EMS/kit/kit_xml.c

#include "kit_xml.h"
 
//初始化结构体
static void set_item(EMS_XML *EMS_XML_item)
{
    assert(EMS_XML_item);
 
    EMS_XML_item->id = 1;
    snprintf(EMS_XML_item->can_recv_name, NAME_STR_LEN, "%s", "can0");
    snprintf(EMS_XML_item->can_send_name, NAME_STR_LEN, "%s", "can1");
    snprintf(EMS_XML_item->can_id_name, NAME_STR_LEN, "%s", "3");
    snprintf(EMS_XML_item->can_recv_dlc, NAME_STR_LEN, "%s", "8");
    snprintf(EMS_XML_item->can_send_dlc, NAME_STR_LEN, "%s", "8");
    snprintf(EMS_XML_item->ems_local_ip, NAME_STR_LEN, "%s", "192.168.0.111");
}
 
//创建节点
static xmlNodePtr create_node(const EMS_XML *EMS_XML_item)
{
    //确保传入的指针不为空，避免后续对空指针进行不当操作
    assert(EMS_XML_item);
    
    char id[NAME_STR_LEN] = {0};
    xmlNodePtr EMS_XML_node = NULL;
    
    //BAD_CAST是一个将C风格字符串转成xmlChar*的宏
    EMS_XML_node = xmlNewNode(NULL, BAD_CAST"EMS_XML");
    if (EMS_XML_node == NULL) {
    fprintf(stderr, "Failed to create new node.\n");
    return NULL;
    }
    //设置属性
    snprintf(id, NAME_STR_LEN, "%d", EMS_XML_item->id);
    //xmlNewProp设置属性
    xmlNewProp(EMS_XML_node, BAD_CAST"id", (xmlChar*)id);
 
    xmlNewChild(EMS_XML_node, NULL, BAD_CAST"can_recv_name", (xmlChar *)EMS_XML_item->can_recv_name);
    xmlNewChild(EMS_XML_node, NULL, BAD_CAST"can_send_name", (xmlChar *)EMS_XML_item->can_send_name);
    xmlNewChild(EMS_XML_node, NULL, BAD_CAST"can_id_name", (xmlChar *)EMS_XML_item->can_id_name);
    xmlNewChild(EMS_XML_node, NULL, BAD_CAST"can_recv_dlc", (xmlChar *)EMS_XML_item->can_recv_dlc);
    xmlNewChild(EMS_XML_node, NULL, BAD_CAST"can_send_dlc", (xmlChar *)EMS_XML_item->can_send_dlc);
    xmlNewChild(EMS_XML_node, NULL, BAD_CAST"ems_local_ip", (xmlChar *)EMS_XML_item->ems_local_ip);
 
    return EMS_XML_node;
}
 
//向根节点中添加一个节点
static int add_node_to_root(xmlNodePtr root_node)
{
    xmlNodePtr EMS_XML_node = NULL;
    EMS_XML *EMS_XML_item = NULL;
 
    //创建一个新的item
    EMS_XML_item = (EMS_XML *)malloc(sizeof(EMS_XML));
    if (EMS_XML_item == NULL) {
    fprintf(stderr, "Failed to malloc memory.\n");
    return -1;
    }
    set_item(EMS_XML_item);
 
    //创建一个节点
    EMS_XML_node = create_node(EMS_XML_item); 
    if (EMS_XML_node == NULL) {
    fprintf(stderr, "Failed to create EMS_XML node.\n");
    goto FAILED;
    }
    //根节点添加一个子节点
    xmlAddChild(root_node, EMS_XML_node);
    free(EMS_XML_item);
 
    return 0;
FAILED:
    if (EMS_XML_item){
    free(EMS_XML_item);
    }
    return -1;
}
 
//创建xml文档
static int create_EMS_XML_file(const char *EMS_XML_file)
{
    assert(EMS_XML_file);
 
    xmlDocPtr doc = NULL;
    xmlNodePtr root_node = NULL;
 
    //创建一个xml 文档
    doc = xmlNewDoc(BAD_CAST"1.0");
    if (doc == NULL) {
    fprintf(stderr, "Failed to new doc.\n");
    return -1;
    }
 
    //创建根节点
    root_node = xmlNewNode(NULL, BAD_CAST"EMS_root");
    if (root_node == NULL) {
    fprintf(stderr, "Failed to new root node.\n");
    goto FAILED;
    }
    //将根节点添加到文档中
    xmlDocSetRootElement(doc, root_node);
 
    if (add_node_to_root(root_node) != 0) {
    fprintf(stderr, "Failed to add a new EMS_XML node.\n");
    goto FAILED;
    }
    //将文档保存到文件中，按照utf-8编码格式保存
    xmlSaveFormatFileEnc(EMS_XML_file, doc, "UTF-8", 1);
    //xmlSaveFile("test.xml", doc);
    xmlFreeDoc(doc);
 
    return 0; 
FAILED:
    if (doc) {
    xmlFreeDoc(doc);
    }
 
    return -1;
}
 
static int add_node(const char *EMS_XML_file)
{
    assert(EMS_XML_file);
 
    xmlDocPtr doc = NULL;
    xmlNodePtr root_node = NULL;
    xmlNodePtr EMS_XML_node = NULL;
    EMS_XML *EMS_XML_item = NULL;
    
    doc = xmlParseFile(EMS_XML_file);
    if (doc == NULL) {
    fprintf(stderr, "Failed to parser xml file:%s\n", EMS_XML_file);
    return -1;
    }
 

    root_node = xmlDocGetRootElement(doc);
    if (root_node == NULL) {
    fprintf(stderr, "Failed to get root node.\n");
    goto FAILED;
    }
    
    //向根节点添加子节点
    if (add_node_to_root(root_node) != 0) {
    fprintf(stderr, "Failed to add a new EMS_XML node.\n");
    goto FAILED;
    }
    //将文档保存到文件中，按照utf-8编码格式保存
    xmlSaveFormatFileEnc(EMS_XML_file, doc, "UTF-8", 1);
    xmlFreeDoc(doc);
 
    return 0;
FAILED:
    if (doc) {
    xmlFreeDoc(doc);
    }
 
    return -1;
}
 
/*--------------------------para function--------------------------*/
static int parse_EMS_XML_node(xmlDocPtr doc, xmlNodePtr cur)
{
    assert(doc || cur);
    xmlChar *key;
 
    cur = cur->xmlChildrenNode;
    while (cur != NULL) {
    if ((!xmlStrcmp(cur->name, (const xmlChar *)"can_recv_name"))) {
        key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
        printf("can_recv_name: %s\t", key);
        xmlFree(key);
    }
  
    if ((!xmlStrcmp(cur->name, (const xmlChar *)"can_send_name"))) {
        key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
        printf("can_send_name: %s\t", key);
        xmlFree(key);
    }
  
    if ((!xmlStrcmp(cur->name, (const xmlChar *)"can_id_name"))) {
        key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
        printf("can_id_name: %s\n", key);
        xmlFree(key);
    }

    if ((!xmlStrcmp(cur->name, (const xmlChar *)"can_recv_dlc"))) {
        key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
        printf("can_recv_dlc: %s\t", key);
        xmlFree(key);
    }
  
    if ((!xmlStrcmp(cur->name, (const xmlChar *)"can_send_dlc"))) {
        key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
        printf("can_send_dlc: %s\n", key);
        xmlFree(key);
    }
    if ((!xmlStrcmp(cur->name, (const xmlChar *)"ems_local_ip"))) {
        key = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
        int fd;
        char buffer[1024];
        ssize_t bytes_read, bytes_written;
        fd = open("/etc/netplan/01-netcfg.yaml", O_RDWR);
        if (fd == -1)
        {
            perror("open the netcfg failed!");
            return 1;
        }

        // 读取文件内容
        bytes_read = read(fd, buffer, 1024);
        if (bytes_read == -1) {
            perror("read file failed!");
            close(fd);
            return 1;
        } else if (bytes_read == 0) {
            printf("the file is empty\n");
            close(fd);
            return 0;
        }
        buffer[bytes_read] = '\0';

        // 定位包含 "addresses:" 的行
        char *addresses_line = strstr(buffer, "addresses:");
        if (addresses_line!= NULL) {
            // 定位冒号位置
            char *colon_pos = strchr(addresses_line, ':');
            if (colon_pos!= NULL) {
                colon_pos++;
                // 跳过可能的空格等字符，找到IP地址起始位置
                while (*colon_pos!= '\0' && isspace(*colon_pos)) {
                    colon_pos++;
                }
                // 记录IP地址起始位置
                char *ip_start = colon_pos;
                // 找到IP地址结束位置（遇到逗号、换行符或右方括号且下一个字符不是数字）
                char *ip_end = ip_start;
                while (*ip_end!= '\0' && *ip_end!= ',' && *ip_end!= '\n' &&
                    ((*ip_end!= ']') || ((*ip_end == ']') && (!isdigit(*(ip_end + 1)))))) {
                    ip_end++;
                }
                // 计算IP地址部分的长度
                size_t ip_length = ip_end - ip_start;
                // 替换IP地址
                memmove(colon_pos, key, strlen(key));
                // 将剩余部分移动到新位置
                memmove(colon_pos + strlen(key), ip_end, strlen(ip_end));
            }
        }

        // 将文件指针移回文件开头
        lseek(fd, 0, SEEK_SET);

        // 将修改后的内容写回文件
        bytes_written = write(fd, buffer, strlen(buffer));
        if (bytes_written == -1) {
            perror("write");
            close(fd);
            return 1;
        }

        // 关闭文件
        close(fd);

        printf("ems_local_ip: %s\n", key);
        xmlFree(key);
    }
    cur = cur->next;
    }
    return 0;
}
 
static int parse_EMS_XML(const char *file_name)
{
    assert(file_name);
 
    xmlDocPtr doc;   //xml整个文档的树形结构
    xmlNodePtr cur;  //xml节点
    xmlChar *id;     
 
    //获取树形结构
    doc = xmlParseFile(file_name);
    if (doc == NULL) {
    fprintf(stderr, "Failed to parse xml file:%s\n", file_name);
    goto FAILED;
    }
 
    //获取根节点
    cur = xmlDocGetRootElement(doc);
    if (cur == NULL) {
    fprintf(stderr, "Root is empty.\n");
    goto FAILED;
    }
 
    if ((xmlStrcmp(cur->name, (const xmlChar *)"EMS_root"))) {
    fprintf(stderr, "The root is not EMS_root.\n");
    goto FAILED;
    }
 
    //遍历处理根节点的每一个子节点
    cur = cur->xmlChildrenNode;
    while (cur != NULL) {
    if ((!xmlStrcmp(cur->name, (const xmlChar *)"EMS_XML"))) {
        id = xmlGetProp(cur, "id");
        printf("id:%s\t",id);
        parse_EMS_XML_node(doc, cur);
    }
    cur = cur->next;
    }
    xmlFreeDoc(doc);
    return 0;
FAILED:
    if (doc) {
    xmlFreeDoc(doc);
    }
    return -1;
}
 
void paraXml()
{
    char *xml_file = DEFAULT_XML_FILE;
 
    printf("para xml function:\n");
    if (parse_EMS_XML(xml_file) != 0) {
        fprintf(stderr, "Failed to parse EMS_XML_file.\n");
        exit(EXIT_FAILURE);
    }
 
}


void createXml()
{
    char *EMS_XML_file = EMS_XML_FILE;
 
    printf("create function:\n");
    if (access(EMS_XML_file, F_OK) == 0) {
        printf("The %s is exist!, please modify the file directly!\n", EMS_XML_file);
    }
    else {
        //文件不存在，创建一个
        create_EMS_XML_file(EMS_XML_file);
    }
}