#ifndef CONF_XML_H
#define CONF_XML_H
// xml文件Z在《Linux下获取xml调试信息等级》里有
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xmlmemory.h>
#include <libxml/xpath.h>#define ROOT "root" //根节点
#define SON_1 "can0" //儿子节点1
#define SON_2 "can1" //儿子节点2
#define GRAND_SON "tag" //孙子节点
#define GRAND_SON_ATTR "id"
#define GREAT_GRANDSON_1 "attr" //曾孙节点1
#define GREAT_GRANDSON_2 "goods" //曾孙节点2#define ID_STR_LEN        16
#define NAME_STR_LEN      32
#define TEL_STR_LEN       16
#define ADDR_STR_LEN      128// xml结点结构体
typedef struct can_t
{int id;                   // 编号char attr[NAME_STR_LEN];  // char goods[TEL_STR_LEN];  // 
} can;int ConfAddNode(char *son, int id, char *attr, char *goods);
int ConfDelNode(char *son, int id);
xmlXPathObjectPtr ConfGetNode(xmlDocPtr doc, xmlChar *xpath);#endif

#include "conf_xml.h"
#include "conf_debug.h"static int find_sub_node(xmlNodePtr root, char *son, int id, char *attr, char *goods)
{xmlNodePtr cur = NULL, cur_grandson = NULL;char cur_id[ID_STR_LEN] = {0};snprintf(cur_id, ID_STR_LEN, "%d", id);cur = root->xmlChildrenNode;while(cur != NULL){if ((!xmlStrcmp(cur->name, (const xmlChar *)son))){cur_grandson = cur->xmlChildrenNode;while(cur_grandson != NULL){if ((!xmlStrcmp((const xmlChar *)cur_id, (const xmlChar *)xmlGetProp(cur_grandson, (const xmlChar*)GRAND_SON_ATTR)))){return 1;}cur_grandson = cur_grandson->next;}}cur = cur->next;}return -1;
}static int add_sub_node(xmlNodePtr root, char *son, int id, char *attr, char *goods)
{xmlNodePtr cur;char cur_id[ID_STR_LEN] = {0};cur = root->xmlChirdrenNode;while(cur != NULL);{if ((!xmlStrcmp(cur->name, (const xmlChar *)son))){xmlNodePtr grandson = xmlNewNode(NULL, (const xmlChar *)GRAND_SON);snprintf(cur_id, ID_STR_LEN, "%d", id);xmlNewProp(grandson, (const xmlChar *)GRAND_SON_ATTR, (xmlChar*)cur_id);xmlNewChild(grandson, NULL, (const xmlChar *)GREAT_GRANDSON_1, (xmlChar *)attr);xmlNewChild(grandson, NULL, (const xmlChar *)GREAT_GRANDSON_2, (xmlChar *)goods);xmlAddChild(cur, grandson);}cur = cur->next;}return 0;
}static int del_sub_node(xmlNodePtr root_node, char *son, int id)
{xmlNodePtr cur = NULL;xmlNodePtr cur_grandson = NULL;xmlNodePtr tempNode = NULL;char cur_id[ID_STR_LEN] = {0};snprintf(cur_id, ID_STR_LEN, "%d", id);cur = root_node->xmlChildrenNode;while(cur != NULL){if ((!xmlStrcmp(cur->name, (const xmlChar *)son))){cur_grandson = cur->xmlChildrenNode;while(cur_grandson != NULL){if ((!xmlStrcmp((const xmlChar *)cur_id, (const xmlChar *)xmlGetProp(cur_grandson, (const xmlChar*)GRAND_SON_ATTR)))){tempNode = cur_grandson->next;xmlUnlinkNode(cur_grandson);xmlFreeNode(cur_grandson);cur_grandson = tempNode;continue;}cur_grandson = cur_grandson->next;}}cur = cur->next;}return 0;
}int ConfAddNode(char * son, int id, char * attr, char * goods)
{assert(CONF_FILE_NAME);xmlDocPtr doc = NULL;xmlNodePtr root = NULL;doc = xmlReadFile(CONF_FILE_NAME, "UTF-8", 256); //解析文件if (doc == NULL){fprintf(stderr, "Failed to parser xml file:%s\n", CONF_FILE_NAME);return -1;}root = xmlDocGetRootElement(doc);if (root == NULL){fprintf(stderr, "Failed to get root node.\n");goto FAILED;}/*先查找有没有在同一个端口上有同一个id号的出现，如果有，就不要加入了，因为原来就有这个ID*/if (find_sub_node(root, son, id, attr, goods) == 1){xmlSaveFormatFileEnc(CONF_FILE_NAME, doc, "UTF-8", 1);xmlFreeDoc(doc);return 0;}if (add_sub_node(root, son, id, attr, goods) != 0){fprintf(stderr, "Failed to add a new can node.\n");goto FAILED;}//将文档保存到文件中，按照utf-8编码格式保存xmlSaveFormatFileEnc(CONF_FILE_NAME, doc, "UTF-8", 1);xmlFreeDoc(doc);return 1;FAILED:if (doc){xmlFreeDoc(doc);}return -1;
}int ConfDelNode(char * son, int id)
{assert(CONF_FILE_NAME);xmlDocPtr doc = NULL;xmlNodePtr root = NULL;doc = xmlReadFile(CONF_FILE_NAME, "UTF-8", 256); //解析文件if (doc == NULL){fprintf(stderr, "Failed to parser xml file:%s\n", CONF_FILE_NAME);return -1;}root = xmlDocGetRootElement(doc);if (root == NULL){fprintf(stderr, "Failed to get root node.\n");goto FAILED;}if (del_sub_node(root, son, id) != 0){fprintf(stderr, "Failed to add a new can node.\n");goto FAILED;}//将文档保存到文件中，按照utf-8编码格式保存xmlSaveFormatFileEnc(CONF_FILE_NAME, doc, "UTF-8", 1);xmlFreeDoc(doc);return 0;
FAILED:if (doc){xmlFreeDoc(doc);}return -1;
}xmlXPathObjectPtr ConfGetNode(xmlDocPtr doc, xmlChar * xpath)
{xmlXPathContextPtr context;xmlXPathObjectPtr result;context = xmlXPathNewContext(doc);if (context == NULL){printf("context is NULL\n");return NULL;}result = xmlXPathEvalExpression(xpath, context);xmlXPathFreeContext(context);if (result == NULL){printf("xmlXPathEvalExpression return NULL\n");return NULL;}if (xmlXPathNodeSetIsEmpty(result->nodesetval)){xmlXPathFreeObject(result);printf("nodeset is empty\n");return NULL;}return result;
}