}/* first_property */
/*
* next_property
*
* Calculate the address of the next property in a property list.
*
*/
private static zword NextProperty(zword prop_addr)
{
/* Load the current property id */
FastMem.LowByte(prop_addr, out zbyte value);
prop_addr++;
/* Calculate the length of this property */
if (Main.h_version <= ZMachine.V3)
{
value >>= 5;
}
else if (!((value & 0x80) > 0))
{
value >>= 6;
}
else
{
FastMem.LowByte(prop_addr, out value);
value &= 0x3f;
if (value == 0)
{
value = 64; /* demanded by Spec 1.0 */
}
}
/* Add property length to current property pointer */
return((zword)(prop_addr + value + 1));
}/* next_property */
}/* 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 ZInsertObj()
{
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.StreamMssgOn();
Text.PrintString("@move_obj ");
Text.PrintObject(obj1);
Text.PrintString(" ");
Text.PrintObject(obj2);
Stream.StreamMssgOff();
}
if (obj1 == 0)
{
Err.RuntimeError(ErrorCodes.ERR_MOVE_OBJECT_0);
return;
}
if (obj2 == 0)
{
Err.RuntimeError(ErrorCodes.ERR_MOVE_OBJECT_TO_0);
return;
}
/* Get addresses of both objects */
obj1_addr = ObjectAddress(obj1);
obj2_addr = ObjectAddress(obj2);
/* Remove object 1 from current parent */
UnlinkObject(obj1);
/* Make object 1 first child of object 2 */
if (Main.h_version <= ZMachine.V3)
{
obj1_addr += O1_PARENT;
FastMem.SetByte(obj1_addr, (zbyte)obj2);
obj2_addr += O1_CHILD;
FastMem.LowByte(obj2_addr, out byte child);
FastMem.SetByte(obj2_addr, (zbyte)obj1);
obj1_addr += (zword)(O1_SIBLING - O1_PARENT);
FastMem.SetByte(obj1_addr, child);
}
else
{
obj1_addr += O4_PARENT;
FastMem.SetWord(obj1_addr, obj2);
obj2_addr += O4_CHILD;
FastMem.LowWord(obj2_addr, out ushort child);
FastMem.SetWord(obj2_addr, obj1);
obj1_addr += (zword)(O4_SIBLING - O4_PARENT);
FastMem.SetWord(obj1_addr, child);
}
}/* z_insert_obj */
} /* z_copy_table */
/*
* z_loadb, store a value from a table of bytes.
*
* zargs[0] = address of table
* zargs[1] = index of table entry to store
*
*/
internal static void ZLoadB()
{
zword addr = (zword)(Process.zargs[0] + Process.zargs[1]);
FastMem.LowByte(addr, out byte value);
Process.Store(value);
} /* z_loadb */
}/* find_resolution */
/*
* load_string
*
* Copy a ZSCII string from the memory to the global "decoded" string.
*
*/
internal static void LoadString(zword addr, zword length)
{
if (Decoded is null)
{
ThrowHelper.ThrowInvalidOperationException("Decoded not initialized");
}
int i = 0;
if (Resolution == 0)
{
FindResolution();
}
while (i < 3 * Resolution)
{
if (i < length)
{
FastMem.LowByte(addr, out zbyte c);
addr++;
Decoded[i++] = Text.TranslateFromZscii(c);
}
else
{
Decoded[i++] = 0;
}
}
}/* load_string */
}/* z_get_prop_addr */
/*
* z_get_prop_len, store the length of an object property.
*
* Process.zargs[0] = address of property to be examined
*
*/
internal static void ZGetPropLen()
{
zword addr;
/* Back up the property pointer to the property id */
addr = (zword)(Process.zargs[0] - 1);
FastMem.LowByte(addr, out byte value);
/* Calculate length of property */
if (Main.h_version <= ZMachine.V3)
{
value = (zbyte)((value >> 5) + 1);
}
else if (!((value & 0x80) > 0))
{
value = (zbyte)((value >> 6) + 1);
}
else
{
value &= 0x3f;
if (value == 0)
{
value = 64; /* demanded by Spec 1.0 */
}
}
/* Store length of property */
Process.Store(value);
}/* z_get_prop_len */
/*
* z_copy_table, copy a table or fill it with zeroes.
*
* zargs[0] = address of table
* zargs[1] = destination address or 0 for fill
* zargs[2] = size of table
*
* Note: Copying is safe even when source and destination overlap; but
* if zargs[1] is negative the table _must_ be copied forwards.
*
*/
internal static void ZCopyTable()
{
zword addr;
zword size = Process.zargs[2];
zbyte value;
int i;
if (Process.zargs[1] == 0) /* zero table */
{
for (i = 0; i < size; i++)
{
FastMem.StoreB((zword)(Process.zargs[0] + i), 0);
}
}
else if ((short)size < 0 || Process.zargs[0] > Process.zargs[1]) /* copy forwards */
{
for (i = 0; i < (((short)size < 0) ? -(short)size : size); i++)
{
addr = (zword)(Process.zargs[0] + i);
FastMem.LowByte(addr, out value);
FastMem.StoreB((zword)(Process.zargs[1] + i), value);
}
}
else /* copy backwards */
{
for (i = size - 1; i >= 0; i--)
{
addr = (zword)(Process.zargs[0] + i);
FastMem.LowByte(addr, out value);
FastMem.StoreB((zword)(Process.zargs[1] + i), value);
}
}
} /* z_copy_table */
}/* translate_to_zscii */
/*
* alphabet
*
* Return a character from one of the three character sets.
*
*/
private static zword Alphabet(int set, int index)
{
if (Main.h_version > ZMachine.V1 && set == 2 && index == 1)
{
return(0x0D); /* always newline */
}
if (Main.h_alphabet != 0)
{ /* game uses its own alphabet */
zword addr = (zword)(Main.h_alphabet + 26 * set + index);
FastMem.LowByte(addr, out zbyte c);
return(TranslateFromZscii(c));
}
else /* game uses default alphabet */
if (set == 0)
{
return((zword)('a' + index));
}
else if (set == 1)
{
return((zword)('A' + index));
}
else if (Main.h_version == ZMachine.V1)
{
return(_alphabet[index]);
}
else
{
return(_alphabet[index]);
}
}/* alphabet */
}/* 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 ZGetProp()
{
zword prop_addr;
zword wprop_val;
zbyte value;
zbyte mask;
if (Process.zargs[0] == 0)
{
Err.RuntimeError(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 = FirstProperty(Process.zargs[0]);
/* Scan down the property list */
for (; ;)
{
FastMem.LowByte(prop_addr, out value);
if ((value & mask) <= Process.zargs[1])
{
break;
}
prop_addr = NextProperty(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.LowByte(prop_addr, out zbyte bprop_val);
wprop_val = bprop_val;
}
else
{
FastMem.LowWord(prop_addr, out wprop_val);
}
}
else
{ /* property not found */
/* Load default value */
prop_addr = (zword)(Main.h_objects + 2 * (Process.zargs[1] - 1));
FastMem.LowWord(prop_addr, out wprop_val);
}
/* Store the property value */
Process.Store(wprop_val);
}/* z_get_prop */
}/* z_get_prop */
/*
* z_get_prop_addr, store the address of an object property.
*
* Process.zargs[0] = object
* Process.zargs[1] = number of property to be examined
*
*/
internal static void ZGetPropAddr()
{
zword prop_addr;
zbyte value;
zbyte mask;
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_GET_PROP_ADDR_0);
Process.Store(0);
return;
}
if (Main.StoryId == Story.BEYOND_ZORK && Process.zargs[0] > MAX_OBJECT)
{
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 = FirstProperty(Process.zargs[0]);
/* Scan down the property list */
for (; ;)
{
FastMem.LowByte(prop_addr, out value);
if ((value & mask) <= Process.zargs[1])
{
break;
}
prop_addr = NextProperty(prop_addr);
}
/* Calculate the property address or return zero */
if ((value & mask) == Process.zargs[1])
{
if (Main.h_version >= ZMachine.V4 && (value & 0x80) > 0)
{
prop_addr++;
}
Process.Store((zword)(prop_addr + 1));
}
else
{
Process.Store(0);
}
}/* z_get_prop_addr */
/*
* translate_from_zscii
*
* Map a ZSCII character into Unicode.
*
*/
internal static zword TranslateFromZscii(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.StoryId != Story.BEYOND_ZORK)
{
if (Main.hx_unicode_table != 0)
{ /* game has its own Unicode table */
FastMem.LowByte(Main.hx_unicode_table, out zbyte N);
if (c - 0x9b < N)
{
zword addr = (zword)(Main.hx_unicode_table + 1 + 2 * (c - 0x9b));
FastMem.LowWord(addr, out zword unicode);
if (unicode < 0x20)
{
return('?');
}
return(unicode);
}
else
{
return('?');
}
}
else if (c <= 0xdf) /* game uses standard set */
{
return(zscii_to_latin1[c - 0x9b]);
}
else
{
return('?');
}
}
return(c);
}/* translate_from_zscii */
}/* z_insert_obj */
/*
* z_put_prop, set the value of an object property.
*
* Process.zargs[0] = object
* Process.zargs[1] = number of property to set
* Process.zargs[2] = value to set property to
*
*/
internal static void ZPutProp()
{
zword prop_addr;
zbyte value;
zbyte mask;
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_PUT_PROP_0);
return;
}
/* Property id is in bottom five or six bits */
mask = (zbyte)((Main.h_version <= ZMachine.V3) ? 0x1f : 0x3f);
/* Load address of first property */
prop_addr = FirstProperty(Process.zargs[0]);
/* Scan down the property list */
for (; ;)
{
FastMem.LowByte(prop_addr, out value);
if ((value & mask) <= Process.zargs[1])
{
break;
}
prop_addr = NextProperty(prop_addr);
}
/* Exit if the property does not exist */
if ((value & mask) != Process.zargs[1])
{
Err.RuntimeError(ErrorCodes.ERR_NO_PROP);
}
/* Store the new property value (byte or word sized) */
prop_addr++;
if ((Main.h_version <= ZMachine.V3 && !((value & 0xe0) > 0)) || (Main.h_version >= ZMachine.V4 && !((value & 0xc0) > 0)))
{
zbyte v = (zbyte)Process.zargs[2];
FastMem.SetByte(prop_addr, v);
}
else
{
zword v = Process.zargs[2];
FastMem.SetWord(prop_addr, v);
}
}/* z_put_prop */
}/* object_name */
/*
* first_property
*
* Calculate the start address of the property list associated with
* an object.
*
*/
private static zword FirstProperty(zword obj)
{
/* Fetch address of object name */
zword prop_addr = ObjectName(obj);
/* Get length of object name */
FastMem.LowByte(prop_addr, out zbyte size);
/* Add name length to pointer */
return((zword)(prop_addr + 1 + 2 * size));
}/* first_property */
internal static void ZMakeMenu()
{
/* 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)
{
FastMem.LowWord(Process.zargs[1], out zword items);
for (int i = 0; i < items; i++)
{
FastMem.LowWord(Process.zargs[1] + 2 + (2 * i), out zword item);
FastMem.LowByte(item, out zbyte length);
if (length > 31)
{
length = 31;
}
menu[length] = 0;
for (int j = 0; j < length; j++)
{
FastMem.LowByte(item + j + 1, out zbyte c);
menu[j] = Text.TranslateFromZscii(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], Array.Empty <zword>());
}
Process.Branch(true);
}/* z_make_menu */
}/* 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 ZJin()
{
zword obj_addr;
/* If we are monitoring object locating display a short note */
if (Main.option_object_locating)
{
Stream.StreamMssgOn();
Text.PrintString("@jin ");
Text.PrintObject(Process.zargs[0]);
Text.PrintString(" ");
Text.PrintObject(Process.zargs[1]);
Stream.StreamMssgOff();
}
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_JIN_0);
Process.Branch(0 == Process.zargs[1]);
return;
}
obj_addr = ObjectAddress(Process.zargs[0]);
if (Main.h_version <= ZMachine.V3)
{
/* Get parent id from object */
obj_addr += O1_PARENT;
FastMem.LowByte(obj_addr, out zbyte parent);
/* Branch if the parent is obj2 */
Process.Branch(parent == Process.zargs[1]);
}
else
{
/* Get parent id from object */
obj_addr += O4_PARENT;
FastMem.LowWord(obj_addr, out zword parent);
/* Branch if the parent is obj2 */
Process.Branch(parent == Process.zargs[1]);
}
}/* z_jin */
}/* z_remove_obj */
/*
* z_set_attr, set an object attribute.
*
* Process.zargs[0] = object
* Process.zargs[1] = number of attribute to set
*
*/
internal static void ZSetAttr()
{
zword obj_addr;
if (Main.StoryId == Story.SHERLOCK)
{
if (Process.zargs[1] == 48)
{
return;
}
}
if (Process.zargs[1] > ((Main.h_version <= ZMachine.V3) ? 31 : 47))
{
Err.RuntimeError(ErrorCodes.ERR_ILL_ATTR);
}
/* If we are monitoring attribute assignment display a short note */
if (Main.option_attribute_assignment == true)
{
Stream.StreamMssgOn();
Text.PrintString("@set_attr ");
Text.PrintObject(Process.zargs[0]);
Text.PrintString(" ");
Text.PrintNum(Process.zargs[1]);
Stream.StreamMssgOff();
}
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_SET_ATTR_0);
return;
}
/* Get attribute address */
obj_addr = (zword)(ObjectAddress(Process.zargs[0]) + Process.zargs[1] / 8);
/* Load attribute byte */
FastMem.LowByte(obj_addr, out zbyte value);
/* Set attribute bit */
value |= (zbyte)(0x80 >> (Process.zargs[1] & 7));
/* Store attribute byte */
FastMem.SetByte(obj_addr, value);
}/* z_set_attr */
}/* z_get_next_prop */
/*
* z_get_parent, store the parent of an object.
*
* Process.zargs[0] = object
*
*/
internal static void ZGetParent()
{
zword obj_addr;
/* If we are monitoring object locating display a short note */
if (Main.option_object_locating)
{
Stream.StreamMssgOn();
Text.PrintString("@get_parent ");
Text.PrintObject(Process.zargs[0]);
Stream.StreamMssgOff();
}
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_GET_PARENT_0);
Process.Store(0);
return;
}
obj_addr = ObjectAddress(Process.zargs[0]);
if (Main.h_version <= ZMachine.V3)
{
/* Get parent id from object */
obj_addr += O1_PARENT;
FastMem.LowByte(obj_addr, out zbyte parent);
/* Store parent */
Process.Store(parent);
}
else
{
/* Get parent id from object */
obj_addr += O4_PARENT;
FastMem.LowWord(obj_addr, out zword parent);
/* Store parent */
Process.Store(parent);
}
}/* z_get_parent */
}/* z_jin */
/*
* z_get_child, store the child of an object.
*
* Process.zargs[0] = object
*
*/
internal static void ZGetChild()
{
zword obj_addr;
/* If we are monitoring object locating display a short note */
if (Main.option_object_locating)
{
Stream.StreamMssgOn();
Text.PrintString("@get_child ");
Text.PrintObject(Process.zargs[0]);
Stream.StreamMssgOff();
}
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_GET_CHILD_0);
Process.Store(0);
Process.Branch(false);
return;
}
obj_addr = ObjectAddress(Process.zargs[0]);
if (Main.h_version <= ZMachine.V3)
{
/* Get child id from object */
obj_addr += O1_CHILD;
FastMem.LowByte(obj_addr, out zbyte child);
/* Store child id and branch */
Process.Store(child);
Process.Branch(child > 0);
}
else
{
/* Get child id from object */
obj_addr += O4_CHILD;
FastMem.LowWord(obj_addr, out zword child);
/* Store child id and branch */
Process.Store(child);
Process.Branch(child > 0);
}
}/* z_get_child */
}/* alphabet */
/*
* find_resolution
*
* Find the number of bytes used for dictionary resolution.
*
*/
internal static void FindResolution()
{
zword dct = Main.h_dictionary;
FastMem.LowByte(dct, out zbyte sep_count);
dct += (zword)(1 + sep_count); /* skip word separators */
FastMem.LowByte(dct, out zbyte entry_len);
Resolution = (Main.h_version <= ZMachine.V3) ? 2 : 3;
if (2 * Resolution > entry_len)
{
Err.RuntimeError(ErrorCodes.ERR_DICT_LEN);
}
Decoded = new zword[3 * Resolution + 1];
Encoded = new zword[Resolution];
}/* find_resolution */
} /* 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 ZScanTable()
{
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 */
FastMem.LowWord(addr, out ushort wvalue);
if (wvalue == Process.zargs[0])
{
goto finished;
}
}
else
{ /* scan byte array */
FastMem.LowByte(addr, out byte 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_get_child */
/*
* z_get_next_prop, store the number of the first or next property.
*
* Process.zargs[0] = object
* Process.zargs[1] = address of current property (0 gets the first property)
*
*/
internal static void ZGetNextProp()
{
zbyte value;
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_GET_NEXT_PROP_0);
Process.Store(0);
return;
}
/* Property id is in bottom five (six) bits */
zbyte mask = (zbyte)((Main.h_version <= ZMachine.V3) ? 0x1f : 0x3f);
/* Load address of first property */
zword prop_addr = FirstProperty(Process.zargs[0]);
if (Process.zargs[1] != 0)
{
/* Scan down the property list */
do
{
FastMem.LowByte(prop_addr, out value);
prop_addr = NextProperty(prop_addr);
} while ((value & mask) > Process.zargs[1]);
/* Exit if the property does not exist */
if ((value & mask) != Process.zargs[1])
{
Err.RuntimeError(ErrorCodes.ERR_NO_PROP);
}
}
/* Return the property id */
FastMem.LowByte(prop_addr, out value);
Process.Store((zword)(value & mask));
}/* z_get_next_prop */
}/* translate_from_zscii */
/*
* unicode_to_zscii
*
* Convert a Unicode character to ZSCII, returning 0 on failure.
*
*/
internal static zbyte UnicodeToZscii(zword c)
{
int i;
if (c >= CharCodes.ZC_LATIN1_MIN)
{
if (Main.hx_unicode_table != 0)
{ /* game has its own Unicode table */
FastMem.LowByte(Main.hx_unicode_table, out zbyte N);
for (i = 0x9b; i < 0x9b + N; i++)
{
zword addr = (zword)(Main.hx_unicode_table + 1 + 2 * (i - 0x9b));
FastMem.LowWord(addr, out zword 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_get_prop_len */
/*
* z_get_sibling, store the sibling of an object.
*
* Process.zargs[0] = object
*
*/
internal static void ZGetSibling()
{
zword obj_addr;
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_GET_SIBLING_0);
Process.Store(0);
Process.Branch(false);
return;
}
obj_addr = ObjectAddress(Process.zargs[0]);
if (Main.h_version <= ZMachine.V3)
{
/* Get sibling id from object */
obj_addr += O1_SIBLING;
FastMem.LowByte(obj_addr, out byte 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
{
/* Get sibling id from object */
obj_addr += O4_SIBLING;
FastMem.LowWord(obj_addr, out ushort sibling);
/* Store sibling and branch */
Process.Store(sibling);
Process.Branch(sibling > 0);
}
}/* z_get_sibling */
}/* z_set_attr */
/*
* z_test_attr, branch if an object attribute is set.
*
* Process.zargs[0] = object
* Process.zargs[1] = number of attribute to test
*
*/
internal static void ZTestAttr()
{
zword obj_addr;
if (Process.zargs[1] > ((Main.h_version <= ZMachine.V3) ? 31 : 47))
{
Err.RuntimeError(ErrorCodes.ERR_ILL_ATTR);
}
/* If we are monitoring attribute testing display a short note */
if (Main.option_attribute_testing == true)
{
Stream.StreamMssgOn();
Text.PrintString("@test_attr ");
Text.PrintObject(Process.zargs[0]);
Text.PrintString(" ");
Text.PrintNum(Process.zargs[1]);
Stream.StreamMssgOff();
}
if (Process.zargs[0] == 0)
{
Err.RuntimeError(ErrorCodes.ERR_TEST_ATTR_0);
Process.Branch(false);
return;
}
/* Get attribute address */
obj_addr = (zword)(ObjectAddress(Process.zargs[0]) + Process.zargs[1] / 8);
/* Load attribute byte */
FastMem.LowByte(obj_addr, out byte value);
/* Test attribute */
Process.Branch((value & (0x80 >> (Process.zargs[1] & 7))) > 0);
}/* z_test_attr */
//zword unicode_tolower (zword);
/*
* is_terminator
*
* Check if the given key is an input terminator.
*
*/
internal static bool IsTerminator(zword key)
{
if (key == CharCodes.ZC_TIME_OUT)
{
return(true);
}
if (key == CharCodes.ZC_RETURN)
{
return(true);
}
if (key is >= CharCodes.ZC_HKEY_MIN and <= CharCodes.ZC_HKEY_MAX)
{
return(true);
}
if (Main.h_terminating_keys != 0)
{
if (key is >= CharCodes.ZC_ARROW_MIN and <= CharCodes.ZC_MENU_CLICK)
{
zword addr = Main.h_terminating_keys;
zbyte c;
do
{
FastMem.LowByte(addr, out c);
if (c == 0xff || key == Text.TranslateFromZscii(c))
{
return(true);
}
addr++;
} while (c != 0);
}
}
return(false);
}/* is_terminator */
}/* next_property */
/*
* unlink_object
*
* Unlink an object from its parent and siblings.
*
*/
private static void UnlinkObject(zword object_var)
{
zword parent_addr;
zword sibling_addr;
if (object_var == 0)
{
Err.RuntimeError(ErrorCodes.ERR_REMOVE_OBJECT_0);
return;
}
zword obj_addr = ObjectAddress(object_var);
if (Main.h_version <= ZMachine.V3)
{
zbyte zero = 0;
/* Get parent of object, and return if no parent */
obj_addr += O1_PARENT;
FastMem.LowByte(obj_addr, out byte parent);
if (parent == 0)
{
return;
}
/* Get (older) sibling of object and set both parent and sibling
* pointers to 0 */
FastMem.SetByte(obj_addr, zero);
obj_addr += (zword)(O1_SIBLING - O1_PARENT);
FastMem.LowByte(obj_addr, out byte older_sibling);
FastMem.SetByte(obj_addr, zero);
/* Get first child of parent (the youngest sibling of the object) */
parent_addr = (zword)(ObjectAddress(parent) + O1_CHILD);
FastMem.LowByte(parent_addr, out byte younger_sibling);
/* Remove object from the list of siblings */
if (younger_sibling == object_var)
{
FastMem.SetByte(parent_addr, older_sibling);
}
else
{
do
{
sibling_addr = (zword)(ObjectAddress(younger_sibling) + O1_SIBLING);
FastMem.LowByte(sibling_addr, out younger_sibling);
} while (younger_sibling != object_var);
FastMem.SetByte(sibling_addr, older_sibling);
}
}
else
{
zword zero = 0;
/* Get parent of object, and return if no parent */
obj_addr += O4_PARENT;
FastMem.LowWord(obj_addr, out zword parent);
if (parent == 0)
{
return;
}
/* Get (older) sibling of object and set both parent and sibling
* pointers to 0 */
FastMem.SetWord(obj_addr, zero);
obj_addr += (zword)(O4_SIBLING - O4_PARENT);
FastMem.LowWord(obj_addr, out ushort older_sibling);
FastMem.SetWord(obj_addr, zero);
/* Get first child of parent (the youngest sibling of the object) */
parent_addr = (zword)(ObjectAddress(parent) + O4_CHILD);
FastMem.LowWord(parent_addr, out ushort younger_sibling);
/* Remove object from the list of siblings */
if (younger_sibling == object_var)
{
FastMem.SetWord(parent_addr, older_sibling);
}
else
{
do
{
sibling_addr = (zword)(ObjectAddress(younger_sibling) + O4_SIBLING);
FastMem.LowWord(sibling_addr, out younger_sibling);
} while (younger_sibling != object_var);
FastMem.SetWord(sibling_addr, older_sibling);
}
}
}/* unlink_object */