@BEGIN_FROM_4_14_0@
include In_channel
@END_FROM_4_14_0@
@BEGIN_BEFORE_5_2_0@
(*
let max_buffer_size = 0x1000000

let input_and_copy_to_bigarray channel buffer tgt pos len =
  let read = input channel buffer 0 len in
  for i = 0 to read - 1 do
    Bigarray.Array1.unsafe_set tgt (pos + i) (int_of_char (Bytes.unsafe_get buffer i))
  done;
  read

let rec input_and_copy_to_bigarray_loop channel buffer tgt pos len already_read =
  let buffer_length = Bytes.length buffer in
  if buffer_length < len then
    begin
      let read =
        input_and_copy_to_bigarray channel buffer tgt pos buffer_length in
      let already_read = already_read + read in
      if read = buffer_length then
        input_and_copy_to_bigarray_loop channel buffer tgt (pos + read)
          (len - read) already_read
      else
        already_read
    end
  else
    begin
      let read = input_and_copy_to_bigarray channel buffer tgt pos len in
      already_read + read
    end

let input_bigarray channel tgt pos len =
  if len < 0 || pos + len >= Bigarray.Array1.dim tgt then
    invalid_arg "input_bigarray";
  let buffer_size = min max_buffer_size len in
  let buffer = Bytes.create buffer_size in
  input_and_copy_to_bigarray_loop channel buffer tgt pos len 0


let really_input_bigarray channel tgt pos len =
  if len < 0 || pos + len >= Bigarray.Array1.dim tgt then
    invalid_arg "input_bigarray";
  let buffer_size = min max_buffer_size len in
  let buffer = Bytes.create buffer_size in
  let rec loop len =
    let read = input_and_copy_to_bigarray_loop channel buffer tgt pos len 0 in
    if read = 0 then
      None
    else if read < len then
      Some ()
    else
      loop (len - read) in
  loop len
*)
let input_bigarray _channel _tgt _pos _len =
  failwith "input_bigarray"

let really_input_bigarray _channel _tgt _pos _len =
  failwith "really_input_bigarray"

let is_binary_mode _channel =
  failwith "is_binary_mode"
@END_BEFORE_5_2_0@
@BEGIN_BEFORE_4_14_0@
type t = in_channel

type open_flag = Pervasives.open_flag =
    Open_rdonly
  | Open_wronly
  | Open_append
  | Open_creat
  | Open_trunc
  | Open_excl
  | Open_binary
  | Open_text
  | Open_nonblock

let stdin = stdin

let open_bin = open_in_bin

let open_text = open_in

let open_gen = open_in_gen

let read_and_close channel f =
  Stdcompat__fun.protect
    ~finally:(fun () -> close_in_noerr channel)
    (fun () -> f channel)

let with_open_bin filename f =
  read_and_close (open_bin filename) f

let with_open_text filename f =
  read_and_close (open_text filename) f

let with_open_gen flags perm filename f =
  read_and_close (open_gen flags perm filename) f

let seek = LargeFile.seek_in

let pos = LargeFile.pos_in

let length = LargeFile.in_channel_length

let close = close_in

let close_noerr = close_in_noerr

let input_char ic =
  try
    Some (input_char ic)
  with End_of_file ->
    None

let input_byte ic =
  try
    Some (input_byte ic)
  with End_of_file ->
    None

let input_line ic =
  try
    Some (input_line ic)
  with End_of_file ->
    None

let input = input

let really_input ic buf pos len =
  try
    really_input ic buf pos len;
    Some ()
  with End_of_file ->
    None

let really_input_string ic len =
  try
    Some (Stdcompat__pervasives.really_input_string ic len)
  with End_of_file ->
    None

let set_binary_mode = set_binary_mode_in

let rec add_channel_to_the_end ~chunk_size buffer channel =
  if
    try
      Stdcompat__buffer.add_channel buffer channel chunk_size;
      true
    with End_of_file ->
      false
  then
    add_channel_to_the_end ~chunk_size buffer channel

let input_all channel =
  let chunk_size = 65536 in
  let buffer_size =
    try
      in_channel_length channel - pos_in channel
    with Sys_error _ ->
      -1 in
  let buffer = Buffer.create buffer_size in
  add_channel_to_the_end ~chunk_size buffer channel;
  Buffer.contents buffer

@END_BEFORE_4_14_0@

@BEGIN_BEFORE_5_1_0@
let rec fold_lines f acc ic =
  match input_line ic with
  | None -> acc
  | Some line -> fold_lines f (f acc line) ic

let input_lines ic =
  List.rev (fold_lines (fun acc line -> line :: acc) [] ic)

let isatty _ic =
  failwith "not implemented"
@END_BEFORE_5_1_0@