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copied!<p>I'm not sure to understand your problem but why don't you try something like:</p> <pre><code>#define MEM_BUFFER 4096 #define size_t unsigned int char heap_space[MEM_BUFFER] = {0}; struct myblock { struct myblock *next; struct myblock *prev; int size; char *buffer; }; void *malloc(size_t size) { struct myblock *tmp = heap_space; if (tmp != 0) // != 0 since NULL is in stdlib while (tmp->next != 0) tmp = tmp->next; struct myblock *new_elem = tmp; //your question I guess new_elem->prev = tmp; new_elem->size = size; new_elem->buffer = new_elem + sizeof(*new_elem); new_elem->next = new_elem->buffer + new_elem->size; return (new_elem->buffer); } int main() { char *str1 = malloc(10); char *str2 = malloc(10); strcpy(str1, "Hello"); strcpy(str2, "World"); printf("%s %s\n", str1, str2); } </code></pre> <p>You should just think your memory in a different way I guess, where inside your heap_space you can have many things.</p> <p>If you don't understand something please ask.</p> <p>You should also use void * and unsigned int instead of int</p> <p>Furthermore you still have some stuff to do: </p> <ul> <li>Check if the size required is available in your array </li> <li>Give a little more space in case you want to implement your realloc </li> <li>Implement your free function</li> </ul> <p>And if you are on linux, you should try to use brk/sbrk instead of having your 'heap space'. But the greatest thing is to run 'real' programs with your own malloc (using LD_PRELOAD)</p>

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