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Allocate extra byte for NUL-terminator in read_post_data()

From Deucе@1:103/705 to GitLab note in main/sbbs on Sun Mar 8 10:53:35 2026

https://gitlab.synchro.net/main/sbbs/-/commit/0c0cb7c473285ab8c71f209ab2ce01a421a459e7#note_8515

Why would there be a NUL terminator?
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* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

From Deucе@1:103/705 to GitLab note in main/sbbs on Sun Mar 8 11:21:18 2026

https://gitlab.synchro.net/main/sbbs/-/commit/0c0cb7c473285ab8c71f209ab2ce01a421a459e7#note_8516

If it *does* need to be NUL terminated, you're going to have to add that space to the mapped file on disk too, and actually add the termination at some point.
--- SBBSecho 3.37-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

From Rob Swindell@1:103/705 to GitLab note in main/sbbs on Sun Mar 8 16:39:07 2026

https://gitlab.synchro.net/main/sbbs/-/commit/0c0cb7c473285ab8c71f209ab2ce01a421a459e7#note_8518

Line 6630 looks to be doing the NUL-termination:
```
session->req.post_data[session->req.post_len] = 0;
```
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* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

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