/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- if (shell != NULL &&
- strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
+ if (shell != NULL && (len = strlen(shell)) > 2 &&
+ strncmp(shell + len - 3, "csh", 3) == 0)