306 lines
9.7 KiB
OCaml
306 lines
9.7 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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type 'a option = None | Some of 'a
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(* Exceptions *)
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external raise : exn -> 'a = "%raise"
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let failwith s = raise(Failure s)
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let invalid_arg s = raise(Invalid_argument s)
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exception Exit
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(* Comparisons *)
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external (=) : 'a -> 'a -> bool = "%equal"
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external (<>) : 'a -> 'a -> bool = "%notequal"
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external (<) : 'a -> 'a -> bool = "%lessthan"
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external (>) : 'a -> 'a -> bool = "%greaterthan"
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external (<=) : 'a -> 'a -> bool = "%lessequal"
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external (>=) : 'a -> 'a -> bool = "%greaterequal"
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external compare: 'a -> 'a -> int = "compare" "noalloc"
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let min x y = if x <= y then x else y
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let max x y = if x >= y then x else y
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external (==) : 'a -> 'a -> bool = "%eq"
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external (!=) : 'a -> 'a -> bool = "%noteq"
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(* Boolean operations *)
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external not : bool -> bool = "%boolnot"
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external (&) : bool -> bool -> bool = "%sequand"
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external (&&) : bool -> bool -> bool = "%sequand"
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external (or) : bool -> bool -> bool = "%sequor"
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external (||) : bool -> bool -> bool = "%sequor"
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(* Integer operations *)
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external (~-) : int -> int = "%negint"
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external succ : int -> int = "%succint"
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external pred : int -> int = "%predint"
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external (+) : int -> int -> int = "%addint"
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external (-) : int -> int -> int = "%subint"
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external ( * ) : int -> int -> int = "%mulint"
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external (/) : int -> int -> int = "%divint"
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external (mod) : int -> int -> int = "%modint"
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let abs x = if x >= 0 then x else -x
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external (land) : int -> int -> int = "%andint"
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external (lor) : int -> int -> int = "%orint"
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external (lxor) : int -> int -> int = "%xorint"
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let lnot x = x lxor (-1)
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external (lsl) : int -> int -> int = "%lslint"
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external (lsr) : int -> int -> int = "%lsrint"
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external (asr) : int -> int -> int = "%asrint"
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let min_int = 1 lsl (if 1 lsl 31 = 0 then 30 else 62)
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let max_int = min_int - 1
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(* Floating-point operations *)
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external (~-.) : float -> float = "%negfloat"
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external (+.) : float -> float -> float = "%addfloat"
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external (-.) : float -> float -> float = "%subfloat"
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external ( *. ) : float -> float -> float = "%mulfloat"
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external (/.) : float -> float -> float = "%divfloat"
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external ( ** ) : float -> float -> float = "power_float" "pow" "float"
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external exp : float -> float = "exp_float" "exp" "float"
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external log : float -> float = "log_float" "log" "float"
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external sqrt : float -> float = "sqrt_float" "sqrt" "float"
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external sin : float -> float = "sin_float" "sin" "float"
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external cos : float -> float = "cos_float" "cos" "float"
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external tan : float -> float = "tan_float" "tan" "float"
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external asin : float -> float = "asin_float" "asin" "float"
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external acos : float -> float = "acos_float" "acos" "float"
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external atan : float -> float = "atan_float" "atan" "float"
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external atan2 : float -> float -> float = "atan2_float" "atan2" "float"
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external abs_float : float -> float = "%absfloat"
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external float : int -> float = "%floatofint"
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external truncate : float -> int = "%intoffloat"
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(* String operations -- more in module String *)
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external string_length : string -> int = "ml_string_length"
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external string_create: int -> string = "create_string"
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external string_blit : string -> int -> string -> int -> int -> unit
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= "blit_string"
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let (^) s1 s2 =
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let l1 = string_length s1 and l2 = string_length s2 in
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let s = string_create (l1 + l2) in
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string_blit s1 0 s 0 l1;
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string_blit s2 0 s l1 l2;
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s
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(* Pair operations *)
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external fst : 'a * 'b -> 'a = "%field0"
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external snd : 'a * 'b -> 'b = "%field1"
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(* String conversion functions *)
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external format_int: string -> int -> string = "format_int"
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external format_float: string -> float -> string = "format_float"
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let string_of_bool b =
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if b then "true" else "false"
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let string_of_int n =
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format_int "%d" n
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external int_of_string : string -> int = "int_of_string"
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let string_of_float f =
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format_float "%.12g" f
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external float_of_string : string -> float = "float_of_string"
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(* List operations -- more in module List *)
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let rec (@) l1 l2 =
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match l1 with
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[] -> l2
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| hd :: tl -> hd :: (tl @ l2)
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(* I/O operations *)
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type in_channel
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type out_channel
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external open_descriptor_out: int -> out_channel = "open_descriptor"
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external open_descriptor_in: int -> in_channel = "open_descriptor"
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let stdin = open_descriptor_in 0
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let stdout = open_descriptor_out 1
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let stderr = open_descriptor_out 2
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(* General output functions *)
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type open_flag =
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Open_rdonly | Open_wronly | Open_append
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| Open_creat | Open_trunc | Open_excl
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| Open_binary | Open_text | Open_nonblock
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external open_desc: string -> open_flag list -> int -> int = "sys_open"
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let open_out_gen mode perm name =
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open_descriptor_out(open_desc name mode perm)
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let open_out name =
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open_out_gen [Open_wronly; Open_creat; Open_trunc; Open_text] 0o666 name
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let open_out_bin name =
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open_out_gen [Open_wronly; Open_creat; Open_trunc; Open_binary] 0o666 name
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external flush : out_channel -> unit = "flush"
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external unsafe_output : out_channel -> string -> int -> int -> unit = "output"
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external output_char : out_channel -> char -> unit = "output_char"
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let output_string oc s =
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unsafe_output oc s 0 (string_length s)
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let output oc s ofs len =
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if ofs < 0 or ofs + len > string_length s
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then invalid_arg "output"
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else unsafe_output oc s ofs len
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external output_byte : out_channel -> int -> unit = "output_char"
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external output_binary_int : out_channel -> int -> unit = "output_int"
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external output_value : out_channel -> 'a -> unit = "output_value"
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external seek_out : out_channel -> int -> unit = "seek_out"
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external pos_out : out_channel -> int = "pos_out"
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external out_channel_length : out_channel -> int = "channel_size"
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external close_out_channel : out_channel -> unit = "close_channel"
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let close_out oc = flush oc; close_out_channel oc
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(* General input functions *)
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let open_in_gen mode perm name =
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open_descriptor_in(open_desc name mode perm)
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let open_in name =
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open_in_gen [Open_rdonly; Open_text] 0 name
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let open_in_bin name =
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open_in_gen [Open_rdonly; Open_binary] 0 name
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external input_char : in_channel -> char = "input_char"
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external unsafe_input : in_channel -> string -> int -> int -> int = "input"
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let input ic s ofs len =
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if ofs < 0 or ofs + len > string_length s
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then invalid_arg "input"
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else unsafe_input ic s ofs len
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let rec unsafe_really_input ic s ofs len =
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if len <= 0 then () else begin
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let r = unsafe_input ic s ofs len in
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if r = 0
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then raise End_of_file
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else unsafe_really_input ic s (ofs+r) (len-r)
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end
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let really_input ic s ofs len =
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if ofs < 0 or ofs + len > string_length s
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then invalid_arg "really_input"
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else unsafe_really_input ic s ofs len
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external input_scan_line : in_channel -> int = "input_scan_line"
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let rec input_line chan =
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let n = input_scan_line chan in
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if n = 0 then (* n = 0: we are at EOF *)
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raise End_of_file
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else if n > 0 then begin (* n > 0: newline found in buffer *)
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let res = string_create (n-1) in
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unsafe_input chan res 0 (n-1);
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input_char chan; (* skip the newline *)
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res
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end else begin (* n < 0: newline not found *)
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let beg = string_create (-n) in
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unsafe_input chan beg 0 (-n);
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try
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beg ^ input_line chan
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with End_of_file ->
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beg
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end
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external input_byte : in_channel -> int = "input_char"
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external input_binary_int : in_channel -> int = "input_int"
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external input_value : in_channel -> 'a = "input_value"
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external seek_in : in_channel -> int -> unit = "seek_in"
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external pos_in : in_channel -> int = "pos_in"
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external in_channel_length : in_channel -> int = "channel_size"
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external close_in : in_channel -> unit = "close_channel"
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(* Output functions on standard output *)
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let print_char c = output_char stdout c
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let print_string s = output_string stdout s
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let print_int i = output_string stdout (string_of_int i)
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let print_float f = output_string stdout (string_of_float f)
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let print_endline s = output_string stdout s; output_char stdout '\n'
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let print_newline () = output_char stdout '\n'; flush stdout
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(* Output functions on standard error *)
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let prerr_char c = output_char stderr c
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let prerr_string s = output_string stderr s
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let prerr_int i = output_string stderr (string_of_int i)
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let prerr_float f = output_string stderr (string_of_float f)
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let prerr_endline s =
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output_string stderr s; output_char stderr '\n'; flush stderr
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let prerr_newline () = output_char stderr '\n'; flush stderr
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(* Input functions on standard input *)
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let read_line () = flush stdout; input_line stdin
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let read_int () = int_of_string(read_line())
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let read_float () = float_of_string(read_line())
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(* References *)
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type 'a ref = { mutable contents: 'a }
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external ref: 'a -> 'a ref = "%makemutable"
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external (!): 'a ref -> 'a = "%field0"
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external (:=): 'a ref -> 'a -> unit = "%setfield0"
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external incr: int ref -> unit = "%incr"
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external decr: int ref -> unit = "%decr"
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(* Miscellaneous *)
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external sys_exit : int -> 'a = "sys_exit"
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let exit_function = ref (fun () -> flush stdout; flush stderr)
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let at_exit f =
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let g = !exit_function in
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exit_function := (fun () -> f(); g())
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let do_at_exit () = (!exit_function) ()
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let exit retcode =
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do_at_exit ();
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sys_exit retcode
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