--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rogue3/save.c	Tue Oct 13 13:33:34 2009 +0000
@@ -0,0 +1,297 @@
+/*
+ * save and restore routines
+ *
+ * @(#)save.c	3.9 (Berkeley) 6/16/81
+ *
+ * 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.
+ */
+
+#include "curses.h"
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include "machdep.h"
+#include "rogue.h"
+
+typedef struct stat STAT;
+
+extern char version[], encstr[];
+
+STAT sbuf;
+
+int
+save_game()
+{
+    FILE *savef;
+    int c;
+    char buf[80];
+
+    /*
+     * get file name
+     */
+    mpos = 0;
+    if (file_name[0] != '\0')
+    {
+	msg("Save file (%s)? ", file_name);
+	do
+	{
+	    c = readchar(cw);
+	} while (c != 'n' && c != 'N' && c != 'y' && c != 'Y');
+	mpos = 0;
+	if (c == 'y' || c == 'Y')
+	{
+	    msg("File name: %s", file_name);
+	    goto gotfile;
+	}
+    }
+
+    do
+    {
+	msg("File name: ");
+	mpos = 0;
+	buf[0] = '\0';
+	if (get_str(buf, cw) == QUIT)
+	{
+	    msg("");
+	    return FALSE;
+	}
+	strcpy(file_name, buf);
+gotfile:
+	if ((savef = fopen(file_name, "w")) == NULL)
+	    msg(strerror(errno));	/* fake perror() */
+    } while (savef == NULL);
+
+    /*
+     * write out encrpyted file (after a stat)
+     * The fwrite is to force allocation of the buffer before the write
+     */
+    if (save_file(savef) != 0)
+    {
+        msg("Save game failed!");
+        return FALSE;
+    }
+    return TRUE;
+}
+
+/*
+ * automatically save a file.  This is used if a HUP signal is
+ * recieved
+ */
+void
+auto_save(int p)
+{
+    FILE *savef;
+    int i;
+
+    for (i = 0; i < NSIG; i++)
+	signal(i, SIG_IGN);
+    if (file_name[0] != '\0' && (savef = fopen(file_name, "w")) != NULL)
+	save_file(savef);
+    endwin();
+    exit(1);
+}
+
+/*
+ * write the saved game on the file
+ */
+int
+save_file(FILE *savef)
+{
+    char buf[80];
+    int ret;
+
+    wmove(cw, LINES-1, 0);
+    draw(cw);
+    (void) fseek(savef, 0L, 0);
+
+    memset(buf,0,80);
+    strcpy(buf,version);
+    encwrite(buf,80,savef);
+    memset(buf,0,80);
+    strcpy(buf,"R36 2\n");
+    encwrite(buf,80,savef);
+    memset(buf,0,80);
+    sprintf(buf,"%d x %d\n", LINES, COLS);
+    encwrite(buf,80,savef);
+
+    ret = rs_save_file(savef);
+
+    fclose(savef);
+
+    return(ret);
+}
+
+int
+restore(char *file, char **envp)
+{
+    FILE *inf;
+    extern char **environ;
+    char buf[80];
+    int slines, scols;
+    int rogue_version = 0, savefile_version = 0;
+
+    if (strcmp(file, "-r") == 0)
+	file = file_name;
+
+    if ((inf = fopen(file, "r")) == NULL)
+    {
+	perror(file);
+	return FALSE;
+    }
+
+    fflush(stdout);
+    encread(buf, 80, inf);
+
+    if (strcmp(buf, version) != 0)
+    {
+	printf("Sorry, saved game is out of date.\n");
+	return FALSE;
+    }
+
+    encread(buf, 80, inf);
+    (void) sscanf(buf, "R%d %d\n", &rogue_version, &savefile_version);
+
+    if ((rogue_version != 36) && (savefile_version != 2))
+    {
+	printf("Sorry, saved game format is out of date.\n");
+	return FALSE;
+    }
+
+    encread(buf,80,inf);
+    (void) sscanf(buf,"%d x %d\n",&slines, &scols);
+
+    /*
+     * we do not close the file so that we will have a hold of the
+     * inode for as long as possible
+     */
+
+    initscr();
+	
+    if (slines > LINES)
+    {
+	endwin();
+	printf("Sorry, original game was played on a screen with %d lines.\n",slines);
+	printf("Current screen only has %d lines. Unable to restore game\n",LINES);
+	return(FALSE);
+    }
+	
+    if (scols > COLS)
+    {
+	endwin();
+	printf("Sorry, original game was played on a screen with %d columns.\n",scols);
+	printf("Current screen only has %d columns. Unable to restore game\n",COLS);
+	return(FALSE);
+    }
+    
+    cw = newwin(LINES, COLS, 0, 0);
+    mw = newwin(LINES, COLS, 0, 0);
+    hw = newwin(LINES, COLS, 0, 0);
+    nocrmode();
+    keypad(cw,1);
+    mpos = 0;
+    mvwprintw(cw, 0, 0, "%s", file);
+
+    if (rs_restore_file(inf) != 0)
+    {
+	endwin();
+	printf("Cannot restore file\n");
+    	return(FALSE);
+    }
+	
+    if (!wizard && (md_unlink_open_file(file, inf) < 0))
+    {
+	endwin();
+    	printf("Cannot unlink file\n");
+	return FALSE;
+    }
+
+    environ = envp;
+    strcpy(file_name, file);
+    setup();
+    clearok(curscr, TRUE);
+    touchwin(cw);
+    srand(md_getpid());
+    status();
+    playit();
+    /*NOTREACHED*/
+    return(0);
+}
+
+static int encerrno = 0;
+
+int
+encerror()
+{
+    return encerrno;
+}
+
+void
+encseterr(int err)
+{
+    encerrno = err;
+}
+
+int
+encclearerr()
+{
+    int n = encerrno;
+
+    encerrno = 0;
+
+    return(n);
+}
+
+/*
+ * perform an encrypted write
+ */
+size_t
+encwrite(const void *buf, size_t size, FILE *outf)
+{
+    char *ep;
+    const char *start = buf;
+    size_t o_size = size;
+    ep = encstr;
+
+    while (size)
+    {
+	if (putc(*start++ ^ *ep++, outf) == EOF)
+	    return(o_size - size);
+	if (*ep == '\0')
+	    ep = encstr;
+	size--;
+    }
+
+    return(o_size - size);
+}
+
+/*
+ * perform an encrypted read
+ */
+size_t
+encread(void *buf, size_t size, FILE *inf)
+{
+    char *ep;
+    size_t read_size;
+    char *start = buf;
+
+    if ((read_size = fread(start,1,size,inf)) == 0)
+	return 0;
+
+    ep = encstr;
+
+    while (size--)
+    {
+	*start++ ^= *ep++;
+	if (*ep == '\0')
+	    ep = encstr;
+    }
+    return read_size;
+}