Case Insensitive String comp in C

Question

I have two postcodes char* that I want to compare, ignoring case. Is there a function to do this?

Or do I have to loop through each use the tolower func

Answer 1

static int ignoreCaseComp (const char *str1, const char *str2, int length)
{
    int k;
    for (k = 0; k < length; k++)
    {

        if ((str1[k] | 32) != (str2[k] | 32))
            break;
    }

    if (k != length)
        return 1;
    return 0;
}

Reference