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On 05/16/2012 03:02 PM, Charles Chance wrote:
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"
cite="mid:4fb2d24d.0e34d80a.1a78.ffff8c81SMTPIN_ADDED@mx.google.com"
type="cite">
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<p class="MsoNormal"><font color="black" face="Arial"
size="2"><span style="font-size:
10.0pt;font-family:Arial">Currently testing devel
version and experiencing the
following when using pua_dialoginfo:<u1:p></u1:p></span></font><u5:p></u5:p><o:p></o:p></p>
<p class="MsoNormal"><font color="black" face="Arial"
size="2"><span style="font-size:
10.0pt;font-family:Arial"><u1:p> </u1:p></span></font><u5:p></u5:p><o:p></o:p></p>
<p class="MsoNormal"><font color="black" face="Arial"
size="2"><span style="font-size:
10.0pt;font-family:Arial">-------------------------------------<u1:p></u1:p></span></font><u5:p></u5:p><o:p></o:p></p>
<p class="MsoNormal"><font color="black" face="Arial"
size="2"><span style="font-size:
10.0pt;font-family:Arial">Program terminated with
signal 11, Segmentation fault.<u1:p></u1:p></span></font><u5:p></u5:p><o:p></o:p></p>
<p class="MsoNormal"><font color="black" face="Arial"
size="2"><span style="font-size:
10.0pt;font-family:Arial">#0 core_hash (t=0xb3d7e330,
type=1024,
ps=0xbfcc31c8) at ../../hashes.h:279<u1:p></u1:p></span></font><u5:p></u5:p><o:p></o:p></p>
<p class="MsoNormal"><font color="black" face="Arial"
size="2"><span style="font-size:
10.0pt;font-family:Arial">279
v=(*p<<24)+(p[1]<<16)+(p[2]<<8)+p[3];<u1:p></u1:p></span></font><u5:p></u5:p><o:p></o:p></p>
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style="font-size:12.0pt"></span></font><br>
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Hello, <br>
Don't know if this is related, but the statement above hides a nasty
bug: p[1] is a char (as for the description), so is signed, shifting
to the left 16 bits is ok, as an integral promotion takes place. The
problem is that if p[1] is negative (-1 is 0xff), then the integral
promotion is signed as well and is complementary of 2 (or whatever
the implementation considers), and the shift will return another
value as expected.<br>
<br>
For example :<br>
#include <stdio.h><br>
<br>
int main(){<br>
char b = 0xff;<br>
unsigned h = (b<<16);<br>
printf("%x\n", h);<br>
return 0;<br>
}<br>
<br>
will print ffff0000 instead of ff0000 as expected. Haven't
calculated the implication of this related to the bug. An fix would
be to cast p[1] to (unsigned char)<br>
<br>
Cheers,<br>
Marius<br>
<br>
<br>
<font color="black" face="Arial" size="2"><span style="font-size:
10.0pt;font-family:Arial"></span></font><br>
<br>
<pre class="moz-signature" cols="72">--
Zbihlei Marius
Head of
Linux Development Services Romania
1&1 Internet Development srl Tel KA: 754-9152
Str Mircea Eliade 18 Tel RO: +40-31-223-9152
Sect 1, Bucuresti mailto: <a class="moz-txt-link-abbreviated" href="mailto:marius.zbihlei@1and1.ro">marius.zbihlei@1and1.ro</a>
71295, Romania
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