rfc_1982.c File Reference

This file contains functions for RFC 1982 serial number arithmetic. More...

#include "config.h"
#include "util/rfc_1982.h"

Functions
int	compare_1982 (uint32_t a, uint32_t b)
	RFC 1982 comparison, uses unsigned integers, and tries to avoid compiler optimization (eg.
uint32_t	subtract_1982 (uint32_t a, uint32_t b)
	RFC 1982 subtraction, uses unsigned integers, and tries to avoid compiler optimization (eg.

Detailed Description

This file contains functions for RFC 1982 serial number arithmetic.

Function Documentation

compare_1982()

int compare_1982	(	uint32_t	a,
		uint32_t	b
	)

RFC 1982 comparison, uses unsigned integers, and tries to avoid compiler optimization (eg.

by avoiding a-b<0 comparisons).

Parameters

a	value to compare.
b	value to compare.

Returns

0 if equal, 1 if a > b, else -1.

Referenced by check_dates(), and edns_cookie_server_validate().

subtract_1982()

uint32_t subtract_1982	(	uint32_t	a,
		uint32_t	b
	)

RFC 1982 subtraction, uses unsigned integers, and tries to avoid compiler optimization (eg.

by avoiding a-b<0 comparisons).

Parameters

a	value to subtract from.
b	value to subtract.

Returns

the difference between them if we know that b is larger than a, that is the distance between them in serial number arithmetic.

Referenced by check_dates(), and edns_cookie_server_validate().