| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Michael Enke" <michael(dot)enke(at)wincor-nixdorf(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #2574: C function: arg TEXT data corrupt |
| Date: | 2006-08-14 15:27:00 |
| Message-ID: | 9678.1155569220@sss.pgh.pa.us |
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| Lists: | pgsql-bugs pgsql-general |
"Michael Enke" <michael(dot)enke(at)wincor-nixdorf(dot)com> writes:
> I created a C function:
> extern Datum test_arg(PG_FUNCTION_ARGS);
> PG_FUNCTION_INFO_V1(test_arg);
> Datum test_arg(PG_FUNCTION_ARGS) {
> elog(INFO, "arg: %s", VARDATA(PG_GETARG_TEXT_P(0)));
> PG_RETURN_INT16(0);
The VARDATA of a TEXT datum is not a C string; in particular it is not
guaranteed to be null-terminated. This is an error in your code not
a bug.
The usual way to get a C string from a TEXT datum is to call textout,
eg
str = DatumGetCString(DirectFunctionCall1(textout, datumval));
regards, tom lane
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