Pavel Stehule <[EMAIL PROTECTED]> writes:
> I found some problem with PG_RETURN_TEXT_P.

Fix your code to not scribble on memory that doesn't belong to it,
and all will be well.  I can see at least two buffer-overrun bugs,
and there may be more:

      txtn = (text *) palloc (ma);      -- forgot to add VARHDRSZ

  strcpy (*str_pointer, str);           -- copies one byte too many

                        regards, tom lane

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