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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://fosstodon.org/users/kees/statuses/113660727202510867">Kees Cook :tux: (kees@fosstodon.org)'s status on Monday, 16-Dec-2024 16:24:48 JST</a><a href="https://fosstodon.org/@kees" title="kees@fosstodon.org"><img src="https://gnusocial.jp/avatar/107149-48-20230725231521.webp" width="48" height="48" alt="Kees Cook :tux:" style="position: absolute; left: 0; top: 0;">Kees Cook :tux:</a></section><article><p>Dear C Lazy Web,</p><p>How do I define an array of nonstring char arrays?</p><p>just a char array, valid:<br>char str[4] __attribute__((nonstring)):</p><p>array of char arrays, cursed:<br>char multi[10][4] __attribute__((nonstring));</p><p>I've tried typedefs and moving the attribute around. No luck. What am I missing?</p><p>Here's a godbolt:<br><a href="https://godbolt.org/z/4Mb61heG1" rel="nofollow noreferrer">https://godbolt.org/z/4Mb61heG1</a><br>I'd want to see a warning for both strlen() instances...</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4194870#notice-8198851">In conversation</a><time datetime="2024-12-16T16:24:48+09:00" title="Monday, 16-Dec-2024 16:24:48 JST">about a month ago</time> <span>from <span><a href="https://fosstodon.org/@kees/113660727202510867" rel="external" title="Sent from fosstodon.org via ActivityPub">fosstodon.org</a></span></span><a href="https://fosstodon.org/@kees/113660727202510867">permalink</a><h4>Attachments</h4><ol><li><article><header><div>Domain not in remote thumbnail source whitelist: raw.githubusercontent.com</div><h5><a href="https://godbolt.org/z/4Mb61heG1">Compiler Explorer - C (x86-64 gcc (trunk))</a></h5><div> from <span>Matt Godbolt</span></div></header><div>struct foo {
  char str[8] __attribute__((nonstring));
  char multi[3][8] __attribute__((nonstring));
  int a;
};int len(struct foo *p)
{
    return strlen(p-&gt;str) +
           strlen(p-&gt;multi[2]);
}</div><footer></footer></article></li></ol></footer></blockquote>

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Kees Cook :tux: (kees@fosstodon.org)'s status on Monday, 16-Dec-2024 16:24:48 JST Kees Cook :tux:
Dear C Lazy Web,
How do I define an array of nonstring char arrays?
just a char array, valid:
char str[4] __attribute__((nonstring)):
array of char arrays, cursed:
char multi[10][4] __attribute__((nonstring));
I've tried typedefs and moving the attribute around. No luck. What am I missing?
Here's a godbolt:
https://godbolt.org/z/4Mb61heG1
I'd want to see a warning for both strlen() instances...
In conversationabout a month ago from fosstodon.orgpermalink
Attachments
1. Domain not in remote thumbnail source whitelist: raw.githubusercontent.com
  Compiler Explorer - C (x86-64 gcc (trunk))
  from Matt Godbolt
  struct foo { char str[8] __attribute__((nonstring)); char multi[3][8] __attribute__((nonstring)); int a; }; int len(struct foo *p) { return strlen(p->str) + strlen(p->multi[2]); }

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