Question

I’m just learn about memory dynamic, and did experiment, but still get stuck. already search some around, but didn’t give any result.

This is my simple code :

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

    typedef struct kata kata;
    struct kata {
        char string[256];
    };

void load(kata **data)
{
        int len = 0;

        while( len < 5 ) {


            (*data) = (kata *) realloc ((*data), (len + 1) * sizeof(kata));
            printf("copy A - %d\n", len);

            strcpy(data[len]->string, "A");
            len++;
        }
        getch();
}

int main() {    
    kata *data = NULL;

    load(&data);

}

and my question, why it’s always segmentation fault (at 3) when i debug it ?

thanks a lot for your advice

EDIT :

Still don’t know why the error occurs, but i’ve found the solution just now..

just modify data[len]->string to (*data)[len].string

any idea, why we call data[len]->string occur some random segfault ?

Answer 1

data[len]->string should be (*data)[len]->string (*data)[len].string