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annotate rogue5/scmisc.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 f502bf60e6e4
children
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33
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1 /*
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2 * copies of several routines needed for score
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3 *
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4 * @(#)smisc.c 4.7 (Berkeley) 02/05/99
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5 *
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6 * Rogue: Exploring the Dungeons of Doom
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7 * Copyright (C) 1980-1983, 1985, 1999 Michael Toy, Ken Arnold and Glenn Wichman
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8 * All rights reserved.
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9 *
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10 * See the file LICENSE.TXT for full copyright and licensing information.
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11 */
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12
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13 # include <stdio.h>
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14 # include <sys/types.h>
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15 # include <sys/stat.h>
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16 # include <ctype.h>
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17
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18 # define TRUE 1
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19 # define FALSE 0
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20 # define MAXSTR 80
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21 # define when break;case
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22 # define otherwise break;default
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23
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24 typedef struct {
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25 char *m_name;
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26 } MONST;
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27
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28 char *s_vowelstr();
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29
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30 char *lockfile = "/tmp/.fredlock";
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31
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32 char prbuf[MAXSTR]; /* buffer for sprintfs */
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33
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34 MONST monsters[] = {
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35 { "aquator" }, { "bat" }, { "centaur" }, { "dragon" }, { "emu" },
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36 { "venus flytrap" }, { "griffin" }, { "hobgoblin" }, { "ice monster" },
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37 { "jabberwock" }, { "kobold" }, { "leprechaun" }, { "medusa" },
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38 { "nymph" }, { "orc" }, { "phantom" }, { "quasit" }, { "rattlesnake" },
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39 { "snake" }, { "troll" }, { "ur-vile" }, { "vampire" }, { "wraith" },
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40 { "xeroc" }, { "yeti" }, { "zombie" }
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41 };
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42
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43 /*
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44 * s_lock_sc:
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45 * lock the score file. If it takes too long, ask the user if
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46 * they care to wait. Return TRUE if the lock is successful.
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47 */
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48 int
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49 s_lock_sc(void)
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50 {
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51 int cnt;
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52 struct stat sbuf;
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53
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54 over:
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55 close(8); /* just in case there are no files left */
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56 if (creat(lockfile, 0000) >= 0)
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57 return TRUE;
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58 for (cnt = 0; cnt < 5; cnt++)
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59 {
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60 md_sleep(1);
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61 if (creat(lockfile, 0000) >= 0)
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62 return TRUE;
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63 }
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64 if (stat(lockfile, &sbuf) < 0)
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65 {
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66 creat(lockfile, 0000);
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67 return TRUE;
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68 }
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69 if (time(NULL) - sbuf.st_mtime > 10)
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70 {
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71 if (md_unlink(lockfile) < 0)
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72 return FALSE;
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73 goto over;
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74 }
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75 else
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76 {
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77 printf("The score file is very busy. Do you want to wait longer\n");
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78 printf("for it to become free so your score can get posted?\n");
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79 printf("If so, type \"y\"\n");
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80 (void) fgets(prbuf, MAXSTR, stdin);
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81 if (prbuf[0] == 'y')
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82 for (;;)
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83 {
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84 if (creat(lockfile, 0000) >= 0)
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85 return TRUE;
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86 if (stat(lockfile, &sbuf) < 0)
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87 {
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88 creat(lockfile, 0000);
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89 return TRUE;
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90 }
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91 if (time(NULL) - sbuf.st_mtime > 10)
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92 {
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93 if (md_unlink(lockfile) < 0)
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94 return FALSE;
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95 }
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96 md_sleep(1);
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97 }
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98 else
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99 return FALSE;
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100 }
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101 }
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102
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103 /*
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104 * s_unlock_sc:
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105 * Unlock the score file
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106 */
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