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