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ECPG Segfault and variable usage question.

From: Jürgen Cappel <email(at)juergen-cappel(dot)de>
To: "pgsql-interfaces" <pgsql-interfaces(at)postgresql(dot)org>
Subject: ECPG Segfault and variable usage question.
Date: 2004-02-12 19:00:12
Message-ID: JEEKIPNAKJNCFLMOBKHGAEEEDCAA.email@juergen-cappel.de (view raw or flat)
Thread:
Lists: pgsql-interfaces
Hello,

this is a code snippet that causes ECPG to segfault. It's quite tricky
to produce, as changing the variable name from 'var' to 'myvar' already
causes things to compile fine ...


#define CHAR_LENGTH 25
myfunction ()
{
    EXEC SQL BEGIN DECLARE SECTION;
    char   var[2*CHAR_LENGTH];
    EXEC SQL END DECLARE SECTION;

    EXEC SQL DECLARE mycursor CURSOR FOR
	 SELECT att1, att2
	 FROM mytable
	 WHERE att1 LIKE :var ESCAPE '\\';
    EXEC SQL OPEN mycursor;
}

Stack trace was obtained using a snapshot from about 2 weeks ago, ECPG from
the 7.4.1 release segfaults also.

#0  0x4015fdcb in chunk_free () from /lib/libc.so.6
#1  0x4015fc53 in free () from /lib/libc.so.6
#2  0x080685b7 in dump_variables (list=0x80c1408, mode=1) at variable.c:405
#3  0x08066d56 in output_statement (
    stmt=0x80c14f8 "declare mycursor  cursor  for select  att1  , att2
from mytable where att1  like  ? escape '\\\\'  ", mode=0, con=0x0) at
output.c:126
#4  0x0804af02 in yyparse () at preproc.y:780
#5  0x0806671d in main (argc=8, argv=0xbffff264) at ecpg.c:409
#6  0x401089ed in __libc_start_main () from /lib/libc.so.6


Another problem that's giving me headaches trying to find a workaround for
is the following use of variables as data sources in INSERT/UPDATE
statements:

	:myarray[index[10]]

Any comments, suggestions, hints ?   Thanks a lot,

Jürgen


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