How to get the real and total length of char * (char array)?

Question

For a char [], I can easily get its length by:

char a[] = \"aaaaa\";
int length = sizeof(a)/sizeof(char); // length=6

However,

Answer 1

Legit question. I personally think people confuse pointers with arrays as a result of character pointers (char*), which serve almost the same purpose as character arrays (char __[X]). This means that pointers and arrays are not the same, so pointers of course don't contain a specific size, only an address if I could say so. But nonetheless you can try something similar to strlen.

int ssize(const char* s)
{
    for (int i = 0; ; i++)
        if (s[i] == 0)
            return i;

    return 0;
}