MemoryPrinter.c

/* Allows the user to view regions of computer memory */
#include <ctype.h>
#include <stdio.h>
typedef unsigned char BYTE;
int main(void)
{
    unsigned int addr;
    int i, n;
    BYTE *ptr;
    printf("Address of main function: %x\n", (unsigned int)main);
    printf("Address of addr variable: %x\n", (unsigned int)&addr);

    printf("\nEnter a (hex) address: ");
    scanf("%x", &addr);
    printf("Enter number of bytes to view: ");
    scanf("%d", &n);
    printf("\n");
    printf(" Address        Bytes                    Characters\n");
    printf(" ------- ------------------------------ ----------\n");
    ptr = (BYTE *)addr;
    for (; n > 0; n -= 10)
    {
        printf("%8X ", (unsigned int)ptr);
        for (i = 0; i < 10 && i < n; i++)
            printf("%.2X ", *(ptr + i));
        for (; i < 10; i++)
            printf("  ");
        printf(" ");
        for (i = 0; i < 10 && i < n; i++)
        {
            BYTE ch = *(ptr + i);
            if (!isprint(ch))
                ch = '.';
            printf("%c", ch);
        }
        printf("\n");
        ptr += 10;
    }
    return 0;
}