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
193 lines
3.8 KiB
C
193 lines
3.8 KiB
C
/* table.c - Table handling opcodes
|
|
* Copyright (c) 1995-1997 Stefan Jokisch
|
|
*
|
|
* This file is part of Frotz.
|
|
*
|
|
* Frotz is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Frotz is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
|
|
#include "frotz.h"
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
void z_copy_table (void)
|
|
{
|
|
zword addr;
|
|
zword size = zargs[2];
|
|
zbyte value;
|
|
int i;
|
|
|
|
if (zargs[1] == 0) /* zero table */
|
|
|
|
for (i = 0; i < size; i++)
|
|
storeb ((zword) (zargs[0] + i), 0);
|
|
|
|
else if ((short) size < 0 || zargs[0] > zargs[1]) /* copy forwards */
|
|
|
|
for (i = 0; i < (((short) size < 0) ? - (short) size : size); i++) {
|
|
addr = zargs[0] + i;
|
|
LOW_BYTE (addr, value)
|
|
storeb ((zword) (zargs[1] + i), value);
|
|
}
|
|
|
|
else /* copy backwards */
|
|
|
|
for (i = size - 1; i >= 0; i--) {
|
|
addr = zargs[0] + i;
|
|
LOW_BYTE (addr, value)
|
|
storeb ((zword) (zargs[1] + i), value);
|
|
}
|
|
|
|
}/* 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
|
|
*
|
|
*/
|
|
|
|
void z_loadb (void)
|
|
{
|
|
zword addr = zargs[0] + zargs[1];
|
|
zbyte value;
|
|
|
|
LOW_BYTE (addr, value)
|
|
|
|
store (value);
|
|
|
|
}/* 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
|
|
*
|
|
*/
|
|
|
|
void z_loadw (void)
|
|
{
|
|
zword addr = zargs[0] + 2 * zargs[1];
|
|
zword value;
|
|
|
|
LOW_WORD (addr, value)
|
|
|
|
store (value);
|
|
|
|
}/* 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.
|
|
*
|
|
*/
|
|
|
|
void z_scan_table (void)
|
|
{
|
|
zword addr = zargs[1];
|
|
int i;
|
|
|
|
/* Supply default arguments */
|
|
|
|
if (zargc < 4)
|
|
zargs[3] = 0x82;
|
|
|
|
/* Scan byte or word array */
|
|
|
|
for (i = 0; i < zargs[2]; i++) {
|
|
|
|
if (zargs[3] & 0x80) { /* scan word array */
|
|
|
|
zword wvalue;
|
|
|
|
LOW_WORD (addr, wvalue)
|
|
|
|
if (wvalue == zargs[0])
|
|
goto finished;
|
|
|
|
} else { /* scan byte array */
|
|
|
|
zbyte bvalue;
|
|
|
|
LOW_BYTE (addr, bvalue)
|
|
|
|
if (bvalue == zargs[0])
|
|
goto finished;
|
|
|
|
}
|
|
|
|
addr += zargs[3] & 0x7f;
|
|
|
|
}
|
|
|
|
addr = 0;
|
|
|
|
finished:
|
|
|
|
store (addr);
|
|
branch (addr);
|
|
|
|
}/* z_scan_table */
|
|
|
|
/*
|
|
* z_storeb, write a byte into a table of bytes.
|
|
*
|
|
* zargs[0] = address of table
|
|
* zargs[1] = index of table entry
|
|
* zargs[2] = value to be written
|
|
*
|
|
*/
|
|
|
|
void z_storeb (void)
|
|
{
|
|
|
|
storeb ((zword) (zargs[0] + zargs[1]), zargs[2]);
|
|
|
|
}/* z_storeb */
|
|
|
|
/*
|
|
* z_storew, write a word into a table of words.
|
|
*
|
|
* zargs[0] = address of table
|
|
* zargs[1] = index of table entry
|
|
* zargs[2] = value to be written
|
|
*
|
|
*/
|
|
|
|
void z_storew (void)
|
|
{
|
|
|
|
storew ((zword) (zargs[0] + 2 * zargs[1]), zargs[2]);
|
|
|
|
}/* z_storew */
|