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将index索引转换独立出一个函数

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建峰 2025-04-30 14:53:30 +08:00
parent 65a60df00b
commit ccae6a9d8f
1 changed files with 33 additions and 35 deletions
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68
src/list.c
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@ -189,6 +189,30 @@ static void list_print(struct _list* self)
}
}
static int list_index_exchange(struct _list* self, int index)
{
assert(self != NULL);
int size = (int)self->size(self);
if (index < 0)
{
index += size;
if (index < 0)
{
index = 0;
}
}
else
{
if (index > size)
{
index = size;
}
}
return index;
}
/**
* @brief list slice
* if index < 0, from the end of list. for example:
@ -210,6 +234,9 @@ struct _list* list_slice(struct _list* self, int start, int end, int step)
int i = 0;
bool contains_last_obj = false;
int size = (int)self->size(self);
int capicity = 1;
list_t list = NULL;
if (step == 0)
{
return NULL;
@ -241,43 +268,14 @@ struct _list* list_slice(struct _list* self, int start, int end, int step)
}
}
if (start < 0)
{
if (start < -size)
{
start = -size;
}
start += size;
}
else
{
if (start > size)
{
start = size;
}
}
start = list_index_exchange(self, start);
end = list_index_exchange(self, end);
if (end < 0)
if(abs(end - start) != 0)
{
if (end < -size)
{
end = -size;
capicity = abs(end - start);
}
end += size;
}
else
{
if (end > size)
{
end = size;
}
}
// printf("start = %d\n", start);
// printf("end = %d\n", end);
uint32_t capicity = (end - start == 0) ? 1 : abs(end - start);
list_t list = list_new2(self->_obj_size, capicity);
list = list_new2(self->_obj_size, capicity);
if (list == NULL)
{
return NULL;
@ -285,7 +283,7 @@ struct _list* list_slice(struct _list* self, int start, int end, int step)
list->compare = self->compare;
list->print_obj = self->print_obj;
if (capicity == 0 || start > size || end > size)
if (start > size || end > size)
{
goto done;
}