From: "strikes" <lock AT omen DOT com DOT au>
Newsgroups: comp.os.msdos.djgpp
Subject: DJGPP 2.8.1 Major Bug, Do NOT ignore!
Date: Wed, 25 Nov 1998 20:08:16 +0800
Organization: Omen Internet
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hello, I was trying to create a Conways Life simulator in DJGPP using Rhide
underneath Windoze 98 when I discovered that when I tried to
if (life1[X1][Y1-1] == 1) that the -1 did not seem to do anything. I tried
doing different variations on it but it failed. I am certain that I am doing
nothing wrong and I seriously do not know what is wrong. Anyhow, I have
included the infected program below.



   ---Infected C programs starts below---
#include <conio.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <pc.h>
//#include "ascii.h"

#define DIE

int life1[100][100];
int life2[100][100];
int neighbours;

typedef unsigned char byte;
int Chr,Col,Rep;

void putchr(byte Chr, byte Col, long Rep)
{
   __asm__ __volatile__("
   movb $0x09, %%ah\n
   movb %0, %%al\n
   movb $0x00, %%bh\n
   movb %1, %%bl\n
   movw %2, %%cx\n
   int  $0x10\n"
   :
   : "g" (Chr), "g" (Col), "g" (Rep)
   );
}

int processlife(int number, int X0, int Y0)
{
   int X1,Y1;
   int X3,Y3;
   int CsucksX,CsucksY; // failed debug attempts led to these names

   X1 = X0; Y1 = Y0;

/* for (X3 = 1; X3 < 80; X3++) {
    for (Y3 = 1; Y3 < 25; Y3++) {
     if (number == 1) {life2[X3][Y3] = 0;} else {life1[X3][Y3] = 0;}
   }} */

   if (X1 > 0) { if (number == 1) {if (life1[X1-1][Y1] == 1)
{ neighbours++; }} else {if (life2[X1-1][Y1] == 1) { neighbours++; }}}
// if (X1 < 79) { if (number == 1) {if (life1[X1+1][Y1] == 1)
 neighbours++; }} else {if (life2[X1+1][Y1] == 1) { neighbours++; }}}
   if (Y1 > 0) { if (number == 1) {if (life1[X1][Y1-1] == 1)
{ neighbours++; }} else {if (life2[X1][Y1-1] == 1) { neighbours++; }}}
// if (Y1 < 24) { if (number == 1) {if (life1[X1][Y1+1] == 1)
 neighbours++; }} else {if (life2[X1][Y1+1] == 1) { neighbours++; }}}
// if ((X1 > 0) && (Y1 > 0)) { if (number == 1) {if (life1[X1-1][Y1-1] == 1)
{ neighbours++; }} else {if (life2[X1-1][Y1-1] == 1) { neighbours++; }}}
// if ((X1 < 79) && (Y1 < 24)) { if (number == 1) {if (life1[X1+1][Y1+1] ==
1) { neighbours++; }} else {if (life2[X1+1][Y1+1] == 1) { neighbours++; }}}
// if ((X1 > 0) && (Y1 < 24)) { if (number == 1) {if (life1[X1-1][Y1+1] ==
1) { neighbours++; }} else {if (life2[X1-1][Y1+1] == 1) { neighbours++; }}}
// if ((X1 < 79) && (Y1 > 0)) { if (number == 1) {if (life1[X1+1][Y1-1] ==
1) { neighbours++; }} else {if (life2[X1+1][Y1-1] == 1) { neighbours++; }}}

   if(neighbours<2) {if (number == 1) { life1[X1][Y1] = 0;} else
 life2[X1][Y1] = 0;}}
   if(neighbours==3) {if (number == 1) { life1[X1][Y1] = 1;} else
 life2[X1][Y1] = 1;}}
   if(neighbours>3) {if (number == 1) { life1[X1][Y1] = 0;} else
 life2[X1][Y1] = 0;}}

   gotoxy(1,1); cprintf("%d : %d : %d : %d ;
%d",neighbours,number,X1,Y1,(Y1-1));
   gotoxy(X1,Y1);
   if (number == 1) { if (life1[X1][Y1] == 1) { cprintf("*"); }}
   if (number == 2) { if (life2[X1][Y1] == 1) { cprintf("*"); }}
   if (neighbours > 0) {getch(); cprintf("%d",neighbours);} else {}
   neighbours = 0;
}

printlife(int number)
{
   int X2,Y2;

   for (X2 = 1; X2 < 80; X2++) {
    for (Y2 = 1; Y2 < 25; Y2++) {
      gotoxy(X2,Y2);
      if (number == 1) {if (life1[X2][Y2] == 1) {putchr(219,15,1);} else
{putchr(32,15,1);}} else if (life2[X2][Y2] == 1) {putchr(219,15,1);} else
{putchr(32,15,1);}
   }}
}

main()
{
   int i,X,Y;

   clrscr();
   life1[10][10] = 1; life1[11][10] = 1; life1[12][10] = 1;
   life2[10][10] = 1; life2[11][10] = 1; life2[12][10] = 1;

   for (i = 1; i < 100; i++)
   {
      delay(1000);

      for (X = 1; X < 80; X++){
       for (Y = 1; Y < 25; Y++){
        processlife(1,X,Y);
      }}
        printlife(2);
        delay(1000);
      for (X = 1; X < 80; X++){
       for (Y = 1; Y < 25; Y++){
        processlife(2,X,Y);
      }}
        printlife(1);
        delay(1000);
   }
}