initial commit

1 files changed, 42 insertions, 0 deletions

diff --git a/randgen_unix.c b/randgen_unix.c
new file mode 100644
index 0000000..f7d12bb
--- /dev/null
+++ b/randgen_unix.c
@@ -0,0 +1,42 @@
+#include "randgen.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+struct randgen *randgen_open(const char *device)
+{
+    const char *filename = "/dev/urandom";
+    FILE *fp;
+
+    if (device)
+        filename = device;
+
+    if ((fp = fopen(filename, "r")) == NULL)
+    {
+        fprintf(stderr, "failed to open random generator (%s): %s\n", filename, strerror(errno));
+        return NULL;
+    }
+
+    return (struct randgen *) fp;
+}
+
+int randgen_close(struct randgen *randgen)
+{
+    assert(randgen != NULL);
+    fclose((FILE *) randgen);
+    return 0;
+}
+
+int randgen_generate(struct randgen *randgen, void *buf, size_t size)
+{
+    assert(randgen != NULL);
+    assert(buf != NULL);
+    assert(size > 0);
+
+    if (fread(buf, 1, size, (FILE *) randgen) != size)
+        return -1;
+
+    return 0;
+}