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implement wasi::readlink

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This commit is contained in:
Mark McCaskey
2019-07-12 15:58:28 -07:00
parent bd2a082a78
commit 5119f07ea3
3 changed files with 37 additions and 1 deletions
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9
lib/runtime-core/src/memory/ptr.rs
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@ -126,6 +126,15 @@ impl<T: Copy + ValueType> WasmPtr<T, Array> {
[index as usize..slice_full_len];
Some(cell_ptrs)
}
pub fn get_utf8_string<'a>(self, memory: &'a Memory, str_len: u32) -> Option<&'a str> {
if self.offset as usize + str_len as usize > memory.size().bytes().0 {
return None;
}
let ptr = unsafe { memory.view::<u8>().as_ptr().add(self.offset as usize) as *const u8 };
let slice: &[u8] = unsafe { std::slice::from_raw_parts(ptr, str_len as usize) };
std::str::from_utf8(slice).ok()
}
}
unsafe impl<T: Copy, Ty> WasmExternType for WasmPtr<T, Ty> {