Function scanf_get_hex

examples/stdlib.c:4364–4388

}

static __attribute__((__noinline__)) bool scanf_get_hex(
    struct scanf_stream_s *in, size_t *width, uint64_t *p, bool *r)
{
    char c = scanf_get_char_n(in, width);
    if (!isxdigit(c))
    {
        scanf_unget_char_n(c, in, width);
        return false;
    }
    uint64_t i = 0;
    do
    {
        i *= 16;
        uint64_t d = (c >= '0' && c <= '9'? c - '0':
                      c >= 'a' && c <= 'f'? 10 + c - 'a':
                      c >= 'A' && c <= 'F'? 10 + c - 'A': 0);
        if (UINT64_MAX - i < d)
            *r = true;
        i = (UINT64_MAX - i < d? UINT64_MAX: i + d);
    }
    while (isxdigit(c = scanf_get_char_n(in, width)));
    scanf_unget_char_n(c, in, width);
    *p = i;
    return true;
}

static __attribute__((__noinline__)) bool scanf_get_num(
    struct scanf_stream_s *in, size_t width, unsigned flags, void *ptr)