[PATCH] CMD: Always keep drive letter uppercase.

[Gareth Poole]

Windows and DOS before it has always kept the drive letter in uppercase at the command line, regardless of what input it is given. Since paths are case-insensitive this should not affect path resolution, but it is more consistent with bothe behaviour of Windows, and the behaviour that Wine CMD already displays with directory names.

Signed-off-by: Gareth Poole <girpoole at gmail.com>
---
 programs/cmd/wcmdmain.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/programs/cmd/wcmdmain.c b/programs/cmd/wcmdmain.c
index 97cc607a64..5f5f65fe34 100644
--- a/programs/cmd/wcmdmain.c
+++ b/programs/cmd/wcmdmain.c
@@ -392,12 +392,20 @@ static void WCMD_show_prompt (BOOL newLine) {
 	  break;
 	case 'N':
           status = GetCurrentDirectoryW(ARRAY_SIZE(curdir), curdir);
+	  /* No need to worry about surrogates here, because all possible */
+	  /* drive letters are in the BMP. */
+	  if (IsCharAlphaW(curdir[0])) { /* Check if the path begins with a drive letter. */
+	    curdir[0] = toupper(curdir[0]); /* Ensure that the drive letter is shown in uppercase. */
+	  }
 	  if (status) {
 	    *q++ = curdir[0];
 	  }
 	  break;
 	case 'P':
           status = GetCurrentDirectoryW(ARRAY_SIZE(curdir), curdir);
+	  if (IsCharAlphaW(curdir[0])) {
+	    curdir[0] = toupper(curdir[0]);
+	  }
 	  if (status) {
 	    lstrcatW (q, curdir);
 	    while (*q) q++;
@@ -1383,7 +1391,9 @@ void WCMD_execute (const WCHAR *command, const WCHAR *redirects,
         (!cmd[2] || cmd[2] == ' ' || cmd[2] == '\t')) {
       WCHAR envvar[5];
       WCHAR dir[MAX_PATH];
-
+      /* Make sure that the working directory is set to the */
+      /* canonical uppercase version of the drive letter. */
+      cmd[0] = toupper(cmd[0]);
       /* Ignore potential garbage on the same line */
       cmd[2]=0x00;
 
-- 
2.27.0