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From: Kevan Hashemi
Subject: Long String Generation
Date: 15 Feb 2010, 12:25:50

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

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