{
entry_count = (zword)(-(short)entry_count);
sorted = false;
}
else
{
sorted = true; /* entries are sorted */
}
lower = 0;
upper = entry_count - 1;
while (lower <= upper)
{
if (sorted) /* binary search */
{
entry_number = (lower + upper) / 2;
}
else /* linear search */
{
entry_number = lower;
}
entry_addr = (zword)(dct + entry_number * entry_len);
/* Compare word to dictionary entry */
addr = entry_addr;
for (i = 0; i < resolution; i++)
{
FastMem.LOW_WORD(addr, out entry);
if (encoded[i] != entry)
{
goto continuing;
}
addr += 2;
}
return(entry_addr); /* exact match found, return now */
continuing:
if (sorted) /* binary search */
{
if (encoded[i] > entry)
{
lower = entry_number + 1;
}
else
{
upper = entry_number - 1;
}
}
else
{
lower++; /* linear search */
}
}
/* No exact match has been found */
if (padding == 0x05)
{
return(0);
}
entry_number = (padding == 0x00) ? lower : upper;
if (entry_number == -1 || entry_number == entry_count)
{
return(0);
}
return((zword)(dct + entry_number * entry_len));
}/* lookup_text */
}/* next_property */
/*
* unlink_object
*
* Unlink an object from its parent and siblings.
*
*/
static void unlink_object(zword object_var)
{
zword obj_addr;
zword parent_addr;
zword sibling_addr;
if (object_var == 0)
{
Err.runtime_error(ErrorCodes.ERR_REMOVE_OBJECT_0);
return;
}
obj_addr = object_address(object_var);
if (main.h_version <= ZMachine.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;
FastMem.LOW_BYTE(obj_addr, out parent);
if (parent == 0)
{
return;
}
/* Get (older) sibling of object and set both parent and sibling
* pointers to 0 */
FastMem.SET_BYTE(obj_addr, zero);
obj_addr += (zword)(O1_SIBLING - O1_PARENT);
FastMem.LOW_BYTE(obj_addr, out older_sibling);
FastMem.SET_BYTE(obj_addr, zero);
/* Get first child of parent (the youngest sibling of the object) */
parent_addr = (zword)(object_address(parent) + O1_CHILD);
FastMem.LOW_BYTE(parent_addr, out younger_sibling);
/* Remove object from the list of siblings */
if (younger_sibling == object_var)
{
FastMem.SET_BYTE(parent_addr, older_sibling);
}
else
{
do
{
sibling_addr = (zword)(object_address(younger_sibling) + O1_SIBLING);
FastMem.LOW_BYTE(sibling_addr, out younger_sibling);
} while (younger_sibling != object_var);
FastMem.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;
FastMem.LOW_WORD(obj_addr, out parent);
if (parent == 0)
{
return;
}
/* Get (older) sibling of object and set both parent and sibling
* pointers to 0 */
FastMem.SET_WORD(obj_addr, zero);
obj_addr += (zword)(O4_SIBLING - O4_PARENT);
FastMem.LOW_WORD(obj_addr, out older_sibling);
FastMem.SET_WORD(obj_addr, zero);
/* Get first child of parent (the youngest sibling of the object) */
parent_addr = (zword)(object_address(parent) + O4_CHILD);
FastMem.LOW_WORD(parent_addr, out younger_sibling);
/* Remove object from the list of siblings */
if (younger_sibling == object_var)
{
FastMem.SET_WORD(parent_addr, older_sibling);
}
else
{
do
{
sibling_addr = (zword)(object_address(younger_sibling) + O4_SIBLING);
FastMem.LOW_WORD(sibling_addr, out younger_sibling);
} while (younger_sibling != object_var);
FastMem.SET_WORD(sibling_addr, older_sibling);
}
}
}/* unlink_object */
}/* z_get_parent */
/*
* z_get_prop, store the value of an object property.
*
* Process.zargs[0] = object
* Process.zargs[1] = number of property to be examined
*
*/
internal static void z_get_prop()
{
zword prop_addr;
zword wprop_val;
zbyte bprop_val;
zbyte value;
zbyte mask;
if (Process.zargs[0] == 0)
{
Err.runtime_error(ErrorCodes.ERR_GET_PROP_0);
Process.store(0);
return;
}
/* Property id is in bottom five (six) bits */
mask = (zbyte)((main.h_version <= ZMachine.V3) ? 0x1f : 0x3f);
/* Load address of first property */
prop_addr = first_property(Process.zargs[0]);
/* Scan down the property list */
for (; ;)
{
FastMem.LOW_BYTE(prop_addr, out value);
if ((value & mask) <= Process.zargs[1])
{
break;
}
prop_addr = next_property(prop_addr);
}
if ((value & mask) == Process.zargs[1]) /* property found */
/* Load property (byte or word sized) */
{
prop_addr++;
if ((main.h_version <= ZMachine.V3 && !((value & 0xe0) > 0)) || (main.h_version >= ZMachine.V4 && !((value & 0xc0) > 0)))
{
FastMem.LOW_BYTE(prop_addr, out bprop_val);
wprop_val = bprop_val;
}
else
{
FastMem.LOW_WORD(prop_addr, out wprop_val);
}
}
else /* property not found */
/* Load default value */
{
prop_addr = (zword)(main.h_objects + 2 * (Process.zargs[1] - 1));
FastMem.LOW_WORD(prop_addr, out wprop_val);
}
/* Store the property value */
Process.store(wprop_val);
}/* z_get_prop */
}/* z_get_sibling */
/*
* z_insert_obj, make an object the first child of another object.
*
* Process.zargs[0] = object to be moved
* Process.zargs[1] = destination object
*
*/
internal static void z_insert_obj()
{
zword obj1 = Process.zargs[0];
zword obj2 = Process.zargs[1];
zword obj1_addr;
zword obj2_addr;
/* If we are monitoring object movements display a short note */
if (main.option_object_movement == true)
{
Stream.stream_mssg_on();
Text.print_string("@move_obj ");
Text.print_object(obj1);
Text.print_string(" ");
Text.print_object(obj2);
Stream.stream_mssg_off();
}
if (obj1 == 0)
{
Err.runtime_error(ErrorCodes.ERR_MOVE_OBJECT_0);
return;
}
if (obj2 == 0)
{
Err.runtime_error(ErrorCodes.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 (main.h_version <= ZMachine.V3)
{
zbyte child;
obj1_addr += O1_PARENT;
FastMem.SET_BYTE(obj1_addr, (zbyte)obj2);
obj2_addr += O1_CHILD;
FastMem.LOW_BYTE(obj2_addr, out child);
FastMem.SET_BYTE(obj2_addr, (zbyte)obj1);
obj1_addr += (zword)(O1_SIBLING - O1_PARENT);
FastMem.SET_BYTE(obj1_addr, child);
}
else
{
zword child;
obj1_addr += O4_PARENT;
FastMem.SET_WORD(obj1_addr, obj2);
obj2_addr += O4_CHILD;
FastMem.LOW_WORD(obj2_addr, out child);
FastMem.SET_WORD(obj2_addr, obj1);
obj1_addr += (zword)(O4_SIBLING - O4_PARENT);
FastMem.SET_WORD(obj1_addr, child);
}
}/* z_insert_obj */
