RSeq Header [SIP Headers]

The RSeq header identifies provisional responses within a transaction. More...

Data Structures
struct	sip_rseq_s
	Structure for RSeq header. More...
Defines
#define	sip_rseq(sip)
	Access a SIP RSeq header structure sip_rseq_t from sip_t.
#define	SIP_RSEQ_INIT()
	Initializer for structure sip_rseq_t.
#define	SIPTAG_RSEQ(x)
	Tag list item for pointer to a RSeq header structure sip_rseq_t.
#define	SIPTAG_RSEQ_REF(x)
	Tag list item for reference to a RSeq header pointer.
#define	SIPTAG_RSEQ_STR(s)
	Tag list item for string with RSeq header value.
#define	SIPTAG_RSEQ_STR_REF(x)
	Tag list item for reference to a RSeq header string.
Typedefs
typedef struct sip_rseq_s	sip_rseq_t
	The structure sip_rseq_t contains representation of an RSeq header.
Functions
issize_t	sip_rseq_d (su_home_t *, msg_header_t *, char *s, isize_t slen)
	Parse a SIP RSeq header.
issize_t	sip_rseq_e (char b[], isize_t bsiz, msg_header_t const *h, int flags)
	Print a SIP RSeq header.
sip_rseq_t *	sip_rseq_init (sip_rseq_t x[1])
	Initialize a structure sip_rseq_t.
int	sip_is_rseq (sip_header_t const *header)
	Test if header object is instance of sip_rseq_t.
sip_rseq_t *	sip_rseq_dup (su_home_t *home, sip_rseq_t const *hdr))
	Duplicate a list of RSeq header header structures sip_rseq_t.
sip_rseq_t *	sip_rseq_copy (su_home_t *home, sip_rseq_t const *hdr))
	Copy a list of RSeq header header structures sip_rseq_t.
sip_rseq_t *	sip_rseq_make (su_home_t *home, char const *s))
	Make a RSeq header structure sip_rseq_t.
sip_rseq_t *	sip_rseq_format (su_home_t *home, char const *fmt,...)))
	Make a RSeq header from formatting result.
Variables
msg_hclass_t	sip_rseq_class []
	Header class for RSeq header.
tag_typedef_t	siptag_rseq
	Tag for RSeq header object.
tag_typedef_t	siptag_rseq_str
	Tag for string with RSeq header value.

---

Detailed Description

The RSeq header identifies provisional responses within a transaction.

Its syntax is defined in RFC 3262 section 10 as follows:

    RSeq          =  "RSeq" HCOLON response-num
    response-num  =  1*DIGIT

The parsed RSeq header is stored in sip_rseq_t structure.

---

Define Documentation

#define SIP_RSEQ_INIT

(

)

Initializer for structure sip_rseq_t.

A static sip_rseq_t structure for RSeq header must be initialized with the SIP_RSEQ_INIT() macro. For instance,

  sip_rseq_t sip_rseq = SIP_RSEQ_INIT;

#define SIPTAG_RSEQ

(

x

)

Tag list item for pointer to a RSeq header structure sip_rseq_t.

The SIPTAG_RSEQ() macro is used to include a tag item with a pointer to a sip_rseq_t structure in a tag list.

Parameters:

x

pointer to a sip_rseq_t structure, or NULL.

The corresponding tag taking reference parameter is SIPTAG_RSEQ_REF().

#define SIPTAG_RSEQ_STR

(

s

)

Tag list item for string with RSeq header value.

The SIPTAG_RSEQ_STR() macro is used to include a tag item with a string containing value of a sip_rseq_t header in a tag list.

Parameters:

s

pointer to a string containing RSeq header value, or NULL.

The string in SIPTAG_RSEQ_STR() can be converted to a sip_rseq_t header structure by giving the string s has second argument to function sip_rseq_make().

The corresponding tag taking reference parameter is SIPTAG_RSEQ_STR_REF().

---

Typedef Documentation

struct sip_rseq_s sip_rseq_t

The structure sip_rseq_t contains representation of an RSeq header.

The sip_rseq_t is defined as follows:

 typedef struct sip_rseq_s
 {
   sip_common_t        rs_common;        // Common fragment info
   sip_error_t        *rs_next;          // Dummy link to next
   uint32_t            rs_response;      // Sequence number of response
 } sip_rseq_t;

---

Function Documentation

int sip_is_rseq

(

sip_header_t const *

header

)

[inline]

Test if header object is instance of sip_rseq_t.

Check if the header class is an instance of RSeq header object and return true (nonzero), otherwise return false (zero).

Parameters:

header

pointer to the header structure to be tested

Return values:

	1	(true) if the header is an instance of header rseq
	0	(false) otherwise

sip_rseq_t * sip_rseq_copy	(	su_home_t *	home,
		sip_rseq_t const *	hdr
	)			[inline]

Copy a list of RSeq header header structures sip_rseq_t.

The function sip_rseq_copy() copies a header structure hdr. If the header structure hdr contains a reference (hdr->h_next) to a list of headers, all the headers in that list are copied, too. The function uses given memory home to allocate all the memory areas used to copy the list of header structure hdr.

Parameters:

	home	memory home used to allocate new structure
	hdr	pointer to the header structure to be copied

When copying, only the header structure and parameter lists attached to it are duplicated. The new header structure retains all the references to the strings within the old hdr header, including the encoding of the old header, if present.

Example

   rseq = sip_rseq_copy(home, sip->sip_rseq);

Returns:

A pointer to newly copied header structure, or NULL upon an error.

sip_rseq_t * sip_rseq_dup	(	su_home_t *	home,
		sip_rseq_t const *	hdr
	)			[inline]

Duplicate a list of RSeq header header structures sip_rseq_t.

Duplicate a header structure hdr. If the header structure hdr contains a reference (hdr->x_next) to a list of headers, all the headers in the list are duplicated, too.

Parameters:

	home	memory home used to allocate new structure
	hdr	header structure to be duplicated

When duplicating, all parameter lists and non-constant strings attached to the header are copied, too. The function uses given memory home to allocate all the memory areas used to copy the header.

Example

   rseq = sip_rseq_dup(home, sip->sip_rseq);

Returns:

A pointer to the newly duplicated sip_rseq_t header structure, or NULL upon an error.

sip_rseq_t * sip_rseq_format	(	su_home_t *	home,
		char const *	fmt,
			...
	)			[inline]

Make a RSeq header from formatting result.

Make a new sip_rseq_t object using formatting result as its value. The function first prints the arguments according to the format fmt specified. Then it allocates a new header structure, and parses the formatting result to the structure sip_rseq_t.

Parameters:

	home	memory home used to allocate new header structure.
	fmt	string used as a printf()-style format
	...	argument list for format

Returns:

A pointer to newly makes header structure, or NULL upon an error.

sip_rseq_t* sip_rseq_init

(

sip_rseq_t

x[1]

)

[inline]

Initialize a structure sip_rseq_t.

An sip_rseq_t structure for RSeq header can be initialized with the sip_rseq_init() function/macro. For instance,

  sip_rseq_t sip_rseq;

  sip_rseq_init(&sip_rseq);

sip_rseq_t * sip_rseq_make	(	su_home_t *	home,
		char const *	s
	)			[inline]

Make a RSeq header structure sip_rseq_t.

The function sip_rseq_make() makes a new sip_rseq_t header structure. It allocates a new header structure, and decodes the string s as the value of the structure.

Parameters:

	home	memory home used to allocate new header structure.
	s	string to be decoded as value of the new header structure

Returns:

A pointer to newly maked sip_rseq_t header structure, or NULL upon an error.

---

Variable Documentation

msg_hclass_t sip_rseq_class[]

Header class for RSeq header.

The header class sip_rseq_class defines how a SIP RSeq header is parsed and printed. It also contains methods used by SIP parser and other functions to manipulate the sip_rseq_t header structure.