#include "lwip/opt.h"
#include "lwip/stats.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/memp.h"
#include "lwip/pbuf.h"
#include "lwip/sys.h"
#include <string.h>

Include dependency graph for pbuf.c:

Macros
#define	SIZEOF_STRUCT_PBUF LWIP_MEM_ALIGN_SIZE(sizeof(struct pbuf))

#define	PBUF_POOL_BUFSIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(PBUF_POOL_BUFSIZE)

#define	PBUF_POOL_IS_EMPTY()

Functions
struct pbuf *	pbuf_alloc (pbuf_layer layer, u16_t length, pbuf_type type)

void	pbuf_realloc (struct pbuf *p, u16_t new_len)

u8_t	pbuf_header (struct pbuf *p, s16_t header_size_increment)

u8_t	pbuf_header_force (struct pbuf *p, s16_t header_size_increment)

u8_t	pbuf_free (struct pbuf *p)

u16_t	pbuf_clen (const struct pbuf *p)

void	pbuf_ref (struct pbuf *p)

void	pbuf_cat (struct pbuf h, struct pbuf t)

void	pbuf_chain (struct pbuf h, struct pbuf t)

struct pbuf *	pbuf_dechain (struct pbuf *p)

err_t	pbuf_copy (struct pbuf p_to, const struct pbuf p_from)

u16_t	pbuf_copy_partial (const struct pbuf buf, void dataptr, u16_t len, u16_t offset)

struct pbuf *	pbuf_skip (struct pbuf in, u16_t in_offset, u16_t out_offset)

err_t	pbuf_take (struct pbuf buf, const void dataptr, u16_t len)

err_t	pbuf_take_at (struct pbuf buf, const void dataptr, u16_t len, u16_t offset)

struct pbuf *	pbuf_coalesce (struct pbuf *p, pbuf_layer layer)

u8_t	pbuf_get_at (const struct pbuf *p, u16_t offset)

int	pbuf_try_get_at (const struct pbuf *p, u16_t offset)

void	pbuf_put_at (struct pbuf *p, u16_t offset, u8_t data)

u16_t	pbuf_memcmp (const struct pbuf p, u16_t offset, const void s2, u16_t n)

u16_t	pbuf_memfind (const struct pbuf p, const void mem, u16_t mem_len, u16_t start_offset)

u16_t	pbuf_strstr (const struct pbuf p, const char substr)

Detailed Description

Packet buffer management

Definition in file pbuf.c.

Function Documentation

u16_t pbuf_clen ( const struct pbuf * p )

Count number of pbufs in a chain

Parameters

p	first pbuf of chain

Returns: the number of pbufs in a chain

Definition at line 819 of file pbuf.c.

References pbuf::next.

Referenced by netif_set_link_down().

Here is the caller graph for this function:

struct pbuf* pbuf_dechain ( struct pbuf * p )

Dechains the first pbuf from its succeeding pbufs in the chain.

Makes p->tot_len field equal to p->len.

Parameters

p	pbuf to dechain

Returns: remainder of the pbuf chain, or NULL if it was de-allocated.

Note: May not be called on a packet queue.

Definition at line 918 of file pbuf.c.

References pbuf::len, LWIP_DBG_TRACE, LWIP_DEBUGF, pbuf::next, PBUF_DEBUG, pbuf_free(), and pbuf::tot_len.

u8_t pbuf_header	(	struct pbuf *	p,
		s16_t	header_size_increment
	)

Adjusts the payload pointer to hide or reveal headers in the payload.

Adjusts the ->payload pointer so that space for a header (dis)appears in the pbuf payload.

The ->payload, ->tot_len and ->len fields are adjusted.

Parameters

p	pbuf to change the header size.
header_size_increment	Number of bytes to increment header size which increases the size of the pbuf. New space is on the front. (Using a negative value decreases the header size.) If hdr_size_inc is 0, this function does nothing and returns successful.

PBUF_ROM and PBUF_REF type buffers cannot have their sizes increased, so the call will fail. A check is made that the increase in header size does not move the payload pointer in front of the start of the buffer.

Returns: non-zero on failure, zero on success.

Definition at line 684 of file pbuf.c.

u8_t pbuf_header_force	(	struct pbuf *	p,
		s16_t	header_size_increment
	)

Same as pbuf_header but does not check if 'header_size > 0' is allowed. This is used internally only, to allow PBUF_REF for RX.

Definition at line 694 of file pbuf.c.

u16_t pbuf_strstr	(	const struct pbuf *	p,
		const char *	substr
	)

Find occurrence of substr with length substr_len in pbuf p, start at offset start_offset WARNING: in contrast to strstr(), this one does not stop at the first \0 in the pbuf/source string!

Parameters

p	pbuf to search, maximum length is 0xFFFE since 0xFFFF is used as return value 'not found'
substr	string to search for in p, maximum length is 0xFFFE

Returns: 0xFFFF if substr was not found in p or the index where it was found

Definition at line 1450 of file pbuf.c.

References pbuf_memfind(), and pbuf::tot_len.

Macros

Functions

Detailed Description

Function Documentation