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[fix]fix the bugs of overmemory in buddy2_size function. #4

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[fix]fix the bugs of overmemory in buddy2_size function. #4

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15 changes: 9 additions & 6 deletions buddy2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8,12 +8,12 @@ struct buddy2 {
unsigned longest[1];
};

#define LEFT_LEAF(index) ((index) * 2 + 1)
#define RIGHT_LEAF(index) ((index) * 2 + 2)
#define PARENT(index) ( ((index) + 1) / 2 - 1)
#define LEFT_LEAF(index) ((index) * 2 + 1)
#define RIGHT_LEAF(index) ((index) * 2 + 2)
#define PARENT(index) (((index) + 1) / 2 - 1)

#define IS_POWER_OF_2(x) (!((x)&((x)-1)))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define IS_POWER_OF_2(x) (!((x)&((x)-1)))
#define MAX(a, b) ((a) > (b) ? (a) : (b))

#define ALLOC malloc
#define FREE free
Expand Down Expand Up @@ -123,8 +123,11 @@ int buddy2_size(struct buddy2* self, int offset) {
assert(self && offset >= 0 && offset < self->size);

node_size = 1;
for (index = offset + self->size - 1; self->longest[index] ; index = PARENT(index))
for (index = offset + self->size - 1; self->longest[index] ; index = PARENT(index)) {
node_size *= 2;
if (index == 0)
break;
}

return node_size;
}
Expand Down