cxx/symbols/
rust_string.rs

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1#![cfg(feature = "alloc")]
2
3use alloc::borrow::ToOwned;
4use alloc::string::String;
5use core::mem::{ManuallyDrop, MaybeUninit};
6use core::ptr;
7use core::slice;
8use core::str;
9
10#[export_name = "cxxbridge1$string$new"]
11unsafe extern "C" fn string_new(this: &mut MaybeUninit<String>) {
12    let this = this.as_mut_ptr();
13    let new = String::new();
14    unsafe { ptr::write(this, new) }
15}
16
17#[export_name = "cxxbridge1$string$clone"]
18unsafe extern "C" fn string_clone(this: &mut MaybeUninit<String>, other: &String) {
19    let this = this.as_mut_ptr();
20    let clone = other.clone();
21    unsafe { ptr::write(this, clone) }
22}
23
24#[export_name = "cxxbridge1$string$from_utf8"]
25unsafe extern "C" fn string_from_utf8(
26    this: &mut MaybeUninit<String>,
27    ptr: *const u8,
28    len: usize,
29) -> bool {
30    let slice = unsafe { slice::from_raw_parts(ptr, len) };
31    match str::from_utf8(slice) {
32        Ok(s) => {
33            let this = this.as_mut_ptr();
34            let owned = s.to_owned();
35            unsafe { ptr::write(this, owned) }
36            true
37        }
38        Err(_) => false,
39    }
40}
41
42#[export_name = "cxxbridge1$string$from_utf8_lossy"]
43unsafe extern "C" fn string_from_utf8_lossy(
44    this: &mut MaybeUninit<String>,
45    ptr: *const u8,
46    len: usize,
47) {
48    let slice = unsafe { slice::from_raw_parts(ptr, len) };
49    let owned = String::from_utf8_lossy(slice).into_owned();
50    let this = this.as_mut_ptr();
51    unsafe { ptr::write(this, owned) }
52}
53
54#[export_name = "cxxbridge1$string$from_utf16"]
55unsafe extern "C" fn string_from_utf16(
56    this: &mut MaybeUninit<String>,
57    ptr: *const u16,
58    len: usize,
59) -> bool {
60    let slice = unsafe { slice::from_raw_parts(ptr, len) };
61    match String::from_utf16(slice) {
62        Ok(s) => {
63            let this = this.as_mut_ptr();
64            unsafe { ptr::write(this, s) }
65            true
66        }
67        Err(_) => false,
68    }
69}
70
71#[export_name = "cxxbridge1$string$from_utf16_lossy"]
72unsafe extern "C" fn string_from_utf16_lossy(
73    this: &mut MaybeUninit<String>,
74    ptr: *const u16,
75    len: usize,
76) {
77    let slice = unsafe { slice::from_raw_parts(ptr, len) };
78    let owned = String::from_utf16_lossy(slice);
79    let this = this.as_mut_ptr();
80    unsafe { ptr::write(this, owned) }
81}
82
83#[export_name = "cxxbridge1$string$drop"]
84unsafe extern "C" fn string_drop(this: &mut ManuallyDrop<String>) {
85    unsafe { ManuallyDrop::drop(this) }
86}
87
88#[export_name = "cxxbridge1$string$ptr"]
89unsafe extern "C" fn string_ptr(this: &String) -> *const u8 {
90    this.as_ptr()
91}
92
93#[export_name = "cxxbridge1$string$len"]
94unsafe extern "C" fn string_len(this: &String) -> usize {
95    this.len()
96}
97
98#[export_name = "cxxbridge1$string$capacity"]
99unsafe extern "C" fn string_capacity(this: &String) -> usize {
100    this.capacity()
101}
102
103#[export_name = "cxxbridge1$string$reserve_additional"]
104unsafe extern "C" fn string_reserve_additional(this: &mut String, additional: usize) {
105    this.reserve(additional);
106}
107
108#[export_name = "cxxbridge1$string$reserve_total"]
109unsafe extern "C" fn string_reserve_total(this: &mut String, new_cap: usize) {
110    if new_cap > this.capacity() {
111        let additional = new_cap - this.len();
112        this.reserve(additional);
113    }
114}
cxx/symbols/rust_string.rs

cxx/symbols/
rust_string.rs
