printf
trice
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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
trice
- Fully Permissive License C++ Logger For Embedded System
- Logging inside ISR
- How useful are tool tracing software for RTOS in industry?
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Super fast and small firmware embedded tracing
If you ever wished to have an universal printf like option inside an interrupt for runtime analysis of your microcontroller code, have a look at the little Trice tracer code at github.com. If offers you a comfortable and very efficient way getting logs from your target device and reduces the memory footprint. Sound impossible? It is true and open source! https://github.com/rokath/trice
- Trice – TRace Ids C Embedded
What are some alternatives?
nanoprintf - The smallest public printf implementation for its feature set.
tlog - Observability events system
z88dk - The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries.
zephyr - Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
elk - A low footprint JavaScript engine for embedded systems
tlog - Terminal I/O logger
anal-encryption-2.0
defmt - Efficient, deferred formatting for logging on embedded systems
vformat - A Python str.format() like formatter, based on Text.Printf
stumpless - a C logging library built for high performance and a rich feature set
modorganizer - Mod manager for various PC games. Discord Server: https://discord.gg/ewUVAqyrQX if you would like to be more involved
emio - A safe and fast high-level and low-level character input/output library for bare-metal and RTOS based embedded systems with a very small binary footprint.