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Re: Questions about strings

From rickman <gnuarm@gmail.com>
Newsgroups comp.lang.forth
Subject Re: Questions about strings
Date 2015-10-17 11:25 -0400
Organization A noiseless patient Spider
Message-ID <mvtp55$o2q$1@dont-email.me> (permalink)
References <a094319a-c257-452a-8009-e5d55ab1cdf6@googlegroups.com>

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On 10/17/2015 9:46 AM, Chris Curl wrote:
> Assuming that the count is at the beginning of a string, is the count the same size as the characters in the string?
>
> And are the characters "wide" (16 bits), or are they 8-bit entities?
>
> In other words, to get the length of a string, would I use C@ or @?
>
> I know I could use COUNT NIP, but I want to understand what is going on behind the scenes so that my implementation behaves like others would.
>
> Perhaps I should go rogue and implement them as standard BSTRs ...
>
> http://bytecomb.com/vba-internals-string-variables-and-pointers-in-depth/

Do you read the ANS Forth spec?

"3.1.3.4 Counted strings
A counted string in memory is identified by the address (c-addr) of its 
length character.  The length character of a counted string shall 
contain a binary representation of the number of data characters, 
between zero and the implementation-defined maximum length for a counted 
string. The maximum length of a counted string shall be at least 255."

Does that answer your question?

-- 

Rick

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Thread

Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-17 06:46 -0700
  Re: Questions about strings rickman <gnuarm@gmail.com> - 2015-10-17 11:25 -0400
    Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-17 10:43 -0700
      Re: Questions about strings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-10-17 17:52 +0000
      Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-17 07:56 -1000
      Re: Questions about strings rickman <gnuarm@gmail.com> - 2015-10-17 14:07 -0400
      Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-18 12:50 +1000
  Re: Questions about strings Ron Aaron <rambamist@gmail.com> - 2015-10-17 19:30 +0300
  Re: Questions about strings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-10-17 17:10 +0000
  Re: Questions about strings Jason Damisch <jasondamisch@yahoo.com> - 2015-10-17 10:41 -0700
    Re: Questions about strings foxaudioresearch@gmail.com - 2015-10-17 21:41 -0700
    Re: Questions about strings Johan Kotlinski <kotlinski@gmail.com> - 2015-10-18 15:40 -0700
      Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-18 13:41 -1000
        Re: Questions about strings Johan Kotlinski <kotlinski@gmail.com> - 2015-10-19 07:58 -0700
          Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-19 08:36 -1000
          Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-23 00:08 +1000
      Re: Questions about strings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-10-19 07:15 +0000
        Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-19 05:03 -0700
          Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-19 08:38 -1000
            Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-19 14:28 -0700
            Re: Questions about strings Alfred Singlestone <vitonis@gmail.com> - 2015-10-21 16:21 -0700
              Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-22 11:07 +1000
                Re: Questions about strings Lars Brinkhoff <lars.spam@nocrew.org> - 2015-10-27 11:29 +0100
                Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-27 06:14 -0700
                Re: Questions about strings Lars Brinkhoff <lars.spam@nocrew.org> - 2015-10-27 15:04 +0100
                Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-27 07:01 -0700
                Re: Questions about strings Lars Brinkhoff <lars.spam@nocrew.org> - 2015-10-27 15:04 +0100
                Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-27 14:26 -0700
                Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-27 11:45 -1000
                Re: Questions about strings Lars Brinkhoff <lars.spam@nocrew.org> - 2015-10-28 07:43 +0100
        Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-19 23:25 +1000
      Re: Questions about strings rickman <gnuarm@gmail.com> - 2015-10-20 14:47 -0400
        Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-20 09:48 -1000
          Re: Questions about strings rickman <gnuarm@gmail.com> - 2015-10-20 23:25 -0400
            Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-21 15:11 +1000
              Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-22 11:21 +1000
                Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-21 18:31 -1000
                Re: Questions about strings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-10-22 05:51 +0000
                Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-24 12:44 +1000
                Re: Questions about strings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-10-25 10:17 +0000
                Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-26 15:14 +1100
                Re: Questions about strings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-10-26 11:20 +0000
                Re: Questions about strings "HAA" <someone@microsoft.com> - 2015-10-31 00:20 +1100
                Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-30 19:06 -1000
                Re: Questions about strings Paul Rubin <no.email@nospam.invalid> - 2015-10-30 23:27 -0700
                Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-30 21:28 -1000
                Re: Questions about strings Paul Rubin <no.email@nospam.invalid> - 2015-10-31 00:37 -0700
                Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-30 21:48 -1000
          Re: Questions about strings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2015-10-21 06:10 +0000
  Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-31 10:48 -0700
    Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-31 09:57 -1000
      Re: Questions about strings Chris Curl <ccurl609@gmail.com> - 2015-10-31 13:34 -0700
        Re: Questions about strings "Elizabeth D. Rather" <erather@forth.com> - 2015-10-31 12:06 -1000
    Re: Questions about strings "Rod Pemberton" <boo@fasdfrewar.cdm> - 2015-11-02 02:34 -0500

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