/*
	スタック／ヒープ／（静的データ）上にコードを送り込んで実行するテスト
		Sat,11 Dec,2004 - Sun,12 Dec,2004
		Copyright(C)2004 G-HAL

	原典：
Note 205       Windows (soft.windows)
[ RESPONSE: 497 of 543 ]
Title: Windows XP
Lines: 34  Date: 2004-09-06 11:46:16+09  Author: zob10016 (hiro)
*/

#include <stdlib.h>
#include <stdio.h>

#define	CODESIZE	128

static int	flag = 0;
static unsigned char evildataP[CODESIZE] = { 0 };	/* データ上に領域を確保だ */



int subfunc()
{
	return flag;
}


int main( int argc, char *argv[] )
{
	unsigned char evilstackP[CODESIZE];	/* スタック上に領域を確保だ */
	unsigned char *evilheapP;			/* ヒープ上に領域を確保だ */
	unsigned char *srcP;
	int (*evilfP)();
	int i;

	evilheapP = (unsigned char *)malloc( CODESIZE );
	srcP = (unsigned char*)subfunc;
	for( i = 0 ; i < CODESIZE ; i++ ){
		evilstackP[i] = srcP[i];
		evilheapP[i]  = srcP[i];
		evildataP[i]  = srcP[i];
	}

	evilfP = (int(*)())evilstackP;
	flag = 1;
	if( 2 <= argc ){
		switch( (argv[1])[0] ){
		case 's':
		default:
			evilfP = (int(*)())evilstackP;
			flag = 2;
			break;
		case 'h':
			evilfP = (int(*)())evilheapP;
			flag = 3;
			break;
		case 'd':
			evilfP = (int(*)())evildataP;
			flag = 4;
			break;
		}
	}
	printf("%d\n", (*evilfP)() );

	return 0;
}

/* [ EOF ] */