Q: Does C have circular shift operators?
A: No. (Part of the reason why is that the sizes of C's types aren't precisely defined--see question 1.2--but a circular shift makes most sense when applied to a word of a particular known size.)
You can implement a circular shift using two regular shifts and a bitwise OR:
(x << 13) | (x >> 3) /* circular shift left 13 in 16 bits */
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