- Introduce seeding of the random number generator at startup

- Replaced all engine-side occurances of rand() with random()


git-svn-id: svn://svn.icculus.org/quake3/trunk@1561 edf5b092-35ff-0310-97b2-ce42778d08ea

1 files changed, 22 insertions, 4 deletions

diff --git a/code/qcommon/common.c b/code/qcommon/common.c
index e8a95a5..0f28072 100644
--- a/code/qcommon/common.c
+++ b/code/qcommon/common.c
@@ -2502,6 +2502,22 @@ static void Com_DetectAltivec(void)
 
 /*
 =================
+Com_InitRand
+Seed the random number generator, if possible with an OS supplied random seed.
+=================
+*/
+static void Com_InitRand(void)
+{
+	unsigned int seed;
+	
+	if(Sys_Random(&seed, sizeof(seed)))
+		srand(seed);
+	else
+		srand(time(NULL));
+}
+
+/*
+=================
 Com_Init
 =================
 */
@@ -2519,8 +2535,11 @@ void Com_Init( char *commandLine ) {
 	Com_Memset( &eventQueue[ 0 ], 0, MAX_QUEUED_EVENTS * sizeof( sysEvent_t ) );
 	Com_Memset( &sys_packetReceived[ 0 ], 0, MAX_MSGLEN * sizeof( byte ) );
 
-  // do this before anything else decides to push events
-  Com_InitPushEvent();
+	// initialize the weak pseudo-random number generator for use later.
+	Com_InitRand();
+
+	// do this before anything else decides to push events
+	Com_InitPushEvent();
 
 	Com_InitSmallZoneMemory();
 	Cvar_Init ();
@@ -3322,8 +3341,7 @@ void Com_RandomBytes( byte *string, int len )
 		return;
 
 	Com_Printf( "Com_RandomBytes: using weak randomization\n" );
-	srand( time( 0 ) );
 	for( i = 0; i < len; i++ )
-		string[i] = (unsigned char)( rand() % 255 );
+		string[i] = (unsigned char)( random() % 255 );
 }