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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.import { Buffer } from "../buffer.ts";import { validateBufferArray } from "../internal/fs/utils.mjs";import { getValidatedFd } from "../internal/fs/utils.mjs";import { maybeCallback } from "./_fs_common.ts";
export function writev(fd, buffers, position, callback) {  const innerWritev = async (fd, buffers, position) => {    const chunks = [];    const offset = 0;    for (let i = 0; i < buffers.length; i++) {      if (Buffer.isBuffer(buffers[i])) {        chunks.push(buffers[i]);      } else {        chunks.push(Buffer.from(buffers[i]));      }    }    if (typeof position === "number") {      await Deno.seekSync(fd, position, Deno.SeekMode.Start);    }    const buffer = Buffer.concat(chunks);    let currentOffset = 0;    while (currentOffset < buffer.byteLength) {      currentOffset += await Deno.writeSync(fd, buffer.subarray(currentOffset));    }    return currentOffset - offset;  };
  fd = getValidatedFd(fd);  validateBufferArray(buffers);  callback = maybeCallback(callback || position);
  if (buffers.length === 0) {    process.nextTick(callback, null, 0, buffers);    return;  }
  if (typeof position !== "number") position = null;
  innerWritev(fd, buffers, position).then(    (nwritten) => {      callback(null, nwritten, buffers);    },    (err) => callback(err),  );}
export function writevSync(fd, buffers, position) {  const innerWritev = (fd, buffers, position) => {    const chunks = [];    const offset = 0;    for (let i = 0; i < buffers.length; i++) {      if (Buffer.isBuffer(buffers[i])) {        chunks.push(buffers[i]);      } else {        chunks.push(Buffer.from(buffers[i]));      }    }    if (typeof position === "number") {      Deno.seekSync(fd, position, Deno.SeekMode.Start);    }    const buffer = Buffer.concat(chunks);    let currentOffset = 0;    while (currentOffset < buffer.byteLength) {      currentOffset += Deno.writeSync(fd, buffer.subarray(currentOffset));    }    return currentOffset - offset;  };
  fd = getValidatedFd(fd);  validateBufferArray(buffers);
  if (buffers.length === 0) {    return 0;  }
  if (typeof position !== "number") position = null;
  return innerWritev(fd, buffers, position);}