1 files changed, 81 insertions, 0 deletions
diff --git a/ext/node/polyfills/_fs/_fs_writev.mjs b/ext/node/polyfills/_fs/_fs_writev.mjs
new file mode 100644
index 000000000..ffc67c81a
--- /dev/null
+++ b/ext/node/polyfills/_fs/_fs_writev.mjs
@@ -0,0 +1,81 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.
+import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
+import { validateBufferArray } from "internal:deno_node/polyfills/internal/fs/utils.mjs";
+import { getValidatedFd } from "internal:deno_node/polyfills/internal/fs/utils.mjs";
+import { maybeCallback } from "internal:deno_node/polyfills/_fs/_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);
+}