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address the strnvis(3) portability fiasco strnvis originates on OpenBSD. When NetBSD added it to their libc they decided to swap the argument. Without starting a holy war on the "best" argument order, adding an implementation of a function that's widely available and making its signature purposefully incompatible is beyond justification. FreeBSD (and so macos too?) followed NetBSD in this, so we end up with *two* major and incompatible strnvis implementations. libbsd is in a limbo, they started with the OpenBSD version but they'll probably switch to the NetBSD version in the future. That's why we can't have nice things. Do the right thing(tm) and check for the presence of the original strnvis(3), if not available or broken use the bundled one.
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 1 d13b044d 2023-08-07 op /*

 2 d13b044d 2023-08-07 op  * Copyright (c) 2023 Omar Polo <op@omarpolo.com>

 3 d13b044d 2023-08-07 op  *

 4 d13b044d 2023-08-07 op  * Permission to use, copy, modify, and distribute this software for any

 5 d13b044d 2023-08-07 op  * purpose with or without fee is hereby granted, provided that the above

 6 d13b044d 2023-08-07 op  * copyright notice and this permission notice appear in all copies.

 7 d13b044d 2023-08-07 op  *

 8 d13b044d 2023-08-07 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 9 d13b044d 2023-08-07 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

10 d13b044d 2023-08-07 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

11 d13b044d 2023-08-07 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

12 d13b044d 2023-08-07 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

13 d13b044d 2023-08-07 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

14 d13b044d 2023-08-07 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

15 d13b044d 2023-08-07 op  */

16 d13b044d 2023-08-07 op 

17 d13b044d 2023-08-07 op #include <stdlib.h>

18 d13b044d 2023-08-07 op #include <vis.h>

19 d13b044d 2023-08-07 op 

20 d13b044d 2023-08-07 op int

21 d13b044d 2023-08-07 op main(void)

22 d13b044d 2023-08-07 op {

23 d13b044d 2023-08-07 op 	char buf[128];

24 d13b044d 2023-08-07 op 

25 d13b044d 2023-08-07 op 	return strnvis(buf, "Hello, world!\n", sizeof(buf), 0);

26 d13b044d 2023-08-07 op }