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From gpc-owner+M8228@gnu.de Mon Feb 15 18:27:09 2010
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Date: Mon, 15 Feb 2010 12:25:50 -0500
From: Kevan Hashemi <hashemi@brandeis.edu>
Organization: Brandeis University
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Subject: Long String Generation
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Dear GPC Users,

I use long strings to pass numerical data into and out of a shared 
library I compile from Pascal. Right now, I generate a long string of 
numbers like this.

program string_demo;

var
   long_string:string(100000);
   i:integer;

begin
   long_string:='';
   for i:=1 to 10000 do
     writestr(long_string,long_string,i:1,' ');
end.

Clearly, this is inefficient. It takes 200 ms on my machine. If I use an 
array of characters instead of a string, and append each new entry to 
the array, execution time drops to 10 ms.

I can't see a way of using GPC's writestr, concat, or trim functions to 
accelerate my string generation. I can't alter the long_string.length 
field directly. If I could fill up the string with spaces first, I could 
use the string as an array, then trim the spaces off the end. But 
filling up the string with spaces requires multiple calls to writestr, 
so I'm back where I started.

It seems to me that I'm missing an obvious solution to my problem, and I 
thought you might point it out to me.

Yours, Kevan



-- 
Kevan Hashemi, Electrical Engineer
Physics Department, Brandeis University
http://alignment.hep.brandeis.edu/

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