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Use another language to call a function: Difference between revisions
Use another language to call a function (view source)
Revision as of 13:08, 11 April 2021
, 3 years agoAdd Rust implementation
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rm_f %w[callruby main.o query-rb.o]
end</lang>
=={{header|Rust}}==
<lang rust>
//! In order to run this task, you will need to compile the C program locating in the task linked
//! above. The C program will need to be linked with the library produced by this file.
//!
//! 1. Compile this library:
//!
//! ```bash
//! $ cargo build --release
//! ```
//!
//! 2. Copy the C program into query.c.
//! 3. Compile and link the C program with the produced library:
//!
//! ```bash
//! $ LD_LIBRARY_PATH=/path/to/library gcc query.c -o query -Wall -Werror libquery
//! ```
//! 4. Run the resulting binary.
//!
//! ```bash
//! $ LD_LIBRARY_PATH=/path/to/library ./query
//! Here am I
//! ```
#![crate_type = "cdylib"]
extern crate libc;
use std::ffi::CString;
use libc::{c_char, c_int, size_t};
#[no_mangle]
#[allow(non_snake_case)]
#[allow(clippy::missing_safety_doc)]
pub unsafe extern "C" fn Query(data: *mut c_char, length: *mut size_t) -> c_int {
let string = "Here am I";
if *length + 1 < string.len() {
0
} else {
let c_string = CString::new(string).unwrap();
libc::strcpy(data, c_string.as_ptr());
*length = string.len();
1
}
}
</lang>
=={{header|Scala}}==
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