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

# Correct expected  ' 1'
docker run -it --rm ubuntu printf %2i 1
# Correct expected  ' 1'
docker run -it --rm ubuntu printf %*i 2 1
# Correct expected  '01'
docker run -it --rm ubuntu printf %02i 1
# Correct expected  '01'
docker run -it --rm ubuntu printf %0*i 2 1

--Andrew