使用 strtok_r 时出现分段错误

问题描述

谁能解释为什么我在以下示例中遇到分段错误?

Can anyone explain why I am getting segmentation fault in the following example?

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

int main(void) {
  char *hello = "Hello World, Let me live.";
  char *tokens[50];
  strtok_r(hello, " ,", tokens);
  int i = 0;
  while(i < 5) {
    printf("%s
", tokens[i++]);
  }
}

推荐答案

试试这个:

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

int main(void) {
        char hello[] = "Hello World, Let me live."; // make this a char array not a pointer to literal.
        char *rest; // to point to the rest of the string after token extraction.
        char *token; // to point to the actual token returned.
        char *ptr = hello; // make q point to start of hello.

        // loop till strtok_r returns NULL.
        while(token = strtok_r(ptr, " ,", &rest)) {

                printf("%s
", token); // print the token returned.
                ptr = rest; // rest contains the left over part..assign it to ptr...and start tokenizing again.
        }
}
/*
Output:
Hello
World
Let
me
live.
*/

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