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