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Back out last changes for now.  They cause problems.

/****************************************************************
Copyright (C) AT&T and Lucent Technologies 1996
All Rights Reserved

Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the names of AT&T or Lucent Technologies
or any of their entities not be used in advertising or publicity
pertaining to distribution of the software without specific,
written prior permission.

AT&T AND LUCENT DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL AT&T OR LUCENT OR ANY OF THEIR
ENTITIES BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
USE OR PERFORMANCE OF THIS SOFTWARE.
****************************************************************/

typedef double	Awkfloat;

/* unsigned char is more trouble than it's worth */

typedef	unsigned char uschar;

#define	xfree(a)	{ if ((a) != NULL) { free((char *) a); a = NULL; } }

#define	DEBUG
#ifdef	DEBUG
			/* uses have to be doubly parenthesized */
#	define	dprintf(x)	if (dbg) printf x
#else
#	define	dprintf(x)
#endif

extern	char	errbuf[200];
#define	ERROR	sprintf(errbuf,
#define	FATAL	), error(1, errbuf)
#define	WARNING	), error(0, errbuf)
#define	SYNTAX	), yyerror(errbuf)

extern int	compile_time;	/* 1 if compiling, 0 if running */

#define	RECSIZE	(3 * 1024)	/* sets limit on records, fields, etc., etc. */
extern int	recsize;	/* variable version */

extern char	**FS;
extern char	**RS;
extern char	**ORS;
extern char	**OFS;
extern char	**OFMT;
extern Awkfloat *NR;
extern Awkfloat *FNR;
extern Awkfloat *NF;
extern char	**FILENAME;
extern char	**SUBSEP;
extern Awkfloat *RSTART;
extern Awkfloat *RLENGTH;

extern char	*record;	/* points to $0 */
extern int	lineno;		/* line number in awk program */
extern int	errorflag;	/* 1 if error has occurred */
extern int	donefld;	/* 1 if record broken into fields */
extern int	donerec;	/* 1 if record is valid (no fld has changed */
extern char	inputFS[];	/* FS at time of input, for field splitting */

extern int	dbg;

typedef struct {
	char	*cbuf;
	int	clen;
	int	cmax;
} Gstring;		/* a string that grows */

extern Gstring	*newGstring(void);		/* constructor */
extern void	delGstring(Gstring *);		/* destructor */
extern char	*cadd(Gstring *gs, int c);	/* function to grow with */
extern void	caddreset(Gstring *gs);		/* set cbuf empty */
extern void	cunadd(Gstring *gs);		/* back up one char in cbuf */

extern Gstring	*gs;	/* used by lex */

extern	char	*patbeg;	/* beginning of pattern matched */
extern	int	patlen;		/* length of pattern matched.  set in b.c */

/* Cell:  all information about a variable or constant */

typedef struct Cell {
	uschar	ctype;		/* OCELL, OBOOL, OJUMP, etc. */
	uschar	csub;		/* CCON, CTEMP, CFLD, etc. */
	char	*nval;		/* name, for variables only */
	char	*sval;		/* string value */
	Awkfloat fval;		/* value as number */
	unsigned tval;		/* type info: STR|NUM|ARR|FCN|FLD|CON|DONTFREE */
	struct Cell *cnext;	/* ptr to next if chained */
} Cell;

typedef struct {		/* symbol table array */
	int	nelem;		/* elements in table right now */
	int	size;		/* size of tab */
	Cell	**tab;		/* hash table pointers */
} Array;

#define	NSYMTAB	50	/* initial size of a symbol table */
extern Array	*symtab;

extern Cell	*recloc;	/* location of input record */
extern Cell	*nrloc;		/* NR */
extern Cell	*fnrloc;	/* FNR */
extern Cell	*nfloc;		/* NF */
extern Cell	*rstartloc;	/* RSTART */
extern Cell	*rlengthloc;	/* RLENGTH */

/* Cell.tval values: */
#define	NUM	01	/* number value is valid */
#define	STR	02	/* string value is valid */
#define DONTFREE 04	/* string space is not freeable */
#define	CON	010	/* this is a constant */
#define	ARR	020	/* this is an array */
#define	FCN	040	/* this is a function name */
#define FLD	0100	/* this is a field $1, $2, ... */
#define	REC	0200	/* this is $0 */


/* function types */
#define	FLENGTH	1
#define	FSQRT	2
#define	FEXP	3
#define	FLOG	4
#define	FINT	5
#define	FSYSTEM	6
#define	FRAND	7
#define	FSRAND	8
#define	FSIN	9
#define	FCOS	10
#define	FATAN	11
#define	FTOUPPER 12
#define	FTOLOWER 13
#define	FFLUSH	14

/* Node:  parse tree is made of nodes, with Cell's at bottom */

typedef struct Node {
	int	ntype;
	struct	Node *nnext;
	int	lineno;
	int	nobj;
	struct Node *narg[1];	/* variable: actual size set by calling malloc */
} Node;

#define	NIL	((Node *) 0)

extern Node	*winner;
extern Node	*nullstat;
extern Node	*nullnode;

/* ctypes */
#define OCELL	1
#define OBOOL	2
#define OJUMP	3

/* Cell subtypes: csub */
#define	CFREE	7
#define CCOPY	6
#define CCON	5
#define CTEMP	4
#define CNAME	3 
#define CVAR	2
#define CFLD	1
#define	CUNK	0

/* bool subtypes */
#define BTRUE	11
#define BFALSE	12

/* jump subtypes */
#define JEXIT	21
#define JNEXT	22
#define	JBREAK	23
#define	JCONT	24
#define	JRET	25
#define	JNEXTFILE	26

/* node types */
#define NVALUE	1
#define NSTAT	2
#define NEXPR	3
#define	NFIELD	4


extern	int	pairstack[], paircnt;

#define notlegal(n)	(n <= FIRSTTOKEN || n >= LASTTOKEN || proctab[n-FIRSTTOKEN] == nullproc)
#define isvalue(n)	((n)->ntype == NVALUE)
#define isexpr(n)	((n)->ntype == NEXPR)
#define isjump(n)	((n)->ctype == OJUMP)
#define isexit(n)	((n)->csub == JEXIT)
#define	isbreak(n)	((n)->csub == JBREAK)
#define	iscont(n)	((n)->csub == JCONT)
#define	isnext(n)	((n)->csub == JNEXT)
#define	isnextfile(n)	((n)->csub == JNEXTFILE)
#define	isret(n)	((n)->csub == JRET)
#define isstr(n)	((n)->tval & STR)
#define isnum(n)	((n)->tval & NUM)
#define isarr(n)	((n)->tval & ARR)
#define isfunc(n)	((n)->tval & FCN)
#define istrue(n)	((n)->csub == BTRUE)
#define istemp(n)	((n)->csub == CTEMP)
#define	isargument(n)	((n)->nobj == ARG)
#define freeable(p)	(!((p)->tval & DONTFREE))

/* structures used by regular expression matching machinery, mostly b.c: */

#define NCHARS	(256+1)		/* 256 handles 8-bit chars; 128 does 7-bit */
				/* watch out in match(), etc. */
#define NSTATES	32

typedef struct rrow {
	int	ltype;
	union {
		int i;
		Node *np;
		char *up;
	} lval;		/* because Al stores a pointer in it! */
	int	*lfollow;
} rrow;

typedef struct fa {
	char	*restr;
	int	anchor;
	int	use;
	uschar	gototab[NSTATES][NCHARS];
	int	*posns[NSTATES];
	uschar	out[NSTATES];
	int	initstat;
	int	curstat;
	int	accept;
	int	reset;
	struct	rrow re[1];
} fa;


#include "proto.h"