File libxslt-random-seed.patch of Package libxslt

commit 047a0fd99e64c554c4edf44cc67ee765b09af017
Author: Marcus Meissner <meissner@suse.de>
Date:   Tue Apr 4 16:27:39 2017 +0200

    initialize the random seed

Index: libxslt-v1.1.36/libexslt/math.c
===================================================================
--- libxslt-v1.1.36.orig/libexslt/math.c
+++ libxslt-v1.1.36/libexslt/math.c
@@ -12,6 +12,12 @@
 #include <math.h>
 #include <stdlib.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <time.h>
+
 #include "exslt.h"
 
 /**
@@ -460,6 +468,20 @@ static double
 exsltMathRandom (void) {
     double ret;
     int num;
+    long seed;
+    static int randinit = 0;
+
+    if (!randinit) {
+	int fd = open("/dev/urandom",O_RDONLY);
+
+	seed = time(NULL); /* just in case /dev/urandom is not there */
+	if (fd != -1) {
+		read (fd, &seed, sizeof(seed));
+		close (fd);
+	}
+	srand(seed);
+	randinit = 1;
+    }
 
     num = rand();
     ret = (double)num / (double)RAND_MAX;