You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mdev.rs
    path of file: ./repos/rustybox/util_linux
    
    the code of the file until where you have to start completion: use crate::libbb::appletlib::applet_name;
use crate::libbb::parse_config::parser_t;
use crate::libbb::ptr_to_globals::bb_errno;
use crate::libbb::skip_whitespace::skip_whitespace;
use crate::libbb::xfuncs_printf::xmalloc;
use crate::librb::__syscall_slong_t;
use crate::librb::bb_uidgid_t;
use crate::librb::size_t;
use crate::librb::smallint;
use libc;
use libc::chdir;
use libc::chmod;
use libc::chown;
use libc::close;
use libc::free;
use libc::getenv;
use libc::getpid;
use libc::kill;
use libc::mknod;
use libc::mode_t;
use libc::off64_t;
use libc::off_t;
use libc::open;
use libc::pid_t;
use libc::putenv;
use libc::sigaddset;
use libc::sigemptyset;
use libc::siginfo_t;
use libc::sigprocmask;
use libc::sigset_t;
use libc::sigtimedwait;
use libc::sigval;
use libc::slee
    
unsafe fn parse_envmatch_pfx(mut val: *mut libc::c_char) -> *mut libc::c_char {
  let mut nextp: *mut *mut envmatch = &mut (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals))
    .cur_rule
    .envmatch;
  loop {
    let mut e: *mut envmatch = std::ptr::null_mut();
    let mut semicolon: *mut libc::c_char = std::ptr::null_mut::<libc::c_char>();
    let mut eq: *mut libc::c_char = strchr(val, '=' as i32);
    if eq.is_null() {
      /* || eq == val? */
      return val;
    }
    if crate::libbb::endofname::endofname(val) != eq {
      return val;
    }
    semicolon = strchr(eq, ';' as i32);
    if semicolon.is_null() {
      return val;
    }
    /* ENVVAR=regex;... */
    e = crate::libbb::xfuncs_printf::xzalloc(::std::mem::size_of::<envmatch>() as libc::c_ulong)
      as *mut envmatch;
    *nextp = e;
    nextp = &mut (*e).next;
    (*e).envname = crate::libbb::xfuncs_printf::xstrndup(
      val,
      eq.wrapping_offset_from(val) as libc::c_long as libc::c_int,
    );
    *semicolon = '\u{0}' as i32 as libc::c_char;
    crate::libbb::xregcomp::xregcomp(&mut (*e).match_0, eq.offset(1), 1i32);
    *semicolon = ';' as i32 as libc::c_char;
    val = semicolon.offset(1)
  }
}