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port https://github.com/bytecodealliance/wasmtime/pull/2620 into rewrite

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This commit is contained in:
Pat Hickey
2021-02-01 11:10:26 -08:00
parent 92e1949944
commit bad169dde3
2 changed files with 6 additions and 8 deletions
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6
crates/test-programs/wasi-tests/src/bin/fd_readdir.rs
View File

@@ -1,5 +1,5 @@
use more_asserts::assert_gt;
use std::{cmp::min, env, mem, process, slice, str};
use std::{env, mem, process, slice, str};
use wasi_tests::open_scratch_directory;
const BUF_LEN: usize = 256;
@@ -58,8 +58,8 @@ unsafe fn exec_fd_readdir(fd: wasi::Fd, cookie: wasi::Dircookie) -> (Vec<DirEntr
let mut buf: [u8; BUF_LEN] = [0; BUF_LEN];
let bufused =
wasi::fd_readdir(fd, buf.as_mut_ptr(), BUF_LEN, cookie).expect("failed fd_readdir");
let sl = slice::from_raw_parts(buf.as_ptr(), min(BUF_LEN, bufused));
assert!(bufused <= BUF_LEN);
let sl = slice::from_raw_parts(buf.as_ptr(), bufused);
let dirs: Vec<_> = ReadDir::from_slice(sl).collect();
let eof = bufused < BUF_LEN;
(dirs, eof)

6
crates/wasi-common/src/snapshots/preview_1.rs
View File

@@ -650,9 +650,6 @@ impl<'a> wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
let dirent_len: types::Size = dirent_raw.len().try_into()?;
let name_raw = name.as_bytes();
let name_len: types::Size = name_raw.len().try_into()?;
let offset = dirent_len
.checked_add(name_len)
.ok_or_else(|| Error::overflow())?;
// Copy as many bytes of the dirent as we can, up to the end of the buffer
let dirent_copy_len = std::cmp::min(dirent_len, buf_len - bufused);
@@ -666,6 +663,7 @@ impl<'a> wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
}
buf = buf.add(dirent_copy_len)?;
bufused += dirent_copy_len;
// Copy as many bytes of the name as we can, up to the end of the buffer
let name_copy_len = std::cmp::min(name_len, buf_len - bufused);
@@ -680,7 +678,7 @@ impl<'a> wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
}
buf = buf.add(name_copy_len)?;
bufused += offset;
bufused += name_copy_len;
}
Ok(bufused)
}