Question

I have this struct

typedef struct
{
    int numberPipes;              // |
    int numberAmpersands;         // &
    int existsBiggerThan;         // >
    int existsLessThan;           // <
    int existsDoubleLargerThan;   // >>

} lineData;

and I run in my loop on a char array (char*), in order to find all indexes of '&' and '|' .

I don’t know how much '&' and '|' I’m going to find . Is it possible to start with two arrays (using malloc)
of size 1 and enlarge them after each iteration , only if I find another occurrence of one of them ?

Answer 1

You can do that by calling realloc.

For performance reasons, it might be better to call it not for each new element, but once in X elements, so you reduce the number of calls to malloc / realloc.