Split random number generation out into core/random.c, and create the

correct prototypes for srandom(), rand() and srand().

2 files changed, 38 insertions, 18 deletions

diff --git a/src/core/misc.c b/src/core/misc.c
index e150709a1..e214a6284 100644
--- a/src/core/misc.c
+++ b/src/core/misc.c
@@ -55,24 +55,6 @@ uint16_t add_ipchksums(unsigned long offset, uint16_t sum, uint16_t new)
 	return (~checksum) & 0xFFFF;
 }
 
-
-
-/**************************************************************************
-RANDOM - compute a random number between 0 and 2147483647L or 2147483562?
-**************************************************************************/
-long int random(void)
-{
-	static int32_t seed = 0;
-	int32_t q;
-	if (!seed) /* Initialize linear congruential generator */
-		seed = currticks();
-	/* simplified version of the LCG given in Bruce Schneier's
-	   "Applied Cryptography" */
-	q = seed/53668;
-	if ((seed = 40014*(seed-53668*q) - 12211*q) < 0) seed += 2147483563L;
-	return seed;
-}
-
 /**************************************************************************
 SLEEP
 **************************************************************************/
diff --git a/src/core/random.c b/src/core/random.c
new file mode 100644
index 000000000..c15bb6de3
--- /dev/null
+++ b/src/core/random.c
@@ -0,0 +1,38 @@
+/** @file
+ *
+ * Random number generation
+ *
+ */
+
+#include <stdlib.h>
+
+static int32_t rnd_seed = 0;
+
+/**
+ * Seed the pseudo-random number generator
+ *
+ * @v seed		Seed value
+ */
+void srandom ( unsigned int seed ) {
+	rnd_seed = seed;
+}
+
+/**
+ * Generate a pseudo-random number between 0 and 2147483647L or 2147483562?
+ *
+ * @ret rand		Pseudo-random number
+ */
+long int random ( void ) {
+	int32_t q;
+
+	if ( ! rnd_seed ) /* Initialize linear congruential generator */
+		srandom ( currticks() );
+
+	/* simplified version of the LCG given in Bruce Schneier's
+	   "Applied Cryptography" */
+	q = ( rnd_seed / 53668 );
+	rnd_seed = ( 40014 * ( rnd_seed - 53668 * q ) - 12211 * q );
+	if ( rnd_seed < 0 )
+		rnd_seed += 2147483563L;
+	return rnd_seed;
+}