win32: more improvements to 'c:file' paths

Tab-completion of 'c:file' paths was leaking memory and incorrectly
included BusyBox applets and shell built-ins.

Fix handling of 'c:file' paths used as arguments to spawn functions.
Otherwise things like 'timeout 5 c:busybox sleep 99' don't work.

1 files changed, 3 insertions, 2 deletions

diff --git a/win32/process.c b/win32/process.c
index 8546c6e2f..4257fd689 100644
--- a/win32/process.c
+++ b/win32/process.c
@@ -320,8 +320,9 @@ mingw_spawn_1(int mode, const char *cmd, char *const *argv, char *const *envp)
                 return mingw_spawn_applet(mode, argv, envp);
         else
 #endif
-        if (strchr(cmd, '/') || strchr(cmd, '\\')) {
-                return mingw_spawn_interpreter(mode, cmd, argv, envp);
+        if (strchr(cmd, '/') || strchr(cmd, '\\') || has_dos_drive_prefix(cmd)) {
+                const char *path = auto_win32_extension(cmd);
+                return mingw_spawn_interpreter(mode, path ? path : cmd, argv, envp);
         }
         else if ((prog=find_first_executable(cmd)) != NULL) {
                 intptr_t ret = mingw_spawn_interpreter(mode, prog, argv, envp);