[SQL] Make C file for create type

[Louise Catherine]

Hallo,
I found a problem making new data type kata,expecially
when make the C file ,can anyone help me solve it. 

This error occur when I'm compiling the C file :
/usr/lib/gcc-lib/i586-suse-linux/3.3.1/../../../crt1.o(.text+0x18):
In function `_start':
../sysdeps/i386/elf/start.S:98: undefined reference to
`main'
collect2: ld returned 1 exit status

Here it's my code :
file3.c
-------
#include "postgres.h"

typedef struct kata
{
  char kt[30];
} kata;

kata *input_kata(char *str);
char *output_kata(kata * kata);

kata *
input_kata(char *str)
{
    char kt[30];
    kata *result;

    if (sscanf(str, "( %s )", &kt) !=1)
    {
        printf ("error\n");
        return NULL;
    }

    result = (kata *) malloc(sizeof(kata));
    strcpy(result->kt,kt);
    return result;
}

char *
output_kata(kata * kata)
{
        char kt[30];
        char *result;

        strcpy(kt,kata->kt);

        if (strcmp(kt,NULL))
                return NULL;

        result = (char *) malloc(60);
        sprintf(result, "(%s)", kata->kt);
        return result;
}

kata.sql
--------
CREATE FUNCTION input_kata(cstring)
   RETURNS kata
   AS '_OBJWD_/file3'
   LANGUAGE C IMMUTABLE STRICT;

CREATE FUNCTION output_kata(kata)
   RETURNS cstring
   AS '_OBJWD_/file3'
   LANGUAGE C IMMUTABLE STRICT;

CREATE TYPE kata (
    INPUT = input_kata,
    OUTPUT = output_kata
)




                
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