"Pavel Stehule" <[EMAIL PROTECTED]> writes:

> Datum *const_fce(PG_FUNCTION_ARGS)
> {
>    text *txt = palloc(5 + VARHDRSZ);
>    memcpy(VARDATA(txt), "pavel", 5);
>    VARATT_SIZE(txt) = 5 + VARHDRSZ;
>    PG_RETURN_TEXT_P(txt);
> }

Much better practice is to use the input function of the data type you want to
convert to:

text *txt = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("pavel")));

Generally we want to do something with text value (concat, trim, ..) and then call textin isn't practic. Respective, for bussness processes implemented in C is textin and similar functions right. For string toolkit is better direct work with VARLENA struct.

Regards and thank you note


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