Revert "Merge branch 'master' of git.osdn.net:/gitroot/hengband/hengband"

[hengband/hengband.git] / src / z-rand.h

diff --git a/src/z-rand.h b/src/z-rand.h
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+/* File: z-rand.h */
+
+/*
+ * Copyright (c) 1997 Ben Harrison, and others
+ *
+ * This software may be copied and distributed for educational, research,
+ * and not for profit purposes provided that this copyright and statement
+ * are included in all such copies.  Other copyrights may also apply.
+ */
+
+
+#ifndef INCLUDED_Z_RAND_H
+#define INCLUDED_Z_RAND_H
+
+#include "h-basic.h"
+
+
+
+/**** Available constants ****/
+
+
+/*
+ * Random Number Generator -- Degree of "complex" RNG -- see "misc.c"
+ * This value is hard-coded at 63 for a wide variety of reasons.
+ */
+#define RAND_DEG 63
+
+
+
+
+/**** Available macros ****/
+
+
+/*
+ * Generates a random long integer X where O<=X<M.
+ * The integer X falls along a uniform distribution.
+ * For example, if M is 100, you get "percentile dice"
+ */
+#define randint0(M) \
+       ((s32b)Rand_div(M))
+
+/*
+ * Generates a random long integer X where A<=X<=B
+ * The integer X falls along a uniform distribution.
+ * Note: rand_range(0,N-1) == randint0(N)
+ */
+#define rand_range(A,B) \
+       ((A) + (randint0(1+(B)-(A))))
+
+/*
+ * Generate a random long integer X where A-D<=X<=A+D
+ * The integer X falls along a uniform distribution.
+ * Note: rand_spread(A,D) == rand_range(A-D,A+D)
+ */
+#define rand_spread(A,D) \
+       ((A) + (randint0(1+(D)+(D))) - (D))
+
+
+/*
+ * Generate a random long integer X where 1<=X<=M
+ * Also, "correctly" handle the case of M<=1
+ */
+#define randint1(M) \
+       (randint0(M) + 1)
+
+
+/*
+ * Evaluate to TRUE "P" percent of the time
+ */
+#define magik(P) \
+       (randint0(100) < (P))
+
+
+#define one_in_(X) \
+       (randint0(X) == 0)
+
+/*
+ * Evaluate to TRUE "S" percent of the time
+ */
+#define saving_throw(S) \
+       (randint0(100) < (S))
+
+
+/**** Available Variables ****/
+
+extern u16b Rand_place;
+extern u32b Rand_state[RAND_DEG];
+
+
+/**** Available Functions ****/
+
+extern void Rand_state_init(void);
+extern void Rand_state_set(u32b seed);
+extern void Rand_state_backup(u32b* backup_state);
+extern void Rand_state_restore(u32b* backup_state);
+extern s32b Rand_div(s32b m);
+extern s16b randnor(int mean, int stand);
+extern s16b damroll(int num, DICE_SID sides);
+extern s16b maxroll(int num, DICE_SID sides);
+extern s32b div_round(s32b n, s32b d);
+extern s32b Rand_external(s32b m);
+
+
+#endif
+
+