On Mon, Oct 22, 2018 at 9:58 PM Marcel Krüger <t...@2krueger.de> wrote:
> Hi,
>
> in the implementation of \letcharcode LuaTeX calls `set_token_info(cur_cs,
> cur_cs + cs_token_flag);`.
> This is weird, because the first argument to `set_token_info` is supposed
> to be a pointer to a one-word node as returned by `get_avail` and not a
> `cs`.
>
> I've got a document where this caused LuaTeX to overwrite a random token
> in a different macro every time `\letcharcode` was called.
> The active token isn't stored anywhere, so this can be fixed by just
> omitting `set_token_info`.
>
>
> Best regards
> Marcel Krüger
>
>
>
> Suggested patch:
>
> diff --git a/source/texk/web2c/luatexdir/tex/maincontrol.c
> b/source/texk/web2c/luatexdir/tex/maincontrol.c
> index 05e385b27..25acf1ea9 100644
> --- a/source/texk/web2c/luatexdir/tex/maincontrol.c
> +++ b/source/texk/web2c/luatexdir/tex/maincontrol.c
> @@ -2698,9 +2698,7 @@ void prefixed_command(void)
> /*tex |letcharcode| */
> scan_int();
> if (cur_val > 0) {
> - cur_cs = active_to_cs(cur_val, true);
> - set_token_info(cur_cs, cur_cs + cs_token_flag);
> - p = cur_cs;
> + p = active_to_cs(cur_val, true);
> do {
> get_token();
> } while (cur_cmd == spacer_cmd);
>
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>
Thank you for the report.
Do you have a sample document ?
--
luigi
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