strstr的使用案例

#include<stdio.h>#include<stdlib.h>#include <string.h>#include <ctype.h>/*去除字符串inStr中的空格*/int trimSpace(char*inStr,char*out){char *p = inStr;int ret = 0;int i;if (p==NULL){ret = -1;return;}for (i=0;p[i]!='\0';i++){if (p[i]!=' '){*out++ = p[i];}}*out='\0';return ret;}/*在key-value字符串中根据key查找value 通过局部变量valuebuf返回*/int getkeyByValue(char*keyvaluebuf,char*keybuf,char*valuebuf){//查找key在不在//查找=//去除空格int ret = -1;char *p = keyvaluebuf;int i =0;char valuemidbuf[64];int len= strlen(keyvaluebuf);if (keyvaluebuf==NULL||keybuf==NULL||valuebuf==NULL){return -1;}p = strstr(p,keybuf);if (p == NULL){printf("key not found\n");ret = -1;return ret;}p = p + strlen(keybuf);p = strstr(p,"=");if (p == NULL){printf("= not found\n");ret = -1;return ret;}ret = trimSpace(p+1,valuebuf);if (ret == -1){return ret;}return ret;}int main(){char* keyvaluebuf = "key2 =     abcdef    ";char* key = "key2";char valuebuf[1024];int ret = 0;ret = getkeyByValue(keyvaluebuf,key,valuebuf);if (ret!=0){printf("error");}printf("valuebuf:%s\n",valuebuf);//abcdefsystem("pause");return 0;}