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: seq.rs
    path of file: ./repos/rustybox/coreutils
    
    the code of the file until where you have to start completion: use crate::libbb::ptr_to_globals::bb_errno;
use libc;
use libc::printf;
extern "C" {
  #[no_mangle]
  fn strtod(__nptr: *const libc::c_char, __endptr: *mut *mut libc::c_char) -> libc::c_double;
  #[no_mangle]
  static mut optind: libc::c_int;

  #[no_mangle]
  fn strchrnul(__s: *const libc::c_char, __c: libc::c_int) -> *mut libc::c_char;
  #[no_mangle]
  fn strlen(__s: *const libc::c_char) -> size_t;

}

use crate::librb::size_t;
pub const OPT_w: C2RustUnnamed = 1;
pub type C2RustUnnamed = libc::c_uint;
pub const OPT_s: C2RustUnnamed = 2;

/*
 * seq implementation for busybox
 *
 * Copyright (C) 2004, Glenn McGrath
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
//config:config SEQ
//config:	bool "seq (3.8 kb)"
//config:	default y
//config:	help
//config:	print a sequence of numbers
//applet:IF_SEQ(APPLET_NOEXEC(seq, seq, BB_DIR_USR_BIN, SUID_DROP, seq))
/* was NOFORK, but then "seq 1 999999999" can't be ^C'ed if run by hush */
//kbuild:lib-$(CONFIG_SEQ) += seq.o
//usage:#define seq_trivial_usage
//usage:       "[-w] [-s SEP] [FIRST [INC]] LAST"
//usage:#define seq_full_usage "\n\n"
//usage:       "Print numbers from FIRST to LAST, in steps of INC.\n"
//usage:       "FIRST, INC default to 1.\n"
//usage:     "\n	-w	Pad to last with leading zeros"
//usage:     "\n	-s SEP	String separator"
/* This is a NOEXEC applet. Be very careful! */
pub unsafe fn seq_main(mut argc: libc::c_int, mut argv: *mut *mut libc::c_char) -> libc::c_int {
  let mut first: libc::c_double = 0.;
  let mut last: libc::c_double = 0.;
  let mut increment: libc::c_double = 0.;
  let mut v: libc::c_double = 0.;
  let mut n: libc::c_uint = 0;
  let mut width: libc::c_uint = 0;
  let mut frac_part: libc::c_uint = 0;
  let mut sep: *const libc::c_char = std::ptr::null();
  let mut opt_s: *const libc::c_char = b"\n\x00" as *const u8 as *const libc::c_char;
  let mut opt: libc::c_uint = 0;
  opt = crate::libbb::getopt32::getopt32(
    argv,
    b"+ws:\x00" as *const u8 as *const libc::c_char,
    &mut opt_s as *mut *const libc::c_char,
  );
  argc -= optind;
  argv = argv.offset(optind as isize);
  increment = 1i32 as libc::c_double;
  first = increment;
  *bb_errno = 0;
  's_87: {
    let mut pp: *mut libc::c_char = std::ptr::null_mut::<libc::c_char>();
    let mut current_block_10: u64;
    match argc {
      3 => {
        increment = strtod(*argv.offset(1), &mut pp);
        *bb_errno |= *pp as libc::c_int;
        current_block_10 = 7542340127038738699;
      }
      2 => {
        current_block_10 = 7542340127038738699;
      }
      1 => {
        current_block_10 = 9763345305552516820;
      }
      _ => {
        current_block_10 = 9712944753701882441;
      }
    }
    match current_block_10 {
      7542340127038738699 => {
        first = strtod(*argv.offset(0), &mut pp);
        *bb_errno |= *pp as libc::c_int;
        current_block_10 = 9763345305552516820;
      }
   
    
pub unsafe fn seq_main(mut argc: libc::c_int, mut argv: *mut *mut libc::c_char) -> libc::c_int {
  let mut first: libc::c_double = 0.;
  let mut last: libc::c_double = 0.;
  let mut increment: libc::c_double = 0.;
  let mut v: libc::c_double = 0.;
  let mut n: libc::c_uint = 0;
  let mut width: libc::c_uint = 0;
  let mut frac_part: libc::c_uint = 0;
  let mut sep: *const libc::c_char = std::ptr::null();
  let mut opt_s: *const libc::c_char = b"\n\x00" as *const u8 as *const libc::c_char;
  let mut opt: libc::c_uint = 0;
  opt = crate::libbb::getopt32::getopt32(
    argv,
    b"+ws:\x00" as *const u8 as *const libc::c_char,
    &mut opt_s as *mut *const libc::c_char,
  );
  argc -= optind;
  argv = argv.offset(optind as isize);
  increment = 1i32 as libc::c_double;
  first = increment;
  *bb_errno = 0;
  's_87: {
    let mut pp: *mut libc::c_char = std::ptr::null_mut::<libc::c_char>();
    let mut current_block_10: u64;
    match argc {
      3 => {
        increment = strtod(*argv.offset(1), &mut pp);
        *bb_errno |= *pp as libc::c_int;
        current_block_10 = 7542340127038738699;
      }
      2 => {
        current_block_10 = 7542340127038738699;
      }
      1 => {
        current_block_10 = 9763345305552516820;
      }
      _ => {
        current_block_10 = 9712944753701882441;
      }
    }
    match current_block_10 {
      7542340127038738699 => {
        first = strtod(*argv.offset(0), &mut pp);
        *bb_errno |= *pp as libc::c_int;
        current_block_10 = 9763345305552516820;
      }
      _ => {}
    }
    match current_block_10 {
      9763345305552516820 => {
        last = strtod(*argv.offset((argc - 1i32) as isize), &mut pp);
        if *bb_errno == 0 && *pp as libc::c_int == '\u{0}' as i32 {
          break 's_87;
        }
      }
      _ => {}
    }
    crate::libbb::appletlib::bb_show_usage();
  }
  /* Last checked to be compatible with: coreutils-6.10 */
  width = 0 as libc::c_uint;
  frac_part = 0 as libc::c_uint;
  loop {
    let mut dot: *mut libc::c_char = strchrnul(*argv, '.' as i32);
    let mut w: libc::c_int = dot.wrapping_offset_from(*argv) as libc::c_long as libc::c_int;
    let mut f: libc::c_int = strlen(dot) as libc::c_int;
    if width < w as libc::c_uint {
      width = w as libc::c_uint
    }
    argv = argv.offset(1);
    if (*argv).is_null() {
      break;
    }
    /* Why do the above _before_ frac check below?
     * Try "seq 1 2.0" and "seq 1.0 2.0":
     * coreutils never pay attention to the number
     * of fractional digits in last arg. */
    if frac_part < f as libc::c_uint {
      frac_part = f as libc::c_uint
    }
  } /* I/O error, bail out (yes, this really happens) */
  if frac_part != 0 {
    frac_part = frac_part.wrapping_sub(1);
    if frac_part != 0 {
      width = width.wrapping_add(frac_part.wrapping_add(1i32 as libc::c_uint))
    }
  }
  if opt & OPT_w as libc::c_int as libc::c_uint == 0 {
    width = 0 as libc::c_uint
  }
  sep = b"\x00" as *const u8 as *const libc::c_char;
  v = first;
  n = 0 as libc::c_uint;
  while if increment >= 0 as libc::c_double {
    (v <= last) as libc::c_int
  } else {
    (v >= last) as libc::c_int
  } != 0
  {
    if printf(
      b"%s%0*.*f\x00" as *const u8 as *const libc::c_char,
      sep,
      width,
      frac_part,
      v,
    ) < 0
    {
      break;
    }
    sep = opt_s;
    /* v += increment; - would accumulate floating point errors */
    n = n.wrapping_add(1);
    v = first + n as libc::c_double * increment
  }
  if n != 0 {
    /* if while loop executed at least once */
    crate::libbb::xfuncs_printf::bb_putchar('\n' as i32);
  }
  return crate::libbb::xfuncs_printf::fflush_all();
}