hacking.h - Error Handler/Utility Functions

/**
 * [hacking.h]
 *
 * General purpose (error handler/utility) functions.
 */
#ifndef HACKING_H
#define HACKING_H

#include <stdio.h>      /* for perror()                 */
#include <stdlib.h>     /* for malloc()                 */
#include <string.h>     /* for strcpy() and strncat()   */

/**
 * The fatal() function:
 *
 * A function to display an error message and then exit.
 */
void fatal(char *message)
{
    char    error_message[100];

    strcpy(error_message, "[!!] Fatal Error ");
    strncat(error_message, message, 83);
    perror(error_message);

    exit(-1);
}


/**
 * The ec_malloc() function:
 *
 * An error-checked malloc() wrapper function.
 */
void *ec_malloc(unsigned int size)
{
    void    *ptr;

    ptr = malloc(size);

        if(ptr == NULL)
            fatal("in ec_malloc() on memory allocation");

    return ptr;
}

/**
 * The dump() function:
 *
 * A function that dumps raw memory in hex byte and printable split format.
 */
void dump(const unsigned char *data_buffer, const unsigned int length)
{
    unsigned    char    byte;
    unsigned    int     i;
    unsigned    int     j;

        for(i = 0; i < length; i++)
        {
            byte = data_buffer[i];

            printf("%02x ", data_buffer[i]);                            /* Display byte in hex format. */

                if(((i % 16) == 15) || (i == (length - 1)))
                {
                        for(j = 0; j < (15 - (i % 16)); j++)
                            printf("   ");

                    printf("| ");

                        for(j = (i - (i % 16)); j <= i; j++)            /* Display printable bytes from line... */
                        {
                            byte = data_buffer[j];

                                if((byte > 31) && (byte < 127))         /* ...outside printable char range. */
                                    printf("%c", byte);
                                else
                                    printf(".");
                        }

                    printf("\n");                                       /* End of the dump line (each line 16 bytes). */
                }
        }
}

#endif