strstr函数的用法_c find函数返回值_strchr函数(6)

6 strsep

分解字符串

int main (void )
{

strsep - extract token from string

* SYNOPSIS

#include <string.h>

char *strsep(char **stringp, const char *delim);

* DESCRIPTION

If *stringp is NULL, the strsep() function returns NULL and does nothing else.

Otherwise, this function finds the first token in the string *stringp, where tokens

are delimited by symbols in the string delim. This token is terminated with a '\0' character (by overwriting the delimiter)

and *stringp is updated to point past the token. In case no delimiter was found,

the token is taken to be the entire string *stringp, and *stringp is made NULL.

* RETURN VALUE

The strsep() function returns a pointer to the token, that is, it returns the original value of *stringp.

* BUGS

Be cautious when using this function. If you do use it, note that:

* This function modifies its first argument.

* This function cannot be used on constant strings.

* The identity of the delimiting character is lost.

*/

 char pSrc[] =".baidu.com.cn.education.mahuateng";
    char *pStringgp = pSrc;
    
    char *pRetval = NULL;
    
    
    while( (pRetval = strsep(&pStringgp, ".")) != NULL )    

/* 个人理解：分解字符串为一组字符串, 此函数会改变字符串， 返回开始到 第一个出现 delim 的地方

并用 ‘\0’替换出现的第一个delim子字符串，如果没有 delim，则返回NULL,

此函数 比strtok好处是接受空字符串并且是线程安全的。

切割后源字符串变为第一个delim 到stringp 末尾,并过滤掉第一个delim。strchr函数strchr函数

如果stringp 为NULL,则返回NULL, */

 {   
        printf("[%s]-[%d] pStringgp = %s \n", __func__, __LINE__, pStringgp);
        printf("[%s]-[%d] pRetval = %s \n", __func__, __LINE__, pRetval);
    }

本文来自电脑杂谈，转载请注明本文网址：
http://www.pc-fly.com/a/jisuanjixue/article-29692-6.html