Конвертация строк

procedure Convert(var s:string);
{ANSI -> ASCII}
var i:integer;
begin
for i:=1 to length(s) do
if ord(s[i]) in [192..239] then s[i]:=chr(ord(s[i])-64)
else if ord(s[i]) in [240..255] then s[i]:=chr(ord(s[i])-16)
else if ord(s[i])=168 then s[i]:=chr(ord(240))
else if ord(s[i])=184 then s[i]:=chr(ord(241));
end;

procedure Convert1(var a:string);{ASCII->ANSI}
var i:integer;
begin
for i:=1 to length(a) do
if ord(a[i]) in [128..175] then a[i]:=chr(ord(a[i])+64)
else if ord(a[i]) in [224..239] then a[i]:=chr(ord(a[i])+16)
else if ord(a[i])=240 then a[i]:=chr(ord(168))
else if ord(a[i])=241 then a[i]:=chr(ord(184));
end;

procedure UpCaseRus(var s:string);{приведение к верхнему регистру русских букв}
{русские в верхний регистр}
var i:integer;
begin
for i:=1 to length(s) do
if s[i] in ['а'..'п'] then s[i]:=chr(ord(s[i])-32)
else if s[i] in ['р'..'я'] then s[i]:=chr(ord(s[i])-80)
else if s[i]='ё' then s[i]:='Ё';
end;

procedure MyUpCase(var s:string);{приведение к верхнему регистру всей строки}
var i:byte;
begin
for i:=1 to length(s) do
if s[i] in ['a'..'z'] then s[i]:=UpCase(s[i])
else if s[i] in ['а'..'п'] then s[i]:=chr(ord(s[i])-32)
else if s[i] in ['р'..'я'] then s[i]:=chr(ord(s[i])-80)
else if s[i]='ё' then s[i]:='Ё';
end;

procedure LowCase(var s:string);{приведение к нижнему регистру}
var i:byte;
begin
for i:=1 to length(s) do
if s[i] in ['A'..'Z','А'..'П'] then s[i]:=chr(ord(s[i])+32)
else if s[i] in ['Р'..'Я'] then s[i]:=chr(ord(s[i])+80)
else if s[i]='Ё'then s[i]:='ё';
end;