STAILQ_FOREACH

STAILQ_FOREACH是一个宏定义，用于遍历一个单向链表。它的语法如下：

STAILQ_FOREACH(var, head, field)

其中，var是链表中每个元素的变量名，head是链表头的指针，field是链表元素中指向下一个元素的指针域。使用STAILQ_FOREACH时，可以在循环体中操作每个元素，例如：

struct item {
    int val;
    STAILQ_ENTRY(item) entries;
};

STAILQ_HEAD(head_s, item) head;

// 添加元素到链表中
struct item *new_item = malloc(sizeof(struct item));
new_item->val = 123;
STAILQ_INSERT_TAIL(&head, new_item, entries);

// 遍历链表
struct item *current_item;
STAILQ_FOREACH(current_item, &head, entries) {
    printf("val: %d\n", current_item->val);
}

这段代码将输出：

val: 123

相关问题

PACKET_SHADOW_ENTRY *packetShadowEntryFind(PACKET_SHADOW_ENTRY_QUEUE *head, SDDM_LPP_PACKET_KEY* pPacketKey) { PACKET_SHADOW_ENTRY *cur = NULL; PACKET_SHADOW_ENTRY *next = NULL; if((NULL == head) || (NULL == pPacketKey)) { return NULL; } STAILQ_FOREACH_SAFE(cur, head, link_next, next) { if(cur->packetKey.pkt_seq == pPacketKey->pkt_seq) { return cur; } } return NULL; } 用c语言写一个ft测试用例，覆盖所有分支

以下是一个可能的测试用例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stddef.h>
#include "ft.h"

// Mock data types and functions
typedef struct {
    int pkt_seq;
} SDDM_LPP_PACKET_KEY;

typedef struct {
    SDDM_LPP_PACKET_KEY packetKey;
    int payload;
    STAILQ_ENTRY(PACKET_SHADOW_ENTRY) link_next;
} PACKET_SHADOW_ENTRY;

typedef STAILQ_HEAD(PACKET_SHADOW_ENTRY_QUEUE, PACKET_SHADOW_ENTRY) PACKET_SHADOW_ENTRY_QUEUE;

PACKET_SHADOW_ENTRY_QUEUE* mockPacketShadowEntryQueueCreate() {
    PACKET_SHADOW_ENTRY_QUEUE* queue = malloc(sizeof(PACKET_SHADOW_ENTRY_QUEUE));
    STAILQ_INIT(queue);
    return queue;
}

PACKET_SHADOW_ENTRY* mockPacketShadowEntryCreate(int pkt_seq, int payload) {
    PACKET_SHADOW_ENTRY* entry = malloc(sizeof(PACKET_SHADOW_ENTRY));
    entry->packetKey.pkt_seq = pkt_seq;
    entry->payload = payload;
    return entry;
}

void mockPacketShadowEntryQueueDestroy(PACKET_SHADOW_ENTRY_QUEUE* queue) {
    PACKET_SHADOW_ENTRY *cur, *next;
    for (cur = STAILQ_FIRST(queue); cur != NULL; cur = next) {
        next = STAILQ_NEXT(cur, link_next);
        free(cur);
    }
    free(queue);
}

// Test cases
void test_packetShadowEntryFind_given_null_queue_should_return_null() {
    PACKET_SHADOW_ENTRY_QUEUE* head = NULL;
    SDDM_LPP_PACKET_KEY packetKey = { .pkt_seq = 1 };

    PACKET_SHADOW_ENTRY* result = packetShadowEntryFind(head, &packetKey);

    if (result != NULL) {
        printf("test_packetShadowEntryFind_given_null_queue_should_return_null: Fail (result is not NULL)\n");
    }
}

void test_packetShadowEntryFind_given_null_packetKey_should_return_null() {
    PACKET_SHADOW_ENTRY_QUEUE* head = mockPacketShadowEntryQueueCreate();
    SDDM_LPP_PACKET_KEY* packetKey = NULL;

    PACKET_SHADOW_ENTRY* result = packetShadowEntryFind(head, packetKey);

    mockPacketShadowEntryQueueDestroy(head);

    if (result != NULL) {
        printf("test_packetShadowEntryFind_given_null_packetKey_should_return_null: Fail (result is not NULL)\n");
    }
}

void test_packetShadowEntryFind_given_empty_queue_should_return_null() {
    PACKET_SHADOW_ENTRY_QUEUE* head = mockPacketShadowEntryQueueCreate();
    SDDM_LPP_PACKET_KEY packetKey = { .pkt_seq = 1 };

    PACKET_SHADOW_ENTRY* result = packetShadowEntryFind(head, &packetKey);

    mockPacketShadowEntryQueueDestroy(head);

    if (result != NULL) {
        printf("test_packetShadowEntryFind_given_empty_queue_should_return_null: Fail (result is not NULL)\n");
    }
}

void test_packetShadowEntryFind_given_queue_with_one_element_matching_packetKey_should_return_element() {
    PACKET_SHADOW_ENTRY_QUEUE* head = mockPacketShadowEntryQueueCreate();
    SDDM_LPP_PACKET_KEY packetKey = { .pkt_seq = 1 };
    PACKET_SHADOW_ENTRY* element = mockPacketShadowEntryCreate(1, 10);
    STAILQ_INSERT_TAIL(head, element, link_next);

    PACKET_SHADOW_ENTRY* result = packetShadowEntryFind(head, &packetKey);

    mockPacketShadowEntryQueueDestroy(head);

    if (result != element) {
        printf("test_packetShadowEntryFind_given_queue_with_one_element_matching_packetKey_should_return_element: Fail (result is not expected element)\n");
    }
}

void test_packetShadowEntryFind_given_queue_with_one_element_not_matching_packetKey_should_return_null() {
    PACKET_SHADOW_ENTRY_QUEUE* head = mockPacketShadowEntryQueueCreate();
    SDDM_LPP_PACKET_KEY packetKey = { .pkt_seq = 1 };
    PACKET_SHADOW_ENTRY* element = mockPacketShadowEntryCreate(2, 10);
    STAILQ_INSERT_TAIL(head, element, link_next);

    PACKET_SHADOW_ENTRY* result = packetShadowEntryFind(head, &packetKey);

    mockPacketShadowEntryQueueDestroy(head);

    if (result != NULL) {
        printf("test_packetShadowEntryFind_given_queue_with_one_element_not_matching_packetKey_should_return_null: Fail (result is not NULL)\n");
    }
}

void test_packetShadowEntryFind_given_queue_with_multiple_elements_matching_packetKey_should_return_first_matching_element() {
    PACKET_SHADOW_ENTRY_QUEUE* head = mockPacketShadowEntryQueueCreate();
    SDDM_LPP_PACKET_KEY packetKey = { .pkt_seq = 1 };
    PACKET_SHADOW_ENTRY* element1 = mockPacketShadowEntryCreate(1, 10);
    PACKET_SHADOW_ENTRY* element2 = mockPacketShadowEntryCreate(1, 20);
    PACKET_SHADOW_ENTRY* element3 = mockPacketShadowEntryCreate(2, 30);
    STAILQ_INSERT_TAIL(head, element1, link_next);
    STAILQ_INSERT_TAIL(head, element2, link_next);
    STAILQ_INSERT_TAIL(head, element3, link_next);

    PACKET_SHADOW_ENTRY* result = packetShadowEntryFind(head, &packetKey);

    mockPacketShadowEntryQueueDestroy(head);

    if (result != element1) {
        printf("test_packetShadowEntryFind_given_queue_with_multiple_elements_matching_packetKey_should_return_first_matching_element: Fail (result is not expected element)\n");
    }
}

void test_packetShadowEntryFind_given_queue_with_multiple_elements_not_matching_packetKey_should_return_null() {
    PACKET_SHADOW_ENTRY_QUEUE* head = mockPacketShadowEntryQueueCreate();
    SDDM_LPP_PACKET_KEY packetKey = { .pkt_seq = 1 };
    PACKET_SHADOW_ENTRY* element1 = mockPacketShadowEntryCreate(2, 10);
    PACKET_SHADOW_ENTRY* element2 = mockPacketShadowEntryCreate(3, 20);
    PACKET_SHADOW_ENTRY* element3 = mockPacketShadowEntryCreate(4, 30);
    STAILQ_INSERT_TAIL(head, element1, link_next);
    STAILQ_INSERT_TAIL(head, element2, link_next);
    STAILQ_INSERT_TAIL(head, element3, link_next);

    PACKET_SHADOW_ENTRY* result = packetShadowEntryFind(head, &packetKey);

    mockPacketShadowEntryQueueDestroy(head);

    if (result != NULL) {
        printf("test_packetShadowEntryFind_given_queue_with_multiple_elements_not_matching_packetKey_should_return_null: Fail (result is not NULL)\n");
    }
}

int main() {
    test_packetShadowEntryFind_given_null_queue_should_return_null();
    test_packetShadowEntryFind_given_null_packetKey_should_return_null();
    test_packetShadowEntryFind_given_empty_queue_should_return_null();
    test_packetShadowEntryFind_given_queue_with_one_element_matching_packetKey_should_return_element();
    test_packetShadowEntryFind_given_queue_with_one_element_not_matching_packetKey_should_return_null();
    test_packetShadowEntryFind_given_queue_with_multiple_elements_matching_packetKey_should_return_first_matching_element();
    test_packetShadowEntryFind_given_queue_with_multiple_elements_not_matching_packetKey_should_return_null();
    return 0;
}

BOOST_FOREACH

BOOST_FOREACH是Boost库中的一个宏，用于简化C++中对可迭代对象的循环遍历。它可以用于数组、字符串以及其他STL容器（如vector、list、deque）等。BOOST_FOREACH的语法形式为BOOST_FOREACH(元素, 可迭代对象)，其中元素是用于遍历的循环变量，可迭代对象是需要进行遍历的对象。BOOST_FOREACH还提供了BOOST_REVERSE_FOREACH宏，用于反向迭代。此外，BOOST_FOREACH还可以应用于能够返回可迭代对象的函数上。