Question

I have a function

void add_car(char *car) {
    park.buffer[park.size] = car;
    park.size ++;
}

car is a string like “XYZ”. Atm, It seems to assign the carpark buffer array element to an address. Thus if I fill the array with 10 cars, I get back 10 cars, but each of them is the latest one, since the address of car was overwritten. How do I fill my carpark.buffer with the actual value of a car.

Total mindblank atm

Answer 1

Assuming park.buffer is an array of char*, you may want to use

park.buffer[park.size] = strdup(car);

Note that, inevitably, this makes a copy (indispensable, if you don’t want further changes to car to affect park.buffer!) owned by park (meaning that, when done, you’ll have to free it from there, because strdup implicitly does a malloc [and a strcpy too of course;-)]).

BTW, you’ll need to #include <string.h> at the top of your file (if you’re not already doing so) in order to use strdup.