fd

libuwuc/src/io/fd.rs

@@ -31,3 +31,9 @@ pub const O_NDELAY: i32 = O_NONBLOCK;
 pub const O_SYNC: i32 = 0o04010000;
 pub const O_FSYNC: i32 = O_SYNC;
 pub const O_ASYNC: i32 = 0o020000;
+
+pub const SEEK_SET: i32 = 0;
+pub const SEEK_CUR: i32 = 1;
+pub const SEEK_END: i32 = 2;
+pub const SEEK_DATA: i32 = 3;
+pub const SEEK_HOLE: i32 = 4;

libuwuc/src/io/mod.rs

@@ -47,6 +47,10 @@ pub unsafe fn sys_write(fd: Fd, buf: &[u8]) -> Result<usize, Error> {
     syscall::syscall!(syscall::SYS_WRITE, fd.0, buf.as_ptr(), buf.len()).syscall_resultify()
 }
 
+pub unsafe fn sys_lseek(fd: Fd, offset: i64, whence: i32) -> Result<i64, Error> {
+    syscall::syscall!(syscall::SYS_LSEEK, fd.0, offset, whence).syscall_resultify()
+}
+
 pub unsafe fn write_all(fd: Fd, mut buf: &[u8]) -> Result<(), Error> {
     while !buf.is_empty() {
         let result = sys_write(fd, buf)?;

libuwuc/src/io/stream/mod.rs

@@ -43,8 +43,8 @@ pub unsafe fn fopen<'a>(
     unsafe { Ok(&*alloc::boxed(FileStream { fd })) }
 }
 
-pub fn fputc(c: u8, stream: &FileStream) -> i32 {
-    match stream.write_byte(c) {
+pub fn fputc(c: i32, stream: &FileStream) -> i32 {
+    match stream.write_byte(c as u8) {
         Ok(_) => c as _,
         Err(_) => EOF,
     }

rawc/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [lib]
-crate-type = ["staticlib", "rlib", "cdylib"]
+crate-type = ["staticlib", "rlib"]
 
 
 [dependencies]

rawc/src/fcntl.rs

@@ -0,0 +1,6 @@
+use libuwuc::{error::IntoOkOrErrno, utils::SharedThinCstr, io::fd::Fd};
+
+#[no_mangle]
+pub unsafe extern "C" fn open(path: SharedThinCstr<'_>, flags: i32) -> Fd {
+    libuwuc::io::fd::open(path, flags).into_ok_or_errno()
+}

rawc/src/lib.rs

@@ -4,6 +4,7 @@
 #![deny(clippy::no_mangle_with_rust_abi)]
 #![warn(rust_2018_idioms)]
 
+mod fcntl;
 mod rt;
 mod stdio;
 mod stdlib;

rawc/src/stdio.rs

@@ -2,7 +2,7 @@ use core::ffi::{c_char, c_int};
 
 use libuwuc::{
     error::IntoOkOrErrno,
-    io::{fd::Fd, stream::FileStream, traits::WriteCounter, STDERR, STDIN, STDOUT},
+    io::{stream::FileStream, traits::WriteCounter, STDERR, STDIN, STDOUT},
     utils::SharedThinCstr,
 };
 
@@ -11,11 +11,9 @@ pub unsafe extern "C" fn puts(s: *const c_char) -> i32 {
     libuwuc::io::puts(s)
 }
 
-// RAW FD:
-
 #[no_mangle]
-pub unsafe extern "C" fn open(path: SharedThinCstr<'_>, flags: i32) -> Fd {
-    libuwuc::io::fd::open(path, flags).into_ok_or_errno()
+pub unsafe extern "C" fn putchar(char: i32) -> i32 {
+    libuwuc::io::stream::fputc(char, stdout)
 }
 
 // PRINTF:
@@ -108,7 +106,7 @@ pub unsafe extern "C" fn ungetc(_c: c_int, _stream: *mut FileStream) -> c_int {
 
 #[no_mangle]
 pub unsafe extern "C" fn fputc(c: c_int, stream: *mut FileStream) -> c_int {
-    libuwuc::io::stream::fputc(c as u8, &*stream)
+    libuwuc::io::stream::fputc(c, &*stream)
 }
 
 #[no_mangle]

rawc/src/unistd.rs

@@ -14,3 +14,8 @@ pub unsafe extern "C" fn write(fd: Fd, buf: *const u8, count: usize) -> isize {
         .map(|n| n as isize)
         .into_ok_or_errno()
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn lseek(fd: Fd, offset: i64, whence: i32) -> i64 {
+    libuwuc::io::sys_lseek(fd, offset, whence).into_ok_or_errno()
+}

tests/c/fd.c

@@ -0,0 +1,29 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <assert.h>
+
+int main(int argc, char *argv[])
+{
+    int alphabet = open("data/alphabet.txt", O_RDONLY);
+    assert(alphabet != -1 && "failed to open file");
+
+    off_t off;
+
+    off = lseek(alphabet, 10, SEEK_SET);
+    assert(off != -1 && "failed to seek file");
+
+    char buf[1];
+    ssize_t amount;
+
+    amount = read(alphabet, buf, 1);
+    assert(amount == 1 && "failed to read from alphabet");
+    assert(buf[0] == 'k' && "character at offest 10 is not k");
+
+
+    off = lseek(alphabet, 1, SEEK_CUR);
+    assert(off != -1 && "failed to seek file");
+
+    amount = read(alphabet, buf, 1);
+    assert(amount == 1 && "failed to read from alphabet");
+    assert(buf[0] == 'm' && "character at offest 12 is not m");
+}

tests/data/alphabet.txt

@@ -0,0 +1 @@
+abcdefghijklmnopqrstuvwxyz0123456