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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.import { assert } from "../../testing/asserts.ts";// This module implements functions in https://github.com/nodejs/node/blob/master/src/node_file.cc
/** * Write to the given file from the given buffer asynchronously. * * Implements async part of WriteBuffer in src/node_file.cc * See: https://github.com/nodejs/node/blob/e9ed113/src/node_file.cc#L1818 * * @param fs file descriptor * @param buffer the data to write * @param offset where in the buffer to start from * @param length how much to write * @param position if integer, position to write at in the file. if null, write from the current position * @param callback callback function */export function writeBuffer(  _fd: number,  _buffer: Uint8Array,  _offset: number,  _length: number,  _position: number | null,  _callback?: (err: Error, n: number) => void,): void {  throw new Error("unimplemented!");}
/** * Write to the given file from the given buffer synchronously. * * Implements sync part of WriteBuffer in src/node_file.cc * See: https://github.com/nodejs/node/blob/e9ed113/src/node_file.cc#L1818 * * @param fs file descriptor * @param buffer the data to write * @param offset where in the buffer to start from * @param length how much to write * @param position if integer, position to write at in the file. if null, write from the current position * @param context context object for passing error number */export function writeBufferSync(  fd: number,  buffer: Uint8Array,  offset: number,  length: number,  position: number | null,  ctx: { errno?: number },) {  assert(offset >= 0, "offset should be greater or equal to 0");  assert(    offset + length <= buffer.byteLength,    `buffer doesn't have enough data: byteLength = ${buffer.byteLength}, offset + length = ${offset +      length}`,  );  if (position) {    Deno.seekSync(fd, position, Deno.SeekMode.Current);  }  const subarray = buffer.subarray(offset, offset + length);  try {    return Deno.writeSync(fd, subarray);  } catch (e) {    ctx.errno = extractOsErrorNumberFromErrorMessage(e);    return 0;  }}
function extractOsErrorNumberFromErrorMessage(e: Error): number {  const match = e.message.match(/\(os error (\d+)\)/);  if (match) {    return +match[1];  }  return 255; // Unknown error}