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annotate xrogue/io.c @ 314:2f0eb38da609

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Advanced Rogue 7: fix a crash when casting magic missile. do_zap() dereferenced a struct object pointer while ignoring the result of a NULL check. XRogue had the same problem, though triggering it was unlikely, since XRogue does not include a magic missile spell. Reported by John Harris of @Play.
author John "Elwin" Edwards
date Thu, 21 Oct 2021 21:00:15 -0400
parents e52a8a7ad4c5
children
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1 /*
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2 io.c - Various input/output functions
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3
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4 XRogue: Expeditions into the Dungeons of Doom
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5 Copyright (C) 1991 Robert Pietkivitch
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6 All rights reserved.
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7
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8 Based on "Advanced Rogue"
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9 Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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10 All rights reserved.
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11
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12 Based on "Rogue: Exploring the Dungeons of Doom"
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13 Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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14 All rights reserved.
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15
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16 See the file LICENSE.TXT for full copyright and licensing information.
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17 */
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18
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19 #include <curses.h>
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20 #include <ctype.h>
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21 #include <stdarg.h>
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ce0cf824c192 xrogue: add missing includes.
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22 #include <string.h>
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23 #include "rogue.h"
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24
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25 void doadd(char *fmt, va_list ap);
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26
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27 /*
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28 * msg:
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29 * Display a message at the top of the screen.
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30 */
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31
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32 static char msgbuf[BUFSIZ];
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33 static int newpos = 0;
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34
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35 /* VARARGS */
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36 void
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37 msg(char *fmt, ...)
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38 {
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39 va_list ap;
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40 /*
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41 * if the string is "", just clear the line
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42 */
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43 if (*fmt == '\0')
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44 {
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45 wclear(msgw);
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46 overwrite(cw, msgw);
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47 wmove(msgw, 0, 0);
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48 clearok(msgw, FALSE);
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49 draw(msgw);
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50 mpos = 0;
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51 return;
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52 }
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53 /*
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54 * otherwise add to the message and flush it out
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55 */
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56 va_start(ap, fmt);
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57 doadd(fmt, ap);
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58 va_end(ap);
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59 endmsg();
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60 }
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61
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62 /*
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63 * add things to the current message
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64 */
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65
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66 /* VARARGS */
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67 void
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68 addmsg(char *fmt, ...)
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69 {
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70 va_list ap;
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71
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72 va_start(ap, fmt);
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73 doadd(fmt, ap);
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74 va_end(ap);
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75 }
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76
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77 /*
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78 * If there is no current message, do nothing. Otherwise, prompt the
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79 * player with the --More-- string. Then erase the message.
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80 */
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81
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82 void
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83 rmmsg(void)
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84 {
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85 if (mpos) {
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86 wclear(msgw);
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87 overwrite(cw, msgw);
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88 mvwaddstr(msgw, 0, 0, huh);
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89 waddstr(msgw, morestr);
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90 clearok(msgw, FALSE);
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91 draw(msgw);
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92 wait_for(' ');
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93 msg("");
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94 }
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