http://ftp.aanet.ru/pub/Linux/X11/apps/xscreensaver-2.31.tar.gz

[xscreensaver] / utils / yarandom.h

diff --git a/utils/yarandom.h b/utils/yarandom.h
index 53b22fd88d0196d886da4cf270a7fcca65206bbb..a77e34bfe7ddade1763bc4bea2fe88d9ef600a4c 100644 (file)
--- a/utils/yarandom.h
+++ b/utils/yarandom.h
@@ -1,19 +1,52 @@
+/* xscreensaver, Copyright (c) 1997 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__
+
 #undef random
 #undef rand
 #undef drand48
 #undef srandom
 #undef srand
 #undef srand48
+#undef frand
+
+#ifdef VMS
+# include "vms-gtod.h"
+#endif
 
 #define random()   ya_random()
 #define srandom(i) ya_rand_init(0)
 
-#undef P
-#if __STDC__
-# define P(x)x
-#else
-# define P(x)()
-#endif
+extern unsigned int ya_random (void);
+extern void ya_rand_init (unsigned int);
+
+
+#if defined (__GNUC__) && (__GNUC__ >= 2)
+ /* Implement frand using GCC's statement-expression extension. */
+
+# define frand(f)                                                      \
+  ({ double tmp = (((double) random()) /                               \
+                  (((double) ((unsigned int)~0)) / ((double) (f))));   \
+     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) ((unsigned int)~0)) / ((double) (f)))),    \
+   _frand_tmp_ < 0 ? (-_frand_tmp_) : _frand_tmp_)
+
+#endif /* not GCC2 */
 
-extern unsigned int ya_random P((void));
-extern void ya_rand_init P((unsigned int));
+#endif /* __YARANDOM_H__ */