added slstatus

slstatus/components/entropy.c

@@ -0,0 +1,29 @@
+/* See LICENSE file for copyright and license details. */
+#include "../slstatus.h"
+#if defined(__linux__)
+	#include <stdint.h>
+	#include <stdio.h>
+
+	#include "../util.h"
+
+	#define ENTROPY_AVAIL "/proc/sys/kernel/random/entropy_avail"
+
+	const char *
+	entropy(const char *unused)
+	{
+		uintmax_t num;
+
+		if (pscanf(ENTROPY_AVAIL, "%ju", &num) != 1)
+			return NULL;
+
+		return bprintf("%ju", num);
+	}
+#elif defined(__OpenBSD__) | defined(__FreeBSD__)
+	const char *
+	entropy(const char *unused)
+	{
+		// https://www.unicode.org/charts/PDF/U2200.pdf
+		/* Unicode Character 'INFINITY' (U+221E) */
+		return "\u221E";
+	}
+#endif