C23 implications for C libraries

The upcoming standard C23 has a lot of additions to the C library clause. Most of them are small, some of them are big but optional. I have now finished a first version of a document that summarizes many of the changes. It has some general discussions about the following subjects

and then lists changes to individual header files of the C library.

This does not contain an detailed description of the changes to the math.h header. First, I am really not an expert on that, and second the changes there are quite invasive and we don’t have a diff-file that would clearly list them.

3 thoughts on “C23 implications for C libraries”

Jonathan Leffler says:

December 9, 2022 at 03:06

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The “C23 Implications for C Libraries” document is interesting and helpful — thank you.

In section 6.5, you have __BITITNT_MAX__ several times — I think that should be __BITINT_MAX__ (one fewer T’s). Later (section 14.2), you have the shorter version.

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1. Jens Gustedt says:
  
  December 9, 2022 at 09:02
  
  Jonathan,
  thanks for sharing your observations.
  
  FYI: Not having a Twitter, WordPress or Facebook account, I can’t login to leave a comment.
  (OK: I have a Facebook account. I don’t use it, and I do my best to pretend it doesn’t exist, and
  I’ve never used it to login anywhere else, and I have no plans to change that decision.)
  
  Yes, I don’t have my DM’s open on my mostly dormant tw account either and I cancelled fb years ago.
  
  For everybody: if you want to have a public discussion on the contents of one of my posts go to mastodon, there is a link in the right panel.
  
  If you want to engage in a private conversation or just notify me about typos or factual errors, send me a mail or give me a call. If you live in the human realm there should not be much of a difficulty to find out how to reach me; for robots this seems still kind of tough.
  
  Thanks
  Jens
  
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Jonathan Leffler says:

December 9, 2022 at 04:51

Also, in section 5 (Const-contract of the C Library), you list:

bsearch_t bsearch …

Is the first one supposed to be bsearch_s?

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