Function ztrycalloc_usable

src/zmalloc.cpp:171–187

Try allocating memory and zero it, and return NULL if failed. * '*usable' is set to the usable size if non NULL. */

/* Try allocating memory and zero it, and return NULL if failed.
 * '*usable' is set to the usable size if non NULL. */
void *ztrycalloc_usable(size_t size, size_t *usable) {
    ASSERT_NO_SIZE_OVERFLOW(size);
    void *ptr = calloc(1, MALLOC_MIN_SIZE(size)+PREFIX_SIZE, MALLOC_LOCAL);
    if (ptr == NULL) return NULL;

#ifdef HAVE_MALLOC_SIZE
    size = zmalloc_size(ptr);
    update_zmalloc_stat_alloc(size);
    if (usable) *usable = size;
    return ptr;
#else
    *((size_t*)ptr) = size;
    update_zmalloc_stat_alloc(size+PREFIX_SIZE);
    if (usable) *usable = size;
    return (char*)ptr+PREFIX_SIZE;
#endif
}

/* Allocate memory and zero it or panic */
void *zcalloc(size_t size, enum MALLOC_CLASS /*mclass*/) {