xref: /plan9/sys/src/cmd/awk/awk.h (revision 7dd7cddf99dd7472612f1413b4da293630e6b1bc)

/*
Copyright (c) Lucent Technologies 1997
	All Rights Reserved

*/

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[];

extern int	compile_time;	/* 1 if compiling, 0 if running */
extern int	safe;		/* 0 => unsafe, 1 => safe */

#define	RECSIZE	(8 * 1024)	/* sets limit on records, fields, etc., etc. */
extern int	recsize;	/* size of current record, orig RECSIZE */

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;

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 */
	int	 tval;		/* type info: STR|NUM|ARR|FCN|FLD|CON|DONTFREE */
	struct Cell *cnext;	/* ptr to next if chained */
} Cell;

typedef struct Array {		/* 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	*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
#define	FUTF	15

/* 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


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 isrec(n)	((n)->tval & REC)
#define isfld(n)	((n)->tval & FLD)
#define isstr(n)	((n)->tval & STR)
#define isnum(n)	((n)->tval & NUM)
#define isarr(n)	((n)->tval & ARR)
#define isfcn(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)) */
#define freeable(p)	( ((p)->tval & (STR|DONTFREE)) == STR )

#include "proto.h"