Function determine_ambiguities

src/options.c:6702–6736

go through all of the options and set the minmatch value based on what is needed for uniqueness of each individual option. Set a minimum of 3 characters. */

   based on what is needed for uniqueness of each individual
   option. Set a minimum of 3 characters. */
staticfn void
determine_ambiguities(void)
{
    int i, j, len, tmpneeded, needed[SIZE(allopt)];
    const char *p1, *p2;

    for (i = 0; i < SIZE(allopt) - 1; ++i) {
        needed[i] = 0;
    }

    for (i = 0; i < SIZE(allopt) - 1; ++i) {
        for (j = 0; j < SIZE(allopt) - 1; ++j) {
            if (j == i)
                continue;

            p1 = allopt[i].name; /* back to the start */
            p2 = allopt[j].name;
            tmpneeded = 1;
            while (*p1 && *p2 && lowc(*p1) == lowc(*p2)) {
                ++tmpneeded;
                ++p1;
                ++p2;
            }
            if (tmpneeded > needed[i])
                needed[i] = tmpneeded;
            if (tmpneeded > needed[j])
                needed[j] = tmpneeded;
        }
    }
    for (i = 0; i < SIZE(allopt) - 1; ++i) {
        len = Strlen(allopt[i].name);
        allopt[i].minmatch = (needed[i] < 3) ? 3
                                : (needed[i] <= len) ? needed[i] : len;
    }
}

staticfn int
length_without_val(const char *user_string, int len)