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

void hex_dump(char *ptr,int size,int rowsize);

void hex_dump(char *ptr,int size,int rowsize)
{
        int i = 0;
        while (i < size) {
                if (isprint(*ptr)) {
                        putchar(*ptr);
                        putchar(' ');
                } else {
                        printf("%02.2x",(*ptr & 0xff));
                }
                if ((i % rowsize) == (rowsize - 1)) {
                        putchar('\n');
                } else {
                        putchar(' ');
                }
                i++;
                ptr++;
        }
        putchar('\n');
}


main()
{

        char *pch, *pch2, *pch3;
        char *oldpch, *oldpch3;
        int size;

        pch = malloc(100);
        memset(pch,(int)'x',100);
        pch2 = malloc(100);
        memset(pch2,(int)'x',100);
        pch3 = malloc(100);
        memset(pch3,(int)'x',100);
        size = (int)(&pch3[99] - pch);
        hex_dump(pch, size, 16);
        oldpch = pch;
        free(pch);
        free(pch2);
        free(pch3);
        hex_dump(oldpch, size, 16);
}