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violet dagger Dec 28, 2024, 2:08 AM

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I would like to know where can I find the function definitions ? Inbuilt function definition for example:

strlen() or strcmp() or strrev()

I did try to find it on gcc official website but it's hard to navigate through it so can someone please tell me where can I get the source codes of inbuilt library function. Definitions are in the header file string.h but can't find the file string.c with source codes

nimble sundialBOT Dec 28, 2024, 2:08 AM

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When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

spark dragon Dec 28, 2024, 2:14 AM

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do you want the source code of glibc? or any libc in general?

violet dagger Dec 28, 2024, 2:15 AM

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To be precise I want just the function definitions of the inbuilt library function if it is there in the glibc or libc then yes please I would like that

spark dragon Dec 28, 2024, 2:17 AM

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that doesn't really answer my question. there are more than one libc implementations out there. glibc is one of them.

regardless you can find the glibc impl for the above functions here https://github.com/bminor/glibc/tree/master/string though i strongly advise you look for the musl impl instead. it way more readbale

violet dagger Dec 28, 2024, 2:19 AM

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Yup it has resolved my issue thanks for this and sorry for not being able to answer your question accurately. Just been 15 days since learning C so I don't know much about it

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!solved

nimble sundialBOT Dec 28, 2024, 2:19 AM

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Thank you and let us know if you have any more questions!

This thread is now set to auto-hide after an hour of inactivity

verbal cargo Dec 28, 2024, 2:20 AM

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@violet dagger Pro tip: https://codebrowser.dev/glibc/glibc/string/strlen.c.html

strlen.c source code [glibc/string/strlen.c] - Codebrowser

Browse the source of glibc glibc-2 using KDAB Codebrowser which provides IDE like features for browsing C, C++, Rust & Dart code in your browser

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Now, this is just the generic C version

spark dragon Dec 28, 2024, 2:20 AM

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Just been 15 days since learning C so I don't know much about it
why do you want to look into the libc source then?

verbal cargo Dec 28, 2024, 2:20 AM

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There are hand-vectorized implementations too which this tool can also help locate

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E.g. https://codebrowser.dev/glibc/glibc/sysdeps/x86_64/multiarch/strcat-strlen-avx2.h.S.html

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If you are super new to C I would caution that libc code can be pretty dense and not particularly well-written

violet dagger Dec 28, 2024, 2:22 AM

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spark dragon > Just been 15 days since learning C so I don't know much about it why do you wa...

Was just trying to solve a leetcode question challenged by someone to solve it without using library function well almost solved except for some memory errors but then I thought even the library function are functions then they should have an algorithm or code within it so I wanted to take a look thinking that they will have the best algorithm in terms of time and space complexity

spark dragon Dec 28, 2024, 2:24 AM

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they probably might, though #1322385671893159946 message especially in the case of glibc

violet dagger Dec 28, 2024, 2:26 AM

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I will try to understand but ya thanks for the source codes

spark dragon Dec 28, 2024, 2:28 AM

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i feel obligated to recommend musl's source code intsead

violet dagger Dec 28, 2024, 2:29 AM

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spark dragon i feel obligated to recommend musl's source code intsead

I will review both which ever suits me

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