Function scanf_get_dec

examples/stdlib.c:4316–4338

}

static __attribute__((__noinline__)) bool scanf_get_dec(
    struct scanf_stream_s *in, size_t *width, uint64_t *p, bool *r)
{
    char c = scanf_get_char_n(in, width);
    if (!isdigit(c))
    {
        scanf_unget_char_n(c, in, width);
        return false;
    }
    uint64_t i = 0;
    do
    {
        i *= 10;
        uint64_t d = (c - '0');
        if (UINT64_MAX - i < d)
            *r = true;
        i = (UINT64_MAX - i < d? UINT64_MAX: i + d);
    }
    while (isdigit(c = scanf_get_char_n(in, width)));
    scanf_unget_char_n(c, in, width);
    *p = i;
    return true;
}

static __attribute__((__noinline__)) bool scanf_get_oct(
    struct scanf_stream_s *in, size_t *width, uint64_t *p, bool *r)