Re: Parsing a line into strings

[Brian Rogoff <bpr@shell5.ba.best.com>]

On 8 Jul 1998, Robert Dewar wrote:
> 
> In fact GNAT.Spitbol uses Unrestricted_Access in a pretty fundamental
> way, having nothing at all to do with downward funargs!

That sound you hear is me removing my foot from my mouth :-)

In order to do penance, I have to post Ada code. Since the original poster 
was asking for the functionality of strtok in Ada, let me take a stab at
it; note that I won't diddle the state of the string like strtok does, but 
this is pretty much it. Since the caller knows the start position its easy
to use slices to extract the "tokens". Hacked and not tested, as usual :-)

-- Brian

with Ada.Strings.Maps;
use Ada.Strings.Maps;

procedure String_Separator_Position (Input : in String ; 
                                     Separators : in Character_Set;
                                     Start : in out Integer) is 
    Pos : Integer := Start;
begin
    if Start < Input'First or Start > Input'Last then 
        return; -- or raise an exception, or whatever...
    end if;

    for I in Start .. Input'Last loop
        if Is_In(Input(I),Separators) then 
            Start := I;
            return;
        end if;
    end loop;
end String_Separator_Position;