rfc_1982.h File Reference

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

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

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().

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.