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net: buf: Add net_buf_simple_clone

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Provides a way to clone a net_buf_simple without altering the state of
the original buffer. The primary usage scenario is for manipulating a
previously allocated PDU inside a buffer without altering the length and
offset of the buffer.

Signed-off-by: Trond Einar Snekvik <Trond.Einar.Snekvik@nordicsemi.no>
This commit is contained in:
Trond Einar Snekvik 2019-10-01 13:37:10 +02:00 • committed by Johan Hedberg
commit 3d201b45f9
2 changed files with 19 additions and 0 deletions
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13
include/net/buf.h
View file

@ -153,6 +153,19 @@ static inline void net_buf_simple_reset(struct net_buf_simple *buf)
buf->data = buf->__buf;
}
/**
* Clone buffer state, using the same data buffer.
*
* Initializes a buffer to point to the same data as an existing buffer.
* Allows operations on the same data without altering the length and
* offset of the original.
*
* @param original Buffer to clone.
* @param clone The new clone.
*/
void net_buf_simple_clone(const struct net_buf_simple *original,
struct net_buf_simple *clone);
/**
* @brief Prepare data to be added at the end of the buffer
*

6
subsys/net/buf.c
View file

@ -760,6 +760,12 @@ size_t net_buf_append_bytes(struct net_buf *buf, size_t len,
#define NET_BUF_SIMPLE_ASSERT(cond)
#endif /* CONFIG_NET_BUF_SIMPLE_LOG */
void net_buf_simple_clone(const struct net_buf_simple *original,
struct net_buf_simple *clone)
{
memcpy(clone, original, sizeof(struct net_buf_simple));
}
void *net_buf_simple_add(struct net_buf_simple *buf, size_t len)
{
u8_t *tail = net_buf_simple_tail(buf);