C-procedure crashed in Postgres 8.3.3 when using 'text' variable (WinXP) - additional

Hello.
I'm trying to create a C-procedure returning text variable - again :).
Postgres 8.3.3 (standard binaries - so built by means of MSVC), WinXP SP2.
I also use MSVC 2005 for compilation my library.
Configuration type - Dynamic Library (.dll)
Additional include directories - D:\pgsql83\include;D:\pgsql83\include\server;D:\pgsql83\include\server\port\win32
Additional library directories - D:\pgsql83\lib
Additional dependencies - postgres.lib
Compile as C Code (/TC)
(By the way, I can't compile it as C++ Code (/TP)
In this case I get a lot of errors. F.e.
>d:\pgsql83\include\server\nodes\primnodes.h(1078) : error C2238: unexpected token(s) preceding ';'
1>d:\pgsql83\include\server\nodes\parsenodes.h(167) : error C2059: syntax error : 'typeid' )

So, here is the code:
--------------------------------------------------
include "postgres.h"
#include "fmgr.h"
#include "executor/executor.h"
#include "utils/timestamp.h"
#include "utils/builtins.h"
#include "utils/formatting.h"

#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif

#define GET_TEXT(cstrp) DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(cstrp)))

PG_FUNCTION_INFO_V1(getTimeFromApplication);
Datum
getTimeFromApplication(PG_FUNCTION_ARGS)
{
    PG_RETURN_TEXT_P(GET_TEXT("success"));
}

I can compile it and get the library, but there are some warnings:
1>d:\pgsql83\getstring\c_getstring.c(10) : warning C4273: 'Pg_magic_func' : inconsistent dll linkage
1>        d:\pgsql83\getstring\c_getstring.c(10) : see previous definition of 'Pg_magic_func'
1>d:\pgsql83\getstring\c_getstring.c(24) : warning C4273: 'pg_finfo_getTimeFromApplication' : inconsistent dll linkage
1>        d:\pgsql83\getstring\c_getstring.c(24) : see previous definition of 'pg_finfo_getTimeFromApplication'
1>d:\pgsql83\getstring\c_getstring.c(75) : warning C4311: 'type cast' : pointer truncation from 'char [8]' to 'Datum'
1>d:\pgsql83\getstring\c_getstring.c(75) : warning C4312: 'type cast' : conversion from 'Datum' to 'Pointer' of greater
size
1>d:\pgsql83\getstring\c_getstring.c(75) : warning C4311: 'type cast' : pointer truncation from 'varlena *' to 'Datum'
-------------------------------------------------------
Then I put the library into 'lib' directory and create the stored procedure:
CREATE OR REPLACE FUNCTION "service"."get_app_time" () RETURNS text AS
     '$libdir/getstring', 'pg_finfo_getTimeFromApplication'
     LANGUAGE C STRICT;

Then I try to run it:
select * from "service"."get_app_time" ();

And get an error:
ERROR:  invalid memory alloc request size 4294967293

What did I wrong?

Thanks in advance, Marina.