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[2/3] Add left circular shift function

Message ID 1401901663-16418-2-git-send-email-Max.Suraev@fairwaves.co
State Accepted, archived
Headers show

Commit Message

Max June 4, 2014, 5:07 p.m. UTC 
---
 include/osmocom/core/bits.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/include/osmocom/core/bits.h b/include/osmocom/core/bits.h
index 5c9c7a6..c2c4863 100644
--- a/include/osmocom/core/bits.h
+++ b/include/osmocom/core/bits.h
@@ -78,6 +78,16 @@  uint32_t osmo_revbytebits_8(uint8_t x);
 /* \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));
+}
+
 /*! @} */
 
 #endif /* _OSMO_BITS_H */