[M] Change in openvpn[master]: Add helper method to read an integer from a buffer

Attention is currently required from: cron2, plaisthos.

razvanc has posted comments on this change by plaisthos. ( http://gerrit.openvpn.net/c/openvpn/+/1855?usp=email )

Change subject: Add helper method to read an integer from a buffer
......................................................................


Patch Set 5:

(2 comments)

Patchset:

PS5: 
> `buf_read_u64()` reads a binary-encoded 8 byte integer, not a decimal-encoded one
OK, what about the `atoi_constrained()` remark? E.g. something like:

```
const char *len_str = extract_field(&buf, ',', &gc);
int payload_len;
if (!len_str
    || !atoi_constrained(len_str, &payload_len, "ACC payload length",
                         0, ACC_MAX_MSG_LEN, D_PUSH_ERRORS))
{
    err_reason = "could not parse payload length field";
    goto err;
}
```


File src/openvpn/buffer.c:

http://gerrit.openvpn.net/c/openvpn/+/1855/comment/e7c9606f_f382f14b?usp=email :
PS5, Line 1400:         if (c >= '0' && c <= '9')
> for explicit integer parsing, the code "as written" with explicit `c >= '0'... […]
Fair enough, can't argue with style preference. 😊



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Gerrit-MessageType: comment
Gerrit-Project: openvpn
Gerrit-Branch: master
Gerrit-Change-Id: Ifdd2122a3e60cdb11cc9df67570ab5628bfcdeea
Gerrit-Change-Number: 1855
Gerrit-PatchSet: 5
Gerrit-Owner: plaisthos <[email protected]>
Gerrit-CC: cron2 <[email protected]>
Gerrit-CC: openvpn-devel <[email protected]>
Gerrit-CC: razvanc <[email protected]>
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Gerrit-Comment-Date: Wed, 26 Aug 2026 06:25:30 +0000
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