Mercurial > hg > early-roguelike

annotate arogue7/chase.c @ 144:708bb2dea17c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
arogue7, xrogue: prevent potential NULL dereferencing. It is possible for getpwuid() to fail and return NULL. Various md_get* functions now check for this.
author John "Elwin" Edwards
date Mon, 18 May 2015 10:53:22 -0400
parents adfa37e67084
children f9ef86cf22b2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
125
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
1 /*
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
2 * chase.c - Code for one object to chase another
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
3 *
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
4 * Advanced Rogue
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
5 * Copyright (C) 1984, 1985, 1986 Michael Morgan, Ken Dalka and AT&T
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
6 * All rights reserved.
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
7 *
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
8 * Based on "Rogue: Exploring the Dungeons of Doom"
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
9 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
10 * All rights reserved.
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
11 *
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
12 * See the file LICENSE.TXT for full copyright and licensing information.
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
13 */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
14
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
15 /*
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
16 * Code for one object to chase another
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
17 *
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
18 */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
19
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
20 #include <ctype.h>
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
21 #include <limits.h>
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
22 #include "curses.h"
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
23 #include "rogue.h"
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
24 #define MAXINT INT_MAX
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
25 #define MININT INT_MIN
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
26
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
27
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
28 /*
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
29 * Canblink checks if the monster can teleport (blink). If so, it will
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
30 * try to blink the monster next to the player.
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
31 */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
32
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
33 bool
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
34 can_blink(tp)
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
35 register struct thing *tp;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
36 {
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
37 register int y, x, index=9;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
38 coord tryp; /* To hold the coordinates for use in diag_ok */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
39 bool spots[9], found_one=FALSE;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
40
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
41 /*
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
42 * First, can the monster even blink? And if so, there is only a 50%
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
43 * chance that it will do so. And it won't blink if it is running or
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
44 * held.
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
45 */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
46 if (off(*tp, CANBLINK) || (on(*tp, ISHELD)) ||
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
47 on(*tp, ISFLEE) ||
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
48 tp->t_action == A_FREEZE ||
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
49 (rnd(12) < 6)) return(FALSE);
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
50
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
51
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
52 /* Initialize the spots as illegal */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
53 do {
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
54 spots[--index] = FALSE;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
55 } while (index > 0);
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
56
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
57 /* Find a suitable spot next to the player */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
58 for (y=hero.y-1; y<hero.y+2; y++)
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
59 for (x=hero.x-1; x<hero.x+2; x++, index++) {
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
60 /* Make sure x coordinate is in range and that we are
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
61 * not at the player's position
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
62 */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
63 if (x<0 || x >= cols || index == 4) continue;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
64
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
65 /* Is it OK to move there? */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
66 if (step_ok(y, x, NOMONST, tp) &&
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
67 (!isatrap(mvwinch(cw, y, x)) ||
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
68 rnd(10) >= tp->t_stats.s_intel ||
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
69 on(*tp, ISFLY))) {
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
70 /* OK, we can go here. But don't go there if
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
71 * monster can't get at player from there
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
72 */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
73 tryp.y = y;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
74 tryp.x = x;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
75 if (diag_ok(&tryp, &hero, tp)) {
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
76 spots[index] = TRUE;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
77 found_one = TRUE;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
78 }
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
79 }
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
80 }
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
81
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
82 /* If we found one, go to it */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
83 if (found_one) {
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
84 char rch; /* What's really where the creatures moves to */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
85
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
86 /* Find a legal spot */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
87 while (spots[index=rnd(9)] == FALSE) continue;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
88
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
89 /* Get the coordinates */
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
90 y = hero.y + (index/3) - 1;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
91 x = hero.x + (index % 3) - 1;
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
diff changeset
92
adfa37e67084 Import Advanced Rogue 7.7 from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards