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#define Atom 256 /* token Atom (an impossible char value) */
#define Epsilon 257 /* epsilon arc (an impossible char value) */
/* track field must be same for all node types */
typedef struct _a {
struct _a *track; /* track mem allocation */
int label;
struct _a *next;
struct _n *target;
} Arc, *ArcPtr;
typedef struct _n {
struct _n *track;
ArcPtr arcs, arctail;
} Node, *NodePtr;
typedef struct {
NodePtr left,
right;
} Graph, *GraphPtr;
#ifdef __USE_PROTOS
int rexpr( char *expr, char *s );
int match( NodePtr automaton, char *s );
#else
int rexpr();
int match();
#endif
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