C-Language Functions: VarChar and Text arguments

Hi,

I have problems using 'varchar' and 'text' arguments for C functions.
Perhaps I am doing something wrong. I get garbage when I want to use
the arguments passed to the function. See the example:

My function as defined in my C program:
/*===========================================*/
PG_FUNCTION_INFO_V1(Test_Function);

Datum Test_Function(PG_FUNCTION_ARGS) /* varChar(10) varChar Text*/
{
VarChar* arg0_varChar10 = PG_GETARG_VARCHAR_P(0);
VarChar* arg1_varChar = PG_GETARG_VARCHAR_P(1);
text* arg2_textp = PG_GETARG_VARCHAR_P(2);

ereport( INFO, ( errcode( ERRCODE_SUCCESSFUL_COMPLETION ),
errmsg("Inputs :\n\targ0: %s\n\targ1: %s\n\targ2:
%s\n",VARDATA(arg0_varChar10), VARDATA(arg1_varChar),
VARDATA(arg2_textp))));

PG_RETURN_INT32(0);
}
/*=============================================*/

I run the following in PostgreSQL 8.4 to create the function:
------------------------------------------------
CREATE OR REPLACE FUNCTION Test_Function(varchar(10), varchar, text)
RETURNS integer
AS '$libdir/myDir/myLib', 'Test_Function'
LANGUAGE C
VOLATILE
STRICT
SECURITY DEFINER;
------------------------------------------------

The output I get when I call the function:
--------------------------------------------
My_database=# SELECT Test_Function('arg0', 'arg1', 'arg2');

is:

INFO: Inputs :
arg0: arg�V"�
arg1: arg1��O"
arg2: arg2��O"

test_function
---------------
0
(1 row)
--------------------------------------------

What is the 'garbage' I see at the end of the output?
Am I calling the correct functions in my C code to retrieve the
arguments and then the correct ones to display them?

In my original function I want to send the name of an entity to the
database and then add the name to a table but this is a problem if the
name is garbled.

Using: PostgreSQL 8.4
OS: Linux Ubuntu 9.10 Karmic Koala

--
Carel Combrink
s25291930(at)tuks(dot)co(dot)za

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