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: ps.rs
    path of file: ./repos/rustybox/procps
    
    the code of the file until where you have to start completion: use crate::libbb::llist::llist_t;
use crate::libbb::xfuncs_printf::xmalloc;
use crate::librb::procps_status_t;
use crate::librb::size_t;
use libc;
use libc::isatty;
use libc::printf;
use libc::sprintf;
use libc::strchr;
use libc::strcpy;
extern "C" {

  #[no_mangle]
  fn snprintf(
    _: *mut libc::c_char,
    _: libc::c_ulong,
    _: *const libc::c_char,
    _: ...
  ) -> libc::c_int;

  #[no_mangle]
  fn strncmp(_: *const libc::c_char, _: *const libc::c_char, _: libc::c_ulong) -> libc::c_int;

  #[no_mangle]
  fn strlen(__s: *const libc::c_char) -> size_t;

  #[no_mangle]
  static mut bb_common_bufsiz1: [libc::c_char; 0];
  #[no_mangle]
  fn sysinfo(__info: *mut sysinfo) -> libc::c_int;
}

pub type C2RustUnnamed = libc::c_uint;
pub const PSSCAN_TASKS: C2RustUnnamed = 4194304;
pub const PSSCAN_RUIDGID: C2RustUnnamed = 2097152;
pub const PSSCAN_NICE: C2RustUnnamed = 1048576;
pub const PSSCAN_CPU: C2RustUnnamed = 524288;
pub const PSSCAN_START_TIME: C2RustUnnamed = 262144;
pub const PSSCAN_CONTEXT: C2RustUnnamed = 0;
pub const PSSCAN_ARGVN: C2RustUnnamed = 65536;
pub const PSSCAN_SMAPS: C2RustUnnamed = 32768;
pub const PSSCAN_TTY: C2RustUnnamed = 16384;
pub const PSSCAN_UTIME: C2Ru
    
pub unsafe fn ps_main(mut _argc: libc::c_int, mut argv: *mut *mut libc::c_char) -> libc::c_int {
  let mut p: *mut procps_status_t = std::ptr::null_mut();
  let mut opt_o: *mut llist_t = std::ptr::null_mut();
  let mut default_o: [libc::c_char; 19] = [0; 19];
  let mut opt: libc::c_int = 0;
  (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals)).seconds_since_boot = get_uptime();
  // POSIX:
  // -a  Write information for all processes associated with terminals
  //     Implementations may omit session leaders from this list
  // -A  Write information for all processes
  // -d  Write information for all processes, except session leaders
  // -e  Write information for all processes (equivalent to -A)
  // -f  Generate a full listing
  // -l  Generate a long listing
  // -o col1,col2,col3=header
  //     Select which columns to display
  /* We allow (and ignore) most of the above. FIXME.
   * -T is picked for threads (POSIX hasn't standardized it).
   * procps v3.2.7 supports -T and shows tids as SPID column,
   * it also supports -L where it shows tids as LWP column.
   */
  opt = crate::libbb::getopt32::getopt32(
    argv,
    b"Zo:*aAdeflT\x00" as *const u8 as *const libc::c_char,
    &mut opt_o as *mut *mut llist_t,
  ) as libc::c_int;
  if !opt_o.is_null() {
    loop {
      parse_o(crate::libbb::llist::llist_pop(&mut opt_o) as *mut libc::c_char);
      if opt_o.is_null() {
        break;
      }
    }
  } else {
    /* Below: parse_o() needs char*, NOT const char*,
     * can't pass it constant string. Need to make a copy first.
     */
    strcpy(
      default_o.as_mut_ptr(),
      b"pid,user,time,args\x00" as *const u8 as *const libc::c_char,
    );
    parse_o(default_o.as_mut_ptr());
  }
  if opt & OPT_T as libc::c_int != 0 {
    (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals)).need_flags |= PSSCAN_TASKS as libc::c_int
  }
  /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
   * and such large widths */
  (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals)).terminal_width =
    MAX_WIDTH as libc::c_int as libc::c_uint;
  if isatty(1i32) != 0 {
    (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals)).terminal_width =
      crate::libbb::xfuncs::get_terminal_width(0i32) as libc::c_uint;
    let ref mut fresh4 = (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals)).terminal_width;
    *fresh4 = (*fresh4).wrapping_sub(1);
    if *fresh4 > MAX_WIDTH as libc::c_int as libc::c_uint {
      (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals)).terminal_width =
        MAX_WIDTH as libc::c_int as libc::c_uint
    }
  }
  alloc_line_buffer();
  format_header();
  p = std::ptr::null_mut();
  loop {
    p = crate::libbb::procps::procps_scan(
      p,
      (*(bb_common_bufsiz1.as_mut_ptr() as *mut globals)).need_flags,
    );
    if p.is_null() {
      break;
    }
    format_process(p);
  }
  return 0;
}