81 lines
2.2 KiB
Rust
81 lines
2.2 KiB
Rust
use crate::ffi::OsString;
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use crate::fmt;
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use crate::sys::os_str;
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use crate::sys::pal::{WORD_SIZE, abi};
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use crate::sys_common::FromInner;
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pub struct Args {
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i_forward: usize,
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i_back: usize,
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count: usize,
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}
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pub fn args() -> Args {
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let count = unsafe { abi::sys_argc() };
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Args { i_forward: 0, i_back: 0, count }
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}
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impl Args {
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/// Use sys_argv to get the arg at the requested index. Does not check that i is less than argc
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/// and will not return if the index is out of bounds.
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fn argv(i: usize) -> OsString {
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let arg_len = unsafe { abi::sys_argv(crate::ptr::null_mut(), 0, i) };
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let arg_len_words = (arg_len + WORD_SIZE - 1) / WORD_SIZE;
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let words = unsafe { abi::sys_alloc_words(arg_len_words) };
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let arg_len2 = unsafe { abi::sys_argv(words, arg_len_words, i) };
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debug_assert_eq!(arg_len, arg_len2);
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// Convert to OsString.
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//
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// FIXME: We can probably get rid of the extra copy here if we
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// reimplement "os_str" instead of just using the generic unix
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// "os_str".
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let arg_bytes: &[u8] =
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unsafe { crate::slice::from_raw_parts(words.cast() as *const u8, arg_len) };
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OsString::from_inner(os_str::Buf { inner: arg_bytes.to_vec() })
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}
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}
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impl fmt::Debug for Args {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_list().finish()
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}
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}
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impl Iterator for Args {
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type Item = OsString;
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fn next(&mut self) -> Option<OsString> {
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if self.i_forward >= self.count - self.i_back {
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None
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} else {
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let arg = Self::argv(self.i_forward);
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self.i_forward += 1;
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Some(arg)
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}
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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(self.count, Some(self.count))
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}
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}
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impl ExactSizeIterator for Args {
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fn len(&self) -> usize {
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self.count
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}
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}
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impl DoubleEndedIterator for Args {
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fn next_back(&mut self) -> Option<OsString> {
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if self.i_back >= self.count - self.i_forward {
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None
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} else {
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let arg = Self::argv(self.count - 1 - self.i_back);
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self.i_back += 1;
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Some(arg)
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}
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}
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}
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