ltree_plpython.c

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#include "postgres.h"
 
#include "fmgr.h"
#include "ltree/ltree.h"
#include "plpy_util.h"
 
PG_MODULE_MAGIC_EXT(
                    .name = "ltree_plpython",
                    .version = PG_VERSION
);
 
/* Linkage to functions in plpython module */
typedef PyObject *(*PLyUnicode_FromStringAndSize_t) (const char *s, Py_ssize_t size);
static PLyUnicode_FromStringAndSize_t PLyUnicode_FromStringAndSize_p;
 
 
/*
 * Module initialize function: fetch function pointers for cross-module calls.
 */
void
_PG_init(void)
{
    /* Asserts verify that typedefs above match original declarations */
    AssertVariableIsOfType(&PLyUnicode_FromStringAndSize, PLyUnicode_FromStringAndSize_t);
    PLyUnicode_FromStringAndSize_p = (PLyUnicode_FromStringAndSize_t)
        load_external_function("$libdir/" PLPYTHON_LIBNAME, "PLyUnicode_FromStringAndSize",
                               true, NULL);
}
 
 
/* These defines must be after the module init function */
#define PLyUnicode_FromStringAndSize PLyUnicode_FromStringAndSize_p
 
 
PG_FUNCTION_INFO_V1(ltree_to_plpython);
 
Datum
ltree_to_plpython(PG_FUNCTION_ARGS)
{
    ltree      *in = PG_GETARG_LTREE_P(0);
    int         i;
    PyObject   *list;
    ltree_level *curlevel;
 
    list = PyList_New(in->numlevel);
    if (!list)
        ereport(ERROR,
                (errcode(ERRCODE_OUT_OF_MEMORY),
                 errmsg("out of memory")));
 
    curlevel = LTREE_FIRST(in);
    for (i = 0; i < in->numlevel; i++)
    {
        PyList_SetItem(list, i, PLyUnicode_FromStringAndSize(curlevel->name, curlevel->len));
        curlevel = LEVEL_NEXT(curlevel);
    }
 
    PG_FREE_IF_COPY(in, 0);
 
    return PointerGetDatum(list);
}