does potts now, no external libraries

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/rand.c b/lib/rand.c
new file mode 100644
index 0000000..76f537d
--- /dev/null
+++ b/lib/rand.c
@@ -0,0 +1,20 @@
+
+#include <assert.h>
+#include <stdio.h>
+
+unsigned long int rand_seed() {
+  /*
+    returns a random unsigned long integer read from the standard unix
+    pseudorandom device /dev/urandom
+  */
+
+  FILE *f = fopen("/dev/urandom", "r");
+  assert(f != NULL);
+
+  unsigned long int seed;
+  fread(&seed, sizeof(unsigned long int), 1, f);
+
+  fclose(f);
+
+  return seed;
+}