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annotate arogue5/save.c @ 83:09db0cf536af

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Properly handle invalid room references in savefiles. In all games, rs_write_room_reference() stored -1 for a nonexistent room, but rs_read_room_reference() did not check for out-of-bounds values, leading to pointers to rooms[-1], which sometimes caused crashes. rs_read_room_reference() has now been modified to use NULL instead. Some of the games required further changes to replace NULL with the pointer to the actual room. Others are capable of handling NULL for objects not in any room.
author John "Elwin" Edwards
date Thu, 08 Aug 2013 12:41:35 -0700
parents ad2cb9a07aaa
children d852b8f088c5
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1 /*
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2 * save and restore routines
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3 *
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4 * Advanced Rogue
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5 * Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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6 * All rights reserved.
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7 *
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8 * Based on "Rogue: Exploring the Dungeons of Doom"
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9 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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10 * All rights reserved.
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11 *
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12 * See the file LICENSE.TXT for full copyright and licensing information.
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13 */
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14
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15 #include "curses.h"
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16 #include <stdlib.h>
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17 #include <string.h>
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18 #include <fcntl.h>
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19 #include <errno.h>
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20 #include <ctype.h>
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21 #include <sys/types.h>
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22 #include <sys/stat.h>
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23 #include <signal.h>
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24 #include "rogue.h"
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25
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26 typedef struct stat STAT;
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27
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28 extern char version[], encstr[];
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29 /* extern bool _endwin; */
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30
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31 STAT sbuf;
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32
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33 bool
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34 save_game()
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35 {
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36 register FILE *savef;
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37 register int c;
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38 char buf[LINELEN];
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39
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40 /*
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41 * get file name
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42 */
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43 mpos = 0;
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44 if (file_name[0] != '\0')
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45 {
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46 if (use_savedir)
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47 msg("Save game? ");
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48 else
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49 msg("Save file (%s)? ", file_name);
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50 do
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51 {
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52 c = readchar();
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53 if (c == ESCAPE) return(0);
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54 } while (c != 'n' && c != 'N' && c != 'y' && c != 'Y');
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55 mpos = 0;
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56 if (c == 'y' || c == 'Y')
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57 {
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58 msg("File name: %s", file_name);
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59 goto gotfile;
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60 }
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61 if (use_savedir) {
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62 msg("");
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63 return FALSE;
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64 }
63
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65 }
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66
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67 do
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68 {
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69 msg("File name: ");
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70 mpos = 0;
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71 buf[0] = '\0';
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72 if (get_str(buf, msgw) == QUIT)
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73 {
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74 msg("");
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75 return FALSE;
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76 }
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77 msg("");
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78 strcpy(file_name, buf);
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79 gotfile:
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80 if ((savef = fopen(file_name, "w")) == NULL)
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81 {
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82 msg(strerror(errno)); /* fake perror() */
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83 if (use_savedir)
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84 return FALSE;
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85 }
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86 } while (savef == NULL);
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87
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88 /*
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89 * write out encrpyted file (after a stat)
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90 * The fwrite is to force allocation of the buffer before the write
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91 */
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92 if (save_file(savef) != 0) {
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93 msg("Cannot create save file.");
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94 unlink(file_name);
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95 return(FALSE);
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96 }
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97 else return(TRUE);
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98 }
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99
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100 /*
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101 * automatically save a file. This is used if a HUP signal is
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102 * recieved
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103 */