uuid_dec_le(3) manual page

Manual Pages — UUID

NAME

uuid_compare, uuid_from_string – DCE 1.1 compliant UUID functions

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <uuid.h>

int32_t
uuid_compare(const uuid_t *uuid1, const uuid_t *uuid2, uint32_t *status);

void
uuid_create(uuid_t *uuid, uint32_t *status);

void
uuid_create_nil(uuid_t *uuid, uint32_t *status);

int32_t
uuid_equal(const uuid_t *uuid1, const uuid_t *uuid2, uint32_t *status);

void
uuid_from_string(const char *str, uuid_t *uuid, uint32_t *status);

uint16_t
uuid_hash(const uuid_t *uuid, uint32_t *status);

int32_t
uuid_is_nil(const uuid_t *uuid, uint32_t *status);

void
uuid_to_string(const uuid_t *uuid, char **str, uint32_t *status);

void
uuid_enc_le(void *buf, const uuid_t *uuid);

void
uuid_dec_le(const void *buf, uuid_t *);

void
uuid_enc_be(void *buf, const uuid_t *uuid);

void
uuid_dec_be(const void *buf, uuid_t *);

DESCRIPTION

The family of DCE 1.1 compliant UUID functions allow applications to operate on universally unique identifiers, or UUIDs. The uuid_create() and uuid_create_nil() functions create UUIDs. To convert from the binary representation to the string representation or vice versa, use uuid_to_string() or uuid_from_string() respectively.

The uuid_to_string() function set *str to be a pointer to a buffer sufficiently large to hold the string. This pointer should be passed to free(3) to release the allocated storage when it is no longer needed.

The uuid_enc_le() and uuid_enc_be() functions encode a binary representation of a UUID into an octet stream in little-endian and big-endian byte-order, respectively. The destination buffer must be pre-allocated by the caller, and must be large enough to hold the 16-octet binary UUID. These routines are not part of the DCE RPC API. They are provided for convenience.

The uuid_dec_le() and uuid_dec_be() functions decode a UUID from an octet stream in little-endian and big-endian byte-order, respectively. These routines are not part of the DCE RPC API. They are provided for convenience.

The uuid_compare() and uuid_equal() functions compare two UUIDs for equality. UUIDs are equal if pointers a and b are equal or both NULL, or if the structures a and b point to are equal. uuid_compare() returns 0 if the UUIDs are equal, -1 if a is less than b, and 1 if a is greater than b. uuid_equal() returns 1 if the UUIDs are equal, 0 if they are not equal.

The uuid_is_nil() function compares a UUID to NULL. The function returns 1 if u is NULL or if the UUID consists of all zeros, and zero otherwise.

The uuid_hash() function returns a 16-bit hash value for the specified UUID.

RETURN VALUES

The successful or unsuccessful completion of the function is returned in the status argument. Possible values are:

`uuid_s_ok`	The function completed successfully.
`uuid_s_bad_version`	The UUID does not have a known version.
`uuid_s_invalid_string_uuid`
	The string representation of an UUID is not valid.
`uuid_s_no_memory`	The function can not allocate memory to store an UUID representation.

uuid_compare(), uuid_equal(), uuid_is_nil(), and uuid_hash() always set status to uuid_s_ok.

STANDARDS

The UUID functions conform to the DCE 1.1 RPC specification.

BUGS

This manpage can be improved.

UUID (3)

November 19, 2021

Please direct any comments about this manual page service to Ben Bullock. Privacy policy.

“	What will happen when the 32-bit Unix date goes negative in mid-January 2038 does not bear thinking about.	”
— Henry Spencer