glibc | Cello | |
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25 | 18 | |
1,228 | 6,238 | |
- | - | |
0.0 | 0.0 | |
over 5 years ago | 8 months ago | |
C | C | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
glibc
- `Strlen` in Glibc
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How does sqrt() work in glibc?
I am writing a short paper for school and the topic is Fast Inverse Square Root and alternatives. One of the questions is how the sqrt-function is implemented in glibc. Here is the code of that function.
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A collection of lock-free data structures written in standard C++11
The code isn't the easiest to read but in glibc it seems that the syscall is only performed if waiter are detected in userspace during an unlock operation
https://github.com/lattera/glibc/blob/master/nptl/pthread_mu...
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Converting my new code (Bytearray2Float64) into 19 Programming Language
You might still not realize, but floats are a large topic. Have a look at eg. this implementation here: https://github.com/lattera/glibc/blob/master/stdlib/strtod_l.c
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Honest question about this "The byte order fallacy" blog post.
This is a nice write up, thank you. However, I'm stilling interpreting this as a "fun trick" rather than the common sense method for solving the problem. For example, looking at the source code for htonl() from glibc: https://github.com/lattera/glibc/blob/master/inet/htonl.c
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Dio deleted the tweet shortly after
Second of all: The horrifying truth is that there is no such thing as a canonical text representation for IPv4 (source) (and yes... I am indeed citing the failed attempt to standardize this as my source for it not being standardized). Authoritatively speaking, all possible (non-binary) representations are equally invalid. In fact, text address resolution is typically delegated to the OS kernel, so what constitutes a "usable" address is liable to vary depending on if you're using Linux, OSX, Windows, or Other.
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Discussion Thread
Optimized code gets really weird. The creators of strlen, for example, decided that iterating over each character to find the end was far too slow. So instead, they convert the character pointer into an int pointer and do bitwise manipulation with the int on two different magic numbers so they can check four/eight characters at once.
- Tengo una duda en algo C/C++
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How does jvm deal with syscalls
If you're using a cross-platform C compiler like gcc or clang, you're usually expected to switch to assembly. Here's the syscall instruction in glibc
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Math Functions with -nostdlib
Maybe you should include the math part of a libc statically with your code. glibc is one option, or dietlibc if you want it to be as small as possible.
Cello
- Libcello – higher level C programming
- The NSA list of memory-safe programming languages has been updated
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Object-oriented Programming with ANSI-C [pdf]
Yes, that's C. C macros can take you quite far. Unfortunately because it's just a bunch of macros, it's quite brittle. Like high level abstractions created with macros in assembly language. You have to do all the checking and reasoning about it since the compiler cannot.
[1] https://libcello.org/
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Better C Generics: The Extendible _Generic
It took me a long time to understand, coming from higher level programming, that a lot of exactly that "higher level" is just systematic fat pointer conventions. And because pointers-with-metadata is not a first-class language construct, we invent all these languages that codify a particular fat pointer convention. Cello is an example of what kinds of abstractions can be built on top of a tiny little bit of (non-native) fat pointer convention.
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OOP in C
There is a lightweight object oriented extension to C called Objective-C [1] that unfortunately never gained much traction outside the NeXT/Apple ecosystem. There is also Cello [2].
[1] https://en.wikipedia.org/wiki/Objective-C
[2] https://github.com/orangeduck/Cello
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Ask HN: Modern C Libraries
Regular expressions library to validate information before dumping to rocksdb.
https://www.gnu.org/software/libc/manual/html_node/Regular-E...
Non-critical implimentation fun, use cello [1] for 'gawk' functionality in C with C++ objects/classes.
[1] https://libcello.org/
- What does the ??!??! operator do in C?
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Is it possible to make C as safe as Rust?
You can achieve a fairly decent runtime safety for some types of project. Check out libcello and my own monster (libstent, lame presentation).
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Ask HN: I like studying the concept of abstractions
towards lisp related data structures / algorithms (aka recursive tree data structures & algorithms).
So, no distinction between metadata vs. structual storage unless noted.
Anything beyond that tends towards masters & upper level undergraduate level material. aka review the implimentation of a programming language for algorithm & data structure usage per language features.
aka Autonoma / regular expressions backround: Lisp in Small Pieces by Christian Queinnec; ; https://github.com/aalhour/awesome-compilers; On Lisp by Paul Graham; Let over Lambda by Doug Hoyte; C 'macro's pushed to maximum effect : https://libcello.org/
Left out Comparison of languages; Transform from lang a to lang b; and language implimentation as discussions tend to assume masters / upper level undergraduate knowledge
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Cake: C23 Front End and Transpiler C23 – C99
with skills like this, mind to push cello forward? https://github.com/orangeduck/Cello really like it but not skillful enough to do it myself.
What are some alternatives?
DirectXMath - DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
vos - Vinix is an effort to write a modern, fast, and useful operating system in the V programming language
fastapprox - Approximate and vectorized versions of common mathematical functions
cfront-3 - self education and historical research of the C++ compiler cfront v3
openlibm - High quality system independent, portable, open source libm implementation
v-mode - 🌻 An Emacs major mode for the V programming language.
libjxl - JPEG XL image format reference implementation
infer - A static analyzer for Java, C, C++, and Objective-C
nixpkgs - Nix Packages collection & NixOS
rust - Empowering everyone to build reliable and efficient software.
illumos-gate - An open-source Unix operating system
metaparse - A library for generating compile time parsers parsing embedded DSL code as part of the C++ compilation process