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Date: Tue, 14 Dec 2021 11:10:23 -0500
From: Andrew Snyder <arsnyder16@...il.com>
To: Andrew Snyder <arsnyder16@...il.com>, musl@...ts.openwall.com
Subject: Re: print does not support variable width plus padding
Sorry accidentally sent before attaching this
~# docker run -it --rm alpine /bin/ash
/ # /lib/libc.musl-x86_64.so.1
musl libc (x86_64)
Version 1.2.2
Dynamic Program Loader
Usage: /lib/libc.musl-x86_64.so.1 [options] [--] pathname [args]
/ # printf %0*i 2 1
ash: %0*i: invalid format
On Tue, Dec 14, 2021 at 11:09 AM Andrew Snyder <arsnyder16@...il.com> wrote:
> 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@...t70.net> wrote:
>
>> * Andrew Snyder <arsnyder16@...il.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?
>>
>>
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