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carraysstringmemmove

Remove first few characters from a string

I need to remove the first 3 characters from an array without any libraries. How would I go about doing this? I know that I can use memmove but I'm working on a system without the standard library, also memmove is for pointers. With memmove I can do this:

void chopN(char *str, size_t n)
{
    assert(n != 0 && str != 0);
    size_t len = strlen(str);
    if (n > len)
        return;  // Or: n = len;
    memmove(str, str+n, len - n + 1);
}

But could I remove characters from an array without memmove or any other standard library functions?

Solution

  • As long as you know the string is at least 3 characters long, you can simply use str + 3.