From 83b8ec2c60e868dff3e3d92b50187611ab06d9d8 Mon Sep 17 00:00:00 2001
From: Haris Skiadas <cskiadas@gmail.com>
Date: Sat, 26 Jul 2025 14:04:02 -0400
Subject: [PATCH] On input(..) use inputfun only if sys.stdin has not been
 overwritten.

---
 src/builtin.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/builtin.js b/src/builtin.js
index 321d0f192..e8f262a6a 100644
--- a/src/builtin.js
+++ b/src/builtin.js
@@ -701,7 +701,8 @@ Sk.builtin.raw_input = function (prompt) {
     var lprompt = prompt ? prompt : "";
 
     return Sk.misceval.chain(Sk.importModule("sys", false, true), function (sys) {
-        if (Sk.inputfunTakesPrompt) {
+        const isTrueStdin = sys["$d"]["stdin"]["fileno"] == 0;
+        if (Sk.inputfunTakesPrompt && isTrueStdin) {
             return Sk.builtin.file.$readline(sys["$d"]["stdin"], null, lprompt);
         } else {
             return Sk.misceval.chain(
@@ -791,7 +792,7 @@ Sk.builtin.exec = function (code, globals, locals) {
     );
     /**@todo shouldn't have to do this - Sk.globals loses scope*/
     const tmp = Sk.globals;
-    /** 
+    /**
      * @todo this is not correct outside of __main__ i.e. exec doesn't work inside modules using the module scope
      * This is because globals don't work outside of __main__
     */