Question

int utstrlen(char* src){
    int length=0 ;
    if(isOurs(src) ==1){
        length = src - 2 * sizeof(int);
    }
    return length;
}

I got the warning C4047: ‘=’ : ‘int’ differs in levels of indirection from ‘char *’ error from line length = src - 2 * sizeof(int); can someone explain what’s wrong with it? Thank you!

Answer 1

Based upon your previous question, you want

length = *((int *)(src - 2 * sizeof(int)));

although that assumes no padding. A better way would be to use offsetof():

String *beg = (String *)(src - offsetof(struct String, ptr));
length = beg->length;

I am assuming you are using the struct from your previous question.