Function unicode_get_cc

deps/quickjs/libunicode.c:827–876

return the combining class of character c (between 0 and 255) */

/* return the combining class of character c (between 0 and 255) */
static int unicode_get_cc(uint32_t c)
{
    uint32_t code, n, type, cc, c1, b;
    int pos;
    const uint8_t *p;

    pos = get_index_pos(&code, c,
                        unicode_cc_index, sizeof(unicode_cc_index) / 3);
    if (pos < 0)
        return 0;
    p = unicode_cc_table + pos;
    for(;;) {
        b = *p++;
        type = b >> 6;
        n = b & 0x3f;
        if (n < 48) {
        } else if (n < 56) {
            n = (n - 48) << 8;
            n |= *p++;
            n += 48;
        } else {
            n = (n - 56) << 8;
            n |= *p++ << 8;
            n |= *p++;
            n += 48 + (1 << 11);
        }
        if (type <= 1)
            p++;
        c1 = code + n + 1;
        if (c < c1) {
            switch(type) {
            case 0:
                cc = p[-1];
                break;
            case 1:
                cc = p[-1] + c - code;
                break;
            case 2:
                cc = 0;
                break;
            default:
            case 3:
                cc = 230;
                break;
            }
            return cc;
        }
        code = c1;
    }
}

static void sort_cc(int *buf, int len)
{