From 4d4908dde31316462acae5caec8dfcbbf7a244bd Mon Sep 17 00:00:00 2001
From: Alexandre Szymocha <alexandre@szymocha.com>
Date: Sat, 28 Dec 2019 14:48:36 +0100
Subject: Fix: allow reading into a 0-length array (#3329)

---
 cli/js/files.ts | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'cli/js/files.ts')

diff --git a/cli/js/files.ts b/cli/js/files.ts
index 66a70f981..d3a4b5809 100644
--- a/cli/js/files.ts
+++ b/cli/js/files.ts
@@ -50,6 +50,9 @@ export async function open(
  *
  */
 export function readSync(rid: number, p: Uint8Array): number | EOF {
+  if (p.length == 0) {
+    return 0;
+  }
   const nread = sendSyncMinimal(dispatch.OP_READ, rid, p);
   if (nread < 0) {
     throw new Error("read error");
@@ -70,6 +73,9 @@ export function readSync(rid: number, p: Uint8Array): number | EOF {
  *       const text = new TextDecoder().decode(buf);
  */
 export async function read(rid: number, p: Uint8Array): Promise<number | EOF> {
+  if (p.length == 0) {
+    return 0;
+  }
   const nread = await sendAsyncMinimal(dispatch.OP_READ, rid, p);
   if (nread < 0) {
     throw new Error("read error");
-- 
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