I would like to be cc'd on the replies 

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