yamt commented on code in PR #15320:
URL: https://github.com/apache/nuttx/pull/15320#discussion_r1896516465
##########
libs/libc/stdio/lib_libvsprintf.c:
##########
@@ -911,6 +915,11 @@ static int vsprintf_internal(FAR struct lib_outstream_s
*stream,
size = 1;
goto str_lpad;
+ case 'm': /* Print error message (%m) */
+ pnt = strerror(saved_errno);
+ size = strlen(pnt); /* Adjusting the size is not supported by %m */
+ goto str_lpad;
+
Review Comment:
> The problem is `syslog` uses the internals of the `vnprintf` to do the
processing to reduce code duplication. This is widely used across `libc`
variants, I attached an example script in the description.
>
> If you run a locally compiled program - no NuttX, just `libc` - that uses
`%m` through a `printf` or similar, it will print the errno string value
macOS:
```
spacetanuki% ./a.out
spacetanuki% cc a.c
spacetanuki% ./a.out
printf also supports %m - m%
spacetanuki%
```
i'm sure most BSD variants work this way.
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