str函数

strstr

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

int main( int argc, char *argv[] )
{
    int rc=0;
    char *str = "http://www.bbb.com";
    char *p = strstr(str,"www");             结果：www.bbb.com
    char *p1 = strchr(str, '/');              // 结果：//www.bbb.com
    printf("%s p:%s %u
", str,p, __LINE__);
    return rc;
}

结果：

$ gcc -o str.o str.c
$ ./str.o
$ http://www.bbb.com p:www.bbb.com 9

字符串后向匹配

int main( int argc, char *argv[] )
{
    int rc=0;
    char *visit = "http://www.bbb.com/eee";
    char *p;
    char v_http[32],url[32];
    if(!strncmp(visit,"http://",7)){
       strcpy (v_http, visit+7);
       p = strchr(v_http, '/');
       if(p){
         strncpy (url, v_http, p - v_http);
       }
       printf("1 url %s p:%s v_http %s %lu
", url,p, v_http,p - visit);

    }else{
       strncpy (v_http, visit+4, p - visit);
       printf("2 visit %s p:%s str1 %s %lu
", visit,p, v_http,p - visit);
    }
    char *list = "bbb.com";
    rc = strncmp(list, url, strlen(list));
    char *p1 = strstr(url,list);
    printf("3 visit %s list %s rc %d %s
", visit,list,rc,p1);
    return rc;
}

# gcc -o str2.o str2.c
# ./str2.o
1 url www.bbb.com p:/eee v_http www.bbb.com/eee 140731426069911
3 visit http://www.bbb.com/eee list bbb.com rc -21 bbb.com