      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226

    // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Global initialization and retrieval of command line arguments.
    //!
    //! On some platforms these are stored during runtime startup,
    //! and on some they are retrieved from the system on demand.

    #![allow(dead_code)] // runtime init functions not used during testing

    use ffi::OsString;
    use marker::PhantomData;
    use vec;

    /// One-time global initialization.
    pub unsafe fn init(argc: isize, argv: *const *const u8) { imp::init(argc, argv) }

    /// One-time global cleanup.
    pub unsafe fn cleanup() { imp::cleanup() }

    /// Returns the command line arguments
    pub fn args() -> Args {
        imp::args()
    }

    pub struct Args {
        iter: vec::IntoIter<OsString>,
        _dont_send_or_sync_me: PhantomData<*mut ()>,
    }

    impl Args {
        pub fn inner_debug(&self) -> &[OsString] {
            self.iter.as_slice()
        }
    }

    impl Iterator for Args {
        type Item = OsString;
        fn next(&mut self) -> Option<OsString> { self.iter.next() }
        fn size_hint(&self) -> (usize, Option<usize>) { self.iter.size_hint() }
    }

    impl ExactSizeIterator for Args {
        fn len(&self) -> usize { self.iter.len() }
    }

    impl DoubleEndedIterator for Args {
        fn next_back(&mut self) -> Option<OsString> { self.iter.next_back() }
    }

    #[cfg(any(target_os = "linux",
              target_os = "android",
              target_os = "freebsd",
              target_os = "dragonfly",
              target_os = "bitrig",
              target_os = "netbsd",
              target_os = "openbsd",
              target_os = "solaris",
              target_os = "emscripten",
              target_os = "haiku",
              target_os = "fuchsia"))]
    mod imp {
        use os::unix::prelude::*;
        use mem;
        use ffi::{CStr, OsString};
        use marker::PhantomData;
        use libc;
        use super::Args;

        use sys_common::mutex::Mutex;

        static mut GLOBAL_ARGS_PTR: usize = 0;
        static LOCK: Mutex = Mutex::new();

        pub unsafe fn init(argc: isize, argv: *const *const u8) {
            let args = (0..argc).map(|i| {
                CStr::from_ptr(*argv.offset(i) as *const libc::c_char).to_bytes().to_vec()
            }).collect();

            LOCK.lock();
            let ptr = get_global_ptr();
            assert!((*ptr).is_none());
            (*ptr) = Some(box args);
            LOCK.unlock();
        }

        pub unsafe fn cleanup() {
            LOCK.lock();
            *get_global_ptr() = None;
            LOCK.unlock();
        }

        pub fn args() -> Args {
            let bytes = clone().unwrap_or(Vec::new());
            let v: Vec<OsString> = bytes.into_iter().map(|v| {
                OsStringExt::from_vec(v)
            }).collect();
            Args { iter: v.into_iter(), _dont_send_or_sync_me: PhantomData }
        }

        fn clone() -> Option<Vec<Vec<u8>>> {
            unsafe {
                LOCK.lock();
                let ptr = get_global_ptr();
                let ret = (*ptr).as_ref().map(|s| (**s).clone());
                LOCK.unlock();
                return ret
            }
        }

        fn get_global_ptr() -> *mut Option<Box<Vec<Vec<u8>>>> {
            unsafe { mem::transmute(&GLOBAL_ARGS_PTR) }
        }

    }

    #[cfg(any(target_os = "macos",
              target_os = "ios"))]
    mod imp {
        use ffi::CStr;
        use marker::PhantomData;
        use libc;
        use super::Args;

        pub unsafe fn init(_argc: isize, _argv: *const *const u8) {
        }

        pub fn cleanup() {
        }

        #[cfg(target_os = "macos")]
        pub fn args() -> Args {
            use os::unix::prelude::*;
            extern {
                // These functions are in crt_externs.h.
                fn _NSGetArgc() -> *mut libc::c_int;
                fn _NSGetArgv() -> *mut *mut *mut libc::c_char;
            }

            let vec = unsafe {
                let (argc, argv) = (*_NSGetArgc() as isize,
                                    *_NSGetArgv() as *const *const libc::c_char);
                (0.. argc as isize).map(|i| {
                    let bytes = CStr::from_ptr(*argv.offset(i)).to_bytes().to_vec();
                    OsStringExt::from_vec(bytes)
                }).collect::<Vec<_>>()
            };
            Args {
                iter: vec.into_iter(),
                _dont_send_or_sync_me: PhantomData,
            }
        }

        // As _NSGetArgc and _NSGetArgv aren't mentioned in iOS docs
        // and use underscores in their names - they're most probably
        // are considered private and therefore should be avoided
        // Here is another way to get arguments using Objective C
        // runtime
        //
        // In general it looks like:
        // res = Vec::new()
        // let args = [[NSProcessInfo processInfo] arguments]
        // for i in (0..[args count])
        //      res.push([args objectAtIndex:i])
        // res
        #[cfg(target_os = "ios")]
        pub fn args() -> Args {
            use ffi::OsString;
            use mem;
            use str;

            extern {
                fn sel_registerName(name: *const libc::c_uchar) -> Sel;
                fn objc_getClass(class_name: *const libc::c_uchar) -> NsId;
            }

            #[cfg(target_arch="aarch64")]
            extern {
                fn objc_msgSend(obj: NsId, sel: Sel) -> NsId;
                #[link_name="objc_msgSend"]
                fn objc_msgSend_ul(obj: NsId, sel: Sel, i: libc::c_ulong) -> NsId;
            }

            #[cfg(not(target_arch="aarch64"))]
            extern {
                fn objc_msgSend(obj: NsId, sel: Sel, ...) -> NsId;
                #[link_name="objc_msgSend"]
                fn objc_msgSend_ul(obj: NsId, sel: Sel, ...) -> NsId;
            }

            type Sel = *const libc::c_void;
            type NsId = *const libc::c_void;

            let mut res = Vec::new();

            unsafe {
                let process_info_sel = sel_registerName("processInfo\0".as_ptr());
                let arguments_sel = sel_registerName("arguments\0".as_ptr());
                let utf8_sel = sel_registerName("UTF8String\0".as_ptr());
                let count_sel = sel_registerName("count\0".as_ptr());
                let object_at_sel = sel_registerName("objectAtIndex:\0".as_ptr());

                let klass = objc_getClass("NSProcessInfo\0".as_ptr());
                let info = objc_msgSend(klass, process_info_sel);
                let args = objc_msgSend(info, arguments_sel);

                let cnt: usize = mem::transmute(objc_msgSend(args, count_sel));
                for i in 0..cnt {
                    let tmp = objc_msgSend_ul(args, object_at_sel, i as libc::c_ulong);
                    let utf_c_str: *const libc::c_char =
                        mem::transmute(objc_msgSend(tmp, utf8_sel));
                    let bytes = CStr::from_ptr(utf_c_str).to_bytes();
                    res.push(OsString::from(str::from_utf8(bytes).unwrap()))
                }
            }

            Args { iter: res.into_iter(), _dont_send_or_sync_me: PhantomData }
        }
    }

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)