Simple web server with bug - hacking.h

/* hacking.h - simple web server */

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

// 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);
}

// 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;
}

// 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, j;
    for(i=0; i < length; i++) {
        byte = data_buffer[i];
        printf("%02x ", data_buffer[i]);  // display byte in hex
        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)
        } // end if
    } // end for
}