113 lines
2.9 KiB
OCaml
113 lines
2.9 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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(* Errors *)
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exception Fatal_error
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let fatal_error msg =
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prerr_string ">> Fatal error: "; prerr_endline msg; raise Fatal_error
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(* List functions *)
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let rec map_end f l1 l2 =
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match l1 with
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[] -> l2
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| hd::tl -> f hd :: map_end f tl l2
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let rec for_all2 pred l1 l2 =
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match (l1, l2) with
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([], []) -> true
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| (hd1::tl1, hd2::tl2) -> pred hd1 hd2 & for_all2 pred tl1 tl2
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| (_, _) -> false
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let rec filter pred =
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function
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[] ->
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[]
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| a::l ->
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if pred a then
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a::(filter pred l)
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else
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filter pred l
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let rec mem_assq x = function
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[] -> false
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| (a,b)::l -> a == x or mem_assq x l
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let rec replicate_list elem n =
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if n <= 0 then [] else elem :: replicate_list elem (n-1)
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let rec list_remove x = function
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[] -> []
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| hd :: tl ->
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if hd = x then tl else hd :: list_remove x tl
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(* File functions *)
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let find_in_path path name =
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if not (Filename.is_implicit name) then
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if Sys.file_exists name then name else raise Not_found
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else begin
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let rec try_dir = function
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[] -> raise Not_found
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| dir::rem ->
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let fullname = Filename.concat dir name in
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if Sys.file_exists fullname then fullname else try_dir rem
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in try_dir path
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end
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let remove_file filename =
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try
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Sys.remove filename
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with Sys_error msg ->
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()
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(* Hashtable functions *)
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let create_hashtable size init =
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let tbl = Hashtbl.create size in
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List.iter (fun (key, data) -> Hashtbl.add tbl key data) init;
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tbl
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(* File copy *)
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let copy_file ic oc =
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let buff = String.create 0x1000 in
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let rec copy () =
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let n = input ic buff 0 0x1000 in
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if n = 0 then () else (output oc buff 0 n; copy())
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in copy()
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let copy_file_chunk ic oc len =
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let buff = String.create 0x1000 in
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let rec copy n =
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if n <= 0 then () else begin
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let r = input ic buff 0 (min n 0x1000) in
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if r = 0 then raise End_of_file else (output oc buff 0 r; copy(n-r))
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end
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in copy len
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(* Integer operations *)
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let rec log2 n =
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if n <= 1 then 0 else 1 + log2(n asr 1)
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let align n a =
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if n >= 0 then (n + a - 1) land (-a) else n land (-a)
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let no_overflow_add a b = (a lxor b) lor (a lxor (lnot (a+b))) < 0
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let no_overflow_sub a b = (a lxor (lnot b)) lor (b lxor (a-b)) < 0
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