mirror of
https://github.com/denoland/deno.git
synced 2024-11-23 15:16:54 -05:00
44 lines
1.7 KiB
Rust
44 lines
1.7 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
|
|
//! This module wraps libdeno::deno_set_v8_flags
|
|
use crate::libdeno::deno_set_v8_flags;
|
|
use libc::c_char;
|
|
use libc::c_int;
|
|
use std::ffi::CStr;
|
|
use std::ffi::CString;
|
|
use std::vec::Vec;
|
|
|
|
/// Pass the command line arguments to v8.
|
|
/// Returns a vector of command line arguments that V8 did not understand.
|
|
pub fn v8_set_flags(args: Vec<String>) -> Vec<String> {
|
|
// deno_set_v8_flags(int* argc, char** argv) mutates argc and argv to remove
|
|
// flags that v8 understands.
|
|
|
|
// Make a new array, that can be modified by V8::SetFlagsFromCommandLine(),
|
|
// containing mutable raw pointers to the individual command line args.
|
|
let mut raw_argv = args
|
|
.iter()
|
|
.map(|arg| CString::new(arg.as_str()).unwrap().into_bytes_with_nul())
|
|
.collect::<Vec<_>>();
|
|
let mut c_argv = raw_argv
|
|
.iter_mut()
|
|
.map(|arg| arg.as_mut_ptr() as *mut c_char)
|
|
.collect::<Vec<_>>();
|
|
|
|
// Store the length of the c_argv array in a local variable. We'll pass
|
|
// a pointer to this local variable to deno_set_v8_flags(), which then
|
|
// updates its value.
|
|
let mut c_argv_len = c_argv.len() as c_int;
|
|
// Let v8 parse the arguments it recognizes and remove them from c_argv.
|
|
unsafe { deno_set_v8_flags(&mut c_argv_len, c_argv.as_mut_ptr()) };
|
|
// If c_argv_len was updated we have to change the length of c_argv to match.
|
|
c_argv.truncate(c_argv_len as usize);
|
|
// Copy the modified arguments list into a proper rust vec and return it.
|
|
c_argv
|
|
.iter()
|
|
.map(|ptr| unsafe {
|
|
let cstr = CStr::from_ptr(*ptr as *const c_char);
|
|
let slice = cstr.to_str().unwrap();
|
|
slice.to_string()
|
|
})
|
|
.collect()
|
|
}
|