/*      $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);
}