readline中这段代码什么意思?
61 extern char *xmalloc ();
62
63 /* The names of functions that actually do the manipulation. */
64 int com_list PARAMS((char *));
65 int com_view PARAMS((char *));
66 int com_rename PARAMS((char *));
67 int com_stat PARAMS((char *));
68 int com_pwd PARAMS((char *));
69 int com_delete PARAMS((char *));
70 int com_help PARAMS((char *));
71 int com_cd PARAMS((char *));
72 int com_quit PARAMS((char *));
这段代码谁能解释给我看看~!!多谢!!~~