X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcfg%2Fmacros.h;h=abf2057d5308d43d56593d60d0d8ed2c642ac5c4;hb=5d5cb6250eacac50a8a587296e109c787764f5b8;hp=69c404851c14b107709b3e7f8e3bfe6ac66049dc;hpb=0eeba5822b3ff0e76ae0fd0272536d371d272d7d;p=bertos.git

diff --git a/bertos/cfg/macros.h b/bertos/cfg/macros.h
index 69c40485..abf2057d 100644
--- a/bertos/cfg/macros.h
+++ b/bertos/cfg/macros.h
@@ -126,6 +126,19 @@
 
 #endif /* COMPILER_TYPEOF */
 
+/**
+ * Shuffle the content of \a array that counts \a len elements.
+ */
+#define SHUFFLE(array, len) \
+	do { \
+		int i, j; \
+		for (i = (len) - 1; i > 0; i--) \
+		{ \
+			j = ((i + 1) * (rand() / (RAND_MAX + 1.0))); \
+			SWAP((array)[i], (array)[j]); \
+		} \
+	} while (0)
+
 /**
  * Macro to swap \a a with \a b, with explicit type \a T for dumb C89 compilers.
  *