Function

I'm trying to write a function which is defined as follows:

create function lseg_res(path,path) returns _lseg
as '/net/ipfy/angel/postgres/geometry/libMWgeom.so' language 'c';

The output value is supposed to be an array, but what I get is "{}".
I don't know whether

-the function is not well defined, or
-the output value can not be an array

The code:

#include "../include/geometry.h"

LSEG *lseg_res(PATH *p1,PATH *p2)

{

int4 i,j;

bool c;

LSEG *result[p1->npts] ;

for (j = 0; j < p1->npts; j++)

{

result[j] = palloc (sizeof(LSEG));

}

c = path_inter(p1,p2);

if (c == TRUE )

{

for (i = 0 ; i< p1->npts ; i ++)

{

result[i] = lseg_construct( &p1->p[i], &p1->p[i + 1]);

return result[i];

}

return NULL;

}

Thank you very much.

Angel Manuel Diaz Aunion.
Institut fuer Photogrametrie und Fernerkundung.
Universitaet Karlsruhe.