Nicolás Antinori
54 lines
1.1 KiB
Rust
54 lines
1.1 KiB
Rust
use super::{fseek_locked, ftell_locked, FILE, SEEK_SET};
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use crate::{
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io::Read,
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platform::types::{off_t, wint_t},
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};
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struct LookAheadBuffer {
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buf: *const wint_t,
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pos: isize,
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look_ahead: isize,
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}
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impl LookAheadBuffer {
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fn look_ahead(&mut self) -> Result<Option<wint_t>, i32> {
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let wchar = unsafe { *self.buf.offset(self.look_ahead) };
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if wchar == 0 {
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Ok(None)
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} else {
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self.look_ahead += 1;
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Ok(Some(wchar))
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}
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}
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fn commit(&mut self) {
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self.pos = self.look_ahead;
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}
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}
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impl From<*const wint_t> for LookAheadBuffer {
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fn from(buff: *const wint_t) -> LookAheadBuffer {
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LookAheadBuffer {
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buf: buff,
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pos: 0,
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look_ahead: 0,
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}
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}
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}
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pub struct LookAheadReader(LookAheadBuffer);
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impl LookAheadReader {
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pub fn lookahead1(&mut self) -> Result<Option<wint_t>, i32> {
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self.0.look_ahead()
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}
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pub fn commit(&mut self) {
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self.0.commit()
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}
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}
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impl From<*const wint_t> for LookAheadReader {
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fn from(buff: *const wint_t) -> LookAheadReader {
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LookAheadReader(buff.into())
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}
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}
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