view arogue7/save.c @ 162:600873555ec0

Don't swap signal handlers in md_shellescape(). md_shellescape() sets SIGINT and SIGQUIT to be ignored, storing the previous handlers, and restores them after the shell exits. But it mixed up the two handlers. Since the signals were usually handled by the same function, this fix doesn't have much effect, but anything that makes signal code less confusing is a good thing.
author John "Elwin" Edwards
date Mon, 08 Jun 2015 10:01:25 -0400
parents c697782a9b37
children 89deb1197a2d
line wrap: on
line source

/*
 * save.c - save and restore routines
 *
 * Advanced Rogue
 * Copyright (C) 1984, 1985, 1986 Michael Morgan, Ken Dalka and AT&T
 * All rights reserved.
 *
 * Based on "Rogue: Exploring the Dungeons of Doom"
 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
 * All rights reserved.
 *
 * See the file LICENSE.TXT for full copyright and licensing information.
 */

/*
 * save and restore routines
 *
 */

#include "curses.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include "rogue.h"
#include <fcntl.h>
#include <errno.h>
#include "mach_dep.h"
#ifdef PC7300
#include "sys/window.h"
extern struct uwdata wdata;
#endif

#if u370 || uts
#define ENCREAD(b,n,fd) read(fd,b,n)
#define ENCWRITE(b,n,fd) write(fd,b,n)
#endif
#ifndef ENCREAD
#define ENCREAD encread
#define ENCWRITE encwrite
#endif

typedef struct stat STAT;

extern char version[], encstr[];
/* extern bool _endwin; */
extern int errno;

STAT sbuf;

bool
save_game()
{
    register int savefd;
    register int c;
    char buf[LINELEN];

    /*
     * get file name
     */
    mpos = 0;
    if (file_name[0] != '\0')
    {
        if (use_savedir)
	    msg("Save game? ");
        else
	    msg("Save file (%s)? ", file_name);
	do
	{
	    c = readchar();
	    if (c == ESCAPE) return(0);
	} while (c != 'n' && c != 'N' && c != 'y' && c != 'Y');
	mpos = 0;
	if (c == 'y' || c == 'Y')
	{
	    msg("File name: %s", file_name);
	    goto gotfile;
	}
    }

    if (use_savedir)
    {
	msg("");
	return FALSE;
    }

    do
    {
	msg("File name: ");
	mpos = 0;
	buf[0] = '\0';
	if (get_str(buf, msgw) == QUIT)
	{
	    msg("");
	    return FALSE;
	}
	strcpy(file_name, buf);
gotfile:
	if ((savefd = open(file_name, O_WRONLY|O_CREAT|O_TRUNC,0666)) < 0)
        {
	    msg(strerror(errno));	/* fake perror() */
            if (use_savedir)
                return FALSE;
        }
    } while (savefd < 0);

    /*
     * write out encrpyted file (after a stat)
     */
    if (save_file(savefd) == FALSE) {
	msg("Cannot create save file.");
	unlink(file_name);
	return(FALSE);
    }
    else return(TRUE);
}

/*
 * automatically save a file.  This is used if a HUP signal is
 * recieved
 */
void
auto_save(sig)
int sig;
{
    register int savefd;
    register int i;

    for (i = 0; i < NSIG; i++)
	signal(i, SIG_IGN);
    if (file_name[0] != '\0'	&& 
	pstats.s_hpt > 0	&&
	(savefd = open(file_name, O_WRONLY|O_CREAT|O_TRUNC, 0600)) >= 0)
	save_file(savefd);
    endwin();
#ifdef PC7300
    endhardwin();
#endif
    exit(1);
}

/*
 * write the saved game on the file
 */
bool
save_file(savefd)
register int savefd;
{
    register unsigned num_to_write, num_written;
    FILE *savef;
    int ret;

    wmove(cw, lines-1, 0);
    draw(cw);
    lseek(savefd, 0L, 0);
    fstat(savefd, &sbuf);
    num_to_write = strlen(version) + 1;
    num_written = ENCWRITE(version, num_to_write, savefd);
    sprintf(prbuf,"%d x %d\n", LINES, COLS);
    ENCWRITE(prbuf,80,savefd);
    savef = (FILE *) fdopen(savefd,"wb");
    ret = rs_save_file(savef);
    fclose(savef);
    if (num_to_write == num_written && ret == 0) return(TRUE);
    else return(FALSE);
}

restore(file, envp)
register char *file;
char **envp;
{
    register int inf;
    extern char **environ;
    char buf[LINELEN];
    STAT sbuf2;
    int oldcol, oldline;	/* Old number of columns and lines */

    if (strcmp(file, "-r") == 0)
	file = file_name;
    if ((inf = open(file, 0)) < 0)
    {
        if (use_savedir && errno == ENOENT)
        {
            return TRUE;
        }
	perror(file);
	return FALSE;
    }

    fflush(stdout);
    ENCREAD(buf, strlen(version) + 1, inf);
    if (strcmp(buf, version) != 0)
    {
	printf("Sorry, saved game is out of date.\n");
	return FALSE;
    }
    
    /*
     * Get the lines and columns from the previous game
     */

    ENCREAD(buf, 80, inf);
    sscanf(buf, "%d x %d\n", &oldline, &oldcol);
    fstat(inf, &sbuf2);
    fflush(stdout);

    initscr();
 
    if (COLS < oldcol || LINES < oldline) {
	endwin();
	printf("Cannot restart the game on a smaller screen.\n");
	return FALSE;
    }

    setup();
    /*
     * Set up windows
     */
    cw = newwin(lines, cols, 0, 0);
    mw = newwin(lines, cols, 0, 0);
    hw = newwin(lines, cols, 0, 0);
    msgw = newwin(4, cols, 0, 0);

    keypad(cw,1);
    keypad(msgw,1);

    if (rs_restore_file(inf) != 0)
    {
	printf("Cannot restore file\n");
	close(inf);
	return(FALSE);
    }

    cols = COLS;
    lines = LINES;
    if (cols > 85) cols = 85;
    if (lines > 24) lines = 24;

    mpos = 0;
    mvwprintw(msgw, 0, 0, "%s: %s", file, ctime(&sbuf2.st_mtime));

    /*
     * defeat multiple restarting from the same place
     */
    if (!wizard && md_unlink_open_file(file, inf) < 0) {
	printf("Cannot unlink file\n");
	return FALSE;
    }

    environ = envp;
    strcpy(file_name, file);
    setup();
    clearok(curscr, TRUE);
    touchwin(cw);
    srand(getpid());
    playit();
    /*NOTREACHED*/
    return(0);
}

#define ENCWBSIZ	1024
/*
 * perform an encrypted write
 */
encwrite(start, size, outf)
register char *start;
register unsigned size;
register int outf;
{
    register char *ep;
    register int i = 0;
    int	num_written = 0;
    auto char buf[ENCWBSIZ];

    ep = encstr;

    while (size--)
    {
	buf[i++] = *start++ ^ *ep++ ;
	if (*ep == '\0')
 	   ep = encstr;

	if (i == ENCWBSIZ || size == 0) {
	    if (write(outf, buf, (unsigned)i) < i) 
		 return(num_written);
	    else {
		num_written += i;
		i = 0;
	    }
	}
    }
    return(num_written);
}

/*
 * perform an encrypted read
 */
encread(start, size, inf)
register char *start;
register unsigned size;
register int inf;
{
    register char *ep;
    register int read_size;

    if ((read_size = read(inf, start, size)) == -1 || read_size == 0)
	return read_size;

    ep = encstr;

    size = read_size;
    while (size--)
    {
	*start++ ^= *ep++;
	if (*ep == '\0')
	    ep = encstr;
    }
    return read_size;
}