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Remove unnecessary lseek syscall when using std::fs::read

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This commit is contained in:
yukang 2023-01-08 05:02:04 +08:00
parent 2afe58571e
commit eae615dfdd
1 changed files with 6 additions and 2 deletions
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8
library/std/src/fs.rs
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@ -250,7 +250,9 @@ pub fn read<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
fn inner(path: &Path) -> io::Result<Vec<u8>> {
let mut file = File::open(path)?;
let mut bytes = Vec::new();
file.read_to_end(&mut bytes)?;
let size = file.metadata().map(|m| m.len()).unwrap_or(0);
bytes.reserve(size as usize);
io::default_read_to_end(&mut file, &mut bytes)?;
Ok(bytes)
}
inner(path.as_ref())
@ -289,7 +291,9 @@ pub fn read_to_string<P: AsRef<Path>>(path: P) -> io::Result<String> {
fn inner(path: &Path) -> io::Result<String> {
let mut file = File::open(path)?;
let mut string = String::new();
file.read_to_string(&mut string)?;
let size = file.metadata().map(|m| m.len()).unwrap_or(0);
string.reserve(size as usize);
io::default_read_to_string(&mut file, &mut string)?;
Ok(string)
}
inner(path.as_ref())