lemon <lsof@mailbox.org> on Tue, 2022/02/08 12:37:
> vsnprintf returns the byte count of the formatted output not including
> the null terminator, so in the case that len == 1024 the last character
> of the output was being truncated and not detected by the later check.
> Changing the greater than comparison to greater than or equal fixes this
> edge case.

We already have that pending...
https://git.zx2c4.com/cgit/commit/?h=ch/html-fmt&id=d828a623442e3fc3159e2c188a78e6fd4aca8af4
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Best regards             my address:    */=0;b=c[a++];)
putchar(b-1/(/*    Chris            cc -ox -xc - && ./x    */b/42*2-3)*42);}