utils.h

// Kuter Dinel 2021
// Random utilies that don't have anywhere better to go.
#ifndef UTILS_H
#define UTILS_H

#include <stddef.h>

// The macro that makes possible to get a struct from a pointer to one
// of it's fields. Used for our linked lists.
#define containerof(ptr, type, member)                                         \
    ({                                                                         \
        const typeof(((type *)0)->member) *_ptr_value = (ptr);                 \
        (type *)((void *)_ptr_value - offsetof(type, member));                 \
    })

#define COMMA(v) v,
#define STR_COMMA(v) #v,

// malloc that you can assume will always return a valid pointer.
// we might add a byte counting function later.
void *dmalloc(size_t size);
void *dzmalloc(size_t size);

#define nnew(type) (type *)dzmalloc(sizeof(type))

void writeLong(char *buffer, unsigned long num, size_t bytes);
void writeInt(char *buffer, unsigned long num, size_t bytes);
#endif