postgis_srs_codes()

Datum postgis_srs_codes

(

PG_FUNCTION_ARGS

)

Definition at line 639 of file postgis/lwgeom_transform.c.

{
#if POSTGIS_PROJ_VERSION < 60
        elog(ERROR, "%s is not supported with Proj < 6.0", __func__);
#else
        FuncCallContext *funcctx;
        MemoryContext oldcontext;
        struct srs_data *state;
        Datum result;
        text* auth_name = PG_GETARG_TEXT_P(0);
        text* auth_code;
 
        /*
        * On the first call, fill in the state with all
        * of the auth_name/auth_srid pairings in the
        * proj database. Then the per-call routine is just
        * one isolated call per pair.
        */
        if (SRF_IS_FIRSTCALL())
        {
                /*
                * Only a subset of supported proj types actually
                * show up in spatial_ref_sys
                */
                funcctx = SRF_FIRSTCALL_INIT();
                oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
                state = srs_state_init();
                srs_state_codes(text_to_cstring(auth_name), state);
                funcctx->user_fctx = state;
                MemoryContextSwitchTo(oldcontext);
        }
 
        /* Stuff done on every call of the function */
        funcctx = SRF_PERCALL_SETUP();
        state = funcctx->user_fctx;
 
        /* Exit when we've read all entries */
        if (!state->num_entries || state->current_entry == state->num_entries)
        {
                SRF_RETURN_DONE(funcctx);
        }
 
        /* Read the code for this entry */
        auth_code = state->entries[state->current_entry++].auth_code;
        result = PointerGetDatum(auth_code);
 
        /* We are returning setof(text) */
        if (result)
                SRF_RETURN_NEXT(funcctx, result);
 
        /* Stop if lookup fails drastically */
        SRF_RETURN_DONE(funcctx);
        SRF_RETURN_DONE(funcctx);
#endif
}

References srs_entry::auth_code, srs_data::current_entry, srs_data::entries, srs_data::num_entries, result, srs_state_codes(), and srs_state_init().

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