How to check if a string starts with another string in C?

Question

Is there something like startsWith(str_a, str_b) in the standard C library?

It should take pointers to two strings that end with nullbytes, and tell me

Answer 1

I'm no expert at writing elegant code, but...

int prefix(const char *pre, const char *str)
{
    char cp;
    char cs;

    if (!*pre)
        return 1;

    while ((cp = *pre++) && (cs = *str++))
    {
        if (cp != cs)
            return 0;
    }

    if (!cs)
        return 0;

    return 1;
}