misc/ustring.c

/* ==================== handle argv ==================== */

#define ustring_delete_range_p(/*UString **/ ustr, /*UChar **/ from, /*UChar **/ to) \
ustring_delete_len(ustr, from - ustr->ptr, to - from)

#define ustring_subreplace_len_p(/*UString **/ ustr, /*UChar **/ from, /*UChar **/ to, /*UChar **/ what, /*size_t*/ len) \
ustring_subreplace_len(ustr, what, len, from - ustr->ptr, to - from)

static int hexadecimal_digit(UChar c)
{
    if (c >= U_0 && c <= U_9) { // '0' .. '9'
        return (c - U_0);
    }
    if (c >= U_A && c <= U_F) { // 'A' .. 'F'
        return (c - (U_A - 10));
    }
    if (c >= U_a && c <= U_f) { // 'a' .. 'f'
        return (c - (U_a - 10));
    }

    return -1;
}