+/* xscreensaver, Copyright (c) 1997, 1998, 2003 by Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation. No representations are made about the suitability of this
+ * software for any purpose. It is provided "as is" without express or
+ * implied warranty.
+ */
+
+#ifndef __YARANDOM_H__
+#define __YARANDOM_H__
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
+
#undef random
#undef rand
#undef drand48
#undef srandom
#undef srand
#undef srand48
+#undef frand
+#undef RAND_MAX
+
+#ifdef VMS
+# include "vms-gtod.h"
+#endif
+
+extern unsigned int ya_random (void);
+extern void ya_rand_init (unsigned int);
#define random() ya_random()
-#define srandom(i) ya_rand_init(0)
+#define RAND_MAX 0xFFFFFFFF
+
+/*#define srandom(i) ya_rand_init(0)*/
-#undef P
-#if __STDC__
-# define P(x)x
+/* Define these away to keep people from using the wrong APIs in xscreensaver.
+ */
+#define rand __ERROR_use_random_not_rand_in_xscreensaver__
+#define drand48 __ERROR_use_frand_not_drand48_in_xscreensaver__
+#define srandom __ERROR_do_not_call_srandom_in_xscreensaver__
+#define srand __ERROR_do_not_call_srand_in_xscreensaver__
+#define srand48 __ERROR_do_not_call_srand48_in_xscreensaver__
+#define ya_rand_init __ERROR_do_not_call_ya_rand_init_in_xscreensaver__
+
+
+#if defined (__GNUC__) && (__GNUC__ >= 2)
+ /* Implement frand using GCC's statement-expression extension. */
+
+# define frand(f) \
+ __extension__ \
+ ({ double tmp = ((((double) random()) * ((double) (f))) / \
+ ((double) ((unsigned int)~0))); \
+ tmp < 0 ? (-tmp) : tmp; })
+
+#else /* not GCC2 - implement frand using a global variable.*/
+
+static double _frand_tmp_;
+# define frand(f) \
+ (_frand_tmp_ = ((((double) random()) * ((double) (f))) / \
+ ((double) ((unsigned int)~0))), \
+ _frand_tmp_ < 0 ? (-_frand_tmp_) : _frand_tmp_)
+
+#endif /* not GCC2 */
+
+/* Compatibility with the xlockmore RNG API
+ (note that the xlockmore hacks never expect negative numbers.)
+ */
+#define LRAND() ((long) (random() & 0x7fffffff))
+
+/* The first NRAND(n) is much faster, when uint64_t is available to allow it.
+ * Especially on ARM and other processors without built-in division.
+ *
+ * n must be greater than zero.
+ *
+ * The division by RAND_MAX+1 should optimize down to a bit shift.
+ *
+ * Although the result here is never negative, this needs to return signed
+ * integers: A binary operator in C requires operands have the same type, and
+ * if one side is signed and the other is unsigned, but they're both the same
+ * size, then the signed operand is cast to unsigned, and the result is
+ * similarly unsigned. This can potentially cause problems when idioms like
+ * "NRAND(n) * RANDSIGN()" (where RANDSIGN() returns either -1 or 1) is used
+ * to get random numbers from the range (-n,n).
+ */
+#ifdef HAVE_INTTYPES_H
+# define NRAND(n) ((int32_t) ((uint64_t) random() * (uint32_t) (n) / \
+ ((uint64_t) RAND_MAX + 1)))
#else
-# define P(x)()
+# define NRAND(n) ((int) (LRAND() % (n)))
#endif
-extern unsigned int ya_random P((void));
-extern void ya_rand_init P((unsigned int));
+#define MAXRAND (2147483648.0) /* unsigned 1<<31 as a float */
+#define SRAND(n) /* already seeded by screenhack.c */
+
+#endif /* __YARANDOM_H__ */
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