Mercurial > hg > early-roguelike
annotate rogue3/io.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 | 527e2150eaf0 |
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rev | line source |
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0
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1 /* |
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2 * Various input/output functions |
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3 * |
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4 * @(#)io.c 3.10 (Berkeley) 6/15/81 |
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5 * |
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6 * Rogue: Exploring the Dungeons of Doom |
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7 * Copyright (C) 1980, 1981 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 <stdlib.h> |
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14 #include "curses.h" |
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15 #include <ctype.h> |
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16 #include <stdarg.h> |
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17 #include <string.h> |
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18 #include "machdep.h" |
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19 #include "rogue.h" |
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20 |
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21 /* |
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22 * msg: |
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23 * Display a message at the top of the screen. |
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24 */ |
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25 |
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26 static char msgbuf[BUFSIZ]; |
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27 static int newpos = 0; |
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28 |
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29 /*VARARGS1*/ |
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30 void |
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31 msg(char *fmt, ...) |
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32 { |
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33 va_list ap; |
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34 /* |
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35 * if the string is "", just clear the line |
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36 */ |
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37 if (*fmt == '\0') |
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38 { |
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39 wmove(cw, 0, 0); |
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40 wclrtoeol(cw); |
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41 mpos = 0; |
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42 return; |
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43 } |
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44 /* |
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45 * otherwise add to the message and flush it out |
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46 */ |
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47 va_start(ap, fmt); |
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48 doadd(fmt, ap); |
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49 va_end(ap); |
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50 endmsg(); |
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51 } |
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52 |
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53 /* |
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54 * add things to the current message |
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55 */ |
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56 void |
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57 addmsg(char *fmt, ...) |
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58 { |
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59 va_list ap; |
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60 |
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61 va_start(ap, fmt); |
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62 doadd(fmt, ap); |
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63 va_end(ap); |
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64 } |
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65 |
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66 /* |
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67 * Display a new msg (giving him a chance to see the previous one if it |
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68 * is up there with the --More--) |
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69 */ |
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70 void |
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71 endmsg() |
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72 { |
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73 strncpy(huh, msgbuf, 80); |
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74 huh[79] = 0; |
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75 |
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76 if (mpos) |
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77 { |
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78 wmove(cw, 0, mpos); |
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79 waddstr(cw, "--More--"); |
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80 draw(cw); |
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81 wait_for(cw,' '); |
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82 } |
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83 mvwaddstr(cw, 0, 0, msgbuf); |
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84 wclrtoeol(cw); |
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85 mpos = newpos; |
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86 newpos = 0; |
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87 draw(cw); |
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88 } |
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89 |
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90 void |
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91 doadd(char *fmt, va_list ap) |
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92 { |
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93 vsprintf(&msgbuf[newpos], fmt, ap); |
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94 newpos = (int) strlen(msgbuf); |
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95 } |
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96 |
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97 /* |
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98 * step_ok: |
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99 * returns true if it is ok to step on ch |
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100 */ |
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101 |
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102 int |
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103 step_ok(int ch) |
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104 { |
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105 switch (ch) |
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106 { |
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107 case ' ': |
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108 |