1 files changed, 77 insertions, 0 deletions
diff --git a/stdlib/buffer.ml b/stdlib/buffer.ml
new file mode 100644
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+++ b/stdlib/buffer.ml
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+(***********************************************************************)
+(*                                                                     *)
+(*                           Objective Caml                            *)
+(*                                                                     *)
+(*   Pierre Weis and Xavier Leroy, projet Cristal, INRIA Rocquencourt  *)
+(*                                                                     *)
+(*  Copyright 1999 Institut National de Recherche en Informatique et   *)
+(*  en Automatique.  All rights reserved.  This file is distributed    *)
+(*  under the terms of the GNU Library General Public License, with    *)
+(*  the special exception on linking described in file ../LICENSE.     *)
+(*                                                                     *)
+(***********************************************************************)
+
+(* Extensible buffers *)
+
+type t =
+ {mutable buffer : string;
+  mutable position : int;
+  mutable length : int;
+  initial_buffer : string}
+
+let create n =
+ let n = if n < 1 then 1 else n in
+ let n = if n > Sys.max_string_length then Sys.max_string_length else n in
+ let s = String.create n in
+ {buffer = s; position = 0; length = n; initial_buffer = s}
+
+let contents b = String.sub b.buffer 0 b.position
+
+let length b = b.position
+
+let clear b = b.position <- 0
+
+let reset b =
+  b.position <- 0; b.buffer <- b.initial_buffer;
+  b.length <- String.length b.buffer
+
+let resize b more =
+  let len = b.length in
+  let new_len = ref len in
+  while b.position + more > !new_len do new_len := 2 * !new_len done;
+  let new_buffer = String.create !new_len in
+  String.blit b.buffer 0 new_buffer 0 b.position;
+  b.buffer <- new_buffer;
+  b.length <- !new_len
+
+let add_char b c =
+  let pos = b.position in
+  if pos >= b.length then resize b 1;
+  b.buffer.[pos] <- c;
+  b.position <- pos + 1
+
+let add_substring b s offset len =
+  if offset < 0 || len < 0 || offset + len > String.length s
+  then invalid_arg "Buffer.add_substring";
+  let new_position = b.position + len in
+  if new_position > b.length then resize b len;
+  String.blit s offset b.buffer b.position len;
+  b.position <- new_position
+
+let add_string b s =
+  let len = String.length s in
+  let new_position = b.position + len in
+  if new_position > b.length then resize b len;
+  String.blit s 0 b.buffer b.position len;
+  b.position <- new_position
+  
+let add_buffer b bs =
+  add_substring b bs.buffer 0 bs.position
+
+let add_channel b ic len =
+  if b.position + len > b.length then resize b len;
+  really_input ic b.buffer b.position len;
+  b.position <- b.position + len
+
+let output_buffer oc b =
+  output oc b.buffer 0 b.position