From 9c71b5901c700bb2b18b0083130e65e97e386089 Mon Sep 17 00:00:00 2001
From: YO4 <ysno@ac.auone-net.jp>
Date: Wed, 22 Jan 2025 18:30:08 +0900
Subject: [PATCH] fix rb_w32_strerror when errno < 0

change SystemCallError.new(-1) message on Windows

(Bug #21083)
https://bugs.ruby-lang.org/issues/21083
---
 win32/win32.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/win32/win32.c b/win32/win32.c
index 784c150393..a2daba2fa1 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -2805,11 +2805,11 @@ rb_w32_strerror(int e)
     DWORD source = 0;
     char *p;
 
-    if (e < 0 || e > sys_nerr) {
-        if (e < 0)
-            e = GetLastError();
+    if (e < 0)
+        strlcpy(buffer, "Unknown Error", sizeof(buffer));
+    else if (e > sys_nerr) {
 #if WSAEWOULDBLOCK != EWOULDBLOCK
-        else if (e >= EADDRINUSE && e <= EWOULDBLOCK) {
+        if (e >= EADDRINUSE && e <= EWOULDBLOCK) {
             static int s = -1;
             int i;
             if (s < 0)