Jeff Davis <pgsql@j-davis.com> writes:
> On Wed, 2023-04-19 at 16:45 -0400, Tom Lane wrote:
>> + if (c >= 0x100 || !iscalnum(c))
> I'm curious why you say >= 0x100 rather than >= 0x80?
Right, should be 0x80, my thinko.
> What's the purpose of the error? Is it to catch mistakes, or is it to
> reserve room for adding new escape sequences in the future?
As I read it, it's meant to leave room for defining more escapes.
If we allowed \x for any non-currently-defined "x" to just be "x",
then there would be a compatibility problem if we wanted to make
it mean something else. But I think it's sufficient to reserve
the ASCII letters for that purpose.
regards, tom lane