Method write_to_guest

crates/wasi-common/src/string_array.rs:48–74

(
        &self,
        memory: &mut GuestMemory<'_>,
        buffer: GuestPtr<u8>,
        element_heads: GuestPtr<GuestPtr<u8>>,
    )

    }

    pub fn write_to_guest(
        &self,
        memory: &mut GuestMemory<'_>,
        buffer: GuestPtr<u8>,
        element_heads: GuestPtr<GuestPtr<u8>>,
    ) -> Result<(), Error> {
        let element_heads = element_heads.as_array(self.number_elements());
        let buffer = buffer.as_array(self.cumulative_size());
        let mut cursor = 0;
        for (elem, head) in self.elems.iter().zip(element_heads.iter()) {
            let bytes = elem.as_bytes();
            let len = bytes.len() as u32;
            {
                let elem_buffer = buffer
                    .get_range(cursor..(cursor + len))
                    .ok_or(Error::invalid_argument())?; // Elements don't fit in buffer provided
                memory.copy_from_slice(bytes, elem_buffer)?;
            }
            memory.write(
                buffer.get(cursor + len).ok_or(Error::invalid_argument())?,
                0,
            )?; // 0 terminate
            memory.write(head?, buffer.get(cursor).expect("already validated"))?;
            cursor += len + 1;
        }
        Ok(())
    }
}