/*	$OpenBSD: mdef.h,v 1.33 2015/11/03 16:21:47 deraadt Exp $	*/
/*	$NetBSD: mdef.h,v 1.7 1996/01/13 23:25:27 pk Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ozan Yigit at York University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)mdef.h	8.1 (Berkeley) 6/6/93
 */

#ifdef __GNUC__
# define UNUSED	__attribute__((__unused__))
#else
# define UNUSED
#endif

#define MACROTYPE		1
#define DEFINETYPE		2
#define EVALTYPE		3
#define SUBSTRTYPE		4
#define IFELSETYPE		5
#define LENTYPE			6
#define CHANGEQUOTETYPE		7
#define SYSCMDTYPE		8
#define UNDEFINETYPE		9
#define INCLUDETYPE		10
#define SINCLUDETYPE		11
#define PASTETYPE		12
#define SPASTETYPE		13
#define INCRTYPE		14
#define IFDEFTYPE		15
#define PUSHDEFTYPE		16
#define POPDEFTYPE		17
#define SHIFTTYPE		18
#define DECRTYPE		19
#define DIVERTTYPE		20
#define UNDIVERTTYPE		21
#define DIVNUMTYPE		22
#define MKSTEMPTYPE		23
#define ERRPRINTTYPE		24
#define M4WRAPTYPE		25
#define TRANSLITTYPE		26
#define DNLTYPE			27
#define DUMPDEFTYPE		28
#define CHANGECOMTYPE		29
#define INDEXTYPE		30
#define SYSVALTYPE		31
#define M4EXITTYPE		32
#define DEFNTYPE		33
#define SELFTYPE		34
#define INDIRTYPE		35
#define BUILTINTYPE		36
#define PATSUBSTTYPE		37
#define FILENAMETYPE		38
#define LINETYPE		39
#define REGEXPTYPE		40
#define ESYSCMDTYPE		41
#define TRACEONTYPE		42
#define TRACEOFFTYPE		43
#define FORMATTYPE		44

#define BUILTIN_MARKER	"__builtin_"

#define TYPEMASK	63	/* Keep bits really corresponding to a type. */
#define RECDEF		256	/* Pure recursive def, don't expand it */
#define NOARGS		512	/* builtin needs no args */
#define NEEDARGS	1024	/* mark builtin that need args with this */

/*
 * m4 special characters
 */

#define ARGFLAG         '$'
#define LPAREN          '('
#define RPAREN          ')'
#define LQUOTE          '`'
#define RQUOTE          '\''
#define COMMA           ','
#define SCOMMT          '#'
#define ECOMMT          '\n'

/*
 * other important constants
 */

#define EOS             '\0'
#define MAXINP          10              /* maximum include files	    */
#define MAXOUT          10              /* maximum # of diversions	    */
#define BUFSIZE         4096            /* starting size of pushback buffer */
#define INITSTACKMAX    4096		/* starting size of call stack      */
#define STRSPMAX        4096            /* starting size of string space    */
#define MAXTOK          512		/* maximum chars in a tokn	    */
#define MAXCCHARS	5		/* max size of comment/quote delim  */

#define ALL             1
#define TOP             0

#define TRUE            1
#define FALSE           0
#define cycle           for(;;)

/*
 * m4 data structures
 */

typedef struct ndblock *ndptr;

struct macro_definition {
	struct macro_definition *next;
	char		*defn;	/* definition..               */
	unsigned int	type;	/* type of the entry..        */
};


struct ndblock {			/* hashtable structure         */
	unsigned int		builtin_type;
	unsigned int		trace_flags;
	struct macro_definition *d;
	char		name[1];	/* entry name..               */
};

typedef union {			/* stack structure */
	int	sfra;		/* frame entry  */
	char	*sstr;		/* string entry */
} stae;

struct input_file {
	FILE		*file;
	char		*name;
	unsigned long	lineno;
	unsigned long   synch_lineno;	/* used for -s */
	int		c;
};

#define STORAGE_STRSPACE 0
#define STORAGE_MACRO 1
#define STORAGE_OTHER 2

#define CURRENT_NAME	(infile[ilevel].name)
#define CURRENT_LINE	(infile[ilevel].lineno)
/*
 * macros for readibility and/or speed
 *
 *      gpbc()  - get a possibly pushed-back character
 *      pushf() - push a call frame entry onto stack
 *      pushs() - push a string pointer onto stack
 */
#define gpbc()	 (bp > bufbase) ? *--bp : obtain_char(infile+ilevel)
#define pushf(x)			\
	do {				\
		if (++sp == (int)STACKMAX)	\
			enlarge_stack();\
		mstack[sp].sfra = (x);	\
		sstack[sp] = STORAGE_OTHER; \
	} while (0)

#define pushs(x)			\
	do {				\
		if (++sp == (int)STACKMAX)	\
			enlarge_stack();\
		mstack[sp].sstr = (x);	\
		sstack[sp] = STORAGE_STRSPACE; \
	} while (0)

#define pushs1(x)			\
	do {				\
		if (++sp == (int)STACKMAX)	\
			enlarge_stack();\
		mstack[sp].sstr = (x);	\
		sstack[sp] = STORAGE_OTHER; \
	} while (0)

#define pushdef(p)			\
	do {				\
		if (++sp == (int)STACKMAX)	\
			enlarge_stack();\
		mstack[sp].sstr = macro_getdef(p)->defn;\
		sstack[sp] = STORAGE_MACRO; \
	} while (0)


/*
 *	    .				   .
 *	|   .	|  <-- sp		|  .  |
 *	+-------+			+-----+
 *	| arg 3 ----------------------->| str |
 *	+-------+			|  .  |
 *	| arg 2 ---PREVEP-----+		   .
 *	+-------+	      |
 *	    .		      |		|     |
 *	+-------+	      |		+-----+
 *	| plev	|  PARLEV     +-------->| str |
 *	+-------+			|  .  |
 *	| type	|  CALTYP		   .
 *	+-------+
 *	| prcf	---PREVFP--+
 *	+-------+	   |
 *	|   .	|  PREVSP  |
 *	    .		   |
 *	+-------+	   |
 *	|	<----------+
 *	+-------+
 *
 */
#define PARLEV  (mstack[fp].sfra)
#define CALTYP  (mstack[fp-2].sfra)
#define TRACESTATUS (mstack[fp-1].sfra)
#define PREVEP	(mstack[fp+3].sstr)
#define PREVSP	(fp-4)
#define PREVFP	(mstack[fp-3].sfra)
