null.h

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// and just uses malloc/calloc/free.
 
#ifndef NULLALLOC_H
#define NULLALLOC_H
 
#include <derive-c/core.h>
#include <derive-c/panic.h>
#include <stdlib.h>
 
#ifdef __cplusplus
struct nullalloc {
    char UNUSED(_dummy_cpp_object_size_compatibility);
};
#else
typedef struct {
} nullalloc;
#endif
 
static nullalloc NAME(nullalloc, get)() { return (nullalloc){}; }
 
static void* NAME(nullalloc, malloc)(nullalloc* DEBUG_UNUSED(self), size_t UNUSED(size)) {
    DEBUG_ASSERT(self);
    return NULL;
}
 
static void* NAME(nullalloc, realloc)(nullalloc* DEBUG_UNUSED(self), void* DEBUG_UNUSED(ptr),
                                      size_t UNUSED(size)) {
    DEBUG_ASSERT(self);
    DEBUG_ASSERT(ptr);
    return NULL;
}
 
static void* NAME(nullalloc, calloc)(nullalloc* DEBUG_UNUSED(self), size_t UNUSED(count),
                                     size_t UNUSED(size)) {
    DEBUG_ASSERT(self);
    return NULL;
}
 
static void NAME(nullalloc, free)(nullalloc* DEBUG_UNUSED(self), void* UNUSED(ptr)) {
    DEBUG_ASSERT(self);
    PANIC("Not possible to free memory from the null allocator, as it allocates nothing")
}
 
#endif