Don't modify the process's command name passed to start-process on MS-Windows.

 src/w32proc.c (sys_spawnve): Avoid modification of the CMDNAME
 argument passed by the caller, when we mirror all slashes into
 backslashes.

2 files changed, 15 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index de462841e0d..1effdb3a3b2 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2014-10-01  Eli Zaretskii  <eliz@gnu.org>
+
+	* w32proc.c (sys_spawnve): Avoid modification of the CMDNAME
+	argument passed by the caller, when we mirror all slashes into
+	backslashes.
+
 2014-10-01  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	* gtkutil.c (xg_set_toolkit_horizontal_scroll_bar_thumb):
diff --git a/src/w32proc.c b/src/w32proc.c
index b255c57cd7c..38452917add 100644
--- a/src/w32proc.c
+++ b/src/w32proc.c
@@ -1605,6 +1605,15 @@ sys_spawnve (int mode, char *cmdname, char **argv, char **envp)
       program = ENCODE_FILE (full);
       cmdname = SDATA (program);
     }
+  else
+    {
+      char *p = alloca (strlen (cmdname) + 1);
+
+      /* Don't change the command name we were passed by our caller
+	 (unixtodos_filename below will destructively mirror forward
+	 slashes).  */
+      cmdname = strcpy (p, cmdname);
+    }
 
   /* make sure argv[0] and cmdname are both in DOS format */
   unixtodos_filename (cmdname);