ash: strip trailing slash from directory if necessary

The previous commit removed trailing dots and spaces from the last
component of a pathname when changing directory.  If the result has
a trailing slash remove that too.  But not if it's a drive root,
to avoid 'cd C:/' showing a current directory of 'C:'.

Adds 48 bytes.

(GitHub issue #478)

1 files changed, 5 insertions, 0 deletions

diff --git a/win32/mingw.c b/win32/mingw.c
index 6842dba48..7a5198ccf 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -2189,6 +2189,11 @@ void FAST_FUNC strip_dot_space(char *p)
         while (end > start && (end[-1] == '.' || end[-1] == ' ')) {
                 *--end = '\0';
         }
+
+        // Strip trailing slash, but not from a drive root (C:/)
+        if (--end != start && (*end == '/' || *end == '\\') &&
+                        !(end == p + 2 && root_len(p) == 2))
+                *end = '\0';
 }
 
 size_t FAST_FUNC remove_cr(char *p, size_t len)