From 9caf6157a59082804c240d209cf85a6a40f777a3 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Tue, 2 Jan 2024 14:47:30 -0800
Subject: isdrive: fix misuse of isalpha.

* winsup/cygwin/path.h (isdrive): This macro is called with a char
argument, which it passes to isalpha. It needs to be cast to
unsigned char.
---
 winsup/cygwin/path.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/path.h b/winsup/cygwin/path.h
index c1cdc554b..f3dffe719 100644
--- a/winsup/cygwin/path.h
+++ b/winsup/cygwin/path.h
@@ -438,7 +438,7 @@ const char *__reg3 find_exec (const char *name, path_conv& buf,
 				 const char **known_suffix = NULL);
 
 /* Common macros for checking for invalid path names */
-#define isdrive(s) (isalpha (*(s)) && (s)[1] == ':')
+#define isdrive(s) (isalpha ((unsigned char) *(s)) && (s)[1] == ':')
 #define iswdrive(s) (iswalpha (*(s)) && (s)[1] == L':')
 
 static inline bool
-- 
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