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/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author notes
* 2025-10-10 foxglove micro rust log component
*/
use alloc::string::{String, ToString};
use alloc::ffi::CString;
use crate::RTResult;
use crate::RTTError::{FileCloseErr, FileFlushErr, FileOpenErr, FileReadErr, FileSeekErr, FileSetLengthErr, FileWriteErr};
use crate::bindings::libc;
use core::ffi::{c_void, c_int};
pub struct File {
pub fd: i32,
}
pub struct OpenOptions {
pub path: String,
pub read: bool,
pub write: bool,
pub create: bool,
pub append: bool,
pub truncate: bool,
}
impl OpenOptions {
pub fn new() -> Self {
Self { path: String::new(), read: false, write: false, create: false, append: false, truncate: false }
}
pub fn read(&mut self, read: bool) -> &mut Self { self.read = read; self }
pub fn write(&mut self, write: bool) -> &mut Self { self.write = write; self }
pub fn create(&mut self, create: bool) -> &mut Self { self.create = create; self }
pub fn append(&mut self, append: bool) -> &mut Self { self.append = append; self }
pub fn truncate(&mut self, truncate: bool) -> &mut Self { self.truncate = truncate; self }
fn flags(&self) -> c_int {
let mut flags: c_int = 0;
flags |= if self.read && self.write { libc::O_RDWR } else if self.write { libc::O_WRONLY } else { libc::O_RDONLY };
if self.create { flags |= libc::O_CREAT; }
if self.append { flags |= libc::O_APPEND; }
if self.truncate { flags |= libc::O_TRUNC; }
flags
}
pub fn open(&mut self, path: &str) -> RTResult<File> {
self.path = path.to_string();
let cpath = match CString::new(self.path.clone()) { Ok(s) => s, Err(_) => return Err(FileOpenErr) };
let oflags = self.flags();
let fd = unsafe { libc::open(cpath.as_ptr(), oflags, 0o666 as c_int) };
if fd < 0 { Err(FileOpenErr) } else { Ok(File { fd }) }
}
}
impl Drop for File {
fn drop(&mut self) {
unsafe { libc::close(self.fd); }
}
}
impl File {
pub fn read_to_string(&self) -> RTResult<String> {
let mut buf = [0u8; 256];
let mut out = String::new();
self.seek(0)?;
loop {
let n = self.read(&mut buf)?;
if n == 0 { break; }
let s = alloc::string::String::from_utf8_lossy(&buf[..n]).into_owned();
out.push_str(&s);
}
Ok(out)
}
pub fn write_all(&self, buf: &str) -> RTResult<()> {
let mut written = 0usize;
let bytes = buf.as_bytes();
while written < bytes.len() {
let n = self.write(&bytes[written..])?;
written += n;
}
Ok(())
}
pub fn read(&self, buf: &mut [u8]) -> RTResult<usize> {
let n = unsafe { libc::read(self.fd, buf.as_mut_ptr() as *mut c_void, buf.len() as libc::size_t) };
if n < 0 { Err(FileReadErr) } else { Ok(n as usize) }
}
pub fn write(&self, buf: &[u8]) -> RTResult<usize> {
let n = unsafe { libc::write(self.fd, buf.as_ptr() as *const c_void, buf.len() as libc::size_t) };
if n < 0 { Err(FileWriteErr) } else { Ok(n as usize) }
}
pub fn seek(&self, offset: i64) -> RTResult<i64> {
let n = unsafe { libc::lseek(self.fd, offset as libc::off_t, libc::SEEK_SET) };
if n < 0 { Err(FileSeekErr) } else { Ok(n.into()) }
}
pub fn flush(&self) -> RTResult<()> {
let n = unsafe { libc::fsync(self.fd) };
if n < 0 { Err(FileFlushErr) } else { Ok(()) }
}
pub fn set_len(&self, len: i64) -> RTResult<()> {
let n = unsafe { libc::ftruncate(self.fd, len as libc::off_t) };
if n < 0 { Err(FileSetLengthErr) } else { Ok(()) }
}
pub fn close(&self) -> RTResult<()> {
let n = unsafe { libc::close(self.fd) };
if n < 0 { Err(FileCloseErr) } else { Ok(()) }
}
}
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