malloc macro

malloc_init.c

/* method is documentented here https://tia.mat.br/posts/2015/05/01/initializing_a_heap_allocated_structure_in_c.html */

#define ALLOC_INIT(type, ...)   \
        (type *)memdup((type[]){ __VA_ARGS__ }, sizeof(type))

void *memdup(const void *src, size_t sz) {
	void *mem = malloc(sz);
	return mem ? memcpy(mem, src, sz) : NULL;
}

#if defined(__GCC__)
__auto_type foobar = ALLOC_INIT(struct foobar, {
	.field = value,
	.other_field = other_value,
	.yet_another_field = yet_another_value
});
#else
struct foobar *foobar = ALLOC_INIT(struct foobar, {
	.field = value,
	.other_field = other_value,
	.yet_another_field = yet_another_value
});
#endif