4gl string parsing

I need to parse a comma separated list of strings
in 4gl. If there is a number less than 290000 in the
list i need to return a true value, otherwise false.
I have something like:

let topix = "300000,310010,420011,650934,280000"
let top_loop = 0

while (top_loop < length(topic))
if (topix[top_loop, top_loop + 6] < 290000) then
return 1
end if
end while
return 0

On Jan 26, 12:01 pm, monkeys paw wrote:
> I need to parse a comma separated list of strings
> in 4gl. If there is a number less than 290000 in the
> list i need to return a true value, otherwise false.
> I have something like:
>
> let topix = "300000,310010,420011,650934,280000"
> let top_loop = 0
>
>   while (top_loop < length(topic))
>         if (topix[top_loop, top_loop + 6] < 290000) then
>             return 1
>         end if
>   end while
>   return 0

Converting my prior suggestion into a stored procedure...

This will let you do something like

execute function tst_string(100,"400,800,-1,50000");

--------------------------------------------------------------------------------------------

create function tst_string(maxnum int, str lvarchar) returns int
define tnum int;
define len int;
define sign int;
define sub int;
define tchar char(1);

let len = length(trim(str));
let sub = 1;

while sub < len
let tnum = 0;
let sign = 1;
let tchar = substring(str from sub for 1);
if tchar = '-' then
let sign = -1;
let sub = sub + 1;
let tchar = substring(str from sub for 1);
end if;

while ((sub < len) and (tchar != ','))
if (tchar != ',') then
let tnum = (tnum * 10) || tchar;
end if;
let sub = sub + 1;
let tchar = substring(str from sub for 1);
end while;
let sub = sub + 1;
if (tnum * sign) < maxnum then
return 1;
end if;
end while;

return 0;
end function;