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#include <errno.h> // for errno, EINVAL, ENOMEM
#include <stdlib.h> // for calloc, malloc
#include <string.h> // for size_t, memset
void *calloc(size_t nelem, size_t elsize)
{
void *ptr;
size_t total;
if (nelem == 0 || elsize == 0) {
errno = EINVAL;
return NULL;
}
if (__builtin_mul_overflow(nelem, elsize, &total)) {
errno = ENOMEM;
return NULL;
}
ptr = malloc(total);
if (ptr != NULL) {
memset(ptr, 0, total);
}
return ptr;
}
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