C语言-字符串分割函数 strtok、strtok

C语言-字符串分割函数 strtok、strtok_r

一、函数介绍

函数名

strtok, strtok_r - extract tokens from strings
//从字符串中提取标记

头文件

 #include <string.h>

文件原型

char *strtok(char *str, const char *delim);char *strtok_r(char *str, const char *delim, char **saveptr);

二、测试代码

官方代码：

#include <stdio.h>#include <stdlib.h>#include <string.h>int main(int argc, char *argv[])
{char *str1, *str2, *token, *subtoken;char *saveptr1, *saveptr2;int j;if (argc != 4) {fprintf(stderr, "Usage: %s string delim subdelim\n",argv[0]);exit(EXIT_FAILURE);}for (j = 1, str1 = argv[1]; ; j++, str1 = NULL) {token = strtok_r(str1, argv[2], &saveptr1);if (token == NULL)break;printf("%d: %s\n", j, token);for (str2 = token; ; str2 = NULL) {subtoken = strtok_r(str2, argv[3], &saveptr2);if (subtoken == NULL)break;printf(" --> %s\n", subtoken);}}exit(EXIT_SUCCESS);
}

编译输出可执行文件a.out，输入指令

./a.out 'a/bbb///cc;xxx:yyy:' ':;' '/'

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自测代码

#include <string.h> 
#include <stdio.h> int main(void) 
{ char input[16] = "abc,d,D,E"; char *p; // strtok places a NULL terminator in front of the token, if found  p = strtok(input, ","); if (p)   printf("%s\n", p); // A second call to strtok using a NULL as the first parameter returns a pointer to the character following the token  //p = strtok(NULL, ","); //if (p)   printf("%s\n", p); //p = strtok(NULL, ","); //if (p)   printf("%s\n", p); //p = strtok(NULL, ","); //if (p)   printf("%s\n", p); while(p = strtok(NULL, ",")){printf("%s\n", p);} return 0; 
}

测试结果：
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