1 files changed, 20 insertions, 0 deletions
diff --git a/src/strings/ffs.c b/src/strings/ffs.c
new file mode 100644
index 00000000..7e29487d
--- /dev/null
+++ b/src/strings/ffs.c
@@ -0,0 +1,20 @@
+#include <strings.h>
+
+int ffs(int i)
+{
+	int bit = 0;
+
+	if (i == 0) {
+		return 0;
+	}
+
+	while (!(i & (1 << bit))) {
+		bit++;
+	}
+
+	return bit;
+}
+
+/*
+XOPEN(400)
+*/