1 files changed, 14 insertions, 0 deletions
diff --git a/util.c b/util.c
index 2232a24..bfeb619 100644
--- a/util.c
+++ b/util.c
@@ -614,6 +614,9 @@ int __daemon(int pidfile_fd, int devnull_fd)
  * fls() - Find last (most significant) bit set in word
  * @x:		Word
  *
+ * Note: unlike ffs() and other implementations of fls(), notably the one from
+ * the Linux kernel, the starting position is 0 and not 1, that is, fls(1) = 0.
+ *
  * Return: position of most significant bit set, starting from 0, -1 if none
  */
 int fls(unsigned long x)
@@ -630,6 +633,17 @@ int fls(unsigned long x)
 }
 
 /**
+ * ilog2() - Integral part (floor) of binary logarithm (logarithm to the base 2)
+ * @x:		Argument
+ *
+ * Return: integral part of binary logarithm of @x, -1 if undefined (if @x is 0)
+ */
+int ilog2(unsigned long x)
+{
+	return fls(x);
+}
+
+/**
  * write_file() - Replace contents of file with a string
  * @path:	File to write
  * @buf:	String to write