Liam Middlebrook : cmd: Fix empty strings between PATH separators.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0911d462f977aef1071b59b70cfa68398f13663b
URL:    https://gitlab.winehq.org/wine/wine/-/commit/0911d462f977aef1071b59b70cfa683...

Author: Liam Middlebrook <lmiddlebrook(a)nvidia.com>
Date:   Tue Jun 20 10:33:56 2023 -0700

cmd: Fix empty strings between PATH separators.

Previously if an empty string was encountered while parsing out PATH,
cmd.exe would ignore the rest of the PATH entirely.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55097
Signed-off-by: Liam Middlebrook <lmiddlebrook(a)nvidia.com>

---

 programs/cmd/wcmdmain.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/programs/cmd/wcmdmain.c b/programs/cmd/wcmdmain.c
index 022ff6637c5..de6e721b26a 100644
--- a/programs/cmd/wcmdmain.c
+++ b/programs/cmd/wcmdmain.c
@@ -1135,6 +1135,12 @@ void WCMD_run_program (WCHAR *command, BOOL called)
         else
             lstrcpyW(temp, thisDir + 1);
 
+        /* When temp is an empty string, skip over it. This needs
+           to be done before the expansion, because WCMD_get_fullpath
+           fails when given an empty string                         */
+        if (*temp == '\0')
+            continue;
+
         /* Since you can have eg. ..\.. on the path, need to expand
            to full information                                      */
         if (!WCMD_get_fullpath(temp, ARRAY_SIZE(thisDir), thisDir, NULL)) return;