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net: buf: Add net_buf_add_mem() API

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A very common pattern in code goes something like the following:

	memcpy(net_buf_add(buf, len), data, len);

To avoid having to create this kind of complex constructions every
time, this patch adds a new API which simplifies the call:

	net_buf_add_mem(buf, data, len);

Change-Id: Ic1aeae4baf88b2295d139f672d5d265db2ddbe7b
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Johan Hedberg 2016-12-22 22:42:47 +02:00 • committed by Anas Nashif
commit db8a5d9b80
2 changed files with 39 additions and 0 deletions
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31
include/net/buf.h
View file

@ -112,6 +112,21 @@ static inline void net_buf_simple_init(struct net_buf_simple *buf,
*/ */
void *net_buf_simple_add(struct net_buf_simple *buf, size_t len); void *net_buf_simple_add(struct net_buf_simple *buf, size_t len);
/**
* @brief Copy bytes from memory to the end of the buffer
*
* Copies the given number of bytes to the end of the buffer. Increments the
* data length of the buffer to account for more data at the end.
*
* @param buf Buffer to update.
* @param mem Location of data to be added.
* @param len Length of data to be added
*
* @return The original tail of the buffer.
*/
void *net_buf_simple_add_mem(struct net_buf_simple *buf, const void *mem,
size_t len);
/** /**
* @brief Add (8-bit) byte at the end of the buffer * @brief Add (8-bit) byte at the end of the buffer
* *
@ -645,6 +660,22 @@ static inline void *net_buf_user_data(struct net_buf *buf)
*/ */
#define net_buf_add(buf, len) net_buf_simple_add(&(buf)->b, len) #define net_buf_add(buf, len) net_buf_simple_add(&(buf)->b, len)
/**
* @def net_buf_add_mem
* @brief Copy bytes from memory to the end of the buffer
*
* Copies the given number of bytes to the end of the buffer. Increments the
* data length of the buffer to account for more data at the end.
*
* @param buf Buffer to update.
* @param mem Location of data to be added.
* @param len Length of data to be added
*
* @return The original tail of the buffer.
*/
#define net_buf_add_mem(buf, mem, len) net_buf_simple_add_mem(&(buf)->b, \
mem, len)
/** /**
* @def net_buf_add_u8 * @def net_buf_add_u8
* @brief Add (8-bit) byte at the end of the buffer * @brief Add (8-bit) byte at the end of the buffer

8
subsys/net/buf.c
View file

@ -350,6 +350,14 @@ void *net_buf_simple_add(struct net_buf_simple *buf, size_t len)
return tail; return tail;
} }
void *net_buf_simple_add_mem(struct net_buf_simple *buf, const void *mem,
size_t len)
{
NET_BUF_SIMPLE_DBG("buf %p len %zu", buf, len);
return memcpy(net_buf_simple_add(buf, len), mem, len);
}
uint8_t *net_buf_simple_add_u8(struct net_buf_simple *buf, uint8_t val) uint8_t *net_buf_simple_add_u8(struct net_buf_simple *buf, uint8_t val)
{ {
uint8_t *u8; uint8_t *u8;