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| author |   ast <ast@NetBSD.org> | 2014-10-02 21:36:37 +0000 |
|---|---|---|
| committer | ast <ast@NetBSD.org> | 2014-10-02 21:36:37 +0000 |
| commit | 2eb43769534644ef8af78e6a1fa70c755d41200b (patch) | |
| tree | f39dbbb28c3e53e18a61d031583f9cccc1c89416 /primes/pattern.c | |
| parent | d43706be7b336fd46d5a93d300182a17193f5544 (diff) | |
| download | bsdgames-darwin-2eb43769534644ef8af78e6a1fa70c755d41200b.tar.gz bsdgames-darwin-2eb43769534644ef8af78e6a1fa70c755d41200b.tar.zst bsdgames-darwin-2eb43769534644ef8af78e6a1fa70c755d41200b.zip | |
Imported and adapted from FreeBSD svn r272166 and r272207; this fixes
false positives for products of primes larger than 2^16. For example,
before this commit:
$ /usr/games/primes 4295360521 4295360522
4295360521
but
$ /usr/games/factor 4295360521
4295360521: 65539 65539
or
$ /usr/games/primes 3825123056546413049 3825123056546413050
3825123056546413049
yet
$ /usr/games/factor 3825123056546413049
3825123056546413049: 165479 23115459100831
or
$ /usr/games/primes 18446744073709551577
18446744073709551577
although
$ /usr/games/factor 18446744073709551577
18446744073709551577: 139646831 132095686967
Incidentally, the above examples show the smallest and largest cases that
were erroneously stated as prime in the range 2^32 .. 3825123056546413049
.. 2^64; the primes(6) program now stops at 3825123056546413050 as
primality tests on larger integers would be by brute force factorization.
In addition, special to the NetBSD version:
. for -d option, skip first difference when start is >65537 as it is incorrect
. corrected usage to mention both the existing -d as well as the new -h option
For original FreeBSD commit message by Colin Percival, see:
http://svnweb.freebsd.org/base?view=revision&revision=272166
Diffstat (limited to 'primes/pattern.c')
| -rw-r--r-- | primes/pattern.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/primes/pattern.c b/primes/pattern.c index 11960567..52784a5a 100644 --- a/primes/pattern.c +++ b/primes/pattern.c @@ -1,4 +1,4 @@ -/* $NetBSD: pattern.c,v 1.6 2003/08/07 09:37:33 agc Exp $ */ +/* $NetBSD: pattern.c,v 1.7 2014/10/02 21:36:37 ast Exp $ */ /* * Copyright (c) 1989, 1993 @@ -32,21 +32,20 @@ * SUCH DAMAGE. */ -#include <sys/cdefs.h> +#include <sys/types.h> + #ifndef lint #if 0 static char sccsid[] = "@(#)pattern.c 8.1 (Berkeley) 5/31/93"; #else -__RCSID("$NetBSD: pattern.c,v 1.6 2003/08/07 09:37:33 agc Exp $"); +__RCSID("$NetBSD: pattern.c,v 1.7 2014/10/02 21:36:37 ast Exp $"); #endif #endif /* not lint */ /* * pattern - the Eratosthenes sieve on odd numbers for 3,5,7,11 and 13 * - * By: Landon Curt Noll chongo@toad.com - * - * chongo <for a good prime call: 391581 * 2^216193 - 1> /\oo/\ + * By Landon Curt Noll, http://www.isthe.com/chongo/index.html /\oo/\ * * To avoid excessive sieves for small factors, we use the table below to * setup our sieve blocks. Each element represents a odd number starting @@ -440,4 +439,4 @@ const char pattern[] = { 0,0,1,1,0,0,0,0,1,1,0,0,1,0,1,0,0,0,0,0,0,1,0,1,1,0,1,1,0,1,0,0,0,1,0,0,1,0,1, 0,0,1,1,0,1,0,0,1,1,0,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,0,0,0,0,0,0,1 }; -const int pattern_size = (sizeof(pattern)/sizeof(pattern[0])); +const size_t pattern_size = (sizeof(pattern)/sizeof(pattern[0])); |