1 files changed, 14 insertions, 0 deletions
diff --git a/lib/libc/strings/ffsl.c b/lib/libc/strings/ffsl.c
new file mode 100644
index 00000000..2f2e7d44
--- /dev/null
+++ b/lib/libc/strings/ffsl.c
@@ -0,0 +1,14 @@
+int ffsl(long i)
+{
+	if (i == 0)
+		return 0;
+
+	int pos = 1;
+	unsigned long u = (unsigned long)i;
+
+	while ((u & 1UL) == 0UL) {
+		u >>= 1;
+		pos++;
+	}
+	return pos;
+}