frontend 0.4.0

rustc's frontend with no LLVM and no std: parsing through MIR, as a library
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// `#![no_std]`: these arrive with the standard prelude and name no path, so a `std::`
// search cannot see them - and a `#[derive]` can use them without the name appearing
// in this file at all, which is why they are not trimmed by inspection.
use alloc::borrow::ToOwned;
use alloc::boxed::Box;
use alloc::format;
use alloc::string::{String, ToString};
use alloc::vec;
use alloc::vec::Vec;

use super::*;
// `super::*` brings `core::ffi`, which has `CStr` but not the owned `CString`. `alloc::ffi`
// has it, under the same name, so `ffi::CString` below reads as it did upstream.
use alloc::ffi;

#[test]
fn short() {
    const TEXT: &str = "abcd";
    let reference = ffi::CString::new(TEXT.to_string()).unwrap();

    let scs = SmallCStr::new(TEXT);

    assert_eq!(scs.len_with_nul(), TEXT.len() + 1);
    assert_eq!(scs.as_c_str(), reference.as_c_str());
    assert!(!scs.spilled());
}

#[test]
fn empty() {
    const TEXT: &str = "";
    let reference = ffi::CString::new(TEXT.to_string()).unwrap();

    let scs = SmallCStr::new(TEXT);

    assert_eq!(scs.len_with_nul(), TEXT.len() + 1);
    assert_eq!(scs.as_c_str(), reference.as_c_str());
    assert!(!scs.spilled());
}

#[test]
fn long() {
    const TEXT: &str = "01234567890123456789012345678901234567890123456789\
                        01234567890123456789012345678901234567890123456789\
                        01234567890123456789012345678901234567890123456789";
    let reference = ffi::CString::new(TEXT.to_string()).unwrap();

    let scs = SmallCStr::new(TEXT);

    assert_eq!(scs.len_with_nul(), TEXT.len() + 1);
    assert_eq!(scs.as_c_str(), reference.as_c_str());
    assert!(scs.spilled());
}

#[test]
#[should_panic]
fn internal_nul() {
    let _ = SmallCStr::new("abcd\0def");
}

#[test]
fn from_cstr() {
    let c = c"foo";
    let s: SmallCStr = c.into();
    assert_eq!(s.len_with_nul(), 4);
    assert_eq!(s.as_c_str(), c"foo");
}