You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
26 lines
722 B
C
26 lines
722 B
C
#include "likely.h"
|
|
#include "safemult.h"
|
|
#include "array.h"
|
|
|
|
#if 0
|
|
static array x;
|
|
t *p;
|
|
int64 pos;
|
|
|
|
p = array_get(&x,sizeof(t),pos);
|
|
|
|
array_get is similar to array_allocate, but it does not allocate any
|
|
extra bytes, and it does not initialize any extra bytes. It
|
|
returns 0 if x is unallocated, for example, or if fewer than
|
|
(pos+1)*sizeof(t) bytes are initialized.
|
|
#endif
|
|
|
|
void* array_get(const array* const x,uint64 membersize,int64 pos) {
|
|
uint64 wanted;
|
|
if (__unlikely(pos+1<1)) return 0;
|
|
if (__unlikely(!umult64(membersize,pos,&wanted))) return 0;
|
|
|
|
if (__unlikely((int64)wanted >= x->allocated || wanted>=x->initialized)) return 0;
|
|
return (void*)(x->p+pos*membersize);
|
|
}
|