minxp 0.1.7

Partial reimplementation of std for no-std on unsupported Windows targets.
Documentation 
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use alloc::string::String;
use windows_sys::core::{PCWSTR, PWSTR};
use windows_sys::Win32::Foundation::LocalFree;
use windows_sys::Win32::System::Environment::GetCommandLineW;
use windows_sys::Win32::UI::Shell::CommandLineToArgvW;
use crate::ffi::OsString;
use crate::util::{get_last_windows_error, utf16_ptr_to_slice};

macro_rules! make_args_iterator {
    ($name:tt, $string:ty) => {
        pub struct $name {
            argv: *mut PWSTR,
            argc: usize,
            current_index_front: usize,
            current_index_back: usize
        }

        impl $name {
            unsafe fn new(command_line: PCWSTR) -> Self {
                let err = get_last_windows_error();
                assert!(!command_line.is_null(), "command_line is NULL: {err}");

                let mut argc: i32 = 0;

                // Safety: This string should be from GetCommandLineW
                let argv = unsafe { CommandLineToArgvW(command_line, &mut argc) };
                let argc = argc as usize;

                let err = get_last_windows_error();
                assert!(!argv.is_null(), "CommandLineToArgvW was NULL: {err}");

                Self {
                    current_index_front: 0,
                    current_index_back: argc,
                    argc,
                    argv
                }
            }
            fn get(&self, index: usize) -> $string {
                assert!(index < self.argc);
                unsafe {
                    let argument: *const u16 = *self.argv.wrapping_add(index);

                    // Safety: This is from CommandLineToArgvW, and we're within `argc`
                    String::from_utf16(utf16_ptr_to_slice(argument)).expect("non-utf16 string gotten").into()
                }
            }
        }

        impl Iterator for $name {
            type Item = $string;
            fn next(&mut self) -> Option<Self::Item> {
                if self.current_index_front < self.argc {
                    let arg = self.get(self.current_index_front);
                    self.current_index_front += 1;
                    Some(arg)
                }
                else {
                    None
                }
            }
        }

        impl DoubleEndedIterator for $name {
            fn next_back(&mut self) -> Option<Self::Item> {
                if self.current_index_back > 0 {
                    self.current_index_back -= 1;
                    let arg = self.get(self.current_index_back);
                    Some(arg)
                }
                else {
                    None
                }
            }
        }

        impl Drop for $name {
            fn drop(&mut self) {
                unsafe {
                    LocalFree(self.argv as _);
                }
            }
        }

    };
}

make_args_iterator!(Args, String);

pub fn args() -> Args {
    unsafe {
        Args::new(GetCommandLineW())
    }
}


make_args_iterator!(ArgsOs, OsString);

pub fn args_os() -> ArgsOs {
    unsafe {
        ArgsOs::new(GetCommandLineW())
    }
}