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update cursor in file when writing to it

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This commit is contained in:
Mark McCaskey 2019-04-02 12:11:05 -07:00
parent 04a80739e1
commit a4547e36e2
1 changed files with 11 additions and 5 deletions
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16
lib/wasi/src/syscalls/mod.rs
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@ -619,7 +619,6 @@ pub fn fd_write(
) -> __wasi_errno_t {
debug!("wasi::fd_write: fd={}", fd);
let memory = ctx.memory(0);
// TODO: check __WASI_RIGHT_FD_WRITE
let iovs_arr_cell = wasi_try!(iovs.deref(memory, 0, iovs_len));
let nwritten_cell = wasi_try!(nwritten.deref(memory));
@ -659,24 +658,31 @@ pub fn fd_write(
}
_ => {
let state = get_wasi_state(ctx);
let fd_entry = wasi_try!(state.fs.fd_map.get(&fd).ok_or(__WASI_EBADF));
let fd_entry = wasi_try!(state.fs.fd_map.get_mut(&fd).ok_or(__WASI_EBADF));
if fd_entry.rights & __WASI_RIGHT_FD_WRITE == 0 {
// TODO: figure out the error to return when lacking rights
return __WASI_EACCES;
}
let offset = fd_entry.offset as usize;
let inode = &mut state.fs.inodes[fd_entry.inode];
match &mut inode.kind {
let bytes_written = match &mut inode.kind {
Kind::File { handle } => wasi_try!(write_bytes(handle, memory, iovs_arr_cell)),
Kind::Dir { .. } => {
// TODO: verify
return __WASI_EISDIR;
}
Kind::Symlink { .. } => unimplemented!(),
Kind::Buffer { buffer } => wasi_try!(write_bytes(buffer, memory, iovs_arr_cell)),
}
Kind::Buffer { buffer } => {
wasi_try!(write_bytes(&mut buffer[offset..], memory, iovs_arr_cell))
}
};
fd_entry.offset += bytes_written as u64;
bytes_written
}
};