1 typedef struct Addr Addr; 2 typedef struct Cmd Cmd; 3 struct Addr 4 { 5 char type; /* # (char addr), l (line addr), / ? . $ + - , ; */ 6 union{ 7 String *re; 8 Addr *aleft; /* left side of , and ; */ 9 } g; 10 Posn num; 11 Addr *next; /* or right side of , and ; */ 12 }; 13 14 #define are g.re 15 #define left g.aleft 16 17 struct Cmd 18 { 19 Addr *addr; /* address (range of text) */ 20 String *re; /* regular expression for e.g. 'x' */ 21 union{ 22 Cmd *cmd; /* target of x, g, {, etc. */ 23 String *text; /* text of a, c, i; rhs of s */ 24 Addr *addr; /* address for m, t */ 25 } g; 26 Cmd *next; /* pointer to next element in {} */ 27 short num; 28 ushort flag; /* whatever */ 29 ushort cmdc; /* command character; 'x' etc. */ 30 }; 31 32 #define ccmd g.cmd 33 #define ctext g.text 34 #define caddr g.addr 35 36 extern struct cmdtab{ 37 ushort cmdc; /* command character */ 38 uchar text; /* takes a textual argument? */ 39 uchar regexp; /* takes a regular expression? */ 40 uchar addr; /* takes an address (m or t)? */ 41 uchar defcmd; /* default command; 0==>none */ 42 uchar defaddr; /* default address */ 43 uchar count; /* takes a count e.g. s2/// */ 44 char *token; /* takes text terminated by one of these */ 45 int (*fn)(File*, Cmd*); /* function to call with parse tree */ 46 }cmdtab[]; 47 48 enum Defaddr{ /* default addresses */ 49 aNo, 50 aDot, 51 aAll 52 }; 53 54 int nl_cmd(File*, Cmd*), a_cmd(File*, Cmd*), b_cmd(File*, Cmd*); 55 int c_cmd(File*, Cmd*), cd_cmd(File*, Cmd*), d_cmd(File*, Cmd*); 56 int D_cmd(File*, Cmd*), e_cmd(File*, Cmd*); 57 int f_cmd(File*, Cmd*), g_cmd(File*, Cmd*), i_cmd(File*, Cmd*); 58 int k_cmd(File*, Cmd*), m_cmd(File*, Cmd*), n_cmd(File*, Cmd*); 59 int p_cmd(File*, Cmd*), q_cmd(File*, Cmd*); 60 int s_cmd(File*, Cmd*), u_cmd(File*, Cmd*), w_cmd(File*, Cmd*); 61 int x_cmd(File*, Cmd*), X_cmd(File*, Cmd*), plan9_cmd(File*, Cmd*); 62 int eq_cmd(File*, Cmd*); 63 64 65 String *getregexp(int); 66 Addr *newaddr(void); 67 Address address(Addr*, Address, int); 68 int cmdexec(File*, Cmd*); 69