/*
 * Bawk constants and variable declarations.
 */
#ifdef BDS_C
#define EXTERN /* */
#else

#ifdef MAIN
#define EXTERN /* */
#else
#define EXTERN extern
#endif

#endif


#define DEBUG 1	/* remove this line to compile without debug statements */
#ifdef DEBUG
EXTERN char Debug;		/* debug print flag */
#endif

/*
 * Table and buffer sizes
 */
#define MAXLINELEN	128	/* longest input line */
#define MAXWORDS	(MAXLINELEN/2)	/* max # of words in a line */
#define MAXWORKBUFLEN	4096	/* longest action or regular expression */
#define MAXVARTABSZ	50	/* max # of symbols */
#define MAXVARLEN	10	/* symbol name length */
#define MAXSTACKSZ	40	/* max value stack length (for expressions) */


/**********************************************************
 * Current Input File variables                           *
 **********************************************************/
/*
 * Current Input File pointer:
 */
#ifdef BDS_C
EXTERN char *Fileptr, Curfbuf[ BUFSIZ ];
#else
EXTERN FILE *Fileptr;
#endif
EXTERN char *Filename;		/* current input file name */
EXTERN int Linecount;		/* current input line number */
EXTERN int Recordcount;		/* record count */
/*
 * Working buffers.
 */
EXTERN char Linebuf[ MAXLINELEN ];	/* current input line buffer */
EXTERN char *Fields[ MAXWORDS ];		/* pointers to the words in Linebuf */
EXTERN int Fieldcount;			/* and the # of words */
EXTERN char Workbuf[ MAXWORKBUFLEN ];	/* work area for C action and */
					/* regular expression parsers */

/**********************************************************
 * Regular Expression Parser variables                    *
 **********************************************************/
/*
 * Tokens:
 */
#define CHAR	1
#define BOL	2
#define EOL	3
#define ANY	4
#define CLASS	5
#define NCLASS	6
#define STAR	7
#define PLUS	8
#define MINUS	9
#define ALPHA	10
#define DIGIT	11
#define NALPHA	12
#define PUNCT	13
#define RANGE	14
#define ENDPAT	15


/**********************************************************
 * C Actions Interpreter variables                        *
 **********************************************************/
/*
 * Tokens:
 */
#define T_STRING	'S'	/* primaries: */
#define T_DOLLAR	'$'
#define T_REGEXP	'r'
#define T_CONSTANT	'C'
#define T_VARIABLE	'V'
#define T_FUNCTION	'F'
#define T_SEMICOLON	';'	/* punctuation */
#define T_EOF		'Z'
#define T_LBRACE	'{'
#define T_RBRACE	'}'
#define T_LPAREN	'('
#define T_RPAREN	')'
#define T_LBRACKET	'['
#define T_RBRACKET	']'
#define T_COMMA		','
#define T_ASSIGN	'='	/* operators: */
#define T_MUL		'*'
#define T_DIV		'/'
#define T_MOD		'%'
#define T_ADD		'+'
#define T_SUB		'-'
#define T_SHL		'L'
#define T_SHR		'R'
#define T_LT		'<'
#define T_LE		'l'
#define T_GT		'>'
#define T_GE		'g'
#define T_EQ		'q'
#define T_NE		'n'
#define T_NOT		'~'
#define T_AND		'&'
#define T_XOR		'^'
#define T_IOR		'|'
#define T_LNOT		'!'
#define T_LAND		'a'
#define T_LIOR		'o'
#define T_INCR		'p'
#define T_DECR		'm'
#define T_IF		'i'	/* keywords: */
#define T_ELSE		'e'
#define T_WHILE		'w'
#define T_BREAK		'b'
#define T_CHAR		'c'
#define T_INT		't'
#define T_BEGIN		'B'
#define T_END		'E'
#define T_NF		'f'
#define T_NR		'#'
#define T_FS		' '
#define T_RS		'\n'
#define T_FILENAME	'z'

#define PATTERN	'P'	/* indicates C statement is within a pattern */
#define ACTION	'A'	/* indicates C statement is within an action */

/*
 * Symbol Table values
 */
#define ACTUAL		0
#define LVALUE		1
#define BYTE		1
#define WORD		2
/*
 * Symbol table
 */
struct variable {
	char	vname[ MAXVARLEN ];
	char	vclass;
	char	vsize;
	int	vlen;
	char	*vptr;
};
#define VARIABLE struct variable
EXTERN VARIABLE Vartab[ MAXVARTABSZ ], *Nextvar;
/*
 * Value stack
 */
union datum {
	int	ival;
	char 	*dptr;
	char	**ptrptr;
};
#define DATUM union datum
struct item {
	char	class;
	char	lvalue;
	char	size;
	DATUM	value;
};
#define ITEM struct item
EXTERN ITEM Stackbtm[ MAXSTACKSZ ], *Stackptr, *Stacktop;
/*
 * Miscellaneous
 */
EXTERN char *Actptr;	/* pointer into Workbuf during compilation */
EXTERN char Token;	/* current input token */
EXTERN DATUM Value;	/* and its value */
EXTERN char Saw_break;	/* set when break stmt seen */
EXTERN char Where;	/* indicates whether C stmt is a PATTERN or ACTION */
EXTERN char Fieldsep[3];	/* field seperator */
EXTERN char Recordsep[3];	/* record seperator */
EXTERN char *Beginact;	/* BEGINning of input actions */
EXTERN char *Endact;	/* END of input actions */

/**********************************************************
 * Rules structure                                        *
 **********************************************************/
struct rule {
	struct {
		char *start;	/* C statements that match pattern start */
		char *stop;	/* C statements that match pattern end */
		char startseen;	/* set if both a start and stop pattern */
				/* given and if an input line matched the */
				/* start pattern */
	} pattern;
	char *action;		/* contains quasi-C statements of actions */
	struct rule *nextrule;	/* pointer to next rule */
};
#define RULE struct rule
EXTERN RULE *Rules,		/* rule structures linked list head */
	*Rulep;			/* working pointer */


/**********************************************************
 * Miscellaneous                                          *
 **********************************************************/
/*
 * Error exit values (returned to command shell)
 */
#define USAGE_ERROR	1	/* error in invokation */
#define FILE_ERROR	2	/* file not found errors */
#define RE_ERROR	3	/* bad regular expression */
#define ACT_ERROR	4	/* bad C action stmt */
#define MEM_ERROR	5	/* out of memory errors */
/*
 * Functions that return something special:
 */
char *str_compile(), *getmem(), *cclass(), *pmatch(), *fetchptr();
VARIABLE *findvar(), *addvar(), *decl();

char *newfile ();