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Re: Check if all 256 bits are clear or set ?

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Tim Rentsch <tr.17687@z991.linuxsc.com> writes:

> Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
>
>>   i = 0;
>>   while (i < n && (unsigned char)~0U == data[i]) i++;
>>   // i >= n or data[i] != -1
>>   if (i < n)
>>        // data[i] != -1
>>        clrset ^= ALL_SET;
>>
>>   i = 0;
>>   while (i < n && 0 == data[i]) i++;
>>   // i >= n or data[i] != 0
>>   if (i < n)
>>        // data[i] != 0
>>        clrset ^= ALL_CLEAR;

For the record, not what I would write!  I was explaining a point about
loops.

> For fun:
>
>     size_t i = -1, clear = 1, set = 1;
>     unsigned char ones = -1;
>     while(  clear | set  &&  ++i < n  ){
>         clear &= data[i] == 0,  set &= data[i] == ones;
>     }
>     return  set<<1 | clear;
>

-- 
Ben.

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Check if all 256 bits are clear or set ? skybuck2000 <skybuck2000@hotmail.com> - 2021-10-28 17:47 -0700
  Re: Check if all 256 bits are clear or set ? skybuck2000 <skybuck2000@hotmail.com> - 2021-10-28 18:02 -0700
    Re: Check if all 256 bits are clear or set ? skybuck2000 <skybuck2000@hotmail.com> - 2021-10-28 18:12 -0700
      Re: Check if all 256 bits are clear or set ? skybuck2000 <skybuck2000@hotmail.com> - 2021-10-28 19:18 -0700
        Re: Check if all 256 bits are clear or set ? skybuck2000 <skybuck2000@hotmail.com> - 2021-10-29 05:16 -0700
  Re: Check if all 256 bits are clear or set ? Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2021-11-03 11:11 +1100
    Re: Check if all 256 bits are clear or set ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-03 11:50 +0000
      Re: Check if all 256 bits are clear or set ? Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2021-11-06 16:08 +1100
        Re: Check if all 256 bits are clear or set ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-06 11:02 +0000
          Re: Check if all 256 bits are clear or set ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-11-06 15:04 -0700
            Re: Check if all 256 bits are clear or set ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-06 22:06 +0000
            Re: Check if all 256 bits are clear or set ? Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2021-11-13 11:54 +1100
          Re: Check if all 256 bits are clear or set ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-11-06 15:22 -0700
            Re: Check if all 256 bits are clear or set ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-07 00:08 +0000
              Re: Check if all 256 bits are clear or set ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-11-07 08:12 -0800
        Re: Check if all 256 bits are clear or set ? skybuck2000 <skybuck2000@hotmail.com> - 2021-11-23 08:23 -0800
      Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-06 15:01 +0100
  Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-03 21:04 +0100
    Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-03 21:09 +0100
      Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-03 21:11 +0100
        Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-03 21:25 +0100
          Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-04 07:05 +0100
            Re: Check if all 256 bits are clear or set ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-04 11:37 +0000
              Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-04 17:58 +0100
                Re: Check if all 256 bits are clear or set ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-04 17:13 +0000
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-04 18:15 +0100
                Re: Check if all 256 bits are clear or set ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-11-04 17:27 +0000
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-04 18:29 +0100
                Re: Check if all 256 bits are clear or set ? scott@slp53.sl.home (Scott Lurndal) - 2021-11-04 17:28 +0000
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-05 11:56 +0100
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-05 18:20 +0100
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-05 18:32 +0100
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-04 18:13 +0100
                Re: Check if all 256 bits are clear or set ? Manfred <noname@add.invalid> - 2021-11-04 19:28 +0100
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-04 20:29 +0100
                Re: Check if all 256 bits are clear or set ? Manfred <noname@add.invalid> - 2021-11-05 02:06 +0100
                Re: Check if all 256 bits are clear or set ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-11-05 08:57 +0100
              Re: Check if all 256 bits are clear or set ? Bart <bc@freeuk.com> - 2021-11-04 18:01 +0000

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