Mercurial > hg > early-roguelike
annotate rogue5/daemon.c @ 280:70aa5808c782
Fix potential segfaults at restore related to ctime().
In some games, restore() passes the result of ctime() to mvprintw() or
some other variadic message-formatting function. If ctime() has not
been declared properly, its return type is inferred to be int instead
of char *. This does not cause a warning because the compiler does not
know the correct type of variadic arguments.
On platforms where ints and pointers are not the same size, this can,
probably depending on alignment, result in a segfault that is not easy
to trace.
Including time.h fixes the problem. Some games manually declared
ctime() and avoided the bug. These declarations have also been
replaced with the include.
author | John "Elwin" Edwards |
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date | Fri, 15 Sep 2017 20:51:10 -0400 |
parents | f502bf60e6e4 |
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rev | line source |
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33
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1 /* |
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2 * Contains functions for dealing with things that happen in the |
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3 * future. |
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4 * |
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5 * @(#)daemon.c 4.7 (Berkeley) 02/05/99 |
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6 * |
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7 * Rogue: Exploring the Dungeons of Doom |
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8 * Copyright (C) 1980-1983, 1985, 1999 Michael Toy, Ken Arnold and Glenn Wichman |
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9 * All rights reserved. |
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10 * |
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11 * See the file LICENSE.TXT for full copyright and licensing information. |
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12 */ |
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13 |
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14 #include <curses.h> |
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15 #include "rogue.h" |
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16 |
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17 #define DAEMON -1 |
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18 |
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19 /* |
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20 * d_slot: |
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21 * Find an empty slot in the daemon/fuse list |
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22 */ |
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23 struct delayed_action * |
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24 d_slot(void) |
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25 { |
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26 struct delayed_action *dev; |
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27 |
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28 for (dev = d_list; dev <= &d_list[MAXDAEMONS-1]; dev++) |
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29 if (dev->d_type == EMPTY) |
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30 return dev; |
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31 #ifdef MASTER |
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32 debug("Ran out of fuse slots"); |
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33 #endif |
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34 return NULL; |
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35 } |
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36 |
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37 /* |
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38 * find_slot: |
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39 * Find a particular slot in the table |
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40 */ |
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41 struct delayed_action * |
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42 find_slot(void (*func)()) |
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43 { |
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44 struct delayed_action *dev; |
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45 |
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46 for (dev = d_list; dev <= &d_list[MAXDAEMONS-1]; dev++) |
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47 if (dev->d_type != EMPTY && func == dev->d_func) |
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48 return dev; |
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49 return NULL; |
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50 } |
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51 |
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52 /* |
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53 * start_daemon: |
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54 * Start a daemon, takes a function. |
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55 */ |
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56 void |
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57 start_daemon(void (*func)(), int arg, int type) |
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58 { |
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59 struct delayed_action *dev; |
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60 |
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61 dev = d_slot(); |
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62 dev->d_type = type; |
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63 dev->d_func = func; |
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64 dev->d_arg = arg; |
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65 dev->d_time = DAEMON; |
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66 } |
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67 |
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68 /* |
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69 * kill_daemon: |
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70 * Remove a daemon from the list |
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71 */ |
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72 void |
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73 kill_daemon(void (*func)()) |
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74 { |
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75 struct delayed_action *dev; |
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76 |
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77 if ((dev = find_slot(func)) == NULL) |
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78 return; |
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79 /* |
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80 * Take it out of the list |
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81 */ |
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82 dev->d_type = EMPTY; |
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83 } |
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84 |
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85 /* |
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86 * do_daemons: |
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87 * Run all the daemons that are active with the current flag, |
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88 * passing the argument to the function. |
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89 */ |
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90 void |
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91 do_daemons(int flag) |
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92 { |
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93 struct delayed_action *dev; |
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94 |
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95 /* |
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96 * Loop through the devil list |
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97 */ |
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98 for (dev = d_list; dev <= &d_list[MAXDAEMONS-1]; dev++) |
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99 /* |
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100 * Executing each one, giving it the proper arguments |
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101 */ |
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102 if (dev->d_type == flag && dev->d_time == DAEMON) |
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103 (*dev->d_func)(dev->d_arg); |
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104 } |
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105 |
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106 /* |
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107 * fuse: |