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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright Joyent, Inc. and other Node contributors.//// Permission is hereby granted, free of charge, to any person obtaining a// copy of this software and associated documentation files (the// "Software"), to deal in the Software without restriction, including// without limitation the rights to use, copy, modify, merge, publish,// distribute, sublicense, and/or sell copies of the Software, and to permit// persons to whom the Software is furnished to do so, subject to the// following conditions://// The above copyright notice and this permission notice shall be included// in all copies or substantial portions of the Software.//// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE// USE OR OTHER DEALINGS IN THE SOFTWARE.
// This module ports:// - https://github.com/nodejs/node/blob/master/src/node_file-inl.h// - https://github.com/nodejs/node/blob/master/src/node_file.cc// - https://github.com/nodejs/node/blob/master/src/node_file.h
import { assert } from "../../testing/asserts.ts";
/** * 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 writeBuffer( 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: unknown): number { const match = e instanceof Error ? e.message.match(/\(os error (\d+)\)/) : false;
if (match) { return +match[1]; }
return 255; // Unknown error}