60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* Copyright (c) 1985 Ceriel J.H. Jacobs */
|
|
|
|
/* $Header$ */
|
|
|
|
# ifndef _MACHINE_
|
|
# define PUBLIC extern
|
|
# else
|
|
# define PUBLIC
|
|
# endif
|
|
|
|
/*
|
|
* Simple minded finite state machine implementation to recognize
|
|
* strings.
|
|
*/
|
|
|
|
struct state {
|
|
char s_char; /* character to match with */
|
|
char s_endstate; /* flag, 1 if this state is an endstate */
|
|
struct state *s_match; /* new state if matched */
|
|
struct state *s_next; /* other characters to match with */
|
|
short s_cnt; /* if an endstate, this field is filled with
|
|
* some info, dependant on the machine.
|
|
*/
|
|
};
|
|
|
|
# define FSM_OKE 0
|
|
# define FSM_ISPREFIX -1 /* Must be < 0 */
|
|
# define FSM_HASPREFIX 1
|
|
|
|
int addstring();
|
|
/*
|
|
* int addstring(str,cnt,mach)
|
|
* char *str; The string to be recognized
|
|
* int cnt; Attribute of the string.
|
|
* struct state **mach; The finite state machine
|
|
*
|
|
* This routine adds a string to a finite state automaton.
|
|
* It returns FSM_ISPREFIX if the added string is a prefix of a string already
|
|
* in the automaton, FSM_HASPREFIX if a string, already recognized by the
|
|
* automaton, is a prefix of the added string.
|
|
* Otherwise it returns FSM_OKE.
|
|
*/
|
|
|
|
int match();
|
|
/*
|
|
* int match(str,p_int,mach)
|
|
* char *str; pointer to string
|
|
* int *p_int; Pointer to an integer
|
|
* struct state *mach; The finite state machine
|
|
*
|
|
* A match of the string indicated by "str" is tried. If a head of "str"
|
|
* is recognized by the finite state automaton, a machine dependant number
|
|
* is put in the integer pointed to by "p_int".
|
|
* The number of characters that match is returned, so a return value of 0
|
|
* means no match.
|
|
* A return value of FSM_PREFIX means that the string "str" was a prefix of a
|
|
* matched string.
|
|
*/
|
|
|
|
# undef PUBLIC
|