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#include <stdckdint.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "array.h"
#include "alloc.h"
void *
(array_new)(allocator_t mem, ptrdiff_t nmemb, ptrdiff_t elemsz, ptrdiff_t align)
{
ptrdiff_t total, pad = -sizeof(_mlib_arr_hdr_t) & (align - 1);
/* Overflow; just call the allocator with the maximum size to force
proper error handling */
if (ckd_mul(&total, nmemb, elemsz)
|| ckd_add(&total, total, pad)
|| ckd_add(&total, total, sizeof(_mlib_arr_hdr_t)))
{
mem.alloc(mem, ALLOC_NEW, nullptr, 0,
PTRDIFF_MAX, PTRDIFF_MAX, PTRDIFF_MAX);
unreachable();
}
uint8_t *buf = new(mem, uint8_t, total);
_mlib_arr_hdr_t hdr = {0, nmemb, mem};
memcpy(buf, &hdr, sizeof(hdr));
return buf + sizeof(_mlib_arr_hdr_t) + pad;
}
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