+ int len;
+ struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
+ char *path = xstrdup(argv[2]);
+
+ /*
+ * We have to normalize the arguments because under
+ * Windows, bash mangles arguments that look like
+ * absolute POSIX paths or colon-separate lists of
+ * absolute POSIX paths into DOS paths (e.g.,
+ * "/foo:/foo/bar" might be converted to
+ * "D:\Src\msysgit\foo;D:\Src\msysgit\foo\bar"),
+ * whereas longest_ancestor_length() requires paths
+ * that use forward slashes.
+ */
+ if (normalize_path_copy(path, path))
+ die("Path \"%s\" could not be normalized", argv[2]);
+ string_list_split(&ceiling_dirs, argv[3], PATH_SEP, -1);
+ filter_string_list(&ceiling_dirs, 0,
+ normalize_ceiling_entry, NULL);
+ len = longest_ancestor_length(path, &ceiling_dirs);
+ string_list_clear(&ceiling_dirs, 0);
+ free(path);