bits: Add left circular shift function
Submitted-by: Max <max.suraev@fairwaves.co>
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/include/osmocom/core/bits.h b/include/osmocom/core/bits.h
index f3045e4..1587b05 100644
--- a/include/osmocom/core/bits.h
+++ b/include/osmocom/core/bits.h
@@ -77,4 +77,14 @@
/* \brief reverse the bits of each byte in a given buffer */
void osmo_revbytebits_buf(uint8_t *buf, int len);
+/*! \brief left circular shift
+ * \param[in] in The 16 bit unsigned integer to be rotated
+ * \param[in] shift Number of bits to shift \a in to, [0;16] bits
+ * \returns shifted value
+ */
+static inline uint16_t osmo_rol16(uint16_t in, unsigned shift)
+{
+ return (in << shift) | (in >> (16 - shift));
+}
+
/*! @} */