c语言实现名值对通过key查找value

需求、例如:

1、" key1 = value1 " 通过"key1"从该字符串中查找出"value",value去除前后空格

2、" key1 == value1 " 、" key1 = = value1 " 双等于号不合法

头文件:

#include<stdlib.h>
#include<stdio.h>
#include<string.h>

函数原型:

void trim(char *strIn /*in*/, char *strOut /*out*/);

void getValue(char * keyAndValue  /*in*/, char * key  /*in*/, char * value /*out*/);

实现方法:

 void trim(char *strIn, char *strOut){

     char *start, *end, *temp;//定义去除空格后字符串的头尾指针和遍历指针

     temp = strIn;

     while (*temp == ' '){
         ++temp;
     }

     start = temp; //求得头指针

     temp = strIn + strlen(strIn) - ; //得到原字符串最后一个字符的指针(不是'\0')

     while (*temp == ' '){
         --temp;
     }

     end = temp; //求得尾指针

     for(strIn = start; strIn <= end; ){
         *strOut++ = *strIn++;
     }

     *strOut = '\0';
 }

 void getValue(char * keyAndValue, char * key, char * value){

     char *p = keyAndValue;

     p = strstr(keyAndValue, key);
     if(p == NULL){
         printf("没有key\n");
         return ;
     }

     p += strlen(key);
     trim(p, value);

     p = strstr(value, "=");
     if(p == NULL){
         printf("没有=\n");
         return;
     }
     p+= strlen("=");
     trim(p, value);

     p = strstr(value, "=");
     if(p != NULL){
         printf("多余的=\n");
         return;
     }
     p = value;
     trim(p, value);

 }

测试:

 void main(){

     char *keyAndValue = " key1 = kkkki";

     char *key = "key1";

     char value[] = {};

     getValue(keyAndValue, key, value);

     printf("value = *%s*\n", value);
     system("pause");
 }