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(*
HLins: insert http-links into HTML documents.
See http://www.lri.fr/~treinen/hlins
Copyright (C) 1999 Ralf Treinen <treinen@lri.fr>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
open String;;
type buffer =
{ buf: string; (* stores the contents *)
len: int; (* length of buf *)
mutable sta: int; (* position of the first char *)
mutable uno: int (* first unoccupied position *)
}
;;
let fresh n =
{ buf = create n;
len = n;
sta = 0;
uno = 0
};;
let is_empty {sta=s;uno=e} = ( s = e );;
let addc b c =
b.buf.[b.uno] <- c;
b.uno <- (b.uno + 1) mod b.len
;;
let getc b =
let res = b.buf.[b.sta]
in
b.sta <- (b.sta + 1) mod b.len;
res
;;
let gets b n =
let oldsta = b.sta
and oldstan= b.sta+n
in
if oldstan < b.len
then
begin
b.sta <- oldstan;
sub b.buf oldsta n
end
else
begin
b.sta <- oldstan mod b.len;
(sub b.buf oldsta (b.len - oldsta)) ^
(sub b.buf 0 b.sta)
end
;;
let getall b =
let olduno = b.uno
in
begin
b.uno <- b.sta;
if olduno >= b.sta
then (String.sub b.buf b.sta (olduno-b.sta))
else (String.sub b.buf b.sta (b.len-b.sta))^
(String.sub b.buf 0 olduno);
end
;;
let push b s =
let l = String.length s
in
if l <= b.sta
then
begin
String.blit s 0 b.buf (b.sta-l) l;
b.sta <- b.sta - l
end
else
begin
String.blit s (l-b.sta) b.buf 0 b.sta;
String.blit s 0 b.buf (b.len-l+b.sta) (l-b.sta);
b.sta <- b.len-l+b.sta
end
;;
|
