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实现 xy_seq_pop()

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Aoran Zeng 2025-08-20 13:31:15 +08:00
parent e2c8525027
commit 77a3b458bd
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1 changed files with 37 additions and 12 deletions
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49
lib/xy.h
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@ -1085,6 +1085,7 @@ XySeq_t;
typedef struct XySeqItem_t typedef struct XySeqItem_t
{ {
XySeqItem_t *prev;
XySeqItem_t *next; XySeqItem_t *next;
void *data; void *data;
@ -1109,7 +1110,7 @@ xy_new_seq (void)
/** /**
* @flavor Perl: push * @flavor Perl: push
*/ */
XySeq_t* void
xy_seq_push (XySeq_t *seq, void *data) xy_seq_push (XySeq_t *seq, void *data)
{ {
if (!seq) return NULL; if (!seq) return NULL;
@ -1118,25 +1119,49 @@ xy_seq_push (XySeq_t *seq, void *data)
if (!it) return NULL; if (!it) return NULL;
it->data = data; it->data = data;
it->prev = NULL;
it->next = NULL; it->next = NULL;
if (seq->last) // 更新 item 间关系
if (XySeqItem_t *l = seq->last_item;)
{ {
// 旧的最后项成为倒数第二项 it->prev = l;
seq->last_item->next = it; l->next = it;
} }
// it 成为新的最后一项
seq->last_item = it;
// 若 seq 为空，成为第一项 // 更新 seq 信息
if (!seq->first_item) seq->last_item = it;
{ if (0==seq->length)
seq->first_item = it; seq->first_item = it;
}
seq->length++; seq->length++;
}
return seq;
/**
* @flavor Perl: pop
*/
void *
xy_seq_pop (XySeq_t *seq)
{
if (!seq || 0==seq->length) return NULL;
// 更新 item 间关系
XySeqItem_t *l = seq->last_item;
XySeqItem_t *p = l->prev;
// 考虑 seq 当前只有1项的情况
if (p) p->next = NULL;
l->prev = NULL;
// 更新 seq 信息
seq->last_item = p;
// 考虑 seq 当前只有1项的情况
if (!p) seq->first_item = NULL;
seq->length--;
void *data = l->data;
free (l);
return data;
} }
#endif #endif