Peter Limkilde Svendsen
83 lines
2.0 KiB
Rust
83 lines
2.0 KiB
Rust
use alloc::boxed::Box;
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use super::{constants::*, Buffer, FILE};
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use crate::{
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fs::File,
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header::{errno, fcntl::*, string::strchr},
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io::BufWriter,
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platform::{self, types::*},
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sync::Mutex,
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};
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use alloc::vec::Vec;
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/// Parse mode flags as a string and output a mode flags integer
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pub unsafe fn parse_mode_flags(mode_str: *const c_char) -> i32 {
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let mut flags = if !strchr(mode_str, b'+' as i32).is_null() {
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O_RDWR
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} else if (*mode_str) == b'r' as i8 {
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O_RDONLY
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} else {
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O_WRONLY
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};
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if !strchr(mode_str, b'x' as i32).is_null() {
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flags |= O_EXCL;
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}
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if !strchr(mode_str, b'e' as i32).is_null() {
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flags |= O_CLOEXEC;
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}
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if (*mode_str) != b'r' as i8 {
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flags |= O_CREAT;
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}
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if (*mode_str) == b'w' as i8 {
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flags |= O_TRUNC;
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} else if (*mode_str) == b'a' as i8 {
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flags |= O_APPEND;
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}
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flags
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}
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/// Open a file with the file descriptor `fd` in the mode `mode`
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pub unsafe fn _fdopen(fd: c_int, mode: *const c_char) -> Option<*mut FILE> {
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if *mode != b'r' as i8 && *mode != b'w' as i8 && *mode != b'a' as i8 {
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platform::ERRNO.set(errno::EINVAL);
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return None;
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}
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let mut flags = 0;
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if strchr(mode, b'+' as i32).is_null() {
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flags |= if *mode == b'r' as i8 { F_NOWR } else { F_NORD };
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}
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if !strchr(mode, b'e' as i32).is_null() {
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fcntl(fd, F_SETFD, FD_CLOEXEC as c_ulonglong);
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}
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if *mode == 'a' as i8 {
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let f = fcntl(fd, F_GETFL, 0);
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if (f & O_APPEND) == 0 {
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fcntl(fd, F_SETFL, (f | O_APPEND) as c_ulonglong);
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}
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flags |= F_APP;
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}
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let file = File::new(fd);
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let writer = Box::new(BufWriter::new(file.get_ref()));
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Some(Box::into_raw(Box::new(FILE {
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lock: Mutex::new(()),
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file,
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flags,
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read_buf: Buffer::Owned(vec![0; BUFSIZ as usize]),
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read_pos: 0,
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read_size: 0,
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unget: Vec::new(),
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writer,
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pid: None,
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orientation: 0,
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})))
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}
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