How to assign the return of Strtok to an array of strings?

Question

Guys, I was testing the function strtok only it is giving this problem of "Segmentation failure (recorded core image)".

Before I tried to do strPtr [i] = strtok (str1, str2); but I made that mistake:

"error: assignment to Expression with array type error"

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

int main (void)
{
char str1[] = "Teste de funcao que separa string em tokens";
char str2[] = " ";
char strPtr[10][10];


char *aux;
int i;
aux = strtok (str1, str2);
strcpy (strPtr[0], aux);
for (i = 1; strPtr[i] != NULL; i++)
{
    aux = strtok (NULL, str2);
    strcpy (strPtr[i], aux);
}

for (i = 0; i < 10; i++)
{
    puts(strPtr[i]);
}

return 0;

}

Answer 1

According to C Standard Library documentation, Section 7.1.4 (translation made by me)

Each of the following statements applies unless it is explicitly stated otherwise in the detailed descriptions that If an argument for a function has an invalid value (as [...] a null pointer [...]) [...] the behavior is undefined.

Therefore, when aux hold the value NULL, you will encounter an undefined behavior. This will happen because your repeat loop does not check such a situation.

I suggest you modify your loop of repetition that feeds your array of strings. Something like

for (char *aux = strtok(str1, str2); aux != NULL; aux = strtok(NULL, str2))
{
  ...
}

See working here.