apfl/src/alloc.h

#ifndef APFL_ALLOC_H
#define APFL_ALLOC_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stddef.h>

#define ALLOCATOR_CALL(a, oldptr, oldsize, newsize) \
    ((a).alloc((a).opaque, (oldptr), (oldsize), (newsize)))

#define ALLOC_BYTES(a, n) (((n) == 0) ? NULL : ALLOCATOR_CALL(a, NULL, 0, (n)))
#define REALLOC_BYTES(a, ptr, old, new) ALLOCATOR_CALL(a, ptr, old, new)
#define FREE_BYTES(a, ptr, n) ALLOCATOR_CALL(a, ptr, n, 0)

#define REALLOC_LIST(a, ptr, old, new) REALLOC_BYTES(a, ptr, sizeof(*ptr) * (old), sizeof(*ptr) * (new))
#define ALLOC_LIST(a, T, len) (T *)ALLOC_BYTES(a, sizeof(T) * (len))
#define FREE_LIST(a, ptr, len) FREE_BYTES(a, ptr, sizeof(*ptr) * (len))

#define ALLOC_OBJ(a, T) ALLOC_LIST(a, T, 1)
#define FREE_OBJ(a, ptr) FREE_LIST(a, ptr, 1)

#define DEINIT_CAP_LIST(allocator, items, len, cap, item_deinit) \
do {                                                             \
    if ((items) == NULL) {                                       \
        break;                                                   \
    }                                                            \
    for (size_t i = 0; i < (len); i++) {                         \
        item_deinit(allocator, &((items)[i]));                   \
    }                                                            \
    FREE_LIST(allocator, items, cap);                            \
    len = 0;                                                     \
    cap = 0;                                                     \
    (items) = NULL;                                              \
} while(0)

#define DEINIT_LIST(allocator, items, len, item_deinit) \
    do {                                                \
        if ((items) == NULL) {                          \
            break;                                      \
        }                                               \
        for (size_t i = 0; i < (len); i++) {            \
            item_deinit(allocator, &((items)[i]));      \
        }                                               \
        FREE_LIST(allocator, items, len);               \
        len = 0;                                        \
        (items) = NULL;                                 \
    } while(0)

#define DEINIT_LIST_WITH_ARGS(allocator, items, len, item_deinit, ...) \
    do {                                                               \
        if ((items) == NULL) {                                         \
            break;                                                     \
        }                                                              \
        for (size_t i = 0; i < (len); i++) {                           \
            item_deinit(__VA_ARGS__, &((items)[i]));                   \
        }                                                              \
        FREE_LIST(allocator, items, len);                              \
        len = 0;                                                       \
        (items) = NULL;                                                \
    } while(0)

#define DEINIT_CAP_LIST_WITH_ARGS(allocator, items, len, cap, item_deinit, ...) \
    do {                                                                        \
        if ((items) == NULL) {                                                  \
            break;                                                              \
        }                                                                       \
        for (size_t i = 0; i < (len); i++) {                                    \
            item_deinit(__VA_ARGS__, &((items)[i]));                            \
        }                                                                       \
        FREE_LIST(allocator, items, cap);                                       \
        len = 0;                                                                \
        cap = 0;                                                                \
        (items) = NULL;                                                         \
    } while(0)

#define MOVEPTR(out, in) \
    do {                 \
        out = in;        \
        in = NULL;       \
    } while(0)

// DESTROY destroys a dynamically allocated value.
// It will first deinit the value using deiniter,
// free the memory and then set the variable to NULL.
// It is always allowed to destroy an already destroyed
// or deinited value.
#define DESTROY(allocator, var, deiniter) \
    do {                                  \
        if ((var) == NULL) {              \
            break;                        \
        }                                 \
        deiniter(allocator, var);         \
        FREE_OBJ(allocator, var);         \
        (var) = NULL;                     \
    } while(0)

#ifdef __cplusplus
}
#endif

#endif