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31 lines
750 B
C
31 lines
750 B
C
#ifdef __dietlibc__
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#include <sys/cdefs.h>
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#else
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#define __likely(x) x
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#define __unlikely(x) x
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#endif
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#include "safemult.h"
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#include "array.h"
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#if 0
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static array x;
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t *p;
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int64 pos;
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p = array_get(&x,sizeof(t),pos);
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array_get is similar to array_allocate, but it does not allocate any
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extra bytes, and it does not initialize any extra bytes. It
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returns 0 if x is unallocated, for example, or if fewer than
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(pos+1)*sizeof(t) bytes are initialized.
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#endif
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void* array_get(array* x,uint64 membersize,int64 pos) {
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uint64 wanted;
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if (__unlikely(pos+1<1)) return 0;
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if (__unlikely(!umult64(membersize,pos,&wanted))) return 0;
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if (__unlikely(wanted >= x->allocated)) return 0;
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return x->p+pos*membersize;
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}
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