On 7/21/18 2:47 PM, Chris Schoenberg wrote:
> This only works in 4.4; earlier versions throw a 'bad substitution' error. It
> causes an infinite loop of calls between 'expand_prompt_string' and
> 'decode_prompt_string',
> where calls to 'xmalloc' exhaust the heap:
>
> $\{_@P};${_@P}
>
> I decided to report this because it is not a user-defined recursive
> function and it exhausts the heap rather than the stack.
It's user-defined recursive parameter expansion. A string that undergoes
prompt expansion performs parameter expansion, as documented. If that
parameter expansion passes the same string to prompt expansion, which
performs parameter expansion, you've got user-defined recursion.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
