1012 lines
22 KiB
C
1012 lines
22 KiB
C
/* fastmem.c - Memory related functions (fast version without virtual memory)
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* Copyright (c) 1995-1997 Stefan Jokisch
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*
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* Changes for Rockbox copyright 2009 Torne Wuff
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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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/*
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* New undo mechanism added by Jim Dunleavy <jim.dunleavy@erha.ie>
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*/
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#include "frotz.h"
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#define far
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extern void seed_random (int);
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extern void restart_screen (void);
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extern void refresh_text_style (void);
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extern void call (zword, int, zword *, int);
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extern void split_window (zword);
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extern void script_open (void);
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extern void script_close (void);
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extern zword save_quetzal (int, int);
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extern zword restore_quetzal (int, int);
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extern void erase_window (zword);
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extern void (*op0_opcodes[]) (void);
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extern void (*op1_opcodes[]) (void);
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extern void (*op2_opcodes[]) (void);
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extern void (*var_opcodes[]) (void);
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char save_name[MAX_PATH];
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char auxilary_name[MAX_PATH];
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zbyte far *zmp = NULL;
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zbyte far *pcp = NULL;
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int story_fp = -1;
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/*
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* Data for the undo mechanism.
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* This undo mechanism is based on the scheme used in Evin Robertson's
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* Nitfol interpreter.
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* Undo blocks are stored as differences between states.
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*/
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typedef struct undo_struct undo_t;
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struct undo_struct {
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undo_t *next;
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undo_t *prev;
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long pc;
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long diff_size;
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zword frame_count;
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zword stack_size;
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zword frame_offset;
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/* undo diff and stack data follow */
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};
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static undo_t *first_undo = NULL, *last_undo = NULL, *curr_undo = NULL;
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static zbyte *prev_zmp, *undo_diff;
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static int undo_count = 0;
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static void *arena_start = NULL, *arena_end = NULL, *arena_next = NULL;
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/*
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* get_header_extension
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*
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* Read a value from the header extension (former mouse table).
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*
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*/
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zword get_header_extension (int entry)
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{
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zword addr;
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zword val;
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if (h_extension_table == 0 || entry > hx_table_size)
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return 0;
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addr = h_extension_table + 2 * entry;
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LOW_WORD (addr, val)
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return val;
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}/* get_header_extension */
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/*
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* set_header_extension
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*
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* Set an entry in the header extension (former mouse table).
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*
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*/
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void set_header_extension (int entry, zword val)
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{
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zword addr;
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if (h_extension_table == 0 || entry > hx_table_size)
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return;
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addr = h_extension_table + 2 * entry;
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SET_WORD (addr, val)
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}/* set_header_extension */
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/*
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* restart_header
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*
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* Set all header fields which hold information about the interpreter.
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*
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*/
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void restart_header (void)
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{
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zword screen_x_size;
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zword screen_y_size;
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zbyte font_x_size;
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zbyte font_y_size;
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int i;
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SET_BYTE (H_CONFIG, h_config)
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SET_WORD (H_FLAGS, h_flags)
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if (h_version >= V4) {
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SET_BYTE (H_INTERPRETER_NUMBER, h_interpreter_number)
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SET_BYTE (H_INTERPRETER_VERSION, h_interpreter_version)
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SET_BYTE (H_SCREEN_ROWS, h_screen_rows)
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SET_BYTE (H_SCREEN_COLS, h_screen_cols)
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}
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/* It's less trouble to use font size 1x1 for V5 games, especially
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because of a bug in the unreleased German version of "Zork 1" */
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if (h_version != V6) {
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screen_x_size = (zword) h_screen_cols;
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screen_y_size = (zword) h_screen_rows;
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font_x_size = 1;
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font_y_size = 1;
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} else {
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screen_x_size = h_screen_width;
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screen_y_size = h_screen_height;
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font_x_size = h_font_width;
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font_y_size = h_font_height;
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}
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if (h_version >= V5) {
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SET_WORD (H_SCREEN_WIDTH, screen_x_size)
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SET_WORD (H_SCREEN_HEIGHT, screen_y_size)
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SET_BYTE (H_FONT_HEIGHT, font_y_size)
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SET_BYTE (H_FONT_WIDTH, font_x_size)
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SET_BYTE (H_DEFAULT_BACKGROUND, h_default_background)
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SET_BYTE (H_DEFAULT_FOREGROUND, h_default_foreground)
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}
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if (h_version == V6)
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for (i = 0; i < 8; i++)
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storeb ((zword) (H_USER_NAME + i), h_user_name[i]);
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SET_BYTE (H_STANDARD_HIGH, h_standard_high)
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SET_BYTE (H_STANDARD_LOW, h_standard_low)
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}/* restart_header */
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/*
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* init_memory
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*
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* Allocate memory and load the story file.
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*
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*/
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void init_memory (void)
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{
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long size;
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zword addr;
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unsigned n;
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int i, j;
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zbyte *audiobuf;
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size_t buf_size;
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static struct {
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enum story story_id;
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zword release;
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zbyte serial[6];
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} records[] = {
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{ SHERLOCK, 21, "871214" },
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{ SHERLOCK, 26, "880127" },
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{ BEYOND_ZORK, 47, "870915" },
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{ BEYOND_ZORK, 49, "870917" },
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{ BEYOND_ZORK, 51, "870923" },
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{ BEYOND_ZORK, 57, "871221" },
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{ ZORK_ZERO, 296, "881019" },
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{ ZORK_ZERO, 366, "890323" },
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{ ZORK_ZERO, 383, "890602" },
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{ ZORK_ZERO, 393, "890714" },
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{ SHOGUN, 292, "890314" },
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{ SHOGUN, 295, "890321" },
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{ SHOGUN, 311, "890510" },
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{ SHOGUN, 322, "890706" },
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{ ARTHUR, 54, "890606" },
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{ ARTHUR, 63, "890622" },
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{ ARTHUR, 74, "890714" },
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{ JOURNEY, 26, "890316" },
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{ JOURNEY, 30, "890322" },
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{ JOURNEY, 77, "890616" },
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{ JOURNEY, 83, "890706" },
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{ LURKING_HORROR, 203, "870506" },
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{ LURKING_HORROR, 219, "870912" },
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{ LURKING_HORROR, 221, "870918" },
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{ UNKNOWN, 0, "------" }
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};
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/* Open story file */
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if ((story_fp = rb->open(story_name, O_RDONLY)) < 0)
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os_fatal ("Cannot open story file");
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/* Allocate memory for story header */
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zmp = rb->plugin_get_buffer(&buf_size);
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/* Load header into memory */
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if (fread (zmp, 1, 64, story_fp) != 64)
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os_fatal ("Story file read error");
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/* Copy header fields to global variables */
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LOW_BYTE (H_VERSION, h_version)
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if (h_version < V1 || h_version > V8)
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os_fatal ("Unknown Z-code version");
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LOW_BYTE (H_CONFIG, h_config)
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if (h_version == V3 && (h_config & CONFIG_BYTE_SWAPPED))
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os_fatal ("Byte swapped story file");
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LOW_WORD (H_RELEASE, h_release)
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LOW_WORD (H_RESIDENT_SIZE, h_resident_size)
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LOW_WORD (H_START_PC, h_start_pc)
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LOW_WORD (H_DICTIONARY, h_dictionary)
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LOW_WORD (H_OBJECTS, h_objects)
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LOW_WORD (H_GLOBALS, h_globals)
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LOW_WORD (H_DYNAMIC_SIZE, h_dynamic_size)
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LOW_WORD (H_FLAGS, h_flags)
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for (i = 0, addr = H_SERIAL; i < 6; i++, addr++)
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LOW_BYTE (addr, h_serial[i])
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/* Auto-detect buggy story files that need special fixes */
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story_id = UNKNOWN;
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for (i = 0; records[i].story_id != UNKNOWN; i++) {
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if (h_release == records[i].release) {
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for (j = 0; j < 6; j++)
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if (h_serial[j] != records[i].serial[j])
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goto no_match;
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story_id = records[i].story_id;
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}
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no_match: ; /* null statement */
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}
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LOW_WORD (H_ABBREVIATIONS, h_abbreviations)
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LOW_WORD (H_FILE_SIZE, h_file_size)
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/* Calculate story file size in bytes */
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if (h_file_size != 0) {
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story_size = (long) 2 * h_file_size;
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if (h_version >= V4)
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story_size *= 2;
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if (h_version >= V6)
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story_size *= 2;
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} else { /* some old games lack the file size entry */
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fseek (story_fp, 0, SEEK_END);
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story_size = ftell (story_fp);
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fseek (story_fp, 64, SEEK_SET);
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}
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LOW_WORD (H_CHECKSUM, h_checksum)
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LOW_WORD (H_ALPHABET, h_alphabet)
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LOW_WORD (H_FUNCTIONS_OFFSET, h_functions_offset)
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LOW_WORD (H_STRINGS_OFFSET, h_strings_offset)
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LOW_WORD (H_TERMINATING_KEYS, h_terminating_keys)
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LOW_WORD (H_EXTENSION_TABLE, h_extension_table)
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/* Zork Zero Macintosh doesn't have the graphics flag set */
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if (story_id == ZORK_ZERO && h_release == 296)
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h_flags |= GRAPHICS_FLAG;
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/* Adjust opcode tables */
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if (h_version <= V4) {
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op0_opcodes[0x09] = z_pop;
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op1_opcodes[0x0f] = z_not;
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} else {
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op0_opcodes[0x09] = z_catch;
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op1_opcodes[0x0f] = z_call_n;
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}
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/* Allocate memory for story data */
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if ((size_t)story_size > buf_size)
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{
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audiobuf = rb->plugin_get_audio_buffer(&buf_size);
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if ((size_t)story_size > buf_size)
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os_fatal ("Out of memory");
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rb->memcpy(audiobuf, zmp, 64);
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zmp = audiobuf;
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}
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/* Assign left over memory as the arena for undo alloc */
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arena_start = arena_next = (void*)((intptr_t)(zmp + story_size + 3) & ~3);
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arena_end = zmp + buf_size;
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/* Load story file in chunks of 32KB */
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n = 0x8000;
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for (size = 64; size < story_size; size += n) {
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if (story_size - size < 0x8000)
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n = (unsigned) (story_size - size);
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SET_PC (size)
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if (fread (pcp, 1, n, story_fp) != (signed)n)
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os_fatal ("Story file read error");
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}
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/* Read header extension table */
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hx_table_size = get_header_extension (HX_TABLE_SIZE);
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hx_unicode_table = get_header_extension (HX_UNICODE_TABLE);
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}/* init_memory */
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/*
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* init_undo
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*
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* Allocate memory for multiple undo. It is important not to occupy
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* all the memory available, since the IO interface may need memory
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* during the game, e.g. for loading sounds or pictures.
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*
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*/
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void init_undo (void)
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{
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/* Allocate h_dynamic_size bytes for previous dynamic zmp state
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+ 1.5 h_dynamic_size for Quetzal diff + 2. */
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int size = (h_dynamic_size * 5) / 2 + 2;
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if ((arena_end - arena_start) >= size) {
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prev_zmp = arena_start;
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undo_diff = arena_start + h_dynamic_size;
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arena_start = (void*)((intptr_t)(arena_start + size + 3) & ~3);
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arena_next = arena_start;
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memcpy (prev_zmp, zmp, h_dynamic_size);
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} else
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f_setup.undo_slots = 0;
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}/* init_undo */
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/*
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* free_undo
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*
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* Free count undo blocks from the beginning of the undo list.
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*
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*/
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static void free_undo (int count)
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{
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if (count > undo_count)
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count = undo_count;
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while (count--) {
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if (curr_undo == first_undo)
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curr_undo = curr_undo->next;
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first_undo = first_undo->next;
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undo_count--;
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}
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if (first_undo)
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first_undo->prev = NULL;
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else
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last_undo = NULL;
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}/* free_undo */
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/*
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* reset_memory
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*
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* Close the story file and deallocate memory.
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*
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*/
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void reset_memory (void)
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{
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if (story_fp != -1)
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fclose (story_fp);
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story_fp = -1;
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free_undo (undo_count);
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undo_count = 0;
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arena_start = NULL;
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arena_end = NULL;
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arena_next = NULL;
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zmp = NULL;
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}/* reset_memory */
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/*
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* storeb
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*
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* Write a byte value to the dynamic Z-machine memory.
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*
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*/
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void storeb (zword addr, zbyte value)
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{
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if (addr >= h_dynamic_size)
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runtime_error (ERR_STORE_RANGE);
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if (addr == H_FLAGS + 1) { /* flags register is modified */
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h_flags &= ~(SCRIPTING_FLAG | FIXED_FONT_FLAG);
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h_flags |= value & (SCRIPTING_FLAG | FIXED_FONT_FLAG);
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if (value & SCRIPTING_FLAG) {
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if (!ostream_script)
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script_open ();
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} else {
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if (ostream_script)
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script_close ();
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}
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refresh_text_style ();
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}
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SET_BYTE (addr, value)
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}/* storeb */
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/*
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* storew
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*
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* Write a word value to the dynamic Z-machine memory.
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*
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*/
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void storew (zword addr, zword value)
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{
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storeb ((zword) (addr + 0), hi (value));
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storeb ((zword) (addr + 1), lo (value));
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}/* storew */
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/*
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* z_restart, re-load dynamic area, clear the stack and set the PC.
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*
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* no zargs used
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*
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*/
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void z_restart (void)
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{
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static bool first_restart = TRUE;
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flush_buffer ();
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os_restart_game (RESTART_BEGIN);
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seed_random (0);
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if (!first_restart) {
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fseek (story_fp, 0, SEEK_SET);
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if (fread (zmp, 1, h_dynamic_size, story_fp) != h_dynamic_size)
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os_fatal ("Story file read error");
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} else first_restart = FALSE;
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restart_header ();
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restart_screen ();
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sp = fp = stack + STACK_SIZE;
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frame_count = 0;
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if (h_version != V6) {
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long pc = (long) h_start_pc;
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SET_PC (pc)
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} else call (h_start_pc, 0, NULL, 0);
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os_restart_game (RESTART_END);
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}/* z_restart */
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/*
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* get_default_name
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*
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* Read a default file name from the memory of the Z-machine and
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* copy it to a string.
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*
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*/
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static void get_default_name (char *default_name, zword addr)
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{
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if (addr != 0) {
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zbyte len;
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int i;
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LOW_BYTE (addr, len)
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addr++;
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for (i = 0; i < len; i++) {
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zbyte c;
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LOW_BYTE (addr, c)
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addr++;
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if (c >= 'A' && c <= 'Z')
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c += 'a' - 'A';
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default_name[i] = c;
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}
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default_name[i] = 0;
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|
|
if (strchr (default_name, '.') == NULL)
|
|
strcpy (default_name + i, ".AUX");
|
|
|
|
} else strcpy (default_name, auxilary_name);
|
|
|
|
}/* get_default_name */
|
|
|
|
/*
|
|
* z_restore, restore [a part of] a Z-machine state from disk
|
|
*
|
|
* zargs[0] = address of area to restore (optional)
|
|
* zargs[1] = number of bytes to restore
|
|
* zargs[2] = address of suggested file name
|
|
*
|
|
*/
|
|
|
|
void z_restore (void)
|
|
{
|
|
char new_name[MAX_PATH];
|
|
char default_name[MAX_PATH];
|
|
int gfp;
|
|
|
|
zword success = 0;
|
|
|
|
if (zargc != 0) {
|
|
|
|
/* Get the file name */
|
|
|
|
get_default_name (default_name, (zargc >= 3) ? zargs[2] : 0);
|
|
|
|
if (os_read_file_name (new_name, default_name, FILE_LOAD_AUX) == 0)
|
|
goto finished;
|
|
|
|
strcpy (auxilary_name, default_name);
|
|
|
|
/* Open auxilary file */
|
|
|
|
if ((gfp = rb->open (new_name, O_RDONLY)) < 0)
|
|
goto finished;
|
|
|
|
/* Load auxilary file */
|
|
|
|
success = fread (zmp + zargs[0], 1, zargs[1], gfp);
|
|
|
|
/* Close auxilary file */
|
|
|
|
fclose (gfp);
|
|
|
|
} else {
|
|
|
|
/* Get the file name */
|
|
|
|
if (os_read_file_name (new_name, save_name, FILE_RESTORE) == 0)
|
|
goto finished;
|
|
|
|
strcpy (save_name, new_name);
|
|
|
|
/* Open game file */
|
|
|
|
if ((gfp = rb->open (new_name, O_RDONLY)) < 0)
|
|
goto finished;
|
|
|
|
success = restore_quetzal (gfp, story_fp);
|
|
|
|
/* Close game file */
|
|
|
|
fclose (gfp);
|
|
|
|
if ((short) success >= 0) {
|
|
|
|
if ((short) success > 0) {
|
|
zbyte old_screen_rows;
|
|
zbyte old_screen_cols;
|
|
|
|
/* In V3, reset the upper window. */
|
|
if (h_version == V3)
|
|
split_window (0);
|
|
|
|
LOW_BYTE (H_SCREEN_ROWS, old_screen_rows);
|
|
LOW_BYTE (H_SCREEN_COLS, old_screen_cols);
|
|
|
|
/* Reload cached header fields. */
|
|
restart_header ();
|
|
|
|
/*
|
|
* Since QUETZAL files may be saved on many different machines,
|
|
* the screen sizes may vary a lot. Erasing the status window
|
|
* seems to cover up most of the resulting badness.
|
|
*/
|
|
if (h_version > V3 && h_version != V6
|
|
&& (h_screen_rows != old_screen_rows
|
|
|| h_screen_cols != old_screen_cols))
|
|
erase_window (1);
|
|
}
|
|
} else
|
|
os_fatal ("Error reading save file");
|
|
}
|
|
|
|
finished:
|
|
|
|
if (h_version <= V3)
|
|
branch (success);
|
|
else
|
|
store (success);
|
|
|
|
}/* z_restore */
|
|
|
|
/*
|
|
* mem_diff
|
|
*
|
|
* Set diff to a Quetzal-like difference between a and b,
|
|
* copying a to b as we go. It is assumed that diff points to a
|
|
* buffer which is large enough to hold the diff.
|
|
* mem_size is the number of bytes to compare.
|
|
* Returns the number of bytes copied to diff.
|
|
*
|
|
*/
|
|
|
|
static long mem_diff (zbyte *a, zbyte *b, zword mem_size, zbyte *diff)
|
|
{
|
|
unsigned size = mem_size;
|
|
zbyte *p = diff;
|
|
unsigned j;
|
|
zbyte c = 0;
|
|
|
|
for (;;) {
|
|
for (j = 0; size > 0 && (c = *a++ ^ *b++) == 0; j++)
|
|
size--;
|
|
if (size == 0) break;
|
|
size--;
|
|
if (j > 0x8000) {
|
|
*p++ = 0;
|
|
*p++ = 0xff;
|
|
*p++ = 0xff;
|
|
j -= 0x8000;
|
|
}
|
|
if (j > 0) {
|
|
*p++ = 0;
|
|
j--;
|
|
if (j <= 0x7f) {
|
|
*p++ = j;
|
|
} else {
|
|
*p++ = (j & 0x7f) | 0x80;
|
|
*p++ = (j & 0x7f80) >> 7;
|
|
}
|
|
}
|
|
*p++ = c;
|
|
*(b - 1) ^= c;
|
|
}
|
|
return p - diff;
|
|
}/* mem_diff */
|
|
|
|
/*
|
|
* mem_undiff
|
|
*
|
|
* Applies a quetzal-like diff to dest
|
|
*
|
|
*/
|
|
|
|
static void mem_undiff (zbyte *diff, long diff_length, zbyte *dest)
|
|
{
|
|
zbyte c;
|
|
|
|
while (diff_length) {
|
|
c = *diff++;
|
|
diff_length--;
|
|
if (c == 0) {
|
|
unsigned runlen;
|
|
|
|
if (!diff_length)
|
|
return; /* Incomplete run */
|
|
runlen = *diff++;
|
|
diff_length--;
|
|
if (runlen & 0x80) {
|
|
if (!diff_length)
|
|
return; /* Incomplete extended run */
|
|
c = *diff++;
|
|
diff_length--;
|
|
runlen = (runlen & 0x7f) | (((unsigned) c) << 7);
|
|
}
|
|
|
|
dest += runlen + 1;
|
|
} else {
|
|
*dest++ ^= c;
|
|
}
|
|
}
|
|
}/* mem_undiff */
|
|
|
|
/*
|
|
* restore_undo
|
|
*
|
|
* This function does the dirty work for z_restore_undo.
|
|
*
|
|
*/
|
|
|
|
int restore_undo (void)
|
|
{
|
|
|
|
if (f_setup.undo_slots == 0) /* undo feature unavailable */
|
|
|
|
return -1;
|
|
|
|
if (curr_undo == NULL) /* no saved game state */
|
|
|
|
return 0;
|
|
|
|
/* undo possible */
|
|
|
|
memcpy (zmp, prev_zmp, h_dynamic_size);
|
|
SET_PC (curr_undo->pc)
|
|
sp = stack + STACK_SIZE - curr_undo->stack_size;
|
|
fp = stack + curr_undo->frame_offset;
|
|
frame_count = curr_undo->frame_count;
|
|
mem_undiff ((zbyte *) (curr_undo + 1), curr_undo->diff_size, prev_zmp);
|
|
memcpy (sp, (zbyte *)(curr_undo + 1) + curr_undo->diff_size,
|
|
curr_undo->stack_size * sizeof (*sp));
|
|
|
|
curr_undo = curr_undo->prev;
|
|
|
|
restart_header ();
|
|
|
|
return 2;
|
|
|
|
}/* restore_undo */
|
|
|
|
/*
|
|
* z_restore_undo, restore a Z-machine state from memory.
|
|
*
|
|
* no zargs used
|
|
*
|
|
*/
|
|
|
|
void z_restore_undo (void)
|
|
{
|
|
|
|
store ((zword) restore_undo ());
|
|
|
|
}/* z_restore_undo */
|
|
|
|
/*
|
|
* z_save, save [a part of] the Z-machine state to disk.
|
|
*
|
|
* zargs[0] = address of memory area to save (optional)
|
|
* zargs[1] = number of bytes to save
|
|
* zargs[2] = address of suggested file name
|
|
*
|
|
*/
|
|
|
|
void z_save (void)
|
|
{
|
|
char new_name[MAX_PATH];
|
|
char default_name[MAX_PATH];
|
|
int gfp;
|
|
|
|
zword success = 0;
|
|
|
|
if (zargc != 0) {
|
|
|
|
/* Get the file name */
|
|
|
|
get_default_name (default_name, (zargc >= 3) ? zargs[2] : 0);
|
|
|
|
if (os_read_file_name (new_name, default_name, FILE_SAVE_AUX) == 0)
|
|
goto finished;
|
|
|
|
strcpy (auxilary_name, default_name);
|
|
|
|
/* Open auxilary file */
|
|
|
|
if ((gfp = rb->open (new_name, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
|
|
goto finished;
|
|
|
|
/* Write auxilary file */
|
|
|
|
success = fwrite (zmp + zargs[0], zargs[1], 1, gfp);
|
|
|
|
/* Close auxilary file */
|
|
|
|
fclose (gfp);
|
|
|
|
} else {
|
|
|
|
/* Get the file name */
|
|
|
|
if (os_read_file_name (new_name, save_name, FILE_SAVE) == 0)
|
|
goto finished;
|
|
|
|
strcpy (save_name, new_name);
|
|
|
|
/* Open game file */
|
|
|
|
if ((gfp = rb->open (new_name, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
|
|
goto finished;
|
|
|
|
success = save_quetzal (gfp, story_fp);
|
|
|
|
/* Close game file and check for errors */
|
|
|
|
if (fclose (gfp) != 0 || ferror (story_fp)) {
|
|
print_string ("Error writing save file\n");
|
|
goto finished;
|
|
}
|
|
|
|
/* Success */
|
|
|
|
success = 1;
|
|
|
|
}
|
|
|
|
finished:
|
|
|
|
if (h_version <= V3)
|
|
branch (success);
|
|
else
|
|
store (success);
|
|
|
|
}/* z_save */
|
|
|
|
/*
|
|
* save_undo
|
|
*
|
|
* This function does the dirty work for z_save_undo.
|
|
*
|
|
*/
|
|
|
|
int save_undo (void)
|
|
{
|
|
long diff_size;
|
|
zword stack_size;
|
|
int size;
|
|
undo_t *p;
|
|
|
|
if (f_setup.undo_slots == 0) /* undo feature unavailable */
|
|
return -1;
|
|
|
|
/* save undo possible */
|
|
|
|
while (last_undo != curr_undo) {
|
|
p = last_undo;
|
|
last_undo = last_undo->prev;
|
|
arena_next = p;
|
|
undo_count--;
|
|
}
|
|
if (last_undo)
|
|
last_undo->next = NULL;
|
|
else
|
|
first_undo = NULL;
|
|
|
|
if (undo_count == f_setup.undo_slots)
|
|
free_undo (1);
|
|
|
|
diff_size = mem_diff (zmp, prev_zmp, h_dynamic_size, undo_diff);
|
|
stack_size = stack + STACK_SIZE - sp;
|
|
do {
|
|
size = sizeof (undo_t) + diff_size + stack_size * sizeof (*sp);
|
|
if (arena_next > (void*)first_undo) {
|
|
/* Free space is all at the end */
|
|
if ((arena_end - arena_next) >= size) {
|
|
/* Trivial: enough room at the end */
|
|
p = arena_next;
|
|
arena_next = (void*)((intptr_t)(arena_next + size + 3) & ~3);
|
|
} else {
|
|
/* Need to wrap */
|
|
arena_next = arena_start;
|
|
p = NULL;
|
|
}
|
|
} else {
|
|
/* Free space is somewhere else */
|
|
if (((void*)first_undo - arena_next) >= size) {
|
|
/* There is room before the "first" undo */
|
|
p = arena_next;
|
|
arena_next = (void*)((intptr_t)(arena_next + size + 3) & ~3);
|
|
} else {
|
|
/* Not enough room, just need to free some */
|
|
p = NULL;
|
|
}
|
|
}
|
|
|
|
if (p == NULL)
|
|
free_undo (1);
|
|
} while (!p && undo_count);
|
|
if (p == NULL)
|
|
return -1;
|
|
GET_PC (p->pc)
|
|
p->frame_count = frame_count;
|
|
p->diff_size = diff_size;
|
|
p->stack_size = stack_size;
|
|
p->frame_offset = fp - stack;
|
|
memcpy (p + 1, undo_diff, diff_size);
|
|
memcpy ((zbyte *)(p + 1) + diff_size, sp, stack_size * sizeof (*sp));
|
|
|
|
if (!first_undo) {
|
|
p->prev = NULL;
|
|
first_undo = p;
|
|
} else {
|
|
last_undo->next = p;
|
|
p->prev = last_undo;
|
|
}
|
|
p->next = NULL;
|
|
curr_undo = last_undo = p;
|
|
undo_count++;
|
|
return 1;
|
|
|
|
}/* save_undo */
|
|
|
|
/*
|
|
* z_save_undo, save the current Z-machine state for a future undo.
|
|
*
|
|
* no zargs used
|
|
*
|
|
*/
|
|
|
|
void z_save_undo (void)
|
|
{
|
|
|
|
store ((zword) save_undo ());
|
|
|
|
}/* z_save_undo */
|
|
|
|
/*
|
|
* z_verify, check the story file integrity.
|
|
*
|
|
* no zargs used
|
|
*
|
|
*/
|
|
|
|
void z_verify (void)
|
|
{
|
|
zword checksum = 0;
|
|
long i;
|
|
|
|
/* Sum all bytes in story file except header bytes */
|
|
|
|
fseek (story_fp, 64, SEEK_SET);
|
|
|
|
for (i = 64; i < story_size; i++)
|
|
checksum += fgetc (story_fp);
|
|
|
|
/* Branch if the checksums are equal */
|
|
|
|
branch (checksum == h_checksum);
|
|
|
|
}/* z_verify */
|