Function readAsync

Platforms/emscripten/web_example_pyrepl_jspi/src.mjs:125–137

(stream, buffer, offset, length, pos /* ignored */)

const tty_stream_ops = {
  async readAsync(stream, buffer, offset, length, pos /* ignored */) {
    let readBytes = PTY.read(length);
    if (length && !readBytes.length) {
      const status = await waitForReadable(-1);
      if (status === waitResult.READY) {
        readBytes = PTY.read(length);
      } else {
        throw new Error("Not implemented");
      }
    }
    buffer.set(readBytes, offset);
    return readBytes.length;
  },

  write: (stream, buffer, offset, length) => {
    // Note: default `buffer` is for some reason `HEAP8` (signed), while we want unsigned `HEAPU8`.