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* [Bug libc/14455] New: roundup macro bug
@ 2012-08-10 23:43 mikulas at artax dot karlin.mff.cuni.cz
2013-03-07 19:48 ` [Bug libc/14455] " pashev.igor at gmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: mikulas at artax dot karlin.mff.cuni.cz @ 2012-08-10 23:43 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14455
Bug #: 14455
Summary: roundup macro bug
Product: glibc
Version: 2.16
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: unassigned@sourceware.org
ReportedBy: mikulas@artax.karlin.mff.cuni.cz
CC: drepper.fsp@gmail.com
Classification: Unclassified
When the first parameter of a roundup macro is a 64-bit number and the second
parameter is unsigned 32-bit number, the macro misbehaves. You should cast the
second parameter to long long or typeof of the first parameter before calling
the
~ operator.
Try this:
#include <stdio.h>
#include <sys/param.h>
int main(void)
{
printf("%llx\n", roundup(0x123456789abcdefLL, 4U));
return 0;
}
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* [Bug libc/14455] roundup macro bug
2012-08-10 23:43 [Bug libc/14455] New: roundup macro bug mikulas at artax dot karlin.mff.cuni.cz
@ 2013-03-07 19:48 ` pashev.igor at gmail dot com
2014-06-17 18:46 ` fweimer at redhat dot com
2014-06-25 10:50 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: pashev.igor at gmail dot com @ 2013-03-07 19:48 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14455
Igor Pashev <pashev.igor at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pashev.igor at gmail dot
| |com
--- Comment #1 from Igor Pashev <pashev.igor at gmail dot com> 2013-03-07 19:47:39 UTC ---
(In reply to comment #0)
> When the first parameter of a roundup macro is a 64-bit number and the second
> parameter is unsigned 32-bit number, the macro misbehaves. You should cast the
> second parameter to long long or typeof of the first parameter before calling
> the
> ~ operator.
>
> Try this:
>
> #include <stdio.h>
> #include <sys/param.h>
>
> int main(void)
> {
> printf("%llx\n", roundup(0x123456789abcdefLL, 4U));
> return 0;
> }
Probably, both args must be of the same width [1]
[1] https://blogs.oracle.com/jwadams/entry/macros_and_powers_of_two
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* [Bug libc/14455] roundup macro bug
2012-08-10 23:43 [Bug libc/14455] New: roundup macro bug mikulas at artax dot karlin.mff.cuni.cz
2013-03-07 19:48 ` [Bug libc/14455] " pashev.igor at gmail dot com
@ 2014-06-17 18:46 ` fweimer at redhat dot com
2014-06-25 10:50 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-17 18:46 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14455
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
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* [Bug libc/14455] roundup macro bug
2012-08-10 23:43 [Bug libc/14455] New: roundup macro bug mikulas at artax dot karlin.mff.cuni.cz
2013-03-07 19:48 ` [Bug libc/14455] " pashev.igor at gmail dot com
2014-06-17 18:46 ` fweimer at redhat dot com
@ 2014-06-25 10:50 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-25 10:50 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14455
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-25 10:50 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2012-08-10 23:43 [Bug libc/14455] New: roundup macro bug mikulas at artax dot karlin.mff.cuni.cz
2013-03-07 19:48 ` [Bug libc/14455] " pashev.igor at gmail dot com
2014-06-17 18:46 ` fweimer at redhat dot com
2014-06-25 10:50 ` fweimer at redhat dot com
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