From 43889f157171fed338f098df8bd276d2716f97de Mon Sep 17 00:00:00 2001
From: "E. C. Masloch" <pushbx@ulukai.org>
Date: Mon, 29 Apr 2024 13:59:24 +0200
Subject: [PATCH] COPY: allow lowercase drive letter for destination

Bug apparently in 6f764c2065fa6ffc3cbeba18043d9a4d0e22a00c
---
 cmd/copy.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/cmd/copy.c b/cmd/copy.c
index 8f9f1a24..c22adffa 100644
--- a/cmd/copy.c
+++ b/cmd/copy.c
@@ -26,6 +26,7 @@
 #include "../config.h"
 
 #include <assert.h>
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -658,8 +659,8 @@ int cmd_copy(char *rest)
 
 #define dst destFile
   /* If the destination specifies a drive, check that it is valid */
-  if (dst[0] && dst[1] == ':' && !is_valid_disk(dst[0] - 'A')) {
-    error_invalid_drive(dst[0] - 'A');
+  if (dst[0] && dst[1] == ':' && !is_valid_disk(toupper(dst[0]) - 'A')) {
+    error_invalid_drive(toupper(dst[0]) - 'A');
     return 0;
   }
 #undef dst