Fix mingw ID randomness from 8 to 16 bits.

git-svn-id: file:///svn/unbound/trunk@1717 be551aaa-1e26-0410-a405-d3ace91eadb9

doc/Changelog

@@ -2,6 +2,8 @@
 	- Fix for crash at start on windows.
 	- tag for release 1.3.2.
 	- trunk has version 1.3.3.
+	- Fix for ID bits on windows to use all 16. RAND_MAX was not
+ 	  defined like you'd expect on mingw.
 
 9 July 2009: Wouter
 	- tag for release 1.3.1.

util/random.c

@@ -78,6 +78,12 @@ struct ub_randstate {
 /** Size of key to use */
 #define SEED_SIZE 20
 
+/** 
+ * Max random value.  Similar to RAND_MAX, but more portable
+ * (mingw uses only 15 bits random).
+ */
+#define MAX_VALUE 0x7fffffff
+
 /** Number of bytes to reseed after */
 #define REKEY_BYTES	(1 << 24)
 
@@ -168,7 +174,7 @@ ub_random(struct ub_randstate* s)
 	RC4(&s->rc4, sizeof(r), 
 		(unsigned char *)&r, (unsigned char *)&r);
 	s->rc4_ready -= sizeof(r);
-	return (long int)((r) % (((unsigned)RAND_MAX + 1)));
+	return (long int)((r) % (((unsigned)MAX_VALUE + 1)));
 }
 
 void