unit TrimStr;
{$B-}
{
File: TrimStr
Author: Bob Swart [100434,2072]
Purpose: routines for removing leading/trailing spaces from strings,
and to take parts of left/right of string (a la Basic).
Version: 2.0
LTrim() - Remove all spaces from the left side of a string
RTrim() - Remove all spaces from the right side of a string
Trim() - Remove all extraneous spaces from a string
RightStr() - Take a certain portion of the right side of a string
LeftStr() - Take a certain portion of the left side of a string
MidStr() - Take the middle portion of a string
}
interface
Const
Space = #$20;
function LTrim(Const Str: String): String;
function RTrim(Str: String): String;
function Trim(Str: String): String;
function RightStr(Const Str: String; Size: Word): String;
function LeftStr(Const Str: String; Size: Word): String;
function MidStr(Const Str: String; Size: Word): String;
implementation
function LTrim(Const Str: String): String;
var len: Byte absolute Str;
i: Integer;
begin
i := 1;
while (i <= len) and (Str[i] = Space) do Inc(i);
LTrim := Copy(Str,i,len)
end {LTrim};
function RTrim(Str: String): String;
var len: Byte absolute Str;
begin
while (Str[len] = Space) do Dec(len);
RTrim := Str
end {RTrim};
function Trim(Str: String): String;
begin
Trim := LTrim(RTrim(Str))
end {Trim};
function RightStr(Const Str: String; Size: Word): String;
var len: Byte absolute Str;
begin
if Size > len then Size := len;
RightStr := Copy(Str,len-Size+1,Size)
end {RightStr};
function LeftStr(Const Str: String; Size: Word): String;
begin
LeftStr := Copy(Str,1,Size)
end {LeftStr};
function MidStr(Const Str: String; Size: Word): String;
var len: Byte absolute Str;
begin
if Size > len then Size := len;
MidStr := Copy(Str,((len - Size) div 2)+1,Size)
end {MidStr};
end.