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darray.h: avoid UB when decrementing zero pointer #81

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darray.h: avoid UB when decrementing zero pointer #81

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4 changes: 2 additions & 2 deletions ccan/darray/darray.h
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Original file line number Diff line number Diff line change
Expand Up @@ -310,8 +310,8 @@ static inline size_t darray_next_alloc(size_t alloc, size_t need)
*
* Like darray_foreach, but traverse in reverse order.
*/
#define darray_foreach_reverse(i, arr) \
for ((i) = &(arr).item[(arr).size]; (i)-- > &(arr).item[0]; )
#define darray_foreach_reverse(ptr, arr) \
for (size_t _i = 0; _i < (arr).size && ((ptr) = &(arr).item[(arr).size - _i]); ++_i)


#endif /* CCAN_DARRAY_H */
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