From: | Patrick Welche <prlw1(at)newn(dot)cam(dot)ac(dot)uk> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | write past chunk end in ExprContext / to_char |
Date: | 2007-06-28 18:16:51 |
Message-ID: | 20070628181651.GR19698@quartz.itdept.newn.cam.ac.uk |
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Lists: | pgsql-hackers |
With today's CVS code (originally noticed with 8.2beta3), on a PC where
INT_MAX=0x7FFFFFFF=2147483647
postgres=# select version();
version
---------------------------------------------------------------------------------------------------------------------------------
PostgreSQL 8.3devel on i386-unknown-netbsdelf4.99.20, compiled by GCC gcc (GCC) 4.1.2 20070110 prerelease (NetBSD nb1 20070603)
(1 row)
postgres=# select to_char(2147483647,'999,999,999');
to_char
--------------
###,###,###
(1 row)
postgres=# select to_char(2147483648,'999,999,999');
WARNING: detected write past chunk end in ExprContext 0x845509c
WARNING: detected write past chunk end in ExprContext 0x845509c
to_char
--------------
###,###,###
(1 row)
postgres=# select to_char(2147483648,'99,999,999');
to_char
-------------
##,###,###
(1 row)
postgres=# select to_char(2147483648,'9,999,999,999');
to_char
----------------
2,147,483,648
(1 row)
postgres=# select to_char(1234567890123,'999,999,999,999');
WARNING: detected write past chunk end in ExprContext 0x845509c
WARNING: detected write past chunk end in ExprContext 0x845509c
to_char
------------------
###,###,###,###
(1 row)
postgres=# select to_char(1234567890123,'99,999,999,999');
to_char
-----------------
##,###,###,###
(1 row)
So strangely, to get the worrying WARNING, I seem to need >INT_MAX with
a format string with 1 less positions than necessary - no wonder I
seemed to only see it randomly...
Thoughts?
Cheers,
Patrick
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