[Bug 220587] /bin/sh Incorrect options handling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220587

            Bug ID: 220587
           Summary: /bin/sh Incorrect options handling
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ryan at freqlabs.com

The system shell /bin/sh is consuming options after the command string when -c
is used. According to the synopsis, nothing after the -c command_string should
be interpreted as an option.

Furthermore, passing -s as the program_name argument causes the shell to read
from standard input, which is at odds with the description of the -c option in
the manual and in the POSIX standard.

The behavior on FreeBSD is inconsistent with the behavior on other operating
systems. A NetBSD and an Ubuntu Linux system were checked, and both have the
expected behavior.

Observed behavior:
```
$ sh -c 'echo $0 $@' -m foo
foo
$ sh -c 'echo $0 $@' -s foo
$ <child shell, reading commands from standard input>
```

Expected behavior:
```
$ sh -c 'echo $0 $@' -m foo
-m foo
$ sh -c 'echo $0 $@' -s foo
-s foo
```

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