/*	$OpenBSD: makedefs.c,v 1.12 2019/06/28 13:32:52 deraadt Exp $	*/

/*
 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
 * Amsterdam
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * - Neither the name of the Stichting Centrum voor Wiskunde en
 * Informatica, 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
 * 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.
 */

/*
 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
 * All rights reserved.
 *
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
 */

#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/* construct definitions of object constants */
#define	LINSZ	1000
#define	STRSZ	40

int fd;
char string[STRSZ];

void capitalize(char *sp);
int  getentry(void);
int  skipuntil(char *s);
char nextchar(void);
void readline(void);

int
main(int argc, char **argv)
{
	int index = 0;
	int propct = 0;
	char *sp;

	if (argc != 2) {
		(void)fprintf(stderr, "usage: makedefs file\n");
		return 1;
	}
	if ((fd = open(argv[1], O_RDONLY)) == -1) {
		perror(argv[1]);
		return 1;
	}

	if (pledge("stdio", NULL) == -1)
		err(1, "pledge");

	skipuntil("objects[] = {");
	while(getentry()) {
		if(!*string){
			index++;
			continue;
		}
		for(sp = string; *sp; sp++)
			if(*sp == ' ' || *sp == '\t' || *sp == '-')
				*sp = '_';
		if(!strncmp(string, "RIN_", 4)){
			capitalize(string+4);
			printf("#define	%s	u.uprops[%d].p_flgs\n",
				string+4, propct++);
		}
		for(sp = string; *sp; sp++) capitalize(sp);
		/* avoid trouble with stupid C preprocessors */
		if(!strncmp(string, "WORTHLESS_PIECE_OF_", 19))
			printf("/* #define %s	%d */\n", string, index);
		else
			printf("#define	%s	%d\n", string, index);
		index++;
	}
	printf("\n#define	CORPSE	DEAD_HUMAN\n");
	printf("#define	LAST_GEM	(JADE+1)\n");
	printf("#define	LAST_RING	%d\n", propct);
	printf("#define	NROFOBJECTS	%d\n", index-1);
	return 0;
}

char line[LINSZ], *lp = line, *lp0 = line, *lpe = line;
int eof;

void
readline(void)
{
	int n = read(fd, lp0, (line+LINSZ)-lp0);

	if(n == -1){
		printf("Input error.\n");
		exit(1);
	}
	if(n == 0) eof++;
	lpe = lp0+n;
}

char
nextchar(void)
{
	if(lp == lpe){
		readline();
		lp = lp0;
	}
	return((lp == lpe) ? 0 : *lp++);
}

int
skipuntil(char *s)
{
	char *sp0, *sp1;

loop:
	while(*s != nextchar())
		if(eof) {
			printf("Cannot skipuntil %s\n", s);
			exit(1);
		}
	if(strlen(s) > lpe-lp+1){
		char *lp1, *lp2;
		lp2 = lp;
		lp1 = lp = lp0;
		while(lp2 != lpe) *lp1++ = *lp2++;
		lp2 = lp0;	/* save value */
		lp0 = lp1;
		readline();
		lp0 = lp2;
		if(strlen(s) > lpe-lp+1) {
			printf("error in skipuntil");
			exit(1);
		}
	}
	sp0 = s+1;
	sp1 = lp;
	while(*sp0 && *sp0 == *sp1) sp0++, sp1++;
	if(!*sp0){
		lp = sp1;
		return(1);
	}
	goto loop;
}

int
getentry(void)
{
	int inbraces = 0, inparens = 0, stringseen = 0, commaseen = 0;
	int prefix = 0;
	char ch;
#define	NSZ	10
	char identif[NSZ], *ip;

	string[0] = string[4] = 0;
	/* read until {...} or XXX(...) followed by ,
	   skip comment and #define lines
	   deliver 0 on failure
	 */
	while(1) {
		ch = nextchar();
	swi:
		if(isalpha((unsigned char)ch)){
			ip = identif;
			do {
				if(ip < identif+NSZ-1) *ip++ = ch;
				ch = nextchar();
			} while(isalpha((unsigned char)ch) || isdigit((unsigned char)ch));
			*ip = 0;
			while(ch == ' ' || ch == '\t') ch = nextchar();
			if(ch == '(' && !inparens && !stringseen)
				if(!strcmp(identif, "WAND") ||
				   !strcmp(identif, "RING") ||
				   !strcmp(identif, "POTION") ||
				   !strcmp(identif, "SCROLL"))
				(void) strncpy(string, identif, 3),
				string[3] = '_',
				prefix = 4;
		}
		switch(ch) {
		case '/':
			/* watch for comment */
			if((ch = nextchar()) == '*')
				skipuntil("*/");
			goto swi;
		case '{':
			inbraces++;
			continue;
		case '(':
			inparens++;
			continue;
		case '}':
			inbraces--;
			if(inbraces < 0) return(0);
			continue;
		case ')':
			inparens--;
			if(inparens < 0) {
				printf("too many ) ?");
				exit(1);
			}
			continue;
		case '\n':
			/* watch for #define at begin of line */
			if((ch = nextchar()) == '#'){
				char pch;
				/* skip until '\n' not preceded by '\\' */
				do {
					pch = ch;
					ch = nextchar();
				} while(ch != '\n' || pch == '\\');
				continue;
			}
			goto swi;
		case ',':
			if(!inparens && !inbraces){
				if(prefix && !string[prefix])
					string[0] = 0;
				if(stringseen) return(1);
				printf("unexpected ,\n");
				exit(1);
			}
			commaseen++;
			continue;
		case '\'':
			if((ch = nextchar()) == '\\') ch = nextchar();
			if(nextchar() != '\''){
				printf("strange character denotation?\n");
				exit(1);
			}
			continue;
		case '"':
			{
				char *sp = string + prefix;
				char pch;
				int store = (inbraces || inparens)
					&& !stringseen++ && !commaseen;
				do {
					pch = ch;
					ch = nextchar();
					if(store && sp < string+STRSZ)
						*sp++ = ch;
				} while(ch != '"' || pch == '\\');
				if(store) *--sp = 0;
				continue;
			}
		}
	}
}

void
capitalize(char *sp)
{
	*sp = (char)toupper((unsigned char)*sp);
}