/*  Header : mdef.h
    Author : Ozan Yigit
    Updated: 4 May 1992
*/
#ifndef	MACRTYPE

#ifndef unix
#define unix 0
#endif 

#ifndef vms
#define vms 0
#endif

#include <stdio.h>
#include <signal.h>

#ifdef	__STDC__
#include <string.h>
#else
#ifdef	VOID
#define void	int
#endif
extern	int	strlen();
extern	int	strcmp();
extern	void	memcpy();
#endif

/*  m4 constants */
 
#define MACRTYPE        1
#define DEFITYPE        2
#define EXPRTYPE        3
#define SUBSTYPE        4
#define IFELTYPE        5
#define LENGTYPE        6
#define CHNQTYPE        7
#define SYSCTYPE        8
#define UNDFTYPE        9
#define INCLTYPE        10
#define SINCTYPE        11
#define PASTTYPE        12
#define SPASTYPE        13
#define INCRTYPE        14
#define IFDFTYPE        15
#define PUSDTYPE        16
#define POPDTYPE        17
#define SHIFTYPE        18
#define DECRTYPE        19
#define DIVRTYPE        20
#define UNDVTYPE        21
#define DIVNTYPE        22
#define MKTMTYPE        23
#define ERRPTYPE        24
#define M4WRTYPE        25
#define TRNLTYPE        26
#define DNLNTYPE        27
#define DUMPTYPE        28
#define CHNCTYPE        29
#define INDXTYPE        30
#define SYSVTYPE        31
#define EXITTYPE        32
#define DEFNTYPE        33
#define LINETYPE	34
#define TRIMTYPE	35
#define TLITTYPE	36
#define	DEFQTYPE	37		/* defquote */
#define QUTRTYPE	38		/* quoter thus defined */

#define STATIC          128

/* m4 special characters */
 
#define ARGFLAG         '$'
#define LPAREN          '('
#define RPAREN          ')'
#define LQUOTE          '`'
#define RQUOTE          '\''
#define	VQUOTE		('V'&(' '- 1))
#define COMMA           ','
#define SCOMMT          '#'
#define ECOMMT          '\n'

/*
 * other important constants
 */

#define EOS             (char) 0
#define MAXINP          10              /* maximum include files   */
#define MAXOUT          10              /* maximum # of diversions */
#ifdef	SMALL
#define MAXSTR           512            /* maximum size of string  */
#define BUFSIZE         4096            /* size of pushback buffer */
#define STACKMAX        1024            /* size of call stack      */
#define STRSPMAX        4096            /* size of string space    */
#define HASHSIZE         199            /* maximum size of hashtab */
#else
#define MAXSTR          1024            /* maximum size of string  */
#define BUFSIZE         8192            /* size of pushback buffer */
#define STACKMAX        2048            /* size of call stack      */
#define STRSPMAX        8192            /* size of string space    */
#define HASHSIZE         509            /* maximum size of hashtab */
#endif
#define MAXTOK          MAXSTR          /* maximum chars in a tokn */
 
#define ALL             1
#define TOP             0
 
#define TRUE            1
#define FALSE           0

/* m4 data structures */
 
typedef struct ndblock *ndptr;
 
struct ndblock                  /* hashtable structure        */
    {
        char    *name;          /* entry name..               */
        char    *defn;          /* definition..               */
        int     type;           /* type of the entry..        */
        ndptr   nxtptr;         /* link to next entry..       */
    };
 
#define nil     ((ndptr) 0)
 
typedef union			/* stack structure */
    {	int	sfra;		/* frame entry  */
	char 	*sstr;		/* string entry */
    } stae;

/*
 * macros for readibility and/or speed
 *
 *      gpbc()  - get a possibly pushed-back character
 *      min()   - select the minimum of two elements
 *      pushf() - push a call frame entry onto stack
 *      pushs() - push a string pointer onto stack
 */
#define gpbc() 	 bp == bb ? getc(infile[ilevel]) : *--bp
#define min(x,y) ((x > y) ? y : x)
#define pushf(x) if (sp < STACKMAX) mstack[++sp].sfra = (x)
#define pushs(x) if (sp < STACKMAX) mstack[++sp].sstr = (x)

/*
 *	    .				   .
 *	|   .	|  <-- sp		|  .  |
 *	+-------+			+-----+
 *	| arg 3 ----------------------->| str |
 *	+-------+			|  .  |
 *	| arg 2 ---PREVEP-----+ 	   .
 *	+-------+	      |
 *	    .		      |		|     |
 *	+-------+	      | 	+-----+
 *	| plev	|  PARLEV     +-------->| str |
 *	+-------+			|  .  |
 *	| type	|  CALTYP		   .
 *	+-------+
 *	| prcf	---PREVFP--+
 *	+-------+  	   |
 *	|   .	|  PREVSP  |
 *	    .	   	   |
 *	+-------+	   |
 *	|	<----------+
 *	+-------+
 *
 */
#define PARLEV  (mstack[fp].sfra)
#define CALTYP  (mstack[fp-1].sfra)
#define PREVEP	(mstack[fp+3].sstr)
#define PREVSP	(fp-3)
#define PREVFP	(mstack[fp-2].sfra)

#endif