+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- I N T E R F A C E S . C . S T R I N G S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2000 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT 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 distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with System; use System;
-with System.Address_To_Access_Conversions;
-
-package body Interfaces.C.Strings is
-
- package Char_Access is new Address_To_Access_Conversions (char);
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- function Peek (From : chars_ptr) return char;
- pragma Inline (Peek);
- -- Given a chars_ptr value, obtain referenced character
-
- procedure Poke (Value : char; Into : chars_ptr);
- pragma Inline (Poke);
- -- Given a chars_ptr, modify referenced Character value
-
- function "+" (Left : chars_ptr; Right : size_t) return chars_ptr;
- pragma Inline ("+");
- -- Address arithmetic on chars_ptr value
-
- function Position_Of_Nul (Into : char_array) return size_t;
- -- Returns position of the first Nul in Into or Into'Last + 1 if none
-
- function C_Malloc (Size : size_t) return chars_ptr;
- pragma Import (C, C_Malloc, "__gnat_malloc");
-
- procedure C_Free (Address : chars_ptr);
- pragma Import (C, C_Free, "__gnat_free");
-
- ---------
- -- "+" --
- ---------
-
- function "+" (Left : chars_ptr; Right : size_t) return chars_ptr is
- begin
- return Left + chars_ptr (Right);
- end "+";
-
- ----------
- -- Free --
- ----------
-
- procedure Free (Item : in out chars_ptr) is
- begin
- if Item = Null_Ptr then
- return;
- end if;
-
- C_Free (Item);
- Item := Null_Ptr;
- end Free;
-
- --------------------
- -- New_Char_Array --
- --------------------
-
- function New_Char_Array (Chars : in char_array) return chars_ptr is
- Index : size_t;
- Pointer : chars_ptr;
-
- begin
- -- Get index of position of null. If Index > Chars'last,
- -- nul is absent and must be added explicitly.
-
- Index := Position_Of_Nul (Into => Chars);
- Pointer := C_Malloc ((Index - Chars'First + 1));
-
- -- If nul is present, transfer string up to and including it.
-
- if Index <= Chars'Last then
- Update (Item => Pointer,
- Offset => 0,
- Chars => Chars (Chars'First .. Index),
- Check => False);
- else
- -- If original string has no nul, transfer whole string and add
- -- terminator explicitly.
-
- Update (Item => Pointer,
- Offset => 0,
- Chars => Chars,
- Check => False);
- Poke (nul, into => Pointer + size_t '(Chars'Length));
- end if;
-
- return Pointer;
- end New_Char_Array;
-
- ----------------
- -- New_String --
- ----------------
-
- function New_String (Str : in String) return chars_ptr is
- begin
- return New_Char_Array (To_C (Str));
- end New_String;
-
- ----------
- -- Peek --
- ----------
-
- function Peek (From : chars_ptr) return char is
- use Char_Access;
- begin
- return To_Pointer (Address (To_Address (From))).all;
- end Peek;
-
- ----------
- -- Poke --
- ----------
-
- procedure Poke (Value : char; Into : chars_ptr) is
- use Char_Access;
- begin
- To_Pointer (Address (To_Address (Into))).all := Value;
- end Poke;
-
- ---------------------
- -- Position_Of_Nul --
- ---------------------
-
- function Position_Of_Nul (Into : char_array) return size_t is
- begin
- for J in Into'Range loop
- if Into (J) = nul then
- return J;
- end if;
- end loop;
-
- return Into'Last + 1;
- end Position_Of_Nul;
-
- ------------
- -- Strlen --
- ------------
-
- function Strlen (Item : in chars_ptr) return size_t is
- Item_Index : size_t := 0;
-
- begin
- if Item = Null_Ptr then
- raise Dereference_Error;
- end if;
-
- loop
- if Peek (Item + Item_Index) = nul then
- return Item_Index;
- end if;
-
- Item_Index := Item_Index + 1;
- end loop;
- end Strlen;
-
- ------------------
- -- To_Chars_Ptr --
- ------------------
-
- function To_Chars_Ptr
- (Item : in char_array_access;
- Nul_Check : in Boolean := False)
- return chars_ptr
- is
- begin
- if Item = null then
- return Null_Ptr;
- elsif Nul_Check
- and then Position_Of_Nul (Into => Item.all) > Item'Last
- then
- raise Terminator_Error;
- else
- return To_Integer (Item (Item'First)'Address);
- end if;
- end To_Chars_Ptr;
-
- ------------
- -- Update --
- ------------
-
- procedure Update
- (Item : in chars_ptr;
- Offset : in size_t;
- Chars : in char_array;
- Check : Boolean := True)
- is
- Index : chars_ptr := Item + Offset;
-
- begin
- if Check and then Offset + Chars'Length > Strlen (Item) then
- raise Update_Error;
- end if;
-
- for J in Chars'Range loop
- Poke (Chars (J), Into => Index);
- Index := Index + size_t'(1);
- end loop;
- end Update;
-
- procedure Update
- (Item : in chars_ptr;
- Offset : in size_t;
- Str : in String;
- Check : in Boolean := True)
- is
- begin
- Update (Item, Offset, To_C (Str), Check);
- end Update;
-
- -----------
- -- Value --
- -----------
-
- function Value (Item : in chars_ptr) return char_array is
- Result : char_array (0 .. Strlen (Item));
-
- begin
- if Item = Null_Ptr then
- raise Dereference_Error;
- end if;
-
- -- Note that the following loop will also copy the terminating Nul
-
- for J in Result'Range loop
- Result (J) := Peek (Item + J);
- end loop;
-
- return Result;
- end Value;
-
- function Value
- (Item : in chars_ptr;
- Length : in size_t)
- return char_array
- is
- begin
- if Item = Null_Ptr then
- raise Dereference_Error;
- end if;
-
- -- ACATS cxb3010 checks that Constraint_Error gets raised when Length
- -- is 0. Seems better to check that Length is not null before declaring
- -- an array with size_t bounds of 0 .. Length - 1 anyway.
-
- if Length = 0 then
- raise Constraint_Error;
- end if;
-
- declare
- Result : char_array (0 .. Length - 1);
-
- begin
- for J in Result'Range loop
- Result (J) := Peek (Item + J);
-
- if Result (J) = nul then
- return Result (0 .. J);
- end if;
- end loop;
-
- return Result;
- end;
- end Value;
-
- function Value (Item : in chars_ptr) return String is
- begin
- return To_Ada (Value (Item));
- end Value;
-
- -- As per AI-00177, this is equivalent to
- -- To_Ada (Value (Item, Length) & nul);
-
- function Value (Item : in chars_ptr; Length : in size_t) return String is
- Result : char_array (0 .. Length);
-
- begin
- if Item = Null_Ptr then
- raise Dereference_Error;
- end if;
-
- for J in 0 .. Length - 1 loop
- Result (J) := Peek (Item + J);
-
- if Result (J) = nul then
- return To_Ada (Result (0 .. J));
- end if;
- end loop;
-
- Result (Length) := nul;
- return To_Ada (Result);
- end Value;
-
-end Interfaces.C.Strings;
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