supermin
printf
supermin | printf | |
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2 | 16 | |
161 | 2,345 | |
1.2% | - | |
6.0 | 0.0 | |
4 months ago | about 1 year ago | |
OCaml | C | |
GNU General Public License v3.0 only | MIT License |
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supermin
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Nolibc: A minimal C-library replacement shipped with the kernel
He briefly mentions dietlibc ("not evolving anymore") and ulibc. I think he'd be better off contributing to those projects.
FWIW I have built a program that needs a tiny initramfs[1] and we've found that dietlibc and musl worked really well in producing very tiny programs. Using glibc is terrible however - it links huge amounts of code into even the smallest program.
[1] https://github.com/libguestfs/supermin/blob/86fd6f3e86ab99d5...
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RootFS Tooling
Supermin - libguestfs
printf
- Nanoprintf – The smallest public printf implementation for its feature set
- Thank you senpai!
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Sprintf without C library
https://github.com/mpaland/printf i think this would work
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Nolibc: A minimal C-library replacement shipped with the kernel
Seems unlikely. My spot check of the the two vfprintf implementations shows no flow from one to the other, and shows that part of the Cosmopolitan code has an older lineage than nolibc.
The nolibc source has many reference to copyright held by "Willy Tarreau", under LGPL-2.1 OR MIT license, with a copyright date starting in 2017.
The string "Tarreau" does not exist in the Cosmopolitan library, so that's a strong negative there. Let's look closer.
The file organization is quite different. And so is the implementation. So that's another negative.
Compare the vfprintf in nolibc at https://elixir.bootlin.com/linux/v6.2-rc4/source/tools/inclu... (a 'minimal vfprintf()') with the one in cosmopolitan starting at https://github.com/jart/cosmopolitan/blob/master/libc/stdio/....
Right away we can see nolibc places many functions in the same file while Cosmopolitan uses a one-function-per-filename organization.
Cosmopolitan's fvprintf locks the file (which nolibc doesn't need to do) then calls vfprintf_unlocked which calls __fmt at https://github.com/jart/cosmopolitan/blob/master/libc/fmt/fm... , which is the actual implementation. It look very different from NOLIBC's.
Okay, so perhaps that's they way now but not at the beginning?
We can also go back to Cosmopolitan's original implementation and see how vfprintf goes through https://github.com/jart/cosmopolitan/blob/c91b3c50068224929c... to call "palandprintf", which https://github.com/jart/cosmopolitan/blob/c91b3c50068224929c... says is copyright "Marco Paland" from 2014-2019.
That's a few years older than the start of nolibc, available from https://github.com/mpaland/printf , and part of https://github.com/embeddedartistry/libc , a "libc targeted for embedded systems usage".
Thus, multiple factors seem to agree that nolibc code is not used in the Cosmopolitan library.
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How should I go about implementing printf-like function in my library?
I wrap this C implementation in a C++ Logger class and use it to "print" into a simple buffer. Then the static buffer is periodically unrolled into a transport layer using a static Logger::transmit() function in my BSP. I'm working with very little flash, so the linked implementation is essential.
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A 1 hour interview for an embedded engineering position
There are many good and tiny printf's fir embedded on GitHub. https://github.com/mpaland/printf eg Better than the bsd printf mostly
- is it safe to use printf()?
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Sprintf on STM32?
I'm sure sprintf itself is working in their library, so try to find other issues first, BUT, as a last resort you can try another lib: https://github.com/mpaland/printf/
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Would you merge with them?
looked at that account, found this one too
What are some alternatives?
infra-devops - Infra and DevOps Utils, like Kickstart to RootFS file builder in docker/podman environment, using AlmaLinux as foundation. This utility can be used in CI/CD pipeline to build docker RootFS files
nanoprintf - The smallest public printf implementation for its feature set.
rootfs - Linux root file system builder in the spirit of buildroot
trice - 🟢 super fast 🚀 and tiny 🐥 embedded device 𝘾 printf-like trace ✍ code, works also inside ⚡ interrupts ⚡ and real-time PC 💻 logging (trace ID visualization 👀)
libc - libc targeted for embedded systems usage. Reduced set of functionality (due to embedded nature). Chosen for portability and quick bringup.
z88dk - The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries.
sig-cloud-instance-images
anal-encryption-2.0
linuxkit - A toolkit for building secure, portable and lean operating systems for containers
elk - A low footprint JavaScript engine for embedded systems
cosmopolitan - build-once run-anywhere c library
modorganizer - Mod manager for various PC games. Discord Server: https://discord.gg/ewUVAqyrQX if you would like to be more involved