c661fd79d4
Switching from Unix file descriptor operations to C standard FILE* functions will reduce portability problems.
370 lines
7 KiB
C
370 lines
7 KiB
C
/*
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* save and restore routines
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*
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* @(#)save.c 4.15 (Berkeley) 5/10/82
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*
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* Rogue: Exploring the Dungeons of Doom
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* Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
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* All rights reserved.
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*
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* See the file LICENSE.TXT for full copyright and licensing information.
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*/
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#include <curses.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#define KERNEL
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#include <signal.h>
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#undef KERNEL
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#include "rogue.h"
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void save_file(FILE *savef);
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extern int rs_save_file(FILE *savef);
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extern int rs_restore_file(FILE *inf);
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typedef struct stat STAT;
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extern char version[], encstr[];
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extern bool _endwin;
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STAT sbuf;
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/*
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* save_game:
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* Implement the "save game" command
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*/
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/* This has to be cleaned up, these goto's are annoying. */
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bool
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save_game(void)
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{
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register FILE *savef;
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register int c;
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char buf[256];
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/*
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* get file name
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*/
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mpos = 0;
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over:
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if (file_name[0] != '\0')
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{
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for (;;)
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{
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if (use_savedir)
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msg("Save game? ");
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else
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msg("save file (%s)? ", file_name);
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c = getchar();
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mpos = 0;
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if (c == ESCAPE)
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{
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msg("");
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return FALSE;
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}
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else if (c == 'n' || c == 'N' || c == 'y' || c == 'Y')
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break;
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else
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msg("please answer Y or N");
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}
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if (c == 'y' || c == 'Y')
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{
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strcpy(buf, file_name);
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goto gotfile;
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}
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}
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if (use_savedir)
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{
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/* You can't change the savefile if you're using the system
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savedir, because that means you have privileges. */
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msg("");
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return FALSE;
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}
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do
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{
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mpos = 0;
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msg("file name: ");
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buf[0] = '\0';
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if (get_str(buf, stdscr) == QUIT)
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{
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quit:
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msg("");
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return FALSE;
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}
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mpos = 0;
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gotfile:
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/*
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* test to see if the file exists
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*/
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if (stat(buf, &sbuf) >= 0)
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{
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for (;;)
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{
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msg("File exists. Do you wish to overwrite it?");
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mpos = 0;
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if ((c = readchar()) == ESCAPE)
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goto quit;
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if (c == 'y' || c == 'Y')
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break;
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else if (c == 'n' || c == 'N')
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goto over;
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else
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msg("Please answer Y or N");
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}
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msg("file name: %s", buf);
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}
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strcpy(file_name, buf);
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if ((savef = fopen(file_name, "w")) == NULL)
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{
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msg(strerror(errno)); /* fake perror() */
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if (use_savedir)
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return FALSE;
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}
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} while (savef == NULL);
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/*
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* write out encrpyted file (after a stat)
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* The fwrite is to force allocation of the buffer before the write
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*/
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save_file(savef);
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return TRUE;
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}
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/*
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* auto_save:
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* Automatically save a file. This is used if a HUP signal is
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* recieved
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*/
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void
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auto_save(int sig)
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{
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register FILE *savef;
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md_ignore_signals();
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if (file_name[0] != '\0' && (savef = fopen(file_name, "w")) != NULL)
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save_file(savef);
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endwin();
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exit(1);
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}
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/*
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* save_file:
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* Write the saved game on the file
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*/
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void
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save_file(FILE *savef)
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{
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int slines = LINES;
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int scols = COLS;
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/*
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* close any open score file
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*/
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if (score_file != NULL) {
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fclose(score_file);
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score_file = NULL;
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}
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move(LINES-1, 0);
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refresh();
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fstat(md_fileno(savef), &sbuf);
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/*
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* DO NOT DELETE. This forces stdio to allocate the output buffer
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* so that malloc doesn't get confused on restart
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*/
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fwrite("junk", 1, 5, savef);
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fseek(savef, 0L, 0);
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encwrite(version,strlen(version)+1,savef);
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encwrite(&slines,sizeof(slines),savef);
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encwrite(&scols,sizeof(scols),savef);
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msg("");
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rs_save_file(savef);
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fclose(savef);
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}
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/*
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* restore:
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* Restore a saved game from a file with elaborate checks for file
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* integrity from cheaters
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*/
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bool
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restore(char *file, char **envp)
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{
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FILE *inf;
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register bool syml;
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extern char **environ;
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char buf[MAXSTR];
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STAT sbuf2;
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int slines, scols;
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if (strcmp(file, "-r") == 0)
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file = file_name;
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#ifdef SIGTSTP
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/*
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* If a process can be suspended, this code wouldn't work
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*/
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signal(SIGTSTP, SIG_IGN);
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#endif
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if ((inf = fopen(file, "r")) == NULL)
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{
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if (use_savedir && errno == ENOENT)
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{
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/* We're using a system savefile which doesn't exist.
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This isn't a fatal error, it means start a new game. */
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return TRUE;
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}
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perror(file);
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return FALSE;
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}
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fflush(stdout);
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encread(buf, strlen(version) + 1, inf);
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if (strcmp(buf, version) != 0)
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{
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printf("Sorry, saved game is out of date.\n");
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return FALSE;
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}
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stat(file, &sbuf2);
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fflush(stdout);
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syml = issymlink(file);
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fflush(stdout);
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encread(&slines,sizeof(slines),inf);
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encread(&scols,sizeof(scols),inf);
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/*
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* we do not close the file so that we will have a hold of the
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* inode for as long as possible
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*/
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initscr();
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if (slines > LINES)
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{
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endwin();
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printf("Sorry, original game was played on a screen with %d lines.\n",slines);
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printf("Current screen only has %d lines. Unable to restore game\n",LINES);
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return(FALSE);
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}
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if (scols > COLS)
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{
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endwin();
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printf("Sorry, original game was played on a screen with %d columns.\n",scols);
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printf("Current screen only has %d columns. Unable to restore game\n",COLS);
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return(FALSE);
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}
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hw = newwin(LINES, COLS, 0, 0);
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keypad(stdscr,1);
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mpos = 0;
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mvprintw(0, 0, "%s: %s", file, ctime(&sbuf2.st_mtime));
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if (rs_restore_file(inf) == FALSE)
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{
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endwin();
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printf("Cannot restore file\n");
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return(FALSE);
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}
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if (
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#ifdef WIZARD
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!wizard &&
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#endif
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md_unlink_open_file(file, inf) < 0)
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{
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endwin();
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printf("Cannot unlink file\n");
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return FALSE;
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}
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/*
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* defeat multiple restarting from the same place
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*/
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#ifdef WIZARD
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if (!wizard)
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#endif
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if (sbuf2.st_nlink != 1 || syml)
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{
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endwin();
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printf("Cannot restore from a linked file\n");
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return FALSE;
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}
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if (pstats.s_hpt <= 0) {
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endwin();
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printf("This character is already dead.\n");
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return FALSE;
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}
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#ifdef SIGTSTP
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signal(SIGTSTP, tstp);
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#endif
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environ = envp;
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strcpy(file_name, file);
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setup();
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clearok(curscr, TRUE);
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touchwin(stdscr);
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srand(md_random_seed());
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msg("file name: %s", file);
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status();
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playit();
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return 0;
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}
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/*
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* encwrite:
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* Perform an encrypted write
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*/
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void
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encwrite(void *starta, int size, FILE *outf)
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{
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register char *ep;
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register char *start = (char *) starta;
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ep = encstr;
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while (size--)
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{
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putc(*start++ ^ *ep++, outf);
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if (*ep == '\0')
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ep = encstr;
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}
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}
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/*
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* encread:
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* Perform an encrypted read
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*/
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int
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encread(void *starta, int size, FILE *inf)
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{
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register char *ep;
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register int read_size;
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register char *start = (char *) starta;
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if ((read_size = fread(start, 1, size, inf)) == 0)
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return read_size;
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ep = encstr;
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while (size--)
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{
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*start++ ^= *ep++;
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if (*ep == '\0')
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ep = encstr;
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}
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return read_size;
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}
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