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annotate xrogue/bolt.c @ 313:2f75940cc544

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Advanced Rogue 7: fix a string literal overwrite. pick_spell() attempted to capitalize type by overwriting the first character, changing it back later. All calls of pick_spell passed a string literal as type, and string literals should be considered immutable. This has been fixed by using a separate variable for the capitalized first character. XRogue already has a similar fix. Reported by John Harris of @Play.
author John "Elwin" Edwards
date Tue, 19 Oct 2021 20:39:00 -0400
parents e52a8a7ad4c5
children
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1 /*
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2 bolt.c - functions shooting an object across the room
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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 <string.h>
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22 #include "rogue.h"
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23
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24 /*
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25 * shoot_bolt fires a bolt from the given starting point in the
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26 * given direction
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27 */
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28
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29 void
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30 shoot_bolt(struct thing *shooter, coord start, coord dir, bool get_points,
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31 short reason, char *name, int damage)
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32 {
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33 unsigned char dirch = 0, ch;
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34 bool used, change, see_him;
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35 short y, x, bounces;
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36 coord pos;
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37 struct linked_list *target=NULL;
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38 struct {
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39 coord place;
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40 char oldch;
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41 } spotpos[BOLT_LENGTH];
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42
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43 switch (dir.y + dir.x) {
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44 case 0: dirch = '/';
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45 when 1: case -1: dirch = (dir.y == 0 ? '-' : '|');
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46 when 2: case -2: dirch = '\\';
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47 }
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48 pos.y = start.y + dir.y;
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49 pos.x = start.x + dir.x;
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50 used = FALSE;
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51 change = FALSE;
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52
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53 bounces = 0; /* No bounces yet */
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54 nofont(cw);
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55 for (y = 0; y < BOLT_LENGTH && !used; y++) {
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56 ch = winat(pos.y, pos.x) & A_CHARTEXT;
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57 spotpos[y].place = pos;
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58 spotpos[y].oldch = mvwinch(cw, pos.y, pos.x) & A_CHARTEXT;
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59
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60 /* Are we at hero? */
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61 if (ce(pos, hero)) goto at_hero;
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62
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63 switch (ch) {
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64 case SECRETDOOR:
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65 case VERTWALL:
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66 case HORZWALL:
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67 case ' ':
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68 if (dirch == '-' || dirch == '|') {
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69 dir.y = -dir.y;
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70 dir.x = -dir.x;
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71 }
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72 else {
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73 unsigned char chx = mvinch(pos.y-dir.y, pos.x) & A_CHARTEXT,
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74 chy = mvinch(pos.y, pos.x-dir.x) & A_CHARTEXT;
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75 bool anychange = FALSE; /* Did we change anthing */
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76
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77 if (chy == WALL || chy == SECRETDOOR ||
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78 chy == HORZWALL || chy == VERTWALL) {
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79 dir.y = -dir.y;
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80 change ^= TRUE; /* Change at least one direction */
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81 anychange = TRUE;
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82 }
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83 if (chx == WALL || chx == SECRETDOOR ||
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84 chx == HORZWALL || chx == VERTWALL) {
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85 dir.x = -dir.x;
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86 change ^= TRUE; /* Change at least one direction */
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87 anychange = TRUE;
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88 }
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89
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90 /* If we didn't make any change, make both changes */
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91 if (!anychange) {