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30 lines
749 B
30 lines
749 B
#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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