I get an error from printf i assume that underlying printf function is returning error code.  In my native implementation i get incorrect results and really depends on the parameters i didn't dig into too deep to see what the pattern was 


On Tue, Dec 14, 2021 at 11:03 AM Szabolcs Nagy <nsz@port70.net> wrote:
* Andrew Snyder <arsnyder16@gmail.com> [2021-12-14 10:22:42 -0500]:
> I would like to be cc'd on the replies
>
> Looks like a bug in the musl printf functionality
>
> When using variable width format string and specifying a padding musl fails
> to format properly.
>
> I am using musl indirectly through an emscripten compile of a native
> library.
>
> Consider the following repro steps using alpine docker image. Correct
> results exist when using ubuntu image
>
> # Correct expected  ' 1'
> docker run -it --rm alpine printf %2i 1
> # Correct expected  ' 1'
> docker run -it --rm alpine printf %*i 2 1
> # Correct expected  '01'
> docker run -it --rm alpine printf %02i 1
> # errors, Expected '01'
> docker run -it --rm alpine printf %0*i 2 1

i get the expected result on alpine

$ printf %0*i 2 1
01

what do you get?