extern {
    fn strcmp(__s1 : *const u8, __s2 : *const u8) -> i32;
    fn strcspn(__s : *const u8, __charset : *const u8) -> usize;
    fn strncmp(__s1 : *const u8, __s2 : *const u8, __n : usize) -> i32;
    fn strspn(__s : *const u8, __charset : *const u8) -> usize;
}

unsafe extern fn my_strverscmp(
    mut s1 : *const u8, mut s2 : *const u8
) -> i32 {
    let mut _currentBlock;
    static mut digits : *const u8 = (*b"0123456789\0").as_ptr();
    let mut p1 : usize;
    let mut p2 : usize;
    p1 = strcspn(s1,digits);
    p2 = strcspn(s2,digits);
    'loop1: loop {
        if !(p1 == p2 && (*s1.offset(
                               p1 as (isize)
                           ) as (i32) != b'\0' as (i32)) && (*s2.offset(
                                                                  p2 as (isize)
                                                              ) as (i32) != b'\0' as (i32))) {
            _currentBlock = 2;
            break;
        }
        let mut ret : i32;
        let mut lz1 : i32;
        let mut lz2 : i32;
        if {
               ret = strncmp(s1,s2,p1);
               ret
           } != 0i32 {
            _currentBlock = 37;
            break;
        }
        s1 = s1.offset(p1 as (isize));
        s2 = s2.offset(p2 as (isize));
        lz1 = {
                  lz2 = 0i32;
                  lz2
              };
        if *s1 as (i32) == b'0' as (i32) {
            lz1 = 1i32;
        }
        if *s2 as (i32) == b'0' as (i32) {
            lz2 = 1i32;
        }
        if lz1 > lz2 {
            _currentBlock = 36;
            break;
        }
        if lz1 < lz2 {
            _currentBlock = 35;
            break;
        }
        if lz1 == 1i32 {
            _currentBlock = 11;
        } else {
            _currentBlock = 23;
        }
        'loop11: loop {
            if _currentBlock == 11 {
                if *s1 as (i32) == b'0' as (i32) && (*s2 as (i32) == b'0' as (i32)) {
                    s1 = s1.offset(1isize);
                    s2 = s2.offset(1isize);
                    _currentBlock = 11;
                } else {
                    p1 = strspn(s1,digits);
                    p2 = strspn(s2,digits);
                    if p1 == 0usize && (p2 > 0usize) {
                        _currentBlock = 33;
                        break 'loop1;
                    }
                    if p2 == 0usize && (p1 > 0usize) {
                        _currentBlock = 32;
                        break 'loop1;
                    }
                    if *s1 as (i32) != *s2 as (i32) && (*s1 as (i32) != b'0' as (i32)) && (*s2 as (i32) != b'0' as (i32)) {
                        if p1 < p2 {
                            _currentBlock = 31;
                            break 'loop1;
                        }
                        if p1 > p2 {
                            _currentBlock = 30;
                            break 'loop1;
                        } else {
                            _currentBlock = 23;
                        }
                    } else {
                        if p1 < p2 {
                            ret = strncmp(s1,s2,p1);
                        } else if p1 > p2 {
                            ret = strncmp(s1,s2,p2);
                        }
                        if ret != 0i32 {
                            _currentBlock = 20;
                            break 'loop1;
                        } else {
                            _currentBlock = 23;
                        }
                    }
                }
            } else {
                p1 = strspn(s1,digits);
                p2 = strspn(s2,digits);
                if p1 < p2 {
                    _currentBlock = 29;
                    break 'loop1;
                } else {
                    break;
                }
            }
        }
        if p1 > p2 {
            _currentBlock = 28;
            break;
        }
        if {
               ret = strncmp(s1,s2,p1);
               ret
           } != 0i32 {
            _currentBlock = 27;
            break;
        }
        s1 = s1.offset(p1 as (isize));
        s2 = s2.offset(p2 as (isize));
        p1 = strcspn(s1,digits);
        p2 = strcspn(s2,digits);
    }
    if _currentBlock == 2 {
        strcmp(s1,s2)
    } else if _currentBlock == 20 {
        ret
    } else if _currentBlock == 27 {
        ret
    } else if _currentBlock == 28 {
        1i32
    } else if _currentBlock == 29 {
        -1i32
    } else if _currentBlock == 30 {
        -1i32
    } else if _currentBlock == 31 {
        1i32
    } else if _currentBlock == 32 {
        -1i32
    } else if _currentBlock == 33 {
        1i32
    } else if _currentBlock == 35 {
        1i32
    } else if _currentBlock == 36 {
        -1i32
    } else {
        ret
    }
}

#[no_mangle]
pub unsafe extern fn ykpiv_check_version(
    mut req_version : *const u8
) -> *const u8 {
    if req_version.is_null() || my_strverscmp(
                                    req_version,
                                    (*b"@VERSION@\0").as_ptr()
                                ) <= 0i32 {
        (*b"@VERSION@\0").as_ptr()
    } else {
        0i32 as (*mut ::std::os::raw::c_void) as (*const u8)
    }
}