#define	INS	327680		/* input buffer */#define	OBS	40960		/* outbut buffer */#define	NARG	640		/* Max number arguments to a macro */#define	NINCLUDE 64		/* Max number of include directories (-I) */#define	NIF	32		/* depth of nesting of #if */#ifndef EOF#define	EOF	(-1)#endif#ifndef NULL#define NULL	0#endif enum toktype { END, UNCLASS, NAME, NUMBER, STRING, CCON, NL, WS, DSHARP,		EQ, NEQ, LEQ, GEQ, LSH, RSH, LAND, LOR, PPLUS, MMINUS,		ARROW, SBRA, SKET, LP, RP, DOT, AND, STAR, PLUS, MINUS,		TILDE, NOT, SLASH, PCT, LT, GT, CIRC, OR, QUEST,		COLON, ASGN, COMMA, SHARP, SEMIC, CBRA, CKET,		ASPLUS, ASMINUS, ASSTAR, ASSLASH, ASPCT, ASCIRC, ASLSH,		ASRSH, ASOR, ASAND, ELLIPS,		DSHARP1, NAME1, DEFINED, UMINUS }; enum kwtype { KIF, KIFDEF, KIFNDEF, KELIF, KELSE, KENDIF, KINCLUDE, KDEFINE,		KUNDEF, KLINE, KERROR, KWARNING, KPRAGMA, KDEFINED,		KLINENO, KFILE, KDATE, KTIME, KSTDC, KEVAL }; #define	ISDEFINED	01	/* has #defined value */#define	ISKW		02	/* is PP keyword */#define	ISUNCHANGE	04	/* can't be #defined in PP */#define	ISMAC		010	/* builtin macro, e.g. __LINE__ */#define	ISVARMAC	020	/* variadic macro */ #define	EOB	0xFE		/* sentinel for end of input buffer */#define	EOFC	0xFD		/* sentinel for end of input file */#define	XPWS	1		/* token flag: white space to assure token sep. */ enum { Notinmacro, Inmacro }; typedef struct token {	unsigned char	type;	unsigned char 	flag;	unsigned short	hideset;	unsigned int	wslen;	unsigned int	len;	uchar	*t;} Token; typedef struct tokenrow {	Token	*tp;		/* current one to scan */	Token	*bp;		/* base (allocated value) */	Token	*lp;		/* last+1 token used */	int	max;		/* number allocated */} Tokenrow; typedef struct source {	char	*filename;	/* name of file of the source */	int	line;		/* current line number */	int	lineinc;	/* adjustment for \\n lines */	uchar	*inb;		/* input buffer */	uchar	*inp;		/* input pointer */	uchar	*inl;		/* end of input */	int 	ins;		/* input buffer size */	int	fd;		/* input source */	int	ifdepth;	/* conditional nesting in include */	struct	source *next;	/* stack for #include */} Source; typedef struct nlist {	struct nlist *next;	uchar	*name;	int	len;	Tokenrow *vp;		/* value as macro */	Tokenrow *ap;		/* list of argument names, if any */	char	val;		/* value as preprocessor name */	char	flag;		/* is defined, is pp name */} Nlist; typedef	struct	includelist {	char	deleted;	char	always;	char	*file;} Includelist; #define	new(t)	(t *)domalloc(sizeof(t))#define	quicklook(a,b)	(namebit[(a)&077] & (1<<((b)&037)))#define	quickset(a,b)	namebit[(a)&077] |= (1<<((b)&037))extern	unsigned long namebit[077+1]; enum errtype { WARNING, ERROR, FATAL }; void	expandlex(void);void	fixlex(void);void	setup(int, char **);#define gettokens cpp_gettokensint	gettokens(Tokenrow *, int);int	comparetokens(Tokenrow *, Tokenrow *);Source	*setsource(char *, int, char *);void	unsetsource(void);void	puttokens(Tokenrow *);void	process(Tokenrow *);void	*dorealloc(void *, int);void	*domalloc(int);void	dofree(void *);void	error(enum errtype, char *, ...);void	flushout(void);int	fillbuf(Source *);int	trigraph(Source *);int	foldline(Source *);Nlist	*lookup(Token *, int);void	control(Tokenrow *);void	dodefine(Tokenrow *);void	doadefine(Tokenrow *, int);void	doinclude(Tokenrow *);void	doif(Tokenrow *, enum kwtype);void	expand(Tokenrow *, Nlist *, int);void	builtin(Tokenrow *, int);int	gatherargs(Tokenrow *, Tokenrow **, int, int *);void	substargs(Nlist *, Tokenrow *, Tokenrow **);void	expandrow(Tokenrow *, char *, int);void	maketokenrow(int, Tokenrow *);Tokenrow *copytokenrow(Tokenrow *, Tokenrow *);Token	*growtokenrow(Tokenrow *);Tokenrow *normtokenrow(Tokenrow *);void	adjustrow(Tokenrow *, int);void	movetokenrow(Tokenrow *, Tokenrow *);void	insertrow(Tokenrow *, int, Tokenrow *);void	peektokens(Tokenrow *, char *);void	doconcat(Tokenrow *);Tokenrow *stringify(Tokenrow *);int	lookuparg(Nlist *, Token *);long	eval(Tokenrow *, int);void	genline(void);void	setempty(Tokenrow *);void	makespace(Tokenrow *);char	*outnum(char *, int);int	digit(int);uchar	*newstring(uchar *, int, int);int	checkhideset(int, Nlist *);void	prhideset(int);int	newhideset(int, Nlist *);int	unionhideset(int, int);void	iniths(void);void	setobjname(char *);void	clearwstab(void);#define	rowlen(tokrow)	((tokrow)->lp - (tokrow)->bp) extern	char *outp;extern	Token	nltoken;extern	Source *cursource;extern	char *curtime;extern	int incdepth;extern	int ifdepth;extern	int ifsatisfied[NIF];extern	int Mflag;extern	int nolineinfo;extern	int skipping;extern	int verbose;extern	int Cplusplus;extern	Nlist *kwdefined;extern	Includelist includelist[NINCLUDE];extern	char wd[];