如何创建静态 C 字符串？

Question

我想在 Rust 中创建一个插件模块（共享库），它导出一个包含静态 C 字符串的 C 兼容结构。 2014 年 9 月，this Stack Overflow question determined it wasn't possible. As of Jan 2015 this still was not possible as per this Reddit thread。自那以后有什么变化吗？

Answer 1

以下似乎可以解决问题。我真的不希望该结构可变，但如果我不将其标记为 mut，我会收到 core::marker::Sync 错误。

extern crate libc;

use libc::funcs::c95::stdio::puts;
use std::mem;

pub struct Mystruct {
    s1: *const u8,
    s2: *const u8,
}

const CONST_C_STR: *const u8 = b"a constant c string[=10=]" as *const u8;

#[no_mangle]
pub static mut mystaticstruct: Mystruct = Mystruct {
    s1: CONST_C_STR,
    s2: b"another constant c string[=10=]" as *const u8
};

fn main() {
    unsafe{
        puts(mystaticstruct.s1 as *const i8); // puts likes i8
        puts(mystaticstruct.s2 as *const i8);
        println!("Mystruct size {}", mem::size_of_val(&mystaticstruct));
    }
}

输出（64 位linux）是...

a constant c string
another constant c string
Mystruct size 16

如何创建静态 C 字符串？

How do I create static C strings?

string

static

ffi

rust