is there already a function similar to this in any C lib?

Question

I've been stalking this place for a while but this is my first post so please be indulgent. I've coded this function for a school project, but don't know how to name it (we have to make our own functions). Question is, does anyone know if there's a similar function in a library, just so I know how to name it ?

void function(char *str, int slen)
{
    while(*str) {
        if (slen) {
            *str = *(str + slen);
        } else {
            *str = '\0';
        }

        if (*(str + slen) == '\0') {
            slen = 0;
        }

        str++;
    }
}

What it does:

Slide an string by SLEN chars towards the beginning, filling the end with '\\0' . Example :

char *str = strdup("I want to remove 8 characters");
function(str, 8);

turns my string into "remove 8 characters.\\0\\0\\0\\0\\0\\0\\0\\0\\0"

Answer 1

You can use memcpy (or memmove if the from and to areas overlap)

and then memset

There is no one function that does both

Answer 2

If you want to pass it to a function that wouldn't be responsible for cleaning the memory later you can just give that function str+len :

printFunc(str+len);

but if you need to pass this string on without the first len chars so you can memcpy the string onto a new string and free the last one.