first commit

1 files changed, 27 insertions, 0 deletions

diff --git a/components/entropy.c b/components/entropy.c
new file mode 100644
index 0000000..2a485de
--- /dev/null
+++ b/components/entropy.c
@@ -0,0 +1,27 @@
+/* See LICENSE file for copyright and license details. */
+#if defined(__linux__)
+	#include <stdint.h>
+	#include <stdio.h>
+
+	#include "../util.h"
+
+	const char *
+	entropy(void)
+	{
+		uintmax_t num;
+
+		if (pscanf("/proc/sys/kernel/random/entropy_avail", "%ju", &num)
+		    != 1) {
+			return NULL;
+		}
+
+		return bprintf("%ju", num);
+	}
+#elif defined(__OpenBSD__) | defined(__FreeBSD__)
+	const char *
+	entropy(void)
+	{
+		/* Unicode Character 'INFINITY' (U+221E) */
+		return "\xe2\x88\x9e";
+	}
+#endif