[metapost] Uninitialized variable sometimes causing malformed TFM files

[luigi scarso]

On Wed, Mar 20, 2019 at 6:54 PM Marcel Krüger <tex at 2krueger.de> wrote:

>  ---- On Wed, 20 Mar 2019 18:29:09 +0100 luigi scarso <
> luigi.scarso at gmail.com> wrote ----
>  >
>  >
>  > On Sat, Mar 16, 2019 at 6:04 PM Marcel Krüger <tex at 2krueger.de>
> wrote:
>  >
>  > sorry for delay, I will it asap. --
>  > luigi
>
> Thanks. There is one other thing, I do not really know if I would describe
> it as a backward compatibility bug or a feature request:
>
> For non-"scaled" numbersystems, code like
>
> filldraw stroke z1e--z2e;
> (example taken from cmbase.mf, `left_bracket`)
>
> fail, because z1e-- is interpreted as z 1e- - instead of z1e --. So
> z1e--z2e is equal to z1-z2e, leading to lots of errors.
>
> I understand that the new numbersystems and the exponential syntax can
> lead to problems of this kind, but I think this could be avoided:
> Maybe a `e+` / `e-` could only be interpreted as exponential notation if
> it is followed by a  digit? I do not think
> anyone would write "1e-" or "3e+" for 1 or 3, so it should not lead to any
> breakage.
> On the other hand it would catch almost all cases where this is invoked
> accidentially.
>
> A possible implementation of this change  is attached.
>
>
hm it looks like a serious bug, and I fear I will not able to fix it for
next TL --- but I hope to put it into trunk immediately after the TL code
is frozen.



-- 
luigi
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