Re: Can we modify 'text *' passed to a C function?

--- Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> m w <mttf2000(at)yahoo(dot)com> writes:
> > If I write a function that does a 'tolower()' on
> each
> > character of a parameter passed into my function,
> do I
> > have to allocate a new text object and initialize
> it
> > and copy the data, or can I modify that object in
> > place and return it?
>
> You must NEVER alter a pass-by-reference parameter,
> of text or
> any other data type. If you do, you are probably
> altering data
> in a disk buffer, thus changing the content of a
> tuple.

Thanks, I was concerned that may be the case, but I
could never find a definitive answer on this.

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