Debian Bug report logs - #803459
drand48(3): errors on interval bounds

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Package: manpages-dev; Maintainer for manpages-dev is Dr. Tobias Quathamer <[email protected]>; Source for manpages-dev is src:manpages (PTS, buildd, popcon).

Reported by: Vincent Lefevre <[email protected]>

Date: Fri, 30 Oct 2015 10:21:02 UTC

Severity: normal

Tags: fixed-upstream

Found in version manpages/3.74-1

Fixed in version 4.04-1

Done: "Dr. Tobias Quathamer" <[email protected]>

Bug is archived. No further changes may be made.

Full log

Message #12 received at [email protected] (full text, mbox, reply):

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Subject: Re: Bug#803459: drand48(3): errors on interval bounds
To: Vincent Lefevre <[email protected]>, [email protected]
References: <[email protected]>
Cc: [email protected], [email protected]
From: "Michael Kerrisk (man-pages)" <[email protected]>
Message-ID: <[email protected]>
Date: Thu, 17 Dec 2015 15:12:32 +0100
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tags 803459 fixed-upstream
thanks

Hello Vincent
On 10/30/2015 11:17 AM, Vincent Lefevre wrote:
> Package: manpages-dev
> Version: 3.74-1
> Severity: normal
> 
> The drand48(3) man page contains:
> 
>        The  drand48()  and  erand48()  functions return nonnegative
>        double-precision floating-point values uniformly distributed
>        between [0.0, 1.0).
> 
> Instead of "between", it should be "over".
> 
> Then, more importantly, there are errors for lrand48, nrand48,
> lrand48, and jrand48:
> 
>        The  lrand48()  and  nrand48()  functions return nonnegative
>        long integers uniformly distributed between 0 and 2^31.
> 
>        The mrand48() and jrand48()  functions  return  signed  long
>        integers uniformly distributed between -2^31 and 2^31.
> 
> According to POSIX, the right bound is 2^31 - 1. Or if you want to
> keep 2^31, you should give a semi-open interval as in POSIX: [0,2^31)
> and [-2^31,2^31) respectively.

Upstream, I have applied the patch below. Thanks for the report.

Cheers,

Michael

diff --git a/man3/drand48.3 b/man3/drand48.3
index 1d4799f..0de9cf2 100644
--- a/man3/drand48.3
+++ b/man3/drand48.3
@@ -81,22 +81,22 @@ The
 and
 .BR erand48 ()
 functions return nonnegative
-double-precision floating-point values uniformly distributed between
-[0.0, 1.0).
+double-precision floating-point values uniformly distributed over the interval
+[0.0,\ 1.0).
 .PP
 The
 .BR lrand48 ()
 and
 .BR nrand48 ()
 functions return nonnegative
-long integers uniformly distributed between 0 and 2^31.
+long integers uniformly distributed over the interval [0,\ 2^31).
 .PP
 The
 .BR mrand48 ()
 and
 .BR jrand48 ()
 functions return signed long
-integers uniformly distributed between \-2^31 and 2^31.
+integers uniformly distributed over the interval [\-2^31,\ 2^31).
 .PP
 The
 .BR srand48 (),

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

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