#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h> /*=======================================================================================
键值对（”key = valude”）字符串，在开发中经常使用；
要求1：请自己定义一个接口，实现根据key获取valude；40分
要求2：编写测试用例。30分要求3：键值对中间可能有n多空格，请去除空格30分
注意：键值对字符串格式可能如下：“key1 = valude1”
“key2 =       valude2      “
“key3  = valude3”
“key4        = valude4”
“key5   =   “
“key6   =“
“key7   =   “int getKeyByValude(char *keyvaluebuf,  char *keybuf,  char *valuebuf, int * valuebuflen);
int main()
{getKeyByValude(“key1 = valude1”, ” key1”, buf, &len);
}
==========================================================================================*/
int trimSpace(char *str,char *newstr)
{int ncount=0;int i=0,j=0;char *p=str;j=strlen(str)-1;if(str==NULL || newstr==NULL){printf("fun trimSpace() \n");return -1;}while(isspace(p[i]) && p[i]!='\0'){i++;}while(isspace(p[j]) && p[j]!='\0'){j--;}ncount=j-i+1;strncpy(newstr,str+i,ncount);  //函数原型char *strncpy(char *dest, char *src, int n)//把src所指向的字符串中以src地址开始的前n个字节复制到dest所指的数组中，并返回destnewstr[ncount] ='\0';return 0;
}int getKeyByValue(char *keyvaluebuf,char *keybuf,char *valuebuf)
{char *p=NULL; int ret=0;if(keyvaluebuf==NULL || keybuf==NULL || valuebuf==NULL){return -1;}//1.查找key在不在母串中p=keyvaluebuf;   //初始化辅助指针变量p=strstr(p,keybuf);if(p==NULL){return -1;}//让辅助指针变量  重新达到下一次检索的条件p=p+strlen(keybuf);//2.看有没有=号p=strstr(p,"=");if(p==NULL){return -1;}//让辅助指针变量  重新达到下一次检索的条件p=p+strlen("=");//3.在等号后面去除空格ret = trimSpace(p,valuebuf);if(ret!=0){printf("func trimSpace() err:%d \n", ret);return ret;}return ret;
}int main()
{int ret=0;char buf[1024]={0};char   *keyandvalue = "key2   =  valude2    ";char   *key= "key2";ret = getKeyByValue(keyandvalue,key,buf);if(ret!=0){printf("func getKeyByValue() err:%d \n",ret);return ret;}printf("buf:%s \n",buf);system("pause");return ret;
}