[英]strtok() in c - segmentation fault
Everytime I try to use strtok() i get an segmentation fault. 每当我尝试使用strtok()时,都会出现分段错误。 Don't know why- I'm new to C.
不知道为什么-我是C的新手。
Here is my code: 这是我的代码:
#include "shellutils.h"
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv)
{
char input[150];
while(1) {
prompt();
fgets(input, 150, stdin);
char *fst_tkn = strtok(input, " ");
printf("%s", fst_tkn);
if(feof(stdin) != 0 || input == NULL) {
printf("Auf Bald!\n");
exit(3);
}
}
}
Thanks for your help! 谢谢你的帮助!
With regards to the code: 关于代码:
char *fst_tkn = strtok(input, " ");
printf("%s", fst_tkn);
If your input
variable is empty, or contains only spaces, then fst_tkn
will be set to NULL
. 如果
input
变量为空或仅包含空格,则fst_tkn
将设置为NULL
。 Then, when you try and print that as a string, all bets are off. 然后,当您尝试将其打印为字符串时,所有选择均关闭。
You can see that in the following code by adjusting the values tou give to input
: 您可以通过调整tou给
input
的值在以下代码中看到这一点:
#include <stdio.h>
#include <string.h>
int main (void) {
char input[] = "";
char *fst_tkn = strtok (input, " ");
printf ("fst_tkn is %s\n", (fst_tkn == NULL) ? "<<null>>" : fst_tkn);
return 0;
}
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